• Effect of Pretreatment of Sulfide Refractory Concentrate ...

    2013-12-24 · For extraction of gold from refractory ores or concen- trate, in which gold is surrounded or covered by iron sul- fide minerals, mainly arsenopyrite and pyrite, mineral oxidative pretreatment is essential to oxidize sulfides and to expose gold to the leaching solution. Pyrometallurgi- cal oxidation by roasting is under environmental restric-

  • Pretreatment Process on Refractory Gold Ores with As

    2015-3-1 · An arsenopyrite refractory ore was pretreated with NaOH to increase gold extraction. After pretreatment, gold and silver were leached with copper ammonium thiosulfate solution. Thiosulfate leaching of the as-received ore extracted only 21% and 29% of silver and gold, respectively. Up to 81% of the gold and 50% of the silver were recovered after ...

  • acidic pretreatment of gold refractory ore processing

    Recovery of gold from refractory auriferous iron, - Know More. Feb 18, 1986 0183 32, from refractory auriferous iron-containing sulphidic ore which comprises feeding ground ore as an aqueous slurry to an acidic pretreatment step,...

  • (PDF) Cyanidation of Refractory Gold Ores: A Review

    2021-12-11 · In this paper, the effect of the oxidative pretreatment and lead nitrate addition on the cyanidation of Zarshuran refractory gold ore containing 3.32 ppm Au, 1.09% As, and 0.5% sulfur were ...

  • 2020-9-1 · Wang Hao,Tian Qinghua,Xin Yuntao,et al.Research on the process of pretreatment of refractory gold ores containing antimony by ozonation leaching[J].Gold Science and Technology,2016,24(4):154-159. 18

  • Pretreatments Applied to Refractory Gold Ores | Request …

    It is necessary to apply a pretreatment process to obtain high gold recoveries (> 80 percent) from refractory ores by cyanide leaching. Many studies have been conducted on the oxidation of ...

  • Pretreatment Of Copper Ore Prior To Heap

    2021-6-30 · Heap Leaching Of Gold. Abstract. biooxidation pretreatment of refractory precious metal ores and concentrates is now a recognized, full-scale production process which may serve as an alternative to roasting and pressure oxidation. the gencor (biox ) biooxidation process 1–3 for pretreatment of refractory gold-ore concentrates has been commercially applied at five.

  • Process mineralogy characteristics of acid leaching ...

    2018-10-2 · To provide a theoretical basis for a suitable process to extract gold from refractory gold concentrates, process mineralogy on the acid leaching residue of gold calcine was studied by chemical composition, X-ray diffraction, scanning electron microscopy-energy spectrum, and mineral dissociation analysis. The results showed that the acid leaching residue contained Au …

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

    2020-5-28 · 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 …

  • Refractory Gold Ore Treatment Methods

    2016-7-14 · Metallurgical ContentGold Leaching & Processing of Arsenic OreMispickel (Arsenopyrite: FeAsS).6Leaching and Recovering Gold from …

  • An evaluation of pretreatments to increase gold recovery ...

    2000-1-1 · In batch leaching the rate of leaching is described by Eq. 5 (Nicol, 1988); 8 4Aul -- = kl{[Au]-[Au]e}2 dt M. N. Lehmann et al. (5) Equation 5 can be integrated to give Eq. 6, which describes the concentration of undissolved gold as a function of time; 1 =kl.t + 1 [Au] - [Au1 e [Au1 o - [Au1 e (6) where [Au] is the concentration of gold in the ...

  • Mineralogical characteristics and treatment of refractory ...

    Abstract. Refractory gold ores and concentrates are characterised by low gold recoveries and high cyanide consumptions when subjected to direct cyanide leaching. Therefore an oxidation pretreatment step is required before cyanidation that will break up the sulphide lattice and render gold particles accessible to cyanide ions.

  • Pretreatment Of Refractory Gold Ore With Microwaves

    pretreatment of refractory ores prior to gold leaching. Gold extraction Wikipedia the free encyclopedia A quot refractory quot gold ore is an ore that is naturally resistant to recovery by standard cyanidation and carbon adsorption processes These refractory ores … Chat Now. microwave pretreatment of a refractory gold.

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

    In sulphidic refractory gold ores, tiny gold particles may be highly disseminated and locked up or occluded within the grain boundaries or fractures of sulphides, typically pyrite and arsenopyrite.

