钢渣尾渣对烧结成矿的影响机制  

Influence mechanism of steel slag tailings on sintering mineralization

作　　者：张露 周仙霖[1,2] 罗艳红 万军营[1,2] 李柳英 陈铁军 蒋佳颖 余正雄[1,2] ZHANG Lu;ZHOU Xianlin;LUO Yanhong;WAN Junying;LI Liuying;CHEN Tiejun;JIANG Jiaying;YU Zhengxiong(School of Resources and Environmental Engineering,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China;Hubei Key Laboratory for Efficient Utilization and Agglomeration of Metallurgic Mineral Resources,Wuhan 430081,Hubei,China)

机构地区：[1]武汉科技大学资源与环境工程学院,湖北武汉430081 [2]冶金矿产资源高效利用与造块湖北省重点实验室,湖北武汉430081

出　　处：《钢铁》2025年第3期178-186,共9页Iron and Steel

基　　金：广西科技重大专项资助项目(桂科AA24263047);中国宝武低碳冶金创新基金资助项目(BWLCF202107);中冶长天科研开发基础研究基金资助项目(2023JCYJ05)。

摘　　要：钢渣尾渣是炼钢过程中产生的主要固废,随着钢铁产量的增加,钢渣尾渣的堆存量逐年递增,对环境造成巨大影响。钢渣尾渣中CaO等碱性氧化物含量较高,最重要的一个利用方式是将其代替部分烧结熔剂返回烧结,但并不能确定钢渣尾渣是否参与烧结成矿,钢渣尾渣对烧结成矿的影响机制不明。因此,借助高温烧结基础特性试验方法研究利用钢渣尾渣与Ca(OH)2试剂调节碱度对烧结高温基础特性的影响,并进行烧结杯试验,验证钢渣尾渣配入烧结中是否参与烧结成矿反应。通过X射线衍射和金相显微镜对烧结矿进行了工艺矿物学分析,揭示了钢渣尾渣参与成矿的相关机理。结果表明,配加钢渣尾渣的烧结原料,同化性温度降低,液相流动性指数增大,其主要因素是钢渣尾渣含有SiO_(2),其含量增加时,橄榄石类的低熔点化合物相应增加,会促进硅酸盐低熔点体系的形成,从而液相量增加,黏结相强度增强,同时钢渣尾渣中的Al_(2)O_(3)会促使复合铁酸钙生成,有利于得到最优质的黏结相,铁酸钙生成量明显增多;以钢渣尾渣为熔剂时,在碱度为1.82时,烧结矿的转鼓强度达到65.5%,成品率达到82.8%,烧结矿显微结构中赤铁矿和磁铁矿多为斑状结构,铁酸钙多为针状;硅酸二钙多为柳叶状,铁酸钙与磁铁矿呈交织熔蚀嵌布结构,这说明在烧结中配入钢渣尾渣,能够促进烧结成矿反应。Steel slag tailings are the main solid waste produced in the steelmaking process.With the increase of steel production,the stock of steel slag tailings is increasing year by year,which has a great impact on the environment.The content of basic oxides such as CaO in steel slag tailings is high.One of the most important ways to use it is to replace part of the sintering flux to return to sintering,but it cannot be determined whether the steel slag tailings participate in sintering and mineralization.The influence mechanism of steel slag tailings on sintering and mineralization is unknown.Therefore,with the help of the basic characteristics test method of high temperature sintering,the influence of using steel slag tailings and Ca(OH)_(2) reagent to adjust the basicity on the basic characteristics of high temperature sintering was studied,and the sintering cup experiment to verify whether the steel slag tailings were involved in the sintering reaction was carried out.The process mineralogy analysis of sinter was carried out by X-ray diffraction and metallographic microscope,and the related mechanism of steel slag tailings participating in mineralization was revealed.The results show that the assimilation temperature of the sintering raw material with steel slag tailings decreases and the liquid phase fluidity index increases.The main factor is that the steel slag tailings contain SiO_(2).When the content of SiO_(2) increases,the low melting point compounds of olivineincrease correspondingly,which will promote the formation of silicate low melting point system,so as to increase the amount of liquid phase and enhance the strength of the bonding phase.At the same time,the Al_(2)O_(3) in the steel slag tailings will promote the formation of composite calcium ferrite,which is conducive to obtaining the best bonding phase,and the amount of calcium ferrite increases significantly.When steel slag tailings are used as flux,under the condition of basicity 1.82,the drum strength of sinter reaches 65.5%,and the yield reaches 82

关 键 词：钢渣尾渣 同化性 液相流动性 黏结相强度 铁酸钙生成量 矿相结构 烧结性能 固结机制 

分 类 号：TQ1[化学工程]