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Microbial oxidation of refractory gold sulfide concentrate

Refractory gold-bearing ores are characterized by containing submicroscopic gold particles occluded in sulfide minerals such as pyrite and arsenopyrite Under these conditions gold cannot be recovered efficiently without an oxidative pretreatment such as roasting chemical oxidation or

Extraction of Gold Then Now and the Future

Quantifies the submicroscopic gold in sulfide and other minerals gives amount of gold that can be recovered by employing pre-oxidation or biooxidation Determines the reasons(s) for high gold losses to tailings and opportunities to improve gold recovery Determines any other valuable metals (such as

the gold strike pressure oxidation plant process

Pressure Oxidation Pressure oxidation is employed to liberate gold and silver in refractory sulfide concentrates often and ores The main pressure oxidation products from iron sulfide minerals are sulfuric acid (and metal sulfates) and hematite Depending on the conditions within the autoclave acid containing iron compounds can be formed

pretreatment of refractory sulphide gold ores and concentrates

Refractory Gold Ore Treatment Methods At the plant of the Consolidated Murchison Co in the Transvaal South Africa where a refractory high-antimony gold ore is being treated flotation and cyanidation of the flotation concentrates and tailings are being practiced

Sherritt International

Sherritt's pressure oxidation process has several advantages over other processes used commercially to treat refractory gold feeds: Conversion of iron and arsenic in the feeds to environmentally stable hematite ferric arsenate and ferric arsenate sulphate solids during the pressure oxidation process

Autoclave pressure oxidation gold au c grinding mill china

autoclave pressure oxidation gold au grinding mill china Autoclave Pressure Oxidation Gold Au Grinding find details about china grinder mill high pressure More Info autoclave gold plant - spitseu Gold extraction refers to the processes required to extract Pressure oxidation is an aqueous process for sulfur removal carried out in a

high pressure oxidation of refractory gold minerals

high pressure oxidation of refractory gold minerals high pressure oxidation of refractory gold minerals An acidic pressure oxidation pretreatment of refractory gold concentrates from the 75% gold recovery and is characterised by high gold values in the residue pressure particle size and matrix of the sulphide host minerals is described

pressure oxidation Archives

"Pressure oxidation was selected as the most feasible processing technology for double refractory ores It is able to achieve gold recoveries of 96% by utilising high temperatures elevated pressure and oxygen to recover encapsulated gold while conventional cyanidation methods would result in

mining project presure of oxidation gold concentrate china

high pressure oxidation of refractory gold minerals diagnostic leaching for refractory gold ores srk gold recovered during stage 1 would be considered non refractory and could be recovered by standard gravity concentration gold extracted during the next four stages indicates minerals that the gold occurs with and suggests process options such as pressure oxidation biooxidation or roasting

Gold Mining Process Development – Denver Mineral Engineers

The common definition of "refractory" gold ores are those ores that do not allow the recovery of gold by standard gravity concentration or direct cyanide leaching One major category of refractory ores are gold values contained within the crystalline structure of sulfide minerals such as pyrite and arsenopyrite

Autoclave Pressure Oxidation Gold Au Grinding Mill China

High Pressure Oxidation Gold Korffdejong Autoclave pressure oxidation gold au - ellulnl autoclave pressure oxidation gold au grinding mill china gold processing preparation of the ore for use in various productsgold au melts at a temperature of c 1 f the mill and continuing grinding until the gold has dissolved in the mercuryoxidation can also be accomplished by the use of

Pressure Oxidation Process

Outotec can provide a complete pressure oxidation plant including all auxiliary processes for refractory gold sulfide oxidation Gold is efficiently released from the sulfide matrix for the subsequent leaching process whether cyanidation or chloride leaching The Outotec pressure oxidation main process steps: Carbonate and chloride removal Pressure oxidation Gas scrubbing Conditioning (hot curing) Solid

An acidic pressure oxidation pre

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

A FUNDAMENTAL STUDY OF THE ACIDIC PRESSURE

The acidic pressure oxidation of pyrite (FeS 2) and orpiment (As 2S 3) as a pretreatment of refractory gold ores has been studied by investigating the reaction chemistry and kinetics The effects of retention time temperature particle size oxygen partial pressure pulp density sulfuric acid concentration and cupric ions were evaluated for both

The Leachox™ Refractory Gold Process

oxidation plant currently operating worldwide and represents a major breakthrough in the treatment of traditionally difficult to process refractory gold ores he process offers a low T capital and operating cost route but with similar high gold recoveries to bio -oxidation INTRODUCTION The Problem of Refractory Ores

pressure leaching of refractory silver ore

PRESSURE OXIDATION OF REFRACTORY GOLD ORES - Pressure Oxidation Pressure oxidation is employed to liberate gold and silver in refractory sulfide concentrates often and or The main pressure oxidation products from iron sulfide minerals are sulfuric acid (and metal sulfates) and hematite Depending on the conditions within the autoclave acid containing iron compounds can be formed

