Research on the Process of Preparing High-Purity Ammonium Dimolybdate from Industrial Molybdenum Oxide by Extraction Method AITranslate

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Chinese Library Classification Number:TF841.1[冶金工程]

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In view of the current situation of low-purity of ammonium dimolybdate prepared by existing ex-traction processes from industrial molybdenum oxide,the process of extracting and purifying industrial mo-lybdenum oxide alkaline leachate with primary amine N1923 was investigated,and the effects of various ex-traction and stripping conditions on Mo extraction rate,stripping rate,and ammonium dimolybdate purity were explored.The results show that under the optimized single-stage extraction conditions of room tem-perature,pH value adjustment of the alkaline leachate to 4 through sulfuric acid addition,organic phase composition of 40%N1923+20%isoamyl alcohol+40%sulfonated kerosene,O/A ratio of 1∶1,and extraction time of 3 min,the Mo extraction rate exceeds 94%.Under the conditions of 9%ammonia solu-tion as the stripping agent,O/A ratio of 3∶1,three-stage stripping,room temperature,and stripping time of 3 min,the Mo stripping rate reaches 98%.Ammonium dimolybdate product with a purity of up to 99.99%is obtained by evaporating and crystallizing the stripping solution.However,due to its high tung-sten content,further targeted tungsten removal is required in subsequent steps.