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Process for the preparation of ammonium paratungstate hydrates and ammonium paratungstate decahydrate
Process for the preparation of ammonium paratungstate hydrates and ammonium paratungstate decahydrate
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机译:制备仲钨酸铵水合物和十水合仲钨酸铵的方法
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摘要
The invention is directed to a process for the continuous preparation of ammonium paratungstate hydrate by back reextraction of a tungsten-laden organic phase with an ammonia-containing aqueous solution in a mixer-settler apparatus. The reextraction is carried out at an NH3:W molar ratio of from 0.83 to 1.30, and a volume feed ratio of the tungsten-laden organic phase to the ammonia-containing aqueous solution of from 5 to 25. The above crystalline is in high purity and in high yield. The production method can be carried out in a simple and energy-efficient manner.
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