活化粉煤灰超细粉体的制备技术  

Preparation Technology of Ultrafine Powder of Active Fly-ash

作　　者：方荣利[1] 阳勇福[1] 

机构地区：[1]西南科技大学材料学院,四川绵阳621010

出　　处：《重庆大学学报（自然科学版）》2004年第2期128-131,共4页Journal of Chongqing University

基　　金：科技部中小企业技术创新基金项目(03C26215100240)

摘　　要：采用高温煅烧与控制C2S晶相转变来活化粉煤灰及制备粉煤灰超细粉体,用X射线衍射法对粉煤灰及活化粉煤灰的矿物组成进行了测定,结果显示:活化粉煤灰的主要矿物为硅酸二钙(C2S)和七铝十二钙(C12A7)。研究结果显示影响硅酸二钙晶相转变的主要因素有钙硅比、煅烧温度、煅烧时间、样品冷却方式等,并给出了有利于硅酸二钙晶相转变的最佳参数。通过有效消除阻止C2S晶相转变的干扰因素,粉煤灰高温烧结料自粉化率可达到100%,自粉化料平均粒径小于1.0μm。Calcining at high temperature and controlling the crystal change of C(2)S were adoped to activate flyash and to prepare ultrafine powders of flyash. Mineral compositions of flyash and activated flyash have been mensurated. The main compositions of flyash are mullite (3Al(2)O(3)·2SiO(2)) and quartz (SiO(2)),and the activated flyash's are di-calcium silicate(C(2)S) and C(12)A(7). The main factors such as the ratio of calcium and silicate, the calcination temperature, calcination time and the cooling mode of sample influencing the crystal change of C(2)S have been studied,and the best process parameters that propitious to the crystal change of C(2)S have been found out. Disturbing factors of crystal change of C(2)S are eliminated effectively and the complete self-pulverization of fly-ash sinter is realized, and the average diameter of powers is less than 1.0 μm.

关 键 词：粉煤灰 晶相转变 自粉化 

分 类 号：X705[环境科学与工程—环境工程]