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热历史对铝酸钠溶液中含铝离子之间转化的影响
引用本文:李小斌,赵东峰,杨帅帅,王丹琴,周秋生,刘桂华. 热历史对铝酸钠溶液中含铝离子之间转化的影响[J]. 中国有色金属学会会刊, 2014, 24(10): 3348-3355. DOI: 10.1016/S1003-6326(14)63476-2
作者姓名:李小斌  赵东峰  杨帅帅  王丹琴  周秋生  刘桂华
作者单位:中南大学
基金项目:Project(51274243)supported by the National Natural Science Foundation of China
摘    要:为了优化拜耳法生产氧化铝的过程,有必要明晰热历史对铝酸钠溶液中含铝离子间转化的影响。通过对不同组成铝酸钠溶液经过热处理、稀释和浓缩后其红外谱图的测定,研究溶液中含铝离子间的转化规律。结果表明:升高温度和延长保温时间有助于Al2-2O(OH)6离子向880 cm-1波数处Al—OH结构四面体聚合物和Al(OH)-4转化;稀释过程中快速发生A12O(OH)2-6和Al—OH结构四面体聚合物向Al(OH)-4的转化,但稀释后溶液可发生Al(OH)-4向Al—OH结构四面体聚合物的恢复性转化;浓缩过程则发生Al(OH)-4向Al—OH结构四面体聚合物和A122O(OH)2-6的转化,且向A12O(OH)-6的转化较困难。

关 键 词:铝酸根离子  结构变化  红外光谱  热历史
收稿时间:2013-10-28

Influence of thermal history on conversion of aluminate species in sodium aluminate solution
Xiao-bin LI,Dong-feng ZHAO,Shuai-shuai YAN,Dan-qin WANG,Qiu-sheng ZHOU,Gui-hua LIU. Influence of thermal history on conversion of aluminate species in sodium aluminate solution[J]. Transactions of Nonferrous Metals Society of China, 2014, 24(10): 3348-3355. DOI: 10.1016/S1003-6326(14)63476-2
Authors:Xiao-bin LI  Dong-feng ZHAO  Shuai-shuai YAN  Dan-qin WANG  Qiu-sheng ZHOU  Gui-hua LIU
Affiliation:(School of Metallurgy and Environment, Central South University, Changsha 410083, China)
Abstract:It is necessary to clarify the influence of thermal history on the conversion of aluminate species in sodium aluminate solution in order to optimize Bayer alumina production. The interconversion of various solution species in the systems was investigated by measuring the infrared spectra of sodium aluminate solution with different compositions after separate heat treatment, dilution and concentration. The results show that increasing temperature or prolonging holding time favors the transformation of Al2O(OH)2- to Al—OH vibration(condensed Al O4 tetrahedral aluminate ion) at about 880 cm-1 and Al(OH)-4. A12O(OH)2-66 and Al—OH tetrahedral dimer ions convert rapidly to Al(OH)-4 during the dilution process; however, the back transformation of Al(OH)-4 to the Al—OH tetrahedral dimer ions can occur in diluted sodium aluminate solution. As for the concentration process, the transformation of Al(OH)-4 to A12O(OH)2-6 and Al—OH tetrahedral dimer ions can take place, while it is relatively difficult to transform to A12O(OH)2-6.
Keywords:aluminate ions  structural changes  infrared spectrum  thermal history
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