Method for forming copper arsenate

Details Method for forming copper arsenate Method for forming copper arsenate

1991-06-17

1992-06-30

Niebling, John

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group ib metal

423 27, 423 34, 423 47, 423602, 423604, C01G 300, C01G 2802

Patent

active

051261162

ABSTRACT:
The invention provides a method of forming copper arsenate. Copper and arsenic are leached into a treatment solution maintained at a pH level of about 2 to 5 in the presence of at least one impurity. An oxidant is added to the treatment solution to oxidize the copper and arsenic. A copper arsenate compound is precipitated from the solution as copper arsenate. Preferably, the copper arsenate is then releached in a purification solution. The molar ratio of copper to arsenic is adjusted to a level of at least 2. The pH of the purification solution is then increased to precipitate copper arsenate having a decreased concentration of said at least one impurity. Impure copper arsenate may be suspended and reacted in a recrystallization solution preferably having cupric ion. The pH of recrystallization solution is adjusted to a valve between about 1 and 4.5.

REFERENCES:
patent: 3868439 (1975-02-01), Wadsworth
patent: 4959203 (1990-09-01), Knoen et al.
patent: 4961909 (1990-10-01), Boateng
patent: 5002748 (1991-03-01), Jones et al.
patent: 5026530 (1991-06-01), Drinkard, Jr. et al.

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