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Outline
In the paper, it is studied the preparation of cerium hydroxide with cerium chloride solution as raw material as well as investigated the concentration of cerium chloride solution, quantity of H2O2 added, amount of NH3·H2O and the effects of reaction temperature on oxidation rate of cerium in cerium hydroxide to determine the optimum technological conditions. The results showed that the cerium hydroxide with oxidation rate of cerium greater than 97%, w(Cl-)<0.15% and could be dissolved in HNO3 solution was obtained when the mass concentration of cerium chloride was 120 g/L, amount of H2O2 was 0.7 times of mass of CeO2, amount of NH3·H2O was 130% of theoretical mass and reaction temperature was at 50 ℃.
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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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