Preparation method of high-purity tungsten powder
A high-purity, tungsten powder technology, applied in the field of preparation of high-purity tungsten powder, can solve the problems of small reduction furnace, high cost and long process of quartz furnace tube, so as to save the calcination step, increase the output and reduce the introduction volume effect
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[0032] A preparation method of high-purity tungsten powder, comprising the steps of:
[0033] (1) Dissolving 1000kg of commercial grade 0 ammonium paratungstate ammonium paratungstate at 70-90°C in a 10wt% ammonia solution (the dissolution time is 4-8h, and the dissolved tungstic acid concentration is 300g / L), and Filter to remove the alkaline insoluble residues of iron, calcium and other elements to obtain ammonium tungstate solution with pH=9-11;
[0034] (2) Evaporate and crystallize the ammonium tungstate solution obtained in step (1) in the reaction kettle under the conditions that the internal pressure is lower than one atmospheric pressure, pH=7-8 and temperature is 95-105°C, and the tungsten in the mother liquor to be crystallized When the acid concentration reached 20g / L, the crystallization was stopped, and the crystallization rate at this moment reached 92%, and the material containing the mother liquor of crystallization was obtained;
[0035] (3) Filter the mater...
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