MoO_2氢还原机理探索  

EXPLORATION OF HYDROGEN REDUCTION OF MoO_2

作　　者：武洲[1] 冯鹏发[1] 李晶[1] 厉学武[1] 卜春阳[1] 

机构地区：[1]金堆城钼业股份有限公司技术中心,陕西西安710077

出　　处：《中国钼业》2011年第5期42-45,共4页China Molybdenum Industry

摘　　要：在MoO2还原为钼粉的过程中,大颗粒钼粉(指筛上物)的杂质含量会远远高于小颗粒钼粉。本文采用"核收缩"的理论模型来解释了这一现象。在MoO2氢还原为Mo的过程中,产生一种比起钼的其他化合物挥发性更强的氧化钼的水合物MoO3.H2O或MoO2(OH)2,这种水合物结合从MoO2收缩核中扩散出来的杂质,挥发沉积到长大的Mo颗粒的表面。大颗粒Mo粉的表面积大、表面能低,挥发性水合物更容易沉积在由众多细小颗粒团聚而成的大颗粒表面,从而造成大颗粒钼粉的杂质含量较高。There is a commonly confused phenomenon in the producing of molybdenum powder for a long time.Generally,there are much more impurities in molybdenum powder with large particle size than those of the small particle.The phenomenon can be explained by the model of ＂Core Shrinking＂.During the processing of MoO2 reduced to Mo in the hydrogen,a kind of volatile hydrated molybdenum oxide MoO3·H2O or MoO2（OH）2 will be generated which is much liable to volatilize than the other volatile compounds of molybdenum.As a result,the MoO3·H2O or MoO2（OH）2 combines with the impurities which diffuse from internal shrinking MoO2 particles and deposit on the surfaces of the growing Mo particles.And because the surface energy of large Mo particles is much lower than that of small ones,the combinations of MoO3·H2O or MoO2（OH）2 and impurities prefers to aggregate on the surface of large particles.This is the potential reason of the previous phenomenon.

关 键 词：钼粉 二氧化钼 氢还原 团聚 化学气相迁移 

分 类 号：TF841.2[冶金工程—有色金属冶金]