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Immobilization of ASH by Microwave Melting

Published online by Cambridge University Press:  25 February 2011

Kazuki Morita ,
Vinh Q. Nguyen ,
Ron Nakaoka  and
John D. Mackenzie
Kazuki Morita
Affiliation:
University of California Los Angeles, Department of Materials Science and Engineering, Los Angeles, CA 90024
Vinh Q. Nguyen
Affiliation:
University of California Los Angeles, Department of Materials Science and Engineering, Los Angeles, CA 90024
Ron Nakaoka
Affiliation:
Los Alamos National Laboratory, Waste Management, Los Alamos, NM 87545
John D. Mackenzie
Affiliation:
University of California Los Angeles, Department of Materials Science and Engineering, Los Angeles, CA 90024
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Abstract

Non-radioactive ash was immobilized via microwave melting. The ash composed mainly of silica (SiO2), titania (TiO2), calcia (CaO), alumina (Al2O3), and carbon (C). The ash was melted with various additives, such as magnetite (Fe3O4), lithium carbonate (Li2CO3), sodium carbonate (Na2CO3), and boron oxide (B2O3) by using a 2.45 GHz, 750 W microwave oven. Samples with different ash and additive concentrations were melted when subjected to microwave radiation. Ease of melting was dependent on the carbon and magnetite concentrations. Melted samples were characterized by X-ray diffraction and scanning electron microscopy (SEM), and subjected to the Toxicity Characteristic Leaching Procedure in regard to lead (Pb) immobilization. Melted samples with more than 30 wt% additives has an undetectable leaching rate of less than 0.1 ppm of lead for TCLP test, which was found to be due to the reduction and evaporation of the lead during melting. More than 80 % of the lead was lost through evaporation leaving less than 0.1 wt% Pb in the melted glass.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 269: Symposium L – Microwave Processing of Materials III , 1992 , 471
Copyright
Copyright © Materials Research Society 1992

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References

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