Preparing high-purity iron by direct reduction?smelting separation of ultra-high-grade iron concentrate  

作　　者：Feng Li Qing-jie Zhao Man-sheng Chu Jue Tang Zheng-gen Liu Jia-xin Wang Sheng-kang Li 

机构地区：[1]School of Metallurgy,Northeastern University,Shenyang 110819,China [2]State Key Laboratory of Rolling and Automation,Northeastern University,Shenyang 110819,China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2020年第4期454-462,共9页矿物冶金与材料学报（英文版）

基　　金：the National Natural Science Foundation of China(No.51904063);the Fundamental Research Funds for the Central Universities,China(Nos.N172503016,N172502005,and N172506011);the China Postdoctoral Science Foundation(No.2018M640259).

摘　　要：A new process for preparing high-purity iron(HPI)was proposed,and it was investigated by laboratory experiments and pilot tests.The results show that under conditions of a reduced temperature of 1075°C,reduced time of 5 h,and CaO content of 2.5wt%,a DRI with a metallization rate of 96.5%was obtained through coal-based direct reduction of ultra-high-grade iron concentrate.Then,an HPI with a Fe purity of 99.95%and C,Si,Mn,and P contents as low as 0.0008wt%,0.0006wt%,0.0014wt%,and 0.0015wt%,respectively,was prepared by smelting separation of the DRI using a smelting temperature of 1625°C,smelting time of 45 min,and CaO content of 9.3wt%.The product of the pilot test with a scale of 0.01 Mt/a had a lower impurity content than the Chinese industry standard.An HPI with a Fe purity of 99.98wt%can be produced through the direct reduction?smelting separation of ultra-high-grade iron concentrate at relatively low cost.The proposed process shows a promising prospect for application in the future.

关 键 词：ultra-high-grade IRON concentrate HIGH-PURITY IRON coal-based direct reduction SMELTING SEPARATION pilot test 

分 类 号：TF591[冶金工程—钢铁冶金]