Acta Metall Sin  1988, Vol. 24 Issue (4): 299-304    DOI:

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ACTIVITIES OF CaO AND La_2O_3 IN LIQUID CaO-SiO_2-La_2O_3 SLAGS AND SLAG STRUCTURE

WU Jianzhong;WANG Changzhen Northeast University of Technology; ShenyangProfessor;Dept.Non-ferrous Metallurgy;Northeast University of Technology; Shenyang

WU Jianzhong;WANG Changzhen Northeast University of Technology; ShenyangProfessor;Dept.Non-ferrous Metallurgy;Northeast University of Technology; Shenyang. ACTIVITIES OF CaO AND La_2O_3 IN LIQUID CaO-SiO_2-La_2O_3 SLAGS AND SLAG STRUCTURE. Acta Metall Sin, 1988, 24(4): 299-304.

Abstract References Related Articles Recommended Metrics Download:  PDF(451KB)  Export:  BibTeX | EndNote (RIS)       Abstract  The activity of CaO and La_2O_3 in the liquid ternary slag CaO-SiO-La_2O_3 has been determined by equilibrating Sn with the slag phase in a graphitecrucible under 1 atm of CO at 1600℃. The experimental results showed that theactivity of CaO and La_2O_3 changes slowly while the ratio of mole fraction, x_(CaO)/x_(SiO_2), is less than unit, but varies sharply while the ratio increases from 1 to 1.2.In addition, by equilibrating Sn with the binary slag B_2O_3-La_2O_3 saturated with solidLa_2O_3 at three different temperatures, the relation between lg γ°_(La) and 1/T isdetermined as follows: lg γ°_(La)=-29400/T+11.37(1500-1600℃) A random network model of molten silicate structure was applied to CaO-SiO-La_2O_3. It was found that the experimentally determined activity-composition curvesof CaO are qualitatively reproduced by the curves calculated with the model, butthe curves of La_2O_3 are considerably different from the calculated ones. It impliesthat the model used is over-simplified and that the difference in interaction energybetween the metal cations of different valence and silicate anions should be consid-ered. Key words:  ternary system of CaQ-SiO-La_2O_3      slag      slag structure      activity      Received:  18 April 1988      Service E-mail this article Add to citation manager E-mail Alert RSS （） Articles by authors URL:  https://www.ams.org.cn/EN/     OR     https://www.ams.org.cn/EN/Y1988/V24/I4/299 1 张庆登,周祖惠.稀士,1982;(3) :34 2 王渭源,邹元爔.金属学报,1963;6:40 3 王常珍,邹元爔.金属学报,1980;16:190 4 王常珍,叶树青,于丁羽,郭文全.金属学报,1984;20:A357 5 Levin E M, Robbins CBR, McMurdie H F. 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