Preliminary characterization and selection of candidate saponite material

Directorate-General For Research And Innovation

Description

Nuclear energy and safety

Sujets

• Nuclear physics
• Outline of physical science

Informations

• Publié par: DIRECTORATE-GENERAL-FOR-RESEARCH-AND-INNOVATION
• Nombre de lectures: 37
• Langue: Español
• Poids de l'ouvrage: 43 Mo

Extrait

ISSN 1018-5593
European Commission
Field test for the demonstration of the
emplacement feasibility of clay buffer material
as engineered barrier, in crystalline formation
(Volume 2)
Preliminary characterization and selection
)f candidate saponite material European Commission
Field test for the demonstration of the
emplacement feasibility of clay buffer material
as engineered barrier, in crystalline formation
(Volume 2)
Preliminary characterization and selection
of candidate saponite material
J. Astudillo, C. del Olmo
Enresa
Calle Emilio Vargas, 7
E-28043 Madrid
S. Leguey, J. Cuevas, M. Pozo, A. Marín, Ρ. García
Ciemat
Ctra. de Colmenar Viejo, Km 15,5
E-28071 Madrid
Contract No FU W/0231
Final report
Work carried out under contract in the framework of the European Atomic Energy Community,
R&D programme on management and storage of radioactive waste (1985-89)
Part A, Task 4: 'Geological disposal studies'
Directorate-General
Science, Research and Development
1995 EUR 15692/2 ES-EN Published by the
EUROPEAN COMMISSION
Directorate-General XIII
Telecommunications, Information Market and Exploitation of Research
L-2920 Luxembourg
LEGAL NOTICE
Neither the European Commission nor any person acting on behalf of
the Commission is responsible for the use which might be made of the
following information
ISBN 92-826-8349-4 (Volumes 1, 2 and 3)
Cataloguing data can be found at the end of this publication
Luxembourg: Office for Official Publications of the European Communities, 1995
ISBN 92-826-8351-6
© ECSC-EC-EAEC, Brussels · Luxembourg, 1995
Printed in Spain Field Test for the Demonstration of the Emplacement Feasibility... Volume
ABSTRACT
The work performed in the project "Field test for the demonstration of the emplacement
feasibility of clay buffer material as engineered barrier, in crystalline formation" is presented
in three different volumes.
This Volume II describes the characterization and selection of saponite material from the
ore deposit located at the Madrid Terciary Basin.
Three deposits, Villaluenga, Esquivias and Yuncos were considered. The granulometrie,
mineralogicai and chemical analysis were performed at total sample and at the 2 μπι frac­
tion. The methodology is similar to the one described in Volume I. In parallel, the adsortion
properties were analyzed. The saponite from the Villaluenga area was selected. This saponi­
te, named green clay at part of the study, presents a specific surface of 120-200 m2/g and an
exchange capacity of 70-150 meq/g, with magnesium as main cation of exchange.
The preliminary studies of the hydrothermal alterations indicate that there are no changes
due neither to the temperature effects nor to the potassium chlorine solutions on the saponite
stability. Nevertheless, these data will be completed with a more detailed study.
The Villaluenga green clays and the montmorillonites of Cortijo de Archidona are the na­
tural clay materials selected for the field test of the emplacement of the buffer material.
The industrial test was performed by CIEMAT and CEA and is described at Volume III. Field Test for the Demonstration of the Emplacement Feasibility... Volume
RESUMEN
El trabajo llevado a cabo en el proyecto "Ensayos de campo para la demostración de la
factibilidad del emplazamiento de materiales arcillosos de relleno y sellado como barreras
de ingeniería en formaciones cristalinas" se presenta en tres diferentes volúmenes.
Este Volumen II describe la caracterización y selección de saponita de los yacimientos lo­
calizados en la Cuenca Terciaria de Madrid.
Se han tomado en consideración tres de ellos: Villaluenga, Esquivias y Yuncos. Se lleva­
ron a cabo análisis granulométrico, mineralógico y químico de la muestra total y de la frac­
ción de 2 μιτι. La metodología es similar a la descrita en el Volumen I. En paralelo se anali­
zaron las propiedades de adsorción. Fue seleccionada la saponita de Villaluenga. Esta
saponita, llamada arcilla verde en parte del estudio, presenta una supercifie específica de
120­200 m2/g y una capacidad de intercambio de 70­150 meq/g con magnesio como princi­
pal catión de intercambio.
Los estudios preliminares de alteración hidrotermal indican que no hay cambios debidos a
los efectos de la temperatura o a las soluciones de cloruro potásico en la estabilidad de la sa­
ponita. No obstante, estos datos se completarán con un estudio más detallado.
Las arcillas verdes de Villaluenga y la montmorillonita del Cortijo de Archidona son los
materiales arcillosos seleccionados para los ensayos de campo sobre el emplazamiento de s de relleno y sellado.
El ensayo industrial fue llevado a cabo por CIEMAT y CEA y se describe en el Volu­
men III.
V Field Test for the Demonstration of the Emplacement Feasibility... Volume
TABLE OF CONTENTS
A. INTRODUCTION
A.1. Objectives and scientific considerations IX
A.2. Work description
A.3. Project organization X
B. EXECUTIVE SUMMARY
Introduction XIII
B.1. Selection of Spanish clay buffer
B.2. Optimization of Block manufacturing techniques XV
B.3. Alternative techniques X
B.4. Barrier study and manufacturing and necessary resources XV
B.5. Construction and characterization of the disposal holes XVI
B.6. Placement of the canister buffer system XVII
B.7. Conclusions XVIII
C. CARACTERIZACIÓN DE ESMECTITAS MAGNÉSICAS DE LA CUENCA DE MADRID
ENSAYOS DE ALTERACIÓN HIDROTERMAL
CI. Introducción 1
CII. Metodología 33
CIN. Caracterización de esmectitas magnésicas 57
CIV. Ensayos de alteración hidrotermal 9
C.V. Discusión de resultados 149
CVI. Conclusiones 15
C.VII. Bibliografía 16
Vil-