A chrysoberyl-type beryllium ore from Xinjiang, containing 0.102% Be with quartz as the dominant gangue mineral, was taken in an experimental study on sulfuric acid leaching. According to the Box-Behnken experimental design principle, a multivariate regression equation was established by using response surface methodology (RSM) for three influencing factors of leaching effect, including liquid-solid ratio, leaching time and leaching temperature, as well as their interactions. Based on the test of significance of regression equation, the optimum process conditions were determined as follows: roasting temperature of 900 ℃, roasting time of 3 h, sulfuric acid concentration of 50%, liquid-solid ratio of 3.2∶1, leaching time of 4.8 h and leaching temperature of 90 ℃. Under these conditions, the Be leaching rate is predicted to be 89.73%, and an average value is 89.10% based on three parallel experiments, indicating that the established model is accurate. A kinetic model of leaching revealed that the leaching process was controlled by interfacial chemical reactions, with an apparent activation energy at 50.42 kJ/mol.
| 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 |