+86 15516432285

process flow for high pressure acid leaching

HIGH PRESSURE ACID LEACHING

methods of recovery, such as traditional leaching, have been outmoded. In the last decade, high pressure acid leaching (HPAL) in autoclaves has become the technologically preferred method for processing gold present in sulfide minerals. AL autoclaving entails subjecting the acidic ore to temperatures up to HP

More

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

More

HIGH PRESSURE SULPHURIC ACID LEACHING OF LATERITIC

In high pressure acid leaching processes, lateritic nickel ores are interacted with aqueous sulphuric acid solutions in acid resistant autoclaves at temperatures of 230- 270 °C and under pressures of 3.3-5.5 MPa for 60-180 minutes.

More

Autoclave DIAGRAM High Pressure Acid Leaching (HPAL) Page ...

High Pressure Acid Leaching (HPAL) Autoclave–HPAL Valve Number Valve Description Design Temperature Design Pressure Pipe Size Recommended Valve ° F ° C psi (g) bar inches dn PL-AU2 PL-NI PL-AV Watson Series Rotary Tech TM 1 HP Heater Vessel Drain 446 230 750 52 2–3 50–80 • 2 HP Heater Isolation 466 241 750 52 10–14 250–350 •

More

High pressure acid leaching of a refractory lateritic ...

Sep 01, 2011  By optimizing the basic HPAL process parameters: leaching at 255 °C with 0.30 sulfuric acid to ore weight ratio with a particle size of 100% −850 μ for 1 h of leaching, it was found that 87.3% of nickel and 88.8% of cobalt present in the ore could be extracted into the pregnant leach solution (PLS).

More

SGS MINERALS SERVICES – T3 SGS 004 05-2005 HIGH

HIGH-PRESSURE ACID LEACH PILOT-PLANT FACILITY HIGH-PRESSURE ACID LEACHING (HPAL) Major reserves of nickel are contained in laterite ores, which have traditionally been treated by pyrometallurgical methods. Hydrometallurgical treatment, by direct acid leaching of the ore at temperatures above 240°C, is however an alternative

More

HIGH PRESUURE LEACH PLANT PRESENTATION - W KAUZI

Mar 17, 2016  table of contents • 1 process description 3 • 1.1 introduction 3 • 1.2 process flow diagram 5 • 1.3 autoclave feed systems 6 • 1.3.1 concentrate surge tank 6 • 1.3.2 autoclave dilution surge tank6 • 1.4 autoclave leach circuit 7 • 1.5 area 220 – bfs leach circuit 8 • 1.6 area 230 – residue filtration 8 • 1.7 services 9 ...

More

Modelling of an autoclave used for high pressure sulphuric ...

Nov 01, 2013  Dorfling et al. (2012) proposed a set of chemical reactions to describe the leaching behaviour of the different base metal and OPM phases present in the first stage leach residue. A summary of the reactions that were found to accurately describe the leaching behaviour in a high pressure sulphuric acid leaching system is given in Table 1, together with corresponding reaction

More

Acid Pressure Leach Process for Copper Removal

Acid Pressure Leach Process for Copper Removal* Autoclave processing of low-grade molybdenite concentrates (1st Report) by Rinat MIRVALIEV1 and Katsutoshi INOUE2 The conditions for the selective oxidation of copper and iron sulfide minerals contained in a low-grade molybdenite concentrate during autoclave leaching in acidic media have been studied.

More

High pressure acid leaching of a refractory lateritic ...

Sep 01, 2011  By optimizing the basic HPAL process parameters: leaching at 255 °C with 0.30 sulfuric acid to ore weight ratio with a particle size of 100% −850 μ for 1 h of leaching, it was found that 87.3% of nickel and 88.8% of cobalt present in the ore could be extracted into the pregnant leach solution (PLS).

More

HIGH PRESUURE LEACH PLANT PRESENTATION - W KAUZI

Mar 17, 2016  table of contents • 1 process description 3 • 1.1 introduction 3 • 1.2 process flow diagram 5 • 1.3 autoclave feed systems 6 • 1.3.1 concentrate surge tank 6 • 1.3.2 autoclave dilution surge tank6 • 1.4 autoclave leach circuit 7 • 1.5 area 220 – bfs leach circuit 8 • 1.6 area 230 – residue filtration 8 • 1.7 services 9 ...

More

High pressure acid leaching: a newly introduced technology ...

