Title: In-situ investigation on the reduction of magnesiochromite with ferrosilicon between 1 373-1 573 K
Authors: Wang, Xuan ×
Van Gerven, Tom
Blanpain, Bart
Guo, Muxing #
Issue Date: 2015
Publisher: The Institute
Series Title: ISIJ International vol:55 issue:11 pages:2289-2296
Abstract: Certain amount of the chromium in slags exists in the form of magnesiochromite (MgCr2O4) during the decarbonisation of stainless refining. It is mainly recovered through high temperature reduction. In this study, an interface of ferrosilicon and synthetic MgCr2O4 is made and the reduction behaviour is in-situ observed by confocal scanning laser microscope (CSLM) between 1 373–1 573 K. The samples were analysed afterwards through electron probe micro analyser (EPMA). Reduction of MgCr2O4 can already initiate at 1 373 K within around 30 min. The heat generated from the reaction between Si and Cr2O3 can increase the local temperature of the area surrounding the reaction zone. This makes the liquefaction of Fe–Si alloy possible even at measured bulk temperatures lower than its melting point. Although Fe does not participate in the reduction of Cr, it can diffuse into the reaction zone to form a Fe–Cr–Si alloy phase, together
with the reduced Cr metal and residual Si. The liquid Fe–Cr–Si alloy can act as a transfer medium for Si to promote the reduction.
ISSN: 0915-1559
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Department of Materials Engineering - miscellaneous
Process Engineering for Sustainable Systems Section
Structural Composites and Alloys, Integrity and Nondestructive Testing
Sustainable Metals Processing and Recycling
× corresponding author
# (joint) last author

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