Pretreatment Of Refractory Sulphide Gold Ores And Concentrates

  • 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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  • Gold processing - Mining and concentrating | Britannica

    Gold processing - Gold processing - Mining and concentrating: The nature of the ore deposit determines the mining and mineral processing techniques applied. Oxide ore deposits are frequently of such low grade (e.g., 3 to 10 parts per million) that extensive mineral processing cannot economically be justified. In this case they are merely shattered by explosives and then piled into heaps for ...

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

    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 conventional cyanidation to leach gold. This pre-treatment consisted of bubbling air into an ore/water mixture for eight hours while adding enough caustic sodium hydroxide to maintain a pH of 11 …

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  • pretreatment of refractory ores in gold leaching process congo

    Processing technologies for gold-telluride ores | SpringerLink. This study deals with provided that gold is coarse enough to the alkaline sulfide leaching as an Gold ores are commonly classi- be physically and economically liber- alternative pretreatment method fied as free-milling and refractory for antimonial refractory gold and ated. ores based on the metallurgical per- silver bearing ores.

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  • pressure oxidation refractory gold - Hitlers Hollywood

    pressure oxidation refractory gold. Pressure Oxidation 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 autoclave acid containing iron compounds can be formed

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  • Optimizing the alkaline oxidation pretreatment of a ...

    Sep 28, 2018· Sodium hydroxide was used for pretreatment of the refractory gold–silver ore from the Akoluk deposit. The alkaline pretreatment process significantly improved the gold recovery from 49.3% to 85.4%. Hasab et al : Combining sulfide oxidation and gold leaching using chloride/hypochlorite solution

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  • US4923510A - Treatment of refractory carbonaceous sulfide ...

    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 improve the yields on any …

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  • ALTA MetBytes - What's Happening in Gold Ore Processing

    FL, 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. . .

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  • Process for recovering gold and silver from refractory ores

    Sep 11, 2008· Referring to FIG. 6, it can be seen that gold recovery and concentrate grade (sulfide sulfur) is superior for the conventional process at concentrate grades less than about 4% sulfur but superior for the MCF2 process at concentrate grades higher than about 4% sulfur.At a target concentrate grade of 7% S or greater, the MCF2 process showed approximately 2% higher Au …

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  • Extraction of Gold from a Low-Grade Double Refractory Gold ...

    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.

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  • recovery of gold from refractory ores zimbabwe

    These refractory ores require pre-treatment in order for cyanidation to be effective in recovery of the gold. An acidic pressure oxidation pre-treatment of . Pre-treatment of refractory gold concentrates 865 Roasting and cyanidation The roasting tests were carried out to confirm the gold recovery values obtained at the Roasting Plant.

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  • ECONOMICS OF REFRACTORY GOLD ORE PROCESSES

    ECONOMICS OF REFRACTORY GOLD ORE PROCESSES John E. Litz and R. Wayne Carter 119th TMS Annual Meeting February 18-22, 1990 Hazen Research, Inc. 4601 Indiana Street Golden, Colorado 80403 Abstract Refractory gold ore pretreatment processes continue to receive much attention. This

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  • TECHNICAL SESSION 2b: Pre-oxidation of refractory ores 1

    Sep 11, 2019· Experienced and resourceful extractive Metallurgical Engineer, with 25 years experience both in academia and production. Currently provides metallurgical support to operations and projects, in the Kibali Processing Plant that has a unique gold processing circuit with both generic free milling ores treatment and a suite of more complex sulphide ores that retain a degree of refractoriness.

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  • Sequential pretreatment of double refractory gold ore ...

    Jul 01, 2019· Double refractory gold ore was sequentially pretreated to oxidize sulfides by thermophilic archaeon Acidianus brierleyi and then to decompose carbonaceous matters using the cell-free spent medium (CFSM) from white-rot fungus Phanerochaete chrysosporium.The pretreatment by A. brierleyi significantly improved the gold recovery from 25% to 77%. . …

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  • 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].In general, liberated native gold is recovered by low cost gravity separation, especially for coarse gold [14,15].Common gravity separation equipment includes shaking table, spiral chute, and jigging concentrator.

