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The leaching of manganese from low-grade manganese carbonate ore by sulfuric acid without reducing agent was studied. The effects of key parameters such as mineral particle size, sulfuric acid concentration and liquid volume to solid mass ratio on the leaching rate of manganese were investigated by single factor test, and the cyclic leaching process was optimized. The results show that under the conditions of ore particle size －300 μm－+150 μm proportion ≥ 95%, sulfuric acid concentration of 5.5 mol/L, reaction temperature of 60 ℃, each cycle leaching time of 30 min, liquid volume to solid mass ratio of 4∶1, and 4 extraction cycles of leaching, the average leaching rate of manganese is 98.35%, and the mass concentration of manganese in the leaching solution is 101.62 g/L. The proportion of manganese and impurities in the leaching solution is coordinated, and the solution composition is equivalent to the solution composition obtained by the leaching of imported manganese carbonate ore, which can provide qualified feed solution for the next step of manganese deep processing.
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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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