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  • Microwave-enhanced selective leaching of arsenic from ...

    In this work, a feasible microwave-enhanced leaching process was developed for arsenic selective removal from copper smelter dusts, and arsenic leaching efficiency could reach ∼98 % after leaching for 10 min with 0.5 molL −1 alkaline solution, in contrast to 86 % removal for the conventional electrical-heating leaching with even a more ...

  • Cited by: 1
  • Enhanced extraction of copper from cupriferous biotite by ...

    In this research, aiming to improve copper recovery, enhanced acid leaching of copper from cupriferous biotite by organic intercalation was conducted. Factors that affect copper leaching efficiency such as temperature, acid concentration, intercalant type and dosage were studied systematically.

  • Author: Baoqiang Yu, Jue Kou, Yi Xing, Chunbao Sun
  • Enhancement of copper recovery by acid leaching of high ...

    Main challenges of Yangla Copper Mine such as poor permeability was discussed. • A novel integrated leaching method for high-mud copper oxides was presented. • Multiple enhanced methods during acid leaching process were applied. • Technological measures made hydrometallurgy factory of Yangla Copper Mine resumed production.

  • Cited by: 9
  • Enhanced leaching of copper from chalcopyrite in hydrogen ...

    The first series of leaching experiments involved establishing the effect of ethylene glycol on chalcopyrite dissolution. As shown in Fig. 1, about 15% dissolution was effected in the absence of glycol, while dissolution was enhanced significantly in its presence.Higher ethylene glycol concentrations were used to check the possibility of complete dissolution of chalcopyrite.

  • Cited by: 79
  • (PDF) Enhancement of copper recovery by acid leaching of ...

    The order of factors effecting the copper leaching rate of the ores in acid leaching experiments was temperature > sample size > H2SO4 concentration > leaching time > stirring speed.

  • Experimental research in leaching of copper-bearing ...

    In our investigation, we studied the effects of ultrasonic treatment on the leaching process using an experiment in ultrasonic enhanced tailing leaching and propose a new method to decrease the leaching time of copper tailings. 2 Mechanism of ultrasonic enhancement An ultrasonic wave is a kind of sonic wave, with frequency higher than 20 kHz.

  • Cited by: 14
  • Experimental research in leaching of copper-bearing ...

    In our investigation, we studied the effects of ultrasonic treatment on the leaching process using an experiment in ultrasonic enhanced tailing leaching and propose a new method to decrease the leaching time of copper tailings. 2 Mechanism of ultrasonic enhancement An ultrasonic wave is a kind of sonic wave, with frequency higher than 20 kHz.

  • Enhanced leaching of copper from chalcopyrite in hydrogen ...

    The first series of leaching experiments involved establishing the effect of ethylene glycol on chalcopyrite dissolution. As shown in Fig. 1, about 15% dissolution was effected in the absence of glycol, while dissolution was enhanced significantly in its presence.Higher ethylene glycol concentrations were used to check the possibility of complete dissolution of chalcopyrite.

  • (PDF) Enhancement of copper recovery by acid leaching of ...

    The order of factors effecting the copper leaching rate of the ores in acid leaching experiments was temperature > sample size > H2SO4 concentration > leaching time > stirring speed.

  • Enhanced Recovery of Copper - Heap Solutions

    Enhanced metal recovery with subsurface leaching is a means to recover lost copper from compacted ore, prior to mine closure. HGI has been helping design, monitor, and verify the effectiveness of subsurface leaching in heap leach facilities for nearly a decade.

  • US8795612B2 - Leaching process for copper concentrates ...

    A method of recovering copper from chalcopyrite concentrate by chemical leaching, using pyrite and silver. The catalytic properties of pyrite in the chalcopyrite leaching process are significantly enhanced by pretreating the pyrite with silver ions. Particulate pyrite is exposed to a solution containing silver ions to form silver-treated pyrite.

  • Heap leaching a stack of gold MiningFeeds

    Apr 25, 2018  Heap leaching is used to extract gold, copper, silver, uranium, and iodine. This method was first employed to extract copper at the Bluebird mine in the US in the early 1960s, and then by several gold mines in the western parts of the US a few years later. Since then, heap leaching has been adopted successfully by many mines across the world.

