多元醇还原制备球形超细钴粉

Preparation of Ultrafine Spheric Co Powder by Polyot Reduction

以自制Co(OH)2为原料,乙二醇为溶剂和还原剂,制得了分散性好的球形超细钴粉.考察了NaOH加入量对反应速度的影响,单位体积乙二醇的Co(OH)2加入量和添加剂的用量对钴粉粒径和形貌的影响.用SEM,XRD,BET和激光粒度分析仪测试粉体的粒子形貌、晶体结构、比表面积和粒度分布.测试结果表明:多元醇还原的钴粉为球形,以面心立方晶体为主,还有微量的简单六方晶体;在Co(OH)2150g/L、NaOH用量40g/L及表面活性剂30g/L乙二醇的条件下,制得的钴粉粒度分布较窄,平均粒径为0.88μm,比表面积为2.705m2/g,钴含量大于99.5%.

The ultrafine spheric Co powder with good dispersity was prepared with Co(OH)_2 being the raw material and glycol being the solvent and reductant.The effect of the quantity of NaOH on the reaction speed,the effect of the quantity of Co(OH)_2 per unit volume of glycol and the quantity of additive on the particle-size and particle-appearance of the Co powder were examined.SEM,XRD,BET and the laser particle-size analyzer were used to examine the particle appearance,the crystal structure,the surface area and the particle-size distribution.The results showed that the Co powders reduced by polyol were spheric,most being cubic closest packing,few being hexagonal closert packing;when the conditions were Co(OH)_2 150 g/L,NaOH 40 g/L and surface active agent glycot 30 g/L,the particle-size distribution of Co powder was narrow with an average dimeter of 0.88 μm,the surface area was 2.705 m^2/g,and the Co content was over 99.5%.