工程科学学报，第38卷，第7期：913919,2016年7月 Chinese Journal of Engineering,Vol.38,No.7:913-919,July 2016 DOI:10.13374/j.issn2095-9389.2016.07.004:http://journals.ustb.edu.cn S0,对烧结矿冶金性能及微观结构的影响 闫志武”，张建良”，张亚鹏”，陈子罗”，王耀祖”，高斌区，张艳》 1)北京科技大学治金生态与工程学院，北京1000832)青岛特殊钢铁有限公司，青岛266043 ☒通信作者，E-mail:gaobin3747@163.com 摘要为给高铁低硅烧结矿的生产提供理论依据，设计烧结矿碱度R为1.8、1.9和2.0，每种碱度下以Si02含量为变量， 产生12组配矿方案进行烧结杯实验，研究S0,对烧结矿冶金性能及微观结构的影响.结果表明：S02质量分数从4.8%~ 5.7%增加时，其冷态强度逐渐增加，最大增幅为8%：烧结矿还原性逐渐降低，降幅区间为从86.80%到81.01%：还原粉化指 数RDI,5逐渐增大，增幅区间为从75.95%到87.21%；对于软熔性能，其软化开始温度T。在4.8%~5.4%的Si02含量区间 先升高，在5.4%-5.7%之间又降低，而软化区间有变宽的趋势.选定一个碱度水平R=2.0,烧结矿Si02质量分数在4.8% 一5.7%范围变化时，其微观结构由熔蚀状向针柱状发展，结构均匀性逐渐提高，主要矿物组成由赤铁矿向铁酸钙发展，且低 温还原粉化的骸晶状赤铁矿逐渐消失 关键词烧结：二氧化硅：治金性能：微观结构 分类号TF046 Effects of SiO,on the metallurgical properties and microstructure of sinter YAN Zhi-wu,ZHANG Jian-liang",ZHANG Ya-peng,CHEN Zi-uo,WANG Yao-u,GAO Bin,ZHANG Yan?) 1)School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China 2)Qingdao Special Steel Co.,Ltd.,Qingdao 266043,China Corresponding author,E-mail:gaobin3747@163.com ABSTRACT In order to provide a theoretical basis for the production of high iron and low silica sinter,the basicity (R)was set to 1.8,1.9 and 2.0,the Si0,content was variable for each alkalinity,and then 12 groups of ore blending schemes were generated to proceed with sinter pot tests.After that,the influences of SiO on the metallurgical properties and microstructure of sinter were re- searched.The results show that when the Si0,content increases from 4.8%to 5.7%,the cold intensity gradually increases,and the greatest growing rate is 8%:the sinter reducibility tends to lower,and the decreasing range is from 86.80%to 81.01%;the reduc- tion degradation index (RDI.3.s)gradually increases,and the growing range is from 75.95%to 87.21%.For softening-melting properties,the apparent initial softening temperature (To)previously increases in the range from 4.8%to 5.4%and then decreases in the range from 5.4%to 5.7%,and the softening range has a widening trend.Selected a alkalinity level R=2.0,when the SiO content changes in the range of 4.8%to 5.7%,the microstructure of sinter develops from an ablation shape to a needlelike and co- lumnar shape,the structural uniformity gradually improves,and the main mineral composition changes from hematite to calcium fer- rite.Skeletal crystalline hematite,which leads to a low temperature reduction degradation phenomenon,gradually disappears. KEY WORDS ore sintering:silicon dioxide:metallurgical properties:microstructure 烧结矿是国内高炉炼铁的主要原料，其质量将直 铁低硅的烧结矿，一般认为高品质烧结矿其S0,含量 接影响到高炉炉况和钢铁产量.目前我国高炉追求高 应小于5%，这样的烧结矿有利于降低高炉渣量，保证 收稿日期：201507-24 基金项目：国家自然科学基金资助项目(51174023,01260202)工程科学学报，第 38 卷，第 7 期: 913--919，2016 年 7 月 Chinese Journal of Engineering，Vol． 38，No． 7: 913--919，July 2016 DOI: 10． 13374 /j． issn2095--9389． 