Leaching Gold Sulfides

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A fundamental study of the alkaline sulfide leaching of gold

A fundamental study of the alkaline sulfide leaching of gold MI Jeffrey1* and CG Anderson2 1 Department of Chemical Engineering, Monash University, Vic, 3800, Australia 2 The Center for Advanced Mineral and Metallurgical Processing, Montana Tech of the University of Montana, Butte, Montana, 59701, USA

Sulphide Leaching - Mineral Processing & Metallurgy

Methods of leaching sulphide ores can be: in absence of oxidizing agents in presence of oxidizing agents Bacterial leaching Absence of oxidizing agents Acid leaching: Dilute acids dissolve some metal sulphides with liberation of H2S, eg ZnS + 2H+ ^ Zn2+ + H2S Three types of sulphides can be encountered Completely soluble sulphides: Zns, CoS, NiS, FeS Slightly soluble, eg FeS2

Recovery of Gold in Pyritic Sulfide Ores - Mine EngineerCom

information on pyrtiric gold, leach Recovery of Gold in Pyritic Sulfide Ores The now extinct Us Bureau of Mines conducted numerous studies of gold in pyrite, and sulfide ores over the years, until their untimely demise in the 1990's

Alkaline Sulfide Gold Leaching Kinetics - researchgatenet

1 Alkaline Sulfide Gold Leaching Kinetics CG Anderson1 1Kroll Institute for Extractive Metallurgy George S Ansell Department of Metallurgical and Materials Engineering Colorado School of Mines

A fundamental study of the alkaline sulfide leaching of gold

This can be viewed as follows (5) S X2 − + ( X − 1) SbS 33− → ( X − 1) SbS 43− + S 2 − In the present paper, a kinetic study of gold leaching in alkaline sulfide solutions is presented For the gold leaching system, both a complexing lixiviant and an oxidant are required to effect dissolution

CHLORIDE HYPOCHLORITE OXIDATION AND LEACHING OF …

Chloride–hypochlorite oxidation and leaching of refractory sulfide gold concentrate 63 Fig 1 The Pourbaix diagram of Fe–S at [Fe] –= 10 4 M, [S] = 10– M and 25 C (the chlorine species regions are also marked) (Marsden and House, 2005) Fig 2

Cyanide Leaching Of Gold - Mine EngineerCom

Carbonaceous gold ores can have the carbon adsorb the gold onto its surface, and as a result will not be recovered from the pregnant solution Leaching gold from sulfide ores is difficult, at best Generally, the recovery for cyanide leaching of sulfide or refractory ores is no better than 30%, which is not a worthwhile venture

Sulfides - Gold Recovery Methods - ICMJ's Mining Journal

Sep 04, 2015 · We have had great sucess recovering gold from sulfides with out thiourea based solution Our recovery rate is usually 94 to 96% The key to recovery with sulfides is the grind size of the ore while leaching to make sure that your leach solution can make Co tact with the precious metal

THE ALKALINE SULFIDE HYDROMETALLURGICAL SEPARATION

22 Selective Recovery of Gold from Alkaline Sulfide Solutions In the example cited above, it is essential in that any gold leached in the alkaline sulfide solutions be recovered As shown in Figure 3, gold is soluble in the alkaline sulfide system Gold lixiviation is the result of leaching by polysulfides and sulfides as shown in equation 8

Sulfide Ore Processing « TCB Metals and Refining

Sulfide Ore Processing; Placer Gold; Sulfide Ore Processing our vibratory grinder on our circuit allows our leach to make contact with the precious metal encapsulated in the sulfide so leaching can occur With the aggressive nature of our leach allowing us to process most ores in an hour, our process allows us to contain the amount of

Sulfides, Selenides and Tellurides: rebellious and

Many sulfide minerals also contain things like copper or antimony that can react with the cyanide, preventing the cyanide from leaching out the gold and silver For information on methods to deal with and extract gold, silver and base metals from these refractory ores, I …

A fundamental study of the alkaline sulfide leaching of gold

This can be viewed as follows (5) S X2 − + ( X − 1) SbS 33− → ( X − 1) SbS 43− + S 2 − In the present paper, a kinetic study of gold leaching in alkaline sulfide solutions is presented For the gold leaching system, both a complexing lixiviant and an oxidant are required to effect dissolution

Alkaline sulfide gold leaching kinetics - ScienceDirect

A literature survey of the alkaline sulfide gold leaching system has been provided Abstract Recently, leaching of gold with cyanide has come under scrutiny for its possible detrimental effects to the environment Also, in some gold bearing ores and concentrates, conventional cyanide leaching is not the best method for gold extraction

