摘要
草酸钴是制备钴粉的重要前驱体,其常见的沉淀产物呈长条棒状,而工业上急需球状或类球状的颗粒。本研究提出了一种新颖的方法,控制钴离子/草酸根的化学计量比远离1.0和温度在80℃以上时,能成功地将草酸钴沉淀形貌从晶须状改变成类球形。研究认为,在钴离子过量或草酸根离子过量的情况,会影响草酸钴成核基团及晶核表面的荷电状态,而80℃以上高温作用可能显著改变晶核表面液膜层内出现紊流传质现象,使得晶核各个晶面上生长速度差异变小,最终形成类球形颗粒草酸钴。本研究结果,将为草酸钴沉淀形貌调控及类球形草酸钴的生产提供重要指导。
Cobalt oxalate is an important raw material for preparing cobalt powder. Its conventional precipitates are mainly whiskers, while spherical or quasi-spherical particles are urgently needed in the industry. In this study, a novel method was proposed, which could change the morphology of cobalt oxalate precipitates from whiskers to quasi-spherical by making the stoichiometric ratio of cobalt ions/oxalate away from 1.0 and the temperature above 80 ℃. The research shows that excessive cobalt ions or oxalate ions affect the state of charge of the cobalt-oxalate nucleating group and the surface of the crystal nucleus. A temperature of over 80 ℃ may significantly alter turbulent mass transfer within the liquid film on the nucleus surface, which can reduce the difference in the growth rate on each surface of the crystal nucleus to form quasispherical particles of cobalt oxalate. The results of this study can provide important guidance for the precipitation morphology control of cobalt oxalate and the production and preparation of quasi-spherical cobalt oxalate particles.
作者
宋晨杰
黄凯
Song Chenjie;Huang Kai(School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China;Beijing Key Laboratory of Green Recycling and Extraction of Metals,University of Science and Technology Beijing,Beijing 100083,China)
出处
《硬质合金》
CAS
2023年第1期31-41,共11页
Cemented Carbides
关键词
类球形草酸钴
等轴晶
沉淀
温度
各向同性生长
quasi-spherical cobalt oxalate
equiaxed crystal
precipitation
temperature
isotropic growth
