Method for treatment of residues from organochlorosilane...

C - Chemistry – Metallurgy – 22 – B

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C22B 7/04 (2006.01) C01B 33/107 (2006.01) C22B 3/06 (2006.01) C22B 15/00 (2006.01)

Patent

CA 2162052

The present invention relates to method for treatment of residues originating from organochlorosilanes- and/or chlorosilane syntheses. The residues are, optionally together with an oxidation agent, supplied to a smelting furnace where the residues are melted in order to form a molten metallic phase comprising at least of silicon and copper and a slag phase, tapping of the metallic melt and an inert slag from the smelting furnace. Copper is dissolved from the solidified silicon-copper containing metallic phase by leaching with a mineral acid in order to produce a solid product substantially comprising silicon, whereafter copper is recovered from the leach solution.

Procédé de traitement de résidus produits par la synthèse d'organochlorosilanes et/ou de chlorosilanes. On introduit les résidus, éventuellement associés à un agent oxydant, dans un four de fusion où l'on fond les résidus pour former une phase métallique en fusion constituée au moins de silicium et de cuivre, et une phase sous forme de scories, puis on soutire à partir du four la masse métallique en fusion et des scories inertes. On sépare le cuivre de la phase métallique solidifiée renfermant le silicium et le cuivre, par lixiviation à l'aide d'un acide minéral, afin d'obtenir un produit solide renfermant essentiellement du silicium, puis on récupère le cuivre à partir de la solution de lixiviation.

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