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May 18, 2006· 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 ...
Sulfide Pressure Oxidation Pressure leaching of sulfide ores is complicated by many items such as sulfur viscosity and the passivation of reactive surfaces. "Low" temperature conditions (100o C to 140o C) are generally not used in sulfide pressure leaching as this temperature range is conducive to formation of liquid elemental sulfur.
Nevertheless, the pressure oxidation of double refractory materials containing carbonaceous matter in addition to sulfides results in substantial gold losses due to autoclave preg-robbing.
The process chemistry during the oxidation of molybdenite concentrates in an oxygen pressure leach can be controlled by regulating the amount of ferric iron and excess sulfuric acid recycled as autoclave discharge slurry or filtrate to the autoclave feed.
FI126061B - Autoclave for pressure oxidation - Google Patents Autoclave for pressure oxidation Download PDF Info ... autoclave tin tin layer Prior art date 2013-12-13 Application number FI20136261A Other languages Finnish (fi) Swedish (sv) Other versions FI20136261A (en Inventor
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.
The process chemistry during the oxidation of molybdenite concentrates in an oxygen pressure leach can be controlled by regulating the amount of ferric iron and excess sulfuric acid recycled as autoclave discharge slurry or filtrate to the autoclave feed. A computer model capable of predicting the concentration of soluble molybdenum in the autoclave discharge and based on the concentrate and ...
STABILIZATION OF SUPERSONIC VENT GAS FROM AUTOCLAVE PRESSURE OXIDATION 83 Figure 6. Velocity distribution and flow field inside the blast shroud with a perforated plate Figure 5. Pressure and velocity variation through the blast shroud (a) without the perforated plate, and (b) with the perforated plate 79-92_Franceschini:text 2/14/09 11:33 AM ...
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.
• Run the autoclave at a chamber temperature of 121°C for 60 minutes *, using a dry cycle run. * 121°C is a standard temperature for autoclave operation, and generally achieved when chamber pressure is 15-16 psi. However, this pressure is dependent upon altitude. At higher altitudes, the pressure must be increased to achieve 121°C. It is ...
autoclaves at temperatures of 200 to 220°C and a pressure of about 3000 kPa (Schlesinger et al., 2011). An oxidizing agent, usually oxygen, is required to oxidize sulphide ions to sulphate ions. The oxidation of sulphur to sulphate is exothermic; consequently, a method of heat removal is necessary in order to maintain the temperature in the ...
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 technology, the process can also be …
Simultaneous pressure oxidation and leaching experiments were conducted at a temperature range of 40–80 °C, oxygen pressure of 87.5–200 psi, and cyanide concentration of 0.8–1.2 wt% in a 2 ...
This technique uses autoclave leaching with pure air/oxygen, high pressure, and temperature for the treatment of refractory carbonaceous ore treatment (Sibrell, 1991; Schmitz et al., 2001b). Pressure oxidation is used to treat highly refractory sulfide ores containing chalcopyrite, pyrite, pyrrhotite, and/or arsenopyrite to release gold for ...
Metallurgy & Materials Society | MetSoc of CIM
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
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 …
High Pressure Acid Leach (HPAL) is a process used to extract nickel and cobalt from laterite ore bodies. The HPAL process utilizes elevated temperatures (roughly 255 degrees Celsius), elevated pressures (roughly 50 bar or 725 psi), and sulfuric acid to separate nickel and cobalt from the laterite ore. HPAL has been used since 1961 when it was ...
the five-compartment autoclave operating at temperatures of 105°C to 110°C and 1100 kPa pressure, the extraction of Ni, Cu, and Co ions into solution is achieved through the oxidation of the sulphide concentrate using approximately 50 kg H2SO4 per ton, 10 kg NaCl per ton, and 1.21 kg O2 per kilogram of S2-. The autoclave reactions
Jan 01, 2005· 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:
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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
oxidation reaction would generate sufficient heat for the oxidation reaction to proceed to completion. Non-acidic pressure oxidation techniques such as alkaline pressure oxidation use similar conditions of temperature, pressure and oxygen to acidic route but the process is …
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.
Jan 31, 2018· 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 of pyrite-arsenopyrite refractory gold concentrate 103 Autoclave oxidation tests were conducted in Büchi ecoclave model 075 titanium autoclave. The total volume of the autoclave vessel was about 1.1 dm3 and it was equipped with magnetic agitation unit, gas inlet and outlet, and sampling system with
Pressure Oxidation Autoclave Autoclave Supply. Mar 11 2017 Pressure oxidation POX autoclave leaching is an effective method to recover refractory gold POX is a demanding AL etallurg High Pressure Acid Leach and Pressure Oxidation RIGHT SOLUTIONS RIGHT …
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