C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/225
C22B 3/06 (2006.01) C01B 21/20 (2006.01)
Patent
CA 1309259
IMPROVED HYDROMETALLURGICAL ARSENOPYRITE PROCESS ABSTRACT This invention is directed to an improved process for leach treating gold and silver bearing pyritic and arsenopyritic concentrates and ores. More particularly, the improved process avoids the necessity of adding recycled neutralized solution to the leach solution, thereby alleviating difficulties in maintain- ing acid levels in the leach solution, and provides for bleeding solutions containing dissolved arsenic, iron and sulphate from the process without the loss of oxidized nitrogen species. The process for recovering valuable metals from pyritic and arsenopyritic concen- trates and ores involves decomposing the arsenopyrite or pyrite concentrates and ores in acidic solution in a common volume space which contains a gas phase and a liquid slurry (which comprises a liquid phase and a solid phase) through the action of higher valence oxidized nitrogen species in which the nitrogen has a valence of at least plus 3. The active oxidized nitro- gen species are regenerated in the same common volume space by an oxygen containing gas. The concentrate or ore is introduced into a denitrating step. The liquid and solid products of the denitrating step are subjected to a solid-liquid separation, after which the solids from the separation step are transported to a leaching vessel where the solids are treated with oxygen and nitric oxide replaced from the denitrating step.
538019
Beattie Morris J.v.
Raudsepp Rein
Oyen Wiggs Green & Mutala
Sasox Processing Pty. Ltd.
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