Fixation of trace elements by ettringite: A screening study. Final topical report, December 31, 1989-September 30, 1990
Long-term leaching studies on mixtures of coal combustion ash have shown that the formation of an ettringite structure phase was accompanied by reductions of solution concentrations of potentially hazardous elements such as arsenic, boron, and selenium. The possibility that oxyanionic forms of elements including arsenate, borate, chromate, molybdate, selenate, and vanadate form ettringite has been explored. There are literature reports of fully substituted borate, chromate, and selenate ettringites and reports of two minerals with partial substitution of borate for sulfate. Samples of substituted ettringites containing arsenic, boron, chromium, selenium, and vanadium have been synthesized. The study focused on borate and selenate ettringites. The success of the study suggests that the formation of these naturally occurring and synthetic minerals may provide a means to stabilize potentially hazardous oxyanions at contaminated sites and stabilize materials with the potential to accumulate and leach concentrations of hazardous elements.
- Research Organization:
- North Dakota Univ., Grand Forks, ND (United States). Energy and Environmental Research Center
- OSTI ID:
- 5218329
- Report Number(s):
- PB-92-180546/XAB; CNN: GRI-5089-253-1829
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
010900 -- Coal
Lignite
& Peat-- Environmental Aspects
54 ENVIRONMENTAL SCIENCES
540250* -- Environment
Terrestrial-- Site Resource & Use Studies-- (1990-)
AEROSOL WASTES
ANIONS
ARSENIC
ASHES
BORATES
BORON
BORON COMPOUNDS
BUILDING MATERIALS
CARBONACEOUS MATERIALS
CEMENTING
CEMENTS
CHARGED PARTICLES
CHROMIUM
COAL
COMBUSTION PRODUCTS
DISSOLUTION
ELEMENTS
ENERGY SOURCES
FLY ASH
FOSSIL FUELS
FUELS
HAZARDOUS MATERIALS
IONS
LAND POLLUTION ABATEMENT
LAND RECLAMATION
LEACHING
MATERIALS
METALS
MINERALS
MOLECULAR STRUCTURE
MOLYBDENUM
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
POLLUTION ABATEMENT
RESIDUES
SELENATES
SELENIUM
SELENIUM COMPOUNDS
SEMIMETALS
SEPARATION PROCESSES
SOLIDIFICATION
SOLUBILITY
STABILIZATION
TRANSITION ELEMENTS
VANADIUM
WASTES