碳酸盐在铝土矿溶出过程中的脱除行为  

Removal Behavior of Carbonate in Bauxite Digestion Process

作　　者：武世鹏 潘晓林[1,2] 吴鸿飞 于海燕 WU Shi-peng;PAN Xiao-lin;WU Hong-fei;YU Hai-yan(Key Laboratory for Ecological Metallurgy of Multimetallic Minerals(Ministry of Education),Northeastern University,Shenyang 110819,China;School of Metallurgy,Northeastern University,Shenyang 110819,China)

机构地区：[1]东北大学多金属共生矿生态化冶金教育部重点实验室,辽宁沈阳110819 [2]东北大学冶金学院,辽宁沈阳110819

出　　处：《东北大学学报（自然科学版）》2022年第1期33-39,共7页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金资助项目(51774079);中央高校基本科研业务费专项资金资助项目(N182508026)。

摘　　要：采用XRD,XRF,SEM-EDS和PSD等检测手段,系统研究了不同石灰添加量、溶出温度、晶种添加量和碳酸盐质量浓度下一水硬铝石型铝土矿高压溶出过程中铝酸钠溶液中碳酸盐含量的变化规律及其脱除机理.结果表明:铝酸钠溶液中碳酸盐质量浓度为25 g·L^(-1)时,氧化铝溶出和碳酸盐脱除的最佳条件为:石灰添加量为11%,溶出温度为270℃,此时氧化铝的溶出率和碳酸盐的脱除率分别为72.47%和68.95%.具有板条状结构的霞石(Na_(6)(Al_(6)Si_(6)O_(24))·Na_(2)CO_(3)·2H_(2)O)为脱除碳酸盐时的主要产物.铝酸钠溶液中碳酸盐质量浓度在25 g·L^(-1)以下时碳酸盐更易脱除.The changing rule and removal mechanism of carbonate from sodium aluminate solution with lime addition,digestion temperature,seed addition and carbonate concentration were systematically investigated by XRD,XRF,SEM-EDS and PSD methods.The results show that when the mass concentration of carbonate in sodium aluminate solution is 25 g·L^(-1),the optimum digestion conditions of alumina and removal conditions of carbonate were lime addition of 11%and reaction temperature of 270℃,and the corresponding digestion rate of alumina and removal rate of carbonate were 72.47%and 68.95%respectively.Cancrinite(Na_(6)(Al_(6)Si_(6)O_(24))·Na_(2)CO_(3)·2H_(2)O)with panel structure is the main product in the carbonate removing process.Carbonate is easier to be removed from sodium aluminate solution when its concentration is lower than 25 g·L^(-1).

关 键 词：铝土矿 溶出 铝酸钠溶液 碳酸盐 霞石 

分 类 号：TP20[自动化与计算机技术—检测技术与自动化装置]