| 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Na2CO3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Na2CO3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. |
| 关键词: 钢渣 碳化 Na2CO3溶液 二氧化硅 |
| DOI：10.3969/j.issn.1007-9629.2024.10.011 |
| 分类号:TU521.4 |
| 基金项目:中国建材集团关键核心技术攻关“揭榜挂帅”项目（2021HX0506） |
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| High-Efficiency Carbonation of Steel Slag and Preparation of Amorphous Silica |
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XU Mingchao, ZHENG Keren, ZHANG Zhenqing, CHEN Lou, YUAN Qiang
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School of Civil Engineering， Central South University， Changsha 410075， China
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| Abstract: |
| 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 Na2CO3 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 Na2CO3 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. |
| Key words: steel slag carbonation Na2CO3 solution silica |
