温度对粉煤灰-硫酸渣共还原制备铁硅合金过程的影响  

Effect of temperature on preparation of iron-silicon alloy by coreduction of fly ash and sulfuric acid residue

作　　者：雷家柳 李洁 寇勇勇 裴新平 万凯 付勇军 LEI Jialiu;LI Jie;KOU Yongyong;PEI Xinping;WAN Kai;FU Yongjun(Hubei Polytechnic University School of Materials Science and Engineering,Huangshi 435003,Hubei,China;Hubei Polytechnic University Hubei Engineering Research Center for Collaborative Technology of Advanced Material Manufacturing and Solid Waste Recycling,Huangshi 435003,Hubei,China;Hubei Guoan Special Steel Inspection and Testing Co.,Ltd.,Huangshi 435000,Hubei,China)

机构地区：[1]湖北理工学院材料科学与工程学院,湖北黄石435003 [2]湖北理工学院先进材料制造与固废资源化协同技术湖北省工程研究中心,湖北黄石435003 [3]湖北国安特殊钢检验检测有限公司,湖北黄石435000

出　　处：《烧结球团》2022年第6期91-98,共8页Sintering and Pelletizing

基　　金：国家自然科学基金青年科学基金资助项目(51704105);湖北理工学院校级重点项目(21xjz01A)。

摘　　要：本文以粉煤灰和硫酸渣为研究对象,采用热力学分析及高温试验探索粉煤灰-硫酸渣固废体系协同共还原制备铁硅合金的共还原机理,以及焙烧温度对还原产物微观结构演变特征及物相转化规律的影响。结果表明:铁硅合金内存在多种物相组成,硫酸渣主要物相有助于促进粉煤灰中莫来石相和石英相还原。XRD分析表明,当还原温度为1 150、1 200℃时,焙烧产品中合金相主要为Fe_(3)Si;超过1 250℃后Fe_(3)Si相完全消失;在1 300~1 400℃温度区间,铁硅合金主要以Fe_(5)Si_(3)相存在。SEM-EDS分析表明,铁硅合金颗粒呈球形,当反应温度为1 150℃时,表面有着大小不一致的含铝、硅、氧凸包;当反应温度为1 250℃时,铁硅合金表面的凸包颗粒尺寸变小;当反应温度提高到1 350℃时,铁硅合金表面凸包尺寸更为细小,数量明显减少。本文研究成果可为其他共还原因素对粉煤灰与硫酸渣共还原体系的影响提供指导,继而为实现粉煤灰与硫酸渣固废体系的全资源化利用奠定基础。In this paper,fly ash and sulfuric acid residue are taken as the research objects,thermodynamic analysis and high-temperature test are adopt to explore the coreduction mechanism of preparing iron-silicon alloy and the influence of calcination temperature on microstructure evolution characteristics and phase transformation law of reduction products prepared by coreduction of fly ash-sulfuric acid residue solid waste system.The results show that there are various phase compositions between iron-silicon alloys,and the main phase of sulfuric acid residue is helpful to promote the reduction of mullite phase and quartz phase in fly ash.XRD analysis shows that the alloy phase in the calcination product is mainly Fe_(3)Si at the reduction temperature of 1 150 and 1 200 ℃.When the temperature exceeds 1 250 ℃,Fe_(3)Si phase disappears completely.In the temperature range of 1 300~1 400 ℃,iron-silicon alloy mainly exists in the form of Fe_(5)Si_(3).SEM-EDS analysis shows that the iron-silicon alloy particles are spherical,and when the reaction temperature is 1 150 ℃,the surface has convex hull containing aluminum,silicon and oxygen with different sizes.When the temperature is 1 250 ℃,the size of convex hull particles on the surface of iron-silicon alloy becomes smaller.When the reaction temperature is increased to 1 350 ℃,the convex hull size on the surface of iron-silicon alloy is smaller and the number is obviously reduced.The research results can provide guidance for the influence of other coreduction factors on the coreduction system of fly ash and sulfuric acid residue,and then lay a foundation for the full resource utilization of the solid waste system of fly ash and sulfuric acid residue.

关 键 词：硫酸渣 粉煤灰 焙烧温度 共还原 铁硅合金 

分 类 号：TF645[冶金工程—钢铁冶金] TF09