high pressure oxidation refractory

PRESSURE OXIDATION OF REFRACTORY GOLD ORES:

2014-10-1 · 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 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. A brief review of the literature on pressure oxidation of refractory gold materials is presented. The chemistry of the aqueous ...

(PDF) Pressure oxidation of double refractory gold ...

The pressure oxidation approach that allows obtaining high gold recovery from double refractory materials was proposed. $/7$ : The chemical compositions of the concentrates

Pressure Oxidation of a Refractory Sulfide Concentrate and ...

2018-8-11 · Pressure oxidation of the refractory sulfide/carbonaceous ores has gained world-wide acceptance. Compared with roasting, pressure oxidation yields higher gold extractions

Pressure oxidation overview - ScienceDirect

2005-1-1 · The utilization of a pressure-oxidation circuit to treat refractory gold ores or concentrates is a complex decision, taking into consideration capital costs, operating costs, gold recovery, and environmental impacts. The payback and internal rate of return (IRR) has to be evaluated in the decision for selecting the process.

High Pressure Acid Leach & Pressure Oxidation

2016-12-20 · 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 OF PYRITE-ARSENOPYRITE

2012-10-4 · arsenopyrite gold concentrate. Batch oxidation tests in an autoclave were done using a factorial design. Different responses were measured and analysed to study effect of the three factors and oxidation kinet-ics. Generally, high slurry density required high temperature

Surface oxidation mechanism of a refractory high-entropy ...

2019-5-9 · The oxidation process on the (001) surface of the refractory [(Mo 1−z W z) 0.85 Ta 0.10 (TiZr) 0.05 (z = 0.5)] HEA alloy is examined. The SQS method is used to generate random solid solution ...

Titanium Internals in Refractory Lined Pressure Oxidation ...

2018-4-14 · 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

high pressure oxidation of refractory gold minerals

high pressure oxidation of refractory gold minerals Superalloy Wikipedia A superalloy, or highperformance alloy, is an alloy that exhibits several key characteristics: excellent mechanical strength, resistance to thermal creep deformation, good surface stability, and resistance to corrosion or oxidation.

Pressure Oxidation of a Refractory Sulfide Concentrate and ...

2018-8-11 · Pressure oxidation of the refractory sulfide/carbonaceous ores has gained world-wide acceptance. Compared with roasting, pressure oxidation yields higher gold extractions from ores or concentrates and enables better handling of environmentally sensitive

Pressure oxidation overview - ScienceDirect

2005-1-1 · The utilization of a pressure-oxidation circuit to treat refractory gold ores or concentrates is a complex decision, taking into consideration capital costs, operating costs, gold recovery, and environmental impacts. The payback and internal rate of return (IRR) has to be evaluated in the decision for selecting the process.

PRESSURE OXIDATION OF PYRITE-ARSENOPYRITE

2012-10-4 · arsenopyrite gold concentrate. Batch oxidation tests in an autoclave were done using a factorial design. Different responses were measured and analysed to study effect of the three factors and oxidation kinet-ics. Generally, high slurry density required high temperature

Titanium Internals in Refractory Lined Pressure Oxidation ...

2018-4-14 · 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

Pressure oxidation of double refractory raw materials in ...

Pressure oxidation allows to carry out the efficient processing of goldbearing sulfide materials. However, application of this method for processing of double refractory raw materials leads to irreversible gold losses due to autoclave preg-robbing of gold by organic carbon. Thermodynamic and experimental data indicate that almost complete sulfide decomposition leads to a high value of ...

An oxidation resistant refractory high entropy alloy ...

2019-5-13 · Although refractory high entropy alloys (RHEAs) have shown potentials to be developed as structural materials for elevated temperature applications, most of the reported oxidation behaviours of ...

Developments in the pretreatment of refractory gold ...