Associated Sulfide Minerals in Thiosulfate Leaching of

leaching rate but also increase the consumption of thiosulfate Comparable gold extractions were observed in the leaching of the composite ores containing various sulfide minerals, such as pyrite, pyrrhotite, chalcocite, galena and chalcopyrite The leaching of gold in the presence of iron sulfides was also improved by

leaching gold sulfides - supremewheelscoza

Simultaneous sulfide oxidation and gold leaching of a refractory Dec 20, 2017 Request (PDF) Simultaneous sulfide In this research, oxidation of sulfide and leaching of gold from a gold–bearing sulfide concentrate using chloride–hypochlorite solution has been investigated

Leaching of a Gold Bearing Partially Roasted Sulphide

Leaching of a Gold Bearing Partially Roasted Sulphide Laboratory Scale Studies MF Almeida* Faculdade de Engenharia da Universidade do Porto, Rua Dr Roberto Frias s/n, 4200-465 Porto, Portugal Received: June 19, 2001; Revised: October 12, 2001 This research aimed at defining a route for recovering precious metals from a very heterogeneous

The effect of sulfide minerals on the leaching of gold in

For gold leaching in the presence of sulfide minerals, there are two major mechanisms by which the sulfide can impact on the gold leaching rate (a) through the galvanic interaction between gold and the conducting mineral in contact with gold and (b) through the dissolution of the mineral which impacts on the solution speciation

Recovery of Silver, Gold, and Lead From a Complex Sulfide

RECOVERY OF SILVER, GOLD, AND LEAD FROM A COMPLEX SULFIDE ORE USING FERRIC CHLORIDE, THIOUREA, AND BRINE LEACH SOLUTIONS By R G Sandberg 1 and J L Huiatt 2 ABSTRACT The Bureau of Mines investigated a hydrometallurgical procedure to re­ cover gold, silver, and byproduct lead from a complex lead-zinc sulfide ore

Sulphide Gold | Gekko

Because cyanide cannot always leach sulphide-associated gold, regrinding the ore is typically required to expose the free gold for recovery by intensive leaching Critically, the size at which one can efficiently liberate gold from the host mineral of the particle will determine the process to use for optimal gold …

Gold extraction - Wikipedia

Gold extraction refers to the processes required to extract gold from its oresThis may require a combination of comminution, mineral processing, hydrometallurgical, and pyrometallurgical processes to be performed on the ore Gold mining from alluvium ores was once achieved by techniques associated with placer mining such as simple gold panning and sluicing, resulting in direct recovery of

Fundamentals and applications of alkaline sulfide leaching

INTRODUCTION As alkaline sulfide leaching of gold has its roots in the development and industrial application of nitrogen species catalyzed pressure leaching for partial oxidation of sulfides, a discourse in this topic is relevant As well, the use of nitric acid in metal sulfide oxidation is not new

Cyanide Leaching Of Gold - Mine EngineerCom

Carbonaceous gold ores can have the carbon adsorb the gold onto its surface, and as a result will not be recovered from the pregnant solution Leaching gold from sulfide ores is difficult, at best Generally, the recovery for cyanide leaching of sulfide or refractory ores is no better than 30%, which is not a worthwhile venture

Gold leaching by organic base polythionates: new non-toxic

Method of gold recovery from sulfide auriferous ores has already been proposed (Smolyaninov et al 2010b) The invention relates to the method of gold recovery from powdered sulfide auriferous ores after their unlocking by bacterial leaching or by oxidation roasting, or by autoclave oxidation Gold leaching by polythionates (new non-toxic

Effect of Pretreatment on Leaching Primary Copper Sulfide

The aim of this study was to improve the dissolution of copper sulfide ore composed mainly of chalcopyrite (121 wt %) and bornite (054 wt %) using a pretreatment before leaching The effect of the pretreatment on copper sulfide dissolution was investigated using different types of leaching Three sets of experimental tests were performed (flask, reactor and mini-column)

leaching gold sulfides - supremewheelscoza

Simultaneous sulfide oxidation and gold leaching of a refractory Dec 20, 2017 Request (PDF) Simultaneous sulfide In this research, oxidation of sulfide and leaching of gold from a gold–bearing sulfide concentrate using chloride–hypochlorite solution has been investigated

Leaching - GOLD PROSPECTING - Nugget Shooter Forums

Nov 22, 2010 · Gold needs to be released from the sulfides prior to leaching as well A shaker table or a wave table will recover the majority of the gold without the use of leaching I would run some of the material through a table and then send in a good sample to be assayed and see if there is a worthwhile amount of gold that you are not

Direct Leaching of sulfides: Chemistry and applications

Abstract The sulfide minerals associated with copper, nickel, zinc, lead, and molybdenum concentrates are described according to their thermodynamic stability zones on Eh-p H diagramsFrom these zones, the chemistry associated with various thermodynamically feasible decomposition paths is discussed, and process developments associated with the most favorable decomposition paths are briefly

