Synergistic solvent extraction of nickel and cobalt: A review of recent developments

Solvent Extraction and Ion Exchange

Volumn 29, Issue 5-6, 2011, Pages 719-754

  Cheng, Chu Yong ^a   Barnard, Keith R ^a   Zhang, Wensheng ^a   Robinson, David J ^a  

^a CSIRO   (Australia)

Author keywords

Cobalt; Nickel; Purification; Separation; Synergistic solvent extraction

Indexed keywords

RESEARCH SUBJECTS; SYNERGISTIC SOLVENT EXTRACTION; SYNERGISTIC SYSTEMS;

CALCIUM; COBALT; INDUSTRIAL APPLICATIONS; MAGNESIUM; MANGANESE; NICKEL; PURIFICATION; SEPARATION; SOLVENTS;

SOLVENT EXTRACTION;

EID: 80053604569     PISSN: 07366299     EISSN: 15322262     Source Type: Journal    
DOI: 10.1080/07366299.2011.595636     Document Type: Article

References (106)

1. Flett, D.S. New reagents or new ways with old reagents. J. Chem. Technol. Biotechnol. 1999, 74, 99-105.
2. Duyckaerts, G.; Desreux, J.F. Recent Development and New Combinations of Extractants in Synergic Process. In Proceedings International Solvent Extraction Conference ISEC 1977; Lucas, B.H., Ritcey, G.M., Smith, H.W., Eds.; Canadian Institute of Mining and Metallurgy: Montreal, 1979; CIM Special Vol. 21, pp 73-85.
3. Flett, D.S. Chemistry of Nickel-Cobalt Separation. In Extractive Metallurgy of Nickel, Critical Reports on Applied Chemistry; Burkin, A.R., Ed.; Society of Chemical Industry, John Wiley & Sons: London, 1987; Vol. 17, pp 76-96.
4. Flett, D.S. Cobalt-nickel separation in hydrometallurgy: A review. Chem. Sustain. Dev. 2004, 12, 81-91.
5. Ritcey, G.M. Processes. In Solvent Extraction: Principles and Application to Process Metallurgy; Revised 2nd ed.; G.M. Ritcey and Associates: Ottawa, 2006; Vol. 2, pp 356-359.
6. Ritcey, G.M. Theory and Practice. In Solvent Extraction: Principles and Application to Process Metallurgy; Revised 2nd ed.; G.M. Ritcey and Associates: Ottawa, 2006; Vol. 1, pp 56-57.
7. ® 63/Carboxylic Acid Mixtures. In Proceedings International Solvent Extraction Conference ISEC 1971; Gregory, J.G., Evans, B., Weston, P.C., Eds.; Society of Chemical Industry: London, 1971; Vol. 1, pp 214-223.
8. Flett, D.S.; Titmuss, S. Synergistic effect of LIX 63 on the extraction of copper and cobalt by naphthenic acid. J. Inorg. Nucl. Chem. 1968, 31, 2162-2163.
9. Flett, D.S.; Cox, M.; Heels, J.D. Extraction of Nickel by α-Hydroxyoxime/Lauric Acid Mixtures. In Proceedings International Solvent Extraction Conference ISEC 1974; Jeffreys, G.V., Ed.; Society of Chemical Industry: London, 1974; Vol. 3, pp 2560-2575.
10. Nyman, B.G.; Hummelstedt, L. Use of Liquid Cation Exchange for Separation of Nickel(II) and Cobalt(II) with Simultaneous Concentration of Nickel Sulphate. In Proceedings International Solvent Extraction Conference ISEC 1974; Jeffreys, G.V., Ed.; Society of Chemical Industry: London, 1974; pp 669-684.
11. Fekete, S.O., Meyer, G.A.; Wicker, G.R. The Selective Extraction of Nickel and Cobalt from Acid Leach Solutions using a Mixed Solvent System. In Proceedings 1977 Annual Meeting AIME; AIME: New York; 1977; Paper A77-95.
12. Joe, E.G.; Ritcey, G.M.; Ashbrook, A.W. Uranium and copper extraction by liquid ion exchange. JOM 1966, 1, 18-21.
13. Ashbrook, A.W., Ritcey, G.M.; Joe, E.G. Mixer extractant and process for separating copper from cobalt and nickel in acid medium. 1969; US Patent No. 3,455,680.
