Diffusion and reaction mechanism of limestone and quartz in fluxed iron ore pellet roasting process

作     者：Yufeng Guo Jinlai Zhang Shuai Wang Jianjun Fan Haokun Li Feng Chen Kuo Liu Lingzhi Yang Yufeng Guo;Jinlai Zhang;Shuai Wang;Jianjun Fan;Haokun Li;Feng Chen;Kuo Liu;Lingzhi Yang

作者机构：School of Minerals Processing and BioengineeringCentral South UniversityChangsha 410083China Technology CenterTaiyuan Iron Steel(Group)Co.Ltd.(TISCO)Taiyuan 030003China 

基　　金：support of Shanxi Province Major Science and Technology Projects China (No.20191101002) 

出 版 物：《International Journal of Minerals,Metallurgy and Materials》 (矿物冶金与材料学报（英文版）)

年 卷 期：2024年第31卷第3期

页      码：485-497页

摘      要：The increase to the proportion of fluxed pellets in the blast furnace burden is a useful way to reduce the carbon emissions in the ironmaking *** this study,the interaction between calcium carbonate and iron ore powder and the mineralization mechanism of fluxed iron ore pellet in the roasting process were investigated through diffusion couple *** electron microscopy with energy dispersive spectroscopy was used to study the elements’diffusion and phase transformation during the roasting *** results indicated that limestone decomposed into calcium oxide,and magnetite was oxidized to hematite at the early stage of *** the increase in roasting temperature,the diffusion rate of Fe and Ca was obviously accelerated,while the diffusion rate of Si was relatively *** order of magnitude of interdiffusion coefficient of Fe_(2)O_(3)-CaO diffusion couple was 10^(−10) m^(2)·s^(−1) at a roasting temperature of 1200℃for 9 ***_(2)Fe_(2)O_(5) was the initial product in the Fe_(2)O_(3)-CaO-SiO_(2) diffusion interface,and then Ca_(2)Fe_(2)O_(5) continued to react with Fe_(2)O_(3) to form CaFe_(2)O_(4).With the expansion of the diffusion region,the sillico-ferrite of calcium liquid phase was produced due to the melting of SiO_(2) into CaFe_(2)O_(4),which can strengthen the consolidation of fluxed ***,andradite would be formed around a small part of quartz particles,which is also conducive to the consolidation of fluxed *** addition,the principle diagram of limestone and quartz diffusion reaction in the process of fluxed pellet roasting was discussed.

主 题 词：fluxed iron ore pellet limestone hematite quartz diffusion reaction 

学科分类：0819[工学-海洋工程类] 0806[工学-电气类] 08[工学] 0805[工学-能源动力学] 080601[080601] 

核心收录：

D　O　I：10.1007/s12613-023-2739-x

馆 藏 号：203126709...