high temperature cyanide leaching of platinum group metals

  • Cyanide leaching chemistry of platinum group metals

    Previous research by the U.S. Bureau of Mines has shown that autoclave cyanide leaching of used automobiles exhaust catalysts for recovery of platinum group metals (PGM) is technically feasible.

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  • A conceptual flowsheet for heap leaching of platinum group

    In gold leaching such high cyanide concentrations are used when leaching less cyanide soluble gold tellurides and arsenides, and when there is above 0.5% copper in the ore (Adams, 2005, Gupta and Mukherjee, 1990, Marsden and House, 2006).

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  • Welcome to CDC stacks High temperature cyanide leaching

    quot;The U.S. Bureau of Mines investigated leaching automobile catalysts with sodium cyanide (nacn) solutions at high temperatures to recover platinum group metals (PGM). The feed was monolith rejects, used monolith, and used pellet catalysts.

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  • High temperature cyanide leaching of platinum group metals

    Leaching twice with 1 pct sodium cyanide (NaCN) solution at 160 deg. C for 1 h dissolved more than 95 pct of the PGM from catalysts and more than 90 pct from used pellet catalysts. More than 85 pct of the PGM was dissolved from used monolith catalysts when a third autoclave step was added.

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  • leaching process x suppliers south africa

    Feb 04, 20180183;32;High Temperature Cyanide Leaching of Platinum CDC stacks. Effect of NaCN concentration on leaching platinum group metals from monolith . from the Republic of South. Africa 3. Previous Bureau research 4 investigated . 6Reference to specific products does not imply endorsement by the The concentration of free cyanide. 80 .. 0 a. ci

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  • The effect of temperature, cyanide and base metals on the

    The effect of temperature, cyanide and base metals on the adsorption of Pt, Pd and Au onto activated carbon The effect of temperature, cyanide and base metals on the adsorption of Pt, Pd and Au onto

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  • High Temperature Cyanide Leaching of Platinum Group CORE

    Approximately 1,600 kg of used pellet, monolith, and metal support catalysts containing 1,700 g (54 tr oz) of PGM was processed. Forty five kilogram batches of used catalysts were leached with sodium cyanide solution at 160\uc2\ub0C for 1 h in a countercurrent processing sequence.

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  • A new technique for extraction of platinum group metals by

    At room temperature and pressures, the reaction between sodium cyanide and platinum group metals (PGMs) does not occur because of poor kinetics. However, at elevated temperatures between 120 and 180 176;C, PGMs can be leached by sodium cyanide like the reaction of gold.

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  • Leaching and Recovery of Platinum Group Metals From UG 2

    Leaching and recovery of platinum group metals from UG 2 concentrates Optimum conditions for a thiourea/HCl elution were sought by varying thiourea concentration, acid concentration and temperature during batch elution experiments, and results are summarized in Table V.

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  • High temperature cyanide leaching of platinum group metals

    Loading High temperature cyanide leaching of platinum group metals from automobile catalysts process development unit / by R.J. Kuczynski, G.B. Atkinson, and L.A. Walters..

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  • High temperature cyanide leaching of platinum group metals

    Note Citations are based on reference standards. However, formatting rules can vary widely between applications and fields of interest or study. The specific requirements or preferences of your reviewing publisher, classroom teacher, institution or organization should be applied.

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  • ION EX1 Cyanide Platinum Scribd

    Leaching platinum group metals with cyanide, however, is a new concept and process option. The research available is very much limited to the recovery of platinum group metals from recycled automotive catalyst using cyanide8 14.

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  • THE ADSORPTION AND ELUTION OF PLATINUM GROUP

    flotation concentrates are subjected to low temperature calcination followed by cyanide leaching at elevated temperature to dissolve the PGMs, gold, and base metals. These are then recovered from solution by precipitation (Bax, 2004) to produce a high grade PGM and base metal concentrate suitable as direct feed to a refinery.

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  • Cyanide Leaching of Platinum Group Metals

    Later tests showed that autoclave leaching with cyanide at temperatures above 100176; C gave good recovery even from used catalysts. Prereduction with hydrogen was not found to be helpful under these conditions. Another advantage of the higher leach temperature was

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  • The Adsorption and Elution of Platinum Group Metals (Pt

    Various leach approaches have been developed for the alkaline cyanide leaching of platinum group metals (PGMs) from ores, concentrates and from secondary wastes such as

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  • A novel energy efficient process for the extraction of

    chalcopyrite, while the platinum group metals require elevated temperatures to leach at all. As the Platreef resource has very complex mineralogy of PGMs (Mwase et al., 2012), the various minerals are all expected to show different leaching kinetics.

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  • CHM 116 C. 23 Flashcards Quizlet

    E) the use of high temperature processes to make alloys. D) the use of aqueous solutions to extract metals from their ores. An advantage to leaching gold with aqueous solutions of cyanide ion is that

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  • STUDIES ON PLATINUM RECOVERY FROM SOLUTIONS

    during high temperature cyanide leaching from catalysts. The level of platinum recovery obtained by cyanide leaching compared with others hydrometallurgical methods using, for example, aqua regia or hydrochloric acid, which has a recovery of more than 95%, looks too low for a cost effective platinum recovery procedure.

