碱度及MgO质量分数对球团焙烧及冶金性能的影响  

Influence of pellet basicity and MgO content on roasting and metallurgical properties of pellets

作　　者：朱德庆[1] 高子富 潘建[1] 春铁军[1] 杨聪聪[1] 

机构地区：[1]中南大学资源加工与生物工程学院,湖南长沙410083

出　　处：《中南大学学报（自然科学版）》2013年第10期3963-3970,共8页Journal of Central South University:Science and Technology

基　　金：国家火炬计划重点项目(2011GH561685)

摘　　要：为了改善球团性能及降低COREX能耗,在球团制备过程中加入熔剂。通过调节球团碱度（0.8～2.2）及MgO质量分数（0.5%～2.5%）,研究球团焙烧行为及其冶金性能。结果表明：当MgO质量分数为0.25%～1.50%时,随着碱度从0.8提高到1.2,焙烧球团抗压强度升高,达到最大值;随后碱度（1.6～2.2）增加,焙烧球团抗压强度下降;当球团中MgO质量分数升高到2.5%时,焙烧球团抗压强度随着碱度（0.8～2.2）升高而急剧下降;当碱度（0.8～2.2）固定时,随着MgO质量分数增加,球团抗压强度呈下降趋势。同时提高碱度和MgO质量分数可改善球团冶金性能;制备的含镁熔剂性球团（w（MgO）=0.25%～2.5%,碱度R=0.8～1.6）荷重还原度均在79%以上,还原膨胀率低于15%,低温还原粉化指数RDI_-3.15 mm大部分低于5%,软化温度〉940℃,熔化温度〉1 260℃,为优良的COREX入炉炉料。In order to improve the properties of pellets and reduce the energy consumption of COREX, flux was added to the pellets in the process of production. Flux pellets were prepared with varying basicity （0.8-2.2） and MgO content （0.5%-2.5%） and the roasting behaviour of pellets and metallurgical properties were studied. The results show that the compressive strength of the pellets increases to the maximum with increasing basicity （0.8-1.2） under MgO content ranging from 0.25% to 1.5%. Pellets compressive strength decreases with increasing basicity （1.6-2.2） when MgO content is 2.5%. Pellets compressive strength decreases with increasing MgO content as the basicity （0.8-2.2） is fixed. The increasing basieity and MgO content in pellets could improve metallurgical properties. The prepared magnesium-bearing fluxed pellets （w（MgO）=0.25%-2.5%）, R=0.8-1.6） have high reduction degree under load （〉79%）, low reduction swelling index （〈 15%）, low temperature degradation indices （〈5%）, high softening temperature （〉940 ℃） and melting temperature （〉 1 260 ℃）. So the pellets is a good charging raw material for COREX.

关 键 词：COREX 熔剂性球团 抗压强度 冶金性能 

分 类 号：TF046[冶金工程—冶金物理化学]