pretreatment of refractory ores in gold leaching process congo

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.

Pretreatment of a refractory arsenopyritic gold ore using ...

2015-3-1 · An arsenopyrite refractory ore was pretreated with NaOH to increase gold extraction.

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.

Developments in the pretreatment of refractory gold ...

2009-11-20 · mineralogy of ores being encountered in which gold is locked up in various sulphidic host minerals. Gold ores are classified as highly refractory when at least 80% of the gold cannot be extracted by conventional cyanidation leaching even after fine grinding. A very common cause of refractoriness is the dissemination of fine grained or

Pretreatment Process on Refractory Gold Ores with As

The problem of the refractory nature of gold bearing arsenide ores is described. The basic principle, characteristics and application of pretreatment technique of arsenic-bearing gold ores are...

Oxidative pre-treatment in thiosulphate leaching of ...

2010-2-19 · In addition, Barrick Gold Corporation patented a combined pressure oxidation, thiosulphate and resin-in-pulp process for treatment of refractory gold ores (Thomas et al., 1998). These pre-treatment processes are either slow (e.g. bio-oxidation) or expensive (e.g. fine milling, roasting, pressure oxidation).

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 ...

Refractory Gold Ore Treatment Methods

2016-7-14 · 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

Processing of refractory gold ores - ScienceDirect

1991-1-1 · Processing of refractory gold ores 1037 The oxidation tanks themselves are often configured in four stages with additional tanks employed in the first stage to accommodate the increased oxidation rates and aeration requirements in the initial phases of the reaction. Residence times in the tanks are often of the order of 3 to 4 days.

Treatment of Refractory Gold Ores | SpringerLink

Rose and Newman’s very comprehensive book, The Metallurgy of Gold, does not even contain the term refractory in its latest, fourth edition (1937). 1 Dorr and Bosqui’s Cyanidation and Concentration of Gold and Silver (2d edition, 1950) has a brief chapter (XIII) on “Cyanicides and Refractory Ores,” with only four pages devoted to ...

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

Refractory gold-bearing ores: a review of treatment methods and recent advances in biotechnological techniques By Francisco Carranza Biohydrometallurgy and Biomineral Processing Technology:A Review on its Past, Present and Future

Aeration pretreatment of low grade refractory gold ores ...

1990-2-1 · 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 subeconomic material, including mine ...

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.

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 ...

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".

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

2021-4-5 · 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 ...

Treatment of Refractory Gold Ores | SpringerLink

Rose and Newman’s very comprehensive book, The Metallurgy of Gold, does not even contain the term refractory in its latest, fourth edition (1937). 1 Dorr and Bosqui’s Cyanidation and Concentration of Gold and Silver (2d edition, 1950) has a brief chapter (XIII) on “Cyanicides and Refractory Ores,” with only four pages devoted to ...

PRETREATMENT PROCESSES IN GOLD RECOVERY BY

2018-10-22 · PRETREATMENT PROCESSES IN GOLD RECOVERY BY THIOSULPHATE LEACHING Examiners: Professor Ilkka Turunen D.Sc. (Tech.) Arto Laari Supervisor: M.Sc. (Tech.) Matti Lampinen . ALKUSANAT Tämä diplomityö tehtiin Lappeenrannan teknillisellä yliopistolla, LUT kemialla.

(PDF) Refractory gold-bearing ores: a review of treatment ...

Oxidative pretreatment of refractory gold ores/concentrates (and passivation of carbonaceous material) using nitric acid based processes (i.e., Nitrox and Arseno (Redox)) were also tested in the ...

(PDF) Application of Diagnostic Leaching Technique for ...

Application of Diagnostic Leaching Technique for Refractory Gold Ores. Ibrahim Alp. Related Papers. Evaluation of Refractory Behaviour of Kaletaş (Turkey) Gold Ore. ... Improved gold and silver extraction from a refractory antimony ore by pretreatment with alkaline sulphide leach.

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

Refractory gold-bearing ores: a review of treatment methods and recent advances in biotechnological techniques By Francisco Carranza Biohydrometallurgy and Biomineral Processing Technology:A Review on its Past, Present and Future

Microbial Pretreatment of Refractory Gold Ore - Xinhai

2016-3-28 · 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 gold ores due to coarse size or thin and gangue minerals symbiosis relations complex factors through the above process unable to ...

Options to Treat Refractory Ores - Albion Process

2017-12-20 · leaching circuits, even when the ore is finely ground. The cause of low gold recoveries can be either through the presence of naturally occurring ‘preg robbing’ carbonaceous materials or gold physically ‘locked’ in sulphide minerals. The majority of gold ores are classified refractory because the gold mineralogy is contained in sulphides.

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.

MICROBIAL PRE-TREATMENT OF DOUBLE REFRACTORY

2020-3-24 · of double refractory gold ores and concentrates. Currently numerous studies are in progress to further improve upon the efficiency of the bacterial process and to investigate

(PDF) Application of Diagnostic Leaching Technique for ...

Application of Diagnostic Leaching Technique for Refractory Gold Ores. Ibrahim Alp. Related Papers. Evaluation of Refractory Behaviour of Kaletaş (Turkey) Gold Ore. ... Improved gold and silver extraction from a refractory antimony ore by pretreatment with alkaline sulphide leach.

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.

Gold recovery: Effect of ozonation on refractory gold

2018-10-1 · et al., have previously used ozone as a means of improving gold recoveries from refractory gold ores subsequent to hypochlorite leaching. Other studies on pre-treating has been done by Rodríguez-Rodríguez, et al. (2018) and the results have shown that ozonation can be a suitable alternative to treat refractory gold ores.

Improvement of Gold Leaching from a Refractory Gold ...

A total gold extraction of 70.2% could only be reached via direct cyanidation from a refractory As-, S- and C-bearing gold concentrate calcine, and the gold extraction varied noticeably with different size fractions. The reasons for unsatisfactory gold extraction from the calcine were studied through analyses of chemical composition, chemical phase and SEM-EDS of different sizes of particles.

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