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Title: Stabilization of lead-rich low-level mixed wastes in chemically bonded phosphate ceramic.

Abstract

A chemically bonded magnesium potassium phosphate ceramic has been developed by an acid-base reaction at room temperature, for use in stabilizing U.S. Department of Energy low-level mixed waste streams that include hazardous metals and low-level radioactive elements. Using this ceramic, we solidified, in monolithic waste forms, low-level mixed waste streams containing various levels of PbCl{sub 2} and PbCO{sub 3}. These final waste forms were evaluated for their land disposal suitability. The results showed low open porosity (1.48-4.61 vol.%); hence, low permeability, and higher compression strengths (4310-6734 psi) that were one order of magnitude above that required. The level of lead in the leachate following the Toxicity Characteristic Leaching Procedure test was reduced from 50,000 to <0.1 ppm. Leachability indexes from the long-term leaching test (ANS 16.1 test) were between 11.9 and 13.6. This excellent lead retention is due to its chemical fixation as insoluble lead phosphate and to physical encapsulation by the phosphate matrix.

Authors:
Publication Date:
Research Org.:
Argonne National Lab., IL (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
11184
Report Number(s):
ANL/ET/CP-97993
TRN: US0104342
DOE Contract Number:  
W-31109-ENG-38
Resource Type:
Conference
Resource Relation:
Conference: 101st Annual Meeting of the American Ceramic Society, Indianapolis, IN (US), 04/25/1999--04/28/1999; Other Information: PBD: 10 Aug 1999
Country of Publication:
United States
Language:
English
Subject:
12 MANAGEMENT OF RADIOACTIVE WASTES, AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; 36 MATERIALS SCIENCE; CERAMICS; COMPRESSION STRENGTH; LEAD PHOSPHATES; POTASSIUM PHOSPHATES; STABILIZATION; WASTE FORMS; LOW-LEVEL RADIOACTIVE WASTES; HAZARDOUS MATERIALS; MIXTURES; RADIOACTIVE WASTE PROCESSING; LEAD CHLORIDES; LEAD CARBONATES; POROSITY; LEACHING; CORROSION RESISTANCE; RADIOACTIVE WASTE DISPOSAL

Citation Formats

Jeong, S.-Y. Stabilization of lead-rich low-level mixed wastes in chemically bonded phosphate ceramic.. United States: N. p., 1999. Web.
Jeong, S.-Y. Stabilization of lead-rich low-level mixed wastes in chemically bonded phosphate ceramic.. United States.
Jeong, S.-Y. Tue . "Stabilization of lead-rich low-level mixed wastes in chemically bonded phosphate ceramic.". United States. https://www.osti.gov/servlets/purl/11184.
@article{osti_11184,
title = {Stabilization of lead-rich low-level mixed wastes in chemically bonded phosphate ceramic.},
author = {Jeong, S.-Y.},
abstractNote = {A chemically bonded magnesium potassium phosphate ceramic has been developed by an acid-base reaction at room temperature, for use in stabilizing U.S. Department of Energy low-level mixed waste streams that include hazardous metals and low-level radioactive elements. Using this ceramic, we solidified, in monolithic waste forms, low-level mixed waste streams containing various levels of PbCl{sub 2} and PbCO{sub 3}. These final waste forms were evaluated for their land disposal suitability. The results showed low open porosity (1.48-4.61 vol.%); hence, low permeability, and higher compression strengths (4310-6734 psi) that were one order of magnitude above that required. The level of lead in the leachate following the Toxicity Characteristic Leaching Procedure test was reduced from 50,000 to <0.1 ppm. Leachability indexes from the long-term leaching test (ANS 16.1 test) were between 11.9 and 13.6. This excellent lead retention is due to its chemical fixation as insoluble lead phosphate and to physical encapsulation by the phosphate matrix.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1999},
month = {8}
}

Conference:
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