Kinetics of solid-state reduction of chromite overburden  

作　　者：Saida Shaik Zhiyuan Chen Preeti Prakash Sahoo Chenna Rao Borra 

机构地区：[1]Metallurgical and Materials Engineering Department,Indian Institute of Technology Kharagpur,Kharagpur,West Bengal 721302,India [2]VITO-Flemish Institute for Technological Research,Boeretang 200,B-2400 Mol,Belgium [3]Research and Development Division,Tata Steel Ltd.,Jamshedpur 831001,India

出　　处：《International Journal of Minerals,Metallurgy and Materials》2023年第12期2347-2355,共9页矿物冶金与材料学报（英文版）

摘　　要：The demand for alternative low-grade iron ores is on the rise due to the rapid depletion of high-grade natural iron ore resources and the increased need for steel usage in daily life.However,the use of low-grade iron ores is a constant clinical task for industry metallurgists.Direct smelting of low-grade ores consumes a substantial amount of energy due to the large volume of slag generated.This condition can be avoided by direct reduction followed by magnetic separation(to separate the high amount of gangue or refractory and metal parts)and smelting.Chromite overburden(COB)is a mine waste generated in chromite ore processing,and it mainly consists of iron,chromium,and nickel(<1wt%).In the present work,the isothermal and non-isothermal kinetics of the solid-state reduction of self-reduced pellets prepared using low-grade iron ore(COB)were thoroughly investigated via thermal analysis.The results showed that the reduction of pellets followed a firstorder autocatalytic reaction control mechanism in the temperature range of 900-1100℃.The autocatalytic nature of the reduction reaction was due to the presence of nickel in the COB.The apparent activation energy obtained from the kinetics results showed that the solid-state reactions between COB and carbon were the rate-determining step in iron oxide reduction.

关 键 词：chromite overburden solid-state reduction KINETICS autocatalytic reaction 

分 类 号：TF51[冶金工程—钢铁冶金]