Tungsten hydrometallury tends to emphasize the use of extraction and sorption methods when converting sodium tungstate solutions. Most existing extraction flowsheets are based on extracting tungsten from acid solutions, using ternary amines [1]. One way to improve the tungsten extraction technology is to switch to widespread' use of alkaline methods of decomposing tungsten products. In earlier studies [2] the possibility was indicated of extracting tungsten from alkaline media using of quaternary ammonium compound (QAC). in [3], a quantitative series was established for the exchange extraction of anions CO_3~(2-) < SO_4~(2-) < WSO_4~(2-) with trialkylmethylammonium solutions (TABAKh). The observed difference in exchange constants is sufficient to make a quantitative extraction of tungsten and molybdenum from carbonate solutions. When the HCO_3 ion is in a solution, tungsten extractability will be sharply reduced [2, 4].
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