液相法制备碳酸钴及其结构表征

以工业生产氯化钴溶液为钴源,碳酸氢铵为沉淀剂,采用液相法制备碳酸钴。系统研究了沉淀过程碳酸氢铵用量、碳酸氢铵浓度、保温时间、陈化时间和反应温度对母液钴浓度和钴沉淀率的影响,得到优化沉淀工艺条件:碳酸氢铵单耗3.173g/g、碳酸氢铵浓度250g/L、保温时间10min、陈化时间30min、反应温度33℃,在优化条件下,母液钴浓度为0.045g/L,钴沉淀率达99.92%。碳酸钴粒度分布均匀且范围窄,D50=1.428-1.488μm,形貌为小颗粒球形团聚体,物相纯度高。

Preparation and Structural Characterizations of Cobalt Carbonate by Liquid Phase Synthesis Method

Cobalt carbonate precursor was prepared by liquid phase synthesis method with cobalt chloride as cobalt source and NH4HCO3 as precipitator.Effects of dosage and concentration of ammonium bicarbonate,holding time,aging time,and reaction temptation on Co2+concentration in mother liquor and Co precipitation rate were discussed.The results show that Co2+concentration in mother liquor is 0.045g/L and Co precipitation rate is 99.92%under the optimum conditions including dosage of ammonium bicarbonate of 3.173g/g,concentration of ammonium bicarbonate of 250g/L,holding time of 10min,aging time of 30min,and reaction temperature of 33℃.Cobalt carbonate precursor has uniform particle size distribution with D50=1.428-1.488μm,agglomerate with spherical particle as well as pure phase.