中国有色金属学报
中國有色金屬學報
중국유색금속학보
THE CHINESE JOURNAL OF NONFERROUS METALS
2013年
10期
2999-3005
,共7页
Ce2O3-Al2O3%CaO-Al2O3-Ce2O3%共存理论%作用浓度%活度%计算模型
Ce2O3-Al2O3%CaO-Al2O3-Ce2O3%共存理論%作用濃度%活度%計算模型
Ce2O3-Al2O3%CaO-Al2O3-Ce2O3%공존이론%작용농도%활도%계산모형
Ce2O3-Al2O3%CaO-Al2O3-Ce2O3%coexistence theory%action concentration%activity%calculating model
为研究精炼渣中Ce2O3的加入对渣中Al2O3活度的影响，根据炉渣结构离子与分子共存理论和相关相图，建立1500℃下Ce2O3-Al2O3和CaO-Al2O3-Ce2O3渣系作用浓度的计算模型，考察Ce2O3对Al2O3作用浓度的影响。结果表明：对于Ce2O3-Al2O3渣系，当Ce2O3的摩尔分数在0.49左右时，Ce2O3·Al2O3的作用浓度达到最大值0.90，使得Al2O3和Ce2O3的作用浓度均达到较低水平；对于CaO-Al2O3-Ce2O3渣系，模型所计算的Al2O3作用浓度与实测Al2O3活度的变化趋势一致，即Ce2O3含量一定时，随着w(CaO)/w(Al2O3)的增加，Al2O3的作用浓度降低；保持w(CaO)/w(Al2O3)不变，随着Ce2O3含量的增加，Al2O3的作用浓度降低。同时，由计算结果绘出CaO和Ce2O3的等作用浓度线。总之，精炼渣中添加一定量的Ce2O3能够有效地降低Al2O3的作用浓度，这能提高精炼过程中高质量洁净钢中Al2O3的去除速率和精炼渣的精炼效率。
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1500℃下Ce2O3-Al2O3和CaO-Al2O3-Ce2O3渣繫作用濃度的計算模型，攷察Ce2O3對Al2O3作用濃度的影響。結果錶明：對于Ce2O3-Al2O3渣繫，噹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渣繫，模型所計算的Al2O3作用濃度與實測Al2O3活度的變化趨勢一緻，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，由計算結果繪齣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淨鋼中Al2O3的去除速率和精煉渣的精煉效率。
위연구정련사중Ce2O3적가입대사중Al2O3활도적영향，근거로사결구리자여분자공존이론화상관상도，건립1500℃하Ce2O3-Al2O3화CaO-Al2O3-Ce2O3사계작용농도적계산모형，고찰Ce2O3대Al2O3작용농도적영향。결과표명：대우Ce2O3-Al2O3사계，당Ce2O3적마이분수재0.49좌우시，Ce2O3·Al2O3적작용농도체도최대치0.90，사득Al2O3화Ce2O3적작용농도균체도교저수평；대우CaO-Al2O3-Ce2O3사계，모형소계산적Al2O3작용농도여실측Al2O3활도적변화추세일치，즉Ce2O3함량일정시，수착w(CaO)/w(Al2O3)적증가，Al2O3적작용농도강저；보지w(CaO)/w(Al2O3)불변，수착Ce2O3함량적증가，Al2O3적작용농도강저。동시，유계산결과회출CaO화Ce2O3적등작용농도선。총지，정련사중첨가일정량적Ce2O3능구유효지강저Al2O3적작용농도，저능제고정련과정중고질량길정강중Al2O3적거제속솔화정련사적정련효솔。
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 Al2O3N are in good agreement with reported measured trends of Al2O3a ,which are that Al2O3N 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 Ce2O3N and CaON are also drawn from the calculated results. Above all, adding certain content of Ce2O3 to refining slag can effectively reduce Al2O3N , which can improve the Al2O3 inclusions removal efficiency of high grade clean steel and refining efficiency of refining slag.
