Pretreatment of a refractory arsenopyritic gold ore using ...

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. •

Processing technologies for gold-telluride ores

The results show that flotation procedures are much easier for gold tellurides compared to other refractory gold-bearing ores. For the conventional cyanide leaching process, pretreatment such as oxidation is required to achieve high gold recovery.

Nitric Acid Leaching for Pre-Treatment of a Copper Bearing ...

This study was undertaken to evaluate the nitric acid leaching as a potential pre-treatment process prior to cyanidation of refractory gold/silver ores. The nitric acid pre-treatment experiments ...

ECONOMICS OF REFRACTORY GOLD ORE PROCESSES

Refractory gold ores present a number of problems to the gold producer. Much has been written about the suitability of particular pretreatment processes for specific gold ores. We at Hazen Research have had the opportunity to participate in the development and application of a number of gold ore processes and to review others'

Pretreatment of a refractory arsenopyritic gold ore using ...

Pretreatment of a refractory arsenopyritic gold ore using hydroxyl ion. ... The temperature did not have significant effect in the pretreatment process. ... A. AzadehThe effect of solution parameters on the thiosulfate leaching of Zarshouran refractory gold ore. Int. J. Miner. Process., 131 (2014), pp. 43-50. Google Scholar.

Processing Refractory Gold - Hydrometallurgy: Leaching in ...

Refractory ores are normally have either a high sulfide content that masks the gold preventing cyanide leaching of the gold, or high organic content that also block gold leaching (reabsorbs the gold), or it can have a high clay content that also soaks up the cyanide.

PRETREATMENT OF GOLD ORE CONTAINED S AND As

PRETREATMENT OF GOLD ORE CONTAINED S AND As Lixian Xu, Qing Tian, Zhiqing Wang ... is corrosion resisting refractory lining inside of the autoclave to proof corrosion. Temperature controller Air ... The set-up diagram of Au cyaniding-leaching is given in Fig.3. The process and conditions of oxidizing roasting is as followed. The predesiccated ...

Microbial Pretreatment of Refractory Gold Ore - Xinhai

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.

Process Parameters for Bio-oxidation of Sulphur in the Pre ...

the oxidation of refractory gold sulphide ores including roasting, pressure oxidation, chemical leaching and bacterial ... Process Parameters for Bio-oxidation of Sulphur in the Pre-treatment of Bioleaching Residues ... increasing the kinetics of this sulphur oxidation process thereby reducing the residence time, while keeping reagent

Treatment of Refractory Gold Ores - XPS | Expert Process ...

Treatment of Refractory Gold Ores Extractive Metallurgy Once the cause has been identified, there are a number of alternatives for treating the ore. Firstly, the gold can be made more amenable to cyanidation by ultra-fine milling, followed by a hot atmospheric leach –the Albion Process.

Supercritical Water Treatment of Refractory Gold Ores

With pretreatment, gold recovery was 90%; by contrast, gold recovery was below 10% without pretreatment. Recent work at the Bureau of Mines showed some unique and potentially useful results when refractory gold ores were pretreated with supercritical water before standard leaching. This work is described below.

Pretreatment Of Refractory Ores In Gold Leaching Process Congo

BACTERIAL LEACHING AS A PRE-TREATMENT STEP FOR GOLD ... FOR GOLD RECOVERY FROM REFRACTORY ORES ... This leaching process decomposes the sulfide matrix, thus exposing the encapsulated precious metals to leaching solution.

Effect of Pretreatment of Sulfide Refractory Concentrate ...

Effect of Pretreatment of Sulfide Refractory Concentrate with Sodium Hypochlorite, Followed by Extraction of Gold ... classified as refractory ores, that require long leach without reaching satisfactory results. ... the extraction of precious metals several pretreatments are required. For extraction of gold from refractory ores or concen- trate ...

A Preliminary Study on Nitric Acid Pre-treatment of ...

This study was undertaken to evaluate the nitric acid leaching as a potential pre-treatment process prior to cyanidation of refractory gold/silver ores. The nitric acid pre-treatment experiments ...

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.

Recovery Refractory Resources - sgs.com

are driven by the gold recovery rate. The pre-treatment of refractory gold ore should increase the gold recovery rate in the cyanide leach process by 30-40% in order to be economical" "Large operations tend to choose roasting or pressure oxidation, while smaller operations tend to select bacterial leaching," says Dr Fleming. "Other

Gold extraction - Wikipedia

A "refractory" gold ore is an ore that has ultra fine gold particles disseminated throughout its gold occluded minerals. These ores are naturally resistant to recovery by standard cyanidation and carbon adsorption processes. These refractory ores require pre-treatment in order for cyanidation to be effective in recovery of the gold.

ALTA Gold 2012 E-Doc - albionprocess.com

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.

ECONOMICS OF REFRACTORY GOLD ORE PROCESSES

ECONOMICS OF REFRACTORY GOLD ORE PROCESSES John E. Litz and R. Wayne Carter 119th TMS Annual Meeting ... Hazen Research, Inc. 4601 Indiana Street Golden, Colorado 80403 Abstract Refractory gold ore pretreatment processes continue to receive much attention. This ... Pretreatment 6.868.332.85 8.97 Leach-ClP 0.02 0.02 Leach-CIP total 1.30 1.30 ...

MODELING OF HIGH PRESSURE PRETREATMENT PROCESS …

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".

Pretreatment Process on Refractory Gold Ores with As

Alkaline leaching pretreatment is a chemical pretreatment process which can oxidize and dispose of components of the ore through adding chemical reagents. ... In a word, pretreatment before leaching of refractory gold ores is one of technical problems in gold industry. The research of pretreatment has been constantly improved in recent years.

Pretreatment Of Refractory Ores Prior To Gold Leaching

pretreatment of refractory ores in gold leaching process congo. The pretreatment of refractory gold ores pretreatment of refractory ores prior to gold leaching Determining gold balance in refractory process to Hydrometallurgy of Gold Gold Industrial Processes Hydrometallurgy of gold 65 who developed a leaching process the traditional ...

pyrite leaching in gold congo - xclusivedirectory.co.za

pyrite leaching in gold congo pyrite leaching in gold congo Cyanidation of a pyrrhotite bearing gold ore. seriously reduces nor greatly enhances gold leaching (pyrite,chalcopyrite,arsenopyrite andThe role of metal cyanide species in leaching gold from a copper.

A two-stage bacterial pretreatment process for double ...

A two-stage bacterial pretreatment process for double refractory gold ores R.K. Amankwah a,*, W.-T. Yen a, J.A. Ramsay b ... as preg-robbers in the subsequent gold leaching process. Some studies on the microbial degradation of CM have been reported. Brierley and Kulpa (1992) and ... double refractory gold ores…

pretreatment of refractory ores in gold leaching process congo

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 …

Pretreatment Of Refractory Ores In Gold Leaching Process Congo

pretreatment of refractory ores in gold leaching process congo. If gold ore is in refractory form, pretreatment is necessary before leaching to make the process, economically profitable and also to make the leaching process possibly in general for recovery of gold.

equipment to leach gold ore using microwaves-DBM Crusher

pretreatment of refractory ores in gold leaching process congo 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 …

pretreatment of refractory ores prior to gold leaching

Pretreatment of Refractory Ores in Gold Leaching Process Congo XSM is a leading global manufacturer of crushing and milling equipment (Pretreatment of Refractory Ores . ... Pretreatment Process on Refractory Gold Ores with As, decomposition before gold leaching is called pretreatment of refractory gold Statistics show that, .

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