Titanium Internals in Refractory Lined Pressure Oxidation ...

given autoclave's process volume increases, thereby processing more ore per unit time or the autoclave can be made smaller to reduce capital cost. In addition, hydraulically efficient baffling can be incorporated into titanium compartment walls where the optimum geometry is …

Read more

The Leachox™ Refractory Gold Process – The Testing, Design ...

The Leachox refractory gold process has to date been applied to the selectivetreatment of several refractory gold ores but on a relatively small scale. In this paper the successful implementation of the process, from initial testing through to commissioning at one of the world's largest refractory …

Read more

Increasing refractory gold production for Petropavlovsk ...

The mining of refractory ore is becoming increasingly common in Russia's numerous operational gold mines, with the process requiring additional pre-treatment prior to cyanidation for gold recovery. Enabling profitable processing of challenging ore. Close to 50% of Petropavlovsk's 21 Moz of resources and reserves are now classified as ...

Read more

Autoclave Technology - Hatch

Some ores require a high-temperature, high-pressure pretreatment process before leaching in order to improve metal recovery from the complex ore. Autoclaves are a preferred component of the process for many large-scale sulfidic refractory bodies, including such processes as Au-Ag pressure oxidation; Cu-Ag-Au pressure oxidation; Ni-Co pressure ...

Read more

Autoclave Circuit & Gold - Mineral Processing & Metallurgy

Process air is also injected into the acidulation tanks to aid in carbon dioxide removal. Carbonate levels are typically reduced to <2% in the acidulation tanks. As a rule of thumb, about 1% sulfide sulfur (S ) in the autoclave feed destroys 0.9% CO3 and typically the autoclave feed ranges from 2.0% to 2.5% S2-.

Read more

HYDROMETALLURGICAL TECHNOLOGY FOR GOLD RECOVERY …

of refractory gold-bearing pyrite-arsenopyrite concentrates by the high-temperature autoclave leaching method is shown in Fig. 2. The general flow-sheet of pyrite and arsenopyrite concentrates processing includes the following main process stages: grinding of float gold-bearing concentrate, decarbonization (acid treatment), i.e.,

Read more

MODELING OF HIGH PRESSURE PRETREATMENT PROCESS …

Keywords: pretreatment process, pressure oxidation, refractory gold ore and concentrate, leaching, modeling Investigation of high pressure pretreatment process for gold leaching is the objective of the present master's thesis. The gold ores and concentrates which cannot be easily treated by leaching process are called "refractory".

Read more

Application Note Refractory Gold Pretreatment - pH

Our third method for refractory ore pre-treatment involves oxidation within an autoclave at elevated temperatures and pressures. This is referred to as pressure oxidation (POX). Gold laden ore is pulverized to a similar consistency as found with bio-oxidation processes (~75μm). The slurry is pumped through thickeners to remove water prior to

Read more

Processing Options: Roaster/Autoclave - Gold Companies ...

As the name suggests, the crushed ore is heated to very high temperatures ( degrees C) and maybe done so under high pressure in an autoclave. The sulphides are converted to oxide products and the gold freed. The ore is then processed using CIP/CIL methods. Roasting is a high energy and high cost process and so only the most refractory ores with ...

Read more

Under Pressure and Feeling the Heat: Autoclave Technology ...

Under Pressure and Feeling the Heat: Autoclave Technology at the Heart of the Metal Extraction Process Published on May 14, 2019 May 14, 2019 • 165 Likes • 12 Comments

Read more

BACTERIAL LEACHING AS A PRE-TREATMENT STEP FOR GOLD ...

performance of autoclave process by oxidation of pyrrhotite (the presence of pyrrhotite results in deleterious elemental sulphur formation in the autoclave), but also to decompose siderite FeCO3, which forms CO2 and thus lowers the O2 partial pressure in the autoclave …

Read more

autoclaveing process for refractory ore

Crushing Plant in Mali View; Double-Refractory Carbonaceous Sulfidic Gold Ores -,The term "refractory ore" is used to, treat double-refractory carbonaceous sulfidic gold or, of ore available for the acid autoclave process, .ECONOMICS OF REFRACTORY GOLD ORE,ECONOMICS OF REFRACTORY GOLD ORE PROCESSES John E Litz and R Wayne Carter 119th TMS Annual Meeting February 18-22,,refractory ore ...

