| Synthesis and reaction behavior of calcium silicate hydrate in basic system |
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| 作者姓名： | 刘桂华 贺强 李小斌 彭志宏 周秋生 |
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| 作者单位： | School of Metallurgical Science and Engineering，Central South University，Changsha 410083，China，School of Metallurgical Science and Engineering，Central South University，Changsha 410083，China，School of Metallurgical Science and Engineering，Central South University，Changsha 410083，China，School of Metallurgical Science and Engineering，Central South University，Changsha 410083，China，School of Metallurgical Science and Engineering，Central South University，Changsha 410083，China |
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| 基金项目： | 国家自然科学基金，国家重点基础研究发展计划(973计划) |
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| 摘 要： | 1 INTRODUCTIONIt skeytoseparatealuminafromsilicainaluminaproductionbyBayerorsinteringprocess .Whethersilicachangestosodiumaluminosilicatehydrateorhydro garnet(bothtitleddesilicationproduct,DSP) ,bothcontainso daoralumina .IfDSPisdischargedoutdirectly ,alargeamountofsodaandaluminawillbewasted ,meanwhiledischargedDSPwillresultinheavyenvironmentalpollu tion .InpresentitcostsalottorecoveraluminaandsodafromDSPbysinteringprocess1] .Soitisurgenttodevel opnewhydro processtechnologytorecove…
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| 关 键 词： | 氢氧化物 反应性质 钙 硅 烧碱溶液 铝分离 |
Synthesis and reaction behavior of calcium silicate hydrate in basic system |
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| LIU Gui-hua,HE Qiang,LI Xiao-bin,PENG Zhi-hong,ZHOU Qiu-sheng.Synthesis and reaction behavior of calcium silicate hydrate in basic system[J].Transactions of Nonferrous Metals Society of China,2004,14(6):1204-1209. |
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| Authors: | LIU Gui-hua HE Qiang LI Xiao-bin PENG Zhi-hong ZHOU Qiu-sheng |
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| Abstract: | At the molar ratio of CaO to SiO2 of 1, with calcium hydroxide and sodium silicate, calcium silicate hydrate was synthesized at 50, 100, 170 ℃, respectively. The results show that temperature favors the formation of calcium silicate hydrate with perfect structure. When calcium silicate hydrate reacts with caustic solution, the decomposition rate of calcium silicate hydrate increases with the increasing caustic concentration and decreases with the raising synthesis temperature and the prolongation of reaction time. The decomposition rate is all less than 1.2 % in caustic solution, and XRD pattern of the residue after reaction with caustic solution is found as the same as that of original calcium silicate hydrate, which indicates the stable existence of calcium silicate hydrate in caustic solution.When reacted with soda solution, the decomposition rate increases with the increasing soda concentration and reaction time, while decreases with the synthesis temperature. The decomposition rate is more than 2% because CaO · SiO2 · H2O(CSH( Ⅰ )), except Ca5 (OH)2Si6O16 · 4H2O and Ca6Si6O17 (OH)2, is decomposed. So the synthesis temperature and soda concentration should be controlled in the process of transformation of sodium aluminosilicate hydrate into calcium silicate hydrate. |
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| Keywords: | calcium silicate hydrate reaction behavior soda solution |
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