Autoclave pressure oxidation gold au c grinding mill china

high pressure oxidation of refractory gold minerals autoclave pressure oxidation gold au Pressure Oxidation is a robust process for recovering metals including refractory gold high pressure oxidation (HiPOX) and ACTIVOX autoclave leaching Get Quote autoclave pressure oxidation gold au grinding mill china of making high grade sand and matched equipments pressure oxidation to extract

Gold recovery: Effect of ozonation on refractory gold ores

leaching of refractory ores results in incomplete gold recoveries as a solution a pre-treatment process should be implemented Various pre-treatment methods includes roasting bio- oxidation high-pressure cyanide leaching and pressure oxidation With the

pressure oxidation of nickel

Jan 14 2009 Pressure oxidation of refractory gold ores finally came into its own in the 1980s as a healthy gold price encouraged the exploitation of refractory gold ore deposits (21) Sherritt has played a significant part in the commercialization of pressure oxidation for refractory gold ores

Gold processing 101

At current gold prices this is worth about US$600 Both smelter treatment charges and oxidation or bio-leach costs are at least $200/t of concentrate and payables/recovery in the 90% range so a minimum GSR for effective downstream processing is around 0 5 Clearly this is a function of gold price

Polymetal to expand pressure oxidation gold treatment in

"Pressure oxidation was selected as the most feasible processing technology for double refractory ores It is able to achieve gold recoveries of 96% by utilising high temperatures elevated pressure and oxygen to recover encapsulated gold while conventional cyanidation methods would result in sub-optimal recovery rates of 20-40%

pressure oxidation of nickel

Jan 14 2009 Pressure oxidation of refractory gold ores finally came into its own in the 1980s as a healthy gold price encouraged the exploitation of refractory gold ore deposits (21) Sherritt has played a significant part in the commercialization of pressure oxidation for refractory gold ores

refractory ore processing

High grade ores and ores resistant to cyanide leaching at coarse particle sizes require further processing in order to recover the gold values The processing techniques can include grinding concentration roasting and pressure oxidation prior to cyanidation Wikipedia Text under CC-BY-SA license Refractory Gold Ore Treatment Methods

Effect of Pretreatment of Sulfide Refractory Concentrate

Pressure oxidation typically operates at moderate temperature and pressure temperatures of 60˚C to 80˚C and an oxygen pressure of 60 to 80 psi Under these con- ditions the sulfide sulfur is oxidized to sulfate 1 2 Alkaline Oxidation Arsenopyrite has an economic importance when there is more of it than gold in the ore Oxidation of arsenopyrite

A FUNDAMENTAL STUDY OF THE ACIDIC PRESSURE

The acidic pressure oxidation of pyrite (FeS 2) and orpiment (As 2S 3) as a pretreatment of refractory gold ores has been studied by investigating the reaction chemistry and kinetics The effects of retention time temperature particle size oxygen partial pressure pulp density sulfuric acid concentration and cupric ions were evaluated for both

PRESSURE OXIDATION OF REFRACTORY GOLD ORES: THE

Pressure Oxidation Pressure oxidation is employed to liberate gold and silver in refractory sulfide concentrates often and ores The main pressure oxidation products from iron sulfide minerals are sulfuric acid (and metal sulfates) and hematite Depending on the conditions within the autoclave acid containing iron compounds can be formed

Ultra Fine Grinding

The traditional approach for such refractory material has been to liberate the locked gold by chemically destroying the pyrite through oxidation Roasting pressure oxidation and bacterial oxidation all employ various degrees of temperature pressure and catalysis to react the pyrite with oxygen to produce an iron oxide and sulphur by-products

pressure oxidation gold mining

pressure oxidation gold plant - appartamentovacanzeromait Pressure Oxidation Plants For Gold Mining - Located in the Russian Far East the Amursk hub is the first gold pressure oxidation plant in Russia It includes two high-grade refractory gold deposits Contact Supplier autoclave for gold mining LectNote1 - tahija13

Autoclave Pressure Oxidation Gold Au Grinding Mill China

Autoclave Pressure Oxidation Gold Au Grinding Mill China Roasting is the only commercialised process in zimbabwe for the pre-treatment of refractory gold feedstocks for the subsequent cyanidation leachinghis process results in only about 75 gold recovery and is characterised by high gold values in the residue pressure oxidation process in an autoclave has been evaluated as an alternative

Valves for autoclaves – pressure oxidation ( POX)

for the refractory ore is autoclave pressure oxidation (POX) This method is often used in the extraction of gold in cases where the gold is trapped in sulphide minerals such as pyrite and arsenopyrite Even though gold processing plants are the most common users of POX

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