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THE SERIES IRON OXIDES‐SILICA *
Author(s) -
Crook Welton J.
Publication year - 1939
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1939.tb19474.x
Subject(s) - fayalite , wüstite , magnetite , tridymite , oxide , ferrous , iron oxide , metal , oxide minerals , maghemite , cristobalite , chemistry , slag (welding) , eutectic system , mineral , inorganic chemistry , metallurgy , materials science , mineralogy , olivine , quartz , chemical reaction , alloy , biochemistry
A bstract A review is presented of the previous work by the writer on the general series FeO‐Fe 2 O s ‐SiO 2 ‐CaO (MgO) as related to steelmaking slags, in which 12 quasi‐quaternary mineral systems are formed. A “plane of partition” of the iron oxides (FeO and Fe 2 O 3 ) is also shown to exist. A method is explained by which, having a partial analysis of a slag, the position of the slag in the representative tetrahedron may be found and the series of minerals formed may be determined. The present paper is a study of the system iron oxides‐silica under conditions of formation with and without the presence of metallic iron. In the former case, two distinct eutectiferous series are formed, viz. , ( a ) wustite‐fayalite and ( b ) fayalite‐tridy‐mite. The reducing power of metallic iron is so great that substantially the same proportions of FeO and Fe 2 O 3 are obtained when melting is conducted either under strongly oxidizing conditions or in a neutral atmosphere. A “eutectoid” between magnetite and tridymite contains equal molecular proportions of SiO 2 and Fe 3 O 4 . When iron oxide and silica are heated at 1600°C or higher in siliceous crucibles, the resulting melts consist essentially of tridymite and magnetite, forming an entirely different series than that obtained by melting in the presence of metallic iron. In connection with both series of melts, ferric oxide exhibits a much greater affinity for ferrous oxide than for silica.