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Title: Process for the encapsulation and stabilization of radioactive, hazardous and mixed wastes

Abstract

The present invention provides a method for encapsulating and stabilizing radioactive, hazardous and mixed wastes in a modified sulfur cement composition. The waste may be incinerator fly ash or bottom ash including radioactive contaminants, toxic metal salts and other wastes commonly found in refuse. The process may use glass fibers mixed into the composition to improve the tensile strength and a low concentration of anhydrous sodium sulfide to reduce toxic metal solubility. The present invention preferably includes a method for encapsulating radioactive, hazardous and mixed wastes by combining substantially anhydrous wastes, molten modified sulfur cement, preferably glass fibers, as well as anhydrous sodium sulfide or calcium hydroxide or sodium hydroxide in a heated double-planetary orbital mixer. The modified sulfur cement is preheated to about 135.degree..+-.5.degree. C., then the remaining substantially dry components are added and mixed to homogeneity. The homogeneous molten mixture is poured or extruded into a suitable mold. The mold is allowed to cool, while the mixture hardens, thereby immobilizing and encapsulating the contaminants present in the ash.

Inventors:
 [1];  [2];  [3]
  1. (Patchogue, NY)
  2. (Wading River, NY)
  3. (Bayport, NY)
Issue Date:
Research Org.:
ASSOC UNIVERSITIES INC
OSTI Identifier:
871187
Patent Number(s):
5678234
Application Number:
08/334,930
Assignee:
Associated Universities, Inc. (Washington, DC) BNL
DOE Contract Number:  
AC02-76CH00016
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
process; encapsulation; stabilization; radioactive; hazardous; mixed; wastes; provides; method; encapsulating; stabilizing; modified; sulfur; cement; composition; waste; incinerator; fly; ash; bottom; including; contaminants; toxic; metal; salts; commonly; found; refuse; glass; fibers; improve; tensile; strength; concentration; anhydrous; sodium; sulfide; reduce; solubility; preferably; combining; substantially; molten; calcium; hydroxide; heated; double-planetary; orbital; mixer; preheated; 135; degree; remaining; dry; components; added; homogeneity; homogeneous; mixture; poured; extruded; suitable; mold; allowed; cool; hardens; immobilizing; toxic metal; glass fibers; cement composition; radioactive contaminants; sodium hydroxide; mixed waste; mixed wastes; metal salts; fly ash; metal salt; tensile strength; calcium hydroxide; glass fiber; substantially dry; sodium sulfide; molten mixture; including radioactive; combining substantially; encapsulating radioactive; radioactive contaminant; /588/106/

Citation Formats

Colombo, Peter, Kalb, Paul D., and Heiser, III, John H. Process for the encapsulation and stabilization of radioactive, hazardous and mixed wastes. United States: N. p., 1997. Web.
Colombo, Peter, Kalb, Paul D., & Heiser, III, John H. Process for the encapsulation and stabilization of radioactive, hazardous and mixed wastes. United States.
Colombo, Peter, Kalb, Paul D., and Heiser, III, John H. Fri . "Process for the encapsulation and stabilization of radioactive, hazardous and mixed wastes". United States. https://www.osti.gov/servlets/purl/871187.
@article{osti_871187,
title = {Process for the encapsulation and stabilization of radioactive, hazardous and mixed wastes},
author = {Colombo, Peter and Kalb, Paul D. and Heiser, III, John H.},
abstractNote = {The present invention provides a method for encapsulating and stabilizing radioactive, hazardous and mixed wastes in a modified sulfur cement composition. The waste may be incinerator fly ash or bottom ash including radioactive contaminants, toxic metal salts and other wastes commonly found in refuse. The process may use glass fibers mixed into the composition to improve the tensile strength and a low concentration of anhydrous sodium sulfide to reduce toxic metal solubility. The present invention preferably includes a method for encapsulating radioactive, hazardous and mixed wastes by combining substantially anhydrous wastes, molten modified sulfur cement, preferably glass fibers, as well as anhydrous sodium sulfide or calcium hydroxide or sodium hydroxide in a heated double-planetary orbital mixer. The modified sulfur cement is preheated to about 135.degree..+-.5.degree. C., then the remaining substantially dry components are added and mixed to homogeneity. The homogeneous molten mixture is poured or extruded into a suitable mold. The mold is allowed to cool, while the mixture hardens, thereby immobilizing and encapsulating the contaminants present in the ash.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1997},
month = {11}
}

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