碱熔融焙烧SiO_2和Zn_2SiO_4反应过程分析  

Reaction Process Analysis of SiO_2 and Zn_2SiO_4 Roasting with Molten NaOH

作　　者：申晓毅[1,2] 贾超航 李豪[1,2] 武康龙 

机构地区：[1]东北大学冶金学院,辽宁沈阳110819 [2]辽宁省冶金传感器及技术重点实验室,辽宁沈阳110819

出　　处：《东北大学学报（自然科学版）》2017年第1期51-56,共6页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金资助项目(51204054);中央高校基本科研业务费专项资金资助项目(N150204009);东北大学创新创业训练计划项目(151056)

摘　　要：以自制SiO_2和分析纯Zn_2SiO_4为研究对象,NaOH为反应介质,考察了反应温度、物料配比和反应时间对硅提取率的影响.碱熔融焙烧SiO_2的合适反应条件:反应温度450℃,NaOH与SiO_2物质的量比2.4∶1,反应时间60 min.二氧化硅与NaOH反应先生成Na_2SiO_3,随温度升高逐步转化为Na_4SiO_4.碱熔融焙烧Zn_2SiO_4的合适反应条件为反应温度500℃,NaOH与Zn_2SiO_4物质的量比20∶1,反应时间150 min.Zn_2SiO_4与NaOH反应生成Na_2ZnSiO_4和Na_2ZnO_2,在350℃硅氧四面体反应得到Na_2SiO_3,随升温转化为Na_4SiO_4.Employing homemade SiO_2 and analytic Zn_2SiO_4as rawmaterials and Na OH as reaction medium,the influences of reaction temperature,molar ratio of Na OH to SiO_2 and reaction time on the extraction ratio of silica were investigated. The appropriate reaction conditions were obtained as reaction temperature of 450 ℃,molar ratio of NaOH to SiO_2 of 2. 4 ∶ 1 and reaction time of 60 min. Silica reacted with Na OH to form Na_2 Si O_3 at first and then was transformed into Na_4SiO_4 along with temperature rising. The appropriate reaction conditions of Zn_2SiO_4 roasting were reaction temperature of 500 ℃,molar ratio of Na OH to Zn_2SiO_4of 20 ∶ 1and reaction time of 150 min. Na_2ZnSiO_4 and Na_2ZnO_2 were formed when Zn_2SiO_4reacted with NaOH. Silicon oxygen tetrahedron reacted with Na OH to form Na_2SiO_3 when the roasting temperature reached 350 ℃,and then Na_2SiO_3 was transformed into Na_4SiO_4.

关 键 词：氧化锌矿 二氧化硅 硅酸锌 碱熔融焙烧 反应过程 

分 类 号：TF813[冶金工程—有色金属冶金]