The role of additives in metal extraction in oil/water systems

Solvent Extraction and Ion Exchange

Volumn 29, Issue 3, 2011, Pages 363-383

  Perera, Jilska M ^a   Stevens, Geoffrey W ^a  

^a UNIVERSITY OF MELBOURNE   (Australia)

Author keywords

Interfacial phenomena; Kinetics; Liquid liquid extraction; Solvent extraction

Indexed keywords

COMPLEX SYSTEMS; EXPERIMENTAL TECHNIQUES; EXTRACTANTS; INTERFACIAL PHENOMENA; INTERFACIAL PROPERTY; LIQUID-LIQUID EXTRACTION; METAL EXTRACTIONS; METAL SEPARATION; MODELLING STUDIES; MULTI-COMPONENT SYSTEMS; OIL/WATER; ROLE OF ADDITIVES; SEPARATION SYSTEMS;

LIQUIDS; METALS; SOLVENTS; SURFACE ACTIVE AGENTS;

SOLVENT EXTRACTION;

EID: 79957872948     PISSN: 07366299     EISSN: 15322262     Source Type: Journal    
DOI: 10.1080/07366299.2011.573433     Document Type: Review

References (105)

1. Cox, M. Chapter 1. In Science and Practice of Liquid-Liquid Extraction, Thornton, J.D., Ed.; Clarendon Press: Oxford, 1992.
2. Rydberg, J.; Musikas, C.; Choppin, G., Eds. Principles and Practices of Solvent Extraction; Marcel Dekker: New York, 1992.
3. Syzamanowski, J. Hydroxyoximes and Copper Hydrometallurgy; CRC Press: Boca Raton, FL, 1993.
4. Nishihama, S.; Hirai, T.; Komasawa, I. Review of advanced liquidliquid extraction systems for the separation of metal ions by a combination of conversion of the metal species with chemical reaction. Ind. Eng. Chem. Res. 2001, 40, 3085-3091.
5. Stevens, G.W.; Perera, J. M.; Grieser, F. Interfacial aspects of metal ion extraction in liquid-liquid systems. Rev. Chem. Eng. 2001, 17, 87-110.
6. Syzamanowski, J. Kinetics and interfacial phenomena. Solvent Extr. Ion Exch. 2000, 18, 729-751.
7. Komasawa, I.; Otake, T.; Muraoka, T. Extraction kinetics of copper with hydroxyoxime extractant. J. Chem. Eng. Jpn. 1980, 13, 204-208.
8. Komasawa, I.; Otake, T.; Ogawa, Y. The effect of diluent in the liquidliquid extraction of cobalt and nickel using acidic organophosphorus compounds. J. Chem. Eng. Jpn. 1984, 17, 410-417.
9. Komasawa, I.; Otake, T. The effect of diluent in the liquidliquid extraction of copper and nickel using 2-hydroxy-5-nonylbenzophenone oxime. J. Chem. Eng. Jpn. 1983, 16, 377-383.
10. Yoshizuka, K.; Arita, H.; Baba, Y.; Inoue, K. Equilibria of solvent extraction of copper (II) with 5-dodecylsalicylaldoxime. Hydrometallurgy 1990, 23, 247-261.
11. Liu, J.; Wang, W. W.; Li, D. Interfacial behavior of primary amine N1923 and the kinetics of thorium (IV) extraction in sulfate media. Colloids Surf. A: Physicochem. Eng. Aspects 2007, 311, 124-130.
12. Sladek, P.; Navratil, O.; Nouaman, M.; Groenwald, A.; Herrmann, E. Effect of the type of organic diluents on the solvent extraction of some rare earth elements by acidic μ-imido phosphorous compounds. Solvent Extr. Res. Dev. Jpn. 1995, 2, 1-7.
13. Bouboulis, C. J. Diluents in the separation of cobalt and nickel. Can. Inst. Min. Metall. Spec. 1979, 21, 32-39.
14. Flett, D. S. Chemical kinetics and mechanisms in solvent extraction of copper chelates. Accounts of Chemical Research 1977, 10, 99-104.
