LF精炼渣碳酸化过程Ca赋存状态转变  

Change of Ca occurrence state in carbonation process of LF refining slag

作　　者：杜昀聪 伊元荣[1,2,3] 白书齐 马忠乐 方明航 马文青 DU Yun-cong;YI Yuan-rong;BAI Shu-qi;MA Zhong-le;FANG Ming-hang;MA Wen-qing(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》2020年第3期195-203,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(BS120119)。

摘　　要：为提高LF精炼渣资源化利用效率,对精炼渣碳酸化过程中Ca赋存状态转变进行了研究。通过碳酸化实验确定了温度为20℃,液固比为5,通气量为600 mL/min,转速为700 rad/min,粒径小于88μm时碳酸化效果最好,并探究了不同pH条件下Ca^2+、HCO3^-、CO3^2-的浓度变化。在此基础上,利用XRD、SEM、TG-DTA、FT-IR等方法对碳酸化前后精炼渣进行了表征分析。XRD分析表明,f-CaO、Ca2SiO4、Ca3Al2(SiO4)3衍射峰强度减弱,碳酸化后主要产物为CaCO3;DG-DTA分析表明,碳酸化产物在600~800℃失重率达13.35%;SEM分析表明,生成的CaCO3颗粒聚集附着在精炼渣颗粒表面;FT-IR表明,碳酸化后产生大量碳酸盐,并多为方解石晶型。In order to improve utilization efficiency of LF refining slag, the change of Ca occurrence state during carbonation of refining slag was studied. The carbonation experiments were carried out to determine the process parameters:temperature of 20 ℃, liquid-solid ratio of 5, aeration volume of 600 mL/min, rotation speed of 700 rad/min and particle size of less than 88 μm. Under the above conditions, the carbonation effect is the best, the concentration changes of Ca^2+, HCO3^-, CO3^2- under different pH conditions was explored. XRD, SEM, TG-DTA and FT-IR were used to characterize the refining slag before and after carbonation. XRD analysis shows that intensity of f-CaO, Ca2SiO4 and Ca3Al2(SiO4)3 and diffraction peaks become weak after carbonation, and the main product is CaCO3;DG-DTA analysis shows that weight loss rate of carbonated products reaches 13.35% at 600-800 ℃. SEM analysis shows that the generated CaCO3 particles aggregate and adhere to the surface of the refined slag particles;FT-IR shows that after carbonation, a large amount of carbonate is produced, and most of them are in the form of calcite.

关 键 词：精炼渣 钙赋存 碳酸化 表征分析 

分 类 号：TF769[冶金工程—钢铁冶金]