14. de Schepper, A.; van Peteghem, A. Process for liquid-liquid extraction of cobalt from nickel. 1978; US Patent No. 4,088,733.
15. Preston, J.S. Solvent extraction of nickel and cobalt by mixtures of carboxylic acids and non-chelating oximes. Hydrometallurgy 1983, 11, 105-124.
16. Preston, J.S. The Solvent Extraction of Base Metals by Mixtures of Carboxylic Acids and Non-Chelating Oximes. Mintek Report No M234; Council for Mineral Technology: Randburg, 1985.
17. Preston, J.S. Recent development in the separation of nickel and cobalt from sulphate solutions by solvent extraction. J. S. Afr. Inst. Min. Metall. 1983, 83 (6), 126-132.
18. Preston, J.S. Selective solvent extraction using organophosphorus acids and carboxylic acids. 1982; UK Patent No. 2109357A.
19. Preston, J.S. Non-Chelating Oximes in the Solvent Extraction of Base Metals. In Proceedings International Solvent Extraction Conference, ISEC 1983; AIME: New York, 1983; pp 357-358.
20. Preston, J.S. Solvent extraction of cobalt and nickel by organophosphorus acids 1. Comparison of phosphoric, phosphonic and phosphonic acid systems. Hydrometallurgy 1982, 9, 115-133.
21. Preston, J.S. Solvent extraction of base metals by mixtures of organophosphoric acids and non-chelating oximes. Hydrometallurgy 1983, 10, 187-204.
22. Preston, J.S.; Fleming, C.A. The Recovery of Nickel by Solvent Extraction from Acidic Sulphate Solutions. In Hydrometallurgy: Research, Development and Plant Practice; Osseo-Asare, K., Miller, J.D., Eds.; Metallurgical Society of AIME: Warrendale, PA, 1982; pp 475-489.
23. Cole, P.M. Bench-Scale Tests on the Extraction of Cobalt and Nickel from Comat Leach Liquors. Mintek Report No M176D, Council for Mineral Technology: Randburg, 1984.
24. nd International Conference of Mining and Metallurgy of Complex Ni Ores, Jingchuan, China, 1993; pp 274-279.
25. Zhang, P.; Inoue, K.; Tsuyama, H. Recovery of metal values from spent hydrodesulfurization catalysts by liquid-liquid extraction. Energy Fuels 1995, 9 (2), 231-239.
26. Inoue, K.; Zhang, P.W.; Tsuyama, H. Recovery of Rare Metals from Spent Hydrodesulfurization Catalysts by Means of Solvent Extraction. In Proceedings International Solvent Extraction Conference ISEC 1996; Shallcross, D.C., Paimin, R., Prvcic, L.M., Eds.; University of Melbourne: Melbourne, 1996; pp 745-750.
27. Inoue, K.; Zhang, P.; Koga, Y.; Eguchi, H. Development of Synergistic Solvent Extraction System for the Recovery of Nickel and Cobalt from Spent Hydrodesulfurization Catalysts. In Hydrometallurgy and Refining of Nickel and Cobalt, Nickel-Cobalt 97 International Symposium; Cooper, W.C., Mihaylov, I., Eds.; Canadian Institute of Mining, Metallurgy and Petroleum: Montreal, 1997; pp 221-233.
28. Elizalde, M.P., Cox, M., Aguilar, M. Synergistic extraction of Ni(II) by mixtures of LIX 63 and bis(2-ethylhexyl)phosphoric or di-noctylphosphinic acids in toluene. Solvent Extr. Ion Exch. 1996, 14 (5), 833-848.
29. Barnard, K.R., Urbani, M.D. The effect of organic acids on LIX 63 stability under harsh strip conditions and isolation of a diketone degradation product. Hydrometallurgy 2007, 89, 40-51.
30. Osseo-Asare, K.; Keeney, M.E. Aspects of the interfacial chemistry of nickel extraction with LIX 63-HDNNS mixtures. Met. Trans. B: Proc. Metall. 1980, 11B, 63-67.