15. Kuipa, P. K.; Hughes, M. A. Diluent effect on the solvent extraction rate of copper, Sep. Sci. Tech. 2002, 37, 1135-1152.
16. Connor, J. A.; Tindale, N.; Dalton, R. F. Mechanistic studies of extraction of copper (II) from the aqueous acid by 5-nonly- 2-hydroxybenzaldoximes in organic solvents. The effects of mixed solvents and modifiers. Hydrometallurgy 1991, 26, 265-280.
17. Syzamanowski, J.; Prochaska, K. The surface excess and the rate of copper extraction by hydroxyoximes. J. Chem. Tech. Biotechnol. 1987, 40, 177-193.
18. Wu, D.; Xiong, Y.; Li, D.; Meng, S. Interfacial behavior of Cyanex 302 and kinetics of lanthanum extraction. J. Colloid Interface Sci. 2005, 290, 235-240.
19. Zhao, J.; Sun, X.; Li, W.; Meng, S.; Li, D. Interfacial behavior of DEHEHP and the kinetics of cerium(IV) extraction in nitrate media. J. Colloid Interface Sci. 2006, 294, 429-435.
20. Biswas, R. K.; Banu, R. A.; Islam, M. N. Some physico-chemical properties of D2EHPA Part 2. Distribution, dimerization and acid dissociation constants in n-hexane/a M (Na+, H+)SO4 2− system, interfacial adsorption and excess properties. Hydrometallurgy 2003, 69, 157-168.
21. Singh, S. K.; Tripathi, S. C.; Singh, D. K. Studies on the recovery of uranium from phosphoric acid medium using synergistic mixtures of (2-ethyl hexyl) phosphonic acid, mono (2-ethyl hexyl) ester (PC88A) and tri-n-octylphosphine oxide (TOPO). Sep. Sci. Tech. 2010, 45, 824-831.
22. Caravaca, C. Gold (I) extraction from cyanide media by the primary amine Primene 81R/iso-decanol system. Hydrometallurgy 1994, 35, 53-66.
23. Mellah, A.; Benachour, D. Solvent extraction of heavy metals contained in phosphoric acid solutions by 7-(4-ethyl-1-methyloctyl)-8- hydroxyquinoline in kerosene diluent. Hydrometallurgy 2006, 81, 100-110.
24. Allal, K. M.; Hauchard, D.; Stambouli, M.; Pareau, D.; Durand, G. Solvent extraction of titanium by tributylphosphate, trioctylphosphine oxide and decanol from chloride media.Hydrometallurgy 1997, 45, 113-128.
25. Uzoukwu, B. A.; Gloe, K.; Duddeck, H. Extraction of uranium (VI) and vanadium (V) with 4-adipoyl and4-sebacoyl derivatives of bis(1- phenyl-3-methyl-pyrazolone-5) and effect of decanol on the distribution behavior of these metal ions. Solvent Extr. Ion Exch. 1998, 16, 751-774.
26. Harrington, P. J.; Stevens, G.W. Study of Cr (VI)/tertiary amine reaction kinetics using a modified rotating diffusion cell. Solvent Extr. Ion Exch. 2000, 18, 907-932.
27. Prochaska, K.; Cierpiszewski, R.; Jakubiak, A.; Borowiak-Resterna, A. Co-adsorption and rate of extraction in a copper chloride system containing decanol and hydrophobic pyridine acid derivatives. Solvent Extr. Ion Exch. 2000, 18, 479-492.
28. Tait, B. K.; Shillington, D. P. Effect of isodecanol on amine extraction systems. Solvent Extr. Ion Exch. 1993, 11, 877-887.
29. Delmau, L. H.; Bonnesen, P. V.; Herlinger, A. W.; Chiarizia, R. Aggregation behavior of solvent modifiers for the extraction of cesium from caustic media. Solvent Extr. Ion Exch. 2005, 23, 145-169.
