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Aiming at the difficulty in separating and recovering copper and cobalt from iron-cobalt-copper alloys, a process was proposed to leach iron and cobalt from the alloy with low-concentration sulfuric acid, separate copper, and then separate iron and cobalt by oxygen pressure hydrolysis to prepare iron oxide. The effects of various factors on the low-concentration acid leaching and the separation of iron by oxygen pressure hydrolysis were investigated. The results show that the leaching rates of iron and cobalt are 98.57% and 99.21%, respectively, and the copper leaching rate is only 0.3% after 4 times of leaching, under the conditions of sulfuric acid concentration of 30 g/L and liquid volume to solid mass ratio of 10∶1. Under the conditions of oxygen partial pressure of 0.4 MPa, reaction temperature of 180 ℃, stirring speed of 400 r/min and reaction time of 120 min, the hydrol ysate is mixture of FeOOH and Fe2O3, the iron content is more than 58%, the iron immersion rate was about 92%, the cobalt recovery rate is more than 99.5%, and the sulfuric acid yield is 96.41%. The method realizes the separation of iron, cobalt and copper in iron, cobalt and copper alloys, and recycles the sulfuric acid produced during the hydrolysis process, which can offset the sulfuric acid consumption in the leaching process and greatly increase the cobalt concentration in the solution. The results of this study have important reference value for the wet separation of iron-based alloys containing valuable metals such as copper and cobalt.
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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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