| 摘要 |
PROBLEM TO BE SOLVED: To obtain Mo powder having uniform grains, nallow in a size distribution, high in density, small in coagulation and free from coarse grains by doping a molybdenum raw material with specified amounts of K or K and P, executing reduction and regulating its density to specified apparent one. SOLUTION: A molybdenum raw material or a molybdenum intermediate raw material is doped with K or I and P so as to contain K of 250 to 510 ppm/Mo or K of 250 to 510 ppm/Mo and P of 70 to 170 ppm/Mo. This molybdenum raw material is reduced to obtain molybdenum powder. As the molybdenum raw material, molybdenum trioxide, ammonium molybdate or the like are used, and, as the molybdenum intermediate raw material, molybdenum oxide such as MoO2 is used. In this way, uniformly grained molybdenum having >=2.2 apparent density by the measuring method for apparent density in accordance with the tungsten-molybdenum Industrial Standard TMS 1101 and >=4.5 density by the measuring method for tap density can be obtd. Relating to the powder, there is no grains of >2.2μm in the size distribution, and its coagulating coefficient is <=1.5.
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