(PDF) Direct leach approaches to Platinum Group Metal (PGM ...

Direct leach approaches to Platinum Group Metal (PGM) ores and concentrates: A review. July 2015. Minerals Engineering 78. DOI: 10.1016/j.mineng.2015.04.015. Project: Leach processes of a complex ...

Read more

Impact of platinum group metals (Ru, Pd, Rh) on the ...

1 Impact of Platinum Group Metals (Ru, Pd, Rh) on the dissolution of UO 2 Théo Cordara 1,2, Solène Bertolotto 1, Laurent Claparede 1, Stéphanie Szenknect 1, Adel Mesbah 1, Renaud Podor 1, Claire Lavalette 3, Nicolas Dacheux 1 * 1 ICSM, CEA, CNRS, ENSCM, Univ Montpellier, Site de Marcoule, Bât. 426, BP 17171, 30207 Bagnols-sur-Cèze, France 2 NucleUS Immobilisation Science Laboratory ...

Read more

Platinum Group Metals and Compounds - Renner - - Major ...

Abstract The article contains sections titled: 1. History 2. Properties 3. Occurrence 3.1. Abundance 3.2. Ores and Their Origin 3.3. Primary Deposits 3.4. Secondary ...

Read more

Sustainable Platinum Recycling through Electrochemical ...

Dissolve and recover: Platinum group metals (PGMs) recycling is of great strategic importance. In this work, a recycling oriented Pt nanoparticle electrochemical dissolution protocol is described. In this work, a recycling oriented Pt nanoparticle electrochemical dissolution …

Read more

Dissolution of noble metals in highly concentrated acidic ...

Highly concentrated solutions of AlCl 3 ·6H 2 O and Al(NO 3) 3 ·9H 2 O were investigated for Au and platinum group metals dissolution. 95% Pd was leached from spent automotive catalysts in 15 min at 80 °C, while Pt required longer times; Rh dissolution was <20%. Au dissolution from wires required 24 h. Pd recovery was investigated by reductive precipitation.

Read more

Dissolution of noble metals in highly concentrated acidic ...

Abstract. Highly concentrated solutions of AlCl 3 ·6H 2 O and Al(NO 3) 3 ·9H 2 O were investigated for Au and platinum group metals dissolution. 95% Pd was leached from spent automotive catalysts in 15 min at 80 °C, while Pt required longer times; Rh dissolution was <20%. Au dissolution from wires required 24 h. Pd recovery was investigated by reductive precipitation.

Read more

Enhanced Dissolution of Platinum Group Metals Using ...

OSTI.GOV Journal Article: Enhanced Dissolution of Platinum Group Metals Using Electroless Iron Deposition Pretreatment

Read more

Dissolution of noble metals in highly concentrated acidic ...

Highly concentrated solutions of AlCl3·6H2O and Al(NO3)3·9H2O were investigated for Au and platinum group metals dissolution. 95% Pd was leached from spent automotive catalysts in 15 min at 80 °C, while Pt required longer times; Rh dissolution was <20%. Au dissolution from wires required 24 h. Pd recovery wa

Read more

Cathodically Dissolved Platinum Resulting from the O ...

determine if the platinum dissolution resulted in an ionic species or as metal nanoparticles coming off of the surface. Hydroxyl radicals formed as a result from the ORR were the species implicated in causing the platinum dissolution but little was done to shed light on the true oxidizing species responsible for the phenomenon.

Read more

Platinum group - Wikipedia

The platinum-group metals (abbreviated as the PGMs; alternatively, the platinoids, platinides, platidises, platinum group, platinum metals, platinum family or platinum-group elements (PGEs)) are six noble, precious metallic elements clustered together in the periodic table.These elements are all transition metals in the d-block (groups 8, 9, and 10, periods 5 and 6).

Read more

US5304359A - Dissolution of platinum group metals from ...

A method is provided for the dissolution of at least one precious metal selected from the group consisting of platinum group metals, gold and silver. The method comprises subjecting a material containing at least one of the precious metals to dissolution with a sulfuric acid solution maintained at a pH at least sufficient to complex the precious metal with bromide ions in the presence of an ...

Read more

Minerals | Free Full-Text | The Fate of Platinum-Group ...

Diverse studies were performed in order to investigate the behavior of the platinum-group minerals (PGM) in the weathering cycle in the Bushveld Complex of South Africa and the Great Dyke of Zimbabwe. Samples were obtained underground, from core, in surface outcrops, and from alluvial sediments in rivers draining the intrusions. The investigations applied conventional mineralogical …

Read more

Recovery platinum group metals from oxides ores - BHP ...

