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fungal pretreatment of sulfides in refractory gold

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  • Review Pretreatment Process on Refractory Gold Ores with As

    Pretreatment Process on Refractory Gold Ores with As Xin-yuan NAN, Xin CAI* and Jun KONG School of Electrical Engineering, Xinjiang University, 1230 Yan''an Road, Tianshan District, Urumqi, 830047 P. R. China.

  • ‪Dr Grace Ofori-Sarpong‬

    Fungal pretreatment of sulfides in refractory gold ores G Ofori-Sarpong, K Osseo-Asare, M Tien Minerals Engineering 24 (6), 499-504, 2011 48 2011 Mycohydrometallurgy: Biotransformation of double refractory gold ores by the fungus, Phanerochaete G Ofori 45 ...

  • Pretreatment Process on Refractory Gold Ores with As

    2) The gold ores with As must be broken or decomposed in the gold particles scales, so that gold is fully exposed, and then extracted with the appropriate gold leaching agent. The process of crushing or decomposition before gold leaching is called pretreatment of refractory gold.

  • Refractory Gold Ore Treatment Methods

     · Gold Leaching & Processing of Arsenic Ore. Mispickel (Arsenopyrite: FeAsS).6. Leaching and Recovering Gold from Antimony Minerals. Stibnite (Antimony Sulphide, Sb2S2) Telluride Gold Ore Processing. Solubility of Tellurides. Gold Extraction from Carbonaceous Ore. List Gold Refractory Process Methods. Where gold is associated with arsenic ...

  • 10.1016/j.mineng.2011.02.020 | DeepDyve

     · The results demonstrate that the fungus, P. chrysosporium, is a potential microorganism for oxidative decomposition of metal sulfides associated with refractory gold ores. With improvement in system controls, higher levels of oxidation are feasible.

  • Fungal pretreatment of sulfides in refractory gold ores | Request PDF

    Request PDF | Fungal pretreatment of sulfides in refractory gold ores | This study assessed the capability of the fungus, Phanerochaete chrysosporium, to decompose pyrite, …

  • Effect of Pretreatment of Sulfide Refractory Concentrate with Sodium Hypochlorite, Followed by Extraction of Gold by Pressure Cyanidation, on Gold ...

    The majority of the refractory gold and silver occurs in occlusion in sulphides, then precious metal dissolution is possible by first oxidizing auriferous sulfide concentrate using sodium hypochlorite-sodium-hydroxide solution followed of pressure cyanidation of the ...

  • The Oxidation Pretreatment of a Sulfidic Refractory Gold Ore …

    Abstract. An attempt has been made to study the pretreatment of sulfidic refractory gold ore with pyrolusite. The influences of various parameters were …

  • Recovery of gold from refractory gold ores: Effect of pyrite on the stability of the thiourea leaching …

     · The extraction of gold from refractory gold ores (RGOs) without side reactions is an extremely promising endeavor. However, most RGOs contain large amounts of sulfide, such as pyrite. Thus, investigation of the influence of sulfide on the gold leaching process is important to maximize the utilization of RGOs. In this work, the effects of pyrite on the stability of the …

  • Preg-robbing of gold from cyanide and non-cyanide complexes: Effect of fungi pretreatment …

    Although gold grains could be liberated and/or not associated with sulfides, CM decreases the gold extraction during cyanidation through adsorption of gold cyanide complex, a …

  • GOLD RECOVERY OF REFRACTORY SULFIDE CONCENTRATES …

    20%-w/w of solid (500 gram of refractory sulfide gold ore concentrate) in a 2.5-liter glass reactor with aeration and stirred at 250 rpm. Leach solutions were prepared using deionized-distilled water at the prescribed concentration of reagents. Recovery of gold93.05 ...

  • 10.1016/j.mineng.2011.02.020 | DeepDyve

     · (3), where V is the volume of solution used in fungal incubation, C is the concentration of dissolved constituent as measured by ICP-AES, P m is the percentage of the constituent in the sulfide material and W is the mass of sulfide material used. Eq. (4) also

  • 、-《》

     · [12] Ofori Sarpong G,Osseo Asare K,Tien M. Fungal pretreatment of sulfides in refractory gold ores[J].Minerals Engineering,2011(24):499-504. [13],,,.-[J].,2012,36(6

  • Minerals | Free Full-Text | Significance of Acid Washing after Biooxidation of Sulfides in Sequential Biotreatment of Double Refractory Gold …

     · Environmentally friendly pretreatment of double refractory gold ores (DRGO) to improve gold recovery without emitting pollutant gas is challenging. Sequential biotreatment, including iron-oxidizing microorganisms to decompose sulfides, followed by the enzymatic decomposition of carbonaceous matter, was recently developed. The effect of acid washing by …

  • Two-Step Oxidation of Refractory Gold Concentrates with Different Microbial Communities …

    The oxidation rates of sulfide sulfur with moderate thermophiles were 93.94% and 65.73% when the pulp density was increased to 10% and 15%, respectively. All these results indicated that the two-step pretreatment increased the oxidation rate of refractory gold

  • Biotechnology for Environmentally Benign Gold Production | …

    Abstract Biotechnology relevant to gold exploration, mining, recovery, and waste disposal is illustrated with respect to microbiological aspects of gold mineralization, biooxidation of refractory sulfide ores and concentrates, cyanide-free gold dissolution, and biodegradation of cyanide containing effluents.

