中高浓度铝酸钠溶液一段脱硅工艺研究  

Research on the One-stage Desilication Process for the Mid-high Concentration of Sodium Aluminate Solution

作　　者：王雅静[1] 王立思[1] 庞常健[1] 翟玉春[2] 

机构地区：[1]沈阳化工大学,应用化学学院,辽宁沈阳110142 [2]东北大学,材料与冶金学院,辽宁沈阳110004

出　　处：《矿产综合利用》2013年第3期36-38,48,共4页Multipurpose Utilization of Mineral Resources

基　　金：国家科技部973项目(G199904690-4);辽宁省教育厅项目(05L339)

摘　　要：硅是铝酸钠溶液中最难除去的杂质,若硅含量过高会造成氧化铝产品的损失。通过改变脱硅温度、脱硅时间、铝酸钠溶液浓度及脱硅剂用量来确定铝酸钠溶液一段脱硅的较优条件。试验表明最优条件是脱硅温度为100℃,时间为100 min,脱硅剂用量为27g/L,搅拌速度为300r/min,铝酸钠溶液浓度从140～200g/L,脱硅指数可达1000以上。并通过测定表面张力随脱硅时间、脱硅温度变化,及通过钙硅渣XRD衍射试验,分析了铝酸钠溶液一段脱硅机理。铝酸钠溶液一段脱硅后能够基本达到铝酸钠溶液二段脱硅的工艺要求。The removal of silicon in the sodium aluminate solution is the most difficult among all the impurities. Alu- mina products will be lost if the content of silicon is too high. In this paper,the one-stage desilication optimal condi- tion was obtained by changing the desi｜ieation temperature, desilication time, sodium aluminate solution concentra- tion and calcium silicon slag content. The results showed when the desilication temperature is 100℃, the time is 100min,the dosage of the agent is 27g/L, the stirring speed is 300r/min and the concentration of the sodium alumi- nate solution is from 140g/L to 200 g/L, the desilication index is more than 1000. The first-stage desilication mech- anism of sodium aluminate solution was obtained by measuring surface tension with desilication time,temperature; and by analyzing the XRD of calcium silicon slag. The sodium aluminate solution after the first-stage desilication can almost meet the requirement of the deep desilication process.

关 键 词：铝酸钠溶液 脱硅 硅量指数 XRD衍射 

分 类 号：TD989[矿业工程—选矿] TF03[冶金工程—冶金物理化学]