pressure oxidation of nickel

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Standard electrode potential (data page) - Wikipedia

A partial pressure of 101.325 kPa (absolute) (1 atm, 1.01325 bar) for each gaseous reagent. This pressure is used because most literature data are still given for this value (1 atm) rather than for the current standard of 100 kPa (1 bar). An activity of unity for .

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Characterization of Residue from the Pressure Oxidation ...

A bulk sulfide flotation process followed by oxidation pressure leaching resulted in high extractions (>98 %) of the copper and nickel in the flotation concentrate. During the leaching, the iron in the flotation concentrate leaches and precipitates as either hematite (crystalline or amorphous) or as a basic iron sulfate (jarosite).

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Richard Weizenbach - Senior Consultant, High Pressure ...

Multiple assignments overseas to commission new hydrometallurgical plant involving licensed technology. Particular expertise in pressure hydrometallurgy plant design and development involving nickel, cobalt, PGM and gold as value metals.Commissioned the Lihir Gold project pressure oxidation .

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PLATSOLTM TREATMENT OF THE NORTHMET COPPER .

pressure oxidation (T ³200ºC) could dissolve copper and nickel. The fundamental difference between the PLATSOLTM process and conventional high temperature pressure oxidation is the addition of chloride ions to the autoclave feed. It was discovered that the addition of chloride at concentrations as low as ~3 g/L (5 g/L NaCl) resulted in

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PTI Nickel Matte GHS

Created: 04/09 PTI Nickel Matte Page 3 of 9 Wounds: Cleanse thoroughly to remove any particles. Fire Fighting Measures Suitable extinguishing media: Any, type to be selected according to materials stored in the immediate area. Special risks: Non-flammable. Keep containers cool with water spray.

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The HPAL Process :: Total Materia Article

High pressure acid leaching is becoming more and more important and the inevitable strain on natural resources continues. Its primary purpose is the assist in the recovery of nickel from lacerite ores but can also be used for other metals such as copper and cobalt.

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PLATSOLTM TREATMENT OF THE NORTHMET COPPER .

pressure oxidation (T ³200ºC) could dissolve copper and nickel. The fundamental difference between the PLATSOLTM process and conventional high temperature pressure oxidation is the addition of chloride ions to the autoclave feed. It was discovered that the addition of chloride at concentrations as low as ~3 g/L (5 g/L NaCl) resulted in

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Catastrophic Oxidation - NeoNickel

Any stainless or Nickel alloy containing Molybdenum is susceptible to catastrophic oxidation. Even an instance of the catastrophic oxidation of 316L (less than 3% Mo) has been encountered. Examples with Alloy X (9% Mo), Alloy 625 (9% Mo) and Super Duplex stainless ZERON® 100 .

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High-Pressure Leaching | Hazen Research

Examples of this include pressure oxidation (POX) of sulfide ores and concentrates, high-pressure acid leaching (HPAL) of nickel laterites, and wet-air oxidation of organics. Both batch and continuous reactors are available at Hazen for developing high-temperature processes. Hazen's engineers have assisted clients in developing POX processes for refractory gold ores, metals

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High Temperature Pressure Oxidation of a Low-Grade Nickel ...

High temperature pressure oxidation of a low-grade nickel concentrate was examined to demonstrate the potential benefits and shortcomings of this approach. The high iron sulfide content ensured that acid generation was much greater than for higher grade concentrates. This results in the formation of basic iron sulfate phases and a significant amount of sulfuric acid.

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Effect of Oxygen Partial Pressure on Oxidation of Iron at ...

The oxidation of iron was investigated by Rutherford backscattering spectroscopy at 573 K under the oxygen partial pressure from 10-1 to 105 Pa for 3-24 h. In the first stage of oxidation, thickness of the oxide film reached the maximum around 1 Pa. In the second stage the oxidation .

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PLATSOLTM TREATMENT OF THE NORTHMET COPPER .

pressure oxidation (T ³200ºC) could dissolve copper and nickel. The fundamental difference between the PLATSOLTM process and conventional high temperature pressure oxidation is the addition of chloride ions to the autoclave feed. It was discovered that the addition of chloride at concentrations as low as ~3 g/L (5 g/L NaCl) resulted in

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Oxygen Transport during the High Temperature Oxidation of ...

