期刊
JOURNAL OF SUSTAINABLE METALLURGY
卷 2, 期 4, 页码 394-404出版社
SPRINGER
DOI: 10.1007/s40831-016-0080-6
关键词
Bauxite residue; Inorganic polymer; Geopolymers; Valorization; Zero-waste
资金
- European Community [636876]
- Marie Curie Actions (MSCA) [636876] Funding Source: Marie Curie Actions (MSCA)
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 A degrees 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 A degrees 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.
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