((1. 北京科技大學 冶金與生態(tài)工程學院，北京100083；2. 東北大學 多元物質(zhì)科學研究所，仙臺 980-8577，日本))
摘 要: 研究Zn在含Cl的FetO-CaO-SiO2-Al2O3渣系中的揮發(fā)行為，包括揮發(fā)氣體種類、揮發(fā)率以及各因子如溫度、渣成分、添加劑等的影響。應(yīng)用吉布斯自由能最小化原則，熱力學計算顯示在本實驗溫度條件下，樣品90%渣+10%ZnO+CaCl2中的揮發(fā)氣體為金屬Zn、ZnCl2及FeCl2。實驗結(jié)果表明，金屬Zn及FeCl2氣體揮發(fā)量隨溫度增加而增加，而ZnCl2氣體量卻隨之降低。反應(yīng)初期，樣品揮發(fā)速度很快，10 min后基本趨于穩(wěn)定，ZnCl2主要形成于樣品升溫期間(室溫至實驗溫度1 190 ℃)，恒溫期間，生成的ZnCl2與FeO反應(yīng)生成FeCl2氣體及ZnO，后者又被FeO還原成金屬Zn氣體。渣成分中，FeO含量和二元堿度CaO/SiO2對Zn的揮發(fā)氣體種類及揮發(fā)率有重要影響。添加還原劑如C粉可顯著提高Zn的揮發(fā)率。
關(guān)鍵字: FetO-CaO-SiO2-Al2O3渣系；Zn；揮發(fā)行為
（(1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China; 2. Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan)）
Abstract:Vaporization behavior of zinc in the slag system FetO-CaO-SiO2-Al2O3 was examined, including the formation ratio of vapor species and their partitioning as well as the effect of process factors such as temperature, holding time, slag composition, and addition of reductive agents. A thermodynamic estimation with the principle of Gibbs free energy minimization shows that the major vapor species from the sample of FeO-CaO-SiO2-Al2O3 system+ZnO+CaCl2 are metallic Zn, ZnCl2 and FeCl2 in the experimental temperature range. The results suggest that the formation ratio of metallic Zn and FeCl2 increases with temperature increasing , while that of ZnCl2 decreases. The evaporation of sample is initially fast and becomes steady after holding for 10 min. Gaseous ZnCl2 is mainly formed during heating period, at the holding stage it reacts with FeO to produce gaseous FeCl2. With regard to slag compositions, FeO and basicity significantly affect the evaporation of zinc. The evaporation ratio of zinc can be enhanced by the addition of reductants such as carbon powder.
Key words: FetO-CaO-SiO2-Al2O3 slag system; zinc; vaporization behaviors
