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Outline
Aiming at the three wastes problem existing in the traditional hydrometallurgical tungsten smelting process, based on the analysis of the complexation coordination characteristics of oxalic acid and tungstic acid, the selective extraction of tungsten from crude tungstic acid using oxalic acid was studied. To clarify the dissolution reaction kinetics mechanism of tungstic acid in oxalic acid, taking pure tungstic acid as the research object and oxalic acid solution as the leaching agent, the dissolution rules of tungstic acid under different temperatures, oxalic acid concentrations and stirring speeds were investigated. The dissolution kinetics of tungstic acid in oxalic acid solution was studied by the equal leaching rate method. The results show that the apparent activation energy of this reaction is 48.9 kJ/mol. Controlled by the chemical reaction, the reaction order of oxalic acid concentration is 1.103 5.
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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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