In the process of iron and steel smelting, if the carbon content in the molten iron is not improved well, it will affect the quality of the steel and increase the cost of smelting and casting. In order to ensure the quality of steel casting, the quality of smelting can be improved by increasing the amount of smelted pig iron, but the raw iron of pig iron is relatively high. When using a recarburizer, it is not necessary to put too much pig iron. It is possible to increase the carbon content in the molten iron.
At present, there are many materials for cast iron recarburizers on the market. In general, coal quality recarburizers, petroleum coke recarburizers, calcined petroleum cokes, graphitized petroleum coke recarburizers and artificial graphite can be used as cast iron smelting. Recarburizer used. Although these products can be used as recarburizers, you must choose the right recarburizer when you buy them. If the quality of the products to be cast is high, you need to choose artificial graphitized petroleum coke recarburizer.
If the quality of the smelting metal is not high, you can choose a lower cost recarburizer. For example, in converter smelting, when high carbon steel is used, you can use petroleum coke with a lot of impurities as a recarburizer. However, the requirements for the recarburizer for the top-blown converter steelmaking are higher than the carbon of the fixed furnace recarburizer. The ash, volatiles, sulfur, phosphorus, nitrogen and other impurities are also required to be high in content, and are required to be dry, clean, and granular. Moderately, it is necessary to choose a calcined coke recarburizer and a graphitized recarburizer.
Among them, the most used mainstream carbonizers specifications are: fixed carbon C ≥ 98%, volatile matter ≤ 1.0%, sulfur content ≤ 1%, moisture ≤ 0.5%, particle size is more than 1-5mm, this recarburizer The indicator shows the calcined petroleum coke recarburizer, which is calcined petroleum coke. In the past, in the domestic smelting industry, relatively low-end non-graphitizing recarburizers were generally used. With the improvement of product quality and upgrading, more and more enterprises using graphitized petroleum coke in China will increase carbonization of graphitized petroleum coke. The indicators of the agent are: fixed carbon C ≥ 98.5%, volatile matter ≤ 0.5%, sulfur content ≤ 0.1%, moisture ≤ 0.5%, particle size between 0-5mm.
Different types of recarburizers are used differently. In the process of selecting a recarburizing agent for steel making, the particle size should be moderate, the particle size is too fine to be easily burned, and when it is too coarse to be added, it floats on the surface of the molten steel and is not easily absorbed by the molten steel. With the development of the market, the quality requirements of steelmaking refining agents are getting higher and higher, especially the conversion from coal quality carbonizers to calcined petroleum coke recarburizers, or graphitized petroleum coke recarburizers. .
The recarburizer is a material used to increase the carbon content. The main component is carbon. There are many materials that can be used as a recarburizer. Commonly used are coke and anthracite, calcined petroleum coke, graphitized petroleum coke, and graphite (artificial graphite). , natural graphite) and mixtures made from such materials.
1. Coke and anthracite
Coke is a type of solid fuel. It is obtained by dry distillation of coal under high temperature conditions of about 1000 °C. The main component is fixed carbon, followed by ash, and contains less volatile matter and sulfur. Silver-gray, metallic luster. Hard and porous. In addition to a large amount of coke and iron non-ferrous metal smelting (metallurgical coke), coke is also used in foundry, chemical, calcium carbide and ferroalloys, and its quality requirements are different. For example, for casting coke, it is generally required to have large particle size, low porosity, high fixed carbon and low sulfur content; coking for chemical gasification is not strict with strength, but requires good reactivity, high ash melting point, and coke requirement for calcium carbide production. Try to increase the fixed carbon content.
Anthracite is a hard, dense and high-gloss coal mine. The main applications of anthracite lump coal are chemical fertilizer (nitrogen fertilizer, synthetic ammonia), ceramics, manufacturing forging and other industries; anthracite coal is mainly used in the metallurgical industry for blast furnace injection (blast furnace coal mainly includes anthracite, lean coal, lean coal and gas coal) ).
2. Calcined petroleum coke (calcined coke or calcined coke)
Calcined petroleum coke is a widely used recarburizer, which is obtained by calcining petroleum coke. Petroleum coke is a by-product of refined crude oil. Residual oil and petroleum asphalt obtained by vacuum distillation or vacuum distillation can be used as raw materials for petroleum coke, and then coke is obtained to obtain raw petroleum coke. The annual production of American petroleum coke is about 30 million T. The raw petroleum coke has high impurity content and cannot be directly used as a recarburizer. It must be calcined first.
Raw petroleum coke has spongy, needle-like, granular and fluid states.
Sponge petroleum coke is produced by delayed coking. Because of its high sulfur and metal content, it is usually used as a fuel for calcination and as a raw material for calcined petroleum coke. The calcined plum cotton coke is mainly used in the aluminum industry and as a recarburizer.
The acicular petroleum coke is obtained by a delayed coking process using a raw material having a high content of aromatic hydrocarbons and a low impurity content. This coke has a needle-like structure that is easily broken, sometimes referred to as graphite coke, and is mainly used for the manufacture of graphite electrodes after calcination.
