preg robbing gold in autoclave oxidation

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  • Preg-robbing gold ores ScienceDirect

    Jan 01, 2005· Preg-robbing is an important phenomenon that inhibits gold recovery due to the presence of naturally occurring carbonaceous matter. In case of certain ores, gold recovery by cyanidation is limited by the presence of naturally occurring carbonaceous material that adsorbs gold from alkaline cyanide solution unless steps are taken to prevent this adsorption reaction

  • Autoclave an overview ScienceDirect Topics

    Preg-Robbing Gold Ores. J.D. Miller, X. Díaz, in Gold Ore Processing (Second Edition), 2016. 3.5 Pressure Oxidation. This technique uses autoclave leaching with pure air/oxygen, high pressure, and temperature for the treatment of refractory carbonaceous ore treatment (Sibrell,

  • PROCEDURE FOR CHARACTERIZATION OF CARBONACEOUS

    Autoclave pressure oxidation (AC POX) of refractory sulphide ores and subsequent cyanidation is or preg-rob gold from the cyanide leach solution. Carbonaceous matter present in the Carlin type carbonaceous sulphide ores has shown varying degree of preg-robbing activity [1-3]. In that regard it is important to develop technology and

  • Yakov Shneerson's research works

    Yakov Shneerson's 9 research works with 23 citations and 1,191 reads, including: The use of Mercury to inhibit Autoclave preg-robbing of Gold: Pilot Plant trials

  • preg-robbing Archives International Mining

    Tag Archives: preg-robbing. Polymetal to expand pressure oxidation gold treatment in Russia. 11th February 2019 Metallurgy, Mine operation news, Mineral processing, adding that the new facility would use a titanium-lined steel autoclave operating at 240˚С and a pressure of 43 bar.

  • US5536297A Gold recovery from refractory carbonaceous

    A process for recovering gold in which an ore slurry of refractory sulfidic and refractory carbonaceous ore having preg-robbing characteristics due to the presence of organic carbon is subjected to pressure oxidation in an autoclave. The oxidized ore slurry is mixed with a thiosulfate salt lixiviant, which mixture is maintained at a pH between 7 and 8.7 while the slurry

  • Yakov Shneerson's research works

    Yakov Shneerson's 9 research works with 23 citations and 1,191 reads, including: The use of Mercury to inhibit Autoclave preg-robbing of Gold: Pilot Plant trials

  • preg-robbing Archives International Mining

    Tag Archives: preg-robbing. Polymetal to expand pressure oxidation gold treatment in Russia. 11th February 2019 Metallurgy, Mine operation news, Mineral processing, adding that the new facility would use a titanium-lined steel autoclave operating at 240˚С and a pressure of 43 bar.

  • US5536297A Gold recovery from refractory carbonaceous

    A process for recovering gold in which an ore slurry of refractory sulfidic and refractory carbonaceous ore having preg-robbing characteristics due to the presence of organic carbon is subjected to pressure oxidation in an autoclave. The oxidized ore slurry is mixed with a thiosulfate salt lixiviant, which mixture is maintained at a pH between 7 and 8.7 while the slurry is agitated in a

  • Deportment of gold in an autoclave pressure oxidation (AC

    The gold deportment data show that 37.5% of the gold losses in the CIL residue are related to sub-microscopic gold contained in the unoxidized pyrite mineral phase (Figure 1). The carbonaceous matter present in the ore exhibits strong preg-robbing capacity and contributes to 44.5% of the gold losses in the form of surface gold (Figure 1).

  • CIL Gold Loss Characterization within Oxidized Leach Tails

    characterization, diagnostic leach tests, and preg-robbing tests. 2. Material and Methods Mineralogical characterization, DLT, and adsorption tests were performed to study the gold distribution and preg-robbing, using four samples taken from the mill carbon in leach (CIL) tailings at the Kittilä Mine in Finland (oxidized tailings).

  • Barrick Gold Corporation Mitacs

    Autoclave treatment of refractory sulfide gold ores oxidizes minerals, such as pyrite, containing gold that cannot be recovered through conventional cyanidation. Oxidation liberates the gold by putting iron into solution. At high temperature and pressure, the dissolved iron tends to precipitate.

