Co-solidification of bauxite residue and coal ash into indurated monolith via ambient geopolymerisation for in situ environmental application.
AAM
Alkali-activated material
Fly ash
Inorganic polymer
Red mud
Journal
Journal of hazardous materials
ISSN: 1873-3336
Titre abrégé: J Hazard Mater
Pays: Netherlands
ID NLM: 9422688
Informations de publication
Date de publication:
15 Jan 2022
15 Jan 2022
Historique:
received:
30
03
2021
revised:
21
07
2021
accepted:
14
08
2021
pubmed:
28
8
2021
medline:
28
8
2021
entrez:
27
8
2021
Statut:
ppublish
Résumé
Bauxite residues generated from alumina refineries worldwide have accumulated to more than 4 billion tons, at an annual increment of ~ 0.15 billion tons. It is imperative and urgent for the alumina sector to develop field-operable disposal solutions for rapid and cost-effective stabilisation of alkaline bauxite residues (BR) in the storage facility to minimise/prevent potential environmental risks. Taking advantage of the availability of coal ash (CA) on site, we studied a feasible way to synthesise geopolymer from active (amorphous) aluminosilicate components of BR and CA via the alkaline hydrolysis under ambient conditions. The new geopolymeric binder effectively solidifies BR-CA mixtures into indurated monoliths whose unconstrained compressive strength (UCS) can reach as high as ~ 20 MPa after 8 weeks. The Full Factorial Experimental Design was used to study relative influences of BR:CA ratio, modulus of activating solution, and H
Identifiants
pubmed: 34449336
pii: S0304-3894(21)01893-8
doi: 10.1016/j.jhazmat.2021.126925
pii:
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
126925Informations de copyright
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