Effect of atmosphere and basicity on softening-melting behavior of primary slag formation in cohesive zone  

作　　者：Bin-bin Lyu Guang Wang Lian-da Zhao Hai-bin Zuo Qing-guo Xue Jing-song Wang 

机构地区：[1]State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing,Beijing,100083,China

出　　处：《Journal of Iron and Steel Research International》2023年第2期227-235,共9页

基　　金：The authors gratefully acknowledge the financial support of the National Natural Science Foundation of China(Nos.U1960205 and 51804024).

摘　　要：The softening-melting characteristics of ferrous burden play a crucial role in the thickness and position of the cohesive zone.The influence of the basicity and experimental atmosphere on the softening-melting behavior of primary slag under slag-coke interaction was investigated using in situ visualization method.The mechanism was analyzed using the FactSage software,X-ray diffraction,and electron probe microanalysis.The softening and melting temperatures of the samples increased with increasing basicity under different atmospheres.The difference between softening and melting temperatures is smaller in a H_(2) atmosphere than in a CO atmosphere;in H_(2) atmosphere,the range of softening zone in the cohesive zone was significantly thinner.The formed low-melting-point FeO-bearing phases decrease when H_(2) was used as the reducing agent.In addition,according to FactSage calculations,the high content of metallic iron reduced in the H_(2) atmosphere raised the softening temperature of the primary slag.It also narrowed and moved downward the cohesive zone due to an increase in softening and melting temperatures.Meanwhile,the increase in basicity promoted the decrease in liquid ratio and improved the permeability of cohesive zone.

关 键 词：Primary slag Cohesive zone Softening-melting behavior Coke bed Interface characteristic 

分 类 号：TF4[冶金工程—钢铁冶金]