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The separation and recovery of magnesium and nickel from serpentine and the co-mineralization of CO2 using green vitriol roasting—water leaching—ammonium carbonate precipitation process was investigated. The effects of roasting temperature, green vitriol to serpentine mass ratio and roasting time on the leaching rates of magnesium and nickel during sulfuric acid roasting were examined. Additionally, the influence of ammonium carbonate concentration and mineralization temperature on the precipitation rates of magnesium and nickel in the leachate during the mineralization reaction(resulting in the formation of magnesium carbonate precipitate) was evaluated. The effects of ammonium carbonate concentration and mineralization temperature on the precipitation behavior of metal ions and the microstructure of the precipitates were also explored. The results demonstrate that under the optimal roasting conditions of temperature of 670 ℃, green vitriol to serpentine mass ratio of 5/1, and roasting time of 90 min, the leaching rates of magnesium and nickel can reach 89% and 85%, respectively. During the mineralization reaction, with an ammonium carbonate mass concentration of 150 g/L and mineralization temperature of 80 ℃, the precipitation rate of Ni2+ is less than 5%, while Mg2+ and Fe3+ precipitate at rates of 97% and 100%, respectively. With the increase of the mass concentration of ammonium carbonate, the precipitate transforme from Ni6Fe2(CO3)(OH)16•4H2O to MgCO3•3H2O, and then to (NH4)2Mg(CO3)2•3H2O. With the increase of mineralization temperature, the precipitate gradually shifted from (NH4)2Mg(CO3)2•3H2O to Mg5(CO3)4(OH)2•4H2O. The morphology of the magnesium carbonate precipitate is rod-like at low temperatures and plate-like at high temperatures. The experimental results can provide a novel approach for nickel extraction from serpentine, CO2 reduction processes, and the efficient utilization of waste ferrous sulfate.
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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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