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  • High pressure acid leaching: a newly introduced

    Author: T Gultom, A Sianipar
  • (PDF) Kinetics of high pressure leaching of nickel ...

    from the high-magnesium or saprolite fraction of such ores processing the limonite fraction of the ore by high pressure and temperature leaching. The low magnesium

  • PAPER OPEN ACCESS High pressure acid leaching: a

    processed high-grade nickel saprolite to produce ferronickel by smelter rotary kiln electric furnace. Today, PTHPL plan to process nickel ore limonitic to produce nickel sulfate and cobalt sulfate through nickel ore leaching by hydrometallurgy high-pressure acid leach technology. Limonitic ore consists of nickel oxide and cobalt oxide.

  • (PDF) Tracer vs. Pressure Wave Velocities through ...

    Tracer vs. Pressure Wave Velocities through Unsaturated Saprolite Article (PDF Available) in Soil Science Society of America Journal 64(1):75-85 January 2000 with 123 Reads How we measure 'reads'

  • Atmospheric leach process for the recovery of nickel

    2001-7-17  U.S. Pat. No. 3,991,159 teaches the use of saprolite ore to neutralize acid resulting from the high-pressure acid leach of limonite ore. Leaching of the saprolite fraction is carried out at high temperature (1500°-250° C.) and pressure for effective iron and aluminum rejection, but with relatively low nickel extraction from the saprolite ore.

  • The use of oxygen in high pressure acid leaching of nickel ...

    2013-1-7  High pressure acid leaching (HPAL), on the other hand, ?ts in well with a ?ne, moist feed and it is considered to the best option in many cases for selective dissolution of nickel and cobalt, as the iron is re-precipitated as hematite.

  • Selective leaching of nickel from prereduced limonitic ...

    2016-10-31  High pressure acid leaching (HPAL) is the primary method for extraction of nickel from limonitic laterite. The severe operating conditions, the complexity of facilities, and several technical problems, such as scale formation, have always accompanied the HPAL, however.

  • Processing of Nickel Laterite Ores on the Rise

    The Move to Nickel LateritesLateritic Nickel Ore ProcessingConclusionSulfides have long supplied the bulk of the global appetite for nickel. But dwindling resources combined with the need to mine at greater (and subsequently less economic) depths to obtain sulfide ores has many miners looking at nickel laterites. Additionally, nickel is expected to see growth in demand as developing economies spur a greater need for stainless steel. Similarly, demand is expected to grow as a result of nickel’s use in lithium-ion batteries; nickel is used in the cathodes of lit...
  • limonite troughs and saprolite highs - Scalepaint

    A high purity nickel metal can be produced by this method, and nickel recoveries are typically in the range of 90% to 92% [8]. While several of these processes have been implemented, limonite/saprolite blended feeds. Because of the low recoveries and high operating costs, the C process is generally considered to be uneconomic [1,10 . Read more

  • The effects of weathering on the physical and mechanical ...

    cell pressure of 5MPa could be reached in a high-pressure system. Saturation was ensured by flushing the specimens with carbon dioxide and subsequently distilled de-aired water, which resulted in B values larger than 099. All the cells were equipped with linear variable differential transdu-cers (LVDTs) for the local measurement of axial and ...

  • The effects of weathering on the physical and mechanical ...

    cell pressure of 5MPa could be reached in a high-pressure system. Saturation was ensured by flushing the specimens with carbon dioxide and subsequently distilled de-aired water, which resulted in B values larger than 099. All the cells were equipped with linear variable differential transdu-cers (LVDTs) for the local measurement of axial and ...

  • Atmospheric acid leaching of nickel laterites review:

    The kinetics and mechanism of leaching of the key minerals are reviewed together with methods for enhancing nickel recovery. Existing and developing AL processes for extracting nickel and cobalt from these ores are then considered with comparison to high pressure acid leaching (HPAL) technology.

  • Papangelakis, Vladimiros G. - University of Toronto ...

    Azimi, V.G. Papangelakis, “Solubility of gypsum and anhydrite in simulated laterite pressure acid leach solutions up to 250°C,” Hydrometallurgy, 102, 1–13, 2010 Z. Jankovic, V.G. Papangelakis, “Measurement of pH in high-temperature nickel laterite pressure

  • saprolite iron ore processing - sabahsharkprotection.org

    ore mining limonite_Limonite Limonite is an iron ore consisting ... Processing Limonite Iron Ore ... ores which 1,895,315 tons of saprolite ore to ... Inquire Now; Patent US20100282024 Limonite and Saprolite Heap . The power requirements and high iron to nickel ore ratio for ... It also includes processing limonite and saprolite blends ...

