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Slag corrosion of dolomite‐carbon refractories
Author(s) -
Le Coq Xavier,
Dupré Bernard,
Gleitzer Charles,
Adam Robert,
Scheidt François,
Tassot Patrick
Publication year - 1990
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.199000411
Subject(s) - graphite , periclase , metallurgy , materials science , corrosion , electron microprobe , dolomite , lime , slag (welding) , carbon fibers , magnesium , composite material , composite number
Seven industrial doloma refractory samples, coming from three European suppliers, and with different carbon, or graphite, or binder content, are subjected to the action of a slag required for the desulfurization of the steel in the secondary metallurgy at 1600°C. Three tests have been carried out within two induction furnaces. The corrosion depth, at the slag‐steel interface, has been measured; the graphite‐containing samples display a better resistance than the graphite‐free pitch or resin‐bonded refractories. Among the graphite‐containing samples correlations have been found with the carbon content and with the resistance to oxidation by CO–CO 2 at 1100–1200°C. The slag‐refractory interface has been investigated by X‐ray diffraction, optical microscopy and electron microprobe analysis; the observed phases are CaO, MgO, Ca 2 SiO 4 , Ca 3 SiO 5 and Ca 12 Al 14 O 33 (outside graphite and iron). The corrosion mechanism is linked to the reaction of slag with lime, followed by infiltration of the refractory and dispersion of periclase grains in the slag.