Recovery of copper from ammoniacal copper sulfate solution

Details Recovery of copper from ammoniacal copper sulfate solution Recovery of copper from ammoniacal copper sulfate solution

1974-07-24

1976-05-04

Ozaki, G.

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

75108, 423 36, 423512A, C22B 1512

Patent

active

039544532

ABSTRACT:
Metallic copper is recovered from an ammoniacal copper sulfate solution by treating such solution with sulfur dioxide to form a precipitate of copper ammonium sulfite. The crystals are suspended in an acidic solution containing initially from 20 to 75 grams per liter of sulfuric acid, which preferably contains a substantial concentration (up to saturation) of ammonium sulfate, said solution containing from 40% to 70% by weight of such crystals, and the resulting suspension is heated at 140.degree.C. to 170.degree.C. and at 150 to 220 psi. until substantially all the copper ammonium sulfite has been converted to metallic copper. The metallic copper thereafter is separated from the residual solution.

REFERENCES:
patent: 3148051 (1964-09-01), Chupungco et al.
patent: 3228765 (1966-01-01), Chumpungco et al.

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