pressure oxidation refractory

pressure oxidation refractory

Pressure oxidation

Pressure Oxidation is a process for extracting gold from refractory ore. The most common refractory ores are pyrite and arsenopyrite, which are sulfide ores that trap the gold within them. Refractory ores require pre-treatment before the gold can be adequately extracted.

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.

Pressure Oxidation SGS

Pressure oxidation (POX), high pressure oxidation (HiPOX) and ACTIVOX autoclave leaching are viable industry-standard technologies used to recover gold and other accessory metals. The process is particularly well suited for treating refractory gold ores, which

Pressure Oxidation Process TON Outotec

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

(PDF) Pressure oxidation of double refractory gold

The reasons for gold-bearing materials refractory nature and behaviour features of carbonaceous matter during pressure oxidation of concentrates were

Pressure Oxidation Pretreatment of Refractory Gold

Pressure oxidation of gold containing concentrates and ores is an effective pretreatment for liberating refractory gold. This is particularly true when an appreciable portion of the gold is associated with sulfides and is not amenable to conventional cyanidation.

Research on chlorination leaching of pressure-oxidized

Jun 01, 2020 In this work, the hydro-leaching method consisting of the pressure oxidation pretreatment and chlorination leaching has conducted for the refractory gold concentrate with high sulfur content. XRD and SEM/EDC were used to characterize the refractory gold concentrate and the pretreated gold concentrate.

Pressure Oxidation Circuit

Jan 31, 2018 Partial Oxidation The gold recoveries are generally lower than the theoretical recoveries, this is due to cyanide soluble losses rather than refractory losses. One significant difference between the design test work and the actual plant operating conditions is that higher temperatures and pressures are required in the plant to produce the

PRESSURE LEACHING RPMGlobal

A major revolution in gold processing was the pressure oxidation of refractory, pyritic ores. In these ores, gold is chemically entrained in sulfides which require oxidation prior to standard cyanidation techniques. Many of these plants were built in the western United States in

Pressure Oxidation SGS

Pressure oxidation (POX), high pressure oxidation (HiPOX) and ACTIVOX autoclave leaching are viable industry-standard technologies used to recover gold and other accessory metals. The process is particularly well suited for treating refractory gold ores, which

Pressure oxidation overview ScienceDirect

Jan 01, 2005 Such is the case in the pressure oxidation of refractory gold ores. Often there are advantages to be gained by operating at temperatures above the normal boiling point of the solution and, therefore, at pressures above atmospheric. In such cases, the

Recovery Refractory Resources SGS

Pressure oxidation, or autoclaving, was originally developed for processing base metal concentrates. In the last 30 years, it has been adapted for processing refractory gold ores and concentrates where gold is trapped in sulphide minerals, such as pyrite or arsenopyrite.

Pressure Oxidation Circuit

Jan 31, 2018 Partial Oxidation The gold recoveries are generally lower than the theoretical recoveries, this is due to cyanide soluble losses rather than refractory losses. One significant difference between the design test work and the actual plant operating conditions is that higher temperatures and pressures are required in the plant to produce the

pressure oxidation refractory gold Hitlers Hollywood

pressure oxidation refractory gold. 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

Sun High Pressure Oxidation Of Refractory Gold Minerals

Pressure Oxidation Of Refractory Gold Ores The 2014101Pressure 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

PRESSURE LEACHING RPMGlobal

A major revolution in gold processing was the pressure oxidation of refractory, pyritic ores. In these ores, gold is chemically entrained in sulfides which require oxidation prior to standard cyanidation techniques. Many of these plants were built in the western United States in

Gold extraction

Pressure oxidation is an aqueous process for sulfur removal carried out in a continuous autoclave, operating at high pressures and somewhat elevated temperatures. The Albion process utilises a combination of ultrafine grinding and atmospheric, auto-thermal, oxidative leaching.

Autoclave Technology Hatch

The entire spectrum—or whatever elements are most appropriate to your operation—leads to successful pressure oxidation of refractory ores and sulfide concentrates. We provide the following services: Test-work planning and management Process flow sheet development

Atmospheric alkaline pre-oxidation of refractory sulphide

Four iron-sulphide-containing gold ores from the White Mountain mine in the Jilin Province, China were studied to examine the benefits of using oxidative treatment prior to conventional cyanidation to leach gold. This pre-treatment consisted of bubbling air into an ore/water mixture for eight hours while adding enough caustic sodium hydroxide to maintain a pH of 11 throughout the test. Three

High Pressure Acid Leach & Pressure Oxidation

High Pressure Acid Leach (HPAL) and Pressure Oxidation (POX) testing services provide a unique opportunity to evaluate and optimise the most economically viable process routes for the recovery of most metals such as nickel from lateritic ores and gold from refractory ores. HPAL and POX are commercially proven and tested extraction

What is PRESSURE OXIDATION? What does PRESSURE OXIDATION

theaudiopedia What is PRESSURE OXIDATION? What does PRESSURE OXIDATION mean? PRESSURE OXIDATION meaning PRESSURE OXIDATION defini...

