转底炉处理冶金粉尘工艺的锌钾钠脱除及烟气形成  

Study on mechanism of Zn,K,Na removal and flue gas formation in RHF direct reduction treat metallurgical dust process

作　　者：王静松[1] 杨慧贤[1] 佘雪峰[1] 曾晖 丁银贵[1] 薛庆国[1] 

机构地区：[1]北京科技大学教育部生态与循环冶金重点实验室冶金与生态工程学院,北京100083 [2]山东莱芜钢铁集团公司技术研发中心,山东莱芜271004

出　　处：《重庆大学学报（自然科学版）》2011年第3期82-88,共7页Journal of Chongqing University

基　　金：国家发改委循环经济示范工程(发改办高技[2007]3194号);中央高校基本科研业务费专项资金资助(FRF-MP-09-001A)

摘　　要：转底炉直接还原处理钢铁厂冶金粉尘过程中,Zn、K、Na等元素的脱除及烟气形成过程对转底炉工艺实施效果影响很大。采用高温管式炉模拟转底炉工艺条件,用钢铁厂含锌粉尘制成内配碳球团,进行直接还原实验研究,并收集实验过程产生的烟气和二次粉尘,对烟气中的气体成分以及烟气中的二次粉尘进行化学成分、微观结构以及物相组成分析。研究证明:Zn的脱除率可以达到98%,K、Na、Pb的脱除率分别达到80%、88%和85%;烟气中N2、CO、CO2的体积分数分别为71.4%、14.5%和14.1%;烟气中二次粉尘主要物相为ZnO、KCl、Zn5(OH)8Cl2H2O、PbO和NaCl,二次粉尘中ZnO含量高达80%,可作为二次锌资源加以利用。在此基础上分析了转底炉直接还原过程中Zn、Pb、K、Na脱除和烟气形成机理。In metallurgical dusts treating by RHF（rotary hearth furnace） direct reduction,processes of Zn,K,Na removal and flue gas formation have significantly influence on RHF process.Direct reduction experiment on cold bonded briquettes,made by mixing metallurgical zinc-bearing dusts with proper proportions,are investigated in a high temperature tube furnace simulated RHF.Ingredients,microstructures and phase compositions of flue gas and secondary dust are collected and analyzed.The results show that removal rates of Zn,K,Na and Pb are 98%,80%,88% and 85% respectively,gas ingredient of flue gas of N2,CO,CO2 are 71.4%,14.5% and 14.1% respectively,and phase compositions of secondary dust are ZnO,KCl,Zn5（OH）8Cl2H2O,PbO and NaCl.Studies show that ZnO content of secondary dust is up to 80%,which can be reused as secondary zinc resource.Then mechanism of removal of Zn,Pb,K and Na and forming of flue gas are analyzed in direct reduction process.

关 键 词：转底炉 粉尘 直接还原 脱锌 

分 类 号：TF556[冶金工程—钢铁冶金]