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With nickel removal solution after copper electrolysis taken to be a substitute for sulfuric acid as the leaching agent, a processing technique consisting of oxygen pressure acid leaching, evaporative crystallization and reduction by SO2 was adopted to realize utilization of arsenic matte resource. The results show that with sulfuric acid concentration at 120 g/L, leaching temperature of 120 ℃, oxygen partial pressure of 0.8 MPa, liquid-solid ratio of 7∶1 and leaching time of 2 h, the leaching rates of copper, arsenic and antimony from arsenic matte can reach 97.99%, 94.68% and 17.28%, respectively, showing an efficient leaching of copper and arsenic from matte copper and selective separation of antimony can be actualized. The solution obtained from pressure acid leaching was then subjected to vacuum evaporation followed by natural cooling for crystallization, leading to the precipitation of copper sulfate. And then reduction by SO2 was adopted to prepare arsenic trioxid using mother liquor, leading to the obtained copper sulfate with purity up to 98.12% and the obtained arsenic trioxide with purity up to 99.49%.
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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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