Method for Recovering Tungsten From Tungsten-containing Fluorite Mine

The invention relates to a method for recovering tungsten from tungsten-containing fluorite mine.

Sulfuric acid and tungsten-containing fluorite mine are mixed at a mass ratio of 0.8:1 to 1.5:1, cured, and then roasted at 200-500 DEG C, a fluorite mineral is subjected to acidolysis by sulphuric acid to release hydrogen fluoride (HF), a tungsten mineral is subjected to acidolysis by sulphuric acid to become tungsten trioxide, and the HF and the tungsten trioxide continue to react to generate tungsten hexafluoride (WF6) or tungsten oxytetrafluoride (WOF4); the HF, the WF6 and the WOF4 are all volatile matters and enter roasted flue gas, the flue gas is washed, absorbed and hydrolyzed to obtain tungstic acid, the washed gas is used for producing hydrofluoric acid, and the volatilization rate of fluorine can be higher than 95% while the volatilization rate of tungsten can be higher than 90%.

The method for recovering tungsten from tungsten-containing fluorite mine has the advantages that when hydrogen fluoride is prepared, tungsten is fluorated and volatilized and then enters flue gas to achieve high-efficiency extraction of tungsten; the method can be used to treat mixed concentrate produced by bulk flotation of tungsten and fluorite, a flotation-metallurgical process is greatly simplified, and a comprehensive recovery rate is increased.




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