  • (PDF) Bioleaching of Copper and Iron from Grasberg Ore ...

    In electrochemical bioleaching process, both the rate and extent of copper extraction were selectively (with respect to iron) enhanced in the pyritic copper concentrate in which about 90% copper ...

  • (PDF) Leaching of copper oxide with different acid solutions

    Leaching and adsorption of the copper ore sample was carried out using sulphuric acid of varying molarity -3M, 2M, 1.5M, 1M and 0.5M – and two Lanthanum and

  • Minerals Free Full-Text Copper Bioleaching in China ...

    The considerable research completed by researchers is summarized, especially focusing on the isolation and identification of leaching bacteria, the bioleaching mechanism and interface reactions, multistage percolation behavior, bioleaching system reconstruction, the multiphysics coupled model, and enhanced copper bioleaching from waste printed ...

  • Recent Developments in Copper Hydrometallurgy

    Morenci Enhanced Stockpile Leaching Low-grade ore from Western Copper deposit yBelow mill cut off grade material yMixed sulfide minerals – chalcopyrite, chalcocite y188 million ton stockpile to be constructed yAir injection yBacteria augmentation yControlled solution application Largest engineered chalcopyrite stockpile leach in the world

  • Heap Leaching Gold Silver Ores

    An investigation of a particle agglomeration technique as a means of increasing the percolation rate of leaching solutions through heaps of clayey or finely crushed, low-grade, gold and silver ores.Bench-scale and pilot-scale experiments conducted on different ores indicated that the percolation rate of cyanide leaching solution was enhanced markedly by mixing the ore with a binder, such as ...

  • Autoclave Leaching of Copper Nickel Matte

    Previous investigators have reported that the copper extraction is enhanced by the presence of ferric ion. Therefore, agitator speed of over 100 rpm are required to oxidize the ferrous ion to the ferric state and the latter appears to enhance the copper extraction. ... Autoclave leaching of the matte residue extracted over 95 pct of the nickel ...

  • Leaching of Copper Sulphides - SAIMM

    POX in a copper heap leach circuit. Figure 2. Simplified ferric leaching flowsheet. Figure 3. Copper chloride leach process. Leaching Chemistry As outlined earlier, the leaching chemistry that takes place within a total POX autoclave is very complex and will vary from case to case according to the mineralogy of the concentrate fed to the

  • Enhanced Heap Leaching – I. Insights

    Enhanced Heap Leaching – I. Insights Shlomo Orr Abstract Flow in heaps and dumps is essentially a two-phase flow phenomenon, though for many applications it could be simplified as unsaturated flow. Unlike saturated flow (typical of groundwater flow) where ... (of copper-bearing mineralized rocks) in Sweden, Eriksson and Destouni (1997 ...

  • Autoclave Leaching of Copper Nickel Matte

    Previous investigators have reported that the copper extraction is enhanced by the presence of ferric ion. Therefore, agitator speed of over 100 rpm are required to oxidize the ferrous ion to the ferric state and the latter appears to enhance the copper extraction. ... Autoclave leaching of the matte residue extracted over 95 pct of the nickel ...

  • US8795612B2 - Leaching process for copper concentrates ...

    A method of recovering copper from chalcopyrite concentrate by chemical leaching, using pyrite and silver. The catalytic properties of pyrite in the chalcopyrite leaching process are significantly enhanced by pretreating the pyrite with silver ions. Particulate pyrite is exposed to a solution containing silver ions to form silver-treated pyrite.

  • COPPER BIOLEACHING Wang Leiming 1 updates 6 ...

    And a maximum of 95.32% copper leaching rate with a relatively low Fe3+ concentration (329.00 mgL-1) was obtained in presence of 1.0 g powdered ARW compared to only 83.40% in its absence ...

  • Plant uptake and leaching of copper during EDTA-enhanced ...

    Key words:copper, EDTA, phytoremediation,plant uptake, leaching Abstract EDTA-enhanced phytoremediationof copper contaminated soil was evaluated. Up to 740µgg−1 of Na2H2 EDTA in solution was added to repacked soil columns, and intact cores of a sandy loam of volcanic origin, that was growing Agrostis tenuis.

