Method for extraction of metals and metal oxides from...

C - Chemistry – Metallurgy – 22 – B

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C22B 7/02 (2006.01) C22B 13/02 (2006.01) C22B 19/30 (2006.01)

Patent

CA 2269937

A method for separation and recovery of metals and metal oxides from industrial minerals and waste materials containing zinc, lead, cadmium, arsenic, iron, mercury and selenium. The metals and metal oxides in dust form are mixed with a reducing agent and additives, agglomerated, heated above 800 ~C, and contacted with a flow of inert, reducing or slightly oxidizing gases to volatilize the metals and metal oxides for recovering separate from solid residual product.

L'invention porte sur un procédé de séparation et récupération de métaux et d'oxydes métalliques présents dans des minéraux industriels et dans des déchets contenant du zinc, du plomb, du cadmium, de l'arsenic, du fer, du mercure et du sélénium. Les métaux et oxydes métalliques sous forme de poudre sont mélangés à un agent réducteur et à des additifs puis agglomérés, chauffés à plus de 800 ·C, puis mis au contact d'un courant de gaz inertes, réducteurs ou légèrement oxydants, de manière à volatiliser les métaux et oxydes métalliques et à les récupérer séparément des produits résiduels solides.

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