CaSO4-Ca（OH）2-H2O体系相平衡（英文）

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Published in中国有色金属学报：英文版 Vol. 22; no. 6; pp. 1478 - 1485
Main Author 王云燕 彭小玉 柴立元 舒余德
Format Journal Article
LanguageEnglish
Published 2012
Subjects
CaSO4-Ca（OH）2-H2O体系
废水
相图
相平衡
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ISSN1003-6326

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Bibliography:In order to provide the theoretical guidance for applying the neutralization method to treatment of heavy metals wastewater with high concentration of sulfate, and to better understand the mechanism of calcium sulfate scale formation, the equilibrium solubility data of CaSOa-Ca（OH）2-H2O system at 298.15 K were theoretically calculated via the Pitzer semi-empirical ion-interaction theory, and determined experimentally by the optical method combining with X-ray diffractometry, and the calculated and determined phase diagrams of CaSOa-Ca（OH）2-H2O system were plotted and compared. Physical definition of each area was studied, and the physical law of characteristic point and line was explained in detail. Adjusting the pH value of neutralization-hydrolysis solution depended on the SO4z- concentration in the system. And interaction characteristics between the solubilities of CaSO4（s）and Ca（OH）2（s）were found out.
43-1239/TG
CaSO4-Ca（OH）2-H2O system; phase equilibrium; phase diagram; wastewater
WANG Yun-yan, PENG Xiao-yu1＇2, CHAI Li-yuan1, SHU Yu-de 1. School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China; 2. Environmental Monitoring Central Station of Hunan Province, Changsha 410014, China
ISSN:1003-6326