  • Enhanced Heap Leaching – I. Insights

    Enhanced Heap Leaching – I. Insights Shlomo Orr Abstract Flow in heaps and dumps is essentially a two-phase flow phenomenon, though for many applications it could be simplified as unsaturated flow. Unlike saturated flow (typical of groundwater flow) where ... (of copper-bearing mineralized rocks) in Sweden, Eriksson and Destouni (1997 ...

  • Heap leaching a stack of gold MiningFeeds

    Apr 25, 2018  Heap leaching is used to extract gold, copper, silver, uranium, and iodine. This method was first employed to extract copper at the Bluebird mine in the US in the early 1960s, and then by several gold mines in the western parts of the US a few years later. Since then, heap leaching has been adopted successfully by many mines across the world.

  • (PDF) Leaching of copper oxide with different acid solutions

    Leaching and adsorption of the copper ore sample was carried out using sulphuric acid of varying molarity -3M, 2M, 1.5M, 1M and 0.5M – and two Lanthanum and

  • Minerals Free Full-Text Copper Bioleaching in China ...

    The considerable research completed by researchers is summarized, especially focusing on the isolation and identification of leaching bacteria, the bioleaching mechanism and interface reactions, multistage percolation behavior, bioleaching system reconstruction, the multiphysics coupled model, and enhanced copper bioleaching from waste printed ...

  • Leaching of Copper from Cuprous Oxide in Aerated Sulfuric

    The leaching ef˜ciency of copper was reported to be about 50% in the case of leaching in sulfuric acid solution without other oxidants7–9). Although Sullivan and Oldright7 ) and Majima et al.9 observed that the intro-duction of oxygen or air enhanced the leaching ef˜ciency of copper by employing single experimental set without further

  • Bioleaching - Wikipedia

    Bioleaching is the extraction of metals from their ores through the use of living organisms.This is much cleaner than the traditional heap leaching using cyanide. Bioleaching is one of several applications within biohydrometallurgy and several methods are used to recover copper, zinc, lead, arsenic, antimony, nickel, molybdenum, gold, silver, and cobalt

  • Leaching of Malachite Ore in NH3-Saturated Water ...

    Jun 24, 2004  In this study, the leaching kinetics of malachite [CuCO3Cu(OH)2], an oxidized copper ore, was investigated in water saturated with ammonia gas. In the experiments, the ammonia concentration of the solution, the particle size of the ore, the temperature, the stirring speed, and the solid-to-liquid ratio were chosen as parameters. It was determined that the leaching rate of malachite

  • (PDF) Treatment of Sulfide Minerals by Oxidative Leaching ...

    copper, zinc, nickel and cobalt in acid oxidative leaching of chalcopyrite at the presence of deep-sea manganese nodules as oxidant.’’ Hydrometallurgy , 77(1–2), pp. 51–59.

  • Leaching of Copper Sulphides - SAIMM

    POX in a copper heap leach circuit. Figure 2. Simplified ferric leaching flowsheet. Figure 3. Copper chloride leach process. Leaching Chemistry As outlined earlier, the leaching chemistry that takes place within a total POX autoclave is very complex and will vary from case to case according to the mineralogy of the concentrate fed to the

  • Method of leaching of nickel-copper matte

    The residue after stage leaching of Nickel under pressure, containing mainly digenite, is fed to the next stage, i.e. the stage of leaching of copper under pressure 4, which can also be called full leaching, because all the copper, as well as the last remnants of Nickel and cobalt may still remaining in the sediment, leach the anolyte ...

  • Heap leaching a stack of gold MiningFeeds

    Apr 25, 2018  Heap leaching is used to extract gold, copper, silver, uranium, and iodine. This method was first employed to extract copper at the Bluebird mine in the US in the early 1960s, and then by several gold mines in the western parts of the US a few years later. Since then, heap leaching has been adopted successfully by many mines across the world.

  • Plant uptake and leaching of copper during EDTA-enhanced ...

    Key words:copper, EDTA, phytoremediation,plant uptake, leaching Abstract EDTA-enhanced phytoremediationof copper contaminated soil was evaluated. Up to 740µgg−1 of Na2H2 EDTA in solution was added to repacked soil columns, and intact cores of a sandy loam of volcanic origin, that was growing Agrostis tenuis.

  • Leaching of Malachite Ore in NH3-Saturated Water ...

