不同温度下精炼渣碳酸化微观结构变化  

Microstructure changes of refining slag under carbonization at different reaction temperatures

作　　者：伊元荣[1,2,3] 马忠乐 杜昀聪 白书齐 YI Yuanrong;MA Zhongle;DU Yuncong;BAI Shuqi(College of Resources and Environmental Sciences,Xinjiang University,Urumqi 830046,Xinjiang,China;Key Laboratory of Oasis Ministry of Education,Xinjiang University,Urumqi 830046,Xinjiang,China;Key Laboratory of Smart City and Environmental Modeling Autonomous Region,Urumqi 830046,Xinjiang,China)

机构地区：[1]新疆大学资源与环境科学学院,新疆乌鲁木齐830046 [2]新疆大学绿洲教育部重点实验室,新疆乌鲁木齐830046 [3]智慧城市与环境建模自治区高校重点实验室,新疆乌鲁木齐830046

出　　处：《钢铁研究学报》2021年第2期127-135,共9页Journal of Iron and Steel Research

基　　金：国家自然科学基金资助项目(51868072);新疆自然科学基金资助项目(2017D01C024);新疆大学博士生科研启动基金资助项目(BS120119)。

摘　　要：为了研究不同反应温度条件下精炼渣矿相成分在碳酸化过程中微观结构特征变化,在不同碳酸化反应温度20、40、60、80℃下,采用X射线衍射(XRD)、扫描电镜(SEM)、热重(TG-DTG)、29Si固体核磁共振等测试方法分析了精炼渣碳酸化特征变化。结果表明,随着碳酸化反应温度的升高,精炼渣与反应产物CaCO3的粒径逐渐增加;精炼渣碳酸化反应由外向内进行,生成了大量的颗粒状碳酸钙,结构变得致密均匀。20℃下精炼渣碳酸化过程中C2S(Ca2SiO4)、C3S(Ca3SiO5)生成C-S-H(水化硅酸钙)凝胶,进而C-S-H凝胶发生脱钙现象,Ca2+与CO32-结合生成稳定的CaCO3,碳酸化产物500~850℃失重率达35.26%,有利于碳酸化反应的进行。In order to study the microstructure changes of the mineral composition of refining slag during carbonation process at different temperature conditions(20, 40, 60 and 80 ℃), X-ray diffraction(XRD), scanning electron microscopy(SEM), thermogravimetric analysis(TG-DTG) and 29Si nuclear magnetic resonance(29 Si NMR) were carried out to analyze the carbonation reaction. The experiment results show that the particle size of the refining slag and the reaction product CaCO3 gradually increase with increasing of the carbonation reaction temperature. The carbonation reaction of the refining slag proceeds from the outside to the inside, which produces a large amount of granular calcium carbonate, and therefore the microstructures of reaction product become dense and uniform. In the carbonation process of refining slag at 20 ℃, C2S(Ca2SiO4) reacts with C3S(Ca3SiO5) to form C-S-H, and then the C-S-H gel decalcifies, resulting in the CaCO3 production through the combination of Ca2+与CO32-. The weight loss rate of the carbonation product is up to 35.26% at 500-850 ℃, which is helpful to the carbonation reaction.

关 键 词：精炼渣 物理特性 微观结构 29Si NMR 

分 类 号：TF769[冶金工程—钢铁冶金]