ADSORBENT FOR RADIOACTIVE ELEMENT-CONTAINING WASTE, AND METHOD OF IMMOBILIZING RADIOACTIVE ELEMENT

摘要

PROBLEM TO BE SOLVED: To provide an adsorbent capable of adsorption-collecting efficiently volatile iodine, radioactive anions in effluent, or the like, and having excellent crack resistance of a solidified body after solidification treatment, and a method of immobilizing a radioactive element-containing waste capable of providing an encapsulation property of the radioactive element-containing waste and long term stability.;SOLUTION: This adsorbent for the radioactive element-containing waste comprises spherical lamellar double hydroxide of a nonstoichiometric compound expressed by general formulas (a): [M²⁺_1-x M³⁺_x(OH)₂]^x+[A^n-_x/n-mH²O]^x-, (b): [Al₂Li(OH)₆]^x+[A^n-_x/n-mH₂O]^x-, where 0.1≤x≤0.4, and 0m; n is a natural number of 1-4; M²⁺ represents at least one kind of divalent metals; M³⁺ represents at least one kind of trivalent metals; and A^n- represents at least one kind of n-valent of ion-exchangeable anions.;COPYRIGHT: (C)2006,JPO&NCIPI