Granular petroleum coke is a hard granule. It is a raw material with a high content of sulfur and bitumen. It is produced by delayed coking and is mainly used as a fuel.
The fluid petroleum coke is obtained by continuous coking in a fluidized bed. It is in the form of fine particles, has no directional structure, high sulfur content and low volatile content.
The burning of petroleum coke is to remove sulfur, moisture, and volatiles. The raw petroleum coke is burned at 1200 ° C - 1350 t ° C to make it substantially pure carbon.
The largest user of smoked petroleum coke is the aluminum industry, 7 which is used to make anodes for the reduction of bauxite. The United States produces smoked petroleum coke, which accounts for about 6% of cast iron enhancers.
3. Graphitized petroleum coke
Graphitized petroleum coke refers to the high-temperature graphitization of petroleum coke. Under the high temperature of 3000 °C, the carbon molecular form in the petroleum coke is changed from an irregular arrangement to a hexagonal uniform arrangement. The agent is most easily decomposed in molten iron.
Characteristics of graphitized recarburizer
1) The low-sulfur graphitization recarburizer has a high decomposition rate and a high absorption rate, and can reach more than 90%.
2) High carbon, low sulfur, low nitrogen, and extremely harmful components.
3) Adding graphite nucleus to molten steel and molten iron, more uniform and finer distribution in molten steel and molten iron, so that the performance is more excellent and stable.
4. Graphite is an allotrope of elemental carbon. Each carbon atom is connected with three other carbon atoms (multiple hexagons arranged in a honeycomb shape) to form a covalent molecule by covalent bonding. . Graphite and carbon products have excellent performance, are increasingly used, and the production capacity and benefits are growing rapidly. There are more enterprises of graphite and carbon products above the scale of China, and the concentration is low. With the rapid development of China's metallurgy, chemical, machinery, medical equipment, nuclear power, automotive, aerospace and other industries, the demand for graphite and carbon products will continue to grow in these industries, and China's graphite and carbon products industry will maintain rapid growth. . Graphite is mainly divided into natural graphite and artificial graphite.
4.1. Natural graphite
Natural graphite can be divided into two types: flake graphite and microcrystalline graphite. Microcrystalline graphite has a high ash content and is generally not used as a carbon reinforcer for cast iron. There are many varieties of flake graphite. High-carbon flake graphite needs to be extracted by chemical methods, or heated to high temperature to decompose and volatilize the oxides. This flake graphite has low yield and high price, and generally does not act as a recarburizer; low carbon scales Graphite has a high ash content and should not be used as a recarburizer; it is mainly used as a carbon reinforcer for medium carbon graphite, but it is not used in large amounts.
4.2. Artificial graphite
Among the above various recarburizing agents, the best quality is artificial graphite. The main raw material for the manufacture of artificial graphite is powdered high-quality simmered petroleum coke, in which asphalt is added as a binder, and a small amount of other auxiliary materials are added. After the various raw materials are combined, they are press-formed and then treated in a non-oxidizing atmosphere at 2500 to 3000 ° C to be graphitized. After high temperature treatment, the ash, sulfur and gas contents are greatly reduced. Due to the high price of artificial graphite products, the artificial graphite breakers commonly used in foundries are mostly cut when manufacturing graphite electrodes.
Recycled materials such as chips, used electrodes and graphite blocks to reduce production costs. In the smelting of ductile iron, in order to make the metallurgical quality of cast iron superior, the carbon-reducing agent should be the first choice of artificial graphite. For this reason, it is better to purchase scrap electrodes from nearby companies that use electric arc furnace steelmaking or electrolytic aluminum production enterprises, and crush them to the required particle size. .
180909 This week, China's recarburizer market started to work stably and trading was good. Among them, the market price of recalcurizer (common calcined coal) is lower. The main reason is that the downstream steel mills are affected by many factors such as environmental protection and trade warfare. In general, recarburizer shipments are limited, and the company is basically stable in environmental protection. Most of the inventory, the market price will decline. The market price of calcined coke recarburizer (calcined petroleum coke) was stable overall. The company said that although the price is high, the supply and demand side is relatively balanced, and the market is stable; the graphitized rebcarburizer (graphitized petroleum coke) market is raised by individual companies, and the market is out. The goods are in good condition and the production situation of the company is relatively stable.
Calcined coal recarburizer:
This week, the mainstream price of China's general calcined coal rebcarurizer market was lowered. The production in the main producing area of Ningxia is stable overall, affected by the rain, and the transportation is slightly limited. The enterprises are mostly in the process of rectification and maintenance, preparing for the acceptance at the end of September. Due to the downstream receiving, the enterprises are more or less in stock, the market In general, the overall transaction is relatively light, and the mainstream market price is down. The overall market production in North China is relatively stable, but environmental protection pressure is still not small. The overall performance of the market is generally high, mainly depending on the poor start of the downstream steel mills.
This week, the mainstream price of the calcined coke recarburizer market remained stable and the market was stable. In the northeast and north China, the production of enterprises is stable, the price of calcined coke is rising, and the cost pressure of enterprises is increasing. However, in view of the high price in the downstream market, the price intention is weak, the production enterprises are still shipping, and the mainstream prices of the market have not yet fully fluctuated.