Read more

Process for treating refractory gold ores by roasting ...

Microscopic gold inclusions in sulfide minerals cannot typically be extracted by conventional cyanidation. The gold ore must be pretreated to oxidize sulfide minerals associated with gold and to remove other minerals and chemical compounds that interfere in the cyanidation leaching process. The recovery of gold from refractory sulfidic-carbonaceous ores after roasting pretreatment …

Read more

Establishing thE ProcEss MinEralogy of gold orEs

refractory carbonaceous sulfide ore is at Barrick's Goldstrike Mine where gold occurs in pyrite in refractory sulfide ore and double-refractory sulfidic/ carbonaceous ore. These ores are pretreated by autoclave and roaster prior to cyanide leaching (Thomas et al., 2000; Wickens et al., 2003). In the Jinya Carlin-type gold deposit in China, gold

Read more

PRESSURE LEACHING - RPMGlobal

The largest autoclaves in the world were started up by Barrick at the Pueblo Viejo Mine in he Dominican Republic in 2011 oxidizing 24,000 tons per day of refractory pyritic gold ores. Refractory sulfide gold autoclaves can be designed to process flotation concentrates or accept whole ore as feed based on sulfur grade and operating and

Read more

Autoclaveing Process For Refractory Ore

Autoclaveing Process For Refractory Ore. refractory gold ore. refractory gold ore crushing equipment. A refractory gold ore is gold-containing ore that is resistant to recovery by direct cyanidation and carbon adsorption processes. Application of diagnostic leaching technique for refractory …

Read more

Double-Refractory Carbonaceous Sulfidic Gold Ores ...

The mill/autoclave facility was dedicated to the processing of sulfidic single-refractory ore. Material with high preg-robbing characteristics was generally processed at the roaster facility described subsequently. In spring 2009, the scoping study for the implementation of a thiosulfate-based process at the mill/autoclave facility was initiated.

Read more

Autoclaveing Process For Refractory Ore

Autoclave mining. Autoclave mining. OPERATION OF THE AUTOCLAVES - VLIZ. 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 1 The pressure oxidation process .

Read more

cil gold autoclave

The autoclave process is designed for deposits where most gold is in sulfide minerals In an autoclave process, ore is treated at elevated pressures and temperatures in an oxygenrich environment to oxidize it for processing by another method Following the autoclave process and in oxide gold deposits that contain fine. More

Read more

Autoclaveing Process For Refractory Ore, Hot Products

First refractory ore processed at pox hubfirst refractory ore processed at pox hubDec 05 2018 one month ahead of schedule autoclave 1 has been successfully processing refractory ore concentrate as of 4 december 2018 320t was processed with gold, autoclaveing process for refractory ore

Read more

Process for the recovery of gold from refractory ores by ...

A process for recovering gold from a refractory ore slurry, said process comprising the steps of: introducing the slurry to at least one agitated autoclave maintained at an autoclave temperature in excess of about 150° C. and an autoclave oxygen partial pressure in excess of about 10 psia;

Read more

Autoclaveing Process For Refractory Ore

Autoclaveing Process For Refractory Ore. Gypsum Aggregates Grinding Machine Gravel Scale Gravel Crushing Machine And Grinding Mill. Usually construction recycling plants includes following machines vibrating feeder jaw crusher impact crusher vibrating screen or portable crushing plant Read More 07 May Gypsum Processing Plant Gypsum mining equipment is the mining equipment for gypsum …

Read more

Barrick Thiosulfate Leaching of Double Refractory Ore

refractory ore. Double refractory ore is comprised of sulfidic and carbonaceous materials. The use of thiosulfate solution combats the preg-robbing process caused by cyanide treatment on double refractory ores. The thiosulfate forms a complex with the gold that is …

Read more

Pressure Oxidation - Caldera Engineering

Pressure Oxidation (POX) is a process used to extract gold, copper, zinc, molybdenum, and uranium from refractory ore bodies. The POX process utilizes elevated temperatures (roughly 230 degrees Celsius), elevated pressures (roughly 35 bar or 510 psi), and oxygen to liberate the minerals from refractory ores. POX has been used since 1985 when it ...

