A Method for Decomposing Method Scheelite

A method for decomposition of scheelite, using a concentration of hydrochloric acid and a certain proportion of phosphoric acid complex decomposition, decomposition of the tungsten heteropoly acid form directly into the decomposing solution; and filtered to obtain a filtrate, the filtrate was extracted using the phosphorus N235 tungsten heteropolyacid; after extraction and separation, loaded organic phase with NaOH were stripping, raffinate Shen added calcium sulfate, and filtered to give hydrochloric acid recycling; stripping the organic phase was recycled, after stripping solution pH adjusted by acidification evaporation-crystallization available phosphorus sodium tungstate crystals. Advantages of the present invention is to change the traditional acid decomposition scheelite single idea, using hydrochloric acid, phosphoric acid complex decomposition of scheelite, a tungsten leaching rate increase; the concentration of tungsten extraction method using processing scheelite decomposition solution to improve the reduces the water consumption of tungsten smelting process, is conducive to the entire process of the water cycle; Shen calcium realized sulfuric acid decomposition reagent regeneration, greatly reducing the cost of production; phosphotungstic heteropoly salt prepared very versatile.




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