Solidification/stabilization of technetium in cement-based grouts

Conference · Sun Dec 31 23:00:00 EST 1989

OSTI ID:5328833

Gilliam, T M; Bostick, W D; Spence, R D; Shoemaker, J L ^[1]

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1. Oak Ridge National Lab., TN (USA)

Mixed low-level radioactive and chemically hazardous process treatment wastes from the Portsmouth Gaseous Diffusion Plant are stabilized by solidification in cement-based grouts. Conventional portland cement and fly ash grouts have been shown to be effective for retention of hydrolyzable metals (e.g., lead, cadmium, uranium and nickel) but are marginally acceptable for retention of radioactive Tc-99, which is present in the waste as the highly mobile pertechnate anion. Addition of ground blast furnace slag to the grout is shown to reduce the leachability of technetium by several orders of magnitude. The selective effect of slag is believed to be due to its ability to reduce Tc(VII) to the less soluble Tc(IV) species. 12 refs., 4 tabs.

• Research Organization: Oak Ridge National Lab., TN (USA)
• Sponsoring Organization: DOE/DP
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 5328833
• Report Number(s): CONF-900256-1; ON: DE90003681
• Country of Publication: United States
• Language: English

Related Subjects

052002* -- Nuclear Fuels-- Waste Disposal & Storage
053000 -- Nuclear Fuels-- Environmental Aspects
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS
12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
AEROSOL WASTES
ASHES
BUILDING MATERIALS
CEMENTS
DISSOLUTION
EVALUATION
FLY ASH
GROUND DISPOSAL
GROUTING
HAZARDOUS MATERIALS
LEACHING
LIQUID WASTES
LOW-LEVEL RADIOACTIVE WASTES
MANAGEMENT
MATERIALS
PHASE TRANSFORMATIONS
PORTLAND CEMENT
RADIOACTIVE MATERIALS
RADIOACTIVE WASTE MANAGEMENT
RADIOACTIVE WASTES
RESIDUES
SEPARATION PROCESSES
SOLIDIFICATION
WASTE DISPOSAL
WASTE FORMS
WASTE MANAGEMENT
WASTES