This work investigates the stabilizing impact of MnO on the leaching behavior of hazardous Cr‐containing CaO‐SiO₂‐Al₂O₃‐Cr₂O₃‐MnO stainless steel slags after equilibrating at various elevated temperatures and evaluates the potential immobilization of Cr into a MnCr₂O₄ spinel phase from the existing Cr₂O₃ phase. The MnCr₂O₄ spinel phase was found to be an excellent Cr‐stabilizer in stainless steel slags, where the leaching tendency of potentially hazardous Cr‐related ions decreased with higher MnO content and lower equilibration temperatures within the range of 0 to 15 mass pct. and 1500 to 1300°C, respectively. Thermodynamic calculations by conducting the phase stability diagram also showed that the MnCr₂O₄ spinel phase was relatively stable and the Ca₃Si₂O₇ (Ca_3‐xMn_xSi₂O₇) phase was relatively unstable compared with other crystal phases in acid extractant with pH value of 3.2. Combined with the scanning electron microscopy and X‐ray powder diffraction results along with the thermodynamic calculations, the leached Cr‐related ions was predominantly originating from the unstable amorphous glass phase.

中文翻译：

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加入MnO将铬固定在不锈钢渣中

这项工作研究了MnO对在各种高温下平衡后的炉渣中含Cr的危险含Cr的CaO-SiO ₂ -Al ₂ O ₃ -Cr ₂ O ₃ -MnO的浸出行为的稳定影响，并评估了Cr固定化的可能性。从现有的Cr ₂ O ₃相得到MnCr ₂ O ₄尖晶石相。MnCr ₂ O ₄尖晶石相被发现是不锈钢炉渣中极好的Cr稳定剂，其中随着MnO含量的增加和在0至15质量百分比范围内的平衡温度降低，潜在的与Cr相关的有害离子的浸出趋势降低。和1500至1300°C。通过进行相稳定性图进行的热力学计算还表明，MnCr ₂ O ₄尖晶石相相对稳定，Ca ₃ Si ₂ O ₇（Ca _3–x Mn _x Si ₂ O ₇相较于pH值为3.2的酸萃取剂中的其他晶体相而言，）相相对不稳定。结合扫描电子显微镜和X射线粉末衍射结果以及热力学计算，浸出的Cr相关离子主要来自不稳定的非晶态玻璃相。