Use of modified membrane carrier system for recovery of gold cyanide from alkaline cyanide media using hollow fiber supported liquid membranes: feasibility studies and mass transfer modeling

被引:37
作者
Kumar, A [1 ]
Haddad, R [1 ]
Benzal, G [1 ]
Ninou, R [1 ]
Sastre, AM [1 ]
机构
[1] Univ Politecn Catalunya, Dept Chem Engn, ETSEIB, E-08028 Barcelona, Spain
关键词
gold; LIX79; cyanex; 921; hollow fiber liquid membrane;
D O I
10.1016/S0376-7388(00)00344-6
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
This investigation is concerned with the applications of hollow fiber supported liquid membranes for the recovery of gold(I) (Au(CN)(2)(-)) from alkaline cyanide media using microporous hydrophobic hollow fiber with modified membrane extractant (carrier). The organic extractant used fur gold(I) permeation was LIX79 alone and mixture of TOPO+LIX79 diluted with n-heptane. The mixture of LIX79+TOPO affords better performance than LIX79 alone. P-Au value was 2.8 x 10(-5) cm/s with LIX79 alone, whereas P-Au value was found to be 9.5 x 10(-5) cars with only TOPO membrane carrier. Transport of Au(CN)(2) from alkaline cyanide solutions with TOPO alone was also observed indicating gold(I) complexation takes place most likely by solvation reaction mechanism (M+...Au(CN)(2). S-n). The permeability of Au(I) was enhanced by 220 folds by using mixture of TOPO+LIX79 with respect to only LIX79 and 57 times with respect to only TOPO while maintaining aqueous feed at pH 10.3. A model is presented which describes the transport mechanism, indicating different rate-controlling steps. The validity of this model was evaluated with experimental data and found to tie in well with theoretical values. In addition, selectivity of Au(I) with respect to Zn(II) and Ag(I) cyanide salts was improved. It was possible to recover Au(I) in presence of other metal cyanide salts of Fe(II), Cull), Ni(II), Ag(I) and Zn(II) which approves the potential of mixture of extractants (TOPO+LIX79) for hydrometallurgical solutions. (C) 2000 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:17 / 30
页数:14
相关论文
共 25 条
[1]   COUPLED TRANSPORT MEMBRANES .3. THE RATE-LIMITING STEP IN URANIUM TRANSPORT WITH A TERTIARY AMINE [J].
BABCOCK, WC ;
BAKER, RW ;
LACHAPELLE, ED ;
SMITH, KL .
JOURNAL OF MEMBRANE SCIENCE, 1980, 7 (01) :89-100
[2]   Modification and preparation of polymeric adsorbents for precious-metal extraction in hydrometallurgical processes [J].
Cortina, JL ;
Meinhardt, E ;
Roijals, O ;
Marti, V .
REACTIVE & FUNCTIONAL POLYMERS, 1998, 36 (02) :149-165
[3]  
COX M, 1988, DEV SOLVENT EXTRACTI, P177
[5]  
DANESI PR, 1988, DEV SOLVENT EXTRACTI, P159
[6]   Mechanistic study of active transport of silver(I) using sulfur containing novel carriers across a liquid membrane [J].
El Aamrani, FZ ;
Kumar, A ;
Beyer, L ;
Florido, A ;
Sastre, AM .
JOURNAL OF MEMBRANE SCIENCE, 1999, 152 (02) :263-275
[7]   Hollow fiber supported liquid membrane for the separation/concentration of gold(I) from aqueous cyanide media: Modeling and mass transfer evaluation [J].
Kumar, A ;
Sastre, AM .
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, 2000, 39 (01) :146-154
[8]  
KUMAR A, UNPUB SOLVENT EXTRAC
[9]  
KUMAR A, 1999, P INT SOLV EXTR C IS
[10]  
KUMAR A, 1998, Patent No. 9801736