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建立了不锈钢渣的CaO-MgO-FeO-SiO2-Al2O3-Cr2O3六元渣系活度模型。基于共存理论的活度模型得出了渣系中主要组分及复合氧化物在不同条件下的活度。结果表明,原渣系中的Cr2O3主要形成了不稳定的CaCr2O4,在自然环境中可以被氧化为酸溶性的CaCrO4,从而释放出强毒性的Cr6+,因此不锈钢渣具有潜在毒性。温度、碱度以及渣中MgO、FeO都对Cr2O3进入尖晶石相中从而实现稳定解毒有影响。通过调节渣系成分和处理条件能够基本实现含铬废渣的无公害化。
The activity model of CaO-MgO-FeO-SiO2-Al2O3-Cr2O3 hexagonal slag system for stainless steel slag was established. The activity model based on the coexistence theory obtained the activity of the main components and composite oxides in the slag system under different conditions. The results show that Cr2O3 in the raw slag system mainly forms unstable CaCr2O4, which can be oxidized to acid-soluble CaCrO4 in the natural environment, thereby releasing highly toxic Cr6 +. Therefore, the stainless steel slag is potentially toxic. Temperature, alkalinity, as well as slag MgO, FeO are on the Cr2O3 into the spinel phase in order to achieve stable detoxification. By adjusting the slag system components and processing conditions can basically achieve the pollution-free chromium slag.