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Titolo:
Selective flotation of zinc(II) and silver(I) ions from dilute aqueous solutions
Autore:
Charewicz, WA; Holowiecka, BA; Walkowiak, W;
Indirizzi:
Wroclaw Univ Technol, Inst Inorgan Chem & Met Rare Elements, PL-50370 Wroclaw, Poland Wroclaw Univ Technol Wroclaw Poland PL-50370 s, PL-50370 Wroclaw, Poland
Titolo Testata:
SEPARATION SCIENCE AND TECHNOLOGY
fascicolo: 12, volume: 34, anno: 1999,
pagine: 2447 - 2460
SICI:
0149-6395(1999)34:12<2447:SFOZAS>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Soggetto:
FOAM SEPARATION; TRANSPORT; MEMBRANES; REMOVAL; METALS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
34
Recensione:
Indirizzi per estratti:
Indirizzo: Walkowiak, W Wroclaw Univ Technol, Inst Inorgan Chem & Met Rare Elements, PL-50370 Wroclaw, Poland Wroclaw Univ Technol Wroclaw Poland PL-50370 roclaw, Poland
Citazione:
W.A. Charewicz et al., "Selective flotation of zinc(II) and silver(I) ions from dilute aqueous solutions", SEP SCI TEC, 34(12), 1999, pp. 2447-2460

Abstract

An experimental investigation is presented of the batch competitive flotation of zinc(II) and silver(I) ions from dilute aqueous solutions with sodium dodecylsulfate and ammonium tetradecylsulfonate as anionic surfactants and with cetylpyridinium chloride as a cationic surfactant. The sequence of growing affinity of metal cations to anionic surfactants is the same as the sequence of ionic potential values of the studied cations: Ag+ < Zn2+. The presence of potassium sulfate in aqueous solution has a negative influence of Zn2+ foam separation with a anionic surfactant which is due to competition for the surfactant between Zn2+ and K+ cations. Also, the effect of inorganic ligands (i.e., thiosulfates, thiocyanates, and cyanides) on the selectivity of ion flotation of Zn(II) and Ag(I) is established. Results are discussed in terms of the complex species of zinc(II) and silver(I). At a total S2O23- concentration of 3 x 10(-6) M, the silver(I) is floated as a mixture of anions [Ag(S2O3)](-) and [Ag(S2O3)(2)](3-), whereas zinc(II) remains in the aqueous phase as Zn2+. At total concentrations of SCN- from 1 x 10(-4) to 2 x 10(-3) M, silver(I) is floated as a mixture of [Ag(SCN)(2)](-) and AgSCN species. Partial separation of zinc(II) from silver(I) can be achieved in the presence of CN- ligands at total concentrations varying from 2.5x 10(-4) to 1.0 x 10(-3) M. The affinity of the studied cyanide complexes to cetylpyridinium chloride follows the order [Ag(CN)(2)](-) < [Zn(CN)(4)](2-) + [Zn(CN)(3)](-).

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Documento generato il 25/11/20 alle ore 04:21:55