Process for preparing silicium-based complex ferroalloys

Details Process for preparing silicium-based complex ferroalloys Process for preparing silicium-based complex ferroalloys

C - Chemistry, Metallurgy

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C

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C22C 38/02 (2006.01) C21C 5/52 (2006.01) C22B 1/24 (2006.01) C22C 33/00 (2006.01)

Patent

CA 1224046

PROCESS FOR PREPARING SILICON-BASE COMPLEX FERROUS ALLOYS Abstract The invention relates to a process for the continuous preparation of silicon-base complex ferrous alloys from cheap raw materials by preparing a charge with a high electric resistance and reducing the same in an electric arc furnace. According to the invention, a charge is assembled which contains the total amount of carbon in a 0.82 to 0.99-fold quantity of that required to reduce all oxides of the charge to elements and adjusting this carbon content by preparing pellets which, in addition to the binding material, contain a) as oxide to be reduced in an amount of at least 50% by weight such oxides of only base-forming or only amphoteric or only acid-forming elements which form with each other compounds or eutectics melting above 1600°C, and b) a carbonaceous reducing agent and/or carbides in such an amount that the quantity of carbon is either 1.05 to 1.35 times higher than required to transform the oxides of the pellet to the carbides or 0.66 to 0.02- fold of the quantity required to reduce the oxides of the pellet to metallic elements, and assembling the charge .alpha.) from pellets con- taining an excess of carbon and/or from lumpy carbides and .beta.) from carbon-deficient pellets or from a lumpy oxide of a base-forming or amphoteric or acid-forming element and .gamma.) from lumpy carbon carriers, and optionally .delta.) from an iron additive, with the pro- viso that no pellet may contain boron trioxide, and boron trioxide may not be present even as a charge component. By the process of the invention, the utilization of cheap raw materials for the prep- aration of silicon-base complex ferrous alloys becomes possible without any deterioration of the quality of the alloy.

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