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| New Process to Prepare Tungsten Powder from Ammonium Paratungstate with One-step Reduction |
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Received:June 19, 2014
Revised:June 23, 2014
Accepted:June 24, 2014
Published Online:October 15, 2014
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| DOI：10.3969/j.issn.1007-7545.2014.11.013 |
| KeyWord:ammonium paratungstate; one-step process; hydrogen reduction; tungsten powder |
| Author | Institution |
| WANG Ya-xiong |
昆明贵金属研究所 |
| DONG Hai-gang |
昆明贵金属研究所 |
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| Abstract: |
| One-step reduction process to prepare tungsten powders with ammonium paratungstate as raw material by subdivision control of reducing atmosphere was studied. The effects of particle size of ammonium paratungstate, reducing atmosphere, temperature, time and raw materials load on particle size and morphology of tungsten powders were investigated. The results show that the optimum process parameters include raw materials load of 50 g, hydrogen flow of 32 L/h, heating rate of 10 ℃/min, holding at 500 ℃ of 20 min, holding at 900 ℃ of 1.5 h, and air cooling to 100 ℃. The yield rate of tungsten powder is 98.5% above. One-step reduction process has the advantages of controllable product size and low production cost. |
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