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The Influence of Zeolite (Sokyrnytsya Deposit) on the Physical and Chemical Resistance of a Magnesium Potassium Phosphate Compound for the Immobilization of High-Level Waste

The manuscript presents the results of the development of new material for high-level waste (HLW) management: the magnesium potassium phosphate (MKP) compound. The possibility of using zeolite (Sokyrnytsya deposit) to increase the mechanical, thermal, and hydrolytic resistance of this compound with...

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Autores principales: Kulikova, Svetlana A., Vinokurov, Sergey E.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6804266/
https://www.ncbi.nlm.nih.gov/pubmed/31547080
http://dx.doi.org/10.3390/molecules24193421
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author Kulikova, Svetlana A.
Vinokurov, Sergey E.
author_facet Kulikova, Svetlana A.
Vinokurov, Sergey E.
author_sort Kulikova, Svetlana A.
collection PubMed
description The manuscript presents the results of the development of new material for high-level waste (HLW) management: the magnesium potassium phosphate (MKP) compound. The possibility of using zeolite (Sokyrnytsya deposit) to increase the mechanical, thermal, and hydrolytic resistance of this compound with immobilized HLW was studied. The main component of the used natural zeolite is a mineral of the clinoptilolite–heulandite series, and quartz, microcline, and clay minerals (illite, sepiolite, and smectite) are present as impurities. The compressive strength of the compound, containing at least 4.2 wt % zeolite, is about 25 MPa. Compound containing 28.6 wt % zeolite retains high compressive strength (at least 9.0 MPa), even after heat treatment at 450 °C. The adding of zeolite to the composition of the compound increases its hydrolytic stability, while the leaching rate of the mobile nuclides (137)Cs and (90)Sr decreases up to one order of values. Differential leaching rate of radionuclides from the compound containing 28.6 wt % zeolite is 2.6 × 10(−7) for (137)Cs, 2.9 × 10(−6) for (90)Sr, 1.7 × 10(−9) for (239)Pu, and 2.9 × 10(−9) g/(cm(2)∙day) for (241)Am. Thus, the properties of the resulting compound correspond to the requirements for solidified HLW in Russia.
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spelling pubmed-68042662019-11-18 The Influence of Zeolite (Sokyrnytsya Deposit) on the Physical and Chemical Resistance of a Magnesium Potassium Phosphate Compound for the Immobilization of High-Level Waste Kulikova, Svetlana A. Vinokurov, Sergey E. Molecules Article The manuscript presents the results of the development of new material for high-level waste (HLW) management: the magnesium potassium phosphate (MKP) compound. The possibility of using zeolite (Sokyrnytsya deposit) to increase the mechanical, thermal, and hydrolytic resistance of this compound with immobilized HLW was studied. The main component of the used natural zeolite is a mineral of the clinoptilolite–heulandite series, and quartz, microcline, and clay minerals (illite, sepiolite, and smectite) are present as impurities. The compressive strength of the compound, containing at least 4.2 wt % zeolite, is about 25 MPa. Compound containing 28.6 wt % zeolite retains high compressive strength (at least 9.0 MPa), even after heat treatment at 450 °C. The adding of zeolite to the composition of the compound increases its hydrolytic stability, while the leaching rate of the mobile nuclides (137)Cs and (90)Sr decreases up to one order of values. Differential leaching rate of radionuclides from the compound containing 28.6 wt % zeolite is 2.6 × 10(−7) for (137)Cs, 2.9 × 10(−6) for (90)Sr, 1.7 × 10(−9) for (239)Pu, and 2.9 × 10(−9) g/(cm(2)∙day) for (241)Am. Thus, the properties of the resulting compound correspond to the requirements for solidified HLW in Russia. MDPI 2019-09-20 /pmc/articles/PMC6804266/ /pubmed/31547080 http://dx.doi.org/10.3390/molecules24193421 Text en © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Kulikova, Svetlana A.
Vinokurov, Sergey E.
The Influence of Zeolite (Sokyrnytsya Deposit) on the Physical and Chemical Resistance of a Magnesium Potassium Phosphate Compound for the Immobilization of High-Level Waste
title The Influence of Zeolite (Sokyrnytsya Deposit) on the Physical and Chemical Resistance of a Magnesium Potassium Phosphate Compound for the Immobilization of High-Level Waste
title_full The Influence of Zeolite (Sokyrnytsya Deposit) on the Physical and Chemical Resistance of a Magnesium Potassium Phosphate Compound for the Immobilization of High-Level Waste
title_fullStr The Influence of Zeolite (Sokyrnytsya Deposit) on the Physical and Chemical Resistance of a Magnesium Potassium Phosphate Compound for the Immobilization of High-Level Waste
title_full_unstemmed The Influence of Zeolite (Sokyrnytsya Deposit) on the Physical and Chemical Resistance of a Magnesium Potassium Phosphate Compound for the Immobilization of High-Level Waste
title_short The Influence of Zeolite (Sokyrnytsya Deposit) on the Physical and Chemical Resistance of a Magnesium Potassium Phosphate Compound for the Immobilization of High-Level Waste
title_sort influence of zeolite (sokyrnytsya deposit) on the physical and chemical resistance of a magnesium potassium phosphate compound for the immobilization of high-level waste
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6804266/
https://www.ncbi.nlm.nih.gov/pubmed/31547080
http://dx.doi.org/10.3390/molecules24193421
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