Industry: Minerals Processing
minerals, producing a copper-laden liquid called "pregnant leach solution" (PLS). The PLS flows to a collection reservoir, and then to a solvent extraction plant where it is mixed with a diluent designed to extract the copper. The leach solution minus its copper, called "raffinate", is replenished and returned to the leach pile
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Separation and Recovery of Copper from Ammonia Pregnant …
The pregnant leach solution (PLS) obtained when 10 g/L goldfieldite ore was leached using 1.7 mol/L ammonia solution at 75 °C within 120 min was employed …
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TENORM: Copper Mining and Production Wastes
The leached liquid containing the dissolved copper, known as a pregnant leach solution (PLS), is later collected and further processed to extract the copper. The liquid leachate may lead to TENORM contamination in the surrounding environment by seeping into the ground water at abandoned and active copper mining sites.
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(PDF) Copper heap leaching: Process, principles …
Heap leaching generates a pregnant leach solution (PLS) containing 1–6 g/L Cu²⁺, which is sent to solvent extraction and electrowinning for copper production.
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Solvent Extraction
The LIX® range of solvent extractants are applicable to leach solutions with a wide range of copper tenors, pH and impurity levels. They have been successfully used to …
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Review of gold leaching in thiosulfate-based solutions
GUDKOV et al [81] suggested that the addition of sodium sulfite could stabilize the leaching solution and accelerate the dissolution of gold and silver. However, sulfite ions will also cause a rapid reduction of copper ions which will dramatically decrease with an excessive increase of sulfite in the leaching solutions, as given in Eqs.
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Extraction of Copper from Pregnant Leach Solution (PLS) …
DOI: 10.1080/08827508.2024.2340545 Corpus ID: 269175301; Extraction of Copper from Pregnant Leach Solution (PLS) and Reduction of Crud Formation @article{Chepushtanova2024ExtractionOC, title={Extraction of Copper from Pregnant Leach Solution (PLS) and Reduction of Crud Formation}, author={Tatyana …
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Recovery of yttrium and neodymium from copper pregnant leach solutions
The solvent extraction of yttrium and neodymium from copper pregnant leach solutions (PLS) using Primene JM-T, a primary aliphatic amine, has been studied. Effect of contact time, pH, sulfate concentration, and extractant concentration were investigated using synthetic and actual PLS systems. Standard experimental conditions were 5 min contact ...
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Separation and Recovery of Copper from Ammonia …
aqueous solutions while distilled kerosene purchased from GAIDAM Filling Station, Barnawa Road, Kaduna, Kaduna State, Nigeria was used to prepare all organic solutions. The Cyanex®272 extractant and other analytical reagents used for this test were of analytical grades. The pregnant leach solution (PLS) obtained when 10 g/L goldfieldite …
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Hydrophobic eutectic solvents for the selective solvent …
Mo and Re are obtained from the leaching of molybdenite [1], [2], with a pregnant leach solution (PLS) mainly composed of Mo, Re, Copper (Cu), and Iron (Fe) [1] as a product, from which the two first have to be separated and purified by means of solvent extraction (SX).
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Solvent extraction of yttrium and rare earth elements from copper …
The recovery of yttrium and neodymium from copper pregnant leach solution (PLS) has been reported by Hiskey and Copp (2018). Large scale heap and stockpile leaching accounts from significant copper production. In 2015, leaching accounted for 18% of the world's primary copper production, and over 50% of the …
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Direct copper recovery from pregnant leaching solutions …
ABSTRACT. This study shows the feasibility of recovering copper directly from Pregnant Leaching Solutions (PLS), using the reactive electrodialysis technique, without the …
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Proposed reactive electrodialysis cell. | Download Scientific …
This study shows the feasibility of recovering copper directly from Pregnant Leaching Solutions (PLS), using the reactive electrodialysis technique, without the need of solvent extraction.
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Heap Leaching
Heap leaching is the most important method of hydrometallurgical copper extraction. Heap leaching is used for treating oxide and lower-grade secondary sulfide ores that contain up to ∼2% Cu. The ore is crushed to a uniform particle size (typically 12–50 mm), often agglomerated, and then stacked on large flat-topped heaps in a controlled manner.. …
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DEVELOPMENT AND IMPLEMENTATION OF SOLVENT EXTRACTION PROCESS FOR COPPER
The copper Pregnant Leach Solution (PLS), obtained via ammonia leaching of bottom ash, is reported to the solvent extraction (SX) section, where copper is recovered and cathode copper is produced in the electrowining (EW) circuit using stainless steel blanks. The solvent extraction section consists of 4 (four) mixer-settler units: 1 (one) for ...
