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  • US Patent Application for PROCESS FOR ACIDIC

    A process for recovery of one or more elements, selected from precious metals and chalcophile metals as herein defined, from materials containing precious and/or chalcophile metal/s, said process including: (i) a leaching step comprising contacting the material with an acidic solution containing a lixiviant comprising an aqueous amino acid-thiourea compound formed from an amino acid (as herein ...

  • Process for leaching of precious metals - Degussa ...

    1994-8-9  A process is disclosed for the leaching of gold and silver from ores and ore concentrates through intimate contact of the ore or ore concentrate with an aqueous leach solution containing cyanide. The leach solution has a pH of 8 to 13. The leaching process takes place in the presence of an oxygen-releasing peroxo compound.

  • US5336474A - Process for leaching of precious metals ...

    A process is disclosed for the leaching of gold and silver from ores and ore concentrates through intimate contact of the ore or ore concentrate with an aqueous leach solution containing cyanide. The leach solution has a pH of 8 to 13. The leaching process takes place in the presence of an oxygen-releasing peroxo compound. The separation of the formed cyano complexes of gold and silver takes ...

  • Hydrometallurgical process for the recovery of yttrium ...

    2020-7-10  The leaching process using waste fluorescent powder was performed by dividing the experiment in two steps to investigate the effect of different operating conditions. In the first stage, the focus was to identify acids and stirring rate suitable for the leaching of the waste fluorescent powder, while in Step 2, the experiment was carried out by ...

  • US8388730B2 - Process of leaching gold - Google

    A process of leaching gold comprising the steps of: a) leaching copper from copper sulfide ore material that contains gold or contains silicate ore containing gold until the copper grade is reduced to 7.9 wt % or less; b) mixing the resulting material having a copper grade of 7.9 wt % or less with a gold leaching solution selected from the group consisting of a first solution containing ...

  • Double alkali process for removal of sulfur dioxide

    An improved double alkali process is disclosed which is useful for the removal of sulfur dioxide from gas streams, especially waste gas streams derived from coal-fired plants which also contain entrained fine particles of ash which contain alkali, which process comprises leaching soluble alkali from said entrained fine particles to establish an aqueous alkali scrubbing solution, scrubbing the ...

  • US Patent for Leaching cobalt, molybdenum, nickel,

    Another leaching process is disclosed in Chemical Abstracts, 94: 178649x. A spent catalyst, containing aluminum, vanadium, nickel, cobalt, and molybdenum, was leached with ammonia and ammonium salts, at a temperature greater than 110.degree. C. and an oxygen partial pressure of greater than 1 kg/cm.sup.2, for more than 1/2 hour.

  • DST's CLEVR Process(TM) Achieves 95% Gold Extraction

    The direct CLEVR Process leaching, without any pre-treatment, was successful and demonstrated higher gold extraction yields (>90%) when compared with cyanidation (67.6%) tests conducted on the same material. DST's standard CLEVR Process conditions were utilised, which allowed for superior gold yields in a fraction of the time (1-hour leaching ...

  • Bioleaching of trace elements and rare earth elements

    Coal fly ash originated from coal combustion has high concentrations of metals. If suitable leaching techniques are identified, then coal fly ash could serve as a useful source of valuable minerals including rare earth elements (REEs). In this study, three microbial strains, Candida bombicola, Phanerochaete chrysosporium and Cryptococcus curvatus were tested on their performance of leaching ...

  • leaching - Traduction en français - exemples anglais ...

    Disclosed is a method for heap leaching an ore containing chalcopyrite. La présente invention concerne un procédé de lixiviation en tas d'un minerais contenant de la chalcopyrite. Sulphide leaching is subsequently conducted on the carbonate-depleted host.

  • Hydrometallurgical process for the recovery of yttrium ...

    2020-7-10  The leaching process using waste fluorescent powder was performed by dividing the experiment in two steps to investigate the effect of different operating conditions. In the first stage, the focus was to identify acids and stirring rate suitable for the leaching of the waste fluorescent powder, while in Step 2, the experiment was carried out by ...

  • Double alkali process for removal of sulfur dioxide

    An improved double alkali process is disclosed which is useful for the removal of sulfur dioxide from gas streams, especially waste gas streams derived from coal-fired plants which also contain entrained fine particles of ash which contain alkali, which process comprises leaching soluble alkali from said entrained fine particles to establish an aqueous alkali scrubbing solution, scrubbing the ...

  • Process Leaching Provide - phumlani-lodge.co.za

    Leaching process in the preparation ... and also provide the lowest cost per unit mass ... Leaching process in the preparation of Raney cobalt catalyst 165 123. ... Patent US6168766 Process for leaching Disclosed is a process for leaching copper from copper sulfide using bacteria, which ensures that the rate of leaching of copper increases ...

  • IMPROVING PROCESS CONTROLS AT IN-SITU LEACHING

    2014-8-5  IMPROVING PROCESS CONTROLS AT IN-SITU LEACHING URANIUM MINES Natalya Bokovoya1, Biays Bowerman2, Michael Browne3, Colin Carroll2, Sean Dunlop4, A. Kasabekov1, Karen Miller3, Scott Purvis5, Gulnara Yeligbayeva6 1 NAC Kazatomprom JSC Astana, Kazakhstan 2 Brookhaven National Laboratory Upton, NY USA 3Los Alamos National Laboratory Los Alamos, NM,

  • gold leaching process

    The process design of gold leaching and carboninpulp circuits 14 JANUARY/FEBRUARY 1999 The Journal of The South African Institute of Mining and Metallurgy. Get Price; Patent US5336474 Process for leaching of A process is disclosed for the leaching of gold and silver from ores and ore concentrates through intimate contact of the ore or ore ...

  • A carbon nanotube-confined iron modified cathode with ...

    2019-10-29  It was confirmed that the CNT cavities could provide an isolated space for Fe0, and the iron leaching mass was only 3.21 × 10−3 mg cm−2, even at pH 3. Consequently, different mechanisms for phenol degradation via heterogeneous EF reactions on Fe0-in-CNT and Fe0-out-CNT cathodes were disclosed.

  • Bioleaching of trace elements and rare earth elements

    Coal fly ash originated from coal combustion has high concentrations of metals. If suitable leaching techniques are identified, then coal fly ash could serve as a useful source of valuable minerals including rare earth elements (REEs). In this study, three microbial strains, Candida bombicola, Phanerochaete chrysosporium and Cryptococcus curvatus were tested on their performance of leaching ...

  • (PDF) The recovery of nickel and cobalt from leach ...

    PDF On Jan 1, 2005, C.Y. Cheng and others published The recovery of nickel and cobalt from leach solutions by solvent extraction: Process overview, recent research and development Find, read ...

  • thiosulfate gold leaching - micheldeegens.nl

    Thiosulfate leaching offers a number of benefits related to gold recovery yields and environmental concerns: Thiosulfate leaching of gold ores has great potential to reduce the impact on the environment. Unlike cyanide, which is highly toxic, the chemicals used in the thiosulfate leaching process are benign.

  • Gold Leaching Equipment, Circuits Process Plants

    2020-6-25  Metallurgical ContentLeaching Gold CircuitsTypical Gold Milling Flowsheets Gold Leaching Equipment LayoutEasy Gold Plant and Business Expansion In Leaching for Gold, there is often a tendency to overlook or minimize the importance of the small mine. The small mine of today may develop into the large mine of tomorrow. Under proper management and financing it has as good a chance of