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Title: Enthalpies of formation of polyhalite: A mineral relevant to salt repository

Abstract

Polyhalite is an important coexisting mineral with halite in salt repositories for nuclear waste disposal, such as Waste Isolation Pilot Plant (WIPP) in Carlsbad, New Mexico. The thermal stability of this mineral is a key knowledge in evaluating the integrity of a salt repository in the long term, as water may release due to thermal decomposition of polyhalite. Previous studies on structural evolution of polyhalite at elevated temperatures laid the basis for detailed calorimetric measurements. Using high-temperature oxide-melt drop-solution calorimetry at 975 K with sodium molybdate as the solvent, we have determined the standard enthalpies of formation from constituent sulfates (ΔH° f,sul), oxides (ΔH° f,ox) and elements (ΔH° f,ele) of a polyhalite sample with the composition of K 2Ca 2Mg(SO 4) 4·1.95H 2O from the Salado formation at the WIPP site. The obtained results are: ΔH° f,sul = -152.5 ± 5.3 kJ/mol, ΔH° f,ox = -1926.1 ± 10.5 kJ/mol, and ΔH° f,ele = -6301.2 ± 9.9 kJ/mol. Furthermore, based on the estimated formation entropies of polyhalite, its standard Gibbs free energy of formation has been derived to be in the range of -5715.3 ± 9.9 kJ/mol to -5739.3 ± 9.9 kJ/mol. In conclusion, these determined thermodynamic properties provide fundamental parametersmore » for modeling the stability behavior of polyhalite in salt repositories.« less

Authors:
 [1];  [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Laboratory Directed Research and Development (LDRD) Program
OSTI Identifier:
1364549
Report Number(s):
LA-UR-17-20042
Journal ID: ISSN 0021-9614
Grant/Contract Number:  
AC52-06NA25396; 237546
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Chemical Thermodynamics
Additional Journal Information:
Journal Volume: 114; Journal ID: ISSN 0021-9614
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; 54 ENVIRONMENTAL SCIENCES; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Earth Sciences

Citation Formats

Guo, Xiaofeng, and Xu, Hongwu. Enthalpies of formation of polyhalite: A mineral relevant to salt repository. United States: N. p., 2017. Web. doi:10.1016/j.jct.2017.05.031.
Guo, Xiaofeng, & Xu, Hongwu. Enthalpies of formation of polyhalite: A mineral relevant to salt repository. United States. doi:10.1016/j.jct.2017.05.031.
Guo, Xiaofeng, and Xu, Hongwu. Fri . "Enthalpies of formation of polyhalite: A mineral relevant to salt repository". United States. doi:10.1016/j.jct.2017.05.031. https://www.osti.gov/servlets/purl/1364549.
@article{osti_1364549,
title = {Enthalpies of formation of polyhalite: A mineral relevant to salt repository},
author = {Guo, Xiaofeng and Xu, Hongwu},
abstractNote = {Polyhalite is an important coexisting mineral with halite in salt repositories for nuclear waste disposal, such as Waste Isolation Pilot Plant (WIPP) in Carlsbad, New Mexico. The thermal stability of this mineral is a key knowledge in evaluating the integrity of a salt repository in the long term, as water may release due to thermal decomposition of polyhalite. Previous studies on structural evolution of polyhalite at elevated temperatures laid the basis for detailed calorimetric measurements. Using high-temperature oxide-melt drop-solution calorimetry at 975 K with sodium molybdate as the solvent, we have determined the standard enthalpies of formation from constituent sulfates (ΔH°f,sul), oxides (ΔH°f,ox) and elements (ΔH°f,ele) of a polyhalite sample with the composition of K2Ca2Mg(SO4)4·1.95H2O from the Salado formation at the WIPP site. The obtained results are: ΔH°f,sul = -152.5 ± 5.3 kJ/mol, ΔH°f,ox = -1926.1 ± 10.5 kJ/mol, and ΔH°f,ele = -6301.2 ± 9.9 kJ/mol. Furthermore, based on the estimated formation entropies of polyhalite, its standard Gibbs free energy of formation has been derived to be in the range of -5715.3 ± 9.9 kJ/mol to -5739.3 ± 9.9 kJ/mol. In conclusion, these determined thermodynamic properties provide fundamental parameters for modeling the stability behavior of polyhalite in salt repositories.},
doi = {10.1016/j.jct.2017.05.031},
journal = {Journal of Chemical Thermodynamics},
number = ,
volume = 114,
place = {United States},
year = {Fri Jun 02 00:00:00 EDT 2017},
month = {Fri Jun 02 00:00:00 EDT 2017}
}

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