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Experimental Studies of the Alkali Behaviour in Blast Furnace Type Slags
Author(s) -
Ivanov Olexiy,
Savov Luben,
Janke Dieter
Publication year - 2004
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.1002/srin.200405794
Subject(s) - alkali metal , slag (welding) , evaporation , blast furnace , metallurgy , kinetics , oxide , chemistry , work (physics) , materials science , thermodynamics , inorganic chemistry , mineralogy , organic chemistry , physics , quantum mechanics
In a preceding paper, existing data on the chemical behaviour of alkali compounds and their influence on physical properties of BF slags as well as on materials circulation in the BF operations were critically reviewed. In the present work, new investigations based on fundamental experiments and thermochemical modelling are introduced. They have been focused on the determination of both chemical activity of Na 2 O and kinetics of Na 2 O and K 2 O evaporation from BF‐type slags. The results for the activities a Na 2 O agree fairly well with data obtained from calculation based on the slag model of H. Gaye which seems generally suitable to predict chemical activities in molten slags. Kinetics of alkali evaporation from BF‐type slags follow a first‐order reaction. The rate constants for K 2 O are remarkably higher than those for Na 2 O. Alkali evaporation is enhanced with decreased %(CaO)/%(SiO 2 ) ratio and lower Al 2 O 3 content and is increased with temperature. It is further favoured under reducing conditions in the absence of iron oxide in the slag.