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Outline
A process consisting of reduction roasting and sulfuric acid leaching was adopted to extract manganese from manganese nodules, and the microstructure evolution and phase transformation during the processes from raw ore, roasting to sulfuric acid leaching were explored. It is found that the reduction rate of manganese can reach 99.29% after 2 h reduction process at 750 ℃. After 6 h leaching with 0.5 mL/g of sulfuric acid at 60 ℃, the leaching rate of manganese is 90.53%. It is shown that part of manganese replaces iron to form acid-insoluble minerals such as jarosite and manganese-iron olivine, which are difficult to be leached out. This study provides a technical reference for preparing electrolytic manganese with low-grade manganese nodules.
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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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