31. Osseo-Asare, K.; Keeney, M.E. Sulfonic acids: Catalysts for the liquid-liquid extraction of metals. Sep. Sci. Tech. 1980, 15, 999-1011.
32. Osseo-Asare, K.; Leaver, H.; Laferty, J.M. Extraction of Nickel and Cobalt from Acidic Solutions using LIX 63-DNNS Mixtures. In Process and Fundamental Considerations of Selected Hydrometallurgical Systems; Kuhn, M.C., Ed.; AIME: New York, 1981; pp 195-207.
33. Osseo-Asare, K.; Renninger, D.R. Synergistic extraction of nickel and cobalt by LIX 63-dinonylnaphthalene sulphonic acid mixtures. Hydrometallurgy 1984, 13, 45-62.
34. Zheng, Y.; Osseo-Asare, K. The selectivity of nickel over iron in the LIX 63-HDNNS solvent extraction system. Solvent Extr. Ion Exch. 1985, 3 (6), 825-837.
35. Osseo-Asare, K. and Zheng, Y. Synergism, Antagonism and Selectivity in the LIX 63-HDNNS Metal Extraction System. In Proceedings International Solvent Extraction Conference ISEC 1986; DECHEMA: Frankfurt am Main, 1986; Vol. 2, pp 175-178.
36. Grinstead, R.R. Extractant Systems for Nickel and Cobalt based on Organic Sulphonates. In Proceedings International Solvent Extraction Conference, ISEC 1980; Article 80, Liege, 1980; Vol. 3, p 170.
37. Grinstead, R.R. Extraction of copper, nickel and cobalt using alky-laromatic sulphonic acids and chelating amines. 1981; US Patent No. 4,254,087.
38. Grinstead, R.R. Metallurgical extractant system. 1983; US Patent No. 4,382,872-A.
39. Grinstead, R.R.; Tsang, A.L. A Selective Metallurgical Extractant System to Recover Nickel and Cobalt from Acid Solutions. In Proceedings International Solvent Extraction Conference ISEC 1983; AIME: New York, 1983; pp 230-231.
40. Inoue, K.; Koga, Y.; Yoshizuka, K.; Owatari, K.; Tsuyama, H. Recovery of nickel and/or cobalt from aluminium-containing aqueous solution. 1997; JP Patent No. 09194965.
41. Koga, O.; Ohto, K.; Yoshizuka, K.; Inoue, K.; Tsuyama, H. Separation of Nickel and Cobalt from Aluminium by Extraction with Mixture of DNNSA/Picolylamine. In Proceedings of Symposium on Solvent Extraction; Japanese Association of Solvent Extraction: Fukuoka, 1995; pp 83-84.
42. Zhou, T.; Pesic, B. A pyridine-based chelating solvent extraction system for selective extraction of nickel and cobalt. Hydrometallurgy 1997, 46, 37-53.
43. Preston, J.S.; du Preez, A.C. Solvent extraction of nickel from acidic solutions using synergistic mixtures containing pyridinecarboxylate esters. Part 1. Systems based on organophosphorus acids. J. Chem. Technol. Biotechnol. 1996, 66, 86-94.
44. Preston, J.S.; du Preez, A.C. Synergistic effect in the solvent extraction of some divalent metals by mixtures of Versatic 10 and pyridinecarboxylate esters. J. Chem. Technol. Biotechnol. 1994, 61, 159-165.
45. Preston, J.S.; du Preez, A.C. Solvent extraction of nickel from acidic solutions using synergistic mixtures containing pyridinecarboxylate esters. Part 2. Systems based on alkylsalicylic acids. J. Chem. Technol. Biotechnol. 1996, 66, 293-299.
46. Preston, J.S.; du Preez, A.C. Solvent extraction of nickel from acidic solutions using synergistic mixtures containing pyridinecarboxylate esters. Part 3. Systems based on arylsulphonic acids. J. Chem. Technol. Biotechnol. 1998, 71, 43-50.
47. Cole, P.M.; Nagel, V.M. The upgrading and purification of nickel by solvent extraction. In Proceedings Extraction Metallurgy Africa 1997; South African Institute of Mining and Metallurgy: Johannesburg, 1997.
