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alternative lixiviants to cyanide for leaching gold

The leaching of gold, silver and their alloys in alkaline

2017 10 4 · The leaching of gold, silver and their alloys in alkaline glycineperoxide potential alternative lixiviants for gold and/or silver Thiosulphate, acidic thiocyanate, halides, thiourea and a range of more exotic organic The main challenge in developing substitutes for cyanide is that the alternative for gold extraction should be

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An Overview of the EnviroLeach Gold Recovery Process

2017 3 27 · An Overview of the EnviroLeach Gold Recovery Process Conventional gold mining operations rely heavily on cyanide leaching as the predominant method for recovering gold from ores and These alternative lixiviants have to offer comparable leach kinetics,

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CHLORIDE HYPOCHLORITE OXIDATION AND LEACHING

2012 10 4 · Chloridehypochlorite oxidation and leaching of refractory sulfide gold concentrate 63 Fig 1 The Pourbaix diagram of FeS at = 10 4 M, = 10 M and 25 C (the chlorine species regions are also marked) (Marsden and House, 2005) Fig 2

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Alternative Leaching Reagents for Gold SpringerLink

2018 10 7 · Sodium cyanide has been the preponderant leaching reagent for gold due to its excellent extractions from a great variety of ores and its low cost Although cyanide is poisonous, it has safe industrial and environmental records at the high pH range required in cyanide leaching

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Gold leaching by organic base polythionates: new

2016 11 19 · Gold leaching is the key stage in process of gold mining There are a few well reputed leaching methods using a variety of different reagents Nowadays the most popular industrial processes include cyanide, thiourea, and thiosulfate leaching methods

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Alternatives to cyanide in the gold mining industry:

Cyanide has been used for over a century at gold mines all over the world and the evidence is overwhelming that in well designed and properly managed mining operations, cyanide can be safely used as a gold leaching reagent without significant risk to human life or the environment

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alternative lixiviant for gold leaching

alternative lixiviants in hydrometallurgical processes for gold recovery from gold scrap leaching of gold, there has not been any commercial introduction of this Thiosulphate as an alternative to cyanide for gold

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Thiosulphate as an alternative to cyanide for gold

2017 6 4 · The gold industry has been seeking alternative reagents for leaching gold from low grade ores for the past 25 years The cost and transport of cyanide, the poor compares alternative lixiviants such as cyanide and chloride/hypochlorite In general, the rate of leaching with

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Iberian Develops New Enviro Friendly Alternative to

2018 5 30 · Alternative lixiviants or leaching agents should also be inexpensive and recyclable, selective, non toxic and compatible with downstream recovery processes There is an increasing interest in finding new alternatives or improving previously tried processes

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An Overview of the EnviroLeach Gold Recovery Process

2017 3 27 · An Overview of the EnviroLeach Gold Recovery Process Conventional gold mining operations rely heavily on cyanide leaching as the predominant method for recovering gold from ores and These alternative lixiviants have to offer comparable leach kinetics,

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Application of alternative lixiviants for secondary

Alternative lixiviants for gold comprising chlorine, thiourea and thiosulphate were compared with cyanide using bottle roll tests Chlorine was subsequently selected for column leaching tests Column tests at 1 0, 0 1 and 0 01 gL 1 Cl2 at pH 2 were conducted

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Alternatives to Cyanide in the Gold Mini Cyanide

most widely researched alternative lixiviants for gold ores are examined in this paper, but it This paper has reviewed the most promising alternative gold leaching agents to cyanide Documents Similar To Alternatives to Cyanide in the Gold Mini 5070_s04_qp_1 Uploaded by mstudy123456 NTSE Uploaded by Anup Jogdand

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A Kinetic Study That Compares the Leaching of Gold in

2017 8 27 · A Kinetic Study That Compares the Leaching of Gold in the Cyanide, Thiosulfate, and Chloride Systems M I JEFFREY, P L BREUER, and W L CHOO amount of research into viable alternative lixiviants This article presents a detailed kinetic study of gold leaching in cyanide, ammonia/thiosulfate, and chloride/hypochlorite solutions The

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Alternative Lixiviants to Cyanide for Leaching Gold

In cases where cyanide consumption is high, such as the reaction of cyanide with copper minerals, alternative lixiviants, such as thiosulfate leaching, can be more favorable than cyanide for leaching gold (Monhemius and Ball, 1995, Dai et al , 2013)

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Thiosulfate Leaching as an Alternative to Cyanidation

