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| DETERMINATION OF THE ACTIVITY OF LANTHANUM OXIDE IN ESR SLAGS |
| Hong Yanruo;Bai Jiangtian |
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Cite this article:
Hong Yanruo;Bai Jiangtian. DETERMINATION OF THE ACTIVITY OF LANTHANUM OXIDE IN ESR SLAGS. Acta Metall Sin, 1979, 15(1): 51-57.
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Abstract A chemical equilibrium method has been used to determine the activity ofLa_2O_3 in CaF_2-base ESR slags and the effect of CaO, MgO and Al_2O_3 has beenstudied. It is shown that the activity of La_2O_3 (α_(La_2O_3)) increases rapidly with itsconcentration in the binary system La_2O_3-CaF_2 as represented by α_(La_2O_3)=N_(La_2O_3)~(1.59).Expressions of α_(La_2O_3) in slags containing CaO and MgO are: α_(La_2O_3(30%La_2O_3))=0. 0219+0. 0651N_(CaO) α_(La_2O_3(30%La_2O_3,10%CaO))=0. 0331+0. 0365N_(MgO)~(1.4)Thus, either CaO or MgO increases γ_(La_2O_3) and the effect of CaO is more mark-ed owing to its greater basicity. On the other hand, Al_2O_2 was found to lowerγ_(La_2O_3), especially when its content was in excess of 5%. Assuming that interactionbetween CaF_2, CaO and MgO when they coexisted would not alter the individualeffects upon α_(La_2O_3) as shown above, equations of more general applications maybe put forward for approximate calculations of α_(La_2O_3) in such ESR slags.
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Received: 18 January 1979
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[1] 北京钢丝厂,北京钢铁学院物理化学教研室,稀土渣的性质及在电热合金中的应用,1978年2月.
[2] 王常珍,邹元燨,液态La_2O_3-CaF_2和La_2O_3-CaF_2-CaO-SiO_2渣中La_2O_3的活度, 1964年10月. |
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