Method for Producing High-purity Tungsten Powder

The present invention relates to a method for manufacturing a phosphorus content of less than 1 ppm by weight of a high-purity tungsten powder, wherein the ammonium tungstate solution in accordance with the amount of the tungsten inclusions are translated ppm by weight of a phosphorus-containing impurities as the starting material above , by the following 50 ℃ using hydrochloric acid in which and the pH was adjusted to 4 and less than 7, so that eleven hydrated ammonium paratungstate crystalline precipitate, which was further heated to 70 ~ 90 ℃, filtered at a high temperature to obtain a pentahydrate crystals of ammonium paratungstate, and then the crystals of ammonium paratungstate pentahydrate obtained tungsten oxide calcined, and the hydrogen reduction of tungsten oxide to obtain a high-purity tungsten powder.

The present invention also relates to a phosphorus content of 0.4 ppm by weight of high-purity tungsten powder manufacturing method is characterized in that, in the use of hydrochloric acid and the pH adjusted to 4 steps or more and 6 or less, and follow the same procedure to give high purity tungsten powder. Accordingly, the phosphorus content can be effectively reduced.

A phosphorus content of less than I ppm by weight of the manufacturing method of high-purity tungsten powder, wherein the amount of tungsten inclusions in accordance with the translation of phosphorus-containing impurities I ppm or more by weight of ammonium tungstate solution as a starting material, By below 50 ° C with hydrochloric acid to which, and the PH was adjusted to 4 and less than 7, so that eleven hydrated ammonium paratungstate crystalline precipitate, which was further heated to 70 ~ 90 ° C, filtered at the heating temperature state pentahydrate obtained crystals of ammonium paratungstate, and then the crystalline pentahydrate paratungstate tungsten oxide obtained by calcining, and the hydrogen reduction of tungsten oxide to obtain a high-purity tungsten powder.

A manufacturing method of a phosphorus content of 0.4 ppm by weight of a high-purity tungsten powder, wherein the ammonium tungstate solution in accordance with the amount of the tungsten inclusions are translated by weight PPm I phosphorus containing impurities as the starting material in the above By 50 ° C and less hydrochloric acid for neutralization to adjust the pH to 4 or more and 6 or less, so that eleven hydrated ammonium paratungstate crystalline precipitate, which was further heated to 70 ~ 90 ° C, filtered at the heating temperature condition pentahydrate obtained by crystallization of ammonium paratungstate, and then the crystalline pentahydrate calcining ammonium paratungstate obtained tungsten oxide, tungsten oxide and the reduction with hydrogen and made of high-purity tungsten powder.




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