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alkaline pre oxidation gold cyanidation refractory

alkaline pre oxidation gold cyanidation refractory

The influence of pyrite pre-oxidation on gold recovery

2006-7-1  The results of alkaline pre-oxidation and gold leaching by cyanidation suggested that the alkaline pre-oxidation was an effective treatment for the refractory gold ore. Gold extraction after pre-oxidation under appropriate conditions increased from 20% of direct cyanide leaching to 70.0%.

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The influence of pyrite pre-oxidation on gold recovery

The influence of pyrite pre-oxidation in alkaline solutions on gold recovery by cyanidation from Twin Creek refractory gold ore in which pyrite was identified as the major sulfide mineral has been investigated with the aid of electrochemical measurements, leaching experiments, and direct analysis of reaction products for selected residues.

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Alkaline Pre-oxidation for Refractory Gold

A new hydrometallurgical pre-oxidation process for the refractory gold arsenosulfide concentrates under normal temperature and pressure was presented. It comprised fine grinding, intensified agitation alkali-leaching, cyanidation and adsorption.

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Atmospheric alkaline pre-oxidation of refractory

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.

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Optimizing the alkaline oxidation pretreatment of a ...

2018-9-28  Ammonia and sodium chloride were used for alkaline oxidation pretreatment of refractory gold ore before cyanide leaching. Ca (OH) 2 was used as a pH modifier to maintain the pH at the targeted value during oxidation and leaching. Sodium cyanide was also applied as a leaching agent. 3.2.

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Atmospheric alkaline pre-oxidation of refractory

Atmospheric alkaline pre-oxidation of refractory sulphide gold ores Semantic Scholar. DOI: 10.14288/1.0366302. Corpus ID: 139611489.

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Alkaline Oxidative Leaching of Gold-Bearing Arsenopyrite

Alkaline pressure oxidation is not new; it was first proposed by Sill (13) in the late 1950's for treating arsenic sulfide ores and was used commercially for treating a cobalt-nickel arsenic ore (14). Alkaline pressure oxidation was also used to treat high-acid-consuming mercury gold ore (15). Alkaline pressure oxidation yields a residue composed primarily of iron oxide, which is environmentally safe and

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Alkaline Oand Idation Refractory Gold - domy-rolmex.pl

The oxidation of refractory arsenical gold concentrates in aerated alkaline solutions results in the formation of thiosulfate, arsenate and sulfate as well as theget price Atmospheric alkaline pre-oxidation of refractory sulphide

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Gold recovery from refractory gold concentrates by ...

2019-3-1  There are two reasons for refractory of gold: (a) The content of organic carbon in the ores is higher and carbon could be enriched in the flotation process. The higher content of carbon in the flotation concentrate would cause “pre-robbing” in the cyanidation stage, and

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Refractory Gold Ore Treatment Methods - 911

2016-7-14  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 70.6 per cent, only 62.7 per cent of the contained gold

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Alkaline Pre-oxidation for Refractory Gold

A new hydrometallurgical pre-oxidation process for the refractory gold arsenosulfide concentrates under normal temperature and pressure was presented. It comprised fine grinding, intensified agitation alkali-leaching, cyanidation and adsorption. In a stirring-type pulverizing-leaching tower mill, the concentrate was ground to 37μm of 98 %, then the intensified alkaline leaching for 24 h by ...

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Atmospheric alkaline pre-oxidation of refractory

DOI: 10.14288/1.0366302 Corpus ID: 139611489. Atmospheric alkaline pre-oxidation of refractory sulphide gold ores @inproceedings{Rego2018AtmosphericAP, title={Atmospheric alkaline pre-oxidation of refractory sulphide gold ores}, author={Alan Joseph Rego}, year={2018} }

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The influence of pyrite pre-oxidation on gold recovery

The influence of pyrite pre-oxidation in alkaline solutions on gold recovery by cyanidation from Twin Creek refractory gold ore in which pyrite was identified as the major sulfide mineral has been investigated with the aid of electrochemical measurements, leaching experiments, and direct analysis of reaction products for selected residues.

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Optimizing the alkaline oxidation pretreatment of a ...

