Effect of MnO on Mineral Composition of CaO-SiO2-MgO-Al2O3-Cr2O3 System
Effect of MnO on Mineral Composition of CaO-SiO2-MgO-Al2O3-Cr2O3 System
复制标题
MnO对CaO-SiO2-MgO-Al2O3-Cr2O3系矿物成分的影响
DOI：
10.4236/jmmce.2017.53011
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
Z. Xue
中科院分区：
文献类型：
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作者：
Yue Yu;Jianli Li;Mengxiong Li;Z. Xue
不锈钢渣中铬的浸出很大程度上取决于铬的赋存状态。通过CaO-SiO2-MgO-Al2O3-Cr2O3合成渣研究了MnO对不锈钢渣矿物成分的影响。实验在导电炉中进行，测试期间收集的样品使用 X 射线衍射 (XRD) 和配备能量色散光谱 (EDS) 的扫描电子显微镜 (SEM) 进行分析。结果表明，MnO的加入显着降低了氧化物体系的固相线温度，从1204℃降低到950℃，促进了尖晶石的析出，增大了尖晶石晶体的尺寸。随着MnO含量的增加，非尖晶石矿物相中铬的含量减少，尖晶石相中溶解的拉菱石量略有减少。此外，当MnO含量达到6wt%时，会形成非晶相。因此，MnO的添加有利于抑制铬从炉渣中的浸出。
The chromium leaching from stainless steel slag highly depends on the occurrence of chromium. The effect of MnO on the mineral composition of stainless steel slag was investigated through CaO-SiO2-MgO-Al2O3-Cr2O3 synthetic slags. The experiments were performed in a conductive furnace, and the samples collected during tests were analyzed using X-ray Diffrac-tion (XRD) and Scanning Electron Microscope (SEM) equipped Energy Dispersive Spectroscopy (EDS). The results show that the addition of MnO significantly reduces the solidus temperature of oxide systems from 1204oC to 950oC, promotes the spinel precipitation and increases the size of spinel crystals. The fraction of chromium contained in non-spinel mineral phases decreases and the amount of larnite dissolved into spinel phase slightly reduces with the content of MnO increasing. In addition, the amorphous phase forms when the content of MnO is up to 6 wt%. Hence, the addition of MnO is beneficial to suppress chromium leaching from slag.