Jan 02, 2020  In the last decade, nickel smelter is booming in Indonesia to process nickel saprolite to become Ferro Nickel, Nickel Pig Iron, Nickel Matte. This study is aimed to assess the potential implementation of High-Pressure Acid Leaching (HPAL). HPAL is a proven technology but not utilized in Indonesia due to the high investment, and it requires a ...

More

WEAR RESISTANT OPTIONS FOR HIGH PRESSURE ACID

Perth. CWS Intro\爀一漀渀 䘀攀爀爀漀甀猀屲Western Australia. 3. HIGH PRESSURE ACID LEACHING. • Started in 1998 • Cheap extraction of Laterite Ore 0.9% - 1.7% • 98% H2SO4, 240°C, 45 bar pressure. CALLIDUS WELDING SOLUTIONS PERTH, WESTERN AUSTRALIA. HPAL LOCATIONS.

More

Pressure leaching - BioMineWiki

The high pressure makes the method ideal for oxidative leaching of sulfides since the content of dissolved oxygen in the leaching solution is directly proportional to the pressure. Also in acid leaching of sulfides it can be chosen if the sulfide should be converted to elemental sulfur (S°) or sulfate (SO 4 2- ).

More

Leaching Laterites: Two New Processes Make Progress E MJ

PAL (or HPAL) Process – high-pressure sulphuric acid leach; and EPAL Process – enhanced pressure acid leach. Taylor sketched the history and pros and cons of each of these methods, noting that the Caron and PAL processes are not new, having been developed anywhere from five decades (PAL) to nine decades ago (Caron), and that they’ve had ...

More

Acid Pressure Leach Process for Copper Removal

Acid Pressure Leach Process for Copper Removal* Autoclave processing of low-grade molybdenite concentrates (1st Report) by Rinat MIRVALIEV1 and Katsutoshi INOUE2 The conditions for the selective oxidation of copper and iron sulfide minerals contained in a low-grade molybdenite concentrate during autoclave leaching in acidic media have been studied.

More

JP5418660B2 - Autoclave equipment in high pressure acid ...

Autoclave equipment in high pressure acid leaching process Download PDF Info Publication number JP5418660B2. ... leaching slurry transfer Prior art date 2012-06-19 Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status ...

More

Pressure Leaching of Copper Concentrates

Phelps Dodge Copper Pressure Leaching Developments Phelps Dodge ( Placer Dome) have developed a suite of proprietary processes, including: High temperature process (HT) Converts essentially all sulfide sulfur to acid Maximizes acid production Suitable for locations where dilute acid can be used beneficially Medium temperature process (MT)

More

Direct Nickel Process – Breakthrough Technology

• Existing High Pressure Acid Leach (HPAL) and ferronickel processes are struggling with CAPEX, OPEX, technical risk, delays and commercial failure • Indonesian Government want s downstream processing DNi offers a new proprietary processing solution that will position the Company among the lowest cash cost nickel producers in the next 5 years

More

EP2862951A1 - Autoclave apparatus used during high ...

In a high-pressure acid leaching process, mixing of material slurry and sulfuric acid is facilitated and a management value of a free sulfuric acid concentration after discharge is reduced. In an autoclave apparatus 100 used during a high-pressure acid leaching process which advances leaching by stirring heated and pressurized material slurry and sulfuric acid by stirrers 30A, 30B 30G ...

More

Control Valves for High Pressure Acid Leaching (HPAL) MASCOT

A common process found within the mineral industry particularly within Nickel extraction is High Pressure Acid Leaching (HPAL) which is used to separate the mineral from the ore. This process is highly efficient atore extraction but to achieve this extremely high pressures and temperatures are used and the fluid media is highly acidic.

More

PAPER OPEN ACCESS High pressure acid leaching: a newly ...

in Indonesia to process nickel saprolite to become Ferro Nickel, Nickel Pig Iron, Nickel Matte. This study is aimed to assess the potential implementation of High-Pressure Acid Leaching (HPAL). HPAL is a proven technology but not utilized in Indonesia due to the high investment, and it requires a large media for waste disposal.

More

Pressure Acid Leaching of Nickel Laterites: A Review

For example, the pressure leaching (PAL) process and high-pressure leaching (HPAL) processes are the preferred methods used to leach nickel and cobalt from limonite laterites, the merit of these ...

