【摘要】 首次实现了Co(OH)2浆料在碱性介质中的氢还原反应, 并由此制得了粒度小于0.1μm的超细金属钴粉. 还原终点的pH为8～12, 反应一般可在30～60 min内完成, Co的金属转化率接近100%. 考察了pH、温度、氢分压、催化剂等对还原速度的影响，并与Ni (OH)2碱性水浆的氢还原作了简单比较.更多还原

【Abstract】 Ultrafine Co powder with an average particle size below 0.1μm was prepared by hydrogen reduction from the basic Co(OH)2 slurry, which was obtained by mixing the solution of CoSO4 with NaOH. The pH of the slurry was controlled between 8 and 12. The filtration and washing of the slurry were not necessary before hydrogen reduction. The proposed reduction temperature was 170(200oC, concentration of catalyst PdCl2 2 mg/L, partial pressure of H2 was 2(3 MPa, and reduction time about 40 min. Temperature and concentration of PdCl2 showed obvious effects on the reaction, and pH of the end solution showed major effect on particle size of Co powder obtained.更多还原