钢渣高效碳化及无定形二氧化硅制备  

High-Efficiency Carbonation of Steel Slag and Preparation of Amorphous Silica

作　　者：徐明超 郑克仁[1] 张禛庆 陈楼[1] 元强[1] XU Mingchao;ZHENG Keren;ZHANG Zhenqing;CHEN Lou;YUAN Qiang(School of Civil Engineering,Central South University,Changsha 410075,China)

机构地区：[1]中南大学土木工程学院,湖南长沙410075

出　　处：《建筑材料学报》2024年第10期955-961,共7页Journal of Building Materials

基　　金：中国建材集团关键核心技术攻关“揭榜挂帅”项目(2021HX0506)。

摘　　要：针对钢渣利用率低、处理方法效果差等问题,提出了一种以Na_(2)CO_(3)溶液为介质的钢渣高效碳化方式.研究了最佳反应参数,并对碳化产物及制备的二氧化硅进行了表征.结果表明:通过调控Na_(2)CO_(3)溶液浓度、反应温度、液固比、反应时间等参数,钢渣可以达到最大碳化程度78.60%;钢渣中硅酸盐相中的钙可以充分碳化,但存在于RO相-硅酸盐相固溶体中的钙碳化受限;可实现55.46%的二氧化硅提取率,提取制备得到的无定形二氧化硅纯度高达98.79%.研究结果为钢渣的固碳高值化利用提供了方向.In order to solve the problems of low utilization rate and poor treatment effect of steel slag,an efficient carbonation method of steel slag using Na_(2)CO_(3)solution as the medium was proposed.The optimal reaction parameters were investigated,the carbonation products and the silica prepared were characterized.The results indicate that by adjusting parameters such as Na_(2)CO_(3)solution concentration,reaction temperature,liquid-solid ratio and reaction time,the maximum carbonation degree of steel slag can reach 78.60%.Silicate phases in the steel slag can be completely carbonized,but the carbonation of calcium present in the RO phase(continuous solid solution mainly composed of FeO and MgO)-silicate phase solid solution in steel slag is limited.The extraction rate of 55.46%for silica can be achieved,with a purity of extracted amorphous silica gel as high as 98.79%.The research result provides a direction for the high-value utilization of steel slag.

关 键 词：钢渣 碳化 Na_(2)CO_(3)溶液 二氧化硅 

分 类 号：TU521.4[建筑科学—建筑技术科学]