Effect of Thermal Charging of Iron Ore Pellets on the Reduction Rate and Compressive Strength in Gas-based Reduction Process
Burden in gas-based direct reduction process is iron ore oxide pellet,which has experienced oxide roasting and cooling before reduction.However,it would be heated again in the reduction process.This may cause much energy waste and adverse effects on reduction process.In this paper,roasted pellets with and without cooling were charged for gas-based reduction respectively.The reduction rate and compressive strength during reduction were studied to reveal the effects of charging methods.Results showed that there is little difference on reduction rate between the two.However,the compressive strength of reduced pellets via thermal charging improves obviously.And nucleation and growth mechanisms of iron crystal grain in gas-based reduction were investigated by optical microscope (Leica DMR P).The iron crystal nucleuses firstly form at the interface of grains and edge of wustite,and then gradually grow from surface layer to inner core as reduction proceeds.Thermal charging can promote the migration and accumulation of iron crystal grain effectively.
iron ore pellets thermal charging reduction rate compressive strength
Zhu-cheng Huang Dao-guang Yang Ling-yun Yi
School of Minerals Processing and Bioengineering, Central South University,Changsha 410083, China
国际会议
西安
英文
262-266
2012-08-24（万方平台首次上网日期，不代表论文的发表时间）