Existing processes for the recovery of platinum group metals (PGM) from UG-2 ores place stringent requirements with regard to chromite content (about 2.8 per cent) upon feed material to the plant. The conventional process sequence involves: smelting of a flotation concentrate to remove gangue material and to produce an iron-nickel-copper-PGM matte

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Nov 27, 2020 As a result, much of the chromite-rich waste, post-PGM extraction, constitutes fine and ultra-fine grains at the sub-60-micron level. Since most of the chromite losses during the conventional washing process occur in this size fraction, industry-wide metallurgical R&D efforts have focused on improving recovery at this particle size

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Extraction of the pure metal from ores is a complex process, and includes milling the ore, a froth floatation process, and smelting at high temperatures. This removes base metals, notably iron and sulfur, and concentrates PGM- platinum group metals- gold, platinum and palladium

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May 24, 2018 Despite a simple minerals processing flowsheet, Tharisa’s ore body mineralogy allows the company to maximise chrome extraction upfront in the process, followed by PGM extraction in the second part of the process, and finally a third pass to extract additional chrome, explains Tharisa mine metallurgical manager Alston Smith, noting that this

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Extraction and refining Extraction, concentration and refining of PGMs require complex, costly and energy-intensive processes that may take up to six months to produce refined metal from the time the first PGM-bearing ore is broken in a mine. 1 Chamber of Mines of South Africa, Annual Report 2012; figure does not include recycling

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The main process technologies for recovery of PGMs are categorized as pyrometallurgical methods, selective chlo-rination processes, and hydrometallurgical methods, such as solvent extraction. Recovery of PGMs by pyrometal-lurgy requires various processes, which take a long time and consume a large amount of energy. In pyrometallurgical

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most sophisticated industrial inorganic chemistry: refining of platinum group metals ore concentrate. pgm ore concentrate The figure below shows a typical assay of a South African platinum group metals ore concentrate obtained as the filter cake after sulfuric acid leach (according to the Sherrit process) of a Merensky reef converter matte

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PROCESS FOR EXTRACTION OF HYDROLIZED COLLAGEN AND CHROME / COLLAGEN COMPLEX OF CHROME-CURRENT LEATHER WASTE . This invention is a process for the extraction of hydrolyzed collagen and chromium / collagen complex from chrome-tanned leather waste where the first process uses Enzyme JOANA F LIX-1H, and Enzyme JOANA F LIX-2H. The second one

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ABSTRACT A process of recovering platinum group metals (PGMs) from a pregnant solution or leachate containing PGM values and base metals, typically a cyanide solution or leachate. A non-selective precipitation of the PGM values and base metals to form an insoluble precipitate comprising the PGM values and base metals is followed by selective leaching of the precipitate

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Outotec also has hydrometallurgical processes available for further treatment and extraction of PGMs, which are also briefly discussed. Introduction The platinum group metals (PGMs) have exceptional physical and chemical properties that have made them indispensable to modern society. Platinum and palladium especially play an

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Nov 15, 2018 Extraction of Pd(II) as a function of HCl or HNO 3 concentration. In hydrometallurgical extraction processes, metal ions are usually leached using very highly concentrated solutions of

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Whenever a system component can process user-supplied data or content from the web, chrome-untrusted:// URLs are used. If you want to block chrome://settings, chrome://os-settings or chrome-untrusted://, use the SystemFeaturesDisableList policy. This blocks all the settings, not just part of it

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recovery of chrome). PGMs are associated with the base metals sulphides and silicates (not chrome). The near-perfect separation of chrome from the PGMs can be achieved because of the chrome removal step within the flotation circuit, the bulk of the fine chromatite particles in . Development of PGMs and Chrome Extraction

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Feb 21, 2018 Processing of PGM involves comminution, flotation, smelting, converting, base metals refinery and precious metals refinery. Due to increasing chrome content in the feed and the challenges associated with operating high chrome feed, alternative routes to smelting of PGM are being investigated. Some hydrometallurgical routes have been proposed

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The material is delivered to site via a newly constructed 10 km overland pipeline that feeds the ore directly into the plant. Once the chrome has been extracted it is delivered to Lonmin’s adjacent concentrator plant for additional PGM extraction. The plant itself is incredibly neat and compact, occupying a very small footprint

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Aug 19, 2008 The process at Millsell involves six stages, the first of which is the obviously the mining that produces the tailings. The mines, in upgrading the chromite content of their ore, produce a tailings stream that contains the majority of the PGMs of the ROM chrome ores. It is these chrome ores with elevated levels of PGMs that are treated

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processed due to the high chrome content in the feed and subsequently in the final concentrate. Very little of the chrome itself exhibits any degree of positive floatability, but when excessive grinding takes place it reports to the final concentrate in the form of entrainment. The chrome occurs in the ore as a chrome spinel with iron oxide and

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PGM grades and ratios of Platinum (vs Palladium) • The UG2 Reef, a chromite-rich reef, is more consistent, but lacks Merensky’s high yield of Gold, Copper and Nickel byproducts. In the last decade, PGM miners recover chromite as a separate product • Platreef is a wider reef with lower PGM values, but higher base metal content (c. 5 times) 5

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Commercial Processes for the Extraction of Platinum Group Metals (PGMs) 123 a mineral phase reconstruction process was proposed to recover PGMs from spent auto-exhaust catalyst [ 72 ]

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