Refractory Ore Gold And Pretreatment 2012

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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pretreatment of refractory gold ore

pretreatment of refractory gold ore. Gold ore which is difficult to concentrate often referred to gold or refractory gold ore which use conventional cyanide process cannot effectively extract most of the gold ore Therefore it is commonly said that the treatment of gold is the case of the cyanide method pretreatment of refractory ores in gold leaching Abstract: Gold telluride ores are important ...

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Improvement of Gold Leaching from a Refractory Gold ...

Refractory gold ores have increasingly been the main source of gold production with the exhaustion of amenable gold ores. Of the 2630 tons of total world gold production in 2011, about 25% was produced from refractory gold deposits, and of the top 20 gold operations in 2011, eight were processing refractory ores [].Commonly, relatively high content of detrimental impurities like S (sulfur), As ...

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Mineralogy and Pretreatment of a Refractory Gold Deposit ...

The gravity–flotation combined beneficiation pretreatment process provided a feasible method for the refractory gold ore and ensured the effective recovery of gold. The technological mineralogy of a gold deposit located in North-Western province of Zambia was carried out by using X-ray fluorescence spectroscopy (XRF), X-ray diffraction ...

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refractory ore gold and pretreatment

Feb 1 2012 Turkey. 1. Introduction. The poor extraction of refractory gold ores is an old and still . Get Price; Cyanidation of Refractory Gold Ores A Review. Cyanidation of Refractory Gold Ores A Review R.K. Asamoah concerns and approach towards refractory gold ore cyanidation considering the conceptual and. Get Price

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Alkaline sulfide pretreatment of an antimonial refractory ...

Nov 16, 2010· This paper presents the alkaline sulfide pretreatment of an antimonial refractory gold and silver ore. In the ore, gold occurs mainly as gold-silver alloys and as associated with quartz and framboidal pyrite grains, and, to a small extent, as the inclusions within antimonial sulfides. Silver is present extensively as antimonial sulfides such as andorite. Alkaline sulfide pretreatment was shown ...

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Microwave pretreatment of a double refractory gold ore ...

Abstract Double refractory gold ores, such as Barrick's Goldstrike ore, contain both pyrite and carbonaceous matter and the latter results in the loss of gold from solution during cyanide leaching. One possible remedy is to roast the ore and thus oxidize the pyrite and remove the organic carbon. In this research, microwave roasting of a double refractory gold ore was investigated as an ...

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refractory ore gold and pretreatment

Refractory Ore Gold And Pretreatment 2012. Gold mineral processing Hatch Ltd Refractory gold ore pretreatment Treatment of refractory gold ore whole ore and flotation concentrates has become more prominent since the 1980s with many gold discoveries often including ores that are wholly or partially refractory .

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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 …

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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 ...

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Implementation of sodium hydroxide pretreatment for ...

Furthermore, recent studies demonstrated that sodium/potassium hydroxide pre-treatment is a viable technique for the processing of refractory antimonial gold/silver ores containing minerals such ...

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Review Pretreatment Process on Refractory Gold Ores with As

refractory gold ores with As. Pretreatment options for deal-ing with refractory gold ores are illustrated in Fig. 1 and described in detail in the subsequent sections. 2. Roasting Oxidation Pretreatment So far, the application of roasting oxidation pretreatment has a history of 70 years. The principle is to destroy the ores

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The Oxidation Pretreatment of a Sulfidic Refractory Gold ...

An attempt has been made to study the pretreatment of sulfidic refractory gold ore with pyrolusite. The influences of various parameters were studied to optimize the conditions. The optimum leaching conditions were pyrolusite/gold ore mass ratio of 3.0, H2SO4 concentration of 3.0 M, temperature of 100°C, particle size of 45μm, stirring speed of 200 rpm.

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GOLD RECOVERY OF REFRACTORY SULFIDE CONCENTRATES …

recovery from the refractory sulfide gold ores. An oxidative pretreatment of the ore is essential to oxidize the sulfides and expose gold. The conventional methods of extraction of refractory sulfide gold ores usually follow roasting-leaching and electrowinning steps. Roasting is one oxidative pretreatment

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Pretreatment Process on Refractory Gold Ores with As

Therefore, pretreatment of arsenic-bearing refractory gold has an extremely important significance. 3) In recent years, researches are mainly about the refractory gold leaching easily through arsenic removal to expose gold, changing the composition, physic-chemical and electro-chemical properties of the ore.

