Experimental Study on Molybdenum Reduction from Ammonium Paratungstate by Washing
The preparation of high purity ammonium paratungstate not only has important economic value,but also has great strategic significance.Reasonable control of molybdenum content in ammonium para-tungstate and guarantee of product pass rate are the key to affect the development and economic benefits of enterprises.The effects of washing water pH value,washing temperature,washing time,liquid-solid ratio and washing frequency on the elution rates of molybdenum and tungsten were studied by single factor tests.The results show that the optimal conditions for molybdenum reduction from ammonium paratung-state by washing with pure water are washing water pH value of 7.0,reaction time of 20 min,reaction tem-perature of 65℃,liquid-solid ratio of 3∶1 and washing frequency of once.At this time,the elution rate of molybdenum reaches 82.01%,and the loss of tungsten is small with an elution rate of 3.97%.This method has the advantages of no other impurities,simple operation,environmentally friendly process and low pro-duction cost,and has certain reference value and significance for enterprise development and process im-provement of ammonium paratungstate preparation.
ammonium paratungstatewashing with pure waterelution ratemolybdenumtungsten
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