2016． 07． 004; http: / /journals． ustb． edu． cn SiO2 对烧结矿冶金性能及微观结构的影响 闫志武1) ，张建良1) ，张亚鹏1) ，陈子罗1) ，王耀祖1) ，高 斌1) ，张 艳2) 1) 北京科技大学冶金生态与工程学院，北京 100083 2) 青岛特殊钢铁有限公司，青岛 266043  通信作者，E-mail: gaobin3747@ 163． com 摘 要 为给高铁低硅烧结矿的生产提供理论依据，设计烧结矿碱度 Ｒ 为 1. 8、1. 9 和 2. 0，每种碱度下以 SiO2 含量为变量， 产生 12 组配矿方案进行烧结杯实验，研究 SiO2 对烧结矿冶金性能及微观结构的影响． 结果表明: SiO2 质量分数从 4. 8% ～ 5. 7% 增加时，其冷态强度逐渐增加，最大增幅为 8% ; 烧结矿还原性逐渐降低，降幅区间为从 86. 80% 到 81. 01% ; 还原粉化指 数 ＲDI + 3. 15逐渐增大，增幅区间为从 75. 95% 到87. 21% ; 对于软熔性能，其软化开始温度 T10在4. 8% ～ 5. 4% 的 SiO2 含量区间 先升高，在 5. 4% ～ 5. 7% 之间又降低，而软化区间有变宽的趋势． 选定一个碱度水平 Ｒ = 2. 0，烧结矿 SiO2 质量分数在 4. 8% ～ 5. 7% 范围变化时，其微观结构由熔蚀状向针柱状发展，结构均匀性逐渐提高，主要矿物组成由赤铁矿向铁酸钙发展，且低 温还原粉化的骸晶状赤铁矿逐渐消失． 关键词 烧结; 二氧化硅; 冶金性能; 微观结构 分类号 TF046 Effects of SiO2 on the metallurgical properties and microstructure of sinter YAN Zhi-wu1) ，ZHANG Jian-liang1) ，ZHANG Ya-peng1) ，CHEN Zi-luo1) ，WANG Yao-zu1) ，GAO Bin1)  ，ZHANG Yan2) 1) School of Metallurgical and Ecological Engineering，University of Science and Technology Beijing，Beijing 100083，China 2) Qingdao Special Steel Co． ，Ltd． ，Qingdao 266043，China  Corresponding author，E-mail: gaobin3747@ 163． com ABSTＲACT In order to provide a theoretical basis for the production of high iron and low silica sinter，the basicity ( Ｒ) was set to 1. 8，1. 9 and 2. 0，the SiO2 content was variable for each alkalinity，and then 12 groups of ore blending schemes were generated to proceed with sinter pot tests． After that，the influences of SiO2 on the metallurgical properties and microstructure of sinter were re￾searched． The results show that when the SiO2 content increases from 4. 8% to 5. 7% ，the cold intensity gradually increases，and the greatest growing rate is 8% ; the sinter reducibility tends to lower，and the decreasing range is from 86. 80% to 81. 01% ; the reduc￾tion degradation index ( ＲDI + 3. 15 ) gradually increases，and the growing range is from 75. 95% to 87. 21% ． For softening-melting properties，the apparent initial softening temperature ( T10 ) previously increases in the range from 4. 8% to 5. 4% and then decreases in the range from 5. 4% to 5. 7% ，and the softening range has a widening trend． Selected a alkalinity level Ｒ = 2. 0，when the SiO2 content changes in the range of 4. 8% to 5. 7% ，the microstructure of sinter develops from an ablation shape to a needle-like and co￾lumnar shape，the structural uniformity gradually improves，and the main mineral composition changes from hematite to calcium fer￾rite． Skeletal crystalline hematite，which leads to a low temperature reduction degradation phenomenon，gradually disappears． KEY WOＲDS ore sintering; silicon dioxide; metallurgical properties; microstructure 收稿日期: 2015--07--24 基金项目: 国家自然科学基金资助项目( 51174023，U1260202) 烧结矿是国内高炉炼铁的主要原料，其质量将直 接影响到高炉炉况和钢铁产量． 目前我国高炉追求高 铁低硅的烧结矿，一般认为高品质烧结矿其 SiO2 含量 应小于 5% ，这样的烧结矿有利于降低高炉渣量，保证