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Treatment Of Carbonaceous Refractory Gold Ores

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  • Microwave Pretreatment Of A Double Refractory Gold Ore

    Abstract Double refractory gold ores such as Barrick’s Goldstrike ore contain both pyrite and carbonaceous matter and the latter results in the loss of gold from solution during cyanide leaching One possible remedy is to roast the ore and thus oxidize the pyrite and remove the organic carbon In this research microwave roasting of a double refractory gold ore was

  • Pretreatment Of Refractory Ores In Gold Leaching Process

    Refractory carbonaceous sulfide ores are treated in a manner so as to improve gold recovery by a treatment in specific combination of steps whereby the ore is treated with chlorine after pretreatment and before cyanidation the particular steps in the treatment of the ore have been found to be necessary as the conventional pretreatment will not

  • Carbon In Chlorine Treatment Of Refractory Gold Ores Ausimm

    The U S Department of Interior Bureau of Mines is investigating the treatment of refractory gold ores Chlorination in the treatment of refractory gold ores is applicable in many low grade gold operations When usable this treatment provides an economic means of consuming sulfides and deactivating disseminated organic carbon Chlorination however is a

  • Gold Recovery From Refractory Carbonaceous Ores By

    A process for treatment of precious metal ores in which gold is leached from an oxidized ore slurry using a thiosulfate salt lixiviant and copper catalyst Gold and copper are subsequently loaded onto an ion exchange resin Copper is recovered from the resin by elution with a thiosulfate solution gold is recovered from the resin by elution with a thiocyanate colution

  • Recovery Of Gold From Carbonaceous Ores

    It is our discovery that pretreatment of carbonaceous ores at a temperature less than 70 C with an alkaline hypochlorite will prevent absorption of the complex by carbonaceous impurities and will for the first time allow an economical recovery of gold from carbonaceous ores Refractory gold ores have previously been treated with acid systems

  • Process For Treating Refractory Gold Ores By Roasting

    Recently the U S Bureau of Mines examined the recovery of gold by chlorination of refractory carbonaceous and sulfidic ores comparing various treatment methods in which a ground ore

  • Pretreatment Process On Refractory Gold Ores With As

    Gold ores are considered refractory if gold extractions from a conventional cyanidation process are less than 80 even after fine grinding 1) Arsenic bearing refractory gold ore has stones extremely difficult to deal with In the stones gold is locked up in arsenic mineral matrix as the form of microscopic or submicroscopic lattice

  • Pame Treatment Refractory Copper Ores

    Review Pretreatment Process on Refractory Gold Ores with As refractory gold ore bearing organic carbon 4 Bacterial Preoxidation The research of bacterial peroxidation is quite active The technology started to process ores in the 1950 s and at first leached to recovery copper from the lowgrade copper ore or marginal copper ore →

  • Bio Treatment Of Refractory Gold Ore In Obuasi Mines

    The Plant has seen a number of upgrades and modifications in its circuits which were motivated by cost operational and throughput constraints The objective of this paper is therefore to highlight the mine’s experience in the treatment of its complex carbonaceous refractory sulfide gold ores with emphasis on plant operations and improvements

  • Water Washing Of Fungal Treated Carbonaceous Ores:

    Specific characteristics of refractory gold ores play a vital role when considering an appropriate technique for processing these gold ores Bacterial oxidation of sulphide minerals is a familiar and commercially available process to enhance gold recovery with problem ores Microbial pre treatment of refractory carbonaceous gold ores are

  • Biooxidation Of Carbonaceous Refractory Gold Ores By An

    The Treatment of Refractory Gold Ores Containing Carbonaceous Material and Sulfides Gold and Silver Leaching Recovery and Economics W J Schlitt (1981) pp 17 22 Cited by

  • Ore Defects From Refractory

    Refractory Gold Ore Treatment Methods 2016 07 14 Metallurgical ContentGold Leaching Processing of Arsenic OreMispickel (Arsenopyrite FeAsS) 6Leaching and Recovering Gold from Antimony MineralsStibnite (Antimony Sulphide Sb2S2)Telluride Gold Ore ProcessingSolubility of TelluridesGold Extraction from Carbonaceous OreList Gold Refractory Process Methods Where gold

  • Gold Refractory Ore Classification Preprocessing Methods

    Classification of refractory ores 1 Carbonaceous gold ore There is organic carbon which can do ‘ Rob gold ’ in gold and silver ore and it causes that gold is adsorbed in the cyanide solution make ore difficult to cyanide and leach Generally we use roasting and chlorination pretreatment to destroy all or part carbon

  • Gold Recovery: Effect Of Ozonation On Refractory Gold

    2016) As free milling ores are depleting the focus has shifted to gold ores that do not yield economic recoveries after conventional cyanidation and these ores are classified as refractory ores An ore can be refractory due to (a) Preg robbing gold associated with organic carbon or carbonaceous material that

