extraction of gold by cyanide process patent

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  • CYANIDE-FREE PROCESS FOR GOLD EXTRACTION

    CYANIDE-FREE PROCESS FOR GOLD EXTRACTION DUNDEE SUSTAINABLE TECHNOLOGIES 3700 rue du Lac Noir Thetford Mines, QC, Canada 418-423-7247 600 de Maisonneuve, Suite 2750

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    A gold thiosulfate leaching process uses carbon to remove gold from the leach liquor. The activated carbon is pretreated with copper cyanide. A copper (on the carbon ...

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    Patent US2127240 Chloridizingcyanide process for Try the new Google Patents, Chloridizingcyanide process for extracting values from ores US 2127240 A. Abstract ...

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    In addition, two American patents for the extraction of gold from its ores (those of Rae, 1867 and Simpson, 1885) included potassium cyanide in their specifications but the MacArthur-Forrest patent was the first to specify solely a dilute cyanide solution.

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  • Patent US5667557 Hydrometallurgical extraction and ...

    This invention is related to hydrometallurgical extraction processes and specifically to the extraction of copper either alone or in the presence of gold from processed ore by cyanide leaching to provide gold and copper or mixtures thereof for the metal purification step of the overall metallurgical process.

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  • The Metallurgy of Cyanide Gold Leaching An Introduction

    Leaching gold with a cyanide solution remains the most widely used hydrometallurgical process for the extraction of gold from ores and concentrates.

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    INVITED KEYNOTE & PLENARY PRESENTATIONS (Click on links below to view the PDF files.) Innovation, Energy Efficiency and Sustainability in Mineral Processing ...

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    Tailings, also called mine dumps, culm dumps, slimes, tails, refuse, leach residue or slickens, terra-cone (terrikon), are the materials left over after the process ...

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  • Patent US8038974 Aqueous solutions containing metal ...

    In this case, in the solution according to the invention, at least a part of the water is obtained from wastewater which occurs as depleted wastewater in a process for the extraction of noble metals from noble metal-containing ores by the cyanide process.

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  • The Cyanide Process for the Treatment of Gold Ores

    The Cyanide Process for the Treatment of Gold ... of this solubility of gold in cyanide solution for the extraction of Œ01d from ... the cyanide process patents of

    • Published in: Journal of The Franklin Institute-engineering and Applied MathematicsAuthors: Joseph William RichardsAffiliation: Lehigh UniversityAbout: Gold cyanidation · Gold · Extraction
    • · Web view

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    • WANT OF NOVELTY AND PATENT LITIGATION:

      32 Prometheus, VolJ3. No. J. June J995 'WANT OF NOVELTY'AND PATENT LITIGATION: THE CASE OF THE CYANIDE PROCESS OF GOLD EXTRACTION, 1892-1902 Alan Lougheed

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      Energy and the Human Journey: Where We Have Been; Where We Can Go. By Wade Frazier . Version 1.2, published May 2015. Version 1.0 published September 2014.

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      Tickers: XOTC:GPHBF, XTSX:GGG Tags: Mining. Calverton, NY / TheNewswire / December 20, 2017 Graphene 3D Lab Inc. (the "Company" or