Tetsu-to-Hagane
Online ISSN : 1883-2954
Print ISSN : 0021-1575
ON ACTIVITIES OF COEXISTING ELEMENTS IN MOLTEN IRON (III)
The Activity of Manganese in Molten Fe-Mn alloy
Koji SanbongiMasayasu Ohtani
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1954 Volume 40 Issue 12 Pages 1106-1109

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Abstract

By constructing the following electrode concentration cell and by a potentiometer, authors measured the electromotive force corresponding to the change in the manganese content in iron:
+, Fe-Mn|SiO2-MnO-CaO-MgO|Mn-
The temperature of the experiment was about 1, 590±5°C and for the measurement of temperature, a Pt-Pt/Rh thermocouple was used. The theoretical relation between the electromotive force E (V) and the activity of manganese, aMn was as follows:
(1)
where aiMn=the activity of manganese ion in the molten slag
a'Mn=the activity of pure manganese
when pure manganese was selected so as to be in a standard state, the following equation was obtained from eq. (1):
(2)
n was approximately determined as n=2 by a calculation from the authors' data. From eq.
(2) the activities of manganese were determined for all over the range.
From the authors' result, Fe-Mn binary solution was recongnized to be approximately an ideal solution in all over the range.
Judging from considerations made from several points of view, Fe-Ni and Fe-Co binary solution were also considered to follow the Raoults' law as in the case of Fe-Mn binary solution.

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© The Iron and Steel Institute of Japan
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