  • Process For Recovering Gold And Silver From Refractory Ores

    Sep 11 2008 Poor gold recovery from refractory ores is typically caused by the gold being occluded in sulfide mineral grains (usually pyrite and arsenopyrite grains) so that the gold cannot react with the cyanide leach solution or by cyanide dissolved gold being adsorbed by carbonaceous material present in the ore (this phenomenon is known as “preg

  • Diagnostic Leaching For Refractory Gold Ores Srk

    A diagnostic leach test can be very useful to qualitatively assess how gold occurs within the ore and the extent to which it may be refractory Several different permutations of diagnostic leach tests depend on specific objectives but they generally involve the sequential leaching of a gold ore sample with progressively stronger reagents

  • The Recovery Of Gold From Refractory Ores By The Use Of

    Recently the U S Bureau of Mines examined the recovery of gold by chlorination of refractory carbonaceous and sulfidic ores comparing various treatment methods in which a ground ore pulp is contacted with chlorine gas and activated carbon is added to the pulp for a carbon in chlorine leach (CICL) The objective of this research was to demonstrate the basic feasibility of

  • Method For Recovering Gold And Other Precious Metals From

    Carbonaceous ores vary significantly from deposit to deposit and even within deposits in the amount of carbonaceous matter they contain These ores have been reported to contain from approximately 0 2 carbon to as much as 5 carbon P Afenya Treatment of Carbonaceous Refractory Gold Ores Minerals Engineering Vol 4 pp 1043 1055 1991

  • The Process Mineralogy Of Gold: The Classification Of Ore

    The principal gold minerals that affect the processing of gold ores are native gold electrum Au Ag tellurides aurostibite maldonite and auricupride In addition submicroscopic (solid solution) gold principally in arsenopyrite and pyrite is also important The main causes of refractory gold ores are submicroscopic gold the Au Ag tellurides and very fine grained gold ( 10 m)

  • Technology Of Gold Recovery From Preg Robbing Ores Ausimm

    Due to treatment of refractory carbonaceous low grade gold ores a new technology providing improved precious metal recovery is required For this reason a technology including gravity flotation recleaning of the flotation concentrate intensive cyanidation of the gravity concentrate and carbon in leach (CIL) process for intensive cyanidation tailings and the recleaned

  • Refractory Gold Technology

    Application of pressure oxidation for refractory gold ore treatment at the McLaughlin Gold Complex in California commissioned in 1985 Refractory Gold Technology Sherritt’s Refractory Gold Technology is used to recover gold from refractory sulphide feedstocks Many gold ores and concentrates contain fine grained gold locked within sulphide

  • Gold Recovery 101 From Sepro's Gold Recovery Experts

    • Preg robbing – When the ore contains graphite or other carbonaceous matter the gold which often leaches well into solution is pulled out of the leach solution by the carbonaceous material Each of the factors that result in an ore being refractory require a pre treatment step before the ore can be treated by a conventional cyanidation

  • Biotechnological Approaches To Facilitate Gold Recovery

    Double refractory gold ore (DRGO) not only include ppt levels of gold grains locked in sulfide minerals but also a problematic amount of carbonaceous matter This causes a significant recovery loss of gold during cyanidation because of the strong affinity of the Au(CN)2 − with the carbonaceous matter Combustion decreases the carbonaceous matter content but also

  • 17 Flotation Of Gold Ores

    Refractory gold ores (autoclave biological decomposition followed by cyanidation) 3 A combination of pyrometallurgical (roasting) and hydrometallurgical route is used for highly refractory gold ores (carbonaceous sulphides arsenical gold ores) and the ores that contain impurities that result in high consumption of cyanide which have to

  • Alta Metbytes What's Happening In Gold Ore

    FLSmidth USA is developing the application of their mechano chemical pre treatment process to oxidize refractory sulphide gold ores and concentrates under atmospheric pressure without ultrafine grinding and at temperatures much lower than traditional roasting or autoclave pre treatment(14) 2019

  • Extraction Of Gold From A Low

    The treatment process of a low grade refractory gold ore containing sulfide minerals and carbonaceous matters was studied in this work The gold extraction of this ore by all sliming cyanidation was only 11 75 Hence a pretreatment was necessary In this paper a flotation preoxidation cyanide leaching process was developed

  • (pdf) Bacterial Leaching As A Pre

    The Bacterial Oxidation (BIOX) process for the pre treatment of refractory ores for gold recovery developed by Genmin the mining division of

  • Gold Mining Process Development – Denver Mineral Engineers

    Other ore types considered refractory include Carbonaceous ores that allow cyanide to dissolve gold but quickly adsorb gold back onto the active carbon in the ore Treatment processes include chlorination for carbon deactivation roasting to burn away carbon and carbon in leach which introduces competing high activity carbon to preferentially

  • (pdf) Bacterial Leaching As A Pre

    Such ores are known as refractory ores (Attia and El Zeky 1989) Various pre oxidation methods of refractory ores and concentrates are commonly used to improve precious metal recoveries For example oxidative roasting has been used in some cases as a