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What is the use of carbon additive(recarburizer) for steelmaking?

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%.

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