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Mineralogy of Refractory Brick (50% Al 2 O 3 ) Made from Negev Clays
Author(s) -
Mishirky S. A.,
Siniansky W.I.
Publication year - 1971
Publication title -
israel journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.908
H-Index - 54
eISSN - 1869-5868
pISSN - 0021-2148
DOI - 10.1002/ijch.197100068
Subject(s) - brick , cristobalite , grinding , mineralogy , grain size , mullite , chemistry , refractory (planetary science) , metallurgy , analytical chemistry (journal) , composite material , materials science , quartz , ceramic , chromatography
The mineralogy of refractory bricks (50% Al 2 O 3 ) made under varying conditions of temperature, pressure and grain size was investigated. Maximum temperature attained was 1450°C, pressure was varied between hand pressing and 1000 kg/cm 2 , grain size ranged from < 0.088 mm to 6 mm and was obtained by varying duration of the grinding process. The bricks produced were subjected to chemical and X‐ray diffraction studies, measurement of physical properties, and optical studies in thin sections. It is concluded that optimum conditions for manufacture of refractory brick are high temperature and pressure. Grain size itself is crucial, but the grinding process is far more efficient if the two starting clay materials are ground together rather than separately. It was concluded that TiO 2 served as a mineralizer, and it favors well developed mullite crystal. Cristobalite was not detected at all by optical methods, while it was detected clearly by X‐ray diffraction.