Pressure oxidation of pyrite-arsenopyrite refractory gold

The refractory ore must be destroyed or attacked by chemical means with the use of oxidative processes, such as oxidation by roasting, pressure oxidation, bio-oxidation, and ultrafine grinding.

pressure oxidation Archives International Mining

“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%.

ACID PRESSURE OXIDATION OF REFRACTORY GOLD MINERAL

Jan 01, 1987 Pressure oxidation of these refractory gold mineral carriers is a very complex reaction system involving several oxidation and hydrolytic reactions which occur in series and/or parallel. Moreover these oxidation reactions are highly exothermic. Since the nature and composition of the reaction products can have a considerable impact on the

Pilot plant pressure oxidation of refractory gold-silver

A pilot plant campaign has been conducted by Sherritt Technologies in support of Eldorado Gold Corporation's evaluation of pressure oxidation (POX) technology for the treatment of refractory gold concentrates from the Certej deposit in Romania.

Gold recovery from refractory gold concentrates by

Pressure oxidation technology for the treatment of refractory gold concentrates has been deployed in some countries. Shuiyindong gold deposit is one of the Carlin-type deposits which is a typical difficult-to-treat gold deposit, located in Guizhou province in western China.

pressure oxidation refractory gold Hitlers Hollywood

pressure oxidation refractory gold. 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

Gold extraction

Pressure oxidation is an aqueous process for sulfur removal carried out in a continuous autoclave, operating at high pressures and somewhat elevated temperatures. The Albion process utilises a combination of ultrafine grinding and atmospheric, auto-thermal, oxidative leaching.

High Pressure Acid Leach & Pressure Oxidation

High Pressure Acid Leach (HPAL) and Pressure Oxidation (POX) testing services provide a unique opportunity to evaluate and optimise the most economically viable process routes for the recovery of most metals such as nickel from lateritic ores and gold from refractory ores. HPAL and POX are commercially proven and tested extraction

pressure oxidation Archives International Mining

“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%.

What is PRESSURE OXIDATION? What does PRESSURE OXIDATION

Aug 21, 2017 theaudiopedia What is PRESSURE OXIDATION? What does PRESSURE OXIDATION mean? PRESSURE OXIDATION meaning PRESSURE OXIDATION defini...

Autoclave Technology Hatch

The entire spectrum—or whatever elements are most appropriate to your operation—leads to successful pressure oxidation of refractory ores and sulfide concentrates. We provide the following services: Test-work planning and management Process flow sheet development

Atmospheric alkaline pre-oxidation of refractory sulphide

Four iron-sulphide-containing gold ores from the White Mountain mine in the Jilin Province, China were studied to examine the benefits of using oxidative treatment prior to conventional cyanidation to leach gold. This pre-treatment consisted of bubbling air into an ore/water mixture for eight hours while adding enough caustic sodium hydroxide to maintain a pH of 11 throughout the test. Three

US5851499A Method for pressure oxidizing gold-bearing

Provided is a method for treating refractory gold-bearing ores that have both sulfide material with which the gold is associated and from which the gold is difficult to separate and having organic carbonaceous material having an affinity for at least one of gold and a gold complex. The mineral material is pressure oxidized in the presence of a halogen-containing material in a manner to reduce

A FUNDAMENTAL STUDY OF THE ACIDIC PRESSURE

2.3 Pretreatment of Refractory Sulfidic Gold Ores 15 2.3.1 Pressure Oxidation 18 2.4 Acidic Pressure Oxidation of Iron and Arsenic Sulfide Minerals 29 References 38 CHAPTER 3 FUNDAMENTALS OF OXIDATION 45 3.1 Thermodynamics 45 3.2 Kinetic Considerations 59 3.2.1 Kinetic Model 64 References 72 CHAPTER 4 EXPERIMENTAL PROGRAM 75 4.1 Materials 75

An acidic pressure oxidation pre-treatment of refractory

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. The process resulted in substantially higher gold

An acidic pressure oxidation pre-treatment of refractory

An acidic pressure oxidation pre-treatment of refractory gold concentrates from the KweKwe roasting plant, Zimbabwe