w(MgO)/w(Al_(2)O_(3))对烧结矿成矿特性及冶金性能的影响  

Effect of w(MgO)/w(Al_(2)O_(3))on sintered ore mineralization characteristics and metallurgical properties

作　　者：丁成义 杨涛[1] 龙红明[1,2] 韩凤光 邱金龙[3] 罗云飞 DING Cheng-yi;YANG Tao;LONG Hong-ming;HAN Feng-guang;QIU Jin-long;LUO Yun-fei(Anhui Province Key Laboratory of Metallurgy Engineering and Resources Recycling,Anhui University of Technology,Maanshan 243032,Anhui,China;School of Metallurgical Engineering,Anhui University of Technology,Maanshan 243032,Anhui,China;Research and Developments Centers,Shanghai Meishan Iron and Steel Co.,Ltd.,Nanjing 210039,Jiangsu,China;School of Minerals Processing and Bioengineering,Central South University,Changsha 410083,Hunan,China)

机构地区：[1]安徽工业大学冶金工程与资源综合利用安徽省重点实验室,安徽马鞍山243032 [2]安徽工业大学冶金工程学院,安徽马鞍山243032 [3]上海梅山钢铁股份有限公司技术中心,江苏南京210039 [4]中南大学资源加工与生物工程学院,湖南长沙410083

出　　处：《钢铁》2023年第3期25-33,共9页Iron and Steel

基　　金：国家自然科学基金青年基金资助项目(52204331);安徽省自然科学基金青年基金资助项目(2208085QE145);冶金减排与资源综合利用教育部重点实验室开放基金资助项目(JKF20-03)。

摘　　要：w(MgO)/w(Al_(2)O_(3))(以下简称镁铝比)作为铁矿粉烧结过程的重要成分参数之一,对烧结过程的成矿特性及烧结矿冶金性能的改善意义重大。运用FactSage热力学软件理论计算了烧结体系的平衡物相组成及液相组分变化规律,随着镁铝比由1.07降低至0.67,烧结矿中液相、铁氧化物等优质物相含量增加,尖晶石等劣质物相含量下降。烧结杯试验探究了不同镁铝比烧结矿的理论物相组成、产质量指标、显微结构及冶金性能变化规律,结果表明,随着镁铝比由1.07降低至0.67,烧结速度由29.57mm/min逐步提高至31.12mm/min;成品率由62.89%提高至64.12%,并在镁铝比为0.77时达到最大值65.56%;转鼓强度由54.67%提高至60.27%,并在镁铝比为0.77时达到最大值64.67%;利用系数先减小后增大;固体燃耗逐渐降低,并在镁铝比为0.77时达到相对低值74.53kg/t。随着镁铝比由1.07降低至0.67,烧结矿中铁酸钙含量先上升后降低,硅酸盐和磁铁矿含量变化较小,赤铁矿含量和孔洞量逐渐降低,镁铝比为0.77时达到最佳烧结矿物相组成。镁铝比为0.77水平的烧结矿较之基准烧结矿,还原度由73.11%提升至76.05%,低温还原粉化指数RDI_(>3.15)由72%稍降至70%,烧结矿的软化温度区间Δt_(sa)和熔滴温度区间Δt_(dm)分别由79、154℃降至65、149℃,熔滴性能总特性值S由1003kPa·℃降至823kPa·℃,烧结矿软熔性明显改善。As one of the important component parameters of the sintering process of iron ore powder,the w(MgO)/w(Al_(2)O_(3))has a great significance on the mechanism of sintering mineralization and the metallurgical properties of sinter.The equilibrium phase composition and liquid phase components of the sintering system were theoretically calculated by using FactSage thermodynamic software.With the decrease of w(MgO)/w(Al_(2)O_(3))from 1.07to 0.67,the content of liquid phase,iron oxide and other high-quality phases in the sintered ores increased and the con-tent of spinel and other inferior phases decreased.The sinter pot tests explored the theoretical phase composition,yield quality index,microstructure and metallurgical properties of sintered ores with different w(MgO)/w(Al_(2)O_(3)).The results show that the sintering speed gradually increases from 29.57 mm/min to 31.12 mm/min with the w(MgO)/w(Al_(2)O_(3))decreases from 1.07to 0.67.The yield increase from 62.89%to 64.12%,and reach the max-imum value 65.56%when w(MgO)/w(Al_(2)O_(3))is 0.77.The tumbler strength gradually increases from 54.67%to 60.27%,and reaches the maximum value of 64.67%when w(MgO)/w(Al_(2)O_(3))is 0.77.The utilization coefficient decreases first and then increase.The solid fuel consumption decreases gradually and reaches a relatively low value of 74.53kg/t when the w(MgO)/w(Al_(2)O_(3))is 0.77.With the w(MgO)/w(Al_(2)O_(3))from 1.07to 0.67,the content of calcium ferrite in sinter firstly increases and then decrease,the content of magnetite and silicate did not change obviously,and the content of hematite and the number of pores gradually decrease.The optimal composition of sin-ter mineral phase is reached when w(MgO)/w(Al_(2)O_(3))is 0.77.Compared with the benchmark sinter,the reduction degree of sinter with a w(MgO)/w(Al_(2)O_(3))of 0.77increased from 73.11%to 76.05%,the low temperature reduc-tion degradation index RDI_(>3.15)decreased slightly from 72%to 70%,the softening temperature rangeΔt_(sa)of sinter and the melt drop temperature rangeΔt_(d

关 键 词：烧结 镁铝比 成矿特性 冶金性能 矿相结构 复合铁酸钙 

分 类 号：TF046.4[冶金工程—冶金物理化学]