Correlation of the extraction constants of the system Cd(II)-H3PO4/Cyanex 302-kerosene at different ionic strengths

被引：14

作者：

Almela, A ^{[1
]}

Elizalde, MP ^{[1
]}

机构：

[1] Univ Basque Country, Dpto Quim Analit, Bilbao 48080, Spain

来源：

FLUID PHASE EQUILIBRIA | 1998年 / 153卷 / 02期

关键词：

liquid-liquid equilibria; activity coefficient; cadmium; phosphoric acid; Cyanex; 302;

D O I：

10.1016/S0378-3812(98)00428-2

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Bromley's theory for calculating activity coefficients in order to correlate the values of cadmium extraction constant by Cyanex 302 from phosphoric acid solutions at different ionic strengths has been applied. A chemical model for the aqueous phase including the species H3PO4, H2PO4-, H5P2O8-, H6P2O8, CdRPO4 and CdH2PO4+ has been considered. The increase observed for the extraction constant value when increasing the phosphoric acid concentration is probably due to the significant increase of the cadmium activity coefficient. A reaction extraction including water as a component has been proposed, and the value of the thermodynamic extraction constant of log K-0 = 7.02 for the formation of CdR2(HR) species, HR being the major component of Cyanex 302, has been obtained. (C) 1998 Elsevier Science B.V. All rights reserved.

引用

页码：243 / 249

页数：7

共 12 条

[1] Cadmium(II) extraction from phosphoric media by bis(2,4,4-trimethylpentyl) thiophosphinic acid (Cyanex 302)
Almela, A
Elizalde, MP
Gomez, JM
[J]. FLUID PHASE EQUILIBRIA, 1998, 145 (02) : 301 - 310
[2] Development of a modified Bromley's methodology (MBM) for the estimation of ionic media effects on solution equilibria .2. Correlation of the molar and molal interaction parameters with the charge and crystal radii of the ions
Borge, G
Etxebarria, N
Fernandez, LA
Olazabal, MA
Madariaga, JM
[J]. FLUID PHASE EQUILIBRIA, 1996, 121 (1-2) : 99 - 109
[3] THERMODYNAMIC PROPERTIES OF STRONG ELECTROLYTES IN AQUEOUS-SOLUTIONS
BROMLEY, LA
[J]. AICHE JOURNAL, 1973, 19 (02) : 313 - 320
[4] DISSOCIATION OF PHOSPHORIC ACID SOLUTIONS AT 25 DEGREES
ELMORE, KL
HATFIELD, JD
DUNN, RL
JONES, AD
[J]. JOURNAL OF PHYSICAL CHEMISTRY, 1965, 69 (10) : 3520 - &
[5] LOUIS C, 1989, CAN J CHEM, V64, P608
[6] LOVO VMM, 1989, HDB ELECTROLYTE SOLU, V659
[7] *MICR, 1992, EXC 4 0
[8] THERMODYNAMICS OF ELECTROLYTES .1. THEORETICAL BASIS AND GENERAL EQUATIONS
PITZER, KS
[J]. JOURNAL OF PHYSICAL CHEMISTRY, 1973, 77 (02) : 268 - 277
[9] EXTRACTION OF CADMIUM FROM PHOSPHORIC-ACID SOLUTIONS WITH AMINES .3. A THERMODYNAMIC EXTRACTION MODEL
STENSTROM, S
[J]. HYDROMETALLURGY, 1987, 18 (01) : 1 - 20
[10] STENSTROM S, 1986, SOLVENT EXTR ION EXC, V4, P883, DOI 10.1080/07366298608917899

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