Method for Preparing Nano-tungsten Powder From Calcium Tungstate

The present invention provides a method for the preparation of nano calcium tungstate tungsten powder.

Comprising the steps of: calcium tungstate is made in close contact with the conductive metal cathode electrolysis, in soluble or insoluble anode material is ancillary to CaCl2 mixture with other alkali metal or alkaline earth metal in an electrolyte; electrolyte set sealing the cell may be heated in water to remove the electrolyte temperature, then heated to the reaction temperature under an inert atmosphere to protect the electrolysis; After the reaction was completed, the electrolyte is heated under an inert atmosphere, into the cathode immersed in the molten salt, and washed to remove residual impurities; remove the cathode product, deionized water to remove surface residual electrolyte soaked, then dried under vacuum to obtain nano-tungsten powder.

The present invention solves the existing differential deposition of tungsten powder molten salt electrolysis of molten salt electrolysis quality and solid-state direct reduction of post-electrolysis speed slow enough.


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