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| Experiment of Alkali-Sulfur Oxygen Pressure Leaching of Low Grade Gold-Bearing Sulfur Concentrates |
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Received:March 20, 2016
Revised:March 24, 2016
Accepted:March 25, 2016
Published Online:August 19, 2016
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| DOI：doi：10.3969/j.issn.1007-7545.2016.09.009 |
| KeyWord:alkali-sulfur oxygen pressure leaching; low grade gold-bearing sulfur concentrates; acid leaching |
| Author | Institution |
| gan yin |
云南黄金矿业集团股份有限公司 |
| WU Jian-cun |
云南黄金矿业集团股份有限公司 |
| LI Gang |
云南黄金矿业集团股份有限公司 |
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| Abstract: |
| Gold and silver were leached from low grade gold-bearing sulfur concentrates by alkali-sulfur oxygen pressure leaching. The optimum acidic leaching conditions including leaching temperature of 130 ℃, leaching time of 300 min, leaching pressure of 1.6 MPa, L/S of 4︰1, initial concentration of acid of 20 g/L, and lignin of 2‰. The optimum sulfur-alkali oxygen pressure leaching conditions include leaching agent of 40% of total dry ore, mass rate of sulfur to alkali of 0.35, catalyst Cu(NH3)42 of 0.06 mol/L, sodium lignosulphonate of 0.2% of dry ore, oxygen pressure of 0.4 MPa, temperature of 105 ℃, and leaching time of 5 h. The leaching rate of gold and silver is 88.23% and 61.35% respectively under these optimum conditions. |
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