Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group va metal or arsenic
Patent
1989-11-09
1990-10-09
Langel, Wayne A.
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Group va metal or arsenic
204 98, 423602, C25B 114, C01G 2802
Patent
active
049619098
ABSTRACT:
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 membrances 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.
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Comino Ltd.
Fors Arne I.
Langel Wayne A.
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