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An experiment study was carried out on a processing technique of reduction leaching of pyrolusite with acidic wastewater from steel mills as the reductant, for comprehensive utilization of pyrolusite and acidic wastewater of steel mills. The results show that 3 hours of leaching at 90 ℃, with FeCl2 and MnO2 in a mass ratio of 2.2, liquid-solid ratio of 11∶1 and the acid wastewater at an initial concentration of 2.5 mol/L, can result in the leaching rates of Mn, Fe and Al from the pyrolusite at 97.14%, 95.37% and 41.33%, respectively. And then, Fe3+ in the leachate is reduced with scrap iron at an amount of 1.1 times the theoretical amount at a temperature of 80 ℃ for 50 min, leading to the reduction rate of Fe3+ up to 99.85%. After Fe3+ is reduced to Fe2+, the Fe2+-containing reducing solution is returned for leaching again, presenting stable leaching results. It is shown that the average leaching rates of Mn, Fe and Al from pyrolusite are 96.75%, 95.31% and 41.18%, respectively.
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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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