Back to Search
Start Over
Potential of hazardous waste encapsulation in concrete with coal fly ash and bivalve shells.
- Source :
-
Journal of Cleaner Production . Jun2018, Vol. 185, p870-881. 12p. - Publication Year :
- 2018
-
Abstract
- Coal fly ash (FA) is abundant in countries that use steam coal for power production. The resultant FA is Class F FA (<20% CaO, Al 2 O 3 + SiO 2 > 70%, <6% Loss on Ignition) and can be used as an excellent scrubber and fixation reagent for acidic wastes containing toxic trace elements. In Spain, less than 50% of the abundant FA is currently being used. This paper reports on the potential use of Class F FA as a neutralization and fixation reagent for the hazardous sludge waste of the phosphate industry. Several analytical techniques (ICP-MS, ICP-AES, SEM-EDX, and XRD), and leaching experiments (EN12457-2) were used for this study. The results identify the best FA/waste ratios for full neutralization and fixation. Furthermore, adding a high calcium carbonate material prevents the excessive leaching of As, Mo, and Se, and facilitates full neutralization and fixation. Furthermore, the use of a safe aggregate (produced by mixing coal phosphate waste with fly ash and/or bivalve shells) as a partial substitute for sand improves the quality of concrete for civil engineering projects and is environmentally safe. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09596526
- Volume :
- 185
- Database :
- Academic Search Index
- Journal :
- Journal of Cleaner Production
- Publication Type :
- Academic Journal
- Accession number :
- 128742421
- Full Text :
- https://doi.org/10.1016/j.jclepro.2018.03.079