C - Chemistry – Metallurgy – 01 – G
Patent
C - Chemistry, Metallurgy
01
G
23/232
C01G 28/02 (2006.01) C01G 3/00 (2006.01)
Patent
CA 2040353
PC-3165 ABSTRACT METHOD FOR FORMING COPPER ARSENATE 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.
Krause Eberhard
Laundry Steven W.
Zatka Vladimir J.
Inco Limited
Krause Eberhard
Laundry Steven W.
Smart & Biggar
Zatka Vladimir J.
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