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A study of the dissolution of Al 2 O 3 , MgO and MgAl 2 O 4 particles in a CaO‐Al 2 O 3 ‐SiO 2 slag
Author(s) -
Valdez Martin,
Prapakorn Kritsada,
W.Cramb Alan,
Seetharaman Sridhar
Publication year - 2001
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.200100120
Subject(s) - dissolution , particle (ecology) , scanning electron microscope , analytical chemistry (journal) , materials science , thermocouple , particle size , atmospheric temperature range , mineralogy , slag (welding) , metallurgy , chemistry , composite material , thermodynamics , chromatography , oceanography , physics , geology
The dissolution behaviour of alumina, MgO and MgAl 2 O 4 particles in a 36%CaO‐21%Al 2 O 3‐ 42%SiO 2 (mass contents in %) slag has been studied using a confocal scanning laser microscope in the temperature range of 1470 ‐ 1550 °C. The double hot thermocouple technique and metallographic examination was also used to characterize the reaction product between the particles and the slag. The total dissolution times for MgO and MgAl 2 O 4 particles decreased with increased temperature and were almost identical (approximately 200 s for a 150 μm diameter particle at 1500 °C.). This phenomenon can be explained by the formation of MgAl 2 O 4 layer on the surface of the MgO particle during dissolution. Alumina dissolution times were slightly longer (approximately 250 s for a 150 μm diameter particle at 1500 °C) than that of MgO and MgAl 2 O 4 particles and no reaction layer was observed on the surface of the particles.