Preparation Of Ultrafine Powder Activated Molybdenum Reduction
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- Category: Molybdenum knowledge
- Published on 14 August 2014
- Written by ling
- Hits: 423
Currently, the method of the preparation of ultrafine molybdenum powder are: evaporation state trioxide reduction, activation reduction and twelve Ammonium hydrogen reduction method. Now briefly introduced activation reduction method .
Activation reduction to ammonium heptamolybdate as raw materials in the catalysis of ammonium chloride, ultra-fine molybdenum powder prepared by the reduction process, the restore process completely volatile chloride. Restore process is broadly divided into thermal decomposition of ammonium chloride, ammonium heptamolybdate decomposed into molybdenum trioxide and hydrochloric acid reaction produces molybdenum dichloride (MoO2Cl2), MoO2Cl2 is hydrogen reduction for ultra-fine molybdenum powder 4 stage. This method than the traditional method of lowering the reduction temperature of about 200 ~ 300 ℃, but only used once the restore process, the process is relatively simple. Molybdenum powder having an average particle size prepared in this manner is 0.1 μm, and the powder has a good sintering performance. Lingnan University in Korea made a similar method, except that the materials used for high-purity molybdenum trioxide.
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