Selective recovery of mercury(II) from industrial wastewaters II. Anion exchange of Hg(II) chlorocomplexes

Strong-base and weak-base anion exchangers are able to remove mercury(II) selectively from chloride-containing solutions at pH 1.5. Leakages are lower from the strong base resin IRA900 than from the weakly basic IRA93, but at initial Hg concentrations of 10–40 mg/l mercury leakage from both is below...

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Bibliographic Details
Published in:Reactive polymers 1994, Vol.22 (2), p.131-138
Main Authors: Becker, N.S.C., Eldridge, R.J.
Format: Article
Language:English
Subjects:
Anion exchange
Applied sciences
Complexes
Exact sciences and technology
Exchange resins and membranes
Forms of application and semi-finished materials
Mercury
Polymer industry, paints, wood
Recovery
Reduction
Regeneration
Technology of polymers
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Summary:Strong-base and weak-base anion exchangers are able to remove mercury(II) selectively from chloride-containing solutions at pH 1.5. Leakages are lower from the strong base resin IRA900 than from the weakly basic IRA93, but at initial Hg concentrations of 10–40 mg/l mercury leakage from both is below 20 μg/l over at least several hundred bed volumes. Conventional regenerants are ineffective, but Hg(II) is readily desorbed by complexing agents. Desorption reaches 100% in 5 bed volumes of 1.5 M aqueous 1,2-diaminoethane or about 15 bed volumes of 1 M sodium sulfite solution. In some cases the desorbed Hg(II) complex crystallizes from the regeneration effluent, allowing the regenerant to be recycled. Chemical or electrolytic reduction of the recovered Hg(II) yields valuable byproduct Hg(I) or Hg(0).
ISSN:0923-1137
1873-1678
DOI:10.1016/0923-1137(94)90144-9