The thiosulfate leaching has been applied to several mild refractory gold ores, such as, complex ore, refractory carbonaceous ores, copper bearing gold ores, ores containing lead and zinc, gold ores associated with sulfide minerals and the gold ore associated with manganese

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Alternatives to cyanide in the gold mining industry:

The most widely researched alternative lixiviants for gold ores are examined in this paper, but it is evident that none has yet made any significant inroad into the dominant position of cyanide as the reagent of choice at the vast majority of gold mines worldwide

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ROSIA MONTANA GOLD CORPORATION S A

2012 2 26 · Leaching is by far the most common process with over 90 of the worlds gold production over the last 20 years being provided by cyanidation Cyanidation is the most common leaching alternative for gold and silver

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FLOWSHEET AND LEACHING ALTERNATIVES FOR THE

2012 2 26 · Discusses the leaching alternatives (alternative lixiviants) Presents a toxicological assessment of the alternatives Provides the supporting dialogue presenting cyanide leaching as the best available technique

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strong technology leading gold cyanide cil

2018 4 6 · Gold and silver typically occur at very low concentrations in ores less than 10 and chemical forms, including solid briquettes, flake cyanide and liquid cyanide into the process, the technologies used for gold and silver recovery are the same leached with the CIL process, or following leaching with the CIP process

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Chloride as an Alternative to Cyanide sgs com

2015 12 16 · consequence, a renewed effort has been launched to find suitable alternative lixiviants to recover gold provides an alternative to cyanide for gold ores The process generates oxidizing conditions in the the copper leaching conditions, cyanide consumption can be prohibitively high

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Alternatives to cyanide in the gold mining

The most widely researched alternative lixiviants for gold ores are examined in this paper, but it is evident that none has yet made any significant inroad into the dominant position of cyanide as the reagent of choice at the vast majority of gold mines worldwide

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substitute for gold ore

Alternative Lixiviants to Cyanide for Leaching Gold Ores Over the past three decades, a significant amount of literature has examined alternative extraction processes to cyanide for recovering gold

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Thiosulphate as an alternative to cyanide for gold

2017 6 4 · The gold industry has been seeking alternative reagents for leaching gold from low grade ores for the past 25 years The cost and transport of cyanide, the poor compares alternative lixiviants such as cyanide and chloride/hypochlorite In general, the rate of leaching with

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Advances in Gold and Silver Processing

2016 8 3 · HYPOCHLORITE LEACHING OF GOLD ORE W T Yen, R A Pindred and M P Lam Mining Engineering, Queen's University than other lixiviants Due to the interference of impurities, gold extraction from an ore gold dissolution in a cyanide solution Fig 1 30 vV v 0 5 9 NaOCl 20 0 1 1 I I I

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MURDOCH RESEARCH REPOSITORY

2012 12 10 · 1 Application of Alternative Lixiviants for Secondary Heap Leaching of Gold A Nikoloski1 and N Stockton2 ABSTRACT Some preliminary results on the secondary leaching of

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Dissolution Chemistry of Gold and Silver in Different

2007 4 27 · Cyanide has been recognized for a long time as a powerful lixiviant for gold and silver, forming very stable cyano complexes with both metals While cyanide is very effective in leaching free milling ores, there are certain classes of gold and silver ores (i e , carbonaceous, pyritic arsenical, manganiferous, cuperferous) that are considered refractory to conventional cyanidation dissolution

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Alternatives to cyanide in the gold mining industry:

2010 10 26 · Abstract/Summary This paper reviews a series of alternative lixiviant systems for the recovery of gold from ores and concentrates For over 100 years, cyanide has been the leach reagent of choice in gold mining because of its high gold recoveries, robustness and relatively low costs

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COMPARISON OF CYANIDE AND THIOSULPHATE

2017 9 22 · Gold cyanidation is the main gold leaching process and it has been used over century Cyanide is relatively low cost and effective lixiviant for gold dissolution; gold is dissolved 20

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Chloride as an Alternative to Cyanide sgs com

2015 12 16 · consequence, a renewed effort has been launched to find suitable alternative lixiviants to recover gold provides an alternative to cyanide for gold ores The process generates oxidizing conditions in the the copper leaching conditions, cyanide consumption can be prohibitively high

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Gold leaching in thiosulfate solutions and its

Finding alternative lixiviants is one solution that would decrease the uses of these toxic chemicals Thiosulfate is one of the most promising alternative substitutes to cyanide kinetically and environmentally Gold leaching in thiosulfate solutions was evaluated environmentally and kinetically in different ways: (1) applying a closed system to

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