Preparation of High Purity Spherical Tungsten Grains

The present invention relates to a method for preparing high purity spherical tungsten particles, comprising the steps of: (a) calcining of ammonium paratungstate spherical having 6 to 12 hours at a high temperature of 1000 ℃ ~ 1250 ℃ prepared tungsten oxide; (2) tungsten oxide were reduction, the reduction temperature is 1250 ℃ ~ 1450 ℃, the reduction time of 10 to 12 hours, the hydrogen purity of 99.99%, a dew point of -83 ℃, under the environment of reducing the amount of the boat; After ball milling (3) reduction in a reductive elimination of produced during agglomeration and caking, and to obtain a uniform dispersion of spherical tungsten particles; (4) via spherical tungsten particles were then sieved after ball milling process to obtain high purity spherical tungsten particles.

Particle size of the spherical high-purity tungsten of the present invention is prepared by 0.1 ~ 2mm, a purity greater than 99.95%, the spherical rate is greater than 97%.


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