(1. 中南大學(xué) 冶金科學(xué)與工程學(xué)院，長沙 410083；
2. 江西理工大學(xué) 材料與化學(xué)工程學(xué)院，贛州 341000；
3. 中國瑞林工程技術(shù)有限公司，南昌 330002)
摘 要: 基于爐渣結(jié)構(gòu)共存理論，建立1 200~1 300 ℃下CaO-Cu2O-Fe2O3三元渣系組元活度的計算模型，計算并繪制渣中CaO、Cu2O和Fe2O3的等活度曲線，考察堿度B和溫度t對組元活度α(CaO)、α(Cu2O)和α(Fe2O3)的影響。結(jié)果表明：模型計算值α(Cu2O)與文獻實測值α′(Cu2O)吻合程度高，說明模型能較好地反映該渣系的結(jié)構(gòu)本質(zhì)；α(Cu2O)呈拉烏爾正偏差，在B=1.54時出現(xiàn)最大值，當(dāng)B＞1.54時隨著B和t的增大而降低，當(dāng)B＜1.54時趨勢正好相反，且受堿度影響更為顯著；α(CaO)和α(Fe2O3)分別隨CaO和Fe2O3在爐渣中含量的升高而增大，但受溫度的影響都不明顯。研究結(jié)果可用于采用鐵酸鈣渣系的煉銅新工藝熱力學(xué)研究。
關(guān)鍵字: 鐵酸鈣渣；共存理論；活度；計算模型
（1. School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China;
2. Faculty of Material and Chemistry Engineering, Jiangxi University of Science and Technology,
Ganzhou 341000, China;
3. China Nerin Engineering Co., Ltd., Nanchang 330002, China）
Abstract: According to the coexistence theory of slag structure, the activity calculation model for slag system of CaO-Cu2O-Fe2O3 was built from 1 200 ℃ to 1 300 ℃. Then, the activities of CaO, Cu2O and Fe2O3 in the slag were calculated, and their equal activity curves were drawn. The influence of basicity B and temperature t on the activities α(Cu2O), α(CaO) and α(Fe2O3) was also analyzed. The results show that the calculated α(Cu2O) is in good agreement with the reported measured α′(Cu2O), showing that the model can wholly embody the slag structural characteristics. α(Cu2O) departures positively from Raoult values and reaches the maximum value when B is 1.54, then decreases with the increase of B and t when B＞1.54, but increases when B＜1.54. α(CaO) and α(Fe2O3) increase with the increasing contents of CaO and Fe2O3 in slag, but change little with change of temperature. The results can be applied to the thermodynamic research of new copper smelting technologies adopting calcium ferrite slag.
Key words: calcium ferrite slag; coexistence theory; activity; calculation model