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  • Enrichment of platinum group metals (PGMs) by two stage

    Enrichment of Platinum Group Metals (PGMs) by Two Stage Selective Pressure Leaching Cementation from Low Grade high metal recovery, short process unit operations, low capital invest ment, and SO 1 Cyanide leach residues 1.01 7.3 1.76 7.37 1.78 95.99 99.31

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  • US5160711A Cyanide leaching method for recovering

    If only platinum and rhodium are contained in the catalyst material, and not palladium, the leaching temperature may be as high as 220176; C., but more preferably does not exceed 180176; C. Increasing the leaching temperature will improve dissolution of the platinum group metals until the temperature is reached where the platinum group metal cyanide complexes begin to decompose.

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  • Leaching Platinum Group Metals in a Sulfuric Acid/Chloride

    Leaching Platinum Group Metals in a Sulfuric Acid/Chloride Solution M.H.H. Mahmoud Cyanide pressure leaching was examined for recycling PGM from spent catalysts where substantial care is needed to prevent evolution of the the specified temperature was reached, a 1 g sample of the catalyst losses was

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  • High temperature cyanide leaching of platinum group metals

    High temperature cyanide leaching of platinum group metals from automobile catalysts pilot plant study Author R J Kuczynski ; G B Atkinson ; W J Dolinar ; United States.

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  • HIGH TEMPERATURE CYANIDE LEACHING OF PLATINUM GROUP METALS

    HIGH TEMPERATURE CYANIDE LEACHING OF PLATINUM GROUP METALS FROM AUTOMOBILE CATALYSTS PILOT PLANT STUDY. No abstract provided. Supplemental Notes

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  • High temperature cyanide leaching of platinum group metals

    High temperature cyanide leaching of platinum group metals from automobile catalysts process develop The U.S. Bureau of Mines operated a 2,000 g (4.4 lb) batch process development unit for recovering platinum group metals (PGM) from automobile catalysts.

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  • High Temperature Cyanide Leaching of Platinum Group Metals

    High Temperature Cyanide Leaching of Platium Group Metals From Automobile Catalysts. Bureau of Mines 1992. Report of Investigations RI 9428. Platinum and its sister metals are in high demand and found only in a few deposits around the world. The Auto industry relies heavily on them in the use of Catalytic converters for exhaust systems.

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  • Cyanide Leaching Platinum Catalytic Converter Chemistry

    Dissolution rates increased in the order of Rh, Pt, and Pd, respectively. The U.S. Bureau of Mines has developed a process for the treatment of spent automobile exhaust catalysts for recovery of the platinum group metals (PGM) contained therein (Desmond, et al., 1991; Kuczynski, et

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  • Leaching Platinum Group Metals in a Sulfuric Acid/Chloride

    Leaching Platinum Group Metals in a Sulfuric Acid/Chloride Solution M.H.H. Mahmoud Cyanide pressure leaching was examined for recycling PGM from spent catalysts where substantial care is needed to prevent evolution of the the specified temperature was reached, a 1 g sample of the catalyst losses was

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  • Cyanide Leaching Platinum Catalytic Converter Chemistry

    Previous research by the U.S. Bureau of Mines showed that autoclave cyanide leaching of used automobile exhaust catalysts for recovery of platinum group metals (PGM) was technically feasible. This work involves a more detailed investigation of the chemistry of the dissolution of PGM in cyanide

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  • Leaching and recovery of platinum group metals from UG 2

    of cyanide in these experiments was high, due probably to the high temperature and co leaching of base metals. Reductive roasting followed by cooling under an inert

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  • Leaching and Recovery of Platinum Group Metals From UG 2

    Leaching and recovery of platinum group metals from UG 2 concentrates yields were not good (less than 40 per cent). Platinum leaching was particularly poor with cyanide (ambient temperature).

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  • Welcome to CDC stacks Cyanide leaching chemistry of

    quot;Previous research by the U.S. Bureau of Mines has shown that autoclave cyanide leaching of used automobiles exhaust catalysts for recovery of platinum group metals (PGM) is technically feasible. The purpose of this work was to investigate the chemistry of the dissolution of

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  • Assessing a two stage heap leaching process for Platreef

    the convential concentrate smelt refine process for extracting platinum group metals, thereby adding value to the convential process via economic treatment of low grade materials. Using bench scale columns, a first stage bioleach achieved extractions of 91.1% Cu, 98.5% Ni and 83.5% Co in a space of 88 days at a temperature of 65176;C.

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  • High temperature cyanide leaching of platinum group metals

    High temperature cyanide leaching of platinum group metals from automobile catalysts laboratory tests.

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  • THE ADSORPTION AND ELUTION OF PLATINUM GROUP

    flotation concentrates are subjected to low temperature calcination followed by cyanide leaching at elevated temperature to dissolve the PGMs, gold, and base metals. These are then recovered from solution by precipitation (Bax, 2004) to produce a high grade PGM and base metal concentrate suitable as direct feed to a refinery.

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  • High temperature cyanide leaching of platinum group metals

    Leaching twice with 1 pct sodium cyanide (NaCN) solution at 160 deg. C for 1 h dissolved more than 95 pct of the PGM from catalysts and more than 90 pct from used pellet catalysts. More than 85 pct of the PGM was dissolved from used monolith catalysts when a third autoclave step was added.

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  • Review of Recovery of Platinum Group Metals from Copper

    From this review of PGM leaching and recovery, chloride leaching appears to be the most encouraging route of processing of pressure oxidation residue for the recovery of platinum group metals. For final development of a process flow sheet, a comprehensive mineralogical study needs to be performed on pressure oxidation residue to determine the

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