Separating Si phases from diagenetically-modified …
The modified sequential leaching method used in this study is illustrated in Fig. 1 a.About 1 g of freeze-dried sediment was first treated with 3 vol/vol% hydrogen peroxide (H 2 O 2; EMSURE®, Merck) to remove organic matter following the protocol of Mortlock and Froelich (1989).The pretreatment terminated when the bubbling ceased, …
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Optimizing the Leaching Parameters and Studying the …
The study of copper (Cu) recovery is crucial for the entire recovery process of waste printed circuit boards (WPCBs), and Cu can be leached efficiently via a sulfuric …
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The Application of Diagnostic Leaching to Copper …
This paper outlines the basic methodology of diagnostic leaching applied to copper and gold ores. Also, examples of …
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Ammonia Leaching: A New Approach of Copper Industry in
Ammonia and ammonium salts have been recognized as effective leaching agents in hydrometallurgical processes due to low toxicity and cost, easy recovery and high selective recovery of metals. New research findings on considerable advantages of leaching by these agents and elimination of problems associated with acid leaching …
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In-situ leaching of copper from spent heaps
In copper heap leaching, ore is stacked in leach pads and irrigated with acidic solution. As the leaching solution percolates down through the ore bed, chemical …
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Influence of pH on the leaching behaviour of heavy …
LIU Wei-feng, FU Xin-xin, YANG Tian-zu, et al. Oxidation leaching of copper smelting dust by controlling potential [J]. ... YU Hong-fa, ZHANG Hui-fang. Extraction of aluminum by pressure acid-leaching method from coal fly ash [J]. ... of computer modelling to predict the leaching behaviour of heavy metals from MSWI fly …
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Determination of occurrence and leaching toxicity of arsenic in copper
The removal of readily soluble As and Cuâˆ'As intermetallics from smelting slag by flotation can reduce the As leaching toxicity of slag tailings, making them conform to the USEPA and SEPA regulatory thresholds for As. Key words: copper flash smelting; arsenic; copper slag; selective sequential extraction; leaching toxicity 1 Introduction ...
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Spectrophotometric determination of phosphate in …
The specific colorimetric method determined for each leaching matrix is described. The needed equipment is inexpensive and the work can be done by every laboratory that is able to measure dissolved P colorimetrically. ... However, sequential extraction and selective leaching of particles to extract P from target phases is labor …
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Metals | Free Full-Text | Selective Copper Recovery by Acid Leaching …
The most challenging issue associated with recycling the sludge generated from printed circuit boards (PCBs) is the separation of copper (Cu) from iron (Fe), using multi-stage leaching, or adding oxidizing and precipitating agents. Herein we investigated simple acid leaching to effectively extract copper and limit iron dissolution. Selective …
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Chemical leaching, precipitation and solvent extraction for sequential …
2.2. Acid leaching and recovery of metals. Early studies on recycling of spent batteries focused on optimizing the leaching conditions through orthogonal experimental design or single factor tests to achieve the highest leaching efficiency [2].In the present work, the experimental parameters, including species and concentrations of leachants …
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The Application of Diagnostic Leaching to Copper and …
Diagnostic Leaching Methodology for Copper Ores. The basis of diagnostic leaching for copper ores is the mineral's distinct thermodynamic and kinetic response in a given …
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Selective and Multi-Step Leaching of Valuable Metals from Scrap Copper
Valuable metals in smelting sludge from smelting industry have a recovery value. In this work, for realizing waste recycling effectively, selective and multi-step leaching of valuable metals was investigated with scrap copper-smelting sludge as research object. The effect of the concentration of sulphuric acid on leaching rates of …
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Selective Copper Recovery by Acid Leaching from …
circuit boards (PCBs) is the separation of copper (Cu) from iron (Fe), using multi-stage leaching, or adding oxidizing and precipitating agents. Herein we investigated simple acid leaching to effectively extract copper and limit iron dissolution. Selective copper leaching was achieved with all the acids studied, including HCl, HNO3, and H2SO4 ...
