碳酸盐湿式沉淀-煅烧分解法制备四氧化三钴及其表征

Preparation and characterization of Co3O4 by wet precipitation-thermal decomposition with carbonate

以氯化钴、碳酸氢铵为原料,吐温80（Tween-80）为表面活性剂,通过湿式沉淀法合成氧化钴的前驱体,再通过热分解制备四氧化三钴。采用扫描电镜、激光粒度仪、X射线衍射仪、热分析仪分析了碱式碳酸钴前驱体和钴氧化物的微观形貌、晶体结构和热分解等特征。结果表明：以碳酸盐为沉淀剂制得的钴氧化物前驱体为碱式碳酸钴,前驱体于600℃煅烧4 h后可得到粒径分布均匀、无团聚、平均粒径（D50）为4.48μm,钴质量分数为72.11%的球形立方四氧化三钴。

The cobalt oxide precursor was prepared by wet precipitation method with cobalt chloride and ammonium bicarbonate as raw materials and Tween-80 as surfactant. The Co3O4 powder was obtained by thermal decomposition method. The morphology,crystal structure and thermal decomposition of precursor particles and Co34 powder were characterized by scanning electron microscope,laser particle size analyzer,X-ray diffractometer and thermal analyzer. Results show that the precursor of cobalt oxide prepared with carbonate as precipitant is Co2（OH）2C3.The spherical cubic Co3O4 powder with uniform particle size distribution and without agglomeration is obtained when the precursor is calcined at 600 ℃ for 4 h. The average particle size of the Co3O4 powder is 4.48 μm and the mass percent of cobalt is 72.11%.