  • pressure oxidation Archives International Mining

    “Pressure oxidation was selected as the most feasible processing technology for double refractory ores. It is able to achieve gold recoveries of 96% by utilising high temperatures, elevated pressure and oxygen to recover encapsulated gold, while conventional cyanidation methods would result in sub-optimal recovery rates of 20-40%.

  • Adsorption of aurocyanide complexes onto carbonaceous

    test. In the preg-robbing test, a percent preg-robbing value %PR is obtained by measuring the change inŽ. solution of gold concentration after contacting a gold–cyanide solution with a known mass of ore in batch for 15 min 5,10 . The ability of the preg-rob-wx bing test to predict the preg-robbing

  • PREG-ROBBING CARBONACEOUS MATTER: AN EVALUATION

    ways: a) Pressure oxidation for sulphide oxidation and CM passivation; recommended grain sizes should be smaller than 25 microns and autoclave operated at the temperatures of 225°C or greater. The approach is primarily limited to processing double refractory ores with low preg-rob capacity due to limited oxidation effect on CMs (Simmons, 1995).

  • Gold Ore Processing, Volume 15 2nd Edition

    Gold Ore Processing: Project Development and Operations, Second Edition, brings together all the technical aspects relevant to modern gold ore processing, offering a practical perspective that is vital to the successful and responsible development, operation, and closure of any gold ore processing operation.This completely updated edition features coverage of established, newly implemented

  • Gold Recovery 101 Sepro Systems

    disseminated gold particles can be trapped within the mineral matrix, even at fine grind sizes. The ore can contain highly reactive minerals that consume free cyanide or oxygen. In addition, the ore can contain preg-robbing elements such as organic carbon that will re-adsorb the dissolved gold as it is leached.

  • Gold extraction Wikipedia

    If the gold can not be concentrated for smelting, then it is leached by an aqueous solution: . The cyanide process is the industry standard.; Thiosulfate leaching has been proven to be effective on ores with high soluble copper values or ores which experience preg-robbing: the absorption by carbonaceous components which preferentially absorbs gold and gold-cyanide complexes.

  • Minerals Free Full-Text CIL Gold Loss Characterization

    A double refractory gold ore contains gold particles locked in sulphides, solid-solution in arsenopyrite, and preg-robbing material such as carbonaceous matter, and so on. The diagnostic leach test (DLT) and preg-robbing (PR) approaches are widely used to investigate the occurrence and the distribution of refractory gold. DLT serves to qualitatively evaluate the gold occurrences within the ore.

  • Barrick Thiosulfate Leaching of Double Refractory Ore

    ores can induce “preg-robbing”. Carbon is used to adsorb the gold in the aurocyanide in solution during gold recovery as shown in Eq. 4.1 𝐴( )2−+ − →𝐴 Q++ t − . v When this reaction happens, the gold that is locked within the carbon ore will not be extracted, and will be disposed of in the tailings, creating loss.

  • US5536297A Gold recovery from refractory carbonaceous

    A process for recovering gold in which an ore slurry of refractory sulfidic and refractory carbonaceous ore having preg-robbing characteristics due to the presence of organic carbon is subjected to pressure oxidation in an autoclave. The oxidized ore slurry is mixed with a thiosulfate salt lixiviant, which mixture is maintained at a pH between 7 and 8.7 while the slurry is agitated in a

  • PREG-ROBBING CARBONACEOUS MATTER: AN EVALUATION

    ways: a) Pressure oxidation for sulphide oxidation and CM passivation; recommended grain sizes should be smaller than 25 microns and autoclave operated at the temperatures of 225°C or greater. The approach is primarily limited to processing double refractory ores with low preg-rob capacity due to limited oxidation effect on CMs (Simmons, 1995).

  • Gold extraction Wikipedia

    If the gold can not be concentrated for smelting, then it is leached by an aqueous solution: . The cyanide process is the industry standard.; Thiosulfate leaching has been proven to be effective on ores with high soluble copper values or ores which experience preg-robbing: the absorption by carbonaceous components which preferentially absorbs gold and gold-cyanide complexes.