48. Preston, J.S., du Preez, A.C. Synergistic effects in solvent-extraction systems based on alkysalicylic acids. Part 2. Extraction of nickel, cobalt, cadmium and zinc in the presence of some neutral N-, O- and S-donor compounds. Solvent Extr. Ion Exch. 1996, 14 (2), 179-201.
49. Preston, J.S.; du Preez, A.C. The solvent extraction of nickel and cobalt by mixtures of carboxylic acids and pyridinecarboxylate esters. Solvent Extr. Ion Exch. 1995, 13, 465-494.
50. Bao, F.Y.; Fang, J.; Zhu, D.H.; He, P.J. Extraction of nickel and purification of cobalt electrolyte. I. Properties of synergistic extraction of nickel by naphthetic acid and 1-octyl-3-pyridinecarboxylate. Nonferr. Met. 1999, 51 (1), 44-46 (in Chinese).
51. Bao, F.Y.; Zhu, D.H.; Fang, J.; He, P.J. Extraction of nickel and purification of cobalt electrolyte. II. Purification of cobalt electrolyte by solvent extraction. Nonferr. Met. 1999, 51 (2), 36-38 (in Chinese).
52. Zhang, P.; Yokoyama, T.; Suzuki, T. M.; Inoue, K. The synergistic extraction of nickel and cobalt with a mixture of di(2-ethylhexyl)phosphoricscid and 5-dodecylsalicylaldoxime. Hydrometallurgy 2001, 61, 223-227.
53. Cerpa, A.; Alguacil, F.J. Separation of cobalt and nickel from acidic sulphate solutions using mixtures of di(2-ethylhexyl)phosphoric acid (DP-8R) and hydroxyoxime (ACORGA M5640). J Chem. Technol. Biotechnol. 2004, 79, 455-460.
54. Tanaka, M.; Maruyama, M.; Sato, Y. Solvent extraction recovery of nickel from spent electroless nickel plating baths using mixtures of organo-phosphorus acids and hydroxyoximes. Solvent Extr. Res. Dev. Japan 2003, 10, 51-63.
55. Andrade, F.; Elizalde, M.P. Synergistic extraction of Ni(II) by mixtures of LIX 860 and bis(2-ethylhexyl) phosphoric acid. Solvent Extr. Ion Exch. 2005, 23 (1), 85-99.
56. Cheng, C.Y.; Urbani, M.D. Synergistic solvent extraction process. 2005; PCT Patent No. 2005/001452.
57. Cheng, C.Y.; Rodriguez, M. Upgrading Cobalt Product using Synergistic Solvent Extraction Technology at Murrin Murrin Operation of Minara Resources. In Proceedings ALTA 2006 Nickel/Cobalt; ALTA Metallurgical Services: Melbourne, 2006.
58. Cheng, C.Y.; Zhang, W.; Rodriguez, M. Separation of Copper, Iron and Zinc from Cobalt and Nickel in Minara Process Liquor by Synergistic Solvent Extraction: Pilot Plant Operation. In Proceedings ALTA 2007 Nickel/Cobalt; ALTA Metallurgical Services: Melbourne, 2007.
59. Zhang, W.; Cheng, C.Y.; Rodriguez, M.; Pranolo, Y. Separation of Copper, Iron and Zinc from Cobalt and Nickel with Mixed CYANEX 272 and LIX 84 Extractants. In Proceedings International Solvent Extraction Conference ISEC 2008; Moyer, B.A., Ed., Canadian Institute of Mining, Metallurgy and Petroleum: Montreal, 2008; Vol. 1, pp 177-182.
60. Cheng, C.Y.; Urbani, M.D. Solvent extraction process for separation of cobalt and/or manganese from impurities in leach solutions. 2005; WO Patent Publication No. 2005/073415 A1.
61. Cheng, C.Y. Solvent extraction of nickel and cobalt with synergistic systems consisting of carboxylic acid and aliphatic hydroxyoxime. Hydrometallurgy, 2006, 84, 109-117.
62. Barnard, K.R.; Nealon, G.L.; Ogden, M.I.; Skelton, B.W. Crystallographic determination of three Ni-α-hydroxyoximecarboxylic acid synergist complexes. Solvent Extr. Ion Exch. 2010, 28, 778-792.
63. Cheng, C.Y.; Zhang, W.; Pranolo, Y. Recovery of Cobalt and Zinc from Boleo Leach Solutions using the CSIRO DSX Process. In Proceedings ALTA2007Nickel/Cobalt; ALTA Metallurgical Services: Melbourne, 2007.
64. Cheng, C.Y.; Zhang, W.; Pranolo, Y. Recovery of Cobalt and Zinc from Boleo Leach Solutions using the CSIRO DSX Process. In Proceedings International Solvent Extraction Conference ISEC 2008; Moyer, B.A., Ed.; Canadian Institute of Mining, Metallurgy and Petroleum: Montreal, 2008; Vol. 1, pp 163-168.
65. Cheng, C.Y.; Zhang, W.; Pranolo, Y. Separation of cobalt and zinc from manganese, magnesium and calcium using synergistic solvent extraction system consisting of Versatic 10 and LIX 63. Solvent Extr. Ion Exch. 28, 604-624.
66. Dreisinger, D.; Cheng, C.Y.; Zhang, W.; Pranolo, Y. Development of Boleo Process Flowsheet and its Direct Solvent Extraction (DSX) Circuit. In Proceedings XXV International Mineral Processing Congress, IMPC 2010; Australasian Institute of Mining and Metallurgy: Victoria, 2010; pp 309-317.
67. Anon., News release of Baja Mining Corp, September 8, 2010; www.bajamining.com.
68. Jones, D.; Mayhew, K.; McCoy, T.; Cheng, C.Y.; Barnard, K.R.; Zhang, W. A Process to Separate Cobalt from Nickel. In Proceedings ALTA 2010 Nickel/Cobalt/Copper; ALTA Metallurgical Services: Melbourne, 2010.
69. Jones, D.L.; McCoy, T.; Mayhew, K.; Cheng, C.Y.; Barnard, K.R.; Zhang, W. Solvent extraction process for separating cobalt from nickel in aqueous solution. 2010; US Patent Application No. 12/784,037.
70. Mayhew, K.; McCoy, T.; Jones, D.; Barnard, K.R.; Cheng, C.Y.; Zhang, W.; Robinson, D. Kinetic separation of Co from Ni, Mg, Mn and Ca via synergistic solvent extraction. Solvent Extr. Ion Exch. 2011.29(5-6), XX-XX.
71. Cheng, C.Y.; Urbani, M.D. Solvent extraction process for separation of cobalt and/or nickel from impurities in leach solutions. 2005; WO Patent No. 2005/073416 A1.
72. Zhang, W.; Narendranathan, R.; Cheng, C.Y.; Pranolo, Y. Interfacial Tension and Nickel Stripping Kinetics with Versatic 10 and LIX 63 Synergistic Systems. In Proceedings International Solvent Extraction Conference ISEC 2008; Moyer, B.A., Ed.; Canadian Institute of Mining, Metallurgy and Petroleum: Montreal, 2008; Vol. 1, pp 183-188.
73. Cheng, C.Y.; Boddy, G.; Zhang, W.; Godfrey, M.; Robinson, D.J.; Pranolo, Y.; Zhu, Z.; Zeng L.; Wang, W. Direct Solvent Extraction for Recovery of Nickel and Cobalt from Rio Tinto Laterite Leach Solutions. In Proceedings Hydrometallurgy of Nickel and Cobalt 2009; Budac, J.J., Fraser, R., Mihaylov, I., Papangelakis, V.G., Robinson, D.J., Eds.; Canadian Institute of Mining, Metallurgy and Petroleum: Montreal, 2009; pp 243-254.
74. Cheng, C.Y.; Boddy, G.; Zhang, W.; Godfrey, M.; Robinson, D.J.; Pranolo, Y.; Zhu, Z.; Wang, W. Recovery of nickel and cobalt from laterite leach solutions using direct solvent extraction: Part 1: Selection of a synergistic SX system. Hydrometallurgy 2010, 104, 45-52.
75. Cheng, C.Y.; Boddy, G.; Zhang, W.; Godfrey, M.; Robinson, D.J.; Pranolo, Y.; Zhu, Z.; Zeng, L.; Wang, W. Recovery of nickel and cobalt from laterite leach solutions using direct solvent extraction: Part 2 Semiand fully continuous tests. Hydrometallurgy 2010, 104, 53-60.
76. Preston, J.S.; du Preez, A.C. Separation of nickel and calcium by solvent extraction using mixtures of carboxylic acids and alkylpyridines. Hydrometallurgy 2000, 58, 239-250.
77. Nagel, V.M.; Feather, A. The recovery of nickel and cobalt from a bioleach liquor saturated in calcium using Versatic acid in a synergistic mixture with 4-nonylpyridine. In Proceedings ALTA 2010 Nickel/Cobalt/Copper; ALTA Metallurgical Services: Melbourne, 2010.
78. Cheng, C.Y. Separation of nickel from calcium by synergistic solvent extraction. In Proceedings ALTA SX/IX-1; ALTA Metallurgical Services: Melbourne, 2000.
79. Cheng, C.Y.; Davies, M.G. Separation of Nickel from Calcium Using Synergistic Solvent Extraction. In Proceedings International Symposium Solvent Extraction; Bhubaneswar, India, 2002; pp 71-88.
80. Cheng, C.Y.; Urbani, M.; Houchin, M. Synergistic Solvent Extraction and its Potential Application to Nickel and Cobalt ecovery. In Proceedings Hydrometallurgy 2003 Fifth International Conference in Honour of Professor Ian Ritchie; Young, C., Alfantazi, A., Anderson, C., James, A., Dreisinger, D., Harris, B., Eds.; The Minerals, Metals and Materials Society: Warrendale, PA, 2003; Vol. 1, pp 787-798.
81. Cheng, C.Y.; Urbani, M.D. Purification of Laterite Leach Solutions by Direct Solvent Extraction. In Proceedings Yazawa International Symposium Metallurgical and Materials Processing: Principals and Technologies; The Minerals, Metals and Materials Society: Warrendale, PA, 2003; Vol. 3, pp 251-265.
82. Cheng, C.Y. SX Application for Nickel and Cobalt: Pros and Cons of Existing Processes and Possible Future Development. In Proceedings ALTA SX/IX World Summit; ALTA Metallurgical Services: Melbourne, 2003.
83. Cheng, C.Y.; Urbani, M.D.; Houchin, M. Manganese Separation by Solvent Extraction in Nickel Laterite Processing. In Proceedings International Laterite Nickel Symposium 2004; The Minerals, Metals and Materials Society: Warrendale, PA, 2004; pp 429-447.
84. Cheng, C.Y.; Urbani, M.D. The Recovery of Nickel and Cobalt from Leach Solutions by Solvent Extraction: Process Overview Recent Research and Development. In Proceedings of the International Solvent Extraction Conference ISEC 2005; Chinese Academy of Science: Beijing, 2005; pp 503-526.
85. rd International Mineral Processing Conference; Neset, G.Ö.; Mehmet, A.; Çelik, S., Eds.; Promed Advertising Ltd: Istanbul, 2006; pp 1463-1468.
86. Cheng, C.Y; Zhang, W.; Moradkhani, D. The Recovery of Metals from Leach Solutions by Synergistic Solvent Extraction. In Proceedings HydroProcess 2006; Domic, E.M., Casas de Prada, J. M., Eds.; Impresos Socias Ltda: Santiago, 2006; pp 3-16.
87. Du Preez, A.C.; Preston, J.S. Separation of nickel and cobalt from calcium, magnesium and manganese by solvent extraction with synergistic mixtures of carboxylic acids. J. S. Afr. Inst. Min. Metall. 2004, 104 (7), 333-338.
88. TM synergistic system for nickel-calcium separation. J. S. Afr. Inst. Min. Metall. 2007, 107, 633-640.
89. Cheng, C.Y.; Zhu, Z.; Zhang, W. A DSX Process to Recover Copper, Nickel, Cobalt and Zinc from Chloride Solutions by Synergistic Solvent Extraction. In Proceedings ALTA Copper; ALTA Metallurgical Services: Melbourne, 2009.
90. Zhu, Z.; Cheng, C.Y.; Zhang, W. A Novel Synergistic Solvent Extraction System to Recover Zinc, Cobalt and Nickel from Chloride Solutions. In Proceedings International Solvent Extraction Conference ISEC 2011; Gecamin: Santiago. (In press.)
91. Cheng, C.Y.; Barnard, K.R.; Davies, M.G. A study on the chemical stability of the Versatic 10-Acorga CLX50 synergistic system. Miner. Eng. 2002, 15, 1151-1161.
92. Barnard, K.R.; Davies, M.G.; Cheng, C.Y. Stability of the Versatic 10-Decyl-4-pyridinecarboxylate system under continuous SX conditions: Chemical analysis and phase disengagement studies. Hydrometallurgy 2004, 74, 47-56.
93. ® 65N and Dowfax 2AO interaction in copper solvent extraction and electrolysis. Can. Metall. Q. 1976, 15, 383-388.
94. Swanson, R.R. Liquid Ion Exchange: Organic Molecules for Dydrometallurgy. In Proceedings International Solvent Extraction Conference ISEC 1977; Lucas, B.H., Ritcey, G.M., Smith, H.W., Eds.; Canadian Institute of Mining and Metallurgy: Montreal, 1979; CIM Special Vol. 21, pp 3-8.
95. Whewell, R.J.; Foakes, H.J.; Hughes, M.A. Degradation in hydroxyoxime solvent extraction systems. Hydrometallurgy 1981, 7, 7-26.
96. Preston, J.S. The selective solvent extraction of cadmium by mixtures of carboxylic acids and trialkylphosphine sulphides. Part 1. The origin and scope of the synergistic effect. Hydrometallurgy 1994, 36, 61-78.
97. ® 63 stability in the presence of Versatic 10 under proposed commercial extract and strip conditions Part I: Operation at high temperature. Hydrometallurgy 2008, 91, 1-10.
98. ® 63 stability in the presence of Versatic 10 under proposed commercial extract and strip conditions Part II: Oxime isomer inter-conversion and the effect of oxime degradation products on selected physical properties. Hydrometallurgy 2008, 91, 11-19.
99. ◦C. Hydrometallurgy 2010, 104, 268-277.
100. ® 63 Oxime and Versatic 10 Part II: The El Boleo Case Study. In Proceedings International Solvent Extraction Conference ISEC 2008; Moyer, B.A. Ed.; Canadian Institute of Mining, Metallurgy and Petroleum: Montreal, 2008; Vol. 1, pp 119-124.
101. ® 63 Oxime and Versatic 10 Part III: Nickel Laterite Case Study. In Proceedings International Solvent Extraction Conference ISEC 2008; Moyer, B.A. Ed.; Canadian Institute of Mining, Metallurgy and Petroleum: Montreal, 2008; Vol. 1, pp 125-130.
102. ® 63/Versatic 10 Synergistic Solvent Extraction System. In Proceedings ALTA 2010; ALTA Metallurgical Services: Melbourne, 2010.
103. Cheng, C.Y.; Boddy, G.; Zhang, W.; Godfrey, M.; Barnard, K.R.; Robinson, D.J.; Pranolo, Y.; Zhu, Z.; Zeng, L.; Wang, W.; Shiers, D., Turner, N.L.; Hill, T.N. Separation of Nickel and Cobalt from Manganese, Magnesium and Calcium by Synergistic Solvent Extraction - from Batch Tests to Pilot Plant Operation. In Proceedings International Mineral Processing Congress 2010; Australasian Institute of Mining and Metallurgy: Victoria, 2010; pp 285-297.
104. Yeo, W.J.A.; Wyche, J.; Holmes, M.; Norton, E.; Hunter, D.; Ross, T.; Britton, S.; Bosworth, G. El Boleo Project Feasibility Study Summary Report; Baja Mining Corp. Report 43-101, 2007. http://www.bajamining.com/boleo/dfs_update/.
105. ® 63 degradation product 5,8-diethyl-6,7-dodecandione monooxime (keto-oxime) and 5,8-diethyl-6,7-dodecanediol (diol) and regeneration of oxime from keto-oxime. Hydrometallurgy 2008, 90, 147-153
106. ® 63 Oxime and Versatic 10 Part I: Oxime Degradation Products and Oxime Isomer Analysis. In Proceedings International Solvent Extraction Conference ISEC 2008; Moyer, B.A., Ed.; Canadian Institute of Mining, Metallurgy and Petroleum: Montreal, 2008; Vol. 1, pp 113-118.