Briquette as an additive for metallurgic purposes comprising...

C - Chemistry – Metallurgy – 21 – C

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C21C 1/08 (2006.01) C21B 3/02 (2006.01) C21B 5/02 (2006.01) C21C 7/00 (2006.01) C21C 5/36 (2006.01)

Patent

CA 2195922

Briquette comprising silicon-containing residues as an additive for metallurgic purposes. Silicon-containing residues, as they accumulate especially during the synthesis of organosilanes out of metallic silicon, and especially methyl chloride, are processed according to the invention to briquettes, being additives for the quality adjustment of cast iron being produced in a cupola furnace in order to avoid either costly regeneration for the recovering of the valuable components or the total dumping of said silicon-containing residues. Besides the silicon-containing residue the briquettes contain 1 - 10 percent by weight of cardboard fibre, 5 - 40 percent by weight of hydraulic cement and 0 - 20 percent by weight of additional additives having influence on the quality of the cast iron. The cement- and cardboard fibre-containing briquettes are mechanically and thermally sufficiently stable with respect to the operation of the melting furnace. The yielding rate of the inserted small-sized silicon in the cast iron is about 85 % and reaches thereby the same range of lumpy ferrosilicon.

riquette comprenant des résidus contenant du silicium, utilisée comme additif en métallurgie. Les résidus contenant du silicium, au fur et à mesure qu'ils s'accumulent particulièrement pendant la synthèse des organosiliciés à partir du silicium métallique, et surtout le chlorométhane, sont transformés, grâce à cette invention, en briquettes, pour devenir des additifs utilisés pour le réglage de la composition de la fonte produite dans un cubilot afin d'éviter soit la régénération coûteuse permettant de récupérer les composants valables soit l'élimination complète des résidus contenant du silicium. En plus des résidus de silicium, les briquettes renferment 1-10 % en poids de fibre de carton, 5-40 % en poids de ciment hydraulique et 0-20 % en poids d'autres additifs ayant une incidence sur la qualité de la fonte. Les briquettes contenant du ciment et de la fibre de carton sont suffisamment stables sur les plans thermique et mécanique en ce qui a trait au fonctionnement du four de fusion. Le taux de rendement du silicium de petite dimension inséré dans la fonte est d'environ 85 % et est, de ce fait, du même ordre que celui du ferrosilicium en bloc.

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