Title: A proposal for a 100 % use of bauxite residue towards inorganic polymer mortar
Authors: Hertel, Tobias ×
Blanpain, Bart
Pontikes, Yiannis #
Issue Date: Dec-2016
Publisher: Springer
Series Title: Journal of Sustainable Metallurgy
Article number: DOI 10.1007/s40831-016-0080-6 online
Abstract: A new process is suggested in the present work turning bauxite residue (BR) into a ready-made mortar for the synthesis of inorganic polymers, effectively transforming the Bayer process into a zero-waste process. This was achieved by firing BR at 1100 C which supports the formation of liquid phase and results after subsequent fast cooling in a semivitreous material. Based on thermodynamic calculations, the process was subsequently improved by adding minor quantities of C and silica to BR before firing which leads to the carbothermic reduction of ferric iron into ferrous iron; the new blends demonstrated an increase in the melt formation and eventually in the content of amorphous phase after solidification. The resulting material was activated using a K-silicate solution and was cured at 60 C for 72 h. The synthesized materials were water insoluble and dense, demonstrating compressive strength exceeding 40 MPa for the silica-rich blend. These inorganic polymers can find applications in construction, such as pavement tiles or floor/roofing tiles. A possible implementation of the process to transform BR within the alumina refinery is also represented.
ISSN: 2199-3823
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Sustainable Metals Processing and Recycling
Department of Materials Engineering - miscellaneous
× corresponding author
# (joint) last author

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