Graphitized petroleum coke recarburizer:
This week, the market price of China's graphitized petroleum coke recarburizer was stable, and the company's price intention was strong. The main reason was the increase in cost. The crude oil price of raw materials rose in the mainstream, and the high-end operation, individual companies raised product prices. Among them, the production of individual enterprises in Henan and Xinjiang was suspended due to environmental protection, and the operating rate fell. In addition, the graphitization enterprises of anode materials in the market will start construction in the second half of the year, and the output will be released. Graphitized rebcarurizer is highly concentrated in the Inner Mongolia region. Enterprises in Jiangsu Province have normal production, good shipments and smooth exports.
Recarburizer is mainly used in steel smelting process. Due to improper ingredients or improper loading and excessive decarburization, the carbon content in steel or iron sometimes fails to meet the expected requirements. At this time, carbon is added to steel or molten iron. The relationship between recarburizer and steel is also very close. Domestic steel prices have stabilized this week. Recently, the market turnover is weak, but the recent environmental protection inspection work in Shandong is in full swing. The inventory of various steel mills has decreased, and the market price support is strong. Steel mills have obvious willingness to price, and the market price on the weekend has also risen slightly, but the mainstream temporary stability has been comprehensively considered. It is expected that the short building materials market will be operated in a multi-country volatility with a range of 50 yuan/ton.
Forecast of the market outlook: the raw material price of raw calcined coal will rebound in September due to the limited price of environmental protection acceptance enterprises, and the price of the crude calcined recarburizer will develop in a stable-up mode. The price of the calcined recarburizer and the graphitized petroleum coke recarburizer is driven by cost, and the price is stable or slightly upward.
“China (Shanghai) International Foundry Exhibition, China (Shanghai) International Casting Products Exhibition” was founded in 2005 and has been successfully held for 13 sessions. The exhibits cover castings, casting molds, foundry materials, foundry equipment and castings. Developed into one of the high-profile, high-level, most professional and most authoritative brand exhibitions in the industry. The exhibition actively responded to the call of national policies, and advocated enterprises to take an innovative and efficient green casting road, which played an active role in promoting the healthy development of industry science and nature and social harmony.
Time: November 1-3, 2018
Venue: Shanghai New International Expo Center (2345 Longyang Road)
Shanghai New International Expo Center (SNIEC) is jointly invested by Shanghai Lujiazui Exhibition Development Co., Ltd. and German Exhibition Group International Co., Ltd. (members include Hannover Messe GmbH / Düsseldorf Messe GmbH / München Messe GmbH) put up. As the first exhibition center for Sino-foreign joint ventures, Shanghai New International Expo Center has been built into one of the most successful exhibition centers in China.
East China Foundry Association
Shanghai Automobile Industry Association Automobile Foundry Branch
China Institute of Metals
Baowu Iron and Steel Group Co., Ltd.
Shanghai Metal Society
Shanghai Mechanical Engineering Society
Shanghai Huaye Exhibition Co., Ltd.
Shanghai Shenshi Exhibition Service Co., Ltd.
Shanghai Huaye Exhibition Co., Ltd.
Address: Room 402, Hujin Building, 240 Tianmu Middle Road, Shanghai
Tel: 021-6919 0370
Fax: 021-6129 4607
Exhibitor Contact: Mr. Lin Sen QQ: 1060727407
Mobile: 13524321255 (WeChat with the same number)
Visit Contact: Ms. Wang Fang QQ: 32800869
Mobile: 13162692801 (WeChat with the same number)
The 14th China (Shanghai) International Foundry Exhibition and the 14th China (Shanghai) International Casting Products Exhibition will be held on November 1-3, 2018 at Shanghai New International Expo Center (2345 Longyang Road). . At that time, 500 foundry and related companies will gather, with an exhibition area of 45,000 square meters and more than 40,000 professional visitors. This year's exhibition will invite Chinese and world foundry manufacturers, materials and equipment giants to showcase new products, new technologies and new equipment with the requirements of “internationalization, specialization and high level”, thus helping the industry's top management to fully understand the global foundry industry chain. The latest trend, while creating a one-stop shopping platform for products, materials and equipment for the audience!
The 13th China (Shanghai) International Foundry Exhibition 2017 and the 13th China (Shanghai) International Casting Products Exhibition were successfully held in Shanghai New International Expo Center, which lasted for 3 days. It has gathered 520 exhibiting companies from 20 countries and regions, attracting 32,521 professional visitors from home and abroad, 13 foreign professional purchasing groups, and successfully held more than 10 casting industry technical seminars in the same period.
1. Cast steel, cast iron, stainless steel castings, non-ferrous alloy castings, aluminum castings, copper castings, ductile castings, wear-resistant castings; (precision casting, sand casting, investment casting, lost foam casting, centrifugal casting, gravity casting, high\ Low pressure casting, special casting, etc.).
