碱溶碳分法氧化铝生产工艺中碳分母液的深度除铝方法  

Alkali dissolution-carbonation precipitation process for producing alumina:Removal of aluminum from the carbonization liquor

作　　者：仇倩[1] 张彦玲[1] 唐阳[1] 陈咏梅[1] 万平玉[1] 钮因健[2] 

机构地区：[1]北京化工大学理学院,北京100029 [2]中国有色金属工业协会,北京100841

出　　处：《轻金属》2013年第9期8-11,41,共5页Light Metals

摘　　要：离子膜电解碳分母液是碱溶碳分法氧化铝生产工艺中的关键技术,其中碳分母液中未分解的偏铝酸根离子对膜电解生产条件及离子膜的使用寿命有重要影响。碳分母液的深度除铝方案是在其中加入碳酸氢钠溶液使偏铝酸根离子转化为溶解度更小的丝钠铝石。系统研究了碳酸氢钠溶液加入方式、滴加速度、反应温度和时间以及老化等操作条件对丝钠铝石粒径、形貌以及母液中铝含量的影响,在优化的工艺条件下,利用该方法可以使碳分母液中铝含量从300mg/L降低到0.41mg/L,符合离子膜电解工艺要求。The alkali dissolution -carbonization precipitation process is a novel alumina procedure, in which membrane -electrolysis of the carbonization liquor is the key technique. The impurities in the carbonization liquor, such as AIO2 - , would shorten the lifetime of ion - exchange - membrane dramatic- ally. NaHCO3 solution is added into the carbonization liquor, so that A102 - transforms to dawsonite precipitation to be filtered off. Effects of adding speed, temperature and aging time on the size and morphology of dawsonite particles and the removal of AI have been studied. In the optimized conditions, the concentration of AI in the carbonization liquor decrease from 300 mg/L to 0. 41mg/L.

关 键 词：碱溶碳分法氧化铝生产工艺 碳分母液 深度除铝 丝钠铝石 

分 类 号：TF821[冶金工程—有色金属冶金]