Research on Reinforcing Acid Leaching of a …

The characteristics of Yangla copper oxide ore and acid leaching of this copper ore were investigated. The results indicate direct dump acid leaching of raw ore is not feasible for the treatment of this copper ore in practice. Sieve sizing …

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Research on Reinforcing Acid Leaching of a …

The results indicate direct dump acid leaching of raw ore is not feasible for the treatment of this copper ore in practice. Sieve sizing-warming-stirring-acid leaching process was employed for the treatment of the fine grain materials …

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Acid leaching of oxide–sulfide copper ore prior the …

balance ore stored as a dump at the open pit edge, as is illustrated in Figure 1. Figure 1. A photograph of the dump, formed of out of balance ... M.D. SOKIĆ et al.: ACID LEACHING OF OXIDE-SULFIDE COPPER ORE Hem. ind. 69 (5) 453–458 (2015) 455 tion (2.5 dm3), and the time of leaching was measured.

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Toxic Treasure at the Agbogbloshie Dump in Ghana

In the Agbogbloshie dump in Ghana, workers strip electronic cables in order to uncover "gold, silver, copper and other valuable metals.". Workers resort to "acid leaching and cable burning" to more easily and economically strip cables, but these practices release harmful chemicals and byproducts that impact the health of people and the ...

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CN101768665A - Method for reducing acid consumption during heap ...

The invention discloses a method for reducing acid consumption during heap leaching and high-pressure leaching of nickel laterite ore, which combines the heap leaching technology with the high-pressure leaching technology to reduce acid consumption during the treatment of nickel laterite ore; residual sulfuric acid in coarse particle immersion of limonite heap is sufficiently …

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Leaching Process - Examples, Types, Advantages and …

The extraction of metal from ore using acid and sugar from beets using hot water are two commercial applications of leaching. The solid mixture to be separated in a typical leaching process consists of particles, inert insoluble carrier A, and solute B.All of the solute is dissolved by the solvent in an ideal leaching equilibrium stage, but ...

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Pressure leach - atozwiki.com

Acid leaching (e.g. sulfide ore) Chemistry. Leaching is done in long pressure vessels which are cylindrical (horizontal or vertical) or of horizontal tube form known as autoclaves. A good example of the autoclave leach process can also be found in the metallurgy of zinc. It is best described by the following chemical reaction:

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Acid Mine Drainage - Department of Mines, Industry …

including oxidation rate and metal leaching. These tests typically use a larger sample volume and require a much longer time for completion than for static tests. ANALYSIS RESULTS . In terms of acid forming capacity, mine waste materials may be classified as: • Non-Acid Forming (NAF) • Potentially Acid Forming (PAF)

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Heap and dump leaching Definition | Law Insider

definition. Open Split View. Heap and dump leaching means the extraction of minerals using acid solutions applied to metallic ores that have been removed from their original location and heaped or dumped in a new location. Sample 1 Sample 2 Sample 3. Based on 3 documents. Remove Advertising.

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A comparison of the uranium recovery from low-grade ore by …

Abstract: The objective of this work was to compare the bioleaching with the acid leaching of uranium under similar process conditions within 65 days. The low-grade uranium ore used in the experiments was collected from Radoniow's 'small' dump, Poland. Bioleaching and acid leaching studies were carried out in identical columns.

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Gold & Silver Leaching Methods - Metallurgist & Mineral …

Carlin also has been dump-leaching at the Bootstrap Mine north of its Carlin pit. The Bootstrap Mine was a surface operation from the late 1960's until 1978. A sizable waste rock dump on the property is being leached. The dump was originally placed on a compacted ancient lakebed, which makes an impervious pad suitable for leach solution ...

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Bacterial Leaching - Indian Academy of Sciences

dump and heap leaching involve the application of the lixiviant to the top of the dump or heap surface and the recovery of metal laden solution that seeps to the bottom by gravity flow. The dilute sulphuric acid sprinkled on top percolates down through the dump, lowering the pH and promoting the growth of acido­ philic microorganisms.

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Alkali treatment–acid leaching of rare earth elements from ...

Phosphogypsum (PG) is the main by-product of phosphoric acid, which is produced by the sulfuric acid attack of phosphate rocks, wet process. This by-product, which contains around 2.0% phosphoric acid, is used as a low-cost soil fertilizer, PGF. PGF consists mainly of gypsum (CaSO4·2H2O), P2O5, SiO2, and other impurities, including a minor …

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Acid leaching of copper ore heap with fluoroaliphatic surfactant

Such aqueous acid leaching typically utilizes an aqueous solution of dilute sulfuric acid ("leachant"), which leaches, or dissolves, the copper from the ore. The aqueous acid leachant is typically sprayed on top of the heap or dump and allowed to percolate, or trickle, down by gravity between the ore pieces.

