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Outline
Aiming at the problem of excessive arsenic content in zinc concentrate and low grade of arsenic concentrate in a zinc polymetallic mine in Inner Mongolia, the flotation process of copper, zinc and arsenic was systematically studied. The combination of lime, sodium humate and zinc sulfate was used to inhibit arsenic-sulfur minerals, ethyl xanthate and Z-200 were used as combined collectors to enhance the selectivity of copper flotation. During the zinc flotation stage, the lime and NY were used as inhibitors to inhibit arsenic, the copper sulfate was used to activate sphalerite, and the collector ZC was used to improve the recovery rate of zinc. In the arsenic flotation stage, the copper-zinc flotation tailings were further finely ground(－0.074 mm accounts for 68.10%), and the arsenic recovery rate was improved by reagents combined with sulfuric acid, sodium silicate and copper sulfate. Copper concentrate with a grade of 29.35%, recovery rate of 82.17% and arsenic content of 0.46% are obtained through preferential flotation process. The zinc concentrate grade is 46.85%, the recovery rate is 86.34% and the arsenic content is 0.52%. The arsenic concentrate contains arsenic grade of 32.20% and recovery of 87.94%. When the grinding fineness is optimized to－0.074 mm accounts for 80.13%, the dissociation degree of copper-zinc minerals is significantly improved. Compared with the original beneficiation process, the arsenic content of copper-zinc concentrate is greatly reduced. The research results provide technical reference for solving the difficult problem of beneficiation of high arsenic-zinc polymetallic ores.
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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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