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What is the difference between the carbide slag and the silicon iron slag

Date: 06-19-2019

We all know that calcium carbide slag can be extracted from ferrosilicon slag. What is the difference between calcium carbide slag and ferrosilicon slag?

The chemical composition of calcium carbide slag is related to the quality of calcium carbide. Taking a factory as an example, its composition is as follows: calcium oxide accounts for 63.93%, magnesium oxide 1.27%, aluminium oxide 0.50%, iron oxide 0.96%, silica 7.90%, burning weight loss 24.30%. The proportion of carbide slag is 1.82, the dry bulk density is 0.683 g/cm 3, the wet bulk density is 1.366 g/cm 3, and the sieving residual of fineness through 4900 holes per square centimeter is 14.4%.


Ferrosilicon slag is used as deoxidizer and alloying agent in steelmaking industry. In order to obtain qualified steel with chemical composition and ensure the quality of steel, deoxidization must be carried out in the final stage of steelmaking. The chemical affinity between silicon and oxygen is very high. Therefore, ferrosilicon is a strong deoxidizer used for precipitation and diffusion deoxidization in steelmaking. The strength, hardness and elasticity of steel can be remarkably improved by adding a certain amount of silicon in steel. Therefore, ferrosilicon is also used as alloying agent in the smelting of structural steel (0.40-1.75% of silicon in bud), tool steel (containing SiO.30-1.8%), spring steel (containing SiO.40-2.8%) and transformer silicon steel (containing silicon 2.81-4.8%).

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