of refractory sulphide gold ores and concentrates

  • Pressure Oxidation of a Refractory Sulfide Concentrate and ...

    Aug 11, 2018 · Pressure oxidation of the refractory sulfide/carbonaceous ores has gained world-wide acceptance. Compared with roasting, pressure oxidation yields

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  • Refractory Gold Ore Treatment Methods

    Jul 14, 2016 · Cyanidation and concentration of gold and silver ores List Gold Refractory Process Methods The use of roasting for the oxidation of sulfides has

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  • Refractory Gold Technology

    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 minerals, such as pyrite and/or arsenopyrite, unavailable for recovery by conventional leaching. In Sherritt’s gold process, the ...

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  • Recovery of gold from sulfide refractory gold ore ...

    Apr 01, 2021 · The major chemical components of the sulfide refractory gold ore and pyrite are shown in Table 2. The sulfide refractory gold ore (SRGO) contains 30.34% Fe, 22.23% S, 11.19% As, 3.24% Al and 60.25 g/t Au. The total content of Fe, As and S is up to 63% of the sulfide refractory gold ore. The pyrite contains 43.36% Fe and 41.26% S.

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  • Gold Extraction from Refractory Sulfide Gold Concentrates ...

    Aug 25, 2021 · Rees K, van Deventer J (2000) Preg-robbing phenomena in the cyanidation of sulphide gold ores. Hydrometallurgy 58:61–80. CAS Article Google Scholar 8. Suratman S (2017) Gold recovery of refractory sulfide concentrates using direct cyanide leaching with nitrite as

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  • (PDF) Gold recovery of refractory sulfide concentrates ...

    20%-w/w of solid (500 gram of refractory sulfide gold ore c oncentrate) in a 2.5-liter glass reactor with aeration and stirred at 250 rpm. Leach solutions were prepa red using deionized-distilled ...

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  • Recovery of gold from sulfide refractory gold ore ...

    Apr 01, 2021 · Sulfide gold ores account for a large proportion of refractory gold ores, therefore, it is very meaningful to recover gold from sulfide gold ores (Ubaldini and Vegliò, 2000, Saba, 2011, Hammerschmidt, 2016). Moreover, the major gold leaching process for extracting gold from ores and concentrates is still cyanide leaching.

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  • GOLD RECOVERY OF REFRACTORY SULFIDE

    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 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.

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  • PRESSURE OXIDATION OF REFRACTORY GOLD ORES: THE

    Pressure oxidation is employed to liberate gold and silver in refractory sulfide concentrates often and ores. The main pressure oxidation products from iron sulfide minerals are sulfuric acid (and metal sulfates) and hematite. Depending on the conditions within the

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  • Mineralogy and Pretreatment of a Refractory Gold Deposit ...

    The grade and recovery of gold in the flotation concentrates were 49.44 g/t and 33.36%, respectively. The total recovery of gold was 90.94%. The gravity–flotation combined beneficiation pretreatment process provided a feasible method for the refractory gold ore and ensured the effective recovery of

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  • (PDF) Biooxidation of sulfidic refractory gold ores ...

    Biooxidation of sulfidic refractory gold ores Rupert Kirchner, BSc Paper conducted in November 2015 Abstract The past years have confirmed that Biooxidation is a viable technology which is used commercially to treat certain refractory sulfide gold concentrates. There are several processes applied to achieve the oxidation of the sulfidic ...

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  • Gold Ore Roasting Techniques

    Jul 14, 2016 · A comprehensive description of roasting practice is to be found in a series of articles entitled “Roasting Gold-Silver Sulphide Ores and Concentrates” by M. W. von Bernewitz. A more recent paper, “ Roasting of Arsenical Gold Ores and Concentrates” by F. R. Archibald contains a bibliography listing 23 references on the subject of ...

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  • Gold extraction - Wikipedia

    Gold extraction refers to the processes required to extract gold from its ores.This may require a combination of comminution, mineral processing, hydrometallurgical, and pyrometallurgical processes to be performed on the ore.. Gold mining from alluvium ores was once achieved by techniques associated with placer mining such as simple gold panning and sluicing, resulting in direct recovery of ...

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  • Flexicone technology for sulfide ores | flexicone

    FLEXICONE processing technology of refractory ores and concentrates. Our latest advance is cyanide-free technology with 100% gold recovery. For the processing of gold-bearing refractory and sulphide ores and concentrates, Flexicone has developed a unique beneficiation technology.

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  • US4559209A - Leaching refractory gold ores - Google Patents

    A method is disclosed for leaching a gold ore which is refractory due to the presence of sulphide minerals of arsenic and antimony. The ground ore is leached with cyanide in a pipe reactor at a pressure of between 5 and 8 MPa. The terminal pH value of the pulp is controlled to be 10 or less than 10.

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  • Bioleaching of Gold Ore Example | GraduateWay

    Feb 04, 2018 · Bioleaching has been applied to copper and uranium deposits for many years, but more recently has been applied to gold ore refractory and refractory concentrates. This process involves the oxidation of sulfide, ferrous, and sometimes carbon containing minerals in

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  • refractory gold ore processing methods ozone

    Gold recovery: Effect of ozonation on refractory gold ores . Mineral processing of refractory gold ore is uneconomical through conventional processing methods The ore recovery is normally below 80% due to sulphide encapsulated gold and result into high reagent consumption by carbonates This study was conducted to investigate the use of ozone to the existing pretreatment processes to increase ...

