• MICROBIAL PRETREATMENT OF DOUBLE REFRACTORY GOLD ORES

    of double refractory gold ores and concentrates. Currently numerous studies are in progress to further improve upon the efficiency of the bacterial process and to investigate the potential of other microorganisms. In this study, microbial pretreatment of double refractory gold ore (sample A) and

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  • ACID OXIDATION PRETREATMENT OF REFRACTORY GOLD ORE .

    A process for recovering gold from refractory auri ferous ironcontaining suiphidic ore comprising: feeding ground ore as an aqueous slurry to an acidic pretreatment step, treating the ground ore in the acidic pretreatment step with aqueous sulphuric acid solution to decompose car bonate and acid consuming gangue compounds which might other wise inhibit a subsequent pressure oxidation step ...

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  • Sequential pretreatment of double refractory gold ore ...

    Double refractory gold ore was sequentially pretreated to oxidize sulfides by thermophilic archaeon Acidianus brierleyi and then to decompose carbonaceous matters using the cellfree spent medium (CFSM)from whiterot fungus Phanerochaete chrysosporium. The pretreatment by A. brierleyi significantly improved the gold recovery from 25% to 77%.

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  • Mineralogical factors affecting the extraction of gold in ...

    For refractory gold ore processing, pretreatment technologies, such as finegrinding, autoclaving, roasting and biooxidation will also be required. The reason for using different process flowsheet is mainly because gold often occurs in different forms and minerals, and each ore has to be treated differently. Mineralogically, gold is classified ...

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  • refractory gold ore crushing process

    Microbial Pretreatment of Refractory Gold Ore Xinhai For coarse grain size of gold after crushing and grinding by flotation, gravity concentration, cyanide leaching process or several process combined treatment will be able to complete the separation of gold and gangue minerals, but there are some curing refractory gold ores due to coarse size or thin and gangue minerals symbiosis ...

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  • A SURVEY OF CONVENTIONAL AND NOVEL PROCESSES FOR THE ...

    what is known about the causes of gold retention by ores and reports the stateoftheart of refractory gold ore treatments. In 1986, Dry and Coetzee concluded "at present the choice of a particular process route for the recovery of gold from any given refractory .

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  • Pretreatment Of Refractory Ores In Gold Leaching Process Congo

    Pretreatment Of Refractory Ores Prior To Gold Leaching ... Pretreatment Of Refractory Ores Prior To Gold Leaching ... The most common leaching process for gold dissolution involves cyanidation, a process that has ...

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  • GOLD RECOVERY OF REFRACTORY SULFIDE CONCENTRATES .

    reagent on cyanidation of refractory gold ore. Cyanide leaching of the concentrate was performed at 20%w/w of solid (500 gram of refractory sulfide gold ore concentrate) in a glass reactor with aeration and stirred at 250 rpm. Leach solutions were prepared using deionizeddistilled water at the prescribed concentration of reagents.

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  • Options to Treat Refractory Ores

    Refractory gold ores are those that do not yield high gold recoveries in conventional cyanideleaching circuits, even when ... different methods of pretreatment were prepared and these estimated costs and ore sulfide grades then used to compare the process economics.

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  • Method for PreTreatment of GoldBearing Oxide Ores ...

     · Fine carbon can be added separately or interground with the ore. TABLE 4 % Gold Test # Test Description Extraction 1 CIL cyanide leaching 2 Thiosulfate leaching 3 Pretreatment of 150 g ore with 75 g coarse activated carbon, followed by thiosulfate leaching 4 Pretreatment of 150 g ore with g ground activated carbon ...

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  • Enhanced Leaching of Arsenopyrite Concentrates as a ...

     · Enhanced Leaching of Arsenopyrite Concentrates as a Pretreatment for Gold Recovery from Refractory Ores Published on April 20, 2017 April 20, 2017 • 6 Likes • 0 Comments

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  • (PDF) Mineralogy and Pretreatment of a Refractory Gold ...

     · refractory gold ore whether it was gravity separation alone or flotation alone. ... combined beneficiation process was used to pretreat the refractory gold deposit, and the coarse.

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  • GLOBAL EXPLOITATION OF HEAP LEACHABLE GOLD DEPOSITS: II ...

    Bioheap pretreatment of sulfidic refractory gold ore prior to cyanide leaching is a promising new technology, especially for lowgrade ores that cannot be oxidized by pressure leaching or roasting. Ores containing both refractory and amenable gold require economic decisions whether, or not, to pretreat before cyanide leaching.

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  • MODELING OF HIGH PRESSURE PRETREATMENT PROCESS FOR GOLD ...

    Keywords: pretreatment process, pressure oxidation, refractory gold ore and concentrate, leaching, modeling Investigation of high pressure pretreatment process for gold leaching is the objective of the present master's thesis. The gold ores and concentrates which cannot be easily treated by leaching process are called "refractory".

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  • USA1

    The present invention is directed to recovery of gold from refractory and double refractory ores using a fungal agent and/or culture media. USA1 Microbial pretreatment of double refractory gold ores Google Patents Microbial pretreatment of double refractory gold ores Download PDF Info Publiion number ...

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  • Complete process and equipment solutions for refractory ...

     · The current high gold price is increasing the focus on the development of refractory gold ores and concentrates. Outotec can deliver the three main oxidative processes for the treatment of refractory gold concentrates – BIOX, pressure oxidation, and roasting – and also supply equipment for ultrafine grinding as a fourth, nonoxidative treatment option.

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  • A SURVEY OF CONVENTIONAL AND NOVEL PROCESSES FOR THE ...

    what is known about the causes of gold retention by ores and reports the stateoftheart of refractory gold ore treatments. In 1986, Dry and Coetzee concluded "at present the choice of a particular process route for the recovery of gold from any given refractory ore .

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  • SIMULTANEOUS BIOTRANSFORMATION OF CARBONACEOUS .

    Double refractory gold ores (DRGO) contain metal sulfides that encapsulate gold and prevent its dissolution by cyanide, and carbonaceous matter (CM) that adsorbs gold cyanide complex. Pretreatment is therefore required to decompose the sulfides and liberate gold before cyanidation, and

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  • mining refractory gold ores treatment

    Cyanidation of Refractory Gold Ores: A Review PDF Download . Directions for future research in processing refractory gold ores has been stated. Gold Ores: A. Review, 3rd UMaT Biennial International Mining and Mineral Conference, pp204. Abstract polylemma associated with treating refractory ores. Chat

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  • © University of Science and Technology Beijing and ...

    refractory gold ore for increasing the leaching rate [57]. In the existing technical conditions, pretreatment of refractory gold ore is usually carried out by calcination, wet chemical, pressurized oxidation and biological

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  • Effect of Pretreatment of Sulfide Refractory Concentrate ...

    For extraction of gold from refractory ores or concentrate, in which gold is surrounded or covered by iron sulfide minerals, mainly arsenopyrite and pyrite, mineral oxidative pretreatment is essential to oxidize sulfides and to expose gold to the leaching solution.

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