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In an experiment, oxidative precipitation method was adopted to remove iron from crude nickel sulphate solution. With H2O2 or Cl2 as oxidant, Fe2+ in the solution was oxidized to Fe3+, and then Fe3+ was precipitated in the form of Fe(OH)3 and FeOOH by adjusting the pH of the solution. It is found that under the optimum conditions for iron removal with H2O2 as the oxidant, including H2O2 dosage of 3.84%, temperature of 75 ℃, pH of 4.5, dropping of H2O2 solution at a rate of 0.33 mL/min, and the aging time of 90 min, the removal rate of iron can reach 99.74%. Under the optimal conditions for iron precipitation with Cl2 as oxidant, including reaction temperature of 70 ℃, pH of 4.5, Cl2 injection time of 60 min and aging time of 90 min, the iron removal rate can reach 99.72%. It is shown that the solution after iron removal with H2O2 or Cl2 as an oxidant can have the iron content therein up to the class I standard (iron content no more than 0.000 5%) in GB/T 26524—2023 Refined Nickel Sulfates.
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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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