Cyanide Ammonia Leaching Of Copper Gold Ores

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leaching of copper from tailings using ammonia

Use of the ammonia cyanide leach system for gold copper Use of the ammonia cyanide leach system for gold copper ores with reference to the retreatment of the torco tailings Author links open overlay panel MC Costello IC Ritchie DJ Lunt Show more More Info leaching of copper from tailings using ammonia ammonium

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Industrial application of ammonia

The use of ammonia to reduce the consumption of cyanide during the leaching of gold from copper-bearing ores was patented in 1902 by Hunt (1902) during the first period of intense RD activity in gold metallurgy that followed the invention of the cyanide process by J S MacArthur and the Forrest brothers in the late 1880s

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A review of the selective leaching of gold from oxidised

The ammonia–cyanide leach system was first patented over 100 years ago and stands out as a unique method of selectively leaching up to 90% Au and 1% Cu from oxidised copper–gold ores using 10% NaCN used in conventional cyanidation processes

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copper gold ore processing plant

of Mineral Processing Mastra HCu (high copper) gold ores was investigated by laboratory tests at Ovacik cyanidation plant leaching time 24 hours for the Get Price Recent Process Developments at the Phu Kham Copper Gold to treat a high pyrite copper gold skarn ore with significant clay content as described by Meka and Lane (2010)

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(PDF) Industrial Application of Ammonia Assisted Cyanide

Industrial Application of Ammonia Assisted Cyanide Leaching for Copper-Gold Ores Farhang Hedjazi and A John Monhemius* Anglo Asian Mining plc Baku Azerbaijan ABSTRACT A description of the agitation leach plant used for treating gold-copper ores at Anglo Asian Mining's Gedabek mine in Azerbaijan is

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AMMONIUM THIOSULFATE LEACHING OF AN OXIDE GOLD

obtained with cyanide leaching indicating the possibility of use of thiosulfate Lowering copper grade prior to thiosulfate leaching through sulphuric acid leaching bad a negative effect on gold extraction while injecting N2 in order to reduce aeration increased

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Gold dissolution in non

ammoniacal copper(II)/thiosulphate system offers fast leaching kinetics but there are difficulties in controlling the complex solution chemistry and there are concerns over the use of ammonia Recently thiosulphate leaching of gold in the absence of ammonia has shown to be one of the most promising alternatives to cyanide as evident from the

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US3403020A

(Cl 75-106) ABSTRACT OF THE DISCLOSURE Copper is recovered from ores and ore fractions containing cuprous and cupric sulfides oxides carbonates and other copper bearing minerals by leaching with an alkaline solution containing 3 to 4 5 moles of cyanide per mole of extractable copper which reduces divalent copper to monovalent copper and solubilizes the copper as cuprocyanide

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leaching of gold from copper rich ores

The leaching and adsorption behaviour of gold ores 44 the effect of copper cyanide on gold leaching from oxide and sulphide ores 110 45 summary 114 chapters preg-robbing phenomena in the cyanidation of gold ores 116 51 objectives of this chapter 116 52 background information 116 53 preg-robbing behaviour by the ores

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Gold extraction

Thiosulfate leaching has been proven to be effective on ores with high soluble copper values or ores which experience preg-robbing the absorption by carbonaceous components which preferentially absorbs gold and gold-cyanide complexes Leaching through Bulk Leach Extractable Gold or BLEG is also a process that is used to test an area for gold

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Cyanide Management by SART

Telfer Gold Mine treats both gold/copper oxide and sulfide ores in a remote location in the Great Sandy Desert Western Australia Currently the oxide gold ore is treated in a conventional CIL circuit by blending the low and high grade copper ores to minimize cyanide consumption and allow smooth operation The sulfide ore is treated

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Modeling the cyanide heap leaching of cupriferous gold

A mathematical model of cyanidation heap leaching of cupriferous gold ores which includes the speciation of all cyanide cyanate thiocyanate hydroxide and sulfate complexes and their corresponding copper and gold precipitates was developed to facilitate the treatment of these complex ores

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(PDF) Treatment of a Copper

Treatment of a Copper-Rich Gold Ore by Ammonia Assisted Cyanide Leaching have been successful This paper reviews some of the recent applied and fundamental studies on the leaching of copper–gold ores with the ammonia–cyanide system and provides insights into the mechanism to give a better appreciation of the key parameters required for

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Gold leaching by organic base polythionates new non

19-11-2016The article present a review on own experimental and some published data which are related with the gold leaching It is well-known that the most common and usual process of the leaching with cyanide can be dangerous needs a great water consumption and additional costs for remediation of the poisoned and toxic sites

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Study on gold extraction from an oxidized gold ore with

Gold extraction was studied from a gold ore with copper by ammonia cyanide leaching in the paper as well as copper removal from pregnant solutions The leaching results showed that in certain conditions satisfactory technical indexes could be obtained with leaching residues grade of 0 38 g / t average mass concentration of gold and copper in