Read more

autoclaveing process for refractory ore

autoclaveing process for refractory ore. autoclaveing process for refractory ore heavy industry is specialized in the design manufacture and supply of crushing equipment used in mining industry The product range of our company comprises mobile crushing plant jaw crusher cone crusher impact crusher milling equipment ball mill vibrating feeders screens and equipment for

Read more

US5071477A - Process for recovery of gold from refractory ...

The present invention is directed to an improvement in a process for the recovery of gold from refractory sulfidic auriferous ores which comprises oxidizing a slurry of ore with oxygen gas under pressure in the presence of sulfuric acid, neutralizing the oxidized slurry, cyanidizing the neutralized slurry to leach gold therefrom, and recovering gold from the resultant leachate.

Read more

Advances in high-temperature heap leaching of refractory ...

and refractory ores, as well as smaller deposits. As a result, the level of sophistication that needs to be built into the design and operation of the heap leaching process also increases. The heap leaching of copper ores is an example of such a trend, where heap leaching was initially applied only to the acid leaching of oxide ores.

Read more

autoclaveing process for refractory ore

Typical autoclave operating conditions for a refractory gold process are a . temperature of 190 to 230OC, and an oxygen over-pressure of 350 to 700 kPa (50 to 100 psi). The oxidation of sulphides are strongly exothermic reactions, and the pulp density of the feed to the autoclave is calculated based on the sulphide concentration in such a

Read more

Barrick Gold: Design of the leach Circuit

The single refractory ores, which are sulfide ores primarily are commonly handled by an autoclave circuit. This is due to the ease at which the autoclave can process the sulfide ore bodies. Generally speaking the term sulfide ore simply is a term used to lump a great

Read more

Basic Iron Sulphate in Pressure Oxidation Processing

Typical autoclave operating conditions for a refractory gold process are a . temperature of 190 to 230OC, and an oxygen over-pressure of 350 to 700 kPa (50 to 100 psi). The oxidation of sulphides are strongly exothermic reactions, and the pulp density of the feed to the autoclave is calculated based on the sulphide concentration in such a

Read more

Autoclaveing Process For Refractory Ore

The refractory ore treatment process is then followed by a conventional ... pressure autoclaves are used for the reactors.get price Mining gold turns to scientific world - Las Vegas Sun ... Mining gold turns to scientific world.

Read more

Method for the recovery of gold using autoclaving ...

This invention is a method for recovering gold from a refractory sulfidic gold-containing ore by oxidizing a slurry of the ore. Oxygenation occurs in an autoclave at between about 400° F. and about 500° F. with an oxygen overpressure of between about 50 psig and about 100 psig for at least 2 hours.

Read more

autoclaveing process for refractory ore

autoclaveing process for refractory ore. Alkaline and acidic autoclaving of refractory gold ores Know More. American Barrick operates two autoclaves for the processing of refractory gold ores. Because of the mineralogy of the ores, one autoclave is alkaline and t. US4738718A Know More. The process includes treating the ore in an autoclave at ...

Read more

autoclave pressure oxidation gold au

Autoclave pressure oxidation (POX) is an effective pre-treatment option when extracting gold from refractory ore bodies, such as pyrite and arsenopyrite. While gold processing plants are the most common utilizers of POX, the process can also be applied to …

Read more

Refractory Gold Technology

Sherritt had also provided extensive process development services to Homestake Mining Company, leading to the first commercial application of pressure oxidation for refractory gold ore treatment, at the McLaughlin Gold Complex in California, commissioned in 1985. Refractory Gold Technology

Read more