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Recovery of yttrium and neodymium from copper pregnant leach solutions
The copper pregnant leach solution (PLS) contains a number of metals of economic interest even at very dilute concentrations. The U.S. Bureau of Mines investigated the recovery of uranium from copper bearing solutions containing approximately 12 ppm U 3 O 8 by ion exchange (George et al., 1968a). Commercial scale by-product uranium …
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Acid Leaching
The treatment of copper ores, both oxides and sulfides by means of flotation, hydrometallurgy or other processes has been well established for many years. Flotation has been applied generally to the treatment of sulfide ores, both in small and large scale operations. Hydrometallurgical methods alone or in combination with flotation have …
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Solvent extraction of yttrium and rare earth elements from copper …
The solvent extraction of yttrium and rare earth elements from copper pregnant leach solutions (PLS) using Primene JM-T, a primary aliphatic amine, has been studied. This investigation focused on the effect of extractant concentration to obtain a better understanding of the extraction mechanism. Copper bearing PLS from a leaching …
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Selective removal of iron(III) from synthetic copper(II) …
tions after the leaching process. This technology has been used in large scale for the extraction of copper from a pregnant leach solution (PLS) (Free and Moats, 2014; Schlesinger et al., 2011). Basically, in this process the valuable metal ion is transported from an aqueous into an organic phase by means of an extracting reagent or extractant ...
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SOLVENT EXTRACTION OF VALUABLE METALS FROM …
Solvent extraction of valuable metals from pregnant leach solutions of cupriferous shale 367 EXPERIMENTAL The initial composition of pregnant leach solution applied for preliminary investigations of copper(II), cobalt(II) and nickel(II) recovery by means of solvent extraction is indicated in Table 1. The solution was a pregnant liquor from
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Recovery of Yttrium and Neodymium From Copper Pregnant Leach Solutions
The solvent extraction of yttrium and neodymium from copper pregnant leach solutions (PLS) using Primene JM-T, a primary aliphatic amine, has been studied. Effect of contact time, pH, sulfate ...
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World Copper Solvent Extraction Plants: Practices and …
Konkola Copper, Chingola Leach Plant, new tank house Zambia 30 States (2001); OMG Kokkola Copper, Finland (2001); Bwana Mkubwa expan- ... pregnant leach solution (PLS) grades have been reduced over time and, subsequently, fl ow rates have increased. Additional information about SX plant
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Pregnant leach solutions (PLS) conditions
An alternative copper concentrate leaching process using sodium nitrate and sulfuric acid diluted in seawater followed by gas scrubbing to recover the sodium nitrate has been evaluated.
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Obtention of Suitable Pregnant Leach Solution (PLS) for Copper …
Copper leaching presents an environmentally friendly alternative to traditional sulfide ore processing methods. This study investigates an efficient leaching process for copper concentrate, utilizing a solution of sulfuric acid (H2SO4) and potassium iodide (KI) in a chloride medium (NaCl), enhanced by hydrogen peroxide (H2O2) at …
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A Review of Thiosulfate Leaching of Gold: Focus on …
Thiosulfate leaching is a promising alternative to cyanidation, and the main hindrances for its wide commercial application are the high thiosulfate consumption and the difficult recovery of dissolved gold. In this review, the four solutions to reduce the consumption of thiosulfate, including the control of reaction conditions, the use of additives, the …
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Separation and Recovery of Copper from Ammonia Pregnant Leach Solution …
DOI: 10.1007/s42250-023-00802-4 Corpus ID: 264468249; Separation and Recovery of Copper from Ammonia Pregnant Leach Solution (PLS) by Cyanex®272 @article{Chindo2023SeparationAR, title={Separation and Recovery of Copper from Ammonia Pregnant Leach Solution (PLS) by Cyanex{textregistered}272}, …
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Pregnant Leach Solution
The pregnant leach solutions from leaching are too dilute, (1–5kg Cu 2+ m −3) and too impure for direct production of high-purity cathodes. Electrowinning from these solutions would give dendritic, soft, and impure copper deposits.
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Minerals Processing
The hydrometallurgical process of solvent extraction/electrowinning (SX/EW) of copper production requires volumetric flow measurements for control and efficiency. Due to the characteristics of the pregnant leach solution (PLS) during the leaching process, scaling often prevents accurate measurement readings.
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Direct copper recovery from pregnant leaching solutions …
This study shows the feasibility of recovering copper directly from Pregnant Leaching Solutions (PLS), using the reactive electrodialysis technique, without the need of solvent extraction. ... Ruiz D. 2021. Removal of chloride ions from a copper leaching solution, using electrodialysis, to improve the uranium extraction through ion-exchange. …
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Copper Mining and Processing: Processing …
The resulting "pregnant" leach solution of sulfuric acid and copper sulfate is collected in a small pool. The copper compound can now be seen at concentrations of between 60-70%. The second step is solvent …
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