Transport of chromium(VI) through a Cyanex 923-xylene flat-sheet supported liquid membrane

被引：74

作者：

Alguacil, FJ ^{[1
]}

Coedo, AG ^{[1
]}

Dorado, MT ^{[1
]}

机构：

[1] CSIC, Ctr Nacl Invest Met, E-28040 Madrid, Spain

来源：

HYDROMETALLURGY | 2000年 / 57卷 / 01期

关键词：

chromium (VI); cyanex; 923; flat-sheet supported liquid membrane;

D O I：

10.1016/S0304-386X(00)00103-1

中图分类号：

TF [冶金工业];

学科分类号：

0806 [冶金工程];

摘要：

The present investigation deals with carrier-facilitated membrane transport of chromium (VI) from chloride media across a flat-sheet supported liquid membrane (FSSLM) using as organic reagent the phosphine oxide, Cyanex 923. The permeation of Cr (VI) has been studied under various experimental conditions: stirring speed of the source phase, initial metal and carrier concentrations, organic phase diluent, HCl concentration in the source phase, composition of the stripping phase and support characteristics. The mass transfer coefficient was calculated as 67 mu m/s and the thickness of the aqueous boundary layer was calculated to be 15 mu m Chromium permeation and thus speciation across the membrane was also investigated, and the order found was: CrO42- = Cr2O72- > Cr3+. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：51 / 56

页数：6

共 23 条

[1]

THE PHOSPHINE OXIDES CYANEX-923 AND CYANEX-925 AS EXTRACTANTS FOR GOLD(I) CYANIDE AQUEOUS-SOLUTIONS [J].