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Outline
Erbium oxide (Er2O3) with a relative purity of 99.99% was separated and purified at room temperature (25 ℃) by ion exchange, and effects of acidity and flow rate of eluent on the separation and purification were investigated. Two ion exchange columns were connected in series, and hydrochloric acid with acidity of 1.5 mol/L was taken as the eluent at a flow rate of 5 L/h in column 1 and 10 L/h in column 2. After separation and purification under the above optimal conditions, erbium oxide had a relative purity greater than 99.999 9%, with the total content of rare earth impurities less than 1 μg/g. This study provides an effective process, featuring low energy consumption, short flow and low costs, for separation and purification of heavy rare earths.
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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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