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Air‐Cooling of Metallurgical Slags Containing Multivalent Oxides
Author(s) -
Durinck Dirk,
Jones Peter Tom,
Blanpain Bart,
Wollants Patrick
Publication year - 2008
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.1551-2916.2008.02597.x
Subject(s) - slag (welding) , partial pressure , metallurgy , oxygen , diffusion , materials science , pyrometallurgy , oxide , basic oxygen steelmaking , atmosphere (unit) , atmospheric pressure , air cooling , steelmaking , chemistry , thermodynamics , smelting , geology , physics , oceanography , organic chemistry
During air‐cooling, high temperature, reduced metallurgical slags are brought in contact with ambient air, resulting in a gradient in both temperature and oxygen partial pressure. In this article, the p O 2 dependency of slags containing multivalent oxides is investigated. Computer simulations with an extended version of the Scheil solidification model indicate significant differences in both end mineralogy and solidification path depending on oxygen partial pressure and oxygen diffusion. It is shown that metallic particles can form inside the slag during cooling because of a lack of oxygen exchange with the surrounding atmosphere. This is confirmed by laboratory solidification experiments, which corroborate that the level of oxygen diffusion is indeed limited. The proposed solidification mechanisms are extrapolated to industrial practice, based on key features of a stainless‐steel electric arc furnace slag. The possible implications for slag recycling are discussed.