canada patents for gold leaching reagents

  • CA2599174C Method for leaching gold Google Patents

    In a method for leaching gold from copper sulfides, the sulfide ores are first subjected to leaching of copper, thereby producing a leaching residue having 7.9% or less of the copper content. This leaching residue is mixed with a leach liquor, which contains the chloride ion and ferric ion and has 1.9 or less of pH. Gold and copper can be effectively leached from the copper sulfide ores.

  • Cited by: 19
  • WO2013023297A1 Process of leaching patents.google

    The invention relates to modifications of a non-ammoniacal thiosulfate process of leaching precious metals (e.g. gold or silver) from precious metal-containing ores. The process involves leaching the ore with an aqueous lixiviant containing a soluble thiosulfate other than ammonium thiosulfate, a copper compound and an organic compound that serves as a copper ligand (i.e. a ligand-forming

  • Cited by: 6
  • US7025942B2 Control of lead nitrate addition in gold

    A method for controlling the extraction of gold from a gold ore by the cyanidation process in which a leaching step including the addition of a lead compound, which is typically lead nitrate or other lead salt, is used. In order to maintain stable conditions in the leaching process, and to use the leaching reagents efficiently, an analysis step is used to monitor the concentration of

  • Author: Guy Deschenes, Michael Fulton
  • GOLDIX Hydrometallurgy: Leaching in Heap, Vat, CIL, CIP

    Furthermore, thiocyanate is a sulfur-cyanide compound, and therefore is a “cyanide ore-processing reagent” as defined in 82-4-303 (5) MCA: “cyanide or a cyanide compound used as a reagent used in leaching operations.” 82-4-390 (1) MCA further adds that “Open-pit mining for gold or silver using heap leaching or vat leaching with

  • US7682420B2 Method for leaching gold Google Patents

    In a method for leaching gold from copper sulfides, the sulfide ores are first subjected to leaching of copper, thereby producing a leaching residue having 7.9% or less of the copper content. This leaching residue is mixed with a leach liquor, which contains the chloride ion and ferric ion and has 1.9 or less of pH. Gold and copper can be effectively leached from the copper sulfide ores.

  • Cited by: 19
  • US5260040A Extraction and recovery of gold Google Patents

    A process for the hydrometallurgical recovery of gold from gold-bearing material comprising the step of treating gold-bearing material with an acidic lixiviant solution containing thiourea and ferric ions, characterized in that the said solution also includes a complexing agent for ferric ions, whereby consumption of thiourea is significantly reduced.

  • Cited by: 12
  • New Eco-Friendly, Non-Cyanide Based Alternative for Gold

    Feb 08, 2017· The EnviroLeach reagent is ideally suited for the leaching of gold in an agitated or vat leach type process. This includes the treatment of whole ores, gravity concentrates, and flotation

  • Gold and Silver Leaching by Cyanidation

    What is the Effect of Aeration on Gold and Silver Leaching. Another of the prime requisites of successful cyanidation is free oxygen. Pure oxygen is too expensive to use, instead atmospheric air is the customary source of the required oxygen gas. Some interesting experiments have been conducted using Ozone but the practice has not been adopted commercially on account of the cost in the gold

  • Gold cyanidation Wikipedia

    Gold cyanidation (also known as the cyanide process or the MacArthur-Forrest process) is a hydrometallurgical technique for extracting gold from low-grade ore by converting the gold to a water-soluble coordination complex.It is the most commonly used leaching process for gold extraction.. Production of reagents for mineral processing to recover gold, copper, zinc and silver represents

  • Patents Hydrometallurgy & Environment

    Patents D. Dixon, O. Olvera, E. Asselin, A. Ghahremaninezhad and Z. Ren. “Process for leaching metal sulphides with reagents having thiocarbonyl functional groups”, University of British Columbia, US 2018/0135148A1.

  • Non-toxic leaching formula developed for e-scrap E-Scrap

    Aug 11, 2016· A leaching method can effectively extract precious metals from e-scrap without using toxic chemicals, the product’s creator said. British Columbia, Canada-based Mineworx said its HM X leach formula removes gold, palladium, platinum, silver and other metals from circuit boards and is safer than cyanide or other leaching formulas.

  • Gold leaching / Leaching reagents / Applications / Home

    Gold recovery increase in CIL circuit. Various trials have shown the potential of PIONERA BioPolymer to increase metal recovery in leaching circuits. This is especially relevant in the CIL/CIP circuits used in gold processing. The benefit of PIONERA BioPolymer is also observed in the Merrill Crowe process.