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Improvement of Gold Leaching from a Refractory Gold ...

Refractory gold ores have increasingly been the main source of gold production with the exhaustion of amenable gold ores. Of the 2630 tons of total world gold production in 2011, about 25% was produced from refractory gold deposits, and of the top 20 gold operations in 2011, eight were processing refractory ores [1].

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Pretreatment Of Refractory Ores Prior To Gold Leaching

Refractory Ore Gold And Pretreatment 2012. Pretreatment Of Refractory Ores Prior To Gold Leaching. Leaching of a Refractory Gold Ore Sample from the The. A cyanidation study was conducted on a mild refractory gold ore sample from the The effects of grinding, pretreatment, lead nitrate, kerosene and cyanide prior to leaching increased the gold ...

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CN102560138A - Pretreatment method of refractory gold ore ...

The invention discloses a pretreatment method of refractory gold ore, which is characterized by comprising the following steps of: adopting a dry-wet two-level ball grinder activating and impregnation process; carrying out first-level dry grinding by adopting a vibratory ball grinder and efficiently improving the mineral activity on the basis of energy conservation through adjusting the ...

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GOLD RECOVERY OF REFRACTORY SULFIDE CONCENTRATES …

The problem of refractory sulfide gold ore that has a gold recovery less than 50% when direct cyanidation applied, still exists until now. It needs oxidative pretreatment for cyanidation to be effective in gold recovery the objective of this study is figuring out the effect of sodium nitrite as an oxidizing reagent on cyanidation of refractory gold ore.

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ALTA Gold 2012 E-Doc - Albion Process

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.

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PAPER OPEN ACCESS Biooxidation pretreatment of low grade ...

Hence, this refractory gold ore in its processing requires pretreatment methods before cyanidation. 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 ...

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Gold recovery from refractory gold concentrates by ...

Due to the depletion of high-grade gold ores with large-scale gold ore mining, the attention of gold production enterprises is switching towards refractory gold ores gradually (Karamanev et al., 2001; Zhu et al., 2012). There are two reasons for refractory of gold: (a) The content of organic carbon in the ores …

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Sulphidic refractory gold ore pre-treatment by selective ...

Mar 01, 2013· Often, the gold bearing ores are refractory due to the gold grains and concentration by flotation is necessary, either followed by roasting, bacterial leaching, or pressure leaching in a way that the gold is liberated prior to cyanidation . Two basic initial approaches are available: either treating the whole ore or processing some form of ...

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An acidic pressure oxidation pre-treatment of refractory ...

Roasting is the only commercialised process in Zimbabwe for the pre-treatment of refractory gold feedstocks for the subsequent cyanidation leaching. This process results in only about 75% gold recovery and is characterised by high gold values in the residue. A pressure oxidation process in an autoclave has been evaluated as an alternative. The process resulted in substantially higher gold ...

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Improved gold and silver extraction from a refractory ...

Improved gold and silver extraction from a refractory antimony ore by pretreatment with alkaline sulphide leach

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Aeration pretreatment of low grade refractory gold ores ...

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 ...

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gold refractory,ore classification,preprocessing methods

Classification of refractory ores. 1. Carbonaceous gold ore. There is organic carbon which can do ' Rob gold ' in gold and silver ore, and it causes that gold is adsorbed in the cyanide solution, make ore difficult to cyanide and leach. Generally, we use roasting and chlorination pretreatment …

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Ozone: Science & Engineering Pretreatment with Ozone for ...

Pretreatment with Ozone for Gold and Silver Recovery from Refractory Ores F. Nava-Alonso, E. Elorza-Rodrı´guez, A. Uribe-Salas, and R. Pe´rez-Garibay CNVESTAV Saltillo, Carretera Saltillo-Monterrey km 13, Ramos Arizpe, Coahuila, Me´xico In this work ozonization was studied as pretreatment for two Mexican refractory ores in order to increase ...

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Recovery Refractory Resources - SGS

September 2012 www. .com 148 PRECIOUS METALS PROCESSING Recovering 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

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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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