2. Automobiles, motorcycles, machine tools, ships, wind power, construction machinery, rail transit, heavy machinery, mining machinery, textile machinery, printing machinery, medical machinery, general machinery, power transmission and transformation, electronic communication, petrochemical, construction hardware Castings such as pipeline pump valves, pipe fittings, municipal engineering, urban art, etc. and aluminum/magnesium/zinc/copper alloy die castings.
◆ Foundry equipment
1. Smelting and auxiliary equipment: cupola, electric furnace, electric resistance furnace, aluminum alloy melting furnace, magnesium alloy melting furnace, vacuum melting furnace, electric arc furnace, LF/AOD/VOD refining furnace, automatic pouring machine, transfer package, automatic feeding equipment , cooling towers, etc.
2, modeling / core and auxiliary equipment: box molding equipment, box-free molding equipment, resin sand molding equipment, shell molding equipment, core making machine and core center, modeling / core gas processing equipment, resin and additive quantification Equipment, core processing equipment (retouching, coating, drilling, etc.), rapid prototyping equipment (3D printing / moldless core making).
3, sand treatment / old sand regeneration and auxiliary equipment: falling sand machine, sand mixer, sand cooling equipment, magnetic separation equipment, dust removal system, chrome ore / silica sand sorter, zircon sand / silica sand sorter, old sand regeneration Equipment, etc.
4, cleaning equipment and auxiliary equipment: throwing / shot blasting equipment, automated casting finishing grinding equipment, electrochemical cleaning equipment.
5, special casting equipment: investment casting, lost mold (real) and V method casting, metal gravity casting, centrifugal casting, low pressure casting, differential pressure casting.
6. Measurement and testing equipment: rapid analyzer for chemical composition before furnace (direct reading spectrometer, CE thermal analyzer, CS analyzer), sand detector online detector, coordinate measuring instrument, thermometer, thickness gauge, endoscope Mirror, hardness tester, non-destructive testing equipment (linear accelerator flaw detector), mechanical performance testing machine, etc.
7. Others: casting, forging, die-casting robot (manipulator), automatic control system, casting mold and tooling processing equipment, tools, measuring tools, robots and testing equipment (tools), heat treatment equipment, infiltration equipment, welding equipment, surface Treatment and painting equipment, dust removal technology and equipment, industrial air conditioning, ventilation equipment, negative pressure exhaust fans, industrial cooling fans.
8, after processing equipment: CNC lathes, machining centers, milling machines, grinding machines, drilling machines, polishing machines, sand blasting machines.
◆ Casting materials
Ferroalloy, non-ferrous metal, foundry coke, refining agent, inoculant, spheroidizing agent, creeping agent, slag removing agent, quartz sand, coated sand, chromite sand, orb sand, bentonite, coal powder, recarburizer, Casting resin, curing agent, paint, refractory for casting, silica sol, wax, insulation riser, filter, steel shot, repair paste, etc.
Shanghai Aideer Precision Casting Co., Ltd.
The exhibition is good, our company has been participating for 4 consecutive years.
Shanghai Zhongzhen Nonferrous Metal Casting Co., Ltd.
This is not the first time we have participated in the International Casting Exhibition hosted by Huaye Company. The scale of the exhibition is growing every year. The quality of the audience of each exhibition is very high, which is very helpful for us to develop new business, especially overseas business. Here, I wish the exhibition better and better!
Taicang Yajin Lans Machinery Co., Ltd.
At the beginning of the exhibition, because the gods were not beautiful, they were more worried about the number of visitors. After the launch, the visitors will be in a constant stream. The booth of our company is even more popular. The 500 documents brought by the first day will be finished. I really want to thank the organizing committee for their efforts.
Jiangsu Huaye Technology Co., Ltd.
By participating in this exhibition, we have gained important target customers.
Shiyan Well-known Industrial Development Co., Ltd.
We have participated in the Shanghai Foundry Exhibition for three consecutive years. The exhibition has received more than 20 new customers and the results are very satisfactory. The organizer's booth design and exhibitor's customer service are also in place, which is the guarantee for our successful participation. We look forward to seeing the foundry exhibition next year.
Suzhou Xiaweiyi Energy Saving Machinery Co., Ltd.
CSFE2014 brings together a large number of casting products and equipment companies to provide us with a high-quality environment to display the company's products and services, while creating a platform for communication with other well-known companies.
Huzhou Nanfeng Machinery Manufacturing Co., Ltd.
The exhibition is rich in form, and Huaye is the third time to participate in the service and enthusiasm of the organizer. I hope to continue to organize more and better target customers to come to the scene to meet with us.
Yingda Industry (Shanghai) Co., Ltd.
The exchanges and interactions with professional visitors have benefited us a lot, further understanding the needs of the industry, and making friends with friends. I wish the exhibition to become a casting exhibition with global influence as soon as possible.
Hanshan County Machinery Casting Association
This exhibition is based on the theme of environmental protection, energy conservation and emission reduction. It has forums, exhibition areas and rich and colorful, which provides a good platform for relevant industry exchanges and is conducive to the development of green environmental protection.
East China Foundry Association
The exhibition is professional and the process is clear. The communication between us and Huaye is also very smooth. While supporting the work of the association, we have also demonstrated our image and wished the foundry exhibition more and more success!
