Method for production of fesi

C - Chemistry – Metallurgy – 22 – B

Patent

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C22B 4/00 (2006.01) C22B 4/04 (2006.01) C22C 33/00 (2006.01) C22C 33/04 (2006.01) C22C 35/00 (2006.01)

Patent

CA 2170057

Method for production of ferrosilicone in an electric reduction furnace, by using iron-containing, quartz-containing and carbonaceous materials. The reduction furnace is, in addition to Si-containing materials, supplied with agglomerates, which replace in at least a portion of the iron-containing material. The agglomerate comprises a substantially homogenous mixture of a carbonaceous material and a reducible iron compound, iron, whereby the weight ratio between carbon and iron in the reduced agglomerates is in the range from 0.2:1 to 1.5:1 based upon reduced agglomerate. The agglomerate effects an absorption of SiO gas present in the furnace which normally is lost through the off gases from the furnace, thus increasing Si yield and decreasing energy consumption.

L'invention se rapporte à un procédé pour la production de ferrosilicone dans un four à réduction électrique, grâce à l'utilisation de matériaux à teneur en fer, à teneur en quartz et à teneur en carbone. Ce four à réduction est, en plus des matériaux à teneur en Si, alimenté en agglomérats, qui remplacent au moins une partie du matériau à teneur en fer. L'agglomérat contient un mélange essentiellement homogène d'un matériau charbonneux et un composé de fer réductible, éventuellement du fer, de sorte que le rapport en poids entre le carbone et le fer dans les agglomérats réduits est compris entre 0,2/1 et 1,5/1, calculé sur la base de l'agglomérat réduit. Cet agglomérat assure l'absorption des gaz de SiO présents dans le four, qui normalement sont perdus avec les effluents gazeux sortant du four, ce qui permet d'accroître la production de Si et d'abaisser la consommation d'énergie.

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