Dissolution of platinum group metals with a cyanide solution, e.g., sodium cyanide solution, is relative easy, particularly the dissolution of PGM's in their elemental state to form cyano-complexes that are stable in aqueous solutions. However, if PGM's exist in mineral form, such as in oxide ores, it may be necessary to liberate the precious ...

Read more

INVESTIGATION OFTHELEACHING OF THEPLATINUM- GROUP …

The dissolution of platinum-group metals (PGMs) requires a high chloride ion concentration inanacidic solution andasuitable oxidant. AtImpala Platinum Refinery, the concentrate is leached in a hydrochloric acid solution using chlorine gas as the oxidant. The goal ofthisleaching stepisatotal dissolution ofthePGMs and gold.

Read more

US4188362A - Process for the treatment of platinum group ...

A process for the dissolution of precious metal values in a concentrate thereof wherein the concentrate is caused to alloy with aluminum and the alloy is then leached in at least two steps, the first of which is to remove base metals and in the second of which the precious metals are dissolved using hydrochloric acid and chlorine gas or nitric acid as an oxidant.

Read more

Potential mobilization of platinum-group elements by ...

The emission of platinum-group elements (PGEs) from catalytic converters has led to increased environmental abundances of Pt, Pd, and Rh; however, little is known about the environmental effects and fate of these metals. Organic ligands found in soils have the potential to increase the mobility of P …

Read more

Recovery of platinum group metals from secondary materials ...

Read "Recovery of platinum group metals from secondary materials. I. Palladium dissolution in iodide solutions, Journal of Applied Electrochemistry" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.

Read more

Extraction and Refining of the Platinum Metals | Johnson ...

The platinum group metals, together with some gold, total about fifty ounces to the ton. The complete process of extraction consists essentially of enriching this matte to approximately 65 per cent content of platinum metals and then treating this concentrate with acids to separate the individual platinum group metals from each other, followed ...

Read more

Recovery of platinum group metals from secondary materials ...

Platinum Group Metals (PGMs), often with associated gold, have very few occurrences where they are present in an ore deposit at economically extractable levels. ... Platinum black dissolution ...

Read more

Dissolution of platinum group metals from materials ...

The present invention is particularly applicable to the dissolution of platinum group metals contained in a wide variety of materials preparatory to recovery of said metals by known methods. Examples of such materials include ores containing platinum group metals, gold ores, silver ores, metallurgical intermediates, such as mattes and ...

Read more

Impact of platinum group metals (Ru, Pd, Rh) on the ...

The effect of metallic particles containing Platinum Group Metal (PGM) elements on the dissolution of sintered UO 2 samples was examined through the development of multiparametric dissolution tests on sintered UO 2 and UO 2 + 3 mol.% PGM samples. This effect was found to be more important for C HNO3 < 1 mol L −1 whereas it was lowered for higher nitric acid concentrations due to …

Read more

Platinum Group Metals Ltd. (PLG) Waits On The Launchpad ...

Platinum Group Metals Ltd. (AMEX:PLG) price on Friday, October 29, fall -3.77% below its previous day's close as a downside momentum from buyers pushed the stock's value to $2.30. A look at the stock's price movement, the close in the last trading session was $2.39, moving within a …

Read more

Separating the Platinum Group Metals by Liquid–Liquid ...

The platinum group metals platinum, palladium, rhodium, iridium, osmium and ruthenium together with silver and gold generally occur in nature associated with the major base metals iron, copper, nickel and cobalt and a wide range of minor elements such as lead, tellurium, selenium and arsenic, and both technical and commercial considerations demand that the individual platinum group metals be ...

Read more

THE RECOVERY OF PLATINUM, PALLADIUM, AND GOLD …

Leaching platinum group metals with cyanide, however, is a new concept and process option. ... at ambient conditions, and follow kinetics similar to those described by gold dissolution into cyanide media to form the aurocyanide, Au(CN)2-, complex in solution15, 20. Platinum and

Read more

Zn-vapor pretreatment for acid leaching of platinum group ...

To recover platinum group metals (PGMs) from spent automotive catalytic converters with a smaller environmental load, a Zn-vapor treatment prior to acid leaching was previously proposed. Because PGMs and Zn form alloys which dissolve easily, the pretreatment is believed to reduce the use of both chemical agents and processing time.