30. Syzamanowski, J. Modifiers in extraction systems. Solvent Extr. Res. Dev. Jpn. 1994, 1, 97-107.
31. Sastre, M.; Szymanowski, J. Discussion of the physicochemical effects of modifiers on the extraction properties of hydroxyoximes: A review. Solvent Extr. Ion Exch. 2004, 22, 737-759.
32. Majdan, M.; Sperline, R. P.; Gu, W.; Yu, W.; Freiser, H. Interaction of long-chain alcohol "modifiers" with LIX solvent extraction reagents. Solvent Extr. Ion Exch. 1989, 7, 987-1005.
33. Keeney, M. E.; Osseo-Asare, K. Molecular interaction in a mixed α-hydroxyoxime-sulfonic acid solvent extraction system. Polyhedron 1982, 1, 453-455.
34. Bogacki, M. B.; Syzamanowski, J. Association of model naphthalene sulfonic acids with modifiers. Solvent Extr. Res. Dev. Jpn. 1995, 2, 36-52.
35. Bogacki, M. B.; Borowiak-Resterna, A.; Syzamanowski, J. Modification of extraction abilities of N,N,N',N'-tetraalkyl-3,5- pyridinedicarboxamide by its association with alcohol. Solvent Extr. Ion Exch. 1997, 15, 591-604.
36. Bogacki, M. B.; Jakubiak, A.; Cote, G.; Syzamanowski, J. Dialkyl pyridinedicarboxylates' extraction ability toward copper (II) from chloride solutions and its modification with alcohols. Ind. Eng. Chem. Res. 1997, 36, 838-845.
37. Syzamanowski, J.; Blondet, I.; Cote, G.; Bauer, D.; Sabot, J.-L. Interfacial activity of dinonylnaphthalene sulphonic acid in the presence of modifiers possessing an hydroxyl group. Hydrometallurgy 1992, 28, 277-296.
38. Syzamanowski, J. Physicochemical modification of extractants. Crit. Rev. Anal. Chem. 1995, 25, 143-194.
39. Duchemin, C. R.; Engle, N. L.; Bonnesen, P. V.; Haverlock, T. J.; Delmau, L. H.; Moyer, B. A. Solvatochromic solvent polarity measurements of alcohol solvent modifiers and correlation with cesium extraction strength. Solvent Extr. Ion Exch. 2001, 19, 1037-1058.
40. Inoue, K.; Tsunomachi, H. Solvent extraction equilibria of copper and nickel with SME529. Hydrometallurgy 1984, 13, 73-87.
41. Wang, X.; Li, W.; Wang, W.; Meng, S.; Li, D. Influence of isooctanol on the interfacial activity and mass transfer of ytterbium (III) using 2-ethylhexylphosphonic acid mono-2-ethylhexyl ester as an acidic extractant. J. Chem. Tech. Biotech. 2009, 84, 268-274.
42. Foulon, C.; Pareau, D.; Durand, G. Thermodynamic and kinetic studies of palladium (II) extraction by extractant mixtures containing LIX 63 Part I. Thermodynamic study. Hydrometallurgy 1999, 51, 139-153.
43. Foulon, C.; Pareau, D.; Stambouli, M.; Durand, G. Thermodynamic and kinetic studies of palladium (II) extraction by extractant mixtures containing LIX 63 Part II. Kinetic study. Hydrometallurgy 1999, 51, 49-63.
44. Al-Bazi, S. J.; Freiser, H. Phase-transfer catalysis in extraction kinetics: Palladium extraction by dioctyl sulfide and Kelex 100. Inorg. Chem. 1989, 28, 417-420.
45. Rúa, M. S.; Almela, A.; Elizalde, M. P. Interactions between components of the extractants LIX 622 and LIX 622N in toluene. Fluid Phase Equilib. 2007, 258, 186-190.
