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Outline
A two-stage sulfuric acid leaching coupled with iron salt arsenic precipitation process was proposed to recovery valuable metals from copper smelting dust. The effects of initial mass concentration of sulfuric acid, liquid-solid ratio, reaction temperature and leaching system on the leaching rates of various metals in the first-stage leaching were systematically investigated; the effects of initial sulfuric acid concentration in the second-stage leaching on the total leaching rates of each metals were also studied under atmospheric pressure and oxygen pressure conditions, respectively. Meanwhile, the effects of different oxidants on the precipitation rates of arsenic and iron were explored for arsenic removal from leachate. It is found that the first-stage leaching at 70 ℃ for 2 h, with a single sulfuric acid system at an initial mass concentration of 50 g/L and a liquid-solid ratio of 4 mL/g, can bring the leaching rates of arsenic, copper, zinc and indium at 82.11%, 75.77%, 60.23% and 5.76%, respectively. And the second-stage leaching, performed at atmospheric pressure at 95 ℃ for 2 h with sulfuric acid at an initial mass concentration of 150 g/L and a liquid-solid ratio of 4 mL/g, results in the total leaching rates of zinc, copper, indium and arsenic up to 98.84%, 93.31%, 95.55% and 82.14%, respectively. With an oxygen flowrate of 250 mL/min, pH value of 1.5, Fe and As in a molar ratio of 1, the precipitation rates of arsenic and iron can reach 84.00% and 78.00%, respectively after 2 h reaction at 90 ℃. It is concluded that the proposed process can achieve efficient leaching of valuable metals and arsenic stabilization, providing technical support for clean treatment of flue dust.
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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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