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  • Lowering the Threshold for Refractory Gold Deposits with N.

    Figure 2 shows how biooxidation can be used as a pretreatment step in a conventional gold mill. Processing refractory ore involves the addition of flotation, coated biooxidation and neutralization unit operations. The coated biooxidation process is shown in greater detail in Figure 3. Here a sulfide gold concentrate is coated onto support rocks.

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  • Gold extraction - Wikipedia

    These refractory ores require pre-treatment in order for cyanidation to be effective in recovery of the gold. A refractory ore generally contains sulfide minerals, organic carbon, or both. Sulfide minerals are impermeable minerals that occlude gold particles, making it difficult for the leach solution to form a complex with the gold.

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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 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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  • Fungal pretreatment of sulfides in refractory gold ores ...

    May 01, 2011· 1. Introduction. In sulfidic refractory gold ores, tiny gold particles typically <1 μm (Marsden and House, 2006) may be highly disseminated and locked up within the grain boundaries or fractures of sulfide minerals such as pyrite and arsenopyrite.Thus, decomposition of the sulfides is required to liberate the gold (Baako, 1972, Boyle, 1979, Komnitsas and …

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  • Refractory Gold Ore Treatment Methods

    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 is associated with arsenic, antimony, …

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  • 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.

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  • Microbial Pretreatment of Refractory Gold Ore - Xinhai

    Part of refractory gold ores of gold particles with fine gold or submicroscopic gold a parcel or disseminated exist in sulfide ore and the sulfide is usually pyrite, arsenopyrite, pyrrhotite, even in some mineral deposits, most of the gold can enter the crystal lattice of pyrite, arsenopyrite, in the state of super micro gold.

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  • Leachox™ Refractory and Sulphide Gold Process | Maelgwyn ...

    Refractory gold ores are generally defined as those ores that do not give economical recoveries in conventional cyanide circuits where the ore has been ground to around 53 to 75 microns. The gold is normally present in refractory gold sulphide ores containing mainly pyrite, arsenopyrite or pyrrhotite and occurs in both the chemically bonded ...

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  • 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.

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  • Method of gold extraction from sulphide gold-bearing ores

    The invention relates to hydrometallurgy of precious metals and can be used for the extraction of gold from refractory ores and concentrates. For multi-stage technology of gold extraction plant for intrusion resistant gold-bearing ores has developed a number of pyro-and hydrometallurgical methods, while bacterial leaching shows good economic performance and environmental safety (metallurgy ...

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  • (PDF) Bacterial leaching as a pre-treatment step for gold ...

    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 …

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

    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 conventional cyanidation to leach gold. This pre-treatment consisted of bubbling air into an ore/water mixture for eight hours while adding enough caustic sodium hydroxide to maintain a pH of 11 throughout the test. Three ...

    Get Price
  • Pretreatment Process on Refractory Gold Ores with As

    1. Introduction. 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.

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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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  • 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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  • oxidizing double refractory ore in gold processing

    The efficiency of biooxidation for treatment of a double-refractory gold-bearing sulfide ore concentrate from the Bakyrchik deposit East Kazakhstan was defined The experiments were conducted in two different modes ie with the standard liquid medium and the medium imitating the chemical composition of the Bakyrchik deposit...

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  • Developments in the pretreatment of refractory gold ...

    submicroscopic gold inclusions within sulphide minerals such as arsenopyrite and pyrite. Such ores require a pre-treatment process to alter or destroy the sulphide matrix and render the gold accessible to cyanide and oxygen (Gudyanga et al., 1999). The gold in high-sulphur and high-arsenic refractory gold concentrate (HGC) is encapsulated

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  • US4923510A - Treatment of refractory carbonaceous sulfide ...

    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 improve the yields on any economic basis.

    Get Price