2009-11-20 · process is the same as in the high-pressure process and occurs as described by Equations [1–4]. The regeneration of NOx is finished under atmospheric pressure, or at high pressure in the two options, so, the rate of reuse of HNO 3 is different. The atmospheric pressure nitric acid oxidation process is shown in

Recovery Refractory Resources - SGS

options for refractory gold ores: roasting; pressure oxidation; bio-oxidation; and ultra-fine grinding. In roasting, pressure oxidation and bio-oxidation, the iron sulphide minerals are oxidised to create sulphur dioxide (SO 2) gas in the case of roasting, or sulphate ions in pressure oxidation and bio-oxidation. The iron component is

A FUNDAMENTAL STUDY OF THE ACIDIC PRESSURE

2020-8-11 · developed to represent the pressure oxidation of pyrite in the system studied at high temperature, based on the batch experimental data, which can be used to further develop a mathematical model to simulate continuous autoclave oxidation. During the acidic pressure oxidation of mixtures of pyrite and orpiment, As(III)

high pressure oxidation of refractory gold minerals

high pressure oxidation of refractory gold minerals Superalloy Wikipedia A superalloy, or highperformance alloy, is an alloy that exhibits several key characteristics: excellent mechanical strength, resistance to thermal creep deformation, good surface stability, and resistance to corrosion or oxidation.

High pressure oxidation of precursor alloys - American ...

"High-Pressure Oxidation of Refractory Metals--Experimental Methods and Interpretation" W. M. Fassel, Jr. et al., 2 Metalkde, 64(4) 286-295 (1973) no month. "The Internal Oxidation of Silver Alloys at High Pressures and in Atomic Oxygen" D. Stockel et al. AFSC Oxidation of Tungsten

Pressure oxidation of double refractory raw materials in ...

Pressure oxidation allows to carry out the efficient processing of goldbearing sulfide materials. However, application of this method for processing of double refractory raw materials leads to irreversible gold losses due to autoclave preg-robbing of gold by organic carbon. Thermodynamic and experimental data indicate that almost complete sulfide decomposition leads to a high value of ...

An oxidation resistant refractory high entropy alloy ...

2019-5-13 · Although refractory high entropy alloys (RHEAs) have shown potentials to be developed as structural materials for elevated temperature applications, most of the reported oxidation behaviours of ...

Developments in the pretreatment of refractory gold ...

2009-11-20 · process is the same as in the high-pressure process and occurs as described by Equations [1–4]. The regeneration of NOx is finished under atmospheric pressure, or at high pressure in the two options, so, the rate of reuse of HNO 3 is different. The atmospheric pressure nitric acid oxidation process is shown in

A FUNDAMENTAL STUDY OF THE ACIDIC PRESSURE

2020-8-11 · developed to represent the pressure oxidation of pyrite in the system studied at high temperature, based on the batch experimental data, which can be used to further develop a mathematical model to simulate continuous autoclave oxidation. During the acidic pressure oxidation of mixtures of pyrite and orpiment, As(III)

Recovery Refractory Resources - SGS

options for refractory gold ores: roasting; pressure oxidation; bio-oxidation; and ultra-fine grinding. In roasting, pressure oxidation and bio-oxidation, the iron sulphide minerals are oxidised to create sulphur dioxide (SO 2) gas in the case of roasting, or sulphate ions in pressure oxidation and bio-oxidation. The iron component is

TECHNOLOGY FOR PROCESSING OF REFRACTORY GOLD

2017-12-20 · processes. In our opinion sulphide atmospheric oxidation processes are the most interesting as oxidation there runs without high temperature (up to 100 оС) and excess pressure (open units), and with acid environment close to neutral. The process of sulphide concentrates treatment named “Albion” (Albion

REFRACTORY METALS - ASM International

(5070oF) in high vacuum or protective, reducing atmosphere. At these high temperatures, insulation of the hot zone is a problem and it is normal to use tungsten in high vacuum or a low partial pressure of hydrogen. • Heating elements. Hot zones usu-ally consist of a refractory metal ele-ment (single, two, or three phase) con-

A Comparison of Refractory Lined Carbon Steel and

2018-4-14 · Pressure kPa(g) Typical Uses High Pressure Acid Leach 250 – 275 4500 – 6300 Ni Laterite ore leaching Bayer™ Alumina Process 260 – 280 7000 - 8000 High temperature caustic digestion Total Sulphide Oxidation 200 – 235 2000 – 3500 Refractory gold sulphide ore treatment Acid Pressure Leaching 180 1730

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