中南大学学报（自然科学版）2011，Vol.42Issue(3)：595-599,5.
六水铝酸三钙(C3AH6)与CO2反应的研究
Reaction of tricalcium aluminate hexahydrate(C3AH6)with carbon dioxide
摘要
Abstract
In order to elucidate the reaction mechanism of tricalcium aluminate hexahydrate (C3AH6) with CO2, the influencing factors such as reaction medium and the concentration of CO2 in the mixture of CO2 and air, reaction process and the products were studied by XRD and pH acidity analyses. The reaction mechanism of C3AH6 and CO2 was proposed. The results show that the reaction rate of C3AH6 with CO2 is extremely slow both in the air and in the ethanol medium. However, in the medium of water, the reaction occurs quickly with the products of aluminum trihydroxide,calcium carbonate and water. And the reaction rate increases with the increase of the reaction temperature, CO2 concentration and reaction time. Under the optimized conditions of 75 ℃, pure CO2 and reaction time of 80 min, the reaction rate can reach 97.76％. The reaction mechanism is that the reaction rate is determined mainly by the solvation of C3AH6 in the initial stage of the reaction and subsequently by the ionization of carbonic acid in the late reaction stage. It is feasible to recover the alumina from C3AH6 by using CO2 as the reagent in water medium.关键词
六水铝酸三钙(C3AH6)/二氧化碳/氧化铝/反应机理分类
矿业与冶金引用本文复制引用
刘伟,张海宝,周秋生,彭志宏,齐天贵,李小斌,刘桂华..六水铝酸三钙(C3AH6)与CO2反应的研究[J].中南大学学报（自然科学版）,2011,42(3):595-599,5.基金项目
国家重点基础研究发展计划("973"计划)项(2005CB6237-02) （"973"计划）
湖南省科技重大专项项目(2009FJ1009) （2009FJ1009）
