论文部分内容阅读
以仲钼酸铵(优级纯)为原料,通过气流式雾化干燥结合微波煅烧氢还原法制备出微米级球形钼粉。重点研究雾化造粒过程和微波煅烧氢还原阶段的升温速率对最终Mo粉的形貌、粒度以及比表面积的影响及规律。结果表明,控制一定的工艺参数可以制备出微米级球形、分散性好的钼酸铵前驱体粉末。微波煅烧氢还原的升温速率越低,制备的Mo粉破碎越严重,且有少量团聚现象。升温速率越高,制备的Mo粉球形度越高,分散性越好。升温速率也直接影响平均粒度和比表面积,升温速率越低,平均粒度越小,而比表面积越大;升温速率越高,平均粒度相应越大,比表面越小。
Ammonium paramolybdate (excellent grade pure) was used as raw material to prepare micron-sized spherical molybdenum powder by air atomization and atomization drying combined with microwave calcination hydrogen reduction method. The effects of the atomization granulation process and microwave heating calcination temperature on the morphology, particle size and specific surface area of the final Mo powder were investigated. The results show that the control of certain process parameters can be prepared micron-level spherical, dispersible ammonium molybdate precursor powder. The lower the heating rate of microwave calcination hydrogen reduction, the more severe the preparation of Mo powder, and a small amount of agglomeration phenomenon. The higher the heating rate, the higher the spherical Mo powder prepared, the better the dispersion. The heating rate also directly affects the average particle size and specific surface area. The lower the heating rate, the smaller the average particle size and the larger the specific surface area. The higher the heating rate, the larger the average particle size and the smaller the specific surface area.