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The recovery of calcium and silicon from steel slag by acid-base synergistic separation method was studied. The effects of leaching agent concentration, temperature, leaching time and liquid volume to solid mass ratio on the leaching rate of calcium and silicon in steel slag were investigated. The leaching rules under different leaching conditions were investigated. The results show that the leaching concentration, time, and liquid volume to solid mass ratio significantly influence the leaching rate of calcium and silicon, and temperature has no significant effect. Under the conditions of hydrochloric acid concentration of 0.75 mol/L, leaching time of 30 min, temperature of 25 ℃, and liquid volume to solid mass ratio of 10∶1, the calcium leaching rate is 53.74%, and the resulting calcium oxalate purity can reach 98.94%. Under the conditions of sodium hydroxide concentration of 1.5 mol/L, temperature of 95 ℃, leaching time of 120 min, and liquid volume to solid mass ratio of 20∶1, the silicon dioxide leaching rate is 43.22%, and the purity of the resulting silicon dioxide can reach 80.85%. The method can effectively separate and recover calcium and silicon from steel slag, and realize resource utilization.
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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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