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Fungal pretreatment of sulfides in refractory gold ores ...

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 …

refractory gold pretreatmentbing

microwave pretreatment of a refractory gold Know More refractory gold ore milling in oregon atithipalacein, microwave pretreatment of a double refracto. Inquire Now; Pre-treatment of a refractory gold sulfide ore by means . Latin American applied research ... as pre-treatment of refractory gold ores is based on the ability of acidophilic ...

Pressure Oxidation of a Refractory Sulfide Concentrate and ...

 · These types of ores are generally not amenable to cyanidation and require destruction of sulfide matrix by pretreatment methods (Jha, 1987). In addition to sulfides, carbonaceous material present in certain gold ores may also contribute to refractoriness. Gold associations with orpiment and realgar are rather rare.

Enzymatic Pre-Treatment of Carbonaceous Matter in Preg ...

The bio-treatment of double refractory gold ores (DRGO) to reduce preg-robbing needs to account for the heterogeneity of the ore so as to acquire a much more complete picture of the system. To this end, the effects of ferrous ion additives on the degradation of powdered activated carbon (PAC) by cell-free spent medium (CFSM) was studied. Au(CN)2- adsorption and Raman spectrometric results ...

UMaT

Ofori-Sarpong, G, Osseo-Asare K., and Tien, M.(2011), Fungal pretreatment of sulfides in refractory gold ores Minerals Engineering, 24 0 499-504 Amankwah, R K and Ofori-Sarpong, G(2011), Microwave heating of gold ores for enhanced grindability and cyanide amenability Minerals Engineering, 24 6 …

CA2705487A1

The present invention is directed to recovery of gold from refractory and double refractory ores using a fungal agent and/or culture media. CA2705487A1 - Microbial pre-treatment of double refractory gold ores - Google Patents Microbial pre-treatment of double refractory gold …

Screening of Important Variables of Organic Acids ...

In this study, the important variables of organic acids degradation with Phanerochaete chrysosporium were selected in refractory arsenic-bearing and carbonaceous gold ores. The eight variables of fungal degradation of carbonaceous matter were confirmed by the previous single factor experiments, which were guaiacol concentration, dextrin concentration, tween-80 concentration, oxalic acid ...

Fungal Modification of Carbonaceous Matter and Sulfides in ...

 · Gold ores can be classified broadly as non-refractory (alluvial and free-milling) and refractory from a metallurgical standpoint depending on the mineralogy and the ease of gold extraction. The major problem of refractoriness centres on the presence of sulfides and/or carbonaceous matter. In sulfidic refractory gold ores, tiny gold particles may be highly disseminated and locked up within the ...

Two-Step Oxidation of Refractory Gold Concentrates with ...

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 concentrates and is a potential technology to pretreat the refractory sample.

Sequential pretreatment of double refractory gold ore ...

Request PDF | On Jul 1, 2019, Kojo T. Konadu and others published Sequential pretreatment of double refractory gold ore (DRGO) with a thermophilic iron oxidizing archeaon and fungal crude enzymes ...

US20090158893A1

US20090158893A1 US12/277,046 US27704608A US2009158893A1 US 20090158893 A1 US20090158893 A1 US 20090158893A1 US 27704608 A US27704608 A US 27704608A US 2009158893 A1 US2009158893 A1 US 2009158893A1 Authority US United States Prior art keywords feed gold carbon fungal agent component Prior art date 2007-11-28 Legal status (The legal status is …

PAPER OPEN ACCESS Biooxidation pretreatment of low …

Biooxidation pretreatment of low grade refractory gold tailings using a sulfur-oxidizing mixotrophic bacterium ... diameter) and are included in carbonaceous minerals, sulfides, tellurides, and cyanicides. With the presence of these minerals, the cyanidation process becomes ineffective and tends to reduce gold ... 5 g/L yeast extract, and 10 g ...

Microbial oxidation of refractory gold sulfide concentrate ...

Refractory gold-bearing ores are characterized by containing submicroscopic gold particles occluded in sulfide minerals such as pyrite and arsenopyrite. Under these conditions, gold cannot be recovered efficiently without an oxidative pretreatment such as roasting, …

Mineralogy and Pretreatment of a Refractory Gold Deposit ...

The best pretreatment process is ultimately determined by the geological formation process and mineralogy of the gold deposit [10,11,12,13] general, liberated native gold is recovered by low cost gravity separation, especially for coarse gold [14,15] mon gravity separation equipment includes shaking table, spiral chute, and jigging concentrator.

Pretreatment Process on Refractory Gold Ores with As

The process of crushing or decomposition before gold leaching is called pretreatment of refractory gold. Statistics show that, in the world, about 2/3 gold resource belongs to the difficult processing ores, and about 1/3 total output of world gold is produced from refractory gold. This proportion will further increase in future.

Carbon-in-Leach Gold Recovery from Fungi-treated ...

 · The ability of the fungus, Phanerochaete chrysosporium to reduce preg-robbing of carbonaceous matter (CM) in gold ores has been confirmed by many researchers, and studies are ongoing to minimize the effect of entrained biomass on subsequent gold leaching and adsorption processes. This paper presents a study on gold extraction from surrogate carbonaceous gold ore (CGO), and fungal …

Fungal pretreatment of sulfides in refractory gold ores

Fungal pretreatment of sulfides in refractory gold ores G. Ofori-Sarponga,⇑, K. Osseo-Asarea,b, M. Tienc a Department of Energy and Mineral Engineering, Penn State University, University Park, PA 16802, USA bDepartment of Materials Science and Engineering, Penn State University, University Park, PA 16802, USA cDepartment of Biochemistry and Molecular Biology, Penn State University ...

