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| Recovery of Low-grade Molybdenum Concentrate by Alkali Pressure Oxidation and Flotation Process |
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Received:March 08, 2019
Revised:March 11, 2019
Accepted:March 12, 2019
Published Online:June 17, 2019
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| DOI：doi：10.3969/j.issn.1007-7545.2019.07.011 |
| KeyWord:non-standard molybdenum concentrate; pressure oxidation; autothermal reaction; flotation |
| Author | Institution |
| Wu Zengling |
紫金矿业集团股份有限公司低品位难处理金矿资源综合利用国家重点实验室 |
| SHI Lun-lei |
紫金矿业集团股份有限公司低品位难处理金矿资源综合利用国家重点实验室 |
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| Abstract: |
| Aiming at non-standard molybdenum concentrate, autothermal reaction was carried out by using heat released from intense oxidation of sulfur in alkali pressure oxidation process. Molybdenum grade in oxidized residue drops to 5% and molybdenum extraction rate is 96.94% after leaching for 2 hours at 160 ℃ under the conditions including ratio of liquid to solid of 7, alkali dosage of 1.2% of mass of molybdenum concentrate, stirring strength of 750 r/min, oxygen filling, and total pressure of 1.6 MPa. Molybdenum concentrate with 15.30% yield, 36.30% molybdenum grade, and 89.18% molybdenum extraction rate is obtained by flotation of autothermal oxidation residues through one roughing, one cleaning and two concentratings. Molybdenum grade in flotation tailings drops to 0.40%. With concentrate added to pressure leaching with proportion of 50%, molybdenum extraction rate is 97.20%. Overall 99.48% of molybdenum is extracted by a combined process of self-thermal pressure leaching and flotation. |
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