Improvement of Cs leaching resistance of solidified radwastes with copper ferrocyanide (CFC)-vermiculite

Journal Article · Fri Jan 01 04:00:00 EST 1999 · Waste Management

DOI:https://doi.org/10.1016/S0956-053X(99)00133-6· OSTI ID:6447282

Huang, C T; Wu, G ^[1]

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1. Inst. of Nuclear Energy Research, Lung-Tan (Taiwan, Province of China). Chemical Engineering Div.

Cesium removal from de-ionized water, seawater, and limewater using copper ferrocyanide (CFC) and porous media including silica gel, bentonite, vermiculite, and zeolite as adsorbents were investigated; CFC was incorporated with vermiculite to prepare a compound adsorbent for improving the Cs-leaching resistance of solidified borate radwastes. It was shown that the Cs-removal efficiency by CFC, defined as the percentage of cesium removed or adsorbed from solution, was largely affected by pHs of the solutions. Good removal efficiency occurred at pHs ranging from 3 to 12 with the best from 7 to 10. Vermiculite and zeolite were shown to have better removal power than silica gel and bentonite, and vermiculite was chosen to incorporate with CFC to make compound adsorbents because of its good compatibility with CFC floc. Compound adsorbents with different CFC contents were used as additives in the solidification of radioactive borate wastes for improving the cesium leaching resistance of the solidified products. Experimental results showed that the cesium leachability index measured following the method described in ANSI/ANS 16.1 increased from 7.96 to 9.76 by adding 0.25% of a compound adsorbent containing 20% CFC and 80% vermiculite. It indicated that the compound adsorbent is very useful for improving cesium-leaching resistance of the solidified borate wastes.

• OSTI ID: 6447282
• Journal Information: Waste Management, Journal Name: Waste Management Vol. 19:4; ISSN WAMAE2; ISSN 0956-053X
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320305* -- Energy Conservation
Consumption
& Utilization-- Industrial & Agricultural Processes-- Industrial Waste Management
ADSORBENTS
ADSORPTION
ALKALI METALS
CESIUM
COPPER COMPOUNDS
CYANIDES
EFFICIENCY
ELEMENTS
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
IRON COMPOUNDS
MANAGEMENT
MATERIALS
METALS
MICA
MINERALS
PHASE TRANSFORMATIONS
PROCESSING
RADIOACTIVE WASTE MANAGEMENT
RADIOACTIVE WASTE PROCESSING
SILICATE MINERALS
SOLIDIFICATION
SORPTION
TRANSITION ELEMENT COMPOUNDS
VERMICULITE
WASTE MANAGEMENT
WASTE PROCESSING