研究Zn在含Cl的FetO-CaO-SiO2-Al2O3渣系中的挥发行为,包括挥发气体种类、挥发率以及各因子如温度、渣成分、添加剂等的影响.应用吉布斯自由能最小化原则,热力学计算显示在本实验温度条件下,样品90%渣+10%ZnO+CaCl2中的挥发气体为金属Zn、ZnCl2及FeCl2.实验结果表明,金属Zn及FeCl2气体挥发量随温度增加而增加,而ZnCl2气体量却随之降低.反应初期,样品挥发速度很快,10 min后基本趋于稳定,ZnCl2主要形成于样品升温期间(室温至实验温度1 190 ℃),恒温期间,生成的ZnCl2与FeO反应生成FeCl2气体及ZnO,后者又被FeO还原成金属Zn气体.渣成分中,FeO含量和二元碱度CaO/SiO2对Zn的挥发气体种类及挥发率有重要影响.添加还原剂如C粉可显著提高Zn的挥发率.
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