US 6,258,333 B1 · Method for the simultaneous recovery of radionuclides from liquid radioactive wastes using a solvent

Abstract

The present invention relates to solvents, and methods, for selectively extracting and recovering radionuclides, especially cesium and strontium, rare earths and actinides from liquid radioactive wastes. More specifically, the invention relates to extracting agent solvent compositions comprising complex organoboron compounds, substituted polyethylene glycols, and neutral organophosphorus compounds in a diluent. The preferred solvent comprises a chlorinated cobalt dicarbollide, diphenyl-dibutylmethylenecarbamoylphosphine oxide, PEG-400, and a diluent of phenylpolyfluoroalkyl sulfone. The invention also provides a method of using the invention extracting agents to recover cesium, strontium, rare earths and actinides from liquid radioactive waste.

Claims14

Dependent claims

A method for simultaneously recovering cesium, strontium, rare earths and actinides from liquid radioactive waste comprising:

a) contacting the liquid radioactive waste with a solution of a complex organoboron compound, a substituted or unsubstituted polyethylene glycol, a neutral organophosphorus compound and a diluent,
b) separating out an organic phase and an aqueous phase,
c) mixing stripping reagents with the organic phase formed in step (b), so that an aqueous phase and an organic phase are formed, wherein the cesium, strontium, actinides and rare earths are extracted into the aqueous phase, and
d) recovering or disposing of the cesium, strontium, actinides and rare earths.

1 more element

Dependencies are inferred from the claim text.

Facts

Application

09/414,446Filed 7 Oct 1999

Priority

RU 9910341923 Feb 1999

Granted

10 Jul 2001

Term ends

Not estimatedThe source records don’t support an estimate.

Classification16 codes

C01G 56/001
Compounds of transuranic elements: preparation involving a liquid-liquid extraction, an adsorption or an ion-exchange
C22B 3/37
By liquid-liquid extraction using organic compounds: containing boron, silicon, selenium or tellurium
G21C 19/46
Of irradiated solid fuel: aqueous processes , e.g. by using organic extraction means, including the regeneration of these means
G21F 9/125
By absorption; by adsorption; by ion-exchange: by solvent extraction

Method for the simultaneous recovery of radionuclides from liquid radioactive wastes using a solvent

Life of this patent

Method for the simultaneous recovery of radionuclides from liquid radioactive wastes using a solvent

Life of this patent

Abstract

Claims14