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A technique consisting of acid leaching, oxidative precipitation for impurity removal, and solvent extraction was adopted to effectively separate and recover nickel from high-nickel electroplating sludge, and then high-purity nickel sulfate hexahydrate was prepared. Firstly, the sludge was leached with sulfuric acid, and most of nickel, copper, iron and aluminum in the sludge were leached out in the leachate; then, hydrogen peroxide was added to the leachate for oxidation and precipitation to remove iron therein, and the suitable endpoint pH value was 3; after that, sodium sulfide with an appropriate excess coefficient of 1.2 was added to remove impurities therein, resulting in the precipitation rates of Fe and Cu reaching 99.43% and 98.13% respectively; by adjusting the pH value of the precipitated solution, nickel hydroxide was precipitated and then dissolved with sulfuric acid into nickel sulfate solution, which was extracted with P204 for deep removal of impurities. As a result, the secondary extraction rates of Cu, Fe and Al were up to 98.41%, 99.99% and 95.15% respectively, and the extraction rate of Ni was just 9.4%. The obtained raffinate was subjected to evaporation concentration, followed by cooling crystallization, and a nickel sulfate hexahydrate with purity exceeding 99.95% was finally prepared.
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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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