MICROBIAL PRE-TREATMENT OF DOUBLE REFRACTORY …

The result of the novel microbial pre-treatment process indicated that sulfide sulfur was degraded under alkaline conditions and carbonaceous matter passivated by T. versicolor at its optimum growth conditions. This led to a significant improvement in gold extraction from the double refractory gold ore and concentrate investigated.

Pretreatment of Refractory Gold Ores Using Cell-Free ...

Recovery of Zinc during the Pre-Treatment of a Refractory Gold-Bearing Ore ... Fungal pretreatment of sulfides in refractory gold ores, Minerals Engineering, 24, 499–504. DOI: 10.1016/j.mineng.2011.02.020 [4] Ofori-Sarpong, G., Tien, M., Osseo-Asare, K. 2010. Myco-hydrometallurgy: Coal model for potential reduction of preg-robbing capacity of ...

Refractory Gold Ore Treatment Methods

 · At the plant of the Consolidated Murchison Co. in the Transvaal, South Africa, where a refractory high-antimony gold ore is being treated, flotation and cyanidation of the flotation concentrates and tailings are being practiced. The association of the antimony and gold is very intimate, and during 1946, while the antimony recovery amounted to ...

Review Pretreatment Process on Refractory Gold Ores with As

mainly about the refractory gold leaching easily through arsenic removal to expose gold, changing the composition, physic-chemical and electro-chemical properties of the ore. Currently, there are four main methods of pretreatments of refractory gold ores with As. Pretreatment options for deal-ing with refractory gold ores are illustrated in Fig ...

Minerals Engineering International Online

Minerals Engineering International: Metallic Ores: Gold. Haoyu Li, Jinhui Peng, Pengcheng Ma, Zhufen Zhou, Hailin Long, Shiwei Li, Libo Zhang, Application of diagnostic roasting method in thermochemical treatment for Au recovery from gold-containing tailings in microwave field, Minerals Engineering, Vol. 163, 2021 Diego M. Mendoza, Kojo T. Konadu, Yuji Aoki, Misato Kameya, Keiko Sasaki ...

MODELING OF HIGH PRESSURE PRETREATMENT PROCESS …

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".

Biotransformation of Arsenopyrite by Phanerochaete ...

Abstract. In this study, the arsenopyrite was used as representative of gold-bearing sulfides in Carlin-Type gold ores to test the ability of oxidation on them by P. chrysosporium. After shaking incubation for 20 days, the conversion rates of iron, sulfur and arsenic in arsenopyrite were 6.28%, 35% and 21.76%, which were 44.86, 2.98 and 48.36 times compared with the asepsis system, respectively.

Biological pretreatment of carbonaceous matter in double ...

 · The pretreatment of carbonaceous material in double refractory gold ores (DRGO) is necessary to decrease preg-robbing of gold and maximize gold recovery. DRGO contains of carbonaceous matter and gold grains encapsulated in sulfide minerals, which typically results in very poor gold recovery.

The Oxidation Pretreatment of a Sulfidic Refractory Gold ...

Various quantities of sodium nitrite in solution ( For gold can be dissolved into aurocyanide anion from refractory sulfide gold ore, the sulfide minerals as host of minerals must be decomposed first.

Recovery of gold from refractory gold ores: Effect of ...

 · 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 thiourea system were ...

Process for treating refractory gold ores by roasting ...

 · 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 roasting pretreatment …

Fungal Modification Of Carbonaceous Matter and Sulfides in ...

Fungal Modification Of Carbonaceous Matter and Sulfides in Gold Ores: Amazon.es: Ofori-Sarpong, Grace: Libros en idiomas extranjeros Selecciona Tus Preferencias de Cookies Utilizamos cookies y herramientas similares para mejorar tu experiencia de compra, prestar nuestros servicios, entender cómo los utilizas para poder mejorarlos, y para ...

Mycohydrometallurgy: Biotransformation of double ...

 · 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 increased substantially after fungal treatment. •

Fungal Modification Of Carbonaceous Matter and Sulfides in ...

Fungal Modification Of Carbonaceous Matter and Sulfides in Gold Ores | Ofori-Sarpong, Grace | ISBN: 9783639702149 | Kostenloser Versand für alle Bücher mit Versand und Verkauf duch Amazon.

Fungal pretreatment of sulfides in refractory gold ores ...

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

Pretreatment of Refractory Gold Ores Using Cell-Free ...

Request PDF | Pretreatment of Refractory Gold Ores Using Cell-Free Extracts of P. chrysosporium : A Preliminary Study | The fungus Phanerochaete chrysosporium has been proven to biotransform ...

Effect of Pretreatment of Sulfide Refractory Concentrate ...

gold in iron sulfide minerals such as pyrite and arsenopy- rite. Such deposits are called refractory gold ores due to the encapsulation of fine particles of gold in the ore host. A clear boundary between refractory and non-refractory ore in terms of gold recovery is not well defined, but several authors have pointed out that less than 60% gold

10.1016/j.mineng.2011.02.020 | DeepDyve

 · Also, the diffractometer used for the study had a detection limit of 5%, and thus any phase with less than 5 wt.% composition may not show a peak on the diffractogram.

The presence of the oxidation products indicates clearly that P. chrysosporium has the ability to transform sulfides in refractory gold ores.