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Title: Method of determining glass durability

Abstract

A process is described 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. 4 figs.

Inventors:
; ; ;
Issue Date:
Research Org.:
Westinghouse Savannah River Co
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
321172
Patent Number(s):
5,846,278
Application Number:
PAN: 8-684,553
Assignee:
Westinghouse Savannah River Co., Aiken, SC (United States) PTO; SCA: 360604; PA: EDB-99:030727; SN: 99002058507
DOE Contract Number:  
AC09-89SR18035
Resource Type:
Patent
Resource Relation:
Other Information: PBD: 8 Dec 1998
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; GLASS; CORROSION RESISTANCE; DISSOLUTION; LEACHATES; FREE ENERGY; REGRESSION ANALYSIS; PROCESS CONTROL; SYNTHESIS; PHASE STUDIES

Citation Formats

Jantzen, C.M., Pickett, J.B., Brown, K.G., and Edwards, T.B. Method of determining glass durability. United States: N. p., 1998. Web.
Jantzen, C.M., Pickett, J.B., Brown, K.G., & Edwards, T.B. Method of determining glass durability. United States.
Jantzen, C.M., Pickett, J.B., Brown, K.G., and Edwards, T.B. Tue . "Method of determining glass durability". United States.
@article{osti_321172,
title = {Method of determining glass durability},
author = {Jantzen, C.M. and Pickett, J.B. and Brown, K.G. and Edwards, T.B.},
abstractNote = {A process is described 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. 4 figs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1998},
month = {12}
}