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›› 2008, Vol. 8 ›› Issue (5): 945-948.

• 过程与工艺 • 上一篇    下一篇

高浓度铝酸钠溶液碳酸化分解产品中Na2O含量的控制

李小斌 周小淞 周秋生 彭殿军 刘桂华 彭志宏   

  1. 湖南省中南大学冶金科学与工程学院 中南大学冶金科学与工程学院 中南大学冶金科学与工程学院 中南大学冶金科学与工程学院 中南大学冶金科学与工程学院 中南大学冶金科学与工程学院
  • 收稿日期:2008-04-22 修回日期:2008-07-08 出版日期:2008-10-20 发布日期:2008-10-20
  • 通讯作者: 周秋生

Control of Na2O Content in Aluminum Hydroxide from Carbonization of Sodium Aluminate Solution with High Alumina Concentration

LI Xiao-bin ZHOU Xiao-song ZHOU Qiu-sheng PENG Dian-jun LIU Gui-hua PENG Zhi-hong   

  1. School of Metallurgical Science and Engineering, Central South University School of Metallurgical Science and Engineering, Central South University School of Metallurgical Science and Engineering, School of Metallurgical Science and Engineering, Central South University School of Metallurgical Science and Engineering, Central South University School of Metallurgical Science and Engineering, School of Metallurgical Science and Engineering, Central South University School of Metallurgical Science and Engineering, Central South University School of Metallurgical Science and Engineering, School of Metallurgical Science and Engineering, Central South University School of Metallurgical Science and Engineering, Central South University School of Metallurgical Science and Engineering, School of Metallurgical Science and Engineering, Central South University School of Metallurgical Science and Engineering, Central South University School of Metallurgical Science and Engineering, School of Metallurgical Science and Engineering, Central South University School of Metallurgical Science and Engineering, Central South University School of Metallurgical Science and Engineering,
  • Received:2008-04-22 Revised:2008-07-08 Online:2008-10-20 Published:2008-10-20
  • Contact: ZHOU Qiu-sheng

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被引次数

21

摘要： 依据铝酸钠溶液碳酸化分解遵循晶种分解的机理，在自制碳分槽中采用间断碳分的方法，在不添加Al(OH)3晶种的条件下，研究了不同分解工艺条件[分解温度70~95℃，CO2气体浓度25%~60%(j)，CO2通气速度0.055~0.167 m3/(h×L)]对高浓度铝酸钠溶液碳酸化分解产品Al(OH)3中Na2O含量的影响规律. 结果表明，通过提高碳酸化分解温度、降低CO2通气量来调控铝酸钠溶液的过饱和度，控制碳酸化分解速率，能显著降低分解产品中Na2O的含量. 当碳酸化分解原液Al2O3浓度在170~180 g/L、溶液苛性分子比ak=1.40~1.50时，控制碳酸化分解温度为95℃左右，采用低浓度、慢速通气制度，分解6 h左右分解率达到90%~93%，所得碳酸化分解产品中Na2O含量可控制在0.25%(w)以下.

关键词: 高浓度, 铝酸钠溶液, 碳酸化分解, Na2O

Abstract: According to the mechanism of carbonization of sodium aluminate solution following the mechanism of seeded precipitation, the influences of different conditions, temperature 70~95℃, CO2 concentration 25%~60%(j), and CO2 ventilation rate 0.055~0.167 m3/(h·L), for batch carbonization of sodium aluminate solution with high alumina concentration on Na2O content in carbonization product were investigated in the self-designed carbonization tank without addition of aluminum hydroxide seed. The results show that Na2O content in carbonization product can be significantly reduced by increasing carbonization temperature and decreasing the amount of ventilated CO2 to adjust the super-saturation of liquor and control the carbonization rate of sodium aluminate solution. Na2O content in carbonization product could reach less than 0.25%(w) with low CO2 concentration and ventilation rate under the following carbonization conditions: carbonization temperature is in the vicinity of 95℃, alumina concentration in the original purified aluminate solution for carbonization varies from 170 to 180 g/L with molar ratio of Na2O to alumina 1.40~1.50, and carbonization time is about 6 h with carbonization rate 90%~93%.

Key words: high concentration, sodium aluminate solutio, carbonization precipitation, Na2O

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