铝酸钠溶液碳酸化分解制备氢氧化铝微粉

Aluminum hydroxide micro powder prepared by carbonation decomposition of sodium aluminate solution

应用氢氧化铝晶体的生长原理,采用碳酸化分解法制备氢氧化铝微粉,分别研究CO2气体的流量、铝酸钠溶液的浓度、分解温度、搅拌速率等因素对氢氧化铝中杂质含量的影响。得到的产品采用XRD和ICP进行表征。实验结果表明,当CO2流量为12.5L/h,铝酸钠溶液的浓度为58.07g/L,碳分温度为50℃,搅拌速率为200 r/min时可以得到纯度大于99.5%的氢氧化铝微粉,将得到的微粉进行高温煅烧后即可得到高纯氧化铝粉体。

By analyzing of growing principle of aluminum hydroxide crystals, aluminum hydroxide micro powder was prepared by carbonation decomposition. The influences of CO2 gas flow, the concentration of sodium aluminate solution, decomposition temperature, stirring rate and other factors on the im- purity content of aluminum hydroxide were respectively studied, and the products prepared were characterized by XRD and ICP. Experimental results showed that the aluminum hydroxide micro powder of more than 99.5% could be prepared under 58.07g/L of the concentration of sodium aluminate solu- tion, 12.5L/h of CO2 gas flow, 50℃ of carbonation temperature and 200r/min of stirring speed, and the high purity alumina powder would be gain after high temperature calcinations of the aluminum hydroxide.