46. Brejza, E. V.; Perez de Ortiz, S. Mechanism of rate enhancement in the extraction of Zn (II) by di(2-ethylhexyl)phosphoric acid in the presence of sodium lauryl sulphate micelles. Colloids Surf. A: Physicochem. Eng. Aspects 2000, 167, 263-274.
47. Choi, S. Y.; Ohashi, K. Large synergism of 3,5-dichlorophenol in the extraction of Gallium (III) with 2-methyl-8-quinolinol derivatives. Anal. Sciences 2000, 16, 169-176.
48. Chagnes, A.; Rager, M. N.; Courtaud, B.; Thiry, J.; Cote, G. Speciation of vanadium (V) extracted from acidic sulfate media by trioctylamine in n-dodecane modified with 1-tridecanol. Hydrometallurgy 2010, 104, 20-24.
49. Prochaska, K. Adsorption of extractants and modifiers in mixed binary systems, Solvent Extr. Ion Exch. 1996, 14, 1057-1075.
50. Prochaska, K.; Staszak, Adsorption at the liquid/liquid interface in mixed systems with hydrophobic extractants and modifiers. 1. Study of equilibrium interfacial tension at the hydrocarbon/water interface in binary mixed systems. J. Colloid Interface Sci. 2005, 285, 1-8.
51. Warren, D. B.; Grieser, F.; Perera, J. M.; Stevens, G. W. An experimental and theoretical study of competitive adsorption at the n-heptane-water interface. Langmuir 2005, 21, 2822-2826.
52. Tao, W.; Glasson, S.; Stevens, G.W.; Perera, J.M. The effect of modifiers on the interfacial tension of P50 at the n-heptane-water interface, (submitted to ISEC 2011).
53. Hanson, C.; Hughes, M. A.; Preston J. S.; Whewell, R. J. The kinetics of the solvent extraction of copper (II) with LIX reagents- IV. The effect of nonylphenol. J. Inorg. Nucl. Chem. 1976, 38, 2306-2307.
54. Delmau, L. H.; Lefranc, T. J.; Bonnesen, P. V.; Bryan, J. C.; Presley, D. J.; Moyer, B. A. Fundamental studies regarding synergism between calix[4]arene-bis-(tert-octylbenzo-crown-6) and alcohol modifiers in the solvent extraction of cesium nitrate. Solvent Extr. Ion Exch. 2005, 23, 23-57.
55. Mathur, J. N. Synergism of trivalent actinides and lanthanides. Solvent Extr. Ion Exch. 1983, 1, 349-412.
56. Eyal, A. M.; Bressler, E.; Bloch, R.; Hazan, B. Extraction of metal salts by mixtures of water-immiscible amines and organic acids (acidbase couple extractants). I. A review of distribution and spectroscopic data and of proposed extraction mechanisms. Ind. Eng. Chem. Res. 1994, 33, 1067-1075.
57. Eyal, A.M.; Kogan, L.; Bressler, E. Extraction of metal salts by mixtures of water-immiscible amines and organic acids (acid-base couple extractants). 2. Theoretical treatment and analysis. Ind. Eng. Chem. Res. 1994, 33, 1076-1086.
58. Chen, J.; Wu, Z. Solvation extraction by amines and synergistic salvation extraction with neutral or acidic extractants. Min. Pro. Ext. Met. Rev. 2000, 21, 49-87.
59. Choppin, G. R. Studies of the synergistic effect. Sep. Sci. Tech. 1981, 16, 1113-1126.
60. Matsubayashi, I.; Hasegawa, Y. Thermodynamic consideration for solvent effects in the synergistic extraction of europium (III) with pivaloytrifluoroacetone and 1,10-phenanthroline. Anal. Sciences 2001, 17, 221-223.
61. Hasegawa, Y.; Nakaya, K.; Matsubayashi, I. Water molecules in organic solvents involved in the synergistic extraction of europium(III) with ß-diketones and Lewis bases. Bull. Chem. Soc. Jpn. 2001, 74, 1879-1883.