  • Minerals Free Full-Text CIL Gold Loss Characterization

    A double refractory gold ore contains gold particles locked in sulphides, solid-solution in arsenopyrite, and preg-robbing material such as carbonaceous matter, and so on. The diagnostic leach test (DLT) and preg-robbing (PR) approaches are widely used to investigate the occurrence and the distribution of refractory gold. DLT serves to qualitatively evaluate the gold occurrences within the ore.

  • The modes of gold loss in the calcium thiosulfate leaching

    The processing of gold is becoming more complicated due to the increasingly complex nature of the remaining gold-bearing ore bodies. This worldwide phenomenon is the driving force for the development of alternative technologies for the leaching and recovery of gold from so-called double refractory ores. Barrick Gold recently commercialized a unique calcium thiosulfate leaching plant to treat

  • Patents Assigned to Barrick Gold Corporation Justia

    Abstract: A process for recovering gold in which an ore slurry of refractory sulfidic and refractory carbonaceous ore having preg-robbing characteristics due to the presence of organic carbon is subjected to pressure oxidation in an autoclave. The oxidized ore slurry is mixed with a thiosulfate salt lixiviant, which mixture is maintained at a

  • Refining Gold Processing E & MJ

    Screens are used in a variety of applications in gold concentrators. Removing preg-robbing trash, separating slurry from loaded carbon, sizing of carbon, dewatering of carbon and, as a safety device to prevent loaded carbon from going to tails, are just a few examples.

  • The leaching and adsorption behaviour of gold ores

    5.3 preg-robbing behaviour by the ores at low cyanide concentrations 118 5.4 the effect of activated carbon and cyanide on the reversibility of preg-robbing 122 5.5 the role of fe(cn)6 4-in preg-robbing 127 5.6 comparison of preg-robbing between the concentrates and gold-free mineral samples 131

  • Gold Recovery 101 Sepro Systems

    disseminated gold particles can be trapped within the mineral matrix, even at fine grind sizes. The ore can contain highly reactive minerals that consume free cyanide or oxygen. In addition, the ore can contain preg-robbing elements such as organic carbon that will re-adsorb the dissolved gold as it is leached.

  • Barrick Thiosulfate Leaching of Double Refractory Ore

    ores can induce “preg-robbing”. Carbon is used to adsorb the gold in the aurocyanide in solution during gold recovery as shown in Eq. 4.1 𝐴( )2−+ − →𝐴 Q++ t − . v When this reaction happens, the gold that is locked within the carbon ore will not be extracted, and will be disposed of in the tailings, creating loss.

  • Determining Gold Balance In Refractory Gold Ores

    Trace amounts of gold with a mixture of illite/smectite clay, montmorillonite and free carbon were observed by Laser Ablation Inductively Coupled Plasma Mass Spectrometry, indicating potential for preg-robbing by clays and carbon. Preg-robbing is a process that prevents some of the gold from being recovered, making extraction less effective.

  • A Study of the Modes of Gold Loss in the Calcium

    The evermore increasing complexity of gold ores is forcing operations to seek alternative gold leaching reagents to the traditional use of cyanidation. At the Barrick Goldstrike mine, the implementation of a non-toxic thiosulfate leaching process is about to become an industrial reality. With modification to the existing infrastructure and leaching circuit, this new process allows for the

  • Gold extraction QueensMineDesignWiki

    The preg-robbing component can be carbonaceous matter, such as organic carbon or other impurities which will adsorb the gold. Sulphides and clays can also cause preg-robbing. For carbonaceous preg-robbing components, the ore must be treated with chlorine, bacteria, oil or roasted to stop preg-robbing behavior prior to leaching.

  • Speciation and quantification of surface gold in

    Jan 19, 2011· Gold recovery can be adversely affected by preg‐robbing on inherent carbonaceous material during autoclave pressure oxidation of sulphide ores. The time of flight (TOF) SIMS (TOF‐SIMS) technique has been applied for direct determination of gold species on individual carbonaceous particulates from AC POX stream samples.