Atkinson GB, Kuczynski RJ, Desmond DP (1992) Cyanide leaching method for recovering platinum group metals from a catalytic converter catalyst. U.S. Patent 5,160,711. Google Scholar. Baghalha M, Gh HK, Mortaheb HR (2009) Kinetics of platinum extraction from spent reforming catalysts in aqua-regia solutions. Hydrometallurgy 95: …
Metals with very low reactivity can be found as elements in rocks, such as silver and gold. The metal is visible running through the rock. They do not need to be treated using a chemical reaction ...
platinum mining and extraction methods platinum description and uses Improved separation and refining procedures have become available for all of the precious metals. These commonly involve …
... Once the PGM-containing ore has been mined, concentrated and smelted (removal of Fe and Pb), the refining process …
The PCR enzyme Platinum SuperFi II DNA Polymerase successfully amplified a target region of fish universal primers (MiFish) from trace amounts of eDNA extracted from pumped deep-sea water and suppressed nonspecific amplifications more effectively than the enzyme used in conventional methods.
Data on the precious metal contents obtained by using particular digestion methods as well as UV-VIS spectrophotometry, atomic absorption spectrometry, atomic emission spectrometry and...
The processes of pretreatment, leaching/extraction, and separation/recovery of palladium from the spent catalysts are introduced, and related reaction mechanisms and process flows are given, especially detailed for …
Typical hydrometallurgical processes used for PGM purification are as follows: dissolution-precipitation (pressure oxidation leach), solvent extraction and ion exchange and molecular recognition …
We can use information about their place in an expanded reactivity series to predict the method of extraction. For example, platinum is a less reactive metal than gold. Gold is found as an...
efficiency for the extraction of a specific metal, or group of metals, from aqueous chloride matrices. Different behaviours were obtained towards platinum(IV) and/or palladium(II) extraction, all the N,N'-tetrasubstituted malonamide derivatives allowing the mutual separation of the two metal ions, depending on the HCl concentration.
Placer mining is the method of separating valuable metals from sediments through sifting. Placer mining often takes place in riverbeds, sands and environments where there is a natural accumulation of sediments. …
The traditional method for recovering platinum-group metals (Pt, Pa, Ir, Os, Rh, Ru and Au) is not economically viable in the case of low-grade deposits, but …
platinum mining and extraction methods platinum description and uses Improved separation and refining procedures have become available for all of the precious metals. These commonly involve …
According to the biological methods and with the help of desferrioxamine B, about 30% of platinum has been obtained from the spent catalyst (H [ 13 ]. The refinery reforming catalyst was tested to recover platinum by the bioleaching method. The percentage of platinum recovery by oxalic acid in the bioleaching process increases from 13% to 30%.
... The refining process undergoes a series of dissolution and precipitation stages or total leaching techniques. The solvent extraction process helps to separate the subsequent metals...
Abstract Platinum group metals (PGMs) are considered critical raw materials, thus their recycling and re-use is of outmost importance. Among the PGMs, platinum (Pt), palladium (Pd) and rhodium (Rh) are the basic metals used in catalytic converters. Concerning the stringent EU standards for emission control imposed to car …
When considering the machining of platinum, however, four factors emerge as probable prominent contributors to tool wear. These are: The promotion of a transition reaction, for …
The recovery methods can be physical-mechanical, such as gravitation separation, magnetic separation, electrostatic separation, or separation by eddy currents [21] or chemical methods, such as...
The table displays some metals in decreasing order of reactivity and the methods used to extract them. Metals more reactive than carbon, such as aluminium, are extracted by electrolysis, while...
Learn all about platinum as a precious metal, and the centuries long processes of mining and refining that have made it so integral to many …
Solid-phase extraction methods have also been incorporated into PGM refineries recently, either to compliment or replace solvent extraction methods. Solid-phase extractants have included well established commercial anion-exchange resins such as Amberlite IRA 400, as well as proprietary media such as the Superlig® series of media …
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 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 re source. Development of a suitable extraction technique will contribute to its exploitation.
The liquid–liquid extraction of platinum(II) with 12-, 14- and 16-membered cyclic tetrathioethers from chloride solution was studied. Bromocresol Green ion as a counter anion and 1,2-dichloroethane as an extraction solvent were used. The effect of thiourea on the extraction rate of platinum(II) was examined.
PGM Platinum Mining & Extraction. Platinum-based alloys for high temperature and special applications. Development of alternative techniques for matte level measurements in sulphide smelting furnaces. Keynote Address Seismic method applied to platinum exploration, a success story. Breakeven extraction factors for the Merensky …
In general, platinum metals recoveries increase when the two-stage leaching process is used in a countercurrent mode. During a two-stage leaching process in solutions containing 170 g l −1 HCl, platinum extraction exceeded 99%, while extraction of palladium and platinum metals associates was over 90%.
... The refining process undergoes a series of dissolution and precipitation stages or total leaching techniques. The solvent extraction process helps to separate …
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-group metals located in the United States. Because the ore is sulfidic in nature, it was ...
The fast depletion of critical metals in natural reserves against their increasing demands in advanced technology application presents the necessity to exploit the end-of-life/waste materials as unconventional resources. Due to a higher accumulation of platinum-group metals (PGMs) in exhausted autocatalytic converters, their recycling …