    Jun 24, 2004  In this study, the leaching kinetics of malachite [CuCO3Cu(OH)2], an oxidized copper ore, was investigated in water saturated with ammonia gas. In the experiments, the ammonia concentration of the solution, the particle size of the ore, the temperature, the stirring speed, and the solid-to-liquid ratio were chosen as parameters. It was determined that the leaching rate of malachite

  • Enhanced Heap Leaching: II. Applications

    Enhanced Heap Leaching: II. Applications Shlomo Orr and Velimir Vesselinov Abstract In our 1st article (Orr, 2000), we investigated different flow and transport phenomena that could significantly reduce leaching recovery. The combination of such understanding with advanced flow and

  • CA2928524A1 - Heap leaching of copper - Google Patents

    A method of leaching copper from a heap of ore which method includes at least one resting step followed by an irrigation step, wherein, during the irrigation step a leach solution that contains chloride ions is applied to the ore at a higher rate than during the resting step.

  • Leaching of Copper from Cuprous Oxide in Aerated Sulfuric

    The leaching ef˜ciency of copper was reported to be about 50% in the case of leaching in sulfuric acid solution without other oxidants7–9). Although Sullivan and Oldright7 ) and Majima et al.9 observed that the intro-duction of oxygen or air enhanced the leaching ef˜ciency of copper by employing single experimental set without further

  • Copper extraction - Wikipedia

    All primary sulfide ores of copper sulfides, and most concentrates of secondary copper sulfides (being chalcocite), are subjected to smelting.Some vat leach or pressure leach processes exist to solubilise chalcocite concentrates and produce copper cathode from the resulting leachate solution, but this is a minor part of the market.. Carbonate concentrates are a relatively minor product ...

  • Improvements in Copper heap leaching by use of wetting

    Modelling copper heap leaching Leaching implies a reaction between solid particles and a liquid phase. The “shrinking core” model describes the leaching process of an idealized oxide copper ore particle [1]. This particle reacts from the surface inwards. During the continuous reaction a leached rim is formed, composed mainly of gangue.

  • Method of leaching of nickel-copper matte

    The residue after stage leaching of Nickel under pressure, containing mainly digenite, is fed to the next stage, i.e. the stage of leaching of copper under pressure 4, which can also be called full leaching, because all the copper, as well as the last remnants of Nickel and cobalt may still remaining in the sediment, leach the anolyte ...

  • Leaching of Copper Sulphides - SAIMM

    POX in a copper heap leach circuit. Figure 2. Simplified ferric leaching flowsheet. Figure 3. Copper chloride leach process. Leaching Chemistry As outlined earlier, the leaching chemistry that takes place within a total POX autoclave is very complex and will vary from case to case according to the mineralogy of the concentrate fed to the

  • US3403020A - Leaching of copper from ores with cyanide and ...

    US3403020A US418324A US41832464A US3403020A US 3403020 A US3403020 A US 3403020A US 418324 A US418324 A US 418324A US 41832464 A US41832464 A US 41832464A US 3403020 A US3403020 A US 3403020A Authority US United States Prior art keywords copper cyanide ore hcn recovery Prior art date 1964-12-14 Legal status (The legal status is an assumption and is not a legal

  • Copper Leaching Behavior from Waste Printed Circuit Board ...

    The Cu(II)-ammine complex significantly enhanced the leaching rate, while the Cu(I)-ammine complex slightly depressed it. Crushing of the PCB effectively enhanced the leaching rate, because the exposed metallic copper area is increased by the crushing. The effect of temperature on the leaching

  • TENORM: Copper Mining and Production Wastes Radiation ...

    When processing copper through heap leaching, vast quantities of ore and overburden overburdenSoil and rocks that have been moved out of the way to get to ore are called "overburden." In areas where there are high concentrations of radionuclides in the rock, overburden may have some enhanced radioactivity, but not enough to mine and process.

  • Application of SART to Heap Leaching of Gold-Copper

    for copper leaching is 0.1 kg NaCN/t. If the quantity of copper extracted increases to 300 g/t then the cyanide requirement increases to 0.7 kg NaCN/t. Viewed another way, since the 3 moles of cyanide that are complexed with each mole of copper in the leach solution are effectively “inactive” as far as gold leaching is concerned, the Maricunga