62. Hasegawa, Y.; Nakano, T.; Choppin, G. R. Synergistic extraction of europium(III) with benzoic acid and thenoyltrifluoroacetone. Solvent Extr. Ion Exch. 1983, 1, 745-753.
63. Cierpiszewski, R.; Olszanowski, A.; Szymanowski, J. Effect of hydroxyoxime hydrophobicity upon the rate of copper extraction with 2-hydroxy-5-alkylbenzophenone oximes in the presence of α-acyloin oximes. Solvent Extr. Ion Exch. 1994, 12, 571-583.
64. Girgin, S.; Acarkan, N.; Sirkeci, A. A. The uranium(VI) extraction mechanism of D2EHPA_TOPO from a wet process phosphoric acid. J. Radioanal. Nuc. Chem. 2002, 251, 263-271.
65. Preston, J. S.; du Preez, A. C. Synergistic effects in solvent extraction systems based on alkylsalicylic acids. IV. Extraction of the trivalent rare-earth metals in the presence of bifunctional C=O, P=O, and S=O compounds. Solvent Extr. Ion Exch. 1998, 16, 687-706.
66. Banerjee, S.; Bhattacharyya, A.; Mohapatra, P. K.; Basu, S.; Manchanda, V. K. Extraction of the uranyl ion with 3-phenyl-4- acetyl-5-isoxazolone (HPBI) and neutral donors from dilute nitric acid medium. Radiochim. Acta 2003, 91, 729-736.
67. Banerjee, S.; Mohapatra, P. K.; Bhattacharyya, A.; Basu, S.; Manchanda, V. K. Extraction of tetravalent neptunium isoxazolonates as their TOPO adducts. Radiochim. Acta 2004, 92, 95-99.
68. Banerjee, S.; Mohapatra, P. K.; Bhattacharyya, A.; Basu, S.; Manchanda, V. K. Extraction of neptunium(IV) by a mixture of 3-phenyl-4-acetyl-5-isoxazolone and tri-n-octyl phosphine oxide. Radiochim. Acta 2006, 94, 313-317.
69. Meguro, Y.; Kitatsuji, Y.; Kimura, T.; Yoshida, Z. Steric effect of β- diketone in synergistic extraction of actinide(III) and lanthanide(III) with β-diketone + 18-crown-6 ether/1,2-dichloroethane. J. Alloys and Compounds 1998, 271-273, 790-793.
70. Bhattacharyya, A.; Banerjee, S.; Mohapatra, P. K.; Basu, S.; Manchanda, V. K. Extraction of ternary beta-diketonates of uranyl ion using some substituted monoamides. Solvent Extr. Ion Exch. 2003, 21, 687-705.
71. Bhattacharyya, A.; Mohapatra, P. K.; Banerjee, S.; Basu, S.; Manchanda, V. K. Role of ligand structure and basicity on the extraction of uranyl isoxazolonate adducts. Solvent Extr. Ion Exch. 2004, 22, 13-29.
72. Pavithran, R.; Reddy, M. L. P. Steric effects of polymethylene chain of 4-acylbis(pyrazolones) on the solvent extraction of trivalent lanthanoids: synergistic effect with mono and bifunctional neutral organophosphorus extractants. Anal. Chim. Acta 2005, 536, 219-226.
73. Liem, D. H. Studies of the complex formation between di-2- ethylhexyl-phosphate (HDEHP) and tributylphosphate (TBP) or trioctylamine (TOA) in toluene. Acta Chemica Scand. 1972, 26, 191-204.
74. Lumetta, G. J.; Gelis, A. V.; Vandegrift, G. F. Solvent systems combining neutral and acidic extractants for separating trivalent lanthanides from the transuranic elements. Solvent Extr. Ion Exch. 2010, 28, 287-312.
