Download or read book Ditopic Reagents for the Solvent Extraction of Platinum Group Metals written by Andrew Matthew Wilson and published by . This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Refining of the Platinum group Metals written by R. I. Edwards and published by . This book was released on 1975 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Solvent Extraction Properties of Di n hexyl Sulphoxide in Relation to the Refining of Platinum group Metals written by and published by . This book was released on 2002 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this paper we describe some aspects of the solvent-extraction chemistry of di-n-hexyl sulphoxide (DnHSO) that are of relevance to the refining of platinum-group metals (PGMs). Although DnHSO is not used as such in the processing of PGMs, it can nevertheless be formed in situ by the oxidation of the parent di-n-hexyl sulphide (DnHS), which is used commercially as an extractant for palladium. The impact of the presence of DnHSO in PGM refining circuits may be favourable or unfavourable. Thus, the strong extraction of ferric iron from hydrochloric acid solutions by DnHSO results in this metal being co-extracted with palladium when DnHS is used in the recovery of the latter metal. Fortunately, however, the iron can be selectively washed out of the loaded organic phase by water, thereby providing a convenient exit from the process for this impurity. On the other hand, dialkyl sulphoxides are also able to extract rhodium from concentrated hydrochloric acid media, apparently by the formation of complexes such as (L2.H3O+)RhCl4L2-, where L = dialkyl sulphoxide. This complex is difficult to strip, and contributes to a gradual build-up of PGM values in the organic phase. Finally, the presence of small quantities of DnHSO in recycled organic solutions of DnHS causes a fortuitous increase in the extraction rate of palladium(II).

Download or read book Solvent Extraction of Platinum Group Metals written by A. F. Thomas and published by . This book was released on 1974 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Selective Solvent Extraction of Palladium by the Use of Di normal hexyl Sulphide written by Hermann Renner and published by . This book was released on 1985 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Improved Process for the Separation and Purification of Platinum Group Metals and Gold written by and published by . This book was released on 1972 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The invention provides a process for the separation and purification of platinum, palladium and/or gold by means of solvent extraction. A high molecular weight tertiary or quaternary amine solvent is used to extract the anionic chloro complexes from the aqueous feed. Any secondary PGM's in the aqueous feed are hydrolysed to complexes which are neutral or cationic. This conditioning is done by boiling 3 to 4 hours below pH 3. The loaded solvent is scrubbed with acid. Palladium and/or gold is stripped with thiourea solution and perchlorite solution is used to strip the platinum but thiocyanate can also be used. Alternatively dilute perchlorite can be used to strip platinum, strong perchlorite for palladium and the gold is then stripped with sodium carbonate solution. Further claims specified the use of resins instead of solvents but no resin details specified. Solvent used most was 5% alamine 336 in solves 150. Other claims included precipitating palladium in strip solution with ethylene and platinum with hydrogen.

Download or read book Solvent Extraction of Platinum group Metals from Hydrochloric Acid Solutions by Dialkyl Sulphoxides written by and published by . This book was released on 2002 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: The solvent extraction of palladium(II), platinum(II), platinum(IV), rhodium(III), iridium(III) and iridium(IV) from hydrochloric acid solutions by some dialkyl sulphoxides of the types R2SO, RR'SO and R'2SO, where R=alkyl and R'=cycloalkyl, was investigated. The order of extraction of these metals by 0.50 M di-n-hexyl sulphoxide in xylene from solutions containing 1 to 6M hydrochloric acid was found to be Pd(II)> Pt(II)> Ir(IV)> Pt(IV)> Rh(III)> Ir(III). Metal-distribution studies suggest that iridium(IV) and platinum(IV) are extracted in the form of ion-pairs such as [formula] and [formula], where L=dialkyl sulphoxide. In the case of palladium(II) and probably platinum(II) also, the sulphoxide apparently displaces one or two of the chloride ligands from the chlorometallate anion [formula], and the distribution data are consistent with the extraction of PdCl2L2 at low hydrochloric acid concentration (1-2 M) and [formula] at higher concentrations (4-6 M). The slow rates of extraction of rhodium(III) and iridium(III) from solutions containing the [formula] species suggests a ligand substitution reaction for these metals also, with the probably formation of species such as [formula] and [formula] in the organic phase. Comparison of the uv-visible spectra of the metal- loaded organic phases with those obtained using tri=n=octylammonium chloride as extractant confirms that simple chlorometallate anions are present in the dialkyl sulphoxide extracts only for platinum(IV) and iridium(IV).

