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Recovery of magnesium from magnesium-containing wastewater and the preparation of high-purity magnesium oxide by ammonification carbonization method were studied. The effects of carbonization temperature, initial mass concentration of magnesium, CO2 partial pressure, stirring speed, thermal decomposition temperature and time, and calcination temperature on the magnesium recovery process were investigated. The results show that under the conditions of carbonization temperature of 23 ℃, initial mass concentration of magnesium of 15.4 g/L, CO2 partial pressure of 0.6 MPa and stirring speed of 560 r/min, the complete carbonization can be achieved by controlling the carbonization end point pH=7 and carbonization time 20 min. In the thermal decomposition stage, the basic magnesium carbonate with good crystal morphology can be obtained at 90 ℃ for 90 min. After further calcination at 700 ℃ for 2 h, the magnesium oxide product with high crystallinity and purity of 99.55% is finally obtained, and its performance can meet the standard requirements of 'industrial light magnesium oxide' (HG/T 2573—2012).
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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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