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

  • Materials, Metallurgy, Chemical and Environmental Engineering
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Abstract

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 Q3 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.

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Authors and Affiliations

  1. School of Metallurgy and Environment, Central South University, Changsha, 410083, China

    Gui-hua Liu  (刘桂华), Wen Zhang  (张闻), Tian-gui Qi  (齐天贵), Zhi-hong Peng  (彭志宏), Qiu-sheng Zhou  (周秋生) & Xiao-bin Li  (李小斌)

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  1. Gui-hua Liu  (刘桂华)
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  2. Wen Zhang  (张闻)
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  3. Tian-gui Qi  (齐天贵)
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  4. Zhi-hong Peng  (彭志宏)
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  5. Qiu-sheng Zhou  (周秋生)
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  6. Xiao-bin Li  (李小斌)
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Correspondence to Tian-gui Qi  (齐天贵).

Additional information

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

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Liu, Gh., Zhang, W., Qi, Tg. et al. Influence of silicate anions structure on desilication in silicate-bearing sodium aluminate solution. J. Cent. South Univ. 23, 1569–1575 (2016). https://doi.org/10.1007/s11771-016-3210-1

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  • DOI: https://doi.org/10.1007/s11771-016-3210-1

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