Article Synopsis. A pressure-cycling process has been developed by which hydrogen can be separated from gas mixtures using palladium sponge as an absorbent. At a temperature of 200°C, with pressure cycling between 1 and 35 bar, and a cycle time of 20 seconds, hydrogen of 99.5 per cent purity can be obtained from 75 per cent hydrogen-25 per ...

The separation of isotopes of platinum, as well as palladium, mercury, Lddlum and osmium is a problem of considerable difficulty because of the thermal instability of all known compounds of these elements. For this reason, we have developed an ultrahigh-temperature ion source (Fig. 1) which uses electron bombardment of a ...

Abstract. No definite date can be ascribed to the discovery of platinum; rather it became gradually known to the Western World as a distinct metal of unique properties over a period of two centuries, between 1500 and 1700. The first source to be exploited was the placer deposits in New Granada (now Colombia) where it was initially regarded as a ...

A method of interseparation of platinum from palladium from a feedstock solution in hydrochloric acid, comprising the steps of: (a) adjusting the acidity of the …

The process chemistry is the key to separa- tion (I). It must allow separation of the platinum group metals from the base metals, where the major difference is in complex …

A process for the separation and selective recovery of platinum and palladium values from an acidic aqueous medium which comprises contacting the medium with a mixed organic extraction reagent comprising a water immiscible organic solvent having dissolved therein an organically substituted secondary amine compound capable of forming …

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 ...

PURPOSE:To separate hydrogen by allowing the same to permeate a separation membrane, by forming partial pressure difference in both sides of the separation membrane by sending a gaseous mixture containing hydrogen and helium to the single side of the separation membrane comprising a transient metal or an alloy thereof on a gas pervious …

separation due to erosion; separation due to differential crystallisation of liquid rocks; separation caused by metamorphic processes; Some major mineral deposits of economic importance (such as the Klondyke deposits in Canada) are caused by the first type of process. Some major platinum and related mineral deposits are from similar …

An ion-exchange method for selective separation of palladium, platinum and rhodium from solutions obtained by leaching automotive catalytic converters. Talanta 42, 249–255 (1995).

The separation of platinum from rhodium is more difficult to effect than that of platinum from palladium, but the use of amides leads to much improved results compared with those obtained by the old method using ammonium chloride. Thus, in 50 milliliters of a solution containing 4.95 grams of platinum and 0.55 gram of rhodium, the addition of 3 ...

Among the widely applied techniques, ion exchange with the use of resins becomes one of the most important approaches. This paper reviews the separation of …

JOURNALOFNUCLEARSCIENCEANDTECHNOLOGY 361 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 0 5 10 15 20 25 Air saturation Yield of platinum nanoparticle colloidal solution Nitrogen purge

The first column separation step used cation exchange resin (AG50W-X8) to concentrate PGE-Re and some potential interfering elements (e.g., Mo, Zr and Hf). In the second step, N -benzoyl- N -phenylhydroxylamine (BPHA) extraction resin was used to separate PGE-Re from the remaining interfering elements, which all remained strongly absorbed to ...

Amine-based extractants utilized for platinum extraction and separation from rhodium, but the reported data make known that, marginal separation factors was obtained and reported 9,10. Hence, the ...

of platinum metals are also pr esent, but data on the exact amounts of PGMs given in met-ric tons are rarely available [13,14]. Figure 2 shows the countries with the largest natural resources of PGMs [1,2,11,15]. Figure 2. The locations of the platinum group metals ma in resources by country. (Source: own elab-oration based on literature data ...

At present the final refining stage that produces the individual platinum group metals is carried out by selective precipitation from a solution of mixed platinum group metals, but this is inefficient as far as the degree of separation is concerned. An improved process which makes use of liquid–liquid extraction has been developed to a pilot ...

A simple and selective method was developed for the determination of platinum(IV) with n-octylaniline in toluene. In present study, the use of n-octylaniline in toluene for the extraction of platinum(IV) from ascorbate media was carried out. The effect of various parameters, such as pH, equilibrium time, extractant concentration, and …

The clrolidizing reactions of rhodium, platinum and palladium in the chloridizing process are shown as follows. 2Rh + 3Cl 2 → 2RhCl 3. Pt + 2Cl 2 → PtCl 4. 2Pd+ 3Cl 2 → 2PdCl 3. [0016] A large part of impurity of the raw material is chloridized in the chloridizing process.

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Separation of platinum group metals United States Patent 7354517 Abstract: A process for the chromatographic interseparation of rhodium in admixture with …

A number of runs were performed, all showing excellent separation of the platinum and palladium. In one such run, the column was packed to 300mm height, then 800ml of feedstock liquor was fed to the column at approximately 100g/litre Pt concentration. 6M HCl was then fed to the column at approximately 1.36 litres/minute until Pt was …

A hydrochloric acid solution containing platinum group metals has its acidity adjusted to 5.5 to 6.5M HCl and its redox potential adjusted to at least 500 mV, before being treated by chromatography. Particularly clean separation of at least Pt and Pd can be obtained, and recovered Pt and Pd of at least 99.99% purity may be obtained by following conventional …

A method for determining Au, Pt, Pd, Ir and Rh in ores and silicates and Fe-formation rocks is described. Sample decomposition was carried out with aqua regia and HF, followed by fusion of any insoluble residue with NazOa in a glassycarbon crucible. The precious metals were separated, in 1.2 mol drn-' HCI media, from the matrix elements by …

The separation behavior of Pd(II) and Pt(IV) was compared between Cyanex 301 and LIX 63. Although the separation factor by Cyanex 301 was a little higher than that by LIX 63, LIX 63 was recommended as a suitable extractant for the selective extraction of Pd(II) over Pt(IV) owing to the ease of stripping of Pd(II) from the loaded LIX 63.

Therefore, also extraction from two-component feeds was investigated to verify extraction selectivity of the selected extractants towards Pt(IV) separation. The preliminary results of extraction from the feed containing both palladium(II) and platinum(IV) species in 1 M HCl are presented in Table 9.

US3876747A Separation and purification of iridium. US4131454A Process for recovering silver and gold from chloride solutions. US6290749B1 Preparation of ultra-pure silver metal. US3922330A Separation and purification of platinum group metals and gold.

What is claimed is: 1. A process for mutual separation of platinum group metals (PGM) from a raw material which also contains impurity elements, comprising the following steps: (1) first step, wherein the raw material containing PGM is leached in the presence of an oxidant while being suspended in a hydrochloric acid solution to prepare …

The process chemistry is the key to separation . It must allow separation of the platinum group metals from the base metals, where the major difference is in complex formation, …

Abstract A novel ionic liquid (IL) functionalized with thiodiglycol amic acid containing a soft S donor was synthesized for the effective and efficient extraction of platinum group metals (Ru, Rh, and Pd) from aqueous nitric acid solutions, such as high-level radioactive liquid waste (HLLW). The IL enabled rapid extraction of Pd(II) with an …