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  • US Patent Application for PROCESS FOR THE RECOVERY OF GOLD ...

    Feb 04, 2011  A process and system for recovery of gold from an ore having the steps of i) providing the ore containing the gold to be recovered, ii) leaching the ore in an oxidative chloride medium, including a nitrogen species to produce a solution comprising gold; and iii) recovering the gold from the solution. The gold in a preferred embodiment is recovered from refractory and carbonaceous ores.

  • US3574600A - Process for recovery of gold from ...

    carbonaceous gold ores are rendered amenable to a conventional cyanide recovery process by pretreatment with acid-ozone mixture, or alkaline sodium hypochlorite or alkaline calcium hypochlorite compounds at temperatures under 70*c. hypochlorite solutions can be generated in situ by electrolysis of chloride solutions.

  • Cited by: 119
  • US4289532A - Process for the recovery of gold from ...

    The recovery of gold from refractory carbonaceous gold-containing ores by cyanidation techniques is improved by subjecting an oxidized slurry of this type of ores to simultaneous cyanidation and countercurrent granular activated carbon adsorption in two or more stages. The gold transfers to the carbon and may be separated from it by conventional methods.

  • Cited by: 119
  • WO1999013116A1 - Process for recovery of gold and/or ...

    Processes for the recovery of gold and/or silver from lixiviant solutions include a preliminary step of: (a) contacting the lixiviant solution with ion exchange resins containing amine functionality, optionally dispersed or distributed within a polyurethane matrix and/or in the presence of an alcohol that is substantially insoluble in the lixiviant solution, or (b) contacting the lixiviant ...

  • Cited by: 8
  • US Patent for Process for recovering gold Patent (Patent ...

    A method is disclosed for recovering gold from solution by means of adsorbing the solution onto a silica-containing catalyst to form a gel, reducing the gold with oxalic acid, removing the precipitated gold by washing, and recycling the catalyst and any unused reducing agent immediately to the adsorption step. The size of the gold particle produced is directly proportional to the grade of the ...

  • US Patent for Process for recovering gold and silver from ...

    Referring to FIG. 6, it can be seen that gold recovery and concentrate grade (sulfide sulfur) is superior for the conventional process at concentrate grades less than about 4% sulfur but superior for the MCF2 process at concentrate grades higher than about 4% sulfur.At a target concentrate grade of 7% S or greater, the MCF2 process showed approximately 2% higher Au recovery.

  • Gold Extraction Recovery Processes

    Process DevelopmentSelecting A ProcessGold RecoveryAmalgamationFlotationLeachingConsidering the different gold minerals present alone or combined with the host rock, it will be necessary to discharge the unwanted material in order to increase the concentration of gold in an economically manner. This part treats the strategy of beneficiation as a combination of several processes. Joining together these units make possible to develop an appropriate flowsheet whose objective is to recover gold and the precious metals present in the ore.Perhaps, one of the greatest challenge...
  • WO2014064530A1 - Recovery of gold from roaster calcine ...

    RECOVERY OF GOLD FROM ROASTER CALCINE LEACH TAILINGS . CROSS REFERENCE TO RELATED APPLICATION . The present application claims the benefits of U.S. Provisional Application Serial Nos. 61/717,405, filed October 23, 2012, and 61/730,860, filed November 28, 2012, both entitled "RECOVERY OF GOLD FROM ROASTER CALCINE LEACH TAILINGS", which is incorporated

  • US20030039605A1 - Process for the recovery of precious ...

    The invention relates to a process for recovering precious metals from fine carbon bearing residual amounts of precious metals. The process involves the incineration of the carbon, followed by a method for separating the precious metals from carbon ash. Possible methods include cyanidation, gravity concentration, smelting, electrowinning and solvent extraction.

  • Gold-Copper Ores - ScienceDirect

    The lower adsorption of Cu (CN) 3 2 − and Cu (CN) 4 3 − onto activated carbon accounts for the use of high cyanide concentrations to improve the selectivity of gold over copper when this adsorbent is used for gold recovery. In contrast the use of low cyanide concentrations is used to promote selectivity and higher adsorption of Cu (CN) 2 − on to activated carbon as a copper removal ...

  • Gold Extraction Recovery Processes

    Gold recovery with sluices can vary depending on several factors. Fine gold losses can be minimized by cleaning up more frequently, reducing the speed of the slurry flow to around 0.50 to 0.80 m/s., and decreasing the feed size by performing a previous screening. Some experienced operators have increased recovery by adding a liner to the sluice ...

  • US Patent for Method for recovering gold Patent (Patent ...