2020-5-14  Optimizing the alkaline oxidation pretreatment of a refractory gold ore using taguchi orthogonal array method To cite this article: Foad Mahmoodi and Asghar Azizi 2018 Mater. Res. Express 5 126516 View the article online for updates and enhancements. Recent citations Synergistic effect of reduction leaching of manganese anode slime and oxidation

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Gold Sulphide Ore Oxidation by Alkaline Pressure

2017-10-20  Refractory ores, such as ores with gold disseminated in pyrite or arsenopyrite, are not amenable to direct cyanidation. Historically, refractory ores were roasted to oxidize the sulfides. New hydrometallurgical technology developed in the past decade such as aqueous pressure oxidation (Berezowsky, 1984) and bacterial oxidation

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OXIDATION OF REFRACTORY GOLD CONCENTRATES

2013-7-9  OXIDATION OF REFRACTORY GOLD CONCENTRATES AND SIMULTANEOUS DISSOLUTION OF GOLD IN AERATED ALKALINE SOLUTIONS By Suchun Zhang B. Eng. (Appl. Chem.), Tsinghua University, Beijing, China This thesis is presented for the degree of Doctor of Philosophy of Murdoch University Western Australia March 2004

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Effect of Pretreatment of Sulfide Refractory Concentrate ...

2013-12-24  Pressure oxidation typically operates at moderate temperature and pressure, temperatures of 60˚C to 80˚C and an oxygen pressure of 60 to 80 psi. Under these con- ditions, the sulfide sulfur is oxidized to sulfate. 1.2. Alkaline Oxidation . Arsenopyrite has an economic importance, when there is more of it than gold in the ore. Oxidation of ...

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Review Pretreatment Process on Refractory Gold Ores

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. Therefore, pre-treatment of arsenic-bearing refractory gold has an extreme-ly important significance.

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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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Alkaline Oxidative Leaching of Gold-Bearing Arsenopyrite

cyanidation for the gold recovery. Ores containing high carbonates will result in high acid consumption. Finally, silver recovery from the procedure is usually poor because during oxidation silver has the propensity to combine with insoluble jarosites. Alkaline pressure oxidation is not new; it was first

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Gold recovery from refractory gold concentrates by ...

2019-3-1  Gold recovery from refractory gold concentrates by pressure oxidation pre-treatment and thiosulfate leaching ... Li et al. researched pyrite pre-oxidation in alkaline environment, they observed that that an iron-, silicon-, and calcium-bearing compound, with variable amounts of sulfur, commonly surrounded pyrite ... restrictions on cyanidation ...

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Pre-Oxidation of a Refractory Sulphide Gold Ore in ...

2021-5-5  Pre-Oxidation of a Refractory Sulphide Gold Ore in Alkaline Media. The Eldorado Gold Corp. has developed a method of treating a hard-to-process ore from a mine in China in order to increase their recovery of gold. While this process has proven to be effective, more research is needed on the exact method in which this technique works on a very ...

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Alkaline Oand Idation Refractory Gold - domy-rolmex.pl

alkaline oand idation refractory gold. alkaline oand idation refractory gold Grinding Mill . alkaline oand idation refractory gold [ 48 6486 Ratings ] The Gulin product line, consisting of more than 30 machines, sets the standard for our industry We plan to help you meet your needs with our equipment, with our distribution and product support system, and the continual introduction and updating ...

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EDTA-enhanced cyanidation of refractory bio-oxidised ...

2020-5-1  1. Introduction. Biological oxidation (BIOX®) of ores and concentrates containing auriferous sulphide minerals (FeS 2, FeAsS), using chemolithotrophic bacteria, liberates occluded gold (Au), by direct and/or indirect reactions, and enhances gold cyanidation efficacy of otherwise complex, refractory ores (Marsden and House, 2006; Miller and Brown, 2016).

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Extraction of Gold from a Low-Grade Double

The concentrate from the flotation procedure was processed using different preoxidation methods. A concentrate containing 34.08g/t of gold with the gold recovery ratio of 81.20% was obtained by flotation. After roasting, microwave heating or alkaline pressure oxidation, the gold cyanidation ratio reached 82.37%, 81.26% and 71.09% respectively.

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Optimizing the alkaline oxidation pretreatment of a ...

2018-9-28  This study investigates the alkaline oxidation pretreatment process of Zarshuran refractory gold ore. Taguchi method-orthogonal array design (OAD) is applied to evaluate and optimize the influence of five main factors including solution pH, aeration rate, agitation speed, temperature, and oxidation

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Bacterial oxidation of refractory gold concentrates ...

2005-1-1  Bacterial oxidation is now considered to be a proven commercial technique for the treatment of refractory sulfide gold concentrates. Since 1986 the technique has been applied successfully on a commercial scale for the removal of arsenopyrite and pyrite to give high gold extractions on cyanidation (Van Aswegen et al., 1989).A chronology of gold projects, recognized as using agitated aerated ...

