Selective Recovery of Platinum Group Metals and Rare Earth Metals from Complex Matrices Using a Green Chemistry/Molecular Recognition Technology Approach Steven R. Izatt, IBC Advanced Technologies, Inc., American Fork, UT, 84003 USA
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اقرأ أكثرFrom Table III it can be seen that high recoveries of gold (>80 per cent), platinum (>98 per cent) and palladium (>99 per cent), were obtained with Dowex 21K XLT, Amberjet 4600, and Amberlite PWA-5. Minix showed moderate recoveries for platinum and palladium (72 per cent and 61 per cent respectively), with a high recovery of gold (>95 per cent).
اقرأ أكثرPlatinum recovery from spent reforming and isomerization catalysts has been studied by selective dissolution of base metals in 50% H 2 SO 4 and treating the insoluble residue with aqua regia from which platinum was recovered (Jeliyaskova et al., 1982). Platinum was also recovered from a spent Pt-aluminosilicate catalyst by slurrying in sulfuric ...
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اقرأ أكثرIn the flotation of platinum group minerals (PGMs) it has generally been assumed that they will behave similarly to base metal sulfides and thus sulfide reagent regimes are generally used in such flotation plants. However the tellurides and arsenides of platinum and palladium contribute about 50% of the PGMs present in the Platreef ore, located in the northern limb of the Bushveld Complex of ...
اقرأ أكثرThe Bureau of Mines devised a procedure for selectively extracting platinum-group metals (PGM) and gold from Stillwater Complex flotation concentrate. The Stillwater Complex is the only major U.S. PGM resource. Development of a suitable extraction technique will contribute to its exploitation. The concentrate was roasted at 1,050 deg. C to convert host base-metal sulfides to oxides and the PGM f
اقرأ أكثرrhodium recycled mainly from spent auto-catal ysts. As it is known, meta llic layer on ceramic. carrier contains, in average, 1.5 g of Pt and Pd and 0.3 g of Rh pe r autocatalyst. Th is is why the ...
اقرأ أكثرSynopsis. As part of its strategic and critical minerals program, the U.S. Bureau of Mines investigated methods for beneficiating and recovering platinum-group metals (PGM) from ores found in the Stillwater Complex, the only primary resource of platinum-group metals located in the United States.
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اقرأ أكثر"The Bureau of Mines devised a procedure for selectively extracting platinum-group metals (PGM) and gold from Stillwater Complex flotation concentrate. The Stillwater Complex is the only major U.S. PGM resource. Development of a suitable extraction technique will contribute to its exploitation.
اقرأ أكثر12%Published studies dealing with the process mineralogy of Pt mines on the Bushveld Complex is generally limited to the Western Bushveld. The recognition by mine management that another resource, in addition to the Upper Group 2 (UG2) reef currently being mined at the Two Rivers platinum mine (TRP), is urgently required in order to extend the life of mine, …
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اقرأ أكثرPublished studies dealing with the process mineralogy of Pt mines on the Bushveld Complex is generally limited to the Western Bushveld. The recognition by mine management that another resource, in addition to the Upper Group 2 (UG2) reef currently being mined at the Two Rivers platinum mine (TRP), is urgently required in order to extend the life of mine, presented an opportunity to conduct ...
اقرأ أكثر12%Synopsis. As part of its strategic and critical minerals program, the U.S. Bureau of Mines investigated methods for beneficiating and recovering platinum-group metals (PGM) from ores found in the Stillwater Complex, the only primary resource of platinum …
اقرأ أكثرSelective Recovery of Platinum Group Metals and Rare Earth Metals from Complex Matrices Using a Green Chemistry/Molecular Recognition Technology Approach Steven R. Izatt IBC Advanced Technologies, Inc., American Fork, UT, 84003 USA
اقرأ أكثرPLATINUM Disclaimer: ... prices, mineral resource exploration and development capabilities, recovery rates and other operational capabilities, the availability of mining and processing equipment, the ... South Africa is located in the Bushveld Complex in three regions commonly referred to as the Western, Eastern, and Northern Limbs ...
