CaO-MgO-SiO_2-H_2O体系的热力学基础研究  

Thermodynamic Study on CaO-MgO-SiO_2-H_2O System

作　　者：范付忠[1] 钱光人[1] 赖振宇[1] 徐光亮[1] 

机构地区：[1]西南工学院材料系,绵阳621001

出　　处：《硅酸盐通报》2001年第1期18-23,17,共7页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金 !(No .5 69740 3 4 );国家建材局行业基金! (No .J 96 2 0 )资助项目

摘　　要：本文从热力学角度系统研究了CaO MgO SiO2 H2 O体系及钢渣中钙镁硅矿物在水热条件下的反应特性。结果表明 :在CaO MgO SiO2 H2 O系统中 ,CaO优先与SiO2 反应生成水化硅酸钙 ,MgO只能与剩余的SiO2 反应生成水化硅酸镁 ;MgO固溶时 ,可促进托勃莫来石向硬硅钙石转化 ,而对白钙沸石向白钙镁沸石的转化影响不大 ,不固溶MgO时 ,低温型水化硅酸钙向高温型转化温度提高。钢渣钙镁硅矿物中 ,镁蔷薇辉石活性最大 ,透辉石活性最差 。The reaction characteristic of CaO MgO SiO 2 H 2O system under hydrothermal condition was investigated by thermodynamic analysis.It shows that in the CaO MgO SiO 2 H 2O system,CaO firstly reacts with SiO 2,and the hydrated calcium silicate is the final product.MgO only reacts with surplus SiO 2 to form hydrated magnesium silicate.When MgO is in the form of solid solution in the hydrated calcium silicate,it can promote the transformation of tobermorite to xonotlite,but has little influence on that of gyrolite to truscottite,otherwise the temperature of the change increases from low temperature hydrated calcium silicate to high temperature hydrated calcium silicate.The results indicate that merwinite is superior to diopside in the reaction activity in Ca Mg Si minerals in the steel slag,and the reaction activity of monticellite and akermanite is between them.

关 键 词：CaO-MgO-SiO2-H2O体系 水热反应 热力学 转化机制 富镁低碱度钢渣 

分 类 号：TQ170.14[化学工程—硅酸盐工业] TQ172.7