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A PETROGRAPHIC STUDY OF SOME SLAGS FROM BOILER FURNACES 1
Author(s) -
McDowell Samuel J.,
Lee H. C.
Publication year - 1928
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.1151-2916.1928.tb18511.x
Subject(s) - mullite , hematite , corundum , materials science , metallurgy , magnetite , slag (welding) , oxide , petrography , crystallization , mineralogy , spall , refractory (planetary science) , geology , chemistry , ceramic , organic chemistry
Observations are based on a microscopic study of the effect of slags, particularly those of an Illinois coal, on refractories. A mineralogical relation is shown between the slag and the refractory used. The principal phases present in a cooled slag are: (1) a plagioclase feldspar, (2) magnetite or hematite, (3) mullite with iron oxide in solid solution, (4) glass. The so‐called “interface” between slag and refractory is largely crystalline upon cooling and consists principally of mullite which, surrounded by the slag, has grown from fine needles in the refractory to larger ones. In high alumina refractories where diaspor is present, the stained interface is much thicker and grains of corundum are formed. This zone of crystallization may be conducive to spalling. The effect of slags on various refractories is discussed.