Process for the manufacture of copper arsenate

C - Chemistry – Metallurgy – 01 – G

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23/232, 204/63

C01G 28/02 (2006.01) C25B 1/00 (2006.01)

Patent

CA 2002489

In a process for the manufacture of copper arsenate, an arsenic-containing material is subjected to an oxidative pressure leach with sodium hydroxide forming a leach solution containing sodium arsenate. Sodium arsenate solution is mixed with a solution of copper sulfate for the formation of a copper and arsenic-containing solution without the precipitation of copper arsenate. The copper and arsenic-containing solution is treated for the precipitation of copper arsenate with formation of sodium sulfate solution. At least one of the sodium arsenate-containing solution and the sodium sulfate solution is subjected to electrolysis with membranes for at least partial conversion to arsenic acid and sulfuric acid, respectively, and sodium hydroxide. The generated sodium hydroxide is used in the process, the sulfuric acid may be a by-product or is recycled for use in the preparation of copper sulfate solution, and the arsenic acid is used instead of sodium arsenate in the formation of the copper and arsenic-containing solution.

Dans une méthode de production d'arséniate de cuivre, une matière renfermant de l'arsenic est soumise à une lixiviation oxydative sous pression avec de l'hydroxyde de sodium, de façon à former une solution de lixiviation renfermant de l'arséniate de sodium. La solution d'arséniate de sodium est mélangée avec une solution de sulfate de cuivre pour la formation d'une solution renfermant du cuivre et de l'arsenic, sans précipitation d'arséniate de cuivre. La solution renfermant du cuivre et de l'arsenic est traitée pour la précipitation de l'arséniate de cuivre, sans formation de solution de sulfate de sodium. Au moins l'une des solutions renfermant de l'arséniate de sodium ou du sulfate de sodium est soumise à l'électrolyse par membranes pour la conversion au moins partielle respectivement en acide arsénique et en acide sulfurique, ainsi qu'en hydroxyde de sodium. L'hydroxyde de sodium produit est utilisé dans le procédé; l'acide sulfurique peut former un produit secondaire ou être recyclé pour la préparation de la solution de sulfate de cuivre; enfin, l'acide arsénique est employé à la place de l'arséniate de sodium pour la formation de la solution renfermant du cuivre et de l'arsenic.

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