Influence of silicate anions structure on desilication in silicate-bearing sodium aluminate solution  

作　　者：刘桂华 张闻 齐天贵 彭志宏 周秋生 李小斌 

机构地区：[1]School of Metallurgy and Environment, Central South University

出　　处：《Journal of Central South University》2016年第7期1569-1575,共7页中南大学学报（英文版）

基　　金：Project(51274242)supported by the National Natural Science Foundation of China;Project(2015CX001)supported by the Innovation-driven Plan in Central South University,China

摘　　要：The structural changes of silicate anions in the desilication process with the addition of calcium hydrate alumino-carbonate were studied by measuring Raman spectra, infrared spectra and corresponding second derivative spectra. The results show that the desilication ratio in the solution prepared by the addition of sodium silicate(solution-SS) is much greater than that in the solution by the addition of green liquor(solution-GL), and low alumina concentration in the sodium aluminate solutions facilitates the desilication process. It is also shown that alumino-silicate anions in the solution-GL, and Q^3 polymeric silicate anions in solution-SS are predominant, respectively. In addition, increasing the concentration of silica favors respectively the formation of the alumino-silicate or the Q^3 silicate anions in the solution-GL or the solution-SS. Therefore, it can be inferred that the low desilication ratio in the silicate-bearing aluminate solution is mainly attributed to the existence of alumino-silicate anions.The structural changes of silicate anions in the desilication process with the addition of calcium hydrate alumino-carbonate were studied by measuring Raman spectra, infrared spectra and corresponding second derivative spectra. The results show that the desilication ratio in the solution prepared by the addition of sodium silicate（solution-SS） is much greater than that in the solution by the addition of green liquor（solution-GL）, and low alumina concentration in the sodium aluminate solutions facilitates the desilication process. It is also shown that alumino-silicate anions in the solution-GL, and Q3 polymeric silicate anions in solution-SS are predominant, respectively. In addition, increasing the concentration of silica favors respectively the formation of the alumino-silicate or the Q^3 silicate anions in the solution-GL or the solution-SS. Therefore, it can be inferred that the low desilication ratio in the silicate-bearing aluminate solution is mainly attributed to the existence of alumino-silicate anions.

关 键 词：DESILICATION silicate anion STRUCTURE sodium aluminate solution second derivative spectrum oflR 

分 类 号：TQ170.1[化学工程—硅酸盐工业]