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Leaching
Heap leaching of copper oxides and transition ores and acid/neutral leaching of zinc calcine are well-established processes to generate the feed ... LiNi x Co y Mn 1-x-y O 2 can be dissolved with a leaching efficiency of 70% by acid leaching. This method is convenient and exhibits low complexity, although the potential environmental hazards ...
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Copper Analysis by Two Different Procedures of Sequential …
The ratio C/C 0 is presented in Figure 1 and Figure 2, where C 0 is the initial concentration of copper in the slice before all treatments and C is the concentration of copper in the same slice of tailing at the end of leaching and electrodialytic treatment for each analyzed fraction by the extraction sequential method, where the six-fraction ...
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Speciation characterization of arsenic-bearing phase in …
Here, we proposed a sequential leaching method to thoroughly understand the constitution of arsenic-bearing phase and the distribution of valuable elements in ASS. The results show that five major arsenic-bearing phases exist in ASS: amorphous As 2 S 3, crystalline As 4 S 4, As 2 O 3, and As atoms dissolved into the lattice of PbS and …
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A sequential leaching procedure for efficient recovery of …
The present study reports a sequential, non-acid process for effective recovery of copper and precious metals from mobile phone printed circuit boards. In this …
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Selective cobalt and nickel electrodeposition for lithium-ion …
Copper foil was employed as a working electrode for cobalt and nickel deposition; the electrodes were prepared by cutting the copper foil (thickness 0.25 mm, 99.98% trace metals basis, Sigma ...
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Sequential Bioleaching of Pyritic Tailings and Ferric Leaching …
Ferric leaching of two types of slag at 70 °C with the leachate obtained during bioleaching of the tailings and containing 15 g/L of Fe3+ allowed 88.9 and 43.4% recovery of copper and zinc ...
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A systematic review of sustainable gold extraction from …
Gold recovery methods. Following leaching, gold ions remain dissolved in the solution, together with other elements. It is necessary to recover gold ions from this solution, separating them from the other dissolved metals present. ... Sequential recovery of gold and copper from bioleached wastewater using ion exchange resins. Environ. …
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A sequential leaching procedure for efficient recovery of …
An effective method for sequential recovery of copper and precious metals (Ag, Au) without using corrosive acids or strong oxidants was developed. In the process, gold and silver were enriched during copper recovery process. ... The great difference may be attributed to the dissolution of copper during the leaching process of the raw PCBs. …
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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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A sequential leaching procedure for efficient recovery of …
The present study reports a sequential, non-acid process for effective recovery of copper and precious metals from mobile phone printed circuit boards. In this process, gold and silver were first enriched during the synthesis process of cuprous chloride and then leached by thiosulfate method. Result …
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STUDIES ON THE CURING AND LEACHING KINETICS OF …
Figure 2.11 Typical permanent heap leach operation for low grade copper oxides and secondary sulfides with minor amounts of primary copper sulfides ..... 23 Figure 3.1 Acid …
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(PDF) Copper Analysis by Two Different Procedures of Sequential …
The ratio C/C0 is presented in Figures 1 and 2, where C0 is the initial concentration of copper in the slice before all treatments and C is the concentration of copper in the same slice of tailing at the end of leaching and electrodialytic treatment for each analyzed fraction by the extraction sequential method, where the six-fraction procedure ...
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Optimizing the Leaching Parameters and Studying the Kinetics of Copper
The study of copper (Cu) recovery is crucial for the entire recovery process of waste printed circuit boards (WPCBs), and Cu can be leached efficiently via a sulfuric acid–hydrogen peroxide (H2SO4–H2O2) system. To achieve high Cu recovery, it is important to evaluate the parameters of the leaching process and understand the Cu …
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NOVEL DIAGNOSTIC AND SELECTIVE LEACHING …
Sequential leaching (dilute sulfuric acid followed by cyanide-aqua regia leach) was carried out by external commercial laboratