Provides a unique survey of the information contained in the patent literature concerning solvent extraction of nickel and cobalt. All the available data from the patent documentation is classified systematically for easy retrieval of authors, patents or assignees. Presented in three parts, the first deals with leaching of nickeliferous or cobaltiferous sources using organic reagents; the second reviews the solvent extraction of nickel or cobalt, or both from solutions; the third covers solvent extraction methods used to remove impurities from solutions containing nickel or cobalt. Cites over 300 patent documents.

This book describes and explains the methods by which three related ores and recyclables are made into high purity metals and chemicals, for materials processing. It focuses on present day processes and future developments rather than historical processes. Nickel, cobalt and platinum group metals are key elements for materials processing. They occur together in one book because they (i) map together on the periodic table (ii) occur together in many ores and (iii) are natural partners for further materials processing and materials manufacturing. They all are, for example, important catalysts – with platinum group metals being especially important for reducing car and truck emissions. Stainless steels and CoNiFe airplane engine super alloys are examples of practical usage. The product emphasises a sequential, building-block approach to the subject gained through the author's previous writings (particularly Extractive Metallurgy of Copper in four editions) and extensive experience. Due to the multiple metals involved and because each metal originates in several types of ore – e.g. tropical ores and arctic ores this necessitates a multi-contributor work drawing from multiple networks and both engineering and science. - Synthesizes detailed review of the fundamental chemistry and physics of extractive metallurgy with practical lessons from industrial consultancies at the leading international plants - Discusses Nickel, Cobalt and Platinum Group Metals for the first time in one book - Reviews extraction of multiple metals from the same tropical or arctic ore - Industrial, international and multidisciplinary focus on current standards of production supports best practice use of industrial resources

A series of 26 organophosphorus acids of the dialkyl phosphoric (RO)2POOH, alkyl alkylphosphonic (RO)RPOOH, and dialkylphosphinic acid R2POOH types was prepared for use in studies on the solvent extraction of cobalt, nickel, zinc, copper, calcium, magnesium, and the rare-earth metals. The compounds were characterized by measurement of their physical properties (melting-points, refractive indices, densities, and acid-dissociation constants), and their purities were confirmed by potentiometric titration against standard alkali, by carbon and hydrogen microanalysis and, for liquid products, by comparison of their experimental molar refractivities with empirical values. Metal-distribution equilibria were determined for the extraction of the above-mentioned metals (0,02 M as nitrates) from 0,40 M sodium nitrate solutions into 0,20 M solutions of the organophosphorus acids in toluene at 20 degrees C. For cobalt and nickel, corresponding data were also obtained at 50 degrees C. The application of slope-analysis techniques indicated that the extracted complexes have the stoichiometries Co(HA2)2, Ni(HA2)2(H2O)2, Zn(HA2)2, Cu(HA2)2, Ca(HA2)2(HA)2, Mg(HA2)2(HA)(H2O), and Ln(HA2)3, where H2A2 represents the dimerized organophosphorus acid molecule. Some differences in behaviour were apparent with n-octyl acids, where stoichiometries of NiA2(H2O)2 and LnA3 were found for the nickel and rare-earth (except lanthanum) complexes respectively. The extraction behaviour of the different metals with respect to changes in the structure of the organophosphorus acid is rationalized in terms of the different steric requirements of the respective metal complexes. Correlations between the pH 0,5 values for the extraction of the individual metals and the pKa value of organophosphorus acids provide an indirect estimate of the importance of the contribution of steric factors to the extractability of the metal complexes. The extractants di(3-octyl) and di(4-octyl)phosphinic acid are shown to possess selectivity characteristics superior to those of any previously reported organophosphorus acid with respect to cobalt-nickel, cobalt-calcium, zinc-copper, and zinc-calcium separations. The existence of novel tetrahedral nickel complexes (stoichiometry Ni(HA2)2) with highly sterically hindered phosphinic acids is reported.

Sphalerite concentrates prepared during processing of Missouri lead ores contain small percentages of cobalt and nickel which adversely affect zinc electrolysis. The Bureau of Mines has evaluated solvent extraction and precipitation techniques to remove and recover cobalt and nickel from zinc sulfate solution prior to zinc electrolysis. Prepared zinc sulfate solutions containing about 190 gpl of zinc and 50 ppm of both cobalt and nickel were treated using various combinations of complexing reagents, solvent, pH, concentration, time, and temperature. The following complex reagents gave the best results a-nitroso-ßnaphthol, ß-nitrosos-a-napthol, 1,2 cyclohexane dione dioxime (nioxime), di-2-pyridyl ketone oxime, and dimethglyoxime. These reagents in suitable solvents lowered the cobalt and nickel levels to

This collection presents the papers presented in the symposium on extraction of rare metals as well as rare extraction processing techniques used in metal production. Paper topics include the extraction and processing of elements like antimony, arsenic, gold, indium, palladium, platinum, rare earth metals including yttrium and neodymium, titanium, tungsten, and vanadium. The rare processing techniques covered include direct extraction process for rare earth element recovery; biosorption of precious metals; fluorination behavior of uranium and zirconium mixture of fuel debris treatment; and recovery of valuable components of commodity metals such as zinc, nickel, and metals from slag.