多元醇还原制备球形超细钴粉

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)₂ 150 g/L、NaOH用量40 g/L及表面活性剂30 g/L乙二醇的条件下，制得的钴粉粒度分布较窄，平均粒径为0.88 μm，比表面积为2.705 m2/g，钴含量大于99.5%.

Preparation of Ultrafine Spheric Co Powder by Polyot Reduction

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 m2/g,and the Co content was over 99.5%.