铝酸钠溶液碳分—超声酸洗制备高纯Al_2O_3  

Preparation of High Purity Al_2O_3 from Sodium Aluminate Solution by Carbon Decomposition and Pickling Assisted with Ultrasonic

作　　者：李涛 金会心[1,2] 刘虹伶 LI Tao;JIN Hui-xin;LIU Hong-ling(l.College of Materials and Metallurgy,Guizhou University,Guiyang 550025,Chin;Guizhou Province Key Laboratory of Metallurgical Engineering and Energy Saving,Guiyang 550025,China)

机构地区：[1]贵州大学材料与冶金学院,贵阳550025 [2]贵州省冶金工程与过程节能重点实验室,贵阳550025

出　　处：《有色金属（冶炼部分）》2018年第9期35-39,共5页Nonferrous Metals（Extractive Metallurgy)

基　　金：国家自然科学基金资助项目(51474079;51564003)

摘　　要：研究了分解温度、CO_2气体浓度、Al_2O_3浓度和分解时间对铝酸钠溶液碳分Al_2O_3分解率的影响,以及碳分后得到的氢氧化铝粉体在酸洗过程中超声波酸洗对产品氧化铝纯度的影响。结果表明,在溶液浓度105g/L、溶液苛性分子比αk=1.50时,控制碳酸化分解温度60℃左右,CO_2浓度30.0%,分解时间4h,分解率达到93%,碳分后得到的氢氧化铝粉体在普通酸洗条件下得到的Al_2O_3含量为99.87%,超声波酸洗后得到的Al_2O_3含量可以达到99.99%。Effects of decomposition temperature,CO2 concentration,Al2O3 concentration,and decomposition time on decomposition rate of Al2O3 were investigated.Acid pickling assisted with ultrasonic of aluminum hydroxide powder obtained from carbon decomposition on purity of alumina product was investigated.The results show that decomposition rate is 93% under the conditions including solution concentration of 105 g/L,αkof 1.50,carbonation decomposition temperature of about 60 ℃,CO2 concentration of 30.0%,and decomposition time of 4 h.Purity of Al2O3 is 99.87% produced from aluminum hydroxide powder by ordinary acid pickling.Purity of Al2O3 is 99.99% produced from aluminum hydroxide powder by acid pickling assisted with ultrasonic.

关 键 词：铝酸钠溶液 碳酸化分解 氧化铝 

分 类 号：TF821[冶金工程—有色金属冶金]