CHUNHO casting co.,Ltd(KOREA)
Congratulations to the organizers of Shanghai Foundry Exhibition - all relevant personnel of Huaye Company and all exhibitors, this is an excellent exhibition event. We are very happy to see so many companies attending the show.
Shanghai Shengdeman Casting Co., Ltd.
The effect is very good. I feel that the scene is very popular. The on-site customers are more targeted. I saw the customers I want to see and played a very good publicity effect. The green casting and energy-saving and emission reduction forum held at the same time was also very successful. Similar hopes can continue to participate.
Suzhou Zhenwu Electric Furnace Co., Ltd.
The exhibition performed well and was very satisfied with the service of the organizers. It achieved the expected goals and is looking forward to continued participation next year.
Jiangsu Lutong Furnace Co., Ltd.
As an old exhibitor, we feel that the scale of this casting exhibition is very large. The service of the organizer of the exhibition is very in place, very intimate and convenient to communicate. I hope to inform us as soon as possible to make better preparations.
Ningbo Yinzhou Qianming Casting Co., Ltd.
This year is the second time that our company has participated in the foundry exhibition. Personally, this exhibition is large in scale and professional. Through this platform, we can not only promote our products, but also let everyone know about our brand. In the future, we will also choose a larger booth to exhibit.
Zhejiang Wanfeng Technology Co., Ltd.
The three-day “casting and die-casting exhibition” has been successfully completed. As the exhibitor of this exhibition, the latest casting robot products are unveiled. The exhibition was grand in scale, and the exhibitors were highly representative. Exhibitors and visitors from all over the world showed great enthusiasm for the exhibition.
The use of recarburizers, as the name implies, is to increase the content of carbon. Its main purpose is to increase the carbon content lost during the steelmaking process. If the carbon content does not meet the expected requirements during the steelmaking process, a certain proportion is required. The recarburizer enhances the carbon content of the molten steel and smelts the ideal steel.
There are many kinds of raw materials for recarburizers, and the production process is also different. There are wood carbons, coal carbons, petroleum cokes, etc., while petroleum cokes are divided into calcined coke recarburizers and graphitized recarburizers. The current mainstream recarburizer.
The calcined petroleum coke recarburizer refers to the calcination of the raw material petroleum coke, and the temperature is controlled at 1250～1380°C. During the calcination process, the structure and element composition of the petroleum coke undergo a series of deep changes, thereby improving their physics. Chemical properties.
Why is petroleum coke calcined?
The purpose of calcination:
1. Eliminate volatiles and moisture in petroleum coke raw materials. After calcination, the volatile matter is 0.5% or less, and the water content is 0.3% or less.
The calcined volatiles and moisture represent the degree of calcination, which does not require secondary shrinkage and crack formation during calcination.
2. Improve the density and mechanical strength of petroleum coke raw materials. The true density is 2.00 g/cm3 or more.
The true density of the calcined coke affects the true density of the final product, and the mechanical strength is low. The bulk density is low, which affects the molding. The main performance is difficult to form. The height of the green block does not meet the requirements within the required time, which affects the operation of the aluminum electrolytic cell.
3. Improve the electrical conductivity of petroleum coke raw materials.
The calcined coke specific resistance affects the final product resistivity.
4. Improve the chemical stability of petroleum coke raw materials. Improved oxidation resistance.
Graphitized petroleum coke recarburizer is a process of treating petroleum coke into high temperature by graphite. This process is the process of energizing petroleum coke and then calcining at a high temperature of 3000 degrees, so that the carbon molecular form of petroleum coke is changed from irregular arrangement to hexagonal uniformity. In the way of arrangement, petroleum coke in this way can be better decomposed in molten iron to improve the effect of carbon absorption. Graphitized petroleum coke is the best refining agent for smelting. In the steelmaking industry, to produce good steel, there must be good raw materials, including good recarburizers, and graphitized petroleum coke is the best recarburizer. In the absence of graphitized petroleum coke, the graphite electrode has less scrap and higher price, which not only increases the cost of steelmaking, but also restricts the development of the steel industry. The appearance of graphitized petroleum coke breaks this bottleneck.
How much is a ton of recarburizer? The price of recarburizer depends on the specific indicators and particle size, such as the amount of fixed carbon, the amount of sulfur, the size of the grain, etc., in order to report the exact price, as well as the source of goods and freight, etc., Foshan Jitian Foundry Co., Ltd. mainly supplies calcined After the coke recarburizer and graphitization recarburizer, for Guangdong, Hunan, Guangxi, Jiangxi, Fujian and other provinces, customers are welcome to contact 2018 the most new carbon agent price, indicators and granularity!
