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Process for treating tungstate solutions to reduce molybdenum impurity and other impurity content
Process for treating tungstate solutions to reduce molybdenum impurity and other impurity content
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机译:处理钨酸盐溶液以减少钼杂质和其他杂质含量的方法
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摘要
Tungstate solutions are purified by a precipitation process followed by two anion exchange processes to reduce molybdenum and arsenic impurity content. The precipitation involves acidification of the original highly basic tungstate solution to pH of 7 to 10 without addition of precipitating agents and separates out the bulk of impurities other than Mo, As. The first anion exchange process removes As. Then a remaining filtrate from the latter process is treated with sulfides to form thiomolybdates from impurity Mo content and the thiomolybdates are then separated out from the tungstate solution in a second anion exchange process.
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