The aqueous oxidation of complex sulfide concentrates in hydrochloric acid |
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| Authors: | Tadaaki Mizoguchi Fathi Habashi |
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| Institution: | Department of Mining and Metallurgy, Laval University, Quebec City, Que. G1K 7P4 Canada |
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| Abstract: | Complex sulfides containing sphalerite, galena, chalcopyrite, and small amounts of silver in a matrix of pyrite can be decomposed at 120°C and oxygen pressure of 1000 kPa in 1–2 N HCl for 90 min to yield > 97% of the zinc and > 95% of the copper in solution while about 83% of the lead remains in the residue as PbCl2 and PbSO4 and 85% of the silver, together with most of the pyrite. The recovery of elemental sulfur is nearly 100% with respect to ZnS, PbS, and CuFeS2. Leaching in HCl is faster than in H2SO4 at the same acid normality, and the process is diffusion-controlled (strongly dependant on agitation speed and having an activation energy of 3.6 kcal/mole). Lead jarosite, Pb0.5Fe3 (SO4)2?(OH)6, is mainly formed when H2SO4 is used as a leaching agent. |
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