Calcined coke recarburizer (petroleum coke): 2018.09.02 This week, the mainstream price of calcined coke recarburizer market remained stable, and individual companies offered slightly higher prices, and the market was stable. Raw materials: The price of domestic medium-high sulfur calcined coke has risen this week, with a concentration of 70-150 yuan/ton. The main reason for the increase in coke price is supply reduction and cost increase. In terms of raw materials, domestic petroleum coke prices are still rising mainly this week. The local refinery coke price has started to fall slightly on Wednesday. On the supply side, the supply of calcined coke in Shandong has decreased this week, mainly due to the impact of environmental supervision. Shandong this week The operating rate of Dongying calcined coke was significantly reduced. Most enterprises cut production by half and one was shut down. The production of calcined coke in other parts of Shandong has not been affected significantly. The fluctuations of calcined coke in Jiangsu and Hebei this week are not significant. Market outlook: It is expected that the market price of domestic medium and high sulfur calcined coke will be stabilized and stabilized next week.
Graphitized petroleum coke recarburizer (petroleum coke): 2018.09.02 This week, the price of graphitized petroleum coke recarburizer was stable, the market spot was abundant, and the shipment situation was general. Among them, the production of individual enterprises in Henan and Xinjiang was suspended due to environmental protection, and the operating rate fell. In addition, the graphitization enterprises of anode materials in the anode market will be put into production in the second half of the year. It is expected that the output will be released one after another, affecting the overall supply of graphitized recarburizer market. The concentration of negative electrode enterprises in Inner Mongolia is high, and the graphitization and recarburizer processing enterprises have also been transferred, and the market concentration has increased. The Jiangsu area is operating normally and the shipments are good. The orders are mainly for the old customers. The anode materials processing enterprises in Qinghai, Lanzhou, Ningxia, Inner Mongolia and other regions have higher activity and increased production.
At this stage, the recarburizing agent is mainly a calcined coal recarburizer (coal), a calcined coke recarburizer (petroleum coke) and a graphitized recarburizer (petroleum coke), and the mainstream is a post-calcined coke recarburizer, individual enterprises. If the quality requirements are good, the graphitized recarburizer will be chosen but the price will be high. This week, the mainstream price of China's carbon refining agent market was stable and the market was trading normally. At the same time, due to strict environmental inspections, the situation in various places is relatively severe.
Among them, the market price of general calcined coal recarburizer is stable, some manufacturers offer a small decrease, mainly due to downstream receiving; the post-calcining coke recarburizer is subject to rising price of raw petroleum coke, and the price of small enterprises is raised, but the mainstream price has not yet appeared; The market price of chemical refining agents is relatively stable. The start-up in Jiangsu has been slightly reduced, the shipments are normal, and the environmental protection pressure is very high. The orders are mainly for the old customers. The anode materials processing enterprises in Qinghai, Lanzhou, Ningxia and Inner Mongolia are more active.
Pu calcined coal recarburizer (coal quality): This week, the overall market price of China's general calcined coal recarburizer has been slightly reduced. Some regions have also increased due to supply and demand. The market is generally trading, and enterprises are mostly implementing old orders and maintaining Old customers are the mainstay. Enterprises in the main producing area of Ningxia are still in the process of rectification of dust-proof equipment, waiting for acceptance.
Calcined coke recarburizer (petroleum coke): This week, the mainstream price of calcined coke recarburizer market remained stable, with individual companies offering slightly higher prices and stable market transactions. Raw materials: The price of domestic medium-high sulfur calcined coke has risen this week, with a concentration of 70-150 yuan/ton. The main reason for the increase in coke price is supply reduction and cost increase. In terms of raw materials, domestic petroleum coke prices are still rising mainly this week. The local refinery coke price has started to fall slightly on Wednesday. On the supply side, the supply of calcined coke in Shandong has decreased this week, mainly due to the impact of environmental supervision. Shandong this week The operating rate of Dongying calcined coke was significantly reduced. Most enterprises cut production by half and one was shut down. The production of calcined coke in other parts of Shandong has not been affected significantly. The fluctuations of calcined coke in Jiangsu and Hebei this week are not significant. Market outlook: It is expected that the market price of domestic medium and high sulfur calcined coke will be stabilized and stabilized next week.
Relevant industry impact: This week, the domestic steel prices went down as a whole. As the snails fell sharply, the market wait-and-see atmosphere was heavier, and the fear of high sentiment spread. In addition, the pressure on merchants at the end of the month was highlighted, and the steel price was ushered back and forth. As the environmental protection policy continues to be high-pressure, the cost end is strongly supported, and the steel mills are still willing to pay a good price. It is expected that the short-term domestic steel prices will stabilize and adjust, and the downward trend will gradually narrow. For the refining agent market, the procurement enthusiasm is relatively slow, and the mainstream transaction price of the common specifications of the calcined coke recarburizer enterprises.
Graphitized petroleum coke recarburizer (petroleum coke): This week, the price of graphitized petroleum coke recarburizer was stable, the market spot was abundant, and the shipment situation was general. Among them, the production of individual enterprises in Henan and Xinjiang was suspended due to environmental protection, and the operating rate fell. In addition, the graphitization enterprises of anode materials in the anode market will be put into production in the second half of the year. It is expected that the output will be released one after another, affecting the overall supply of graphitized recarburizer market. The concentration of negative electrode enterprises in Inner Mongolia is high, and the graphitization and recarburizer processing enterprises have also been transferred, and the market concentration has increased. The Jiangsu area is operating normally and the shipments are good. The orders are mainly for the old customers. The anode materials processing enterprises in Qinghai, Lanzhou, Ningxia, Inner Mongolia and other regions have higher activity and increased production.