  • MODELING OF HIGH PRESSURE PRETREATMENT …

    2018-10-22 · 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".

  • EnviroMetal achieves high gold yields in refractory gold ...

    2021-12-16 · All testing was conducted by EnviroMetal at its laboratory in Burnaby, British Columbia. The pretreatment included what is known as Albion Process™ technology. This is a combination of ultra-fine crushing and oxidative leaching at atmospheric pressure for processing refractory gold and copper ores and zinc concentrates.

  • COMPARISON OF CYANIDE AND THIOSULPHATE …

    2016-3-20 · Before leaching the gold, ore must be crushed and grinded into small particles, usually particle size varies between 30 and 180 μm. Free milling ores are ready for leaching after crushing and grinding whereas refractory ores need pretreatment. It is important to pretreat a refractory ore before leaching to achieve better gold extraction.

  • Microbial Pretreatment of Refractory Gold Ore

    2016-3-28 · Microbial Pretreatment of Refractory Gold Ore. 2016-03-28 17:59:31 XinHai (2007) 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 ...

  • Improvement of Gold Leaching from a Refractory Gold ...

    2017-7-31 · energy consumption. As a result, proper pretreatments are necessary to improve the leaching of gold from these refractory gold ores [5,6]. The pretreatment of oxidative roasting has always been one of the most extensively used methods in China attributing to its mature technique, high efficiency, energy conservation, etc. [7,8] Effective ...

  • Effect of Oxidative Pretreatment and Lead Nitrate Addition ...

    2019-11-1 · Cyanidation is the main process in gold leaching. There are several parameters that affect gold recovery and cyanide consumption. In this paper, the effect of the oxidative pretreatment and lead nitrate addition on the cyanidation of Zarshuran refractory gold ore containing 3.32 ppm Au, 1.09% As, and 0.5% sulfur were investigated. Au recovery was …

  • 2018-4-10 · Moreover, leaching of refractory gold ores by traditional cyanidation techniques also results in poor gold recovery. On this basis, non-cyanide lixiviants have attracted considerable attention in the metallurgical industry, and several non-cyanide leaching methods have been proposed for gold extraction because of their non-toxic nature, acceptable gold leaching rates, …

  • 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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    Some conventional pretreatment methods such as the pre-aeration method by chlorination, roasting, pressure oxidation, ultrafine grinding, and flotation-intensive leaching . are . proven to be less suitable to process refractory-type gold ores because such methods have several disadvantages such as expensive

  • Biooxidation‒thiosulfate leaching of refractory gold ...

    2019-7-21 · A process of biooxidation followed by thiosulfate leaching of gold from refractory gold concentrate was investigated. Mineralogical studies on the concentrate showed that very fine gold grains (<10 μm) were encapsulated in pyrite and arsenopyrite, while the proportion of monomer gold was only 21%. The gold-bearing sample was identified as a high-sulfur fine-sized …

  • Review Pretreatment Process on Refractory Gold Ores …

    3.1. Alkaline Leaching Pretreatment Alkaline leaching pretreatment is a chemical pretreatment process which can oxidize and dispose of components of the ore through adding chemical reagents. Meng Yuqun, Wu Minjie, etc. have researched to strengthen Fig. 1. General process options for pretreating refractory gold ores. Fig. 2.

  • Potential pre-treatment and processing routes for …

    2021-3-11 · conventional leaching process. The gold ores that contain As must be crushed in order to expose the gold for leaching with an appropriate gold leaching agent (Yanget al, (2008); Zhou et al, 2009) In order to maintain the sustainable use of gold resources, effective pre- treatment and processing of complex gold ores is urgently required.

  • Pretreatment Of Copper Ore Prior To Heap

    Treatment Of Copperrich Gold Ore By Cyanide Leaching. ammoniacal cyanide 11,12, leaching of copper prior to cyanidation 2,6,8, cyanide recovery from effluents e.g. SART process 5, preaeration prior to cyanidation 6,13,14, and addition of lead nitrate 14,15 have been tested for the treatment of copper-rich gold ores.

  • Gold Leaching from Refractory Ores—Literature Survey ...

    2007-4-27 · However, pretreatment processes involving thermal oxidation, such as roasting, chemical oxidation, such as acid leaching, acid or alkaline pressure leaching; or biological oxidation such as bioleaching with T. Ferrooxidans liberates gold from refractory minerals. Gold is then recovered from the oxidized mass by alkaline cyanidation.

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