    The invention relates to a method for recovering gold in connection with the hydrometallurgical production of copper from a waste or intermediate product containing sulphur and iron that is generated in the leaching of the copper raw material. The recovery of both copper and gold occurs in a chloride environment. The gold contained in the waste or intermediate is leached by means of divalent ...

  • Gold-Copper Ores - ScienceDirect

    The lower adsorption of Cu (CN) 3 2 − and Cu (CN) 4 3 − onto activated carbon accounts for the use of high cyanide concentrations to improve the selectivity of gold over copper when this adsorbent is used for gold recovery. In contrast the use of low cyanide concentrations is used to promote selectivity and higher adsorption of Cu (CN) 2 − on to activated carbon as a copper removal ...

  • CHEMICAL REFINING PROCESS FOR Pb, Au AND Ag

    subsequent recovery of Pb and the precious metals Ag and Au. The residue is first treated with a saturated sodium chloride solution, whereupon a chloride solution of lead (NaPbCl3) is obtained. From the chloride solution, lead was deposited in the form of lead carbonate, followed by reductive melting, ... Patent WO2012141607 A1, Gold and silver ...

  • Gold processing Britannica

    Gold processing, preparation of the ore for use in various products.. For thousands of years the word gold has connoted something of beauty or value. These images are derived from two properties of gold, its colour and its chemical stability.The colour of gold is due to the electronic structure of the gold atom, which absorbs electromagnetic radiation with wavelengths less than 5600 angstroms ...

  • Sluice Goose Industries - Gold Recovery, Gold Processing

    U.S. PATENT # 10065197 is granted, and now we begun to manufacture Sluice Goose GOLDROP: To aid in fine and coarse GOLD recovery for the individual prospector. To scale up for large GOLD-MINING operations. Questions, comments may be emailed to [email protected]

  • Greengold THE RECYN PROCESS

    GREEN GOLD TECHNOLOGY can provide a significant opportunity to reduce operating costs and at the same time improve environmental performance. The resin based process offers a proven method for achieving virtually complete removal and efficient recovery of cyanide, dissolved base metals and precious metals from gold plant process streams.

  • Recovery of gold from secondary sources—A review ...

    This paper presents an overview of the various methodologies used in the recovery of gold from secondary sources. Gold recovery is interesting due to its vast industrial applications, high market prices and extensively used precious metal, the sanctuary value attributed to gold during international political and economical crises, and the limited resource of this metal may explain the recent ...

  • Gold leaching by organic base polythionates: new non-toxic ...

    Method of gold recovery from sulfide auriferous ores has already been proposed (Smolyaninov et al. 2010b). The invention relates to the method of gold recovery from powdered sulfide auriferous ores after their unlocking by bacterial leaching or by oxidation roasting, or by autoclave oxidation.

  • Selective isolation of gold facilitated by second-sphere ...

    Gold recovery using environmentally benign chemistry is imperative from an environmental perspective. Here we report the spontaneous assembly of a one-dimensional supramolecular complex with an extended {[K(OH 2) 6][AuBr 4] (α-cyclodextrin) 2} n chain superstructure formed during the rapid co-precipitation of α-cyclodextrin and KAuBr 4 in water. This phase change is selective for this gold ...

  • Patent process overview USPTO

    The patent grant is mailed on the issue date of the patent. It includes any references to prior patents, the inventor(s)') names, specification, and claims (to name a few). It is bound in an attractive cover and includes a gold seal and red ribbon on the cover.

  • Gold Recovery via Copper Electrolysis - Part 1 - YouTube

    Jun 09, 2019  In part 1 I explain the way Gold can be recovered from a mixture of Gold and Copper (Gold plated pins for example) via electrolytic refining of

  • How To Use Mercury To Recover Gold

    Sometimes placer gold will be covered with a thin film of oil, which will prevent the gold from being amalgamated unless the oil is cleaned off first. PROCEDURE to Recover Gold with Mercury Bathe the concentrates in a 10 to 1 solution of nitric acid – meaning 10 parts of water to 1 part of nitric acid.

  • METHOD OF RECOVERY OF GOLD AND OTHER METALS - Patent ...

    Method for the selective extraction of the metals gold, silver, platinum or mercury ions or colloidal gold, from an aqueous solution containing at least one of these metal ions which comprises contacting the solution, at a pH of 2 or less, with cells or cell extracts of a microorganism capable of binding these metals for a period of time and under conditions sufficient to allow binding of the ...

  • Greengold THE RECYN PROCESS

    GREEN GOLD TECHNOLOGY can provide a significant opportunity to reduce operating costs and at the same time improve environmental performance. The resin based process offers a proven method for achieving virtually complete removal and efficient recovery of cyanide, dissolved base metals and precious metals from gold plant process streams.