The high temperature oxidation of nickel has been investigated in air under atmospheric pressure in the temperature range 600–900°C. The oxidation kinetic curves deviate from the parabolic law for temperatures over 800°C. The observation of scale morphologies and the use of two stage oxidation experiments under 16O2/18O2 atmospheres showed that oxygen transport through the NiO scale had .

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Teck's CESL Nickel Process: Advancing Towards a Commercial ...

Figure 1: CESL Nickel Process Flowsheet for Disseminated Concentrates A process description of each unit operation is provided in the following section coupled with typical pilot plant metallurgical results. 4.3.1 Pressure Oxidation One of the key unit operations in the CESL Process is Pressure Oxidation (PO) in an autoclave,

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High Pressure Acid Leach - Caldera Engineering

In addition it reports on in-house experimental data from investigations related to the oxidation of high-purity Ni from 500 to 1300 °C in the oxygen pressure range 1×10−4–1 atm based on TG ...

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NASA Technical Reports Server (NTRS)

Sep 02, 2013· A study of oxidation kinetics of nickel metal in flowing air and oxygen-nitrogen mixtures Oxidation kinetics of nickel sheet in flowing air and gas mixtures. Document ID. 19650002476 . Document Type. Other (NASA Technical Note (TN)) Authors. Lewis, B. W. (NASA Langley Research Center Hampton, VA, United States)

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Selective Nickel Leaching from Nickel and Cobalt Mixed ...

nickel leaching from nickel sulfide by sulfuric acid, there has been a report on electrolytic oxidation of a nickel sulfide anode5); however, there have been no reports on control of the leaching parameters. 2. Samples and Experimental Procedure 2.1 Sulfide samples MS produced by Coral Bay Nickel Corporation6) was used

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Valves for autoclaves – pressure oxidation ( POX)

is usually used in the recovery of nickel and cobalt. Figure2 shows the typical temperature and pressure ranges for POX and HPAL. Pressure oxidation (POX) 10 35 Min Pressure (Bar) Max pressure (Bar) 150 225 Min temperature (°C) Max temperature (°C) High pressure acid leaching (HPAL) 35 65 Min Pressure (Bar) Max pressure (Bar) 200 275

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Kinetic studies on the leaching reactions in the autoclave ...

of pressure oxidation compared to conven-tional pressure oxidative leaching (POX), which operates at temperatures over 200°C and pressures of over 2 200 kPa (Angove et al., 1993; Corrans et al., 1995; Johnson et al., 1993). The main purpose of the leach circuit is to selectively dissolve (leach) nickel, copper, and cobalt from the finely ...

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XPS study of oxides formed on nickel‐base alloys in high ...

Sep 17, 2002· The aim of this work is to characterize the oxidation behaviour of different nickel‐base alloys exposed to high‐temperature and high‐pressure water for short oxidation times. The behaviour of Alloy 600 (74% Ni, 16% Cr, 9% Fe), Alloy 690 (60% Ni, 30% Cr, 9% Fe) and Alloy 800 (47% Fe, 32% Ni, 21% Cr) exposed to simulated, pressurised water ...

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Effect of Oxygen Pressure on Internal Oxidation of Nickel ...

The oxidation behavior of solid-solution nickel-aluminum alloys was studied at four levels of oxygen pressure ranging from a partial pressure of 10 −4 atmosphere to a total pressure of 10 atmospheres. Three such alloys containing 1.04, 3.90, and 6.40 atomic percent (a/o) Al were oxidized at 1000 C for times of 6.25, 25, and 100 hours.

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Thermodynamic modeling of pressure oxidation leaching of ...

TY - JOUR. T1 - Thermodynamic modeling of pressure oxidation leaching of copper-nickel converter matte. AU - Elfimova, L. G. AU - Ageev, N. G. AU - Naboychenko, S. S.

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The oxidation kinetics of thin nickel films between 250 ...

Undoped NiO. Nickel oxide (Ni 1− δ O) is a metal-deficient p-type semiconductor which is thermodynamically stable in a large temperature (T) and oxygen partial pressure (p O 2) range. 20 Nickel vacancies and electron holes (h˙) are predominant defects, but the ionization degree of nickel vacancies (singly ionized: or doubly ionized: using the Kröger–Vink notation 21) in the temperature ...

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High Pressure Acid Leach & Pressure Oxidation

Uranium Nickel Gold Copper Cobalt Rare earths Zinc 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.

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