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›› 2008, Vol. 8 ›› Issue (2): 253-257.

• 反应与分离 • 上一篇    下一篇

中高浓度铝酸钠溶液硫酸钙深度脱硅

李玉国 王雅静 翟玉春   

  1. 沈阳化工学院应化学院 沈阳化工学院物化教研室 东北大学 材料与冶金学院
  • 收稿日期:2007-08-03 修回日期:2007-10-17 出版日期:2008-04-20 发布日期:2008-04-20
  • 通讯作者: 王雅静

Deep Desiliconization of Mid-high Aluminate Concentration Solution with Calcium Sulfate

LI Yu-guo WANG Ya-jing ZHAI Yu-chun   

  1. Shenyang Institute of Chemical Technology Shenyang Institute of Chemical Technology College of Material and Metallurgy, Northeastern University
  • Received:2007-08-03 Revised:2007-10-17 Online:2008-04-20 Published:2008-04-20
  • Contact: WANG Ya-jing

摘要: 以二水硫酸钙为脱硅剂对中高浓度的铝酸钠溶液脱硅进行了研究,分别考察了温度、时间、二水硫酸钙用量、搅拌速度及铝酸钠溶液苛性比ak对浓度为200, 180, 150 g/L的铝酸钠溶液脱硅效果的影响. 在95℃及ak=1.5、二水硫酸钙用量30 g/L、搅拌速度为867 r/min条件下脱硅2 h后,200 g/L铝酸钠溶液中硅量指数达到3815,180 g/L铝酸钠溶液中硅量指数达到4082,150 g/L铝酸钠溶液中硅量指数可以达到4260. 通过XRD对脱硅后的渣相进行了分析,并探讨了二水硫酸钙的脱硅机理.

关键词: 二水硫酸钙, 铝酸钠溶液, 深度脱硅, 机理

Abstract: The deep desilication of mid-high aluminate concentration solution was investigated with the addition of calcium sulfate dihydrate. The desiliconization efficiency of the Al2O3 concentration (200, 180, and 150 g/L) was affected by the temperature, time, CaSO4×2H2O concentration, molar ratio of alumina to silicon (ak), and stirring speed. Under the conditions of 95℃, ak=1.5, stirring speed of 867 r/min and CCaSO4×2H2O=30 g/L, after 2 h, to the Al2O3 concentration of 200 g/L, the silica module was above 3815, to the Al2O3 concentration of 180 g/L, the silica module was above 4082, and to the Al2O3 concentration of 150 g/L, the silica module was above 4260. The residue was analyzed by XRD technique. The desiliconization mechanism with calcium sulfate dehydrate was also discussed in the text.

Key words: calcium sulfate dehydrate, sodium aluminate solution, deep disiliconization, mechanism

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