Technique for Producing Tungstic Acid

This technique describes that the commercial sodium tungstate solution is added by H2O2 as complex agent, was decomposed directly into tungstic acid by sulfur dioxide, sulfite or bisulfite in low acidic hydrogen chloride of 0.5-2N at room temparature 10-28 deg.. This technique has abolished some processes like the remove of Mo and CaWO4 comparable to traditional process. It reduces the amounts of consuming-acid, consuming-energy and polution. The tungstic acid product is powder type, high purity, high activity and converted easity into other tungstate products. The yield of tungstic acid was about 98%, 10% higher than traditional one.

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