high pressure oxidation refractory

High Pressure Oxidation Refractory

Pressure oxidation - Wikipedia

Pressure oxidation. Refractory ores require pre-treatment before the gold can be adequately extracted. 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.

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 …

Pressure Oxidation Process - Outotec

Outotec® Pressure Oxidation Process Get a comprehensive solution for refractory gold sulfide oxidation from one reliable supplier. The Outotec pressure oxidation process solution offers a sustainable and economical process in a complete pressure oxidation plant with a high level of automation and process control.

high pressure oxidation of refractory gold minerals

High-pressure oxidation of refractory gold ores and concentrates is performed in order to enhance their amenability to cyanide leaching. Oxidation conditions are critical to the chemistry within the autoclave and can significantly affect 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.

high pressure oxidation of refractory gold minerals

high pressure oxidation of refractory gold minerals. Gold processing | Britannica . 2018-7-14 · Gold processing, preparation of the ore for use in various products. Native gold is the most common mineral of gold, accounting for about 80 percent of the metal in the Earths crust. It occasionally is found as nuggets as large as 12 millimetres (0 ...

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

Refractory Gold Processes - Mineral Processing & Metallurgy

Refractory Gold Processes. Your gold concentrate will afterwards undergo ultrafine grind and go for the cheapest oxidation there is ie: Atmospheric or Low Pressure Oxidation before going to classic CIL. This last more costly option is commonly known as POX or High Pressure Oxidation for the most difficult refractory gold ores.

Basic Iron Sulphate in Pressure Oxidation Processing

ions. This results in very high cyanide consumption as well as other operating and environmental problems associated with high levels of thiocyanate. 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

Gold extraction - Wikipedia

Pressure oxidation; Albion process; The refractory ore treatment processes may be preceded by concentration (usually sulfide flotation). Roasting is used to oxidize both the sulfur and organic carbon at high temperatures using air and/or oxygen. Bio-oxidation involves the use of bacteria that promote oxidation reactions in an aqueous environment.

Autoclave Technology - Hatch

Oct 30, 2019 · Challenges. 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;

Pressure oxidation of double refractory gold concentrates

The pilot tests results of double refractory concentrates pressure oxidation were introduced. The pressure oxidation approach that allows obtaining high gold recovery from double refractory ...

Oxidation of refractory metals in air and low pressure ...

1. Introduction. The oxidation behavior of refractory metals has been the subject of numerous past studies and reviews , , , , , , , , , , .In air at pressures near 2100 Pa (1 atm), scale formation occurs resulting in negligible oxidation rates below 200°C and slow parabolic rates at 300–400°C.

Thermochemistry and the Oxidation of Refractory Metals at ...

Jan 01, 1970 · Abstract. Recent developments in the thermochemical data for the condensed oxide phases and volatile oxide species for the refractory metals has made possible an analysis of the several types of high temperature oxidation processes.

Sherritt International - Operations - Technologies ...

Pressure oxidation of refractory gold ores and concentrates. Faster reaction kinetics and smaller process equipment than bio-oxidation; and High gold recoveries (>95%) possible over a wide range of feed composition (1.5 to 40 wt% S, 0.1 to 20 wt% As) and sulphide mineralogy.

Recovery Refractory Resources - SGS

than pressure oxidation. While there isn’t one set procedure for refractory gold ore processing, SGS looks at every situation separately, to evaluate which option is the best fit.” ROASTING Roasting is generally applied to sulphide minerals and refractory ores. It involves a thermal gas-solid reaction during which

Redox potential measurement during pressure oxidation (POX ...

Pressure oxidation (POX) leaching has been commercially applied to refractory gold ores since the 1980s. In the process, sulphide material is oxidized and dissolved in order to release the gold ...

High Pressure O Idation Of Refractory Gold Minerals

High Pressure O Idation Of Refractory Gold Minerals We are a large-scale manufacturer specializing in producing various mining machines including different types of sand and gravel equipment, milling equipment, mineral processing equipment and building materials equipment.

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