Process for the treatment of raw materials containing arsenic an

Details Process for the treatment of raw materials containing arsenic an Process for the treatment of raw materials containing arsenic an

1978-11-01

1980-09-02

Langel, Wayne A.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group ib metal

423 1, 423 87, 423146, C01G 310, C01G 5110, C01G 5310

Patent

active

042206278

ABSTRACT:
A process for the treatment of raw materials which contain arsenic and metal to produce a metal-free arsenic product and an arsenic-free metal sulfate is disclosed, in which the raw material is leached by using an aqueous solution of sulfuric acid and then the metals are crystallized as sulfates from the separated aqueous solution, which is separated from the metal sulfate crystals. The leach is performed at elevated temperature under oxidizing conditions, in order to bring the arsenic to a 5-valent form, the metal sulfates are crystallized out from the selectively separated, arsenate-bearing aqueous solution by cooling, and arsenic is removed from at least part of this aqueous solution before the aqueous solution is returned to the leach.

REFERENCES:
patent: 1863807 (1932-06-01), Schopper
patent: 4061564 (1977-12-01), De Schepper et al.
patent: 4102976 (1978-07-01), Hiemeleers et al.

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