75. Batzar, K.; Goldberg, D. E.; Newman, L. Effect of β-diketone structure on the synergistic extraction of uranyl ion by tributylphosphate. J. Inorg. Nucl. Chem. 1967, 29, 1511-1518.
76. Reddy, K. J.; Kumar, J. R.; Reddy, A. V. Synergistic extraction of zirconium(IV) and hafnium(IV) with 4-acylbis(1- phenyl-3-methylpyrazolones) in the presence of neutral organophosphorus extractants. Solvent Extr. Ion Exch. 2006, 24, 419-432.
77. Wharf, R. H.; Choppin, G. R.; Pruett, D. J. Synergistic solvent extraction of Am(III) and Eu(III) with the soft donor triisobutylphosphine sulfide and thenoyltrifluoroacetone. Solvent Extr. Ion Exch. 1990, 8, 615-627.
78. Preston, J. S.; du Preez, A. C. Synergistic effects in solvent extraction systems based on alkylsalicylic acids. I. Extraction of the trivalent rare-earth metals in the presence of aliphatic amides. Solvent Extr. Ion Exch. 1995, 13, 647-663.
79. Choi, S. Y.; Imura, H.; Ohashi, K. Large extractability of aluminum(III) with 2-methyl-8-quinolinol derivatives in the presence of 3,5-dichlorophenol. Anal. Sciences 2000, 16, 923-928.
80. Meera, R.; Reddy, M. L. P. Para-substituted 1-phenyl-3-methyl-4-(4- fluorobenzoyl)-5-pyrazolones as chelating agents for the synergistic extraction of thorium(IV) and uranium(VI) in the presence of various crown ethers. Solvent Extr. Ion Exch. 2004, 22, 761-789.
81. Remya, P. N.; Pavithran, R.; Reddy, M. L. P. Effect of polymethylene chain length of 4-acylbis(1-phenyl-3-methyl-5-pyrazolones) on the extraction of vanadium(V):synergistic effect with neutral organophosphorus extractants. Solvent Extr. Ion Exch. 2005, 23, 501-518.
82. Diamond, H.; Pan, H. K.; Knapp, G. S.; Horwitz, E. P. The coordination of zinc in the Zn(TTA)2TBP complex in benzene solution using EXAFS. Solvent Extr. Ion Exch. 1983, 1, 515-528.
83. Buch, A.; Stambouli, M.; Pareau, D.; Durand, G. Solvent extraction of nickel(II) by mixtures of 2-ethylhexanal oxime and bis(2- ethylhexyl)phosphoric acid. Solvent Extr. Ion Exch. 2002, 20, 49-66.
84. Tayeb, A.; Goetz-Grandmont, G. J.; Brunette, J. P.; Leroy, M. J. F. Analytical and spectroscopic study of zinc extraction with 1,10- bis(1-phenyl-3-methyl-5-hydroxy-4-pyrazolyl)-1,10-decanedione and tri-n-octylphosphine oxide. Solvent Extr. Ion Exch. 1990, 8, 1-34.
85. Calandra, P.; Ruggirello, A.; Mele, A.; Liveri, V. T. Self-assembly in surfactant-based liquid mixtures: bis(2-ethylhexyl)phosphoric acid/bis(2-ethylhexyl)amine systems. J. Colloid Interface Sci. 2010, 348, 183-188.
86. Tarasov, V. V.; Yagodin, G. A. Interfacial phenomena in solvent extraction. Solvent Extr. Ion Exch. 1988, 10, 141-237.
87. Nitsch, W.; Weigl, M. Action of amphiphilic layers on the kinetics of interfacial reactions at liquid/liquid interfaces. Langmuir 1998, 14, 6709-6715.
88. Syzamanowski, J.; Tondre, C. Kinetics and interfacial phenomena in classical and micellar extraction systems. Solvent Extr. Ion Exch. 1994, 12, 873-905.
89. Miyake, Y.; Takenoshita, Y.; Teramoto, M. Extraction rates of copper with SME529 mechanism and effects of surfactants. Proceedings ISEC '83, Denver, Colorado, USA, 1983; pp 301-302.