More

HIGH PRESUURE LEACH PLANT PRESENTATION - W KAUZI

Mar 17, 2016  table of contents • 1 process description 3 • 1.1 introduction 3 • 1.2 process flow diagram 5 • 1.3 autoclave feed systems 6 • 1.3.1 concentrate surge tank 6 • 1.3.2 autoclave dilution surge tank6 • 1.4 autoclave leach circuit 7 • 1.5 area 220 – bfs leach

More

WEAR RESISTANT OPTIONS FOR HIGH PRESSURE ACID

Perth. CWS Intro\爀一漀渀 䘀攀爀爀漀甀猀屲Western Australia. 3. HIGH PRESSURE ACID LEACHING. • Started in 1998 • Cheap extraction of Laterite Ore 0.9% - 1.7% • 98% H2SO4, 240°C, 45 bar pressure. CALLIDUS WELDING SOLUTIONS PERTH, WESTERN AUSTRALIA. HPAL LOCATIONS.

More

PAPER OPEN ACCESS High pressure acid leaching: a newly ...

in Indonesia to process nickel saprolite to become Ferro Nickel, Nickel Pig Iron, Nickel Matte. This study is aimed to assess the potential implementation of High-Pressure Acid Leaching (HPAL). HPAL is a proven technology but not utilized in Indonesia due to the high investment, and it requires a large media for waste disposal.

More

Acid Pressure Leach Process for Copper Removal

Acid Pressure Leach Process for Copper Removal* Autoclave processing of low-grade molybdenite concentrates (1st Report) by Rinat MIRVALIEV1 and Katsutoshi INOUE2 The conditions for the selective oxidation of copper and iron sulfide minerals contained in a low-grade molybdenite concentrate during autoclave leaching in acidic media have been studied.

More

Control Valves for High Pressure Acid Leaching (HPAL) MASCOT

A common process found within the mineral industry particularly within Nickel extraction is High Pressure Acid Leaching (HPAL) which is used to separate the mineral from the ore. This process is highly efficient atore extraction but to achieve this extremely high pressures and temperatures are used and the fluid media is highly acidic.

More

JP5418660B2 - Autoclave equipment in high pressure acid ...

Autoclave equipment in high pressure acid leaching process Download PDF Info Publication number JP5418660B2. ... leaching slurry transfer Prior art date 2012-06-19 Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status ...

More

EP2862951A1 - Autoclave apparatus used during high ...

In a high-pressure acid leaching process, mixing of material slurry and sulfuric acid is facilitated and a management value of a free sulfuric acid concentration after discharge is reduced. In an autoclave apparatus 100 used during a high-pressure acid leaching process which advances leaching by stirring heated and pressurized material slurry and sulfuric acid by stirrers 30A, 30B 30G ...

More

Acid Pressure Leaching of Nickeliferous Laterite Ore

Table of ContentsAutoclaving of Laterite Ores High in Magnesium SilicatesCharacterization of the Magnesium Sulfate ScaleMagnesium Sulfate Solubility RelationshipsEffect of Magnesium Sulfate Deposition on Alunite and Hematite Scale Formation The AMAX sulfuric acid leaching process involves countercurrent digestion of nickeliferous laterite ore at high pressure and at atmospheric conditions ...

More

Pressure Acid Leaching of Nickel Laterites: A Review

For example, the pressure leaching (PAL) process and high-pressure leaching (HPAL) processes are the preferred methods used to leach nickel and cobalt from limonite laterites, the merit of these ...

More

acid leaching process silica fabric

In this article, a leaching study, carried out on a quartz sample to obtain high-purity silica sands, has been presented A leaching process by using oxalic acid to remove low iron content from the ore under study and to obtain a material suitable for fiber optic production has been evaluated A characterization study has been carried out to ...

More

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 liberate the minerals from refractory ores. POX has been used since 1985 when it ...

More

(PDF) Pressure Acid Leaching of Australian Nickel-Cobalt ...

Abstract. The pper examines the pressure acid leaching processes characteristics of three West Australian nickel-cobalt laterite projects, Murrin Murrin, Cawse and Bulong, and compares them with ...

More

Pressure Acid Leaching of Nickel Laterites: A Review ...

Abstract. A review of the literature over the past 30 years on the processing of nickel laterites by high temperature acid leaching has been carried out to provide a better understanding of the mineralogy, leaching process chemistry and effect of operating conditions

More

Research on Sulfur Conversion Behavior in Oxygen Pressure ...

Mar 11, 2018  Abstract. As an important treatment method of processing the sphalerite, the technology of pressure acid leaching has many benefits, such as process flow short, no waste pollution, low production costs, high leaching rate of Zn, and S output in

More