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Title: 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:
Savannah River Site (SRS), Aiken, SC (United States)
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)

Nuclear Waste Glass Durability: I, Predicting Environmental Response from Thermodynamic (Pourbaix) Diagrams journal September 1992
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
Errors of DWPF Frit analysis report January 1992
Prediction of Radioactive Waste Glass Durability by the Hydration Thermodynamic Model: Application to Saturated Repository Environments journal January 1989
Chemical Durability of Glass book January 1982
Prediction of Glass Durability as a Function of Environmental Conditions journal January 1988
Chemical durability of glasses; a thermodynamic approach journal November 1977

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Related Subjects

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