Ammonium paratungstate preparation method
The invention discloses an ammonium paratungstate preparation method. The method in the embodiment of the invention comprises the following steps: mixing a hydrochloric acid solution with diatomite, and heating the obtained mixture to obtain a diatomite-containing hydrochloric acid solution; adding...
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| Format: | Patent |
| Sprache: | chi ; eng |
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| Zusammenfassung: | The invention discloses an ammonium paratungstate preparation method. The method in the embodiment of the invention comprises the following steps: mixing a hydrochloric acid solution with diatomite, and heating the obtained mixture to obtain a diatomite-containing hydrochloric acid solution; adding a sodium tungstate solution to the diatomite-containing hydrochloric acid solution, and stirring the solutions to obtain a tungstic acid precipitate-containing mixed solution; carrying out primary filtering treatment on the tungstic acid precipitate-containing mixed solution to obtain a tungstic acid and diatomite mixture; mixing the tungstic acid and diatomite mixture with ammonia water to obtain a diatomite-containing ammonium tungstate solution; carrying out secondary filtering treatment on the diatomite-containing ammonium tungstate solution to obtain diatomite and an ammonium tungstate solution; and carrying out evaporating and crystallizing treatment on the ammonium tungstate solution to obtain ammonium parat |
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