Zeolites for fixation of cesium and strontium from radwastes by thermal and hydrothermal treatments

Journal Article · Thu Jan 01 04:00:00 EST 1981 · Nucl. Chem. Waste Manage.; (United States)

DOI:https://doi.org/10.1016/0191-815X(81)90052-8· OSTI ID:6749171

Komarneni, S; Roy, R

Several zeolites were heated in air up to 100/degree/C for 4 h or heated hydrothermally at 300/degree/C for 4 weeks under a confining pressure of 300 bar after loading with Cs or Sr to determine the extent and nature of Cs and Sr fixation. Cs-loaded zeolites leached with 0.1 N KCl solution indicated that clinoptilolite, chabazite, erionite, and mordenite fixed only 7% to 26% of their Cs after heat treatment up to 800/degree/C. However, analcite and phillipsite fixed 84% and 81% of their Cs by heat treatments to only 200 and 500/degree/C, respectively. The fixation in analcite may be attributed to its dehydration, while in phillipsite the fixation is attributed to its transformation to cesium aluminosilicate minerals. Analcite and phillipsite were also very effective in Sr fixation just as they were in Cs fixation. Analcite and phillipsite fixed 86% and 91% of their Sr by heat treatment to 420 and 600/degree/C, respectively. Phillipsite may be ideally suited for radioactive waste decontamination followed by thermal or hydrothermal treatment to fix the sorbed Cs and Sr. 17 refs.

• Research Organization: Pa State Univ, University Park, USA
• OSTI ID: 6749171
• Journal Information: Nucl. Chem. Waste Manage.; (United States), Journal Name: Nucl. Chem. Waste Manage.; (United States) Vol. 2:4; ISSN NCWMD
• Country of Publication: United States
• Language: English

Related Subjects

052001* -- Nuclear Fuels-- Waste Processing
12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
ALKALI METALS
ALKALINE EARTH METALS
CESIUM
CLINOPTILOLITE
DISSOLUTION
ELEMENTS
EVALUATION
HEAT TREATMENTS
HIGH TEMPERATURE
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
LEACHING
MANAGEMENT
MATERIALS
MEDIUM TEMPERATURE
METALS
MINERALS
MORDENITE
PHASE TRANSFORMATIONS
PROCESSING
RADIOACTIVE WASTE PROCESSING
SEPARATION PROCESSES
SILICATE MINERALS
SOLID WASTES
SOLIDIFICATION
STRONTIUM
USES
WASTE MANAGEMENT
WASTE PROCESSING
WASTES
ZEOLITES