  • Iron Control in Atmospheric Acid Laterite Leaching

    2019-7-3  At the moment, high-pressure acid leaching (HPAL) and pyrometallurgical treatment are the two main technologies for nickel laterite processing [11,12]. However, they have some disadvantages, such as high autoclave investment costs [6,13], technical problems [14], and high

  • limonite troughs and saprolite highs - Scalepaint

    A high purity nickel metal can be produced by this method, and nickel recoveries are typically in the range of 90% to 92% [8]. While several of these processes have been implemented, limonite/saprolite blended feeds. Because of the low recoveries and high operating costs, the C process is generally considered to be uneconomic [1,10 . Read more

  • limonite saprolite - ferienwohnung-zur-reede.de

    Interpretation of Induced polarization data to estimate saprolite and limonite deposits carried out. The case studies at Kolo Bawah, Morowali Central of Sulawesi. The 20 lines data aqiuisition with 200m length. Topography at the area is range of hill with medium to high slopes.

  • Leaching Laterites: Two New Processes Make Progress

    2020-4-8  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 ...

  • 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 ... 100% saprolite, 25% limonite/75% saprolite, and 50% limonite/50% saprolite – and a 50% lim onite/50% saprolite ore blend from Brazil ...

  • 地质专业常用术语中英文对照词典_百度文库

    2018-6-25  garnierite 镍叶蛇纹石 millerite 针镍矿 talc 滑石 chlorite 绿泥石 montmorillonite 蒙脱石 saprolite 腐泥土 clay mineral ... 机 flotation 浮选 tailler dam 尾矿坝 Refinery 精炼厂 Pyrometallurgic 火法冶炼的 Heap leaching 堆浸 high pressure acid leach 高压 ...

  • Iron Control in Atmospheric Acid Laterite Leaching

    2019-7-3  At the moment, high-pressure acid leaching (HPAL) and pyrometallurgical treatment are the two main technologies for nickel laterite processing [11,12]. However, they have some disadvantages, such as high autoclave investment costs [6,13], technical problems [14], and high

  • saprolite iron ore processing - sabahsharkprotection.org

    ore mining limonite_Limonite Limonite is an iron ore consisting ... Processing Limonite Iron Ore ... ores which 1,895,315 tons of saprolite ore to ... Inquire Now; Patent US20100282024 Limonite and Saprolite Heap . The power requirements and high iron to nickel ore ratio for ... It also includes processing limonite and saprolite blends ...

  • 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 ... 100% saprolite, 25% limonite/75% saprolite, and 50% limonite/50% saprolite – and a 50% lim onite/50% saprolite ore blend from Brazil ...

  • For personal use only - Australian Securities Exchange

    2011-3-29  properties, high pressure acid leaching (HPAL) of limonite and transition ores, atmospheric leaching (AL) of saprolite ores, saprolite neutralisation (SN) and leach slurry (CCD) settling properties. Ore slurry settling tests demonstrated that HPAL feed ore could be thickened to 40% solids and saprolite

  • limonite troughs and saprolite highs - Scalepaint

    A high purity nickel metal can be produced by this method, and nickel recoveries are typically in the range of 90% to 92% [8]. While several of these processes have been implemented, limonite/saprolite blended feeds. Because of the low recoveries and high operating costs, the C process is generally considered to be uneconomic [1,10 . Read more

  • Processing of Nickel Laterite Ores on the Rise

    Limonite, which accounts for nearly double the amount of saprolite available globally, ... Leaching typically occurs via either high pressure acid leach (HPAL) or heap leaching, with HPAL operations seeing mixed success as a result of both technical and economic difficulties. Here, we’ll focus on the heap leaching approach.

  • limonite saprolite - ferienwohnung-zur-reede.de

    Interpretation of Induced polarization data to estimate saprolite and limonite deposits carried out. The case studies at Kolo Bawah, Morowali Central of Sulawesi. The 20 lines data aqiuisition with 200m length. Topography at the area is range of hill with medium to high slopes.

