Solvent extraction of zinc from ammoniacal/ammonium chloride solutions by a sterically hindered β-diketone and its mixture with tri-n-octylphosphine oxide

被引：30

作者：

Fu, Weng ^{[1
]}

Chen, Qiyuan ^{[1
]}

Wu, Qian ^{[1
]}

Hu, Huiping ^{[1
]}

Bai, Lan ^{[1
]}

机构：

[1] Cent S Univ, Inst Chem & Chem Engn, Changsha 410083, Peoples R China

来源：

HYDROMETALLURGY | 2010年 / 100卷 / 3-4期

关键词：

Solvent extraction; Zinc; Ammonia; Ammonium chloride; Sterically hindered beta-diketones; TOPO; Synergism; THERMODYNAMICS; COMPLEXES; COBALT; ZN;

D O I：

10.1016/j.hydromet.2009.10.013

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

The extraction of zinc from ammoniacal/ammonium chloride solutions using a sterically hindered beta-diketone, 4-ethyl-1-phenyl-1,3-octadione (XI-55, HA) as the extractant has been investigated in the presence or absence of tri-n-octylphosphine oxide (TOPO, B). The results indicate that the mixture of XI-55 and TOPO shows evident synergistic effects on zinc extraction. Zinc is extracted as ZnA2(B) by the mixture and the stability constant of ZnA(2)B is 2.08. Thermodynamic parameters Delta H, Delta S and Delta G are determined. which shows that the extractions of zinc by both XI-55 extraction system and the XI-55-TOPO synergistic extraction system are exothermic driven. The concentration of total ammonia has great influence on the extraction constants and distribution ratio for both extraction systems. FT-IR studies on zinc loaded organic phases confirm the non-extractability of zinc ammine complexes. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：116 / 121

页数：6