高硅高铁粉煤灰制备SiO_2的工艺研究  

Process of Preparing SiO_2 by High Iron and Silicon Fly Ash

作　　者：缪应菊[1] 沈秋玉 周钰[1] 连明磊[1] 

机构地区：[1]六盘水师范学院化学与化学工程系,六盘水553004

出　　处：《硅酸盐通报》2016年第4期1260-1264,1269,共6页Bulletin of the Chinese Ceramic Society

基　　金：贵州省教育厅高等学校创新人才团队(黔教合人才团队字[2014]46);贵州省教育厅自然科学研究项目(黔教合KY字[2013]201);贵州省教育厅特色重点实验室资助项目(黔教高发:2011-278);贵州省科技厅资助项目(黔科合J字LKLS[2013]25)

摘　　要：以碳酸钠为活化剂活化粉煤灰,考察原料配方、焙烧条件(温度、时间)、酸浸条件(用量、浓度)、溶胶—凝胶条件(初始浓度、温度)对SiO_2产率的影响。结果表明:(1)当m粉煤灰:m碳酸钠≥1∶1.8或焙烧温度超过850℃时,样品发生烧结无法从坩埚中取出,而致酸浸分解率和SiO_2产率为零;(2)粉煤灰在没有助剂条件下进行高温活化,酸浸分解率为24.13%,无SiO_2产品;(3)盐酸浓度和溶胶-凝胶液的初始浓度对SiO_2的产率基本无影响;(4)温度是影响溶胶-凝胶的显著因素;(5)最佳工艺条件为:m粉煤灰∶m碳酸钠=1∶1.2、焙烧温度800℃、焙烧时间2 h;凝胶-凝胶水浴温度94℃,SiO_2的产率可达85.35%。Using sodium carbonate as activator,the mass ratio of sodium carbonate and fly ash,the roasting temperature and time,the dosage of hydrochloric acid,the concentration of hydrochloric acid,the Sol-gel initial concentration and water-bath temperature were investigated. The results showed that（ 1） when mfly ash∶ msodium carbonate≥1∶ 1. 8 or calcination temperature above 850 ℃,the sample cannot be removed from the crucible,and the decomposition rate of acid leaching and the yield of SiO_2 is zero.（ 2）The high temperature activation of fly ash in the absence of auxiliaries,acid leaching rate of 24. 13%,no SiO_2 products.（ 3） The initial concentration of the sol-gel solution and the concentration of hydrochloric acid had no effect on the yield of SiO_2.（ 4） Temperature is a significant factor affecting the sol-gel experiments;（ 5） The optimum technological conditions were： mfly ash∶ msodium carbonate= 1 ∶ 1. 2,calcination temperature 800 ℃,roasting time 2 h,the sol-gel water-bath temperature 94 ℃,the yield of SiO_2 can be up to 85. 35%.

关 键 词：粉煤灰 SIO2 工艺 影响因素 

分 类 号：TQ175[化学工程—硅酸盐工业]