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Title: Evaluation of extractant-coated ferromagnetic microparticles for the recovery of hazardous metals from waste solution.

A magnetically assisted chemical separation (MACS) process was developed earlier at Argonne National Laboratory (ANL). This compact process was designed for the separation of transuranics (TRU) and radionuclides from the liquid waste streams that exist at many DOE sites, with an overall reduction in waste volume requiring disposal. The MACS process combines the selectivity afforded by solvent extractant/ion exchange materials with magnetic separation to provide an efficient chemical separation. Recently, the MACS process has been evaluated with acidic organophosphorus extractants for hazardous metal recovery from waste solutions. Moreover, process scale-up design issues have been addressed with respect to particle filtration and recovery. Two acidic organophosphorus compounds have been investigated for hazardous metal recovery, bis(2,4,4-trimethylpentyl) phosphinic acid (Cyanex{reg_sign} 272) and bis(2,4,4-trimethylpentyl) dithiophosphinic acid (Cyanex{reg_sign} 301). Coated onto magnetic microparticles, these extractants demonstrated superior recovery of hazardous metals from solution, relative to what was expected on the basis of results from solvent extraction experiments. The results illustrate the diverse applications of MACS technology for dilute waste streams. Preliminary process scale-up experiments with a high-gradient magnetic separator at Oak Ridge National Laboratory have revealed that very low microparticle loss rates are possible.
Authors:
Publication Date:
OSTI Identifier:
10770
Report Number(s):
ANL/CMT/CP-96386
TRN: US0103841
DOE Contract Number:
W-31109-ENG-38
Resource Type:
Conference
Resource Relation:
Conference: 10th Symposium on Separation Science and Technology for Energy Applications, Gatlinburg, TN (US), 10/20/1997--10/24/1997; Other Information: PBD: 8 May 1998
Research Org:
Argonne National Lab., IL (US)
Sponsoring Org:
US Department of Energy (US)
Country of Publication:
United States
Language:
English
Subject:
12 MANAGEMENT OF RADIOACTIVE WASTES, AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; ADSORBENTS; DESIGN; FILTRATION; LIQUID WASTES; MAGNETIC SEPARATORS; RADIOISOTOPES; SOLVENT EXTRACTION; ALPHA-BEARING WASTES; ION EXCHANGE MATERIALS; PHOSPHINIC ACIDS; MAGNETIC MATERIALS