The market outlook: the price of the calcined coal recarburizer is stable or slightly decreased. The calcined coke refiner has risen slightly and stabilized. It is mainly affected by the price of raw petroleum coke, and the price of graphitized recarburizer remains stable.
Foshan Yoshida Casting Materials Co., Ltd. has long-term supply of various particle size indicators of recarburizers, calcined coke recarburizers and graphitized recarburizers. There are various indicators, and the particle size can be selected according to customer needs.
The calcined coke recarburizer is obtained by calcining petroleum coke, also called calcined coke, calcined petroleum coke. The main component is carbon. Its role is to increase carbon as its name suggests. However, the quality of different recarburizers is not the same. The higher the carbon content, the lower the basic impurities (basic impurities refer to ash, volatiles, moisture, etc.). Another one is the sulfur and nitrogen content in the composition. The role of sulfur is basically clear. The inclusion of a certain amount of sulfur in the cast iron can better improve the physical properties of the casting. In recent years, the nitrogen content has also been extensively studied. The nitrogen content is too high, nitrogen holes are generated, the nitrogen content is too low, the hardness of the castings is not high, and the ferrite is much.
The role of the calcined coke recarburizer is for casting cast iron and cast steel. Castings have a requirement for carbon, so the recarburizer is used to increase the carbon content of the molten iron. The common charge in smelting is pig iron, scrap steel, and recycled material. The carbon content of pig iron is high, but the purchase price is higher than that of scrap steel. Therefore, increasing the amount of scrap steel, adding high-quality recarburizer, reducing the amount of pig iron added, saving production costs and meeting the production needs. The recarburizer is slightly different for each batch. You have to be a specific percentage, which is not realistic. Other ingredients are ash, moisture, sulfur, phosphorus and the like.
Graphite recarburizer has high degree of graphitization, low sulfur, low nitrogen, less harmful impurities, very fast dissolution, no absorption, no residue, no floating, no residue, less added; low sulfur and low nitrogen, very graphitized High, very suitable for all (or most) use of shavings, cold-filled materials, briquettes, wire, particle steel as raw materials, smelting vermicular cast iron, ductile iron, gray cast iron. We will provide targeted recarburizers according to the characteristics of different customers' process castings, and it is not expensive to ensure that the products are easy to use!
Scope of application: It is used for carbonization of cast iron and cast iron in various electric furnaces. It is especially suitable for the ball mill cast iron industry with strict requirements on product quality and strict sulfur control. Compared with other types of recarburizers, it has an absolute price advantage. The intermediate frequency furnace of half a ton to 12 tons, the furnace temperature is controlled at about 1500 degrees. The absorption rate can reach up to 93%.
Particle size: 0-2mm, 1-2mm, 0-3mm, 1-3mm, 1-5mm...etc. (can be selected according to customer's needs)
In the iron and steel smelting process, due to improper ingredients or improper loading and excessive decarburization, the carbon content in steel or iron sometimes fails to meet the expected requirements, and carbon is added to steel or molten iron. The main substances commonly used for carbon addition are anthracite powder, carbon-increasing pig iron, electrode powder, petroleum coke powder, pitch coke, charcoal powder and coke powder. The requirement for recarburizer is that the higher the fixed carbon content, the better, and the lower the content of harmful impurities such as ash, volatile matter and sulfur, the better, so as not to contaminate the steel.
The smelting of castings uses high-quality recarburizer after high-temperature burning of petroleum coke with little impurities. It is also the calcined coke that I often say, which is the most important part of the carbon-increasing process. The quality of the recarburizer determines the quality of the molten iron and determines whether it can achieve good graphitization. In short, reducing the shrinkage of the molten iron recarburizer plays a pivotal role.
In the smelting of the whole scrap electric furnace, the graphitized recarburizer is preferred. After the high-temperature graphitization of the rebcarurizer, the carbon atoms can be changed from the original disordered arrangement to the sheet-like arrangement, and the flake graphite can become the best of the graphite nucleus. The core is to promote graphitization. Therefore, in pursuit of high quality requirements, we should use a high-temperature graphitized recarburizer. Because of the high temperature graphitization treatment, sulfur is reduced by the generation of S02 gas. Therefore, the graphitized rebcarburizer has a very low sulfur content, w(s) is generally less than 0.05%, and better w(s) is even less than 0.03%. At the same time, this is also an indirect indicator of whether or not high temperature graphitization and graphitization are good. If the selected recarburizer is not subjected to high temperature graphitization, the nucleation ability of graphite is greatly reduced, the graphitization ability is weakened, and even if the same amount of carbon can be achieved, the result is completely different.
The so-called rebcarurizer is to increase the carbon content in the molten iron after the addition, so the fixed carbon content of the recarburizer must not be too low, otherwise it is necessary to add more than the high-carb recarburizer to achieve a certain carbon content. The sample, which undoubtedly increases the amount of other unfavorable elements in the recarburizer, does not allow the molten iron to obtain better yields.