  • A Method for Leaching or Dissolving Gold from Ores or

    lurgical gold extraction routes utilize a leaching step to produce a gold-bearing solution as an intermediate product while the recycling of secondary gold from electronic and precious metal scrap is based on the selective and fast dissolu-tion of the precious metal. Therefore, A Method for Leaching or Dissolving Gold from Ores or Precious

  • Published in: JOM · 2005Authors: Nicolas Geoffroy · Francois CardarelliAffiliation: Mcgill University · Rio Tinto GroupAbout: Manganese · Occupational safety and health
  • Alternative Leaching Reagents for Gold SpringerLink

    Sodium cyanide has been the preponderant leaching reagent for gold due to its excellent extractions from a great variety of ores and its low cost. Although cyanide is poisonous, it has safe industrial and environmental records at the high pH range required in cyanide leaching.

  • Alternative lixiviants to cyanide for leaching gold ores

    4. HALIDE LEACHING Chlorine, bromine and iodine are well-known lixiviants for leaching gold, as recently reviewed by Tran et al. (2001). Chlorination was applied extensively in the late 19th century before the introduction of the cyanidation process. Bromine/bromide for leaching gold from ores was reported as early as 1846.

  • Eco-friendly gold leaching|Eco-Goldex Reagent

    Eco-Goldex's proprietary technology of electrowinning + Active Carbon (AC) adosrption method warrants over 99% gold recovery rate in E-scrap pregnant solution. Eco-Goldex claims that the extraodinary high stripping efficiency and gold recovrey rate of Eco-goldex E agent making it stand out among its competitors in the market.

  • Gold CIL & CIP Gold Leaching Process Explained CCD

    The gold cyanide complex is then extracted from the pulp or slurry by adsorption onto activated carbon. CIL stands for carbon-in-leach. This is a gold extraction process called cyanidation where carbon is added to the leach tanks (or reaction vessel) so that leaching

  • Jinchan gold ore dressing agent,leaching reagent,sodium

    Through many years of unremitting effort and cooperating with experts both at home and abroad, Senhe High Technology has successfully researched and developed "JINCHAN Gold Ore-dressing Agent" and owned the entire intellectual property of it. This...

  • US Patent for Method for recovering precious metals and

    The present disclosure is directed to a process for recovering a precious metal from a pregnant leach solution using a resin extractant. The precious metal is eluted from the loaded resin using an eluant comprising trithionate. The barren resin is contacted with a sulfide, bisulfide, and/or polysulfide to convert sorbed trithionate to thiosulfate.

  • HM X-leach MineworX

    The HM X-leach is a privately branded product under license to Mineworx by EnviroLeach Technologies Inc., who manufacture this patent-pending reagent. The HM X-leach is a cost-effective and eco-friendly alternative to the current toxic methods used in the hydrometallurgical extraction of precious metals in the mining and E-Waste sectors.

  • Gold Cyanidation Process Mineral Processing & Metallurgy

    The gold cyanidation process is the most important method ever developed for extracting gold from its ores. The reasons the widespread acceptance of cyanidation are economic as well as metallurgical. It usually obtains a higher recovery of gold than plate amalgamation and is easier to operate than the chlorine or bromine process.

  • Iberian develops new enviro-friendly alternative to cyanide

    Iberian develops new enviro-friendly alternative to cyanide Posted by John on 28th July 2016 Iberian Minerals Ltd has filed a patent with the US Patent and Trademark Office (USPTO) for its HM X-leach, a proprietary, environmentally-friendly, non-cyanide based leach formula for the extraction of precious metals from ores, concentrates, tailings

  • US Patent for Process of leaching precious metals Patent

    Aug 14, 2012· The invention relates to modifications of a non-ammoniacal thiosulfate process of leaching precious metals (e.g. gold or silver) from precious metal-containing ores. The process involves leaching the ore with an aqueous lixiviant containing a soluble thiosulfate other than ammonium thiosulfate, a copper compound and an organic compound that serves as a copper ligand (i.e. a ligand

  • Patents Assigned to Barrick Gold Corporation Justia

    Oct 05, 2017· Justia Patents Patents Assigned to Barrick Gold Corporation Patents Assigned to Barrick Gold Corporation Co-current and counter current resin-in-leach in gold leaching processes Abstract: A method to recover gold lost in roaster calcine-leach tailings, due to the formation of cyanide refractory compounds or morphologies during the roasting

  • HM X-leach MineworX

    The HM X-leach is a privately branded product under license to Mineworx by EnviroLeach Technologies Inc., who manufacture this patent-pending reagent. The HM X-leach is a cost-effective and eco-friendly alternative to the current toxic methods used in the hydrometallurgical extraction of precious metals in the mining and E-Waste sectors.

