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Method of determining glass durability

Patent ·
OSTI ID:872020
 [1];  [1];  [2];  [1]
  1. Aiken, SC
  2. Augusta, GA
+ Show Author Affiliations
A process for determining one or more leachate concentrations of one or more components of a glass composition in an aqueous solution of the glass composition by identifying the components of the glass composition, including associated oxides, determining a preliminary glass dissolution estimator, .DELTA.G.sub.p, based upon the free energies of hydration for the component reactant species, determining an accelerated glass dissolution function, .DELTA.G.sub.a, based upon the free energy associated with weak acid dissociation, .DELTA.G.sub.a.sup.WA, and accelerated matrix dissolution at high pH, .DELTA.G.sub.a.sup.SB associated with solution strong base formation, and determining a final hydration free energy, .DELTA.G.sub.f. This final hydration free energy is then used to determine leachate concentrations for elements of interest using a regression analysis and the formula log.sub.10 (N C.sub.i (g/L))=a.sub.i +b.sub.i .DELTA.G.sub.f. The present invention also includes a method to determine whether a particular glass to be produced will be homogeneous or phase separated. The present invention is also directed to methods of monitoring and controlling processes for making glass using these determinations to modify the feedstock materials until a desired glass durability and homogeneity is obtained.
Research Organization:
WESTINGHOUSE SAVANNAH RIVER CO
DOE Contract Number:
AC09-89SR18035
Assignee:
Westinghouse Savannah River Company (Aiken, SC)
Patent Number(s):
US 5846278
OSTI ID:
872020
Country of Publication:
United States
Language:
English

References (8)

Chemical Durability of Glass book January 1982
Chemical durability of glasses; a thermodynamic approach journal November 1977
Prediction of Radioactive Waste Glass Durability by the Hydration Thermodynamic Model: Application to Saturated Repository Environments journal January 1989
Prediction of Glass Durability as a Function of Environmental Conditions journal January 1988
Pourbaix Diagram for The Prediction of Waste Glass Durability in Geologic Environments journal January 1987
Thermodynamic model of natural, medieval and nuclear waste glass durability journal September 1984
Nuclear Waste Glass Durability: I, Predicting Environmental Response from Thermodynamic (Pourbaix) Diagrams journal September 1992
Errors of DWPF Frit analysis report January 1992

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Related Subjects

/65/588/
10
accelerated
acid
analysis
aqueous
aqueous solution
associated
base
base form
based
component
components
composition
concentrations
controlling
delta
desired
determinations
determine
determining
directed
dissociation
dissolution
durability
elements
energies
energy
estimator
feedstock
feedstock materials
final
formation
formula
free
free energy
function
glass
glass composition
homogeneity
homogeneous
hydration
identifying
including
leachate
log
materials
matrix
method
methods
modify
monitoring
obtained
oxides
particular
particular glass
ph
phase
phase separate
phase separated
preliminary
process
processes
produced
reactant
reactant species
regression
rolling process
sb
separated
solution
species
strong
strong base
weak
weak acid