Document Detail

Selective extraction of zinc(II) over iron(II) from spent hydrochloric acid pickling effluents by liquid-liquid extraction.
MedLine Citation:
PMID:  17570579     Owner:  NLM     Status:  MEDLINE    
The selective removal of zinc(II) over iron(II) by liquid-liquid extraction from spent hydrochloric acid pickling effluents produced by the zinc hot-dip galvanizing industry was studied at room temperature. Two distinct effluents were investigated: effluent 1 containing 70.2g/L of Zn, 92.2g/L of Fe and pH 0.6, and effluent 2 containing 33.9 g/L of Zn, 203.9g/L of Fe and 2M HCl. The following extractants were compared: TBP (tri-n-butyl phosphate), Cyanex 272 [bis(2,4,4-trimethylpentyl)phosphinic acid], Cyanex 301 [bis(2,4,4-trimethylpentyl) dithiophosphinic acid] and Cyanex 302 [bis(2,4,4-trimethylpentyl) monothiophosphinic acid]. The best separation results were obtained for extractants TBP and Cyanex 301. Around 92.5% of zinc and 11.2% of iron were extracted from effluent 1 in one single contact using 100% (v/v) of TBP. With Cyanex 301, around 80-95% of zinc and less than 10% of iron were extracted from effluent 2 at pH 0.3-1.0. For Cyanex 272, the highest extraction yield for zinc (70% of zinc with 20% of iron extraction) was found at pH 2.4. Cyanex 302 presented low metal extraction levels (below 10%) and slow phase disengagement characteristics. Reactions for the extraction of zinc with TBP and Cyanex 301 from hydrochloric acid solution were proposed.
Marcelo Borges Mansur; Sônia Denise Ferreira Rocha; Fernando Silva Magalhães; Jeaneth dos Santos Benedetto
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't     Date:  2007-05-13
Journal Detail:
Title:  Journal of hazardous materials     Volume:  150     ISSN:  0304-3894     ISO Abbreviation:  J. Hazard. Mater.     Publication Date:  2008 Feb 
Date Detail:
Created Date:  2008-01-21     Completed Date:  2008-05-06     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9422688     Medline TA:  J Hazard Mater     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  669-78     Citation Subset:  IM    
Department Engenharia Metalúrgica e de Materiais, Universidade Federal de Minas Gerais, Rua Espírito Santo, 35, # 2 andar, Centro, 30130-090 Belo Horizonte, MG, Brazil.
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MeSH Terms
Hydrochloric Acid / chemistry*
Industrial Waste
Iron / chemistry*
Organothiophosphorus Compounds / chemistry
Phosphinic Acids / chemistry
Phosphoric Acid Esters / chemistry
Waste Disposal, Fluid / methods*
Water Pollutants, Chemical / chemistry*
Zinc / chemistry*
Reg. No./Substance:
0/Cyanex 272; 0/Cyanex 302; 0/Industrial Waste; 0/Organothiophosphorus Compounds; 0/Phosphinic Acids; 0/Phosphoric Acid Esters; 0/Water Pollutants, Chemical; 0/bis(2,4,4-trimethylpentyl)dithiophosphinic acid; 126-73-8/tributyl phosphate; 7439-89-6/Iron; 7440-66-6/Zinc; 7647-01-0/Hydrochloric Acid

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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