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The Albion Process for Refractory Gold - Core Resources

2019-5-1  Some of the main oxidation reactions that occur in an Albion Process leach of a refractory gold concentrate are presented below. For simplicity, it has been assumed that the main carriers of the precious metals are pyrite, arsenopyrite and telluride species, however testwork has been carried out on concentrate samples containing a broad range of

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Refractory Gold Ore Treatment Methods - 911

2016-7-14  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

Get Price

Pre-Oxidation of a Refractory Sulphide Gold Ore in ...

2021-5-5  Pre-Oxidation of a Refractory Sulphide Gold Ore in Alkaline Media. The Eldorado Gold Corp. has developed a method of treating a hard-to-process ore from a mine in China in order to increase their recovery of gold. While this process has proven to be effective, more research is needed on the exact method in which this technique works on a very ...

Get Price

Effect of Pretreatment of Sulfide Refractory Concentrate ...

2013-12-24  Pressure oxidation typically operates at moderate temperature and pressure, temperatures of 60˚C to 80˚C and an oxygen pressure of 60 to 80 psi. Under these con- ditions, the sulfide sulfur is oxidized to sulfate. 1.2. Alkaline Oxidation . Arsenopyrite has an economic importance, when there is more of it than gold in the ore. Oxidation of ...

Get Price

The Albion Process for Refractory Gold - Core Resources

2019-5-1  Some of the main oxidation reactions that occur in an Albion Process leach of a refractory gold concentrate are presented below. For simplicity, it has been assumed that the main carriers of the precious metals are pyrite, arsenopyrite and telluride species, however testwork has been carried out on concentrate samples containing a broad range of

Get Price

Recovery Refractory Resources - SGS

refractory resources Refractory gold ore needs pre-treatment for cyanidation to be effective in gold recovery. Ailbhe Goodbody looks at the advantages and disadvantages of the most common pre-treatment options, and speaks to some companies that offer or use the processes A refractory gold ore is gold-containing ore that is resistant to

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Alkaline Pressure Oxidation of Pyrite in the Presence of ...

2013-11-22  Alkaline Pressure Oxidation of Pyrite in the Presence of Silica – Characterization of the Passivation Film ... Alkaline pressure oxidation, particularly in the presence of trona as additive, can be used to oxidize high carbonate refractory gold ores as it prevents the formation of CO 2 in the autoclave. ... pH ~ 9-10 prior to cyanidation by ...

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OXIDATION OF REFRACTORY GOLD CONCENTRATES

2010-12-21  OXIDATION OF REFRACTORY GOLD CONCENTRATES AND SIMULTANEOUS DISSOLUTION OF GOLD IN AERATED ALKALINE SOLUTIONS By Suchun Zhang B. Eng. (Appl. Chem.), Tsinghua University, Beijing, China This thesis is presented for the degree of Doctor of Philosophy of Murdoch University Western Australia March 2004

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How to Improve the Refractory Gold Leaching

2020-8-18  The alkaline hot-pressure oxidation is only suitable for refractory gold deposits with high carbonate content and low sulfide content (20%). The acidic hot-pressure oxidation means that the pyrite, arsenopyrite and other sulfides react with the oxygen in an acidic medium under the high temperature and high pressure.

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Gold Process Mineralogy - sgs.au

extraction of refractory gold can only be achieved by employing a pre-oxidation process prior to cyanide leaching. Antimony, bismuth sulfide, and telluride gold ores are often somewhat refractory due to the presence of slow-dissolving gold minerals such as aurostibite (AuSb 2), maldonite (Au 2 Bi), and gold tellurides. Carbonaceous sulfide ores

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Gold recovery: Effect of ozonation on refractory gold ores ...

2018-10-1  refractory gold ores. The use of ozone as an alternative oxidant for refractory gold ores prior to cyanidation was evaluated as a solution to the challenges in gold mine industry. The evaluations were based on gold recoveries, percentage sulphides oxidised, and reagent consumption. The oxidation of refractory ores with ozone

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Potential pre-treatment and processing routes for

2021-3-11  2.7 Bacterial Pre-oxidation . The method is employed to pre -treat refractory gold ores by oxidation. After oxidation, the arsenic is then removed from solution. The process is showed in Figure 2. Proceedings of the 2nd African International Conference on Industrial Engineering and Operations Management Harare, Zimbabwe, December 7-10, 2020

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