Slag-based saltstone formulations

Conference · Sat Aug 01 04:00:00 EDT 1987

OSTI ID:6163518

Langton, C A

Approximately 400 x 10/sup 6/ L of low-level alkaline salt solution will be treated at the Savannah River Plant (SRP) Defense Waste Processing Facility (DWPF) prior to disposal in concrete vaults at SRP. Treatment involves removal of Cs/sup +/ and Sr/sup +2/, followed by solidification and stabilization of potential contaminants in saltstone, a hydrated ceramic wasteform. Chromium, technetium, and nitrate releases from saltstone can be significantly reduced by substituting hydraulic blast furnace slag for portland cement in the formulation designs. Slag-based mixes are also compatible with the Class F flyash used in saltstone as a functional extender to control heat of hydration and reduce permeability. (Class F flyash is also locally available at SRP.) A monolithic wasteform is produced by the hydration of the slag and flyash. Soluble ion release (NO/sup 3 -/) is controlled by the saltstone microstructure. Chromium and technetium are less leachable from slag mixes because these species are chemically reduced to a lower valence state by ferrous iron in the slag and are precipitated as relatively insoluble phases, such as Cr(OH)/sub 3/ and TcO/sub 2/. 3 refs., 3 figs., 2 tabs.

• Research Organization: Savannah River Lab., Aiken, SC (USA)
• DOE Contract Number: AC09-76SR00001
• OSTI ID: 6163518
• Report Number(s): DP-MS-87-95; CONF-870859-10; ON: DE87014435
• Country of Publication: United States
• Language: English

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54 ENVIRONMENTAL SCIENCES
AEROSOL WASTES
ALKALI METALS
ALKALINE EARTH METALS
ASHES
CESIUM
CHROMIUM
DISSOLUTION
ELEMENTS
FLY ASH
HYDRATION
LEACHING
LIQUID WASTES
LOW-LEVEL RADIOACTIVE WASTES
MANAGEMENT
MATERIALS
METALS
NATIONAL ORGANIZATIONS
NITRATES
NITROGEN COMPOUNDS
OXYGEN COMPOUNDS
PH VALUE
PHASE TRANSFORMATIONS
PROCESSING
RADIOACTIVE MATERIALS
RADIOACTIVE WASTE PROCESSING
RADIOACTIVE WASTES
REMOVAL
RESIDUES
SAVANNAH RIVER PLANT
SEPARATION PROCESSES
SLAGS
SOLIDIFICATION
SOLVATION
STABILITY
STRONTIUM
TECHNETIUM
TRANSITION ELEMENTS
UNDERGROUND DISPOSAL
US AEC
US DOE
US ERDA
US ORGANIZATIONS
WASTE DISPOSAL
WASTE MANAGEMENT
WASTE PROCESSING
WASTE PRODUCT UTILIZATION
WASTES