工程科学学报2016，Vol.38Issue(7)：913-919,7.DOI:10.13374/j.issn2095-9389.2016.07.004
SiO2对烧结矿冶金性能及微观结构的影响
Effects of SiO2 on the metallurgical properties and microstructure of sinter
摘要
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.关键词
烧结/二氧化硅/冶金性能/微观结构Key words
ore sintering/silicon dioxide/metallurgical properties/microstructure分类
矿业与冶金引用本文复制引用
闫志武,张建良,张亚鹏,陈子罗,王耀祖,高斌,张艳..SiO2对烧结矿冶金性能及微观结构的影响[J].工程科学学报,2016,38(7):913-919,7.基金项目
国家自然科学基金资助项目(51174023, U1260202) （51174023, U1260202）