Read more

Precious Metal Refining

Also, platinum group metals are retained in a chloride solution. As a general rule, the Miller-Wohlwill process compares economically with aqua regia refining only for large throughputs. Small-scale refiners inevitably opt for dissolution due to lower …

Read more

DETERMINATION OF LEACHING PARAMETERS FOR THE …

The potential range where the dissolution of Pd starts is relatively low and, hence, there are a variety of possible oxidizers to be used in the actual leaching process. For the leaching of platinum and rhodium the choice of an oxidizer is much more critical, as relatively high potential is needed for economic operation. Barakat et al. (2006)

Read more

Platinum Dissolution in Realistic Fuel Cell Catalyst ...

Platinum Dissolution in Realistic Fuel Cell Catalyst Layers. Konrad Ehelebe, Corresponding Author. ... (PEMFC) with Pt-group metal (PGM) ... Another possible explanation could be that dissolved platinum species are stabilized in micro-cracks within the ionomer of the catalyst layer, ...

Read more

Electrochemical dissolution of metals of the platinum ...

12%The electrochemical dissolution of metals of the platinum group in acid solutions using an alternating current is investigated. It is shown that this is an efficient and promising method for the production of pure noble metal salts, and for the analysis and extraction of small amounts of noble metals from waste and poor ores.

Read more

About Platinum - Gold and silver mines

The separation chemistry of the platinum-group metals is among the most complex and challenging of metal separations. A brief description of procedures for isolating the platinum-group metals is set forth below, followed by descriptions of assaying and scrap-refining techniques. Individual solubilization

Read more

Platinum Group Metals in Catalytic Converters - Materials ...

There are between 3-7 grams of platinum group metals in a standard catalytic converter, but the amount varies based on manufacturer and model. In terms of the extent to which they are used, there are generally around 3 to 7 grams of PGMs in a standard catalytic converter. However, the amount varies depending on the size of the unit.

Read more

Tailored High-Performance Low-Platinum-Group-Metal …

platinum group metal elements required for efficient catalysis in the PEMFC. Therefore, PGM content must be ... dissolution to determine how the catalyst surface is transforming under catalytic conditions [4]. This information fuels the development of real-world nanoscale catalysts that are synthesized in gram-scale batches

Read more

A SIMPLE METHOD FOR THE DISSOLUTION OF PLATINUM …

In order to develop a new method for efficiently recovering platinum group metals (PGMs) from catalyst scraps, the authors investigated an efficient dissolution process where the material was pretreated by electroless Fe deposition. When Rh-loaded alumina powder was kept in aqua regia at 313 K (40 °C) for 30 to 60 minutes, the Rh hardly dissolved.

Read more

Method for the selective extraction of platinum group ...

The method of extracting platinum group metals from copper and Nickel anode slimes, including the dissolution of anode sludge and electrolyte secretion metals from solution, characterized in that the dissolution of anode sludge is carried out by treatment with nitric acid and electrolytic selection of the metal produced by potentiostatic ...

Read more

Reactions between Some Alkali and Platinum Group Metals ...

The present knowledge of reactions between the alkali metals, lithium, sodium, potassium and rubidium with the platinum group metals, platinum, palladium, rhodium, iridium, osmium and ruthenium, their reaction products, and the relevant binary phase diagrams, is surveyed. Information is included on the magnetic and electrical behaviour of some alloys, especially those with the higher platinum ...

Read more

Enhanced Dissolution of Platinum Group Metals Using ...

In order to develop a new method for efficiently recovering platinum group metals (PGMs) from catalyst scraps, the authors investigated an efficient dissolution process where the material was pretreated by electroless Fe deposition. When Rh-loaded alumina powder was kept in aqua regia at 313 K (40 °C) for 30 to 60 minutes, the Rh hardly dissolved.

Read more

Recovery of platinum group metals from secondary materials ...

12%Platinum and palladium are predicted to form stable solution species in halide and ammoniacal solutions. (b) The use of ammonia as complexant for the dissolution appears inappropriate, as oxidation of the ammonia passivated the palladium surface with adsorbed atomic nitrogen species. (c)

Read more

Microwave digestion methods for preparation of platinum ...

The platinum group elements (PGE) are currently receiving worldwide attention as an attractive exploration target because they are precious metals with many ... advantages of microwave dissolution include shorter heating times that result from the high temperatures and pressures attained inside the sealed containers. The use of

Read more

Dissolution behaviour of platinum group metals into molten ...

(2014). Dissolution behaviour of platinum group metals into molten slags. Mineral Processing and Extractive Metallurgy: Vol. 123, Metals and Materials Processing in a Clean Environment: Part II, …

Read more