LF炉精炼废渣渣相组成及形成机理研究

Phase compositions and formation mechanism of spent slag in ladle furnace

用ICP电感耦合等离子体质谱仪、X射线衍射仪、光学显微镜、扫描电镜、能谱分析仪和电子探针等微观研究手段以及热力学方法对LF炉精炼废渣化学成分、物相组成、形貌、类型和尺寸以及有害物质S的存在形式进行观察和分析。结果表明,LF炉精炼废渣具有自由CaO含量大、碱度高和氧化性高的特点,其物相组成为钙铝和硅钙系复杂物相,脱硫产物CaS在废渣中与钙铝系复杂物相作用,以铝酸钙硫化物的形式稳定存在。

With ICP, XRD, SEM/EDS, optical microscope and thermodynamics analysis, this paper analyzes the chemical constituents, phase compositions, phase appearance and distribution of spent slag in the ladle furnace, especially the phase of sulphur. It is concluded that the spent slag in the ladle furnace slag has the characteristics of high basicity and high oxidizability, and the amount of CaO in the slag is large; the primary phase compositions of the slag is calcium aluminum and silicon calcium compounds; and the desulfurizing production of the slag forms calcium aluminate sulphide which exists in the slag steadily.