Effect of CaO/SiO2 Mass Ratio on the Precipitation Behavior of Spinel Phase in Stainless Steel Slag
作者单位：Key Laboratory for Ecological Metallurgy of Multimetallic Mineral (Ministry of Education)Northeastern University
会议名称：《“第十届中国钢铁年会”暨“第六届宝钢学术年会”》
会议日期：2015年
学科分类：080602[工学-钢铁冶金] 08[工学] 0806[工学-冶金工程]
关 键 词：stainless steel slag spinel phase thermodynamic leaching basicity
摘 要：In the present work, synthetic samples of CaO-SiO-MgO-AlO-FeO-CrO slagwere obtained to analyze the effect of CaO/SiO mass ratioon the precipitation of spinel *** samples were heated to 1600°C for melting completely,and then slowly cooled to 1300°C for holding 30 min beforequenching in water. The phases composition and precipitation behavior of spinel phasewere analyzed by X-ray powder diffraction(XRD) and scanning electron microscope-energydispersive spectroscopy(SEM-EDS). The law of conservation of mass and linear least square equation were used to calculate the mineral phase proportion in stainless steel slag. The leaching test was conducted for pointing out the chromium stability in different CaO /SiO ratio slags. The results showed that Cr was mainly enriched in spinel phase and liquid phase. Slag composition with CaO/SiO=1.5 was beneficial to improve theprecipitation of spinel phase and reduce the chromium leaching *** CaO /SiO ratioshould be avoided, which could lead to the formation of leachable chromium containing periclase phase and high chromium leaching. The average grain size of spinel phase was found to increase with decreasing CaO/SiO ratio.