Geopolymerization of low-grade bauxite
Radmilović, Velimir R.
MetadataShow full item record
In terms of quality, bauxite ore can be classified as high- or low-grade ore. High-grade bauxite ores are used for alumina extraction using the Bayer process, while low-grade bauxite ores have a limited application. In this paper we investigate the possibility of evaluating low-grade bauxite ores with the geopolymerization process. The influence of the synthesis parameters, i.e., alkali and silicate dosages and alkali cations (Na+ and K+) on the compressive strength of bauxite-based geopolymers is evaluated. The results show that an increase in the alkali dosage has a beneficial effect on the strength of bauxite-based geopolymers, while the strengthening of geopolymers by increasing the silicate dosage is limited by the viscosity of the geopolymer paste. Moreover, Na-geopolymers reach higher values of the compressive strength than K-geopolymers.
Keywords:geopolymerization / low-grade bauxite / alkali-cation geopolymerization degree / compressive strength
Source:Materiali in Tehnologije, 2014, 48, 1, 39-44
- Institute of Metals and Technology
Funding / projects:
- Ministry of Science of Montenegro [01-460]
- U.S. Department of EnergyUnited States Department of Energy (DOE) [DE-AC02-05CH11231]
- info:eu-repo/grantAgreement/MESTD/Basic Research (BR or ON)/172054/RS// (RS-172054)