Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group ib metal
Patent
1993-03-05
1994-07-26
Lewis, Michael
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Group ib metal
423 34, 423 36, 423 41, 423 45, 423 99, 423101, 423106, 423140, 423143, 423145, 423146, C01G 314, C22B 1500, C22B 1900, C22B 2300
Patent
active
053325605
ABSTRACT:
A method for the recovery of copper from copper-containing materials, for example, scrap, ores or dust. An aqueous cupric tetrammine sulfate lixiviant is contacted with the copper-containing material to produce a leachate containing cuprous, nickel, and zinc ions, ammonium sulfate and free ammonia. Copper can be recovered from the leachate by electrolysis. Nickel and zinc can be precipitated from the resulting spent electrolyte by oxidizing substantially all of the cuprous ions in the copper ammine sulfate solution to cupric ions and lowering the pH of the solution to a range from about pH 7.5 to about pH 8.0 in order to form a precipitate. Alternatively, copper sulfate can be added to the cupric ammine sulfate-containing solution in order to form nickel and/or zinc containing precipitate.
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Kruesi Paul R.
Kruesi William H.
Bos Steven
Cato Research Corporation
Lewis Michael
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