  • Gold Cyanidation Process Mineral Processing & Metallurgy

    The gold cyanidation process is the most important method ever developed for extracting gold from its ores. The reasons the widespread acceptance of cyanidation are economic as well as metallurgical. It usually obtains a higher recovery of gold than plate amalgamation and is easier to operate than the chlorine or bromine process.

  • Iberian develops new enviro-friendly alternative to cyanide

    Iberian develops new enviro-friendly alternative to cyanide Posted by John on 28th July 2016 Iberian Minerals Ltd has filed a patent with the US Patent and Trademark Office (USPTO) for its HM X-leach, a proprietary, environmentally-friendly, non-cyanide based leach formula for the extraction of precious metals from ores, concentrates, tailings

  • US Patent for Process of leaching precious metals Patent

    Aug 14, 2012· The invention relates to modifications of a non-ammoniacal thiosulfate process of leaching precious metals (e.g. gold or silver) from precious metal-containing ores. The process involves leaching the ore with an aqueous lixiviant containing a soluble thiosulfate other than ammonium thiosulfate, a copper compound and an organic compound that serves as a copper ligand (i.e. a ligand

  • Patents Assigned to Barrick Gold Corporation Justia

    Oct 05, 2017· Justia Patents Patents Assigned to Barrick Gold Corporation Patents Assigned to Barrick Gold Corporation Co-current and counter current resin-in-leach in gold leaching processes Abstract: A method to recover gold lost in roaster calcine-leach tailings, due to the formation of cyanide refractory compounds or morphologies during the roasting

  • THIOSULPHATE LEACHING AN ALTERNATIVE TO

    thiosulphate leaching flowsheet is very similar to a conventional cyanide leach. SGS is a global technical leader in the field of thiosulphate leaching, and our laboratory and industry experts have spent years designing and developing the technique into a viable alternative to cyanide for some gold

  • Alternative Lixiviants to Cyanide for Leaching Gold Ores

    In recent studies investigating in situ leaching, low-reagent concentrations (e.g., 10 mM Ie and 5 mM I2), with gold leach rates similar to those obtained using an air-saturated 2.7 mM cyanide solution, were found effective in treating an oxidized ore (Roberts et al., 2010).

  • US Patent for Metal, particularly gold, recovery from

    Justia Patents Leaching, Washing, Or Dissolving US Patent for Metal, Once the bulk of the gold values has been recovered from the leach solution, the problem remains to recover the residual amounts of gold. The above three methods have the disadvantage that they are expensive and employ unpleasant reagents.

  • (PDF) A method for leaching or dissolving gold from ores

    A method for leaching or dissolving gold from ores or precious metal scrap. Several reagents are known to leach . Thereof, ” U.S. patent 4,397,689 (9 A ugust 1983).

  • Alkaline Glycine Systems as Alternatives Reagents for

    Alkaline leaching of copper is: More selective. Less corrosive. Lowering reagent consumption. No special materials of construction are required. No sulfur, gels and jarosite precipitation. Particularly useful when followed by alkaline gold or silver leaching (cyanide or glycine based). Does not passivate gold in a subsequent leach.

  • GOLD & SILVER RECOVERY INNOVATIONS

    INNOVATIVE MECHANICAL DESIGN SAVES REAGENT COSTS AT NEWMONTS RAIN PLANT AT CARUN 175 Jim Komadina A Leonard Harris PEROXIDE ADDITION IMPROVES GOLD RECOVERY AND SAVES REAGENTS AT PINE CREEK GOLD MINE 179 Vivienne Lee, Peter Robinson A Fred Men PRACTICAL USE OF OXYGEN FOR GOLD LEACHING IN CANADA 183 Jacques McMullen A Rob

  • Corvus Gold Receives Sulfide Gold Recovery of +90% Using

    which is a key reagent. Corvus Gold will report additional results for the other host units and heap leach tests as data becomes available. Corvus Gold is also conducting column leach tests patterned after those used at the Hycroft project where trona was used as the additive, and that were scaled up to two, successful 5,000t test pads.

  • Alternative gold leaching chemical of cyanide|Eco-Goldex

    Eco-Goldex is planning to set a new metallurgical testing lab with its partner in Canada, to facilitate clients sample tests requirements in order to support their gold leaching reagent switching from cyanide to Eco-goldex. These advantages of company resource distribution and management, together with its sophisticated logistic service system

  • Gold Processing Plants & Complete Ore Process Plant

    The chart/table below are crude budgetary estimations for the cost of major plant equipment. Actual cost will vary depending of the process details and detailed equipment list and origin. Please use this to decide if your project and dream for becoming a miner or mining company is something you can afford. This is only an approximation.