含锌粉尘的协同还原及其脱锌动力学研究  

Research on collaborative reduction of zinc-containing dust and its dezincification kinetics

作　　者：杨文招 郑富强 胡兵[3] 朱伊翔 胡佩伟[1,2] YANG Wenzhao;ZHENG Fuqiang;HU Bing;ZHU Yixiang;HU Peiwei(Wuhan University of Science and Technology School of Resources and Environmental Engineering,Wuhan 430081,Hubei,China;Wuhan University of Science and TechnologyHubei Province Key Laboratory for Efficient Utilization and Agglomeration of Metallurgic Mineral Resources,Wuhan 430081,Hubei,China;Zhongye Changtian International Engineering Co.,Ltd.,Changsha 410205,Hunan,China)

机构地区：[1]武汉科技大学资源与环境工程学院,湖北武汉430081 [2]武汉科技大学冶金矿产资源高效利用与造块湖北省重点实验室,湖北武汉430081 [3]中冶长天国际工程有限责任公司,湖南长沙410205

出　　处：《烧结球团》2025年第1期117-125,共9页Sintering and Pelletizing

基　　金：湖南省重点研发计划资助项目(2023SK2079)。

摘　　要：我国每年都会产生大量的含铁含锌粉尘,直接还原技术可以使粉尘中的Fe和Zn元素高效分离。本研究将转炉除尘灰、瓦斯泥和锌硫酸渣混匀后压制成团块,再外配25%的焦粉,在1000~1150℃范围内进行直接还原,揭示了含锌团块的还原过程和机理,并且建立了脱锌动力学模型。结果表明:提高还原温度或延长还原时间可以促进铁晶粒的聚集长大,有利于铁还原和锌脱除;在还原温度为1150℃条件下还原30 min后,可得到金属化率为98.74%和脱锌率为98.83%的金属化团块,还原过程中限制锌氧化物还原脱除速率的是界面化学反应,拟合置信度(R 2)为0.9936,表观活化能为152.37 kJ/mol。该研究可为含锌粉尘的协同还原及脱锌动力学提供理论基础。A large amount of iron-containing and zinc-containing dust is produced in China every year,and the direct reduction technology can make the Fe and Zn elements in the dust be separated efficiently.In this study,the converter dust removal ash,gas mud and zinc sulfuric acid residue are mixed and pressed into agglomerates,and then 25%coke powder is mixed and directly reduced in the temperature range of 1000~1150℃,which reveals the reduction process and mechanism of zinc-containing agglomerates,and establishes a dezincification kinetics model.The results show that increasing the reduction temperature or prolonging the reduction time can promote the aggregation and growth of iron grains,which is conducive to iron reduction and zinc removal.After 30 min of reduction at 1150℃,metallized aggregates with a metallization rate of 98.74%and a dezincification rate of 98.83%are obtained,and the interfacial chemical reaction limits the reduction and removal rate of zinc oxides during the reduction process,with a fitting confidence of 0.9936 and an apparent activation energy of 152.37 kJ/mol.This research provides a theoretical basis for the collaborative reduction and dezincification kinetics of zinc-containing dusts.

关 键 词：含锌粉尘 金属化率 协同还原 还原机理 脱锌动力学 

分 类 号：TF56[冶金工程—钢铁冶金] TF813[环境科学与工程—环境工程] X757