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اقرأ أكثرThe dissolution and subsequent selective recovery of elements from complex mixtures naturally necessitates redox chemistry. The majority of processes involve hydrometallurgical dissolution followed by selective chemical precipitation or electrochemical winning. The atom and energy efficiencies of these proce Elemental Recovery and Sustainability
اقرأ أكثرThe residue is then leached with a solution comprising sulfuric acid and NaOCl or H 2 O 2 to extract platinum, palladium, copper and gold. US4337226A - Recovery of platinum-group metals from ores - Google Patents Recovery of platinum-group metals from ores Download PDF Info Publication number US4337226A. US4337226A US06 ...
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اقرأ أكثرPerhaps, one of the greatest challenges in the gold mining industry is to produce high grade concentrates consistently at maximum recovery from the mineralized deposit. To quantify recovery is a reasonable idea of the initial ore required to have an economical operation. In this part, a reliable sampling representing the ore is a key aspect.
اقرأ أكثرPlatinum group, six metals, in order of increasing atomic weight, ruthenium (Ru), rhodium (Rh), palladium (Pd), osmium (Os), iridium (Ir), and platinum (Pt). The elements all possess a silvery white colour—except osmium, which is bluish white. The chemical behaviour of these metals is paradoxical in that they are highly resistant to attack by most chemical reagents yet, employed as catalysts ...
اقرأ أكثرPLATINUM DEPOSITS IN THE BUSHVELD COMPLEX S.A. HIEMSTRA Natianal Institute tor Metallurgy, Prtvate Bag X3015, Ratrdburg 2125, Soutlt Alrica INTRoDUcTIoN Most of the sulfide occu,rrences of the Bushveld complex are associated with enriclr-ments in platinum-group metals. However, there are only three known occurrences where the
اقرأ أكثرincreased PGM recovery. Pre-roasting of UG-2 in air (at temperatures greater than 800°C) converted PGM sulphides to oxide phases and native metals and alloys2. HCl/chlorine leaching gave much improved recoveries of platinum (Pt), palladium (Pd), and rhodium (Rh): Pt (96 per cent), Pd (79 per cent), Rh (28 per cent).
اقرأ أكثرPlatinum-Group Metals—World Supply and Demand By David R. Wilburn and Donald I. Bleiwas U.S. Geological Survey Open-File Report 2004-1224 U.S. Department of the Interior U.S. Geological Survey
اقرأ أكثرWhen nuclear fuel is irradiated in a power reactor a wide range of chemical elements is created by the fission of uranium and plutonium. These fission products include palladium, rhodium and ruthenium, and could in principle constitute a valuable source of these three metals. Their separation front the fuel during reprocessing operations is, however, a complex mutter.
اقرأ أكثرThe larger the platinum content in the sample, the longer the leaching time that was needed, but it did not affect the leaching rate (Supplementary Fig. 10c,f). Recovery of PMs
اقرأ أكثرThe 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).
اقرأ أكثرUnlike gold and silver, which could be readily isolated in a comparatively pure state by simple fire refining, the platinum metals require complex aqueous chemical processing for their isolation ...
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اقرأ أكثرThe complex process for refining platinum. Image from UNCTAD. A platinum flotation circuit. In a process called flotation separation, air bubbles are blown through the mixture and carry platinum particles to the surface of the bath. The platinum-rich froth is skimmed from the bath and allowed to dry into a concentrated powder.
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اقرأ أكثرrecovery of platinum, palladium, and gold from stillwater complex flot ation concentrate by a roasting·leaching procedure by e. g. bdglin, 1 j. m. gomes, 2 t. g. carnahan,2and j. m. snider3 abstract
اقرأ أكثرThe recovery of the individual platinum metals from the natural alloys is a complex process that depends upon the distinct properties of the individual elements, even though all members of the group are generally similar in their chemical behavior and are quite unreactive.
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اقرأ أكثرThe best efficiency for platinum and palladium recovery at optimum leaching conditions were 91.94%, and 98.82%, respectively. Keywords: Aqua regia, catalytic converter, PGMs, Platinum, Palladium ...
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اقرأ أكثرThe dissolved Pt was recovered using an anion exchange resin. The resin on which the platinum complex is adsorbed is dried and burned in an oxidizing atmosphere at 800–850 °C. The recovered metallic powder is mainly platinum.
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