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  • An Integrated Biotechnological Approach to Gold Processing

    Jul 05, 2020 · Gold miners are facing a reserves crisis, and what is left in the ground is becoming more and more challenging to process. Refractory gold reserves, which require more sophisticated treatment methods in order to achieve oxide-ore recovery rates, correspond to 24 percent of current gold reserves and 22 percent of gold resources worldwide ...

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  • Gold Extraction from Refractory Sulfide Gold Concentrates ...

    Aug 25, 2021 · Rees K, van Deventer J (2000) Preg-robbing phenomena in the cyanidation of sulphide gold ores. Hydrometallurgy 58:61–80. CAS Article Google Scholar 8. Suratman S (2017) Gold recovery of refractory sulfide concentrates using direct cyanide leaching with nitrite as

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  • GOLD RECOVERY OF REFRACTORY SULFIDE

    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 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.

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  • Methods of Processing of the Gold-Containing Refractory ...

    Methods of Processing the Gold-Containing Refractory Sulfide Ores and the Concentrates 69 Bull. Georg. Natl. Acad. Sci., vol. 11, no. 1, 2017 results of the study showed [6] that a high degree of extraction of precious metals is achieved after pre-oxidizing roasting of the residues at temperatures of 600 – 7000C for 1 hour, after which the ...

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  • WO2014056034A1 - Gold recovery from refractory ores and ...

    A method for recovery of gold from a gold-containing, refractory pyrite-rich ore or concentrate is disclosed. The method results in the production of a high grade, gold-containing solid intermediate concentrate. One embodiment comprises the steps of treating gold-containing material (100) rich in pyrite, arseno-pyrite or other iron sulphide to yield a gold-containing refractory concentrate ...

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  • Types of refractory gold deposits - Fodamon Machinery

    It is also called refractory gold ore or refractory gold ore. According to the different reasons for its difficulty, it can be divided into the following three categories. (1) Wrapped gold deposit. In this kind of gold ore, gold is wrapped in arsenopyrite, pyrite, arsenopyrite, chalcopyrite, pyrrhotite, galena, sphalerite and other sulfide ores ...

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  • Effect of Pretreatment of Sulfide Refractory Concentrate ...

    Keywords: Refractory Gold Concentrate; Hypochlorite Ox idation Pretreatment; Pressure Cyanidation . 1. Introduction . 1.1. Background . Many of the gold deposits contain finely disseminated gold in iron sulfide minerals such as pyrite and arsenopy- rite. Such deposits are called refractory gold ores due to

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  • Atmospheric alkaline pre-oxidation of refractory sulphide ...

    Atmospheric alkaline pre-oxidation of refractory sulphide gold ores. Creator. Rego, Alan Joseph. Publisher. University of British Columbia. Date Issued. 2018. Description. Four iron-sulphide-containing gold ores from the White Mountain mine in the Jilin Province, China were studied to examine the benefits of using oxidative treatment prior to ...

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  • Sulphide Gold Ore Treatment by Leaching and Flotation Process

    Apr 18, 2016 · Problem with gold recovery from sulphide ore: How may a mill get the maximum recovery of gold from a sulphide ore, at the least capital cost and at the same time obtain the highest net return.This latter point is most important. In many cases a gold mill using an all-cyanide flowsheet with fine grinding of all the ore will report very low gold content in the tailings particularly on an ...

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  • Guides For High-sulfide Gold Processing

    Mar 17, 2020 · High sulfide gold ore refers to a certain gold ore with 20% -30% of gold wrapped by sulfide (mainly pyrite). Because most of the gold in high-sulfide gold ore exists in the form of sulfide-encapsulated gold, when using direct leaching process, the consumption of gold leaching agent and cost of gold leaching production will increase, and gold processing efficiency is not good.

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  • Mycohydrometallurgy: Biotransformation of double ...

    May 01, 2013 · 1.Introduction. Gold ores are termed double refractory when they contain both organic carbonaceous matter and sulfide minerals (Amankwah et al., 2005, Nyavor and Egiebor, 1992).In such ores, metal sulfides encapsulate fine gold particles and prevent direct contact between gold particles and leaching reagents, thus interfering with gold dissolution (Baako, 1972, Benzaazoua et al., 2007,

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  • (PDF) Leaching Kinetics of Sulfides from Refractory Gold ...

    Apr 22, 2019 · Maksim Tretiak. At present, the processing of refractory gold-arsenic sulphide concentrates is becoming more relevant due to the depletion of rich crude ore reserves. In

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  • Biooxidation of Refractory Gold Ores (The Geobiotics ...

    As free-milling oxide deposits are depleted on a world-wide scale, the mining companies capable of efficiently mining and processing both low- and high-grade refractory sulfide deposits will become industry leaders. This chapter addresses a new process for the biooxidation of refractory gold ores developed by GeoBiotics, Inc.

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  • The BIOX™ Process for the Treatment of Refractory Gold ...

    Biooxidation-thiourea (TU) leaching is considered to be a more environmentally friendly and efficient method than cyanidation to recover gold from refractory sulfide gold-bearing ores/concentrates.

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  • Oxidative pre-treatment in thiosulphate leaching of ...

    Feb 19, 2010 · Alymore (2001) reported that pre-treating ore by ultra fine milling or by roasting could improve gold extractions from a gold–copper sulphide concentrate under a less severe reagent condition. Barrick Co. also patented a process for recovering gold from an ore having a combination of refractory sulphide and carbonaceous material using ...

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