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 ...

The oxidation step is conducted on ore concentrate slurry in an autoclave at 225°C and 3,800 kPa oxygen gas pressure with continuous feed. The slurry takes ca. 1 h to pass through the autoclave, during which time the sulphides are almost completely oxidised.

The key equipment of the pressure oxidation process is the autoclave, equipped with Outotec's mixing technology, to enable efficient use of oxygen. All main and auxiliary equipment, from the autoclave feed to flash tanks, is included in the autoclave train package.

Batch Autoclave Laboratory Procedures: The vessel used for the laboratory pressure oxidation process was a two-liter Parr titanium autoclave with dual impellers.It was heated and cooled externally and was pressurized with commercial-grade oxygen. A positive bleed of offgas was maintained in each test; the rate was measured in the offgas after the steam was removed with a condenser and …

Eaton Metal Products is the premier North American fabricator of pressure oxidation Autoclaves! With lift capacity at 550 tons, we handle these very large, extremely heavy vessels with ease. Our expertise with the specialty alloys, typically required in these vessels, has proven an invaluable asset to our extensive & ever expanding customer base.

The pressure oxidation process is used to prepare such ores for conventional gold extraction processes such as cyanidation. It is performed in an autoclave at high pressure and temperature, where high-purity oxygen mixes with a slurry of ore. When the original sulfide minerals are oxidized at high temperature and pressure, it completely ...

Pressure-oxidation in an autoclave at the Macraes gold mine, New Zealand, provides a useful analogue for natural acid–sulphate alteration of andesitic rocks associated with epithermal mineralisation processes. Sulphide oxidation in the autoclave, at 225°C, causes acidification of ore slurry to pH of <2, and these conditions are similar to ...

12%Pressure-oxidation in an autoclave at the Macraes gold mine, New Zealand, provides a useful analogue for natural acid–sulphate alteration of andesitic rocks associated with epithermal mineralisation processes. Sulphide oxidation in the autoclave, at 225°C, causes acidification of ore slurry to pH of <2, and these conditions are similar to ...

Types of Pressure Oxidation Autoclave Lining. Types of Pressure Oxidation Autoclave Lining. Post navigation. Previous. Next. As shown in Figure 1, there are other accessory vessels (splash and flash towers) in the autoclave circuits, that are also brickwork lined. The linings used to date, other than small test sections, have all been acid ...

Autoclave Pressure Oxidation (POx) Autoclave–POx Valve Number Valve Description Design Temperature Design Pressure Pipe Size Recommended Valve ° F ° C psi (g) bar inches dn PL-AU2 Watson Series Flex- Stream ® 1 Steam Isolation–Secondary1 530 277 1,500 103 1–2 25–50 • • 2 Steam Isolation–Primary1 530 277 1,500 103 1–2 25–50

Titanium Internals in Refractory Lined Pressure Oxidation Autoclaves Author: Franceschini, M Author: Ugarenko, C Hatch Ltd. - Autoclave Technology, Sr. Piping Engineer Hatch Ltd. - Autoclave Technology, Welding Technologist Co-Author: Gothard, S W.E. Smith Engineering Pry. Ltd., General Manager 4 Bending the 10 mm Titanium Gr. 2 to a 50 mm

3 Acidic Pressure Oxidation – Whole Ore, 4 Alkaline Pressure Oxidation – Whole Ore, 5 Acid and Alkaline Autoclave – Comparison, 6 Acidic Pressure Oxidation – Concentrate discuss the major features of these processes, with Section 5 providing a comparison of the acidic vs. alkaline options for whole-ore processing:

Partial oxidation has resulted in an autoclave plant that is able to achieve low operating unit costs. Process Description. The oxidation circuit consists of one autoclave, two stages of slurry heating, and two stages of flash cooling. The autoclave was designed to operate at 180°C (356°F) with a slurry residence time of 48 minutes.

Pressure oxidation has become a widely accepted technology for treating refractory gold ores. When sizing autoclaves for pressure oxidation, several major factors must be considered, including: feed rate, sulfur grade, residence time, temperature, pressure and pulp density. In determining the autoclave size, the total amount of sulfur contained in the feed is by far the most important factor ...

Every autoclave and preleach circuit is a custom design, based on the experience and expertise of the design team. With the right innovative and proprietary equipment designs, your pressure-oxidation needs can be effectively met. Our services are unique to your needs. We operate through the entire range of activities: feed-stock testing ...