磁铁矿球团金属化烧结  

Metallization sintering of magnetite pellets

作　　者：陈麒公 潘建[1,2] 朱德庆[1,2] 郭正启[1,2] 杨聪聪[1,2] 李思唯 CHEN Qigong;PAN Jian;ZHU Deqing;GUO Zhengqi;YANG Congcong;LI Siwei(School of Minerals Processing and Bioengineering,Central South University,Changsha 410083,Hunan,China;Low-Carbon and Hydrogen Metallurgy Research Center,Central South University,Changsha 410083,Hunan,China)

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 [2]中南大学低碳与氢冶金研究中心,湖南长沙410083

出　　处：《钢铁》2023年第10期12-22,共11页Iron and Steel

基　　金：国家自然科学基金资助项目(52174329,52004339);。

摘　　要：在“双碳”背景下,强化高炉冶炼是促进铁前工序低碳减排的重要方向之一,一定比例的金属化炉料可显著降低高炉焦比和提高生产率。以100%细粒磁铁精矿为原料,提出了铁精矿球团金属化烧结新工艺。在生球水分为7.5%,生石灰调节碱度至1.0,生球落下强度为6.0次/0.5 m、抗压强度为15.85 N/个、爆裂温度为500℃的前提条件下,优化了球团金属化烧结工艺参数,考察了不同燃料种类及配入方式、总C/Fe质量比、燃料分加比例、碱度等条件对金属化烧结矿产质量指标的影响,并对所得金属化烧结矿的冶金性能进行了评价。此外,还观察和测量了所得预还原烧结矿不同矿物相的形态、数量和成分。结果表明,在料层高度为300 mm、总C/Fe质量比为0.4、内配无烟煤和外配烟煤、预热温度为450℃的球团金属化烧结条件下,所得预还原烧结矿的金属化率、全铁品位分别达到43.79%和68.10%,成品率为76.32%,转鼓强度为78.10%,利用系数为0.41 t/(m^(2)·h)。经矿相分析,金属化烧结矿主要由金属铁、浮氏体和渣相组成,且FeO质量分数较高,Fe_(2)O_(3)质量分数较低。金属铁在浮氏体和残碳周围呈密集分布。观察料柱自上而下金属铁的质量分数逐渐增加,浮氏体和残碳质量分数呈现递减趋势。此外,液相固结和金属键连接是金属化球团烧结的主要固结方式。预还原烧结矿总还原度为85.79%,还原强度指数和还原粉化指数分别为90.82%和92.52%,具有非常优良的抗低温还原粉化性能。Under the background of"dual carbon",strengthening blast furnace smelting is one of the important directions to promote low-carbon emission reduction in the ironmaking process.A certain proportion of metallized burden can significantly reduce the coke ratio and increase the productivity of blast furnace.A new process of pre-reduction sintering of iron ore pellets with 100%magnetite concentrate as raw material was proposed.The process parameters of pellet metallization sintering were optimized under the premise conditions of green ball moisture at 7.5%,basicity at 1.0 by burntlime adjustment,drop strength of green ball with 6.0 times/0.5 m,compressive strength of 15.85 N/piece,thermal shock temperature at 500℃.The effects of different fuel types and addition methods,total C/Fe mass ratio,fuel distribution ratio,basicity and other conditions on the quality indicators of pre-reduced sinter were investigated.The metallurgical performance of the obtained pre-reduced sinter was evaluated.In addition,the morphology,quantity and composition of the different mineral phases of the resulting pre-reduced sinter were observed and measured.The results showed that under the pellet metallization sintering conditions of bed height of 300 mm,total C/Fe mass ratio of 0.4,internal addition anthracite and external addition bituminous coal,preheating temperature at 450℃,the metallization rate and total iron grade of the pre-reduced sinter reached 43.79%and 68.10%,respectively.The yield of pre-reduced sinter was 76.32%,tumble index was 78.10%,productivity was 0.41 t/(m^(2)·h).The ore phase analysis shows that the pellet metallization sintering is mainly composed of metallic iron,fulvic and residual phases and has a high FeO content and a low Fe_(2)O_(3) content.The metallic iron is densely distributed around the fulvic and residual carbon.From the top to the bottom of the column,the content of metallic iron increases,while the content of fulvic and residual carbon shows a decreasing trend.In addition,liquid phase consolidation and

关 键 词：金属化烧结 铁精矿 减碳 球团 强度指数 

分 类 号：TF046.4[冶金工程—冶金物理化学]