  • CHEMICAL REFINING PROCESS FOR Pb, Au AND Ag

    subsequent recovery of Pb and the precious metals Ag and Au. The residue is first treated with a saturated sodium chloride solution, whereupon a chloride solution of lead (NaPbCl3) is obtained. From the chloride solution, lead was deposited in the form of lead carbonate, followed by reductive melting, ... Patent WO2012141607 A1, Gold and silver ...

  • METHOD OF RECOVERY OF GOLD AND OTHER METALS - Patent ...

    Method for the selective extraction of the metals gold, silver, platinum or mercury ions or colloidal gold, from an aqueous solution containing at least one of these metal ions which comprises contacting the solution, at a pH of 2 or less, with cells or cell extracts of a microorganism capable of binding these metals for a period of time and under conditions sufficient to allow binding of the ...

  • Method of gold and silver recovery from concentrates

    Recovery of gold from solutions after leaching is carried out in the cell with the plate titanium cathodes (extraction of gold cathode sludge 70-80%). After electrolysis gold doizvlekali sorption on active coal (Apparence, Viabilizem, Tab "Thiocarbamide the leaching of antimony concentrates non-ferrous metallurgy, 1987, No. 4, pp. 27-29).

  • Process for the recovery of gold - Great Lakes Chemical ...

    Jun 26, 1990  After four hours of agitation, the leachate was separated from the residue and analyzed for gold by atomic absorption spectrophotometer. It contained 62.0 mg/L gold as gold bromide complex ion. C. Recovery of Gold by Sphagnum Peat Moss. A sample (5 gram) of the acid washed (-10 to +200 mesh size) moss was contacted with the leachate (100mL).

  • Gold recovery: Fully Illustrated Step by Step Guide on How ...

    Gold recovery: Fully Illustrated Step by Step Guide on How to extract 98% or more Pure Gold with Chemical process from Gold Plated Electronics Pins and ... Refine, Electrolysis, smelting. Book 4) - Kindle edition by Aurman, Donald. Download it once and read it on your Kindle device, PC, phones or tablets. Use features like bookmarks, note taking and highlighting while reading Gold recovery ...

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  • Gold Recovery via Copper Electrolysis - Part 1 - YouTube

    Jun 09, 2019  In part 1 I explain the way Gold can be recovered from a mixture of Gold and Copper (Gold plated pins for example) via electrolytic refining of

  • Process for the recovery of precious metals from fine ...

    Feb 27, 2003  The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows: 1. A process for the recovery of precious metals which are adsorbed onto fine activated carbon, consisting of heating said fine activated carbon to a temperature of between 600° C. and 800° C., incinerating said fine activated carbon and cooling the resultant carbon ash.

  • How To Use Mercury To Recover Gold

    Sometimes placer gold will be covered with a thin film of oil, which will prevent the gold from being amalgamated unless the oil is cleaned off first. PROCEDURE to Recover Gold with Mercury Bathe the concentrates in a 10 to 1 solution of nitric acid – meaning 10 parts of water to 1 part of nitric acid.

  • Search for patents USPTO - United States Patent and ...

    The United States Patent and Trademark Office (USPTO) Public Search Facility located in Alexandria, VA provides the public access to patent and trademark information in a variety of formats including on-line, microfilm, and print.

  • Treatment Of Copper Refinery Slimes - Patent Lens

    Process for the recovery of gold, silver and selenium from copper refinery slimes containing these metals which comprises: treating the raw slimes with a dilute solution of sulfuric acid at a temperature of between about 40° and 100° C. and at a partial pressure of oxygen of between about 5 to 50 lbs. per square inch gauge to obtain a leach solution containing at least about 98% by weight of ...

  • Artisanal and Small-Scale Gold Mining Without Mercury ...

    Sluice design can lead to higher gold recovery if the force of the water traveling through the sluice is decreased. A series of rifles can help break the flow to improve recovery. A zig zag sluice also achieves this by creating a drop between the first and second platform that disrupts the velocity of the water as it travels down the sluice.

  • Gold Recovery Correctly : 12 Steps - Instructables

    Gold Recovery Correctly: I will detail a SAFE process of turning old electronic parts into little round lumps of pure gold. There are many tutorials that claim to offer methods of gold recovery such as "Cupellation"*. These processes are DANGEROUS and put the user at t...

  • ROMEO: an ENEA patent to recover gold and silver from old ...

    ROMEO: an ENEA patent to recover gold and silver from old electronic devices Presented during the event Ecomondo dedicated to green economy, this patent aims at innovating the recycling industry, by reducing energy costs and environmental impact of processes used for this type of recovery.

