Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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Transactions of Nonferrous Metals Society of China

Vol. 14    No. 6    December 2004

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Synthesis and reaction behavior of calcium silicate hydrate in basic system
LIU Gui-hua(刘桂华), HE Qiang(贺 强), LI Xiao-bin(李小斌),
PENG Zhi-hong(彭志宏),  ZHOU Qiu-sheng(周秋生)

School of Metallurgical Science and Engineering,  Central South University,
Changsha 410083,  China

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 pr, ocess of transformation of sodium aluminosilicate hydrate into calcium silicate hydrate.


Key words:  calcium silicate hydrate; reaction behavior; soda solution

ISSN 1004-0609
CN 43-1238/TG

ISSN 1003-6326
CN 43-1239/TG

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