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How to resolve the low absorption of carbon raiser?
Views: 161 Update date: Aug 02,2021

For a long time, the low absorption of carbon raiser has been the most common problem encountered by many foundries. Because of the low absorption of carbon raiser, this problem causes waste when using carbon raiser, and also greatly reduces the recarburization effect. It even affected the quality of the product. The absorption of carbon raiser affects the chemical composition of molten iron. The carbon raisers of different proportions of silicon, manganese, carbon, and sulfur have different absorption rates during the melting process of the electric furnace, and the influence of silicon, manganese, carbon, and sulfur decreases in order, as follows:

 

When the initial carbon content increases by 0.1%, the carbon raiser absorption rate will decrease by approximately 1% to 2%.

 

When the initial silicon content increases by 0.11%, the carbon raiser absorption rate is high, will decrease by approximately 3%~4%.

 

When the initial sulfur content increases by 0.1%, the carbon raiser absorption rate will decrease by approximately 1% to 2%.

 

When the initial manganese content increases by 0.1%, the absorption rate of carbon raiser will increase by approximately 2% to 3%. It can be calculated according to this ratio.

 

When the initial carbon content in the molten iron is high, the absorption rate of carbon raiser is slow, the absorption amount is small, the burning loss is relatively large, and the absorption rate of carbon raiser is low under a certain solubility limit.

 

When the initial carbon content of the molten iron is low, under a certain dissolution limit, the carbon raiser will absorb quickly, with a large amount of absorption, relatively little burn loss, and a high absorption rate of the carbon raiser.

 

Silicon and sulfur in the molten iron hinder the absorption of carbon and reduce the absorption rate of carbon raiser, while manganese contributes to the absorption of carbon and increases the absorption rate of carbon raiser. In terms of the degree of influence, silicon is the largest, followed by manganese, and carbon, sulfur has little effect. It can be seen that the addition time of the carbon raiser is an important factor affecting the absorption rate. The ratio of the addition amount to the capacity of the electric furnace and the melting time will affect the absorption rate of the carbon raiser, so it should be controlled reasonably to add the carbon raiser to achieve the desired effect!




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