国内铁精矿粉制备气基竖炉专用高品位球团矿  

PREPARATION OF IRON ORE CONCENTRATE POWDER IN DOMESTIC HIGH-GRADE PELLETS FOR GAS-BASED SHAFT FURNACES

作　　者：魏晓光 Wei Xiaoguang(HBIS Group Zhangxuan Science and Technology Hydrogen Metallurgy Company,Xuanhua 075100,Hebei)

机构地区：[1]河钢集团张宣科技氢冶金公司,河北宣化075100

出　　处：《河北冶金》2024年第1期13-18,共6页Hebei Metallurgy

基　　金：第七批万人计划(ZX20220553)。

摘　　要：随着钢铁行业碳减排压力的增大,气基竖炉-电炉短流程工艺的应用可有效降低碳排放,高品位球团矿作为气基竖炉冶炼原料,其制备过程及特性研究尤为重要。本文使用国内6种不同的铁精矿粉制备高品位球团矿,阐述了球团矿的制备过程,研究了球团矿的性能。结果表明:最佳配矿方案为70%矿粉1+30%矿粉2,此配矿生球抗压强度为11 N/球,落下强度为3.1次/球;配矿球团矿w(FeO)为1.00%,铁精矿成品球团矿w(FeO)≥0.59%,亚铁含量较低,氧化充分,球团矿质量受控;配矿成品球团矿的抗压强度达到3031 N/球,铁精矿成品球团矿抗压强度≥3200 N/球,质量满足生产要求;还原性指数≥4.000,还原膨胀指数≥7.45%,LTD_(+6.3)≥97.00%,LTD_(UP)均为100%,还原性能良好。通过对现有设备的技术改造及配矿方案的优化,使用国内铁精矿粉可以制备出满足气基竖炉生产标准的优质高品位球团矿。With the increasing pressure of carbon emission reduction in the iron and steel industry,the application of gas-based shaft furnace-electric furnace short-process process can effectively reduce carbon emissions,and the preparation process and characteristics of high-grade pellets as raw materials for gas-based shaft furnace smelting are particularly important.In this paper,six different kinds of iron concentrate powders in China are used to prepare high-grade pellets,the preparation process of pellets is described,and the properties of pellets are studied.The results show that the optimal blending scheme is as follows:the mass of ore powder 1 accounts for 70%,the mass of ore powder 2 accounts for 30%,the compressive strength of the ore blending pellet is 11 N/ball,the falling strength is 3.1 times/ball,the ore blending pellet w(FeO)is 1.00%,the iron concentrate pellet w(FeO)is≥0.59%,the ferrous content is low,the oxidation is sufficient,and the pellet quality is controlled,the compressive strength of the finished ore pellet reaches 3031 N/ball,and the compressive strength of the iron concentrate pellet is≥3200 N/ball.The reducibility index≥4.000,the reductive expansion index≥7.45%,LTD_(+6.3)≥97.00%,and the LTD_(UP) were all 100%,and the reduction performance was good.Through the technical transformation of the existing equipment and the optimization of the ore blending scheme,the use of domestic iron concentrate powder can be used to prepare high-quality and high-grade pellets that meet the production standards of gas-based shaft furnaces.

关 键 词：铁精粉 高品位球团矿 气基竖炉 还原性 还原膨胀指数 LTD+6.3 LTD UP 

分 类 号：TF341[冶金工程—冶金机械及自动化]