缺碳预还原MoO_(3)+氢气深脱氧工艺制备超细钼粉

Preparation of ultrafine Mo powders byMoO_(3) pre-reduction with insufficient carbon and hydrogen deep reduction

以炭黑为还原剂还原MoO_(3)制备存在少量MoO2的预还原Mo粉,然后对预还原Mo粉进行氢气深还原,成功制备出平均粒径为99~190 nm的超细钼粉,研究了碳热还原温度对Mo粉平均粒度和残碳量的影响。结果表明,在同一还原温度下,当C/MoO_(3)摩尔比从2.0增加到2.1时,产物的粒径变化很小。碳热还原温度对产物粒径和纯度有显著影响。当C/MoO_(3)摩尔比为2.1时,还原温度从950℃增加到1150℃,氢还原后钼粉的平均粒径从100 nm增加到190 nm,且残碳量(质量分数)由0.030%降低到0.009%。

The pre-reduction molybdenum powders containing minor amount of MoO2 were prepared by the carbothermic reduction of MoO_(3),using the carbon black as the reducing agent,then the obtained pre-reduction molybdenum powders were deep reduced by hydrogen to finally prepare the ultrafine molybdenum powders with the average particle size of 99 nm to 190 nm.The effects of the carbothermic reduction temperature on the particle size and the residual carbon content by mass of the ultrafine molybdenum powders were studied.In the results,with the increase of C/MoO_(3)molar ratio from 2.0 to 2.1,the particle sizes of the ultrafine molybdenum powder products change little at the same reduction temperature.But the carbothermal reduction temperature shows a significant effect on the particle size and purity of products.When the C/MoO_(3)molar ratio is 2.1,with the increase of reduction temperature from 950℃to 1150℃,the average particle sizes of products increase from 100 nm to 190 nm,and the content of the residual carbon by mass decreases from 0.030%to 0.009%after the hydrogen reduction.