  • WO2009069005A2

    The present invention is directed to recovery of gold from refractory and double refractory ores using a fungal agent and/or culture media. The fungal agent is inoculated in the feed material to either decompose sulfide sulfur or deactivate preg robbing carbon The culture media is applied, m the absence of a microbe, to decompose some sulfide sulfur and release a portion of the …

  • Sequential pretreatment of double refractory gold ore (DRGO)with a thermophilic iron oxidizing archeaon and fungal …

    The pretreatment by A. brierleyi significantly improved the gold recovery from 25% to 77%. Additionally, the crude lignin-degrading enzymes in the CFSM converted the carbonaceous matters into more easily degradable substances, which were removed by alkaline washing, leading to a final gold recovery of 92%.

  • Recovery of gold from sulfide refractory gold ore: Oxidation roasting pretreatment and gold …

    In this study, A novel method for gold recovery from refractory gold ore was proposed with the purpose of improving recovery efficiency of gold and reducing environmental pollution. The method consisted of two stages roasting for arsenic and sulfur removal, gold recovery by thiourea leaching, followed by an enhanced chlorination roasting for gold recovery in the presence of …

  • US20090158893A1

    The present invention is directed to recovery of gold from refractory and double refractory ores using a fungal agent and/or culture media. US20090158893A1 - Microbial pre-treatment of double refractory gold ores - Google Patents Microbial pre Info ...

  • Ming Tien | The Huck Institutes

    Fungal pretreatment of sulfides in refractory gold ores G. Ofori-Sarpong, K. Osseo-Asare, M. Tien, 2011, Minerals Engineering on p. 499-504

  • Process for treating refractory gold ores by roasting under …

     · Microscopic gold inclusions in sulfide minerals cannot typically be extracted by conventional cyanidation. The gold ore must be pretreated to oxidize sulfide minerals associated with gold and to remove other minerals and chemical compounds that interfere in the cyanidation leaching process. The recovery of gold from refractory sulfidic-carbonaceous ores after …

  • Sequential pretreatment of double refractory gold ore (DRGO) …

     · Fungal pretreatment of sulfides in refractory gold ores Miner. Eng., 24 (2011), pp. 499-504, 10.1016/j.mineng.2011.02.020 Article Download PDF View Record in …

  • Biotechnological Approaches to Facilitate Gold Recovery from Double Refractory Gold …

     · 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 …

  • Sequential pretreatment of double refractory gold ore (DRGO) with a thermophilic iron oxidizing archeaon and fungal …

     · This study was therefore aimed at investigating the ability of the CM-deactivating fungus, P. chrysosporium, to also solubilize/oxidize sulfides found in refractory gold ores so as to assess the potential of a single-stage process for the pretreatment of double 2. 2.1.

  • Aeration pretreatment of low grade refractory gold ores | …

     · Aeration curing, over a long duration in wetted stockpiles, shows promise as an affordable pretreatment method for oxidizing gold encapsulating sulfide minerals, and possibly organic matter, in low grade refractory ores. Following aeration pretreatment, the ore is reclaimed, neutralized, and cyanide leached by conventional practices. Large tonnages of …

  • Mycohydrometallurgy: Biotransformation of double refractory …

     · Double refractory gold ores require pretreatment before gold cyanidation. • Single-stage biotreatment of double refractory gold ore (DRGO) is yet to be a success. • P. chrysosporium simultaneously biotransformed sulfides and carbonaceous matter. Gold recovery

  • Fungal pretreatment of sulfides in refractory gold ores — Penn State

     · title = "Fungal pretreatment of sulfides in refractory gold ores", abstract = "This study assessed the capability of the fungus, Phanerochaete chrysosporium, to decompose pyrite, arsenopyrite and a sulfide-containing flotation concentrate in an effort to develop a microbial process for pretreating refractory gold ores.

  • Fungal pretreatment of sulfides in refractory gold ores

    Research highlights Encapsulation of fine gold particles in sulfide matrix limits gold dissolution. Decomposition of sulfides is required to liberate encapsulated gold grains. Phanerochaete chrysosporium was investigated for its ability to decompose sulfides. P. chrysosporium was effective in decomposing sulfides. The results demonstrate a promising alternative …

  • Pretreatment Process on Refractory Gold Ores with As

    General process options for pretreating refractory gold ores. 2. Roasting Oxidation Pretreatment. So far, the application of roasting oxidation pretreatment has a history of 70 years. The principle is to destroy the ores tissue to make gold exposed by the means of roasting the flotation concentrate.

  • Pretreatment of Refractory Gold Ores Using Cell-Free Extracts of …

    Fungal pretreatment of sulfides in refractory gold ores Article May 2011 MINER ENG Grace Ofori-Sarpong K. Osseo-Asare Ming Tien This study assessed the capability of the fungus, Phanerochaete ...

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