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Aiming at the problems of low molybdenum grade, complex ore properties and poor enrichment effect by conventional mineral processing methods for a certain molybdenum deposit, on the basis of ore property research, acid leaching, alkaline leaching and enhanced leaching tests were carried out respectively. The high-acid enhanced leaching process was optimally selected. The effects of sulfuric acid dosage, ore particle size, leaching temperature, oxidant dosage, liquid volume to solid mass ratio and leaching time on molybdenum leaching efficiency were investigated, and the optimal leaching process parameters were determined. The results show that under the optimal conditions of ore particle size of -100 mesh, sulfuric acid dosage of 20%, pyrolusite dosage of 3%, leaching temperature of 80 ℃, liquid volume to solid mass ratio of 1.5∶1 and leaching time of 3 h, the molybdenum leaching rate calculated by leaching residue reaches 71.18% via the high-acid enhanced leaching process. To solve the problem of excessive residual acid in high-acid enhanced leaching solution, a two-stage countercurrent leaching process is adopted. The average molybdenum leaching rate calculated by leaching residue increases to 72.16%, which is about 1 percentage point higher than that of single-stage leaching. Meanwhile, the mass concentration of residual acid decreases by more than 40%, and the total consumption of sulfuric acid reduces by 25%. The ton-scale pilot test results of the two-stage countercurrent leaching process indicate that under suitable conditions, the total sulfuric acid dosage is 15%, the residual acid mass concentration of leaching solution is 48.8 g/L, and the molybdenum leaching rate calculated by leaching residue remains above 71%. This process proves stable and reliable with good reproducibility of leaching indexes, which serves as the technical basis for the industrial design of this molybdenum deposit.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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