影响鞍钢转炉渣安定性的矿物相研究

来源期刊：钢铁2010年第6期

论文作者：王向锋 张新义 于淑娟 侯洪宇 杨大正 王再义

文章页码：98 - 101

关键词：钢渣； 矿物相； 安定性

Key words：steelmaking slag； mineral phase； stability

摘    要：由于鞍钢转炉钢渣存在体积安定性不良等问题,严重制约了钢渣的再利用途径和范围。采用扫描电子显微镜的X射线能谱仪等手段观察了鞍钢转炉渣的矿物形貌,测定了矿物的元素成分,并对不同时期转炉渣中f-CaO与f-MgO的含量进行化学分析,以明确f-CaO、RO相和f-MgO等对钢渣安定性的影响规律。结果表明:1)鞍钢转炉钢渣中主要矿物相为C₂S、铁铝钙、镁铁相固溶体和少量C₃S、f-CaO与f-MgO;2)鞍钢转炉渣中RO相的主要组织为镁铁相,质量分数为10%~20%,MgO/FeO的典型比例约为1∶2;3)鞍钢转炉渣f-CaO质量分数为2.08%~7.79%,f-MgO质量分数为0.16%~0.41%;4)微观形貌和化学分析结果均证明鞍钢转炉钢渣安定性的主要影响因素为f-CaO含量;5)游离氧化镁的单相组织极少,对转炉渣的安定性影响主要取决于RO相。

Abstract: The reusing channels and scope of converter slag have been seriously limited because of its bad performance of volume stability.In order to confirm the influence rule of free-CaO,RO phase and free-MgO on the stability of converter slag in Ansteel,the microstructure of converter slag samples from Ansteel were observed by the scanning electron microscope with X-ray energy dispersive spectrometer,and the element composition of micro-regions in the mineral phase were determined,then the contents of free-CaO and free-MgO of converter slag were determined by chemical analysis.The results show,1) the main phases in the slag are C₂S,Fe₂O₃-Al₂O₃-CaO and MgO-FeO solid solution,and the minor minerals are C₃S,free-CaO and free-MgO;2) the main organization of RO phase are found for the MgO-FeO solid solution in Anteel converter slag,which contents are 10%-20%,and the representative proportion of MgO/FeO approximately is 1∶2;3) the f-CaO content of Ansteel converter slag is 2.08%-7.79%,and the f-MgO content is 0.16%-0.41%;4) the microscopic images and the chemical analysis results prove that the major effect factor of steel slag stability is the content of f-CaO;5) free-magnesia single-phase organization are very few,the stability of converter slag mainly depends on the RO phase.