Extraction of heavy metals from solid matrices with ligands and supercritical carbon dioxide

Chr Kersch*, G. F. Woerlee, G. J. Witkamp

*Corresponding author for this work

Research output: Contribution to conferencePaperpeer-review

1 Scopus citations

Abstract

The extraction efficiency of heavy metals from sand matrices with supercritical carbon dioxide is influenced by a number of process parameters. Cyanex 302 results in efficiencies of greater than 50% for most of the metals. The amount of Cd extracted with Aliquat 336, in combination with NaCl solution, was significantly greater than for all metals tested. (Di-2(ethylhexyl)-phosphoric acid)and (di-isooctylphosphinic acid) are most effective for Zn extraction. In general, Hg was removed from the matrices entirely. High pressure enhances the complex solubility in CO2, leading to more effective extraction. Highest extraction efficiencies were obtained at water concentrations in the range of 5 wt% to 10 wt%, under which 99% Cd and Cu extraction is obtained.

Original languageEnglish (US)
Pages161-165
Number of pages5
StatePublished - Dec 1 1999
Externally publishedYes
EventMetal Separation Technology Beyond 2000: Integrating Novel Chemistry with Processing - Oahu, HI, USA
Duration: Jun 13 1999Jun 18 1999

Conference

ConferenceMetal Separation Technology Beyond 2000: Integrating Novel Chemistry with Processing
CityOahu, HI, USA
Period06/13/9906/18/99

ASJC Scopus subject areas

  • Engineering(all)

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