(北京科技大學 冶金與生態(tài)工程學院 鋼鐵冶金新技術國家重點實驗室，北京 100083)
摘 要: 為研究精煉渣中Ce2O3的加入對渣中Al2O3活度的影響，根據爐渣結構離子與分子共存理論和相關相圖，建立1 500 ℃下Ce2O3-Al2O3和CaO-Al2O3-Ce2O3渣系作用濃度的計算模型，考察Ce2O3對Al2O3作用濃度的影響。結果表明：對于Ce2O3-Al2O3渣系，當Ce2O3的摩爾分數在0.49左右時，Ce2O3·Al2O3的作用濃度達到最大值0.90，使得Al2O3和Ce2O3的作用濃度均達到較低水平；對于CaO-Al2O3-Ce2O3渣系，模型所計算的Al2O3作用濃度與實測Al2O3活度的變化趨勢一致，即Ce2O3含量一定時，隨著w(CaO)/w(Al2O3)的增加，Al2O3的作用濃度降低；保持w(CaO)/w(Al2O3)不變，隨著Ce2O3含量的增加，Al2O3的作用濃度降低。同時，由計算結果繪出CaO和Ce2O3的等作用濃度線。總之，精煉渣中添加一定量的Ce2O3能夠有效地降低Al2O3的作用濃度，這能提高精煉過程中高質量潔凈鋼中Al2O3的去除速率和精煉渣的精煉效率。
關鍵字: Ce2O3-Al2O3；CaO-Al2O3-Ce2O3；共存理論；作用濃度；活度；計算模型
（State Key Laboratory of Advanced Metallurgy, School of Metallurgical and Ecological Engineering,
University of Science and Technology Beijing, Beijing 100083, China）
Abstract:In order to investigate the effect of addition of Ce2O3 to refining slag on the activity of Al2O3, thermodynamic model for the evaluation of mass action concentrations for Ce2O3-Al2O3 and CaO-Al2O3-Ce2O3 slag systems was formulated at 1 500 ℃ according to the ion and molecule coexistence theory (IMCT) for molten slags and corresponding phase diagrams, and the effect of Ce2O3 on the action concentration of Al2O3 was investigated. The results show that, for Ce2O3-Al2O3 slag system, when the mole fraction of Ce2O3 is 0.49, the mass action concentration (Ni) of Ce2O3？Al2O3 achieves its maximum value 0.90, and both the mass action concentrations of Ce2O3 and Al2O3 maintain at very low levels. For CaO-Al2O3-Ce2O3 slag system, the change trends of calculated are in good agreement with reported measured trends of ，which are that decreases with the increase of w(CaO)/w(Al2O3) at a certain content of Ce2O3 and with the increase of Ce2O3 content at a certain value of w(CaO)/w(Al2O3)。Moreover, the iso-curves and are also drawn from the calculated results. Above all, adding certain content of Ce2O3 to refining slag can effectively reduce , which can improve the Al2O3 inclusions removal efficiency of high grade clean steel and refining efficiency of refining slag.
Key words: Ce2O3-Al2O3; CaO-Al2O3-Ce2O3; coexistence theory; action concentration; activity; calculating model