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Heap Leaching of Copper Ores – State of the Science

INTRODUCTION Heap leaching is one of the percolation leaching technologies, which includes in situ leaching, dump leaching, heap leaching and vat leaching (Bartlett, 1998). The common phenomenon in all these technologies is the transport of leach solution through a fixed bed of ore particles, which interacts with the solid as it migrates along ...

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Dump Leaching - 911metallurgist.com

Although ferric sulfate and acid may be responsible for much of the leaching that occurs in a sulfide leach dump, there is some evidence that …

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Acid and ferric sulfate bioleaching of uranium ores: A review

The mine used sulfuric acid leaching followed by solvent extraction with a tertiary amine extractant in an organic diluent (Taylor et al., 2004; Mudd, 2014). ... dump and stope leaching of mine waste rocks and worked-out stopes in uranium mines in the Elliot Lake area, Ontario, Canada (Campbell et al., 1985, ...

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LEACHING OF LOW-GRADE COPPER ORES: A CASE STUDY …

minerals). The leaching experiments were performed using sulphuric acid solutions, whereby the kinetics of copper leaching was investigated with respect to acid concentration and solid to liquid ratio. The copper concentration in the leach solution ranged from 0.80 to 1.75 g dm-3. The total Cu recovery rate ranged from 30 to 56 %, whereas the

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Copper Dump Leaching and Management Practices That …

Dump leaching and heap leaching are distinguished by the use of liners. Dump leaching refers to the leaching of low- grade ore that has been deposited directly on the ground. ... forms in the presence of oxygen and bacterial activity. The bacteria generate acid in situ, which provides acid for acid-consuming reactions, including oxygen ...

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Dump and Heap Leaching - HydroJex

Dump leaching has mostly been applied to gold, silver, and copper ores, whereas heap leaching has been applied to many different minerals including copper, gold, silver, ura- ... uranium minerals can be leached with sulfuric acid or in alka-line conditions employing sodium carbonate. More-complex/ less-oxidized uranium minerals require stronger ...

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XA04N0873 - Office of Scientific and Technical Information

Heap leaching is used principally for dilute sulfuric acid leaching of copper from uncrushed porous, oxidized ore that has been piled on prepared drainage pads. The leach cycle duration is in months. Dump leaching is used to extract copper from low tenor uncrushed strip waste material that must be moved during mining. Both oxide and sulfide ...

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How copper dump leaching works - ScienceDirect

A widely used method for exploiting secondary sulphide copper deposits involve leaching the ore in heaps or dumps. In both instances, ore piles are irrigated with acidic solutions that, as they percolate, promote bacterially-assisted oxidative leaching reactions that release copper ions.

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Producing Copper Nature's Way: Bioleaching

It is the leaching of sulfide minerals that distinguishes bioleaching from conventional acid leaching wherein only oxidized minerals are leached. An associated process is biooxidation. This is the oxidation of sulfide minerals …

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Recent Progress in Hydrometallurgical Processing of Nickel …

The atmospheric acid leaching at atmospheric pressure is known as DNi, and if the operation happens at high pressure, it is known as NAPL. Depending on the pressure used, the leaching operations are classified as DNi and NAPL. DNi developed and managed a one-tonne-per-day Test Plant at the CSIRO's Australian Minerals Research Centre in Western ...

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dump leaching_dump leaching

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Bioleaching - an overview | ScienceDirect Topics

Microorganisms used in bioleaching are persistently exposed to acid-leaching solutions containing elevated metal concentrations ... 000 to 40 000 tons of ore per day and produce between 10 000 and 200 000 tons of copper per year by using heap or dump bioleaching of minerals such as oxides, chalcocite, covellite, chalcopyrite, and others ...

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Dump leaching - Big Chemical Encyclopedia

the fohowing factors are important in dump leaching (/) the role of bacteria (2) the apphcation of acid to prevent or delay precipitation of hydrated ferric sulfate (j) oxidation to remove excess iron from mine water in settling pools, as shown in equations 38 and 39 (4) optimization of dump configuration for good solution distribution and (5) …

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Acid curing and agglomeration for heap leaching - ScienceDirect

In heap or dump leaching, a gelatinous precipitate may blind the ore particles and result in poorer leaching kinetics and recoveries. ... (Peak 1) was either due to altered clinochlore or the product from the reaction of clinochlore with sulfuric acid. After leaching and washing, these four peaks disappeared. 3.4. SEM and EDX analysis. Most of ...

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Stability of leaching piles, ROM piles, ballast and gravel dump

Stability of leaching piles, ROM piles, ballast and gravel dump. The leaching process is a hydrometallurgical technique, which consists of obtaining copper found in oxidized minerals, which are separated through the application of a solution of sulfuric acid and water. This technique is used to recover uranium, copper, zinc, nickel, cobalt ...

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(PDF) HEAP AND DUMP LEACH PROCESS AT THE BUCHIM …

A series of column leach tests represent the most important part of the testing program. Operating parameters such as particle size, leach time, flow rate, heap height and acid addition are evaluated.

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