高硅型铁矿对烧结工艺及烧结矿冶金性能的影响  

Effect of high-silicon iron ore on sintered on ore sintering process and metallurgical properties

作　　者：伍英[1] 高立华 WU Ying;GAO Lihua(Ironmaking Plant,Baosteel Co.,Ltd.,Shanghai 201900,China)

机构地区：[1]宝钢股份有限公司炼铁厂,上海201900

出　　处：《钢铁》2024年第2期25-35,共11页Iron and Steel

摘　　要：目前,全球铁矿石价格指数持续上浮,钢铁企业面临全球铁矿石资源劣质化以及钢铁产量需求提高的问题,对钢铁企业的稳定发展造成了巨大的冲击。宝武钢铁为落实高炉炼铁资源战略方针,拓宽矿石资源采购渠道,提高宝武矿石资源采购的话语权,宝钢股份宝山基地烧结工序逐步增加高硅型铁矿粉的使用量。但增加高硅型铁矿粉配比对于烧结矿固结机制以及复合铁酸钙形成机制影响尚不明确,因此以高比例高硅型铁矿烧结试验为基础进行研究。通过微型烧结试验、烧结杯试验和宝钢烧结机工业试验,探明高硅型铁矿对复合铁酸钙生成机理和固结机制以及烧结矿冶金性能的影响。结果表明,高硅型铁矿粉替换比例增加到12%时,同化性温度、液相流动性指数缓慢增加,但是连晶强度下降比较明显,连晶强度从1080.72 N快速降低至745.79 N,主要与硅酸盐相的形成有关。随着反应时间、反应温度增加,SiO2对黏结相生成的不利影响减弱;随着高硅铁矿粉替换图巴朗粉比例增加,铁酸钙含量增加,抑制了硅酸钙和铁橄榄石的生成,改善了液相黏结相的流动性,烧结产率和燃料单耗下降,但亚铁质量分数从8.7%增加到9.1%。综合考虑,最理想的高硅型铁矿粉替换比例应小于12%。研究结果可以为高硅型铁矿粉配矿烧结以及助力“经料方针”提供理论指导和参考依据。At present,the global iron ore price index continues to rise,the issue of low-quality iron ore resources and rising steel production demand that iron and steel companies are currently dealing with had a significant influence to maintain their stable development.The Baoshan sintering base of Baosteel steadily increased the usage of high silicon iron ore powder to achieve the strategy of blast furnace ironmaking resources,extend the procurement channels of ore resources,and strengthen the right to speak of Baowu ore resources procurement.Nevertheless,the effect of increasing the proportion of high-silica iron ore powder on the sintering mechanism and the formation mechanism of compound calcium ferrate(SFCA)is not clear,so based on a high proportion of high-silica iron ore sintering test to research.The effect of high silica-type iron ore on the generation mechanism and solidification mechanism of SFCA as well as the metallurgical performance of sintered ore was researched using the micro sintering experiment,sintering cup test and the Baosteel sintering machine industrial test.The findings demonstrate that when the replacement ratio of high silica-type iron ore powder is raised to 12%,the assimilative temperature and liquid phase fluidity index increase gradually,but the decrease of the crystalline strength is more pronounced and decreases rapidly from 1080.72 N to 745.79 N,which is primarily related to the formation of the silicate phase.The detrimental impact of silica on the formation of the binder phase was lessened with an increase in reaction time and temperature.The mass percent of ferrous iron increases from 8.7%to 9.1%as the proportion of high silica iron ore powder replacing Tubarang powder rises.This is due to an increase in calcium ferrate,which reduces the production of calcium silicate and iron olivine and improves the fluidity of the liquid phase binder phase.Consideration of the ideal high silica iron ore powder replacement ratio should be less than 12%.The results can provide theoretical guidance a

关 键 词：烧结矿 高硅型铁矿 矿相结构 冶金特性 复合铁酸钙 配矿比例 

分 类 号：TF046.4[冶金工程—冶金物理化学]