, 1.2. Effluents issus de l'accident de Fukushima -Daiichi
, 174 1.2.1. Procédés utilisables pour le traitement d'effluents chimiques, Procédés de traitement des effluents chimiques contaminés en strontium
, Le conditionnement du strontium dans les matériaux cimentaires
, Intérêt des ciments brushitiques pour le traitement et le conditionnement des déchets contaminés
,
, 2.2. Solides avec un taux de substitution en strontium faible à modéré
, , p.187
,
, Rappels sur les différents types d'isothermes de
, Influence du calcium et du sodium sur la rétention du strontium
, Comparaison avec d'autres sorbants utilisés dans la littérature
, Chapitre 5 : Les Wo-CB pour la sorption et le conditionnement du strontium RÉFÉRENCES
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, Une étude des processus conduisant à la prise et a u durcissement d'un ci ment commercial est d'a bord menée. L'i nfluence de la composition de la s olution de gâ chage sur l es réactions mises en jeu est ensuite précisée. Enfi n, une première évaluation du potentiel de ce matériau pour l a décontamination ou l'immobilisation d'effluents aqueux conta mi nés en s tronti um es t réa l i s ée. Les pâ tes de ciment brushitique à base de wollastonite s ont préparées à partir de wollastonite broyée et d'une solution d'a ci de phosphorique concentrée contenant des ca tions métalliques (Zn 2+ et Al 3+ ement, Ce tra va il vise à étudier l'hydratation et les propriétés des ciments brushitiques à base de wollastonite dans la perspective d'une application au tra itement et a u conditionnement de déchets ra dioactifs de faible ou moyenne activité acides et/ou conta minés en strontium, vol.9, p.10
, Une étude cri stallographique montre par a illeurs que la brushite peut incorporer a u moins 30 % (mol/mol) de s trontium en s ubstitution du calcium dans sa structure. Des essais de piégeage du strontium par une pâte de ci ment broyée, menés en s us pension diluée, conduisent à une isotherme de sorption de type S, témoignant de l 'existence de plusieurs mécanismes de rétention. Enfin, un essai de lixiviation s ur un monolithe contenant du strontium révèle le bon confinement de ce dernier, a vec un coeffi ci ent de rétenti on Rd pl us de 100 foi s s upéri eur à cel ui obtenu a vec une, Le bore retarde la prise du ci ment ta ndis que l e zinc l 'accélère