溶液雾化氧化法制备四氧化三钴粉末

针对溶液雾化氧化法制备四氧化三钴粉末过程,研究了工程实验条件下反应温度、雾化压力和氯化钴溶液流量等参数对钴氧化率、粉末粒度和粉末松装密度的影响.在反应温度750℃、氯化钴溶液质量浓度120 g.L-1、压缩空气压力0.23 MPa、氯化钴溶液压力0.15 MPa以及氯化钴溶液流量40 L.h-1条件下,制备的氧化钴再经750℃热处理2 h后,钴氧化率达到100%,钴质量分数为73.04%,松装密度为0.48 g.cm-3,平均粒径为7.61μm.工程实验研究结果表明溶液雾化氧化法可以高效快速制备高品质四氧化三钴粉末,过程简单、清洁,具有产业化应用前景.

Preparation of Co3O4 particles by solution spray-oxidation

Solution spray-oxidation as a novel method was developed to prepare cobalt oxide powders.Engineering tests were conducted to investigate the effects of some main factors such as temperature,atomization pressure and CoCl₂ solution flow rate on the conversion efficiency of cobalt oxide,the particle size and the apparent density of the powders.The optimum conditions to obtain cobalt oxide were determined as follows: temperature 750 ℃,solution concentration 120 g·L-1,air pressure 0.23 MPa,solution pressure 0.15 MPa,solution flow rate 40 L·h-1,heat treatment temperature 750 ℃,and heat treatment time 2 h.Under these conditions,the conversion efficiency of cobalt oxide is 100%,the content of cobalt in the product is 73.04%,the apparent density of the powder is 0.48 g·cm-3,and the average particle size of the powder is 7.61 μm.It is shown by the engineering test results that the solution spray-oxidation method is available for Co₃O₄ preparation and the process is simple,fast and environmental friendly.