Specialized metallurgical processes – compositions for use therei – Processes – Free metal or alloy reductant contains magnesium
Patent
1985-11-14
1987-03-03
Doll, John
Specialized metallurgical processes, compositions for use therei
Processes
Free metal or alloy reductant contains magnesium
75 2, 75 97A, 75101R, 75103, 75108, 75109, 423 27, 423 34, 423 42, 423 87, 423140, 423143, 423150, 423594, 423602, 204109, C01G 4900, C22B 1104
Patent
active
046473076
ABSTRACT:
A process for the hydrometallurgical recovery of precious metal from an ore or concentrate containing at least some arsenopyrite or pyrite. The process comprises forming in a common volume space a gas phase and a liquid slurry comprising the ore or concentrate as the solid phase and acid and water as the liquid phase of the slurry effecting in the slurry an oxidation-reduction reaction between the arsenopyrite or pyrite and an oxidized nitrogen species in which the nitrogen has a valence of at least plus 3 thereby solubilizing in the liquid phase the arsenic, iron and sulphur in the arsenopyrite, or the iron and sulphur in the pyrite, and producing in the liquid phase nitric oxide in which the nitrogen has a valence of plus 2; releasing at least part of the nitric oxide from the liquid phase into the gas phase oxidizing the nitric oxide in the gas phase, to form an oxidized nitrogen species in which the nitrogen has a valence of at least plus 3; and absorbing the oxidized nitrogen species into the slurry wherein the oxidized nitrogen species become available for the oxidation-reduction reaction. The resultant treated slurry is subjected to a solid-liquid separation to produce a solid residue and a liquid fraction. Precious metal is recovered from the solid residue. The liquid fraction is recycled in the process.
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Bailar, Jr.; J. C. et al. Comprehensive Inorganic Chemistry, vol. 3, 1970, pp. 96-97.
Beattie Morris J. V.
Peters Ernest
Raudsepp Rein
Doll John
Stoll Robert L.
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