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US3463710A

copper cyanide ore solution leaching Prior art date 1965-03-30 Legal status (The legal status is an assumption and is not a legal conclusion Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed ) Expired - Lifetime Application number Inventor George William Lower

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NAVER 학술정보 A review of the selective leaching of

Ammonia-cyanide leach system reviewed with focus on past 25 years of research and commercial applications System selectively leaches gold over copper with 10% NaCN consumption compared to ammonia-free system Mechanism discussed and understood allowing process control to be optimised Recovery of gold discussed with developments in

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Heap Leaching and its Application to Copper Uranium

severe cases Cement limestone or fly ash are used for heap leaching gold ores with cyanide and could be considered for alkaline heap leaching of uranium ores or ammonia leaching of copper oxide ores ) Agglomeration is generally carried out in a rotating drum 3

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the plant of copper leaching with ammonia

Ammonia/nitric Acid Leaching of Copper- Cobalt Oxidized the best leaching efficiency for copper in their feasibility of copper leaching from an industrial sludge using ammonia solution This present work will develop the effect of nitric acid/ammonia ratio on the leaching of rich - cobalt copper

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Going for gold Alternative processing methods

17-1-2014Thiosulfate was chosen for in-situ or in-place leaching of gold as it is more environmentally friendly than cyanide however its stability and rate of gold recovery is typically not as good as cyanide But "when it is used with copper-ammonia as an oxidant for treating gravity concentrates the gold leach rate can be higher than cyanide

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Alternative lixiviants to cyanide for leaching gold ores

Effect of silver in thiosulfate leaching of gold-silver alloys in the presence of copper and ammonia relative to pure gold and silver Oraby E Browner Richard Nikraz Hamid ( 2014 ) One promising alternative to cyanide for the leaching of gold is thiosulfate due to its low toxicity and efficiency in leaching gold from low-grade and carbonaceous ores and concentrates

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gold leaching copper

Gold Cyanide Solution (Leaching Gold With Cyanide) Since the 1890's cyanide has been used to recover gold from gold bearing ores And today over 115 years later most of the worlds gold is recovered with cyanide playing a large part in the beneficiation of the yellow precious metal Gold and copper leaching from gold-copper ores and

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Procedure for processing sulphide gold

SUBSTANCE procedure for processing sulphide gold-copper concentrates with extraction of gold consists in cyanide leaching with additives of ammonia compounds at molar ratio NH 3 CN=1-3 Also cyanide leaching is performed at concentrations of sodium cyanide 0 05-0 15 g/l in leaching solution under conditions of automatic stabilisation of pH of solution and concentration of sodium cyanide

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FLOTATION AND LEACHING AT ANGLO ASIAN MINING'S

Azerbaijan The ore body is a complex copper-gold porphyry deposit comprising intermixed oxidized transition and sulphidic gold and copper-bearing ores Gold in the sulphide ores is generally not refractory and is recoverable by cyanide leaching but the secondary copper minerals which are also cyanide soluble lead to high cyanide consumptions

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A Review of Ammoniacal Thiosulfate Leaching of Gold An

ABSTRACTThis literature review provides an update of ammoniacal thiosulfate as a potential lixiviant of gold the history of thiosulfate leaching and recent progress on thiosulfate leaching of gold as well as the production oxidation and stabilization of thiosulfate The leaching results of different types of gold ores including oxide

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Leaching of Gold

A wide variety of copper-bearing gold ores exist throughout the world which have yet to be processed economically for gold recovery The copper minerals present in these ores can be many and varied and usually result in high cyanide consumptions and problematical levels of copper in leach solutions The copper content is often assessed as

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leaching of copper gold ore by ammoniacal flotation cell

gold tailings cyanide leaching africa gold miners like gold leaching plant gold refinin low cost copper leaching equipments gold leaching chemicals double impeller leaching agitation tank for molybdenum direct factory gold leaching accounts charts newest leaching agitation tanks allis chalmers copper leaching of gold ores golden cedar

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Alternative lixiviants to cyanide for leaching gold ores

Effect of silver in thiosulfate leaching of gold-silver alloys in the presence of copper and ammonia relative to pure gold and silver Oraby E Browner Richard Nikraz Hamid ( 2014 ) One promising alternative to cyanide for the leaching of gold is thiosulfate due to its low toxicity and efficiency in leaching gold from low-grade and carbonaceous ores and concentrates

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A Study of the Effect of Djurliete Bornite and

The ammonia-cyanide leaching of slurry with djurleite proved to be more effective than cyanidation producing comparable extraction of gold (99%) while reducing the cyanide consumption from 5 8 to 1 2 kg/t NaCN Lead nitrate improved the Hunt leaching The lower cyanide consumption is associated to a significant reduction of copper dissolved

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The mechanism of gold extraction and copper

The cyanide-ammonia system is known as an alternative system for the treatment of complex copper-gold ores Thermodynamic research on the Au Cu(Cu2O Cu2S) CN− NH4+ O2 OH− H2O systems resulted in producing log(mol)-mol diagrams and δG values for relevant reactions In log(mol)-mol diagrams the thermodynamic possibility of the

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