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| Recovery of Elemental Sulfur from Zinc Pressure Acid Leaching Residue |
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Received:April 11, 2019
Revised:April 16, 2019
Accepted:April 17, 2019
Published Online:June 17, 2019
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| DOI：doi：10.3969/j.issn.1007-7545.2019.07.008 |
| KeyWord:zinc pressure acid leaching residue; flotation; melting and filtration; ammonium sulfide; elemental sulfur |
| Author | Institution |
| CHANG Jun |
铜仁学院材料与化学工程学院 |
| WANG Zi-yang |
铜仁学院材料与化学工程学院 |
| ZHANG Ze-biao |
昆明理工大学冶金与能源工程学院 |
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| Abstract: |
| Advantages and disadvantages to recover elemental sulfur from zinc pressure acid leaching residue by flotation method, melting and filtration method, ammonium sulfide method is contrastively analyzed. Effects of different factors on leaching process of flotation sulfur concentrate and sulfide filter cake with ammonium sulfide, and on thermal decomposition process of polysulfide solution were analyzed. The results indicate that ratio of liquid to solid and concentration of ammonium sulfide have significant impact on sulfur leaching rate. Sulfur leaching rate from sulfide filter cake is about 95% under optimal conditions. Sulfur leaching rate and recovery from flotation sulfur concentrate is 98%. Purity of sulfur obtained by thermal decomposition of ammonium polysulfide solution is 99.57%. Content of valuable metals in residue after sulfur extraction is enriched by remarkable times, which is favorable for comprehensive utilization of zinc pressure acid leaching residue. |
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