Download or read book Solvent Extraction of the Platinum Metals written by Ellen Davies and published by . This book was released on 1964 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Study of the Use of Thio organic Compounds for the Solvent Extraction and Determination of the Platinum group Metals and Gold written by Andreas Diamantatos and published by . This book was released on 1900 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Extraction and Refining of the Platinum Group Metals written by and published by . This book was released on with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Recovery of Platinum Group Metals and Rhenium from Materials Using Halogen Reagents written by and published by . This book was released on 1996 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Solvent Extraction of the Platinum Metals by Tri n butyl Phosphate written by Terry L. Meek and published by . This book was released on 1970 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Gmelin Handbook of Inorganic Chemistry written by and published by . This book was released on 1985 with total page 343 pages. Available in PDF, EPUB and Kindle. Book excerpt: Like most supplement volumes of the platinum-group metal series,Platinum Suppl. Vol. A 1 has been written by an international team of specialists. It comprises technological data of all six platinum-group metals and their technically relevant alloys and compounds. The volume starts with a review on the recovery of the platinum-group metals (23 pages); the next 42 pages are devoted to processes for separating and refining the PGM in order to obtain metals of high purity. The electrodeposition of the PGM and their alloys is treated on 26 pages.The by far most extensive section deals with PGMand their alloys and compounds in catalysis. After a historicalsurvey and alist of important reviewson PGMcatalysis,the catalytic properties of the metals are treated in a general way, followed by unsupported metals and alloys including preparation of catalysts and their reactions in various industrial processes. The role of supported metals and alloys is described in asimilar manner. This isfollowed byan extensive description of the preparation and the reactions of PGM compounds with various nonmetals and their catalytically active role in a number of industrial processes (226 pages). The last chapter (21 pages) is a compilation of data on the medical use of cytostatic platinum compounds. Gelnhausen, December 1985 Kurt Swars IX Table of Contents Page Technology ofthe Platinum-Group Metals. ............................... 1 1 Review on the Recovery ofthe Platinum-Group Metals . 1.1 Historical Perspective , , , . Period of Discovery, 1750 to 1820 , , . First Industrial Period 1820 to 1900 , , , .

Download or read book The Behaviour and Control of Impurities During the Solvent Extraction of Platinum Metals with an Alkylated 8 hydroxyquinoline written by Vicken Haroutiun Aprahamian and published by . This book was released on 1992 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt: "In order to understand and control the deportment of common impurity elements in the Pt(IV)-Pd(II)-HCl-8-hydroxyquinoline (TN 1911)$ sp{ rm a}$ system, their solvent extraction chemistry in chloride solution has been studied. The investigated elements were Fe(III), Cu(II), Ni(II), Zn(II), Pb(II), Sn(IV), Ag(I), As(V), Sb(V), Bi(III), Se(IV) and Te(IV). Extraction experiments carried out using multi-element and single element feed solutions helped to elucidate the extraction behaviour of the elements with the extractant TN 1911. From the collected data it was deduced that the majority formed anionic chlorocomplexes and extracted via the ion-pair mechanism involving the protonated extractant. Consequently, scrubbing procedures were developed to control the deportment of these elements. These scrubbing steps were then incorporated into a tentative flowsheet which was simulated in a batch-wise fashion in the laboratory. The most contaminating elements were found to be Zn(II), Pb(II), Ag(I), Te(IV), Se(IV) and Bi(III). The first five were effectively scrubbed with 2.0M HCl whereas Bi(III) could only be scrubbed with 2.0M H$ sb2$SO$ sb4$ at A/O ratios of $>$3:1. The element Sn(IV) which was found to build-up in the organic, could only be scrubbed with a 1.0M NaOH solution for long contract times (60 minutes). ftn$ sp{ rm a}$A proprietary alkylated derivative of 8-hydroxyquinoline (Schering Berlin AG)." --

Download or read book Separation and Recovery of Palladium from Platinum and Rhodium by Solvent Extraction written by Kimberly Sue Svalstad and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Metal organic Frameworks for Platinum Group Metal Extraction written by William James Francis Trenholme and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Solvent Extraction Principles and Practice Revised and Expanded written by Jan Rydberg and published by CRC Press. This book was released on 2004-03-03 with total page 1216 pages. Available in PDF, EPUB and Kindle. Book excerpt: A complete and up-to-date presentation of the fundamental theoretical principles and many applications of solvent extraction, this enhanced Solvent Extraction Principles and Practice, Second Edition includes new coverage of the recent developments in solvent extraction processes, the use of solvent extraction in analytical applications and waste re