Partition of Manganese between α-Fe2O3 Crystal and Na2O-B2O3 Melts

A study has been made of the partition of Mn between α-Fe2O3 crystal and sodium borate fluxes at the temperatures ranging from 800 to 1100°C as a function of flux compositions. The total Mn content in α-Fe2O3 is linearly related to that in flux in the studied concentration range. The temperature dep...

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Bibliographic Details
Published inISIJ International Vol. 30; no. 6; pp. 426 - 434
Main Authors Park, Bong-Hoon, Suito, Hideaki
Format Journal Article
LanguageEnglish
Published The Iron and Steel Institute of Japan 01.01.1990
Subjects
manganese
Ostwald ripening
partition
purification of iron oxide powder
redox
sodium borate
α-Fe2O3
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Summary:A study has been made of the partition of Mn between α-Fe2O3 crystal and sodium borate fluxes at the temperatures ranging from 800 to 1100°C as a function of flux compositions. The total Mn content in α-Fe2O3 is linearly related to that in flux in the studied concentration range. The temperature dependence of the partition coefficient kT, Mn=(wt%Mn)solid/(wt%Mn)liquid was found to be positive. It was found that Mn is present as Mn3+ in α-Fe2O3 crystal and Fe and Mn in flux are present as Fe3+ and Mn2+, respectively. On the basis of the mutual interaction of the Mn3+/Mn2+ and Fe3+/Fe2+ redox pairs: Fe3+(s)+Mn2+(l)=Mn3+(s)+Fe2+(l), the partition between solid and liquid phases with a different valency state has been discussed.
ISSN:0915-1559
1347-5460
DOI:10.2355/isijinternational.30.426