  • How To Use Mercury To Recover Gold

    Sometimes placer gold will be covered with a thin film of oil, which will prevent the gold from being amalgamated unless the oil is cleaned off first. PROCEDURE to Recover Gold with Mercury Bathe the concentrates in a 10 to 1 solution of nitric acid – meaning 10 parts of water to 1 part of nitric acid.

  • ROMEO: an ENEA patent to recover gold and silver from old ...

    ROMEO: an ENEA patent to recover gold and silver from old electronic devices Presented during the event Ecomondo dedicated to green economy, this patent aims at innovating the recycling industry, by reducing energy costs and environmental impact of processes used for this type of recovery.

  • Artisanal and Small-Scale Gold Mining Without Mercury ...

    Sluice design can lead to higher gold recovery if the force of the water traveling through the sluice is decreased. A series of rifles can help break the flow to improve recovery. A zig zag sluice also achieves this by creating a drop between the first and second platform that disrupts the velocity of the water as it travels down the sluice.

  • PMPC Gold Bug - efficient and cost effective electrolytic ...

    The Gold Bug is King! We use it for our gold recovery and it does a remarkable job. We have also found it to be quite useful in recovering the palladium from our electroless copper activator solution. When the bath is spent, The Gold Bug is able to remove all the palladium to low concentrations.

  • Large Scale Gold Refining By the Aqua Regia Acid Method

    Discarding gold solution that has been tested "no gold" by old and used up test solution can be very costly. 6. Bibliography. Refining Precious Metal Wastes by C.M. Hoke. Metallurgical Publishing Co., 123 William Street, New York, U.S.A. 1940. University Microfilms International, 300 N. Zeeb Road, Ann Arbor, Michigan 48106, U.S.A. and 18 Bedford Row, London WC1R 4EJ, England.

  • Stephen FOLEY, et al. : Gold Extraction

    The '202 patent describes that gold disturbs the extraction of palladium with DHS. Thus for extraction of palladium by DHS, gold must be removed at first because DHS cannot extract gold and/or palladium simultaneously. Consequently, there is a major drawback of DHS employed as an extractant since it yields a very low extraction kinetic and is ...

  • Sustainable technique recovers gold from e-waste cheaply

    Recycling gold from jewelry or electronic scraps—think computer chips and circuits lined with thin layers of gold—is not without issue either. Annually, Foley explained, the world produces ...

  • PMPC - Gold Recovery, Electrowinning of Heavy and Precious ...

    PMPC specializes in the gold electrowinning or electrolytic recovery of heavy and precious metals from many different types of solutions with a wide range of pH. For 40 years, we have been developing reclamation and recycling technology offering innovative solutions to electrolytic metal recovery problems including gold, palladium, silver and more.

  • Thiourea Gold Leaching - Metallurgist Mineral Processing ...

    Table of ContentsAdsorption Gold Thiourea Cation Exchange ResinThiourea ConcentrationThiourea Consumption during Gold Leaching The use of thiourea, (CS(NH2)2 as a complexing/extracting agent for gold and other precious metals has shown promise for implementation in the mining/metals industry. Laboratory testing of this reagent has indicated that a thiourea process for gold extraction has ...

  • Patents USPTO - United States Patent and Trademark Office

    WASHINGTON — The United States Patent and Trademark Office (USPTO) is seeking nominations to fill upcoming vacancies for USPTO extends certain CARES Act relief for small and micro entities The USPTO has extended from July 1, 2020, to September 30, 2020, the time for small and micro

  • Mercury control in the cyanidation of gold ores

    detrimental effect on gold recovery. Table 1. Precipitation and Removal of Mercury from Cyanide Solutions with SBOC. Percent Precipitated Percent Precipitated Molar Ratio from Hg(CNh ° from Hg(CN)42-SBOC/Hg Solution Solution 1:1 71.5 96.0 2:1 96.8

  • How to Extract Gold From Electronics : 11 Steps (with ...

    This pushes the gold foils off the filter and into the cup. Then, wait for the gold foils to settle to the bottom and get as much water out. After that, you could wait for the water to evaporate out and you are left with just gold. However, the gold foils tend to stick to the cup, so I keep mine in a glass vial with some water.

  • (PDF) Mathematical Modelling of Gold Ore Heap Leaching

    The recovery of gold from ore, the residual concentration of the cyanide and the enrichment of the pregnant leach solution can be calculated from interactions among these layers. A simplified ...

  • KCA Carbon Converter - Carbon Fines Processing

    Dirty, wet carbon fines are loaded directly into the roasting chamber and feather-light carbon ash is fully captured as a dry product. A three-stage exhaust scrubbing system fully captures mercury to satisfy emission standards of every U.S state and foreign country. 99.9% gold and silver recovery