A novel liquid precipitation route to synthesize high-quality cobalt carbonate with low chloride ions concentration

2019 5th International Conference on Energy Materials and Environment Engineering

能源学;生态环境科学

Guo, Miaomiao^1^2 ; Xi, Xiaoli^1 ; Li, Sen^2 ; Long, Xiaolin^2 ; Nie, Zuoren^1 ; Xu, Kaihua^2

National Engineering Laboratory for Industrial Big-data Application Technology, Beijing University of Technology, Beijing

100124, China^1

Chinese National WEEE Recycling Engineering Research Center, Jingmen GEM New Material Co. Ltd, Jingmen

448124, China^2

关键词: BET specific surface area;    Bicarbonate solution;    Influence of process parameters;    Liquid phase precipitation;    Nucleation and growth;    Physio-chemical properties;    Reaction temperature;    Secondary particles;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/295/3/032104/pdf
DOI  :  10.1088/1755-1315/295/3/032104

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Herein, high-quality cobalt carbonate is synthesized by employing a novel liquid phase precipitation route, where CoCl2 and ammonium bicarbonate solutions are used as the raw material and precipitator, respectively. The morphology of primary and secondary particles and agglomeration due to their nucleation and growth are influenced by the stirring speed, reaction temperature and pH value. Furthermore, the influence of process parameters on physiochemical properties has been systematically studied by measuring apparent density, FSSS particle size, specific surface area and chloride ions concentration. Under optimal processing conditions, i.e., stirring speed of 100 rpm, pH value of 7.0-7.1 and a reaction temperature of 55 °C, the as-synthesized cobalt carbonate rendered an apparent density of 0.74 g/cm3 and chloride ions concentration of 19 ppm. The results reveal that the washing efficiency of chloride ions is affected by the morphology of primary particles and stacking mode of the secondary particle in cobalt carbonate. In general, the higher BET specific surface area of cobalt carbonate results in lower chloride ions concentration.