还原焙烧行为对冶金尘泥含碳球团结构及强度的影响  

Effects of reduction roasting behavior on the structure and strength of carbon-containing metallurgical dust pellets

作　　者：丁娟[1,2,3] 何环宇 唐忠勇 李杨[1,2,3] 刘虹灵[1,2,3] Ding Juan;He Huanyu;Tang Zhongyong;Li Yang;Liu Hongling(State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,China;Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education,Wuhan University of Science and Technology,Wuhan 430081,China;Hubei Provincial Engineering Technology Research Center of Metallurgical Secondary Resources,Wuhan University of Science and Technology,Wuhan 430081,China)

机构地区：[1]武汉科技大学省部共建耐火材料与冶金国家重点实验室,湖北武汉430081 [2]武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室,湖北武汉430081 [3]武汉科技大学湖北省冶金二次资源工程技术研究中心,湖北武汉430081

出　　处：《武汉科技大学学报》2021年第1期7-12,共6页Journal of Wuhan University of Science and Technology

基　　金：国家重点研发计划资助项目(2018YFC1900602).

摘　　要：以高炉瓦斯灰和转炉污泥为原料制备含碳球团,通过还原焙烧实验,考察了焙烧温度、焙烧时间以及球团配碳量对球团微观结构及强度的影响。结果表明,升高还原温度、延长还原时间均使得球团内金属铁相连晶增加、孔隙减少且金属铁相、浮氏体及渣相连结增强,球团抗压强度提高,特别是升高温度对改善球团微观结构并提高球团抗压强度的作用最为显著,而球团配碳量的增加导致还原后的球团内部灰分及残碳增多,将铁相连晶分割成大小不一的片区,破坏了铁相聚集连续性,且球团中孔洞及脆性残碳增多,球团强度降低。因此,在控制较低球团配碳量的条件下,在还原焙烧过程中选择较高的温度及较长的时间,冶金尘泥含碳球团可获得较高的抗压强度。Carbon-containing pellets were prepared by using BF gas dust and converter sludge as raw materials.The effects of reduction roasting temperature,time and pellet carbon content on the microstructure and strength of the pellets were investigated through reduction roasting experiments.The results show that with the raising of the reduction roasting temperature and the prolonging of the process,the number of the iron joined crystals in the pellets is increased,the pores are reduced,the joint of metallic iron phases,wustite and slag phases is strengthened,and the compressive strength of the pellets is increased.Temperature increase contributes most to the improvement of the microstructure and compressive strength of the pellets.The increase of the pellet carbon content leads to the increase of ash and residual carbon in the reduced pellets by which the iron joined crystals are devided into lots of tiny little pieces and the continuity of iron phase aggregation is destroyed.The pores and brittle residual carbon in the pellets increase and the compressive strength of the pellets decreases.Therefore,under the condition of lower carbon content of the pellets,the carbon-containing metallurgical dust pellets can obtain higher compressive strength by choosing higher temperature and longer time during the reduction roasting process.

关 键 词：冶金尘泥 含碳球团 还原焙烧 微观结构 抗压强度 

分 类 号：TF09[冶金工程—冶金物理化学]