90. Harada, M.; Mori, M.; Adachi, M.; Eguchi, W. Kinetics of copper extraction by benzoylacetone. J. Chem. Eng. Jpn. 1983, 16, 193-203.
91. Warren, D. B.; Grieser, F.; Perera, J. M.; Stevens, G. W. The effect of surfactants on the kinetics of nickel (II) extraction by 2-hydroxy-5- nonylacetophenone oxime (LIX84) at the n-heptane/water interface. Langmuir 2006, 22, 213-218.
92. Filik, H.; Apak, R. Modifier and surfactant dependence of gallium extraction by alkanoyl oxinates from basic solutions. Sep. Sci. Tech., 1996, 31, 241-258.
93. Matsumoto, M.; Kondo, K.; Nakashio, F. Effect of anionic surfactant on copper extraction with E-2-hydroxy- 5-nonyl-benzophenoneoxime. J. Chem. Eng. Jpn. 1990, 23, 359-364.
94. Chen, C.; Zhu, T. The kinetics of cobalt (II) extraction with EHEHPA in heptane from acetate system using an improved Lewis cell technique. Solvent Extr. Ion Exch. 1994, 12, 1013-1032.
95. Puvvada, G. V. K. Liquid-liquid extraction of gallium from Bayer process liquor using Kelex 100 in the presence of surfactants, Hydrometallurgy 1999, 52, 9-19.
96. Weigl, M.; Nitsch, W. Kinetics of Mass Transfer and the Different Effects of Surfactants. Proceedings of the International Solvent Extraction Conference (ISEC'99), Barcelona, Spain, 1999; Vol. 2, pp 853-858.
97. Alguacil, F. J.; Caravaca, C.; Cobo, A.; Martinez, S. The extraction of gold (I) from cyanide solutions by the phosphine oxide Cyanex 921, Hydrometallurgy 1994, 35, 41-52.
98. Iberhan, L.; Wisniewski, M. Extraction of arsenic(III) and arsenic(V) with Cyanex 925, Cyanex 301 and their mixtures. Hydrometallurgy 2002, 63, 23-30.
99. Brunette, J. P.; Lakkis, Z.; Lakkis, M.; Leroy, M. J. F. Effect of inorganic aqueous anions on the synergistic extraction of cadmium and zinc with 1-phenyl-3-methyl-4-benzoyl-pyrazal-5-one (HPMBP) and lipophilic ammonium salts. Polyhedron 1985, 4, 577-582.
100. Yang, L.; Michel, T.; Nitsch, W. Effect of auxiliary complexing agents on the kinetics of solvent extraction of metal ions. Solvent Extr. Ion Exch. 1993, 11, 119-141.
101. Belkhouche, N.; Didi, M. A.; Villemin, D. Separation of nickel and copper by solvent extraction using di-2-ethylhexylphosphoric acidbased synergistic mixture. Solvent Extr. Ion Exch. 2005, 23, 677-693.
102. He, W.; Liao, W.; Niu, C.; Li, D. Synergistic extraction of rare earths using acid-base coupling extractants of calyx[4]arene carboxyl derivative and primary amine N1923. Sep. Purificat. Tech. 2008, 62, 674-680.
103. Fu, W.; Chen, Q.; Wu, Q.; Hu, H.; Bai, L. Solvent extraction of zinc from ammoniacal/ammonium chloride solutions by a sterically hindered ß-diketone and its mixture with tri-n-octylphosphine oxide. Hydrometallurgy 2010, 100, 116-121.
104. Kedari, C. S.; Coll, T.; Fortuny, A.; Sastre, A. Third phase formation in the solvent extraction system Ir(IV)-Cyanex 923. Solvent Extr. Ion Exch. 2005, 23, 545-559.
105. SanMartin, M.; Bart, H-J. Recovery of zinc from pickling baths with Amberlite LA-2. Influence of modifier on the extraction equilibrium. Chem. Eng. Technol. 1994, 17, 397-400.