  • Direct-Push (DPT) High-Pressure Jet Injection for

    High Pressure Jetting in Saprolite Path of jet cutting across weathered rock 8. High Pressure Jet Injection Mechanisms 150 to 400+ psi slurry injection which creates hydraulic fractures 9. High Pressure Jet Injection Mechanisms Slurry contains proppant (sand, ZVI, etc) which holds fracture open and either enhances permeability, reacts with ...

  • Chromium removal from leach liquors produced

    A method is provided for the removal of chromium from leach liquors produced during high pressure leaching of laterite ores in an autoclave, by addition to the autoclave of carbon in a quantity of about 0.5%-1% by weight with reference to the total dry feed.

  • Saprolite slope design at the Rosebel Gold Mine

    2019-12-21  Grab samples in the transition zone were also low plasticity and often had a high sand content. Shelby tube saprolite samples were obtained from several pits at shallow depths for consolidation and triaxial testing. Multi-stage consolidated-undrained triaxial testing was undertaken with measurements of pore pressure to estimate

  • saprolite iron ore processing - sabahsharkprotection.org

    ore mining limonite_Limonite Limonite is an iron ore consisting ... Processing Limonite Iron Ore ... ores which 1,895,315 tons of saprolite ore to ... Inquire Now; Patent US20100282024 Limonite and Saprolite Heap . The power requirements and high iron to nickel ore ratio for ... It also includes processing limonite and saprolite blends ...

  • Saprolite slope design at the Rosebel Gold Mine

    2019-12-21  Grab samples in the transition zone were also low plasticity and often had a high sand content. Shelby tube saprolite samples were obtained from several pits at shallow depths for consolidation and triaxial testing. Multi-stage consolidated-undrained triaxial testing was undertaken with measurements of pore pressure to estimate

  • Saprolite Slope Design - SRK Consulting

    2020-6-8  Saprolite Slope Design at the Rosebel Gold MineTechnical Paper presented at Slope ... during 2013 through 2014 to provide slope design configurations which could be practically implemented in this high rainfall tropical environment using the capabilities of the equipment on site. ... This is due to elevated pore pressure in the toe of the ...

  • Processing of Nickel Laterite Ores on the Rise

    Limonite, which accounts for nearly double the amount of saprolite available globally, ... Leaching typically occurs via either high pressure acid leach (HPAL) or heap leaching, with HPAL operations seeing mixed success as a result of both technical and economic difficulties. Here, we’ll focus on the heap leaching approach.

  • Nickel Laterite's Integral Role in the Coming Nickel

    2018-9-13  The main advantage of the smelting process is that it is a proven technology and can process saprolite ores (high magnesium), in relative terms, quickly. As well, it has high nickel recoveries. The smelting process, however, it requires a higher grade laterite ore, a large amount of energy to operate, and finally, doesn’t separate cobalt in ...

  • THE RECOVERY OF MAGNESIUM OXIDE AND HYDROGEN

    2020-2-3  is energy-intensive as large volumes of water must be evaporated. The energy cost is high, and the HCl stream produced is limited to approximately 20 wt% HCl. This thesis explores alternative methods of obtaining HCl from aqueous magnesium chloride solutions. Two methods are considered: the hydrolysis, under autogenous pressure, of concentrated ...

  • Houyuan Liu - Dr. - HNL Consaltancy LinkedIn

    职位: Independent Management
  • The DNi Process™ The DNI Process™

    The only commercially available, internationally implemented, process which can match the DNi Process™’s flexibility in output is High Pressure Acid Leaching (HPAL) but that process cannot treat both limonite and saprolite in one stream and is incapable of treating the entire saprolite profile – the more saprolite added the less profitable that process is.

  • Major Mines Projects Kurumbukari (Ramu) Mine

    High Pressure Acid Leach (HPAL) Magnetic separation; Mine Life: 14 years (as of Jan 1, 2019) ... Nickel, cobalt and other elements are absorbed by the clays in the saprolite, or directly precipitated from the colloidal solution, or enriched in secondary nickel silicate minerals, consequently forming a lateritic nickel-cobalt deposit within the ...

  • Global Mining Research - HPAL: Upping the Pressure

    High Pressure Acid Leaching HPAL is the most widely adopted technology for processing lower grade limonite ores, particularly given the Caron process is no longer seen as economic. It represents >10% of global nickel supply and given the growing demand for nickel sulphate (and cobalt), its share is expected to increase in the future. Though the ...