The low content of sulfur, nitrogen and hydrogen is the key to prevent the formation of nitrogen pores in the casting, so that the lower the nitrogen content of the recarburizer, the better. Other indicators of recarburizer, such as the lower the amount of moisture, ash, and volatile matter, the higher the fixed amount of damage, so the high fixed carbon content, the content of these harmful components must not be high. It is also important to select the appropriate recarburizer particle size for different melting methods, furnace types and size of the melting furnace. It can effectively increase the absorption rate and absorption rate of the recarburizer by the molten iron, and avoid the increase due to too small particle size. The agent is oxidized and burned. The particle size is preferably: 100 kg furnace is less than 10 mm, 500 kg furnace is less than 15 mm, 1.5 ton furnace is less than 20 mm, and 20 ton furnace is less than 30 mm. In converter smelting, when high carbon steel is used, a recarburizer containing little impurities is used.
The requirement for recarburizer for top-blown converter steelmaking is that the fixed carbon is high, the ash, volatiles and sulfur, phosphorus, nitrogen and other impurities are low, dry, clean and moderately sized. Its fixed carbon C>97%, volatile matter <1.0%, S<0.5%, moisture <0.5%, particle size in l-5mm. The particle size is too fine to be easily burned, and when it is too thick, it floats on the surface of the molten steel and is not easily absorbed by the molten steel. For the induction furnace, the particle size is 0.2-6mm, wherein the steel and other ferrous metals have a particle size of 1.4-9.5mm, the high carbon steel requires low nitrogen, the particle size is 0.5-5mm, etc., and the specific need to smelt the workpiece according to the specific furnace type. The specific types and details of the specific judgment and selection.
Cast iron carburizing agent is a kind of additive for steelmaking, which can greatly increase the amount of scrap steel, reduce the dosage of pig iron or do not use pig iron. The use of calcined petroleum coke in steelmaking can not only reduce the use of pig iron, but also increase the utilization of scrap steel. Carburizing agent is an essential carbon addition material for producing high quality steel. Different types of cast iron are selected, and different types of carburizing agents are selected according to needs.
At present, the vast majority of recarburizer are suitable for electric furnace melting, and some of the fast absorption carburizing agents are used in cupola. The feeding way of electric furnace smelting should be carburized with the burden of steel and other materials. The small dosage can be added to the surface of molten iron. However, it is necessary to avoid bulk feeding into molten iron to prevent excessive oxidation. The amount of calcined petroleum coke is determined according to the ratio of other raw materials and carbon content. The characteristics of carburizing agent itself choose pure carbon graphitized material, reduce too much impurity in pig iron, and the selection of carburizing agent can reduce the cost of casting production.
The requirement of recarburizer for foundry steelmaking is high carbon content, high carbon content, low sulfur content, stable carburizing effect and high carbon absorption rate. It can be used in various electric furnaces to smelt cast steel and cast iron, and bring considerable economic benefits to production. But do you know what kind of carburizing agent is good carburizing agent? First, the appearance of the carburizer, clean and impurity-free.
Steelmaking recarburizer for casting, cast iron, cast steel, cast will have a requirement for carbon, then recarburizer just as its name implies is to increase the carbon content in liquid iron, and, for example, commonly used in smelting furnace charge for pig iron, scrap steel, back to the furnace charge, iron carbon content is high, but relatively scrap purchase price is higher section, so adding scrap supply, reduce the quantity of pig iron, add recarburizer, can have certain effect to reduce the casting cost.
Below by yu da energy conservation for you to introduce.
In the process of smelting, the carbon content of steel does not meet the requirements of the top period due to improper mixing or charging and excessive decarbonization, etc. At this time, carbon is added to the steel solution.
Common carbon - increasing agents are carbon - increasing pig iron, electrode powder, petroleum coke powder, charcoal powder and coke powder.In converter smelting, high - carbon steel, the use of oil coke containing few impurities as a carbonizing agent.
The requirements for the top blown converter steelmaking use of the carburizer are high fixed carbon, low ash, volatile and sulfur, phosphorus, nitrogen and other impurities, and dry, clean, moderate particle size.
Recarburizer is suitable for smelting in induction furnace, but its application is different according to the technical requirements.
(1) in the smelting process of medium-frequency electric furnace, the use of carbon intensifier can be added to the lower part of the furnace with the material in accordance with the requirements of proportion or carbon equivalent, and the recovery rate can reach more than 95%;
(2) if the lack of carbon adjustment, the first dozen net furnace slag, plus carburant, by raising the temperature of molten iron, or artificial electromagnetic stirring to dissolve carbon absorption, the recovery rate is around 90%, if the low-temperature carbonization process, the melt furnace charge only part of the molten iron liquid under the condition of low temperature, all recarburizer one-time in liquid iron, at the same time with solid charge to press it into the liquid iron don't let it show liquid iron surface.
This method can increase the carbon content of iron liquid by more than 1.0%.
Name: Owen Zhang
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Add: Foshan, Guangdong, China