工艺参数控制对钼粉粒度分布的影响研究

Effect of processing parameter on particle size distribution of-molybdenum-powder

通过变化MoO3原料粒度、一次和二次还原参数,采用费氏粒度仪和Mastercizer2000型激光粒度分析仪评价还原后的钼粉平均粒度和粒度分布组成。结果表明:MoO3原料粒度与还原后钼粉粒度和粒度分布之间不存在直接的线性关系,原料粒度分布越宽还原后的钼粉平均粒度越小;一次还原MoO3料层厚度增大,还原后钼粉的粒度也增大,粒度分布变宽,D(0.5)值略微减小;氢气露点升高,还原后钼粉的粒度大,粒度分布宽,D(0.5)值也较大;二次还原温度越低,钼粉的粒度越小,但还原温度变化对粒度分布的影响较小。料层厚度增加、氢气流量减小,还原后的钼粉粒度均增大,粒度分布曲线右移。

By changing the particle size of MoO3 powder, the first reduction and the second reduction parameters, The mean particle size and particle size distribution composition of the reduced molybdenum powder were investigated with Fisher Sub-Sive Sizer instrument and Mastercizer2000 laser granularity analyzer. The results show that there is no direct linear relationship between the particle size of MoO3 powderand the particle size distribution of the reduced molybdenum powder, the mean particle size of molybdenum powder will be finer when the wider size distribution of MoO3 powder is used. During the first reduction, with the thickness of feed layer of MoO3 powder increasing, the molybdenum powder particle will be coarse, particle size distribution will be broadened and the value of D（0.5） decreases slightly, but the value of D（0.5） increases with hydrogen dew point increasing. The mean particle size of molybdenum powder will be finer with the temperature of the second reduction decreasing. However, the mean particle size of molybdenum powder will be coarse, and the curve of particle size distribution will move to the right with the thickness of feed layer of molybdenum increasing and hydrogen flow decreasing.