Selective separation of chromium from other elements by ion-exchange—II Anion- and cation-exchange in oxalic acid solutions

Mulokozi, A. M.; Mosha, Dms

doi:10.1016/0039-9140(75)80061-0

Cited by 13 publications

(1 citation statement)

References 11 publications

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“…Oxidative elution (49) effectively overcame the difficulties encountered in Cr(III) desorption (50). The retained Cr(III) could be quantitatively released upon oxidation to Cr(VI) in alkaline medium because the CrO 4 2Ϫ anion would be rejected by the cation exchanger.…”

Section: Recovery Of Cu(ii) and Cr(iiivi) By Ion Exchange 2191mentioning

confidence: 99%

Recovery of Copper (Ii) and Chromium (Iii,vi) From Electroplating-Industry Wastewater by Ion Exchange

Yalçın

Apak

Hızal

et al. 2001

Separation Science and Technology

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Two laboratory-scale separation processes have been developed for the recovery of copper (II) from acidic and cyanide-containing alkaline wastewater of electroplating industries. Acidic bath wastes were treated with Dowex 50X8, a strongly acidic cation-exchange resin, and the retained copper was eluted with H 2 SO 4 . The cyanide-containing alkaline bath waste was first oxidized with excessive hypochlorite, then neutralized, and recovered by the use of Amberlite IRC-718 chelating resin. Copper was eluted with H 2 SO 4 .The two different valencies of chromium have been recovered from electroplating-industry wastewater by different separation processes: The predominant valency, Cr(VI), was retained on a strongly basic Dowex 1X8 resin and eluted with a NaCl and ORDER REPRINTS NaOH solution. Alternatively, Cr(III), either existing originally in electroplating-industry waste-rinse mixtures or converted from Cr(VI) by reduction with Na 2 SO 3 , could be recovered by a weakly acidic Amberlite IRC-50 resin and eluted with a solution containing H 2 O 2 and NaOH. Where plating industry wastes contain high levels of organic contamination, Cr(VI) would be naturally reduced to Cr(III) upon acidification, and it may be more economical to recover all chromium as Cr(III).

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Section: Recovery Of Cu(ii) and Cr(iiivi) By Ion Exchange 2191mentioning

confidence: 99%