Alkaline Sulfide Gold Leaching Kinetics - MAFIADOCCOM

Alkaline Sulfide Gold Leaching Kinetics CG Anderson1 1 Kroll Institute for Extractive Metallurgy George S Ansell Department of Metallurgical and Materials Engineering Colorado School of Mines Golden, Colorado 80401 (*Corresponding author: [email protected]) ABSTRACT Recently, leaching of gold with cyanide has come under scrutiny for its possible detrimental effects to the environment

ELECTROCHEMICAL PROCESSES IN THE LEACHING OF METAL

T1 - ELECTROCHEMICAL PROCESSES IN THE LEACHING OF METAL SULFIDES AND OXIDES AU - Hiskey, J Brent AU - Wadsworth, Milton E PY - 1981 Y1 - 1981 N2 - The kinetics of several metal sulfide and oxide systems are explained by electrochemical reactions related to mixed potentials which form as a result of coupled anodic and cathodic processes

THIOSULFATE LEACHING OF SILVER FROM A SOLID RESIDUE …

leach sulfides, that is bornite and chalcocite Furthermore, a significant amount of pyrite additionally enhances the copper leaching rate by galvanic effects (Chmielewski, 2012) A series of thiosulphate leaching experiments was conducted The effect of thiosulfate ammonia copper ions concentration on silver leaching efficiency

Bacterial Leaching of Metal Sulfides Proceeds by Two

Bacterial leaching, the biooxidation of metal sulfides to soluble metal sulfates and sulfuric acid, is effected by specialized bacteria Three species of mesoacidophilic, chemolithotrophic bacteria are mainly involved: Thiobacillus ferrooxidans, Thiobacillus thiooxidans, and Leptospirillum ferrooxidansT ferrooxidans oxidizes reduced sulfur compounds to sulfate and iron(II) to iron(III) ions

A Kinetic Study Of Gold Leaching In CuBr -NaBr System

A Kinetic Study Of Gold Leaching In CuBr 2-NaBr System Encinas-Romero Martín A*, Tiburcio-Munive Guillermo and Yánez-Montaño Mireya Department of Chemical Engineering and Metallurgy, University of Sonora, Hermosillo, Sonora 83000, México *[email protected] Abstract—The CuBr 2-NaBr system was applied

US7682420B2 - Method for leaching gold - Google Patents

In a method for leaching gold from copper sulfides, the sulfide ores are first subjected to leaching of copper, thereby producing a leaching residue having 79% or less of the copper content This leaching residue is mixed with a leach liquor, which contains the chloride ion and ferric ion and has 19 or less of pH Gold and copper can be effectively leached from the copper sulfide ores

Alkaline Oxidative Leaching of Gold-Bearing Arsenopyrite …

ALKALINE OXIDATIVE LEACHING OF GOLD-BEARING ARSENOPYRITE ORES By P Bhakta,1 J W Langhans, Jr,1 and K P V Lei2 ABS"rRACT The US Bureau of Mines developed an alkaline oxidative pretreatment leaching procedure to increase the recovery of gold from arsenopyrite (FeAsS) ores The best solution compositions for

CA2599174C - Method for leaching gold - Google Patents

In a method for leaching gold from copper sulfides, the sulfide ores are first subjected to leaching of copper, thereby producing a leaching residue having 79% or less of the copper content This leaching residue is mixed with a leach liquor, which contains the chloride ion and ferric ion and has 19 or less of pH Gold and copper can be effectively leached from the copper sulfide ores

Gold and silver recovery from polymetallic sulfides by

Nov 09, 2007 · Gold and silver recovery from polymetallic sulfides by treatment with halogens Nov 9, 2007 - Nichromet Extraction Inc A method for treating a polymetallic sulfide ore containing gold and/or silver, and further containing base metals selected from the group consisting of iron, aluminum, chromium, titanium, copper, zinc, lead, nickel, cobalt

ST-GEORGES ECO MINING LTD » High MgO Sulfides Leaching

High-pH leaching of high MgO sulfide ores R&D Initiative Summary Low grade nickel sulfide ores often contain magnesium bearing minerals that report to the concentrates making them difficult to smelt High MgO concentrates can also be difficult to treat hydrometallurgically as the MgO minerals can consume large amounts of acid and release large amounts of magnesium into the process solutions

ALKALINE SULFIDE RECOVERY OF GOLD UTILIZING NITROGEN

This paper outlines the application of an industrially proven pressure leaching methodology utilizing nitrogen species catalyzed pressure leaching and alkaline sulfide gold leaching As such, it stands as an economic and engineering advancement in pressure leaching and non-cyanide treatment of gold ores and concentrates