• graphite ore preg robbing recovery of pgms

    Addition of 0.01% w/w of carbon powder into the non-preg-robbing ore decreased gold recovery from 92 to 70% and Soluble gold was analyzed by Graphite Inquire Now; graphite in thin section mineral com. Graphite Wikipedia, the free encyclopedia.

  • Process and mechanism of electrolytic enrichment of PGMs

    The recovery efficiency of PGMs was nearly 100% by electrorefining. (iron ore or metallic iron powders), reducing agent, and slagging agents are added in the furnace. After a period of melting and collecting, almost all PGMs in the spent catalysts can be enriched in the melting iron. The graphite phase hides in the criss-cross gullies

  • Author: Quan Wen, Yunji Ding, Huandong Zheng, Bo Liu, Shengen Zhang
  • Extraction of gold from platinum group metal (PGM) ores

    Jan 01, 2005· The major reefs mined today are the Merensky, UG2 and Platreef, with ore grades ranging from 3 to 8 g/t PGM and with associated nickel and copper in the 0.1–0.2% range present mainly as sulfides. Merensky reef has been the principal source of PGMs, and as demand for rhodium increased from the late 1970s exploitation of the UG2 now accounts

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  • (PDF) Commercial Processes for the Extraction of Platinum

    The current strategy reports the recovery of precious group metals (PGMs) from Na2CO3 roast of Saudi Arabian ophiolitic chromite ore at 1160 °C under atmospheric O2.

  • Recovery of PGMs from an oxide ore by flotation and leaching

    Recovery of PGMs from an oxide ore by flotation and leaching Msc Research Thesis Prepared by: Relebohile Sefako Student number: 1420412 Submitted to: School of Chemical and Metallurgical Engineering, Faculty of Engineering and the Built Environment, University of the Witwatersrand, Johannesburg, South Africa Supervised by: Prof. Vusumuzi Sibanda

  • (PDF) Direct leach approaches to Platinum Group Metal (PGM

    less than 25% PGMs recovery while leaching UG-2 flotation con- centrate, presumably because only 30% of PGM grains were liber- ated and 60% were associated with base metal sulfides, mainly

  • PLASMA SMELTING OF UNCONVENTIONAL ORES AND MINE

    Whilst ‘free milling’ ores typically have recovery levels above 95%, refractory ores have recovery levels significantly below this, with some only achieving 50% to 60% recovery (Vaughan, 2004). Many refractory ores can be subjected to further processing to improve the cyanidation-based recovery rate, but often at greater expense.

  • Leaching and recovery of platinum group metals from UG-2

    from a viewpoint of PGM recovery (target recoveries >95% Pt, >95% Pd, >85% Rh) involved roasting of the ore followed by HCl/chlorine leaching. Since the substrate intended for Mintek’s process was a relatively high grade UG-2 concentrate, it was felt that the use of these harsh conditions, requiring special equipment, could be justified.

  • THE PRIMARY PRODUCTION OF PLATINUM GROUP METALS

    Primary and secondary production of PGMs are comple-mentary and mutually dependent. The PGM industry itself repeatedly recycles PGMs from their applications with recovery efficiencies of up to 95%. It colorates with other stakeholders to increase recycling rates, and this growth of secondary production enables growing demand for PGMs to

  • Platinum is produced in South Africa by Amplats, Impala

    (In addition, the chromite content of UG2 ore is potentially saleable, after recovery of the PGMs, and the removal of gangue.) Pilot-scale tests 22-23 have shown that adequate coalescence of matte prills can be obtained by the use of a higher smelting temperature, and higher power flux (kW/m 2 of furnace hearth area) to increase mixing in the bath.

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  • Leaching and recovery of platinum group metals from UG-2

    from a viewpoint of PGM recovery (target recoveries >95% Pt, >95% Pd, >85% Rh) involved roasting of the ore followed by HCl/chlorine leaching. Since the substrate intended for Mintek’s process was a relatively high grade UG-2 concentrate, it was felt that the use of these harsh conditions, requiring special equipment, could be justified.

  • Highly efficient recovery of platinum, palladium, and

    Apr 01, 2020· PGMs recovery efficiency was 98.94 % and the enrichment factor was 6.62. To reduce the addition of fluxing agents and the consumption of energy, we decreased 5 wt.% of CaO and increased 1.5 wt.% Na 2 B 4 O 7, PGMs recovery efficiency decreased slightly to 98.43 %.

  • Extraction of Platinum Group Metals IntechOpen

    Oct 02, 2017· Platinum group metals (PGMs) are a group of six elements, namely iridium (Ir), osmium (Os), platinum (Pt), palladium (Pd), rhodium (Rh) and ruthenium (Ru) [1, 2].PGMs together with gold and silver are classified as noble or precious metals because of their high corrosion and oxidation resistance [1, 2, 3].The world’s reserves of platinum group metals/elements are estimated at 100 million

  • Extraction of gold from platinum group metal (PGM) ores

    Jan 01, 2005· The major reefs mined today are the Merensky, UG2 and Platreef, with ore grades ranging from 3 to 8 g/t PGM and with associated nickel and copper in the 0.1–0.2% range present mainly as sulfides. Merensky reef has been the principal source of PGMs, and as demand for rhodium increased from the late 1970s exploitation of the UG2 now accounts

  • Commercial Processes for the Extraction of Platinum Group

    Mar 11, 2018· The salient findings on different processes used for recovery of PGMs have been reviewed with respect to various methodologies and objectives. (2012) Development of PGMs and chrome extraction circuit from UG-2 ore. In: Proceedings of the world congress on engineering 3

  • TREATING CHROME TAILINGS FOR PGMs Miningreview

    Aug 19, 2008· Where this has occurred, the recovery of PGMs is lower. However, Marinkovic, who is a chemical engineer, says the oxidised material will still be processed and the response to this issue remains the same, that of blending to ensure the output concentrate grade is within the required range and that the chrome content is below a specified level

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  • Development of PGMs and Chrome Extraction Circuit from

    increased in PGMs recovery from secondary circuit by lower tonnage to the mill, hence more residence time and better grindings. This mine recovers PGMs loss of below 1% recoverable from the chromites. Barplats mine is a PGMs mine located on the Bushveld complex in South Africa, the main ore body is the UG-2 chromitite layer.

  • separation and recovery of pgm from gold slag

    2011-9-10 The higher PGM recovery was also accompanied by higher chrome content as a result of their similar chemical properties. Keywords- Metal sulphides, gangue phases, recoveries, Platinum Group Metals, Bushveld complex I. INTRODUCTION HIS article concentrates on the effect of pH on the recovery and grade of PGMs from UG2 ore by flotation.

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  • THE PRIMARY PRODUCTION OF PLATINUM GROUP METALS

    Primary and secondary production of PGMs are comple-mentary and mutually dependent. The PGM industry itself repeatedly recycles PGMs from their applications with recovery efficiencies of up to 95%. It colorates with other stakeholders to increase recycling rates, and this growth of secondary production enables growing demand for PGMs to

  • [PDF]
  • OVERVIEW OF PGM PROCESSING Anglo American Platinum

    Ore (Merensky/ UG2/Platreef, 3-6 4E g/t) •Composite concentrate (100-500 4E g/t) •Tailings (to tailings dams) •Chromite recovery •Converter matte (>2,800 4E g/t) •Sulphuric acid •Autocatalysts •Jewellery •Other Industrial products (e.g. chemicals, electronics, fuel