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Title: Method for digesting spent ion exchange resins and recovering actinides therefrom using microwave radiation

Abstract

The present invention relates to methods for digesting diphosphonic acid substituted cation exchange resins that have become loaded with actinides, rare earth metals, or heavy metals, in a way that allows for downstream chromatographic analysis of the adsorbed species without damage to or inadequate elution from the downstream chromatographic resins. The methods of the present invention involve contacting the loaded diphosphonic acid resin with concentrated oxidizing acid in a closed vessel, and irradiating this mixture with microwave radiation. This efficiently increases the temperature of the mixture to a level suitable for digestion of the resin without the use of dehydrating acids that can damage downstream analytical resins. In order to ensure more complete digestion, the irradiated mixture can be mixed with hydrogen peroxide or other oxidant, and reirradiated with microwave radiation.

Inventors:
 [1];  [2]
  1. (Aiken, SC)
  2. Augusta, GA
Issue Date:
Research Org.:
Savannah River Site (SRS), Aiken, SC (United States)
OSTI Identifier:
872488
Patent Number(s):
5945342
Assignee:
Westinghouse Savannah River Company (Aiken, SC)
Patent Classifications (CPCs):
G - PHYSICS G01 - MEASURING G01N - INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
C - CHEMISTRY C22 - METALLURGY C22B - PRODUCTION AND REFINING OF METALS
DOE Contract Number:  
AC09-89SR18035
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
method; digesting; spent; exchange; resins; recovering; actinides; therefrom; microwave; radiation; relates; methods; diphosphonic; acid; substituted; cation; loaded; rare; earth; metals; heavy; allows; downstream; chromatographic; analysis; adsorbed; species; damage; inadequate; elution; involve; contacting; resin; concentrated; oxidizing; closed; vessel; irradiating; mixture; efficiently; increases; temperature; level; suitable; digestion; dehydrating; acids; analytical; ensure; complete; irradiated; mixed; hydrogen; peroxide; oxidant; reirradiated; hydrogen peroxide; cation exchange; heavy metal; microwave radiation; exchange resin; rare earth; earth metal; exchange resins; heavy metals; earth metals; phosphonic acid; diphosphonic acid; oxidizing acid; recovering actinide; acid substituted; involve contacting; /436/204/423/

Citation Formats

Maxwell, III, Sherrod L., and Nichols, Sheldon T. Method for digesting spent ion exchange resins and recovering actinides therefrom using microwave radiation. United States: N. p., 1999. Web.
Maxwell, III, Sherrod L., & Nichols, Sheldon T. Method for digesting spent ion exchange resins and recovering actinides therefrom using microwave radiation. United States.
Maxwell, III, Sherrod L., and Nichols, Sheldon T. Fri . "Method for digesting spent ion exchange resins and recovering actinides therefrom using microwave radiation". United States. https://www.osti.gov/servlets/purl/872488.
@article{osti_872488,
title = {Method for digesting spent ion exchange resins and recovering actinides therefrom using microwave radiation},
author = {Maxwell, III, Sherrod L. and Nichols, Sheldon T},
abstractNote = {The present invention relates to methods for digesting diphosphonic acid substituted cation exchange resins that have become loaded with actinides, rare earth metals, or heavy metals, in a way that allows for downstream chromatographic analysis of the adsorbed species without damage to or inadequate elution from the downstream chromatographic resins. The methods of the present invention involve contacting the loaded diphosphonic acid resin with concentrated oxidizing acid in a closed vessel, and irradiating this mixture with microwave radiation. This efficiently increases the temperature of the mixture to a level suitable for digestion of the resin without the use of dehydrating acids that can damage downstream analytical resins. In order to ensure more complete digestion, the irradiated mixture can be mixed with hydrogen peroxide or other oxidant, and reirradiated with microwave radiation.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1999},
month = {1}
}

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