Behavior of secondary alumina during heating

The losses of weight and F-containing compounds by secondary alumina at various temperatures which can be reached in a bunker of automated feeding by alumina (AFA)—i.e., to 80, 100, 200, 300, and 400°C-are evaluated. The fluorine content in alumina after being held at a specified temperature was det...

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Bibliographic Details
Published in:Russian journal of non-ferrous metals 2010-12, Vol.51 (6), p.447-450
Main Authors: Vasyunina, N. V., Vasyunina, I. P., Mikhalev, Yu. G., Vinogradov, A. M.
Format: Article
Language:English
Subjects:
Aluminum oxide
Bunkers
Chemistry and Materials Science
Desorption
Feeding
Fluorine
Heating
Materials Science
Metallic Materials
Metallurgy of Nonferrous Metals
Moisture
Nonferrous metals
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Summary:The losses of weight and F-containing compounds by secondary alumina at various temperatures which can be reached in a bunker of automated feeding by alumina (AFA)—i.e., to 80, 100, 200, 300, and 400°C-are evaluated. The fluorine content in alumina after being held at a specified temperature was determined by the photocolorimetric method. Upon the heating of secondary alumina, noticeable losses of weight and fluorine were observed in it starting from t > 80°C, which is associated with the removal of the latter with physically adsorbed moisture. However, the larger part of fluorine remains in secondary alumina even at t = 400°C, because it consists of solid fluorides and chemisorbed particles. The desorption of fluorine from alumina even at relatively low temperatures (starting from 80°C) means that constructive and technological measures are necessary to decrease them in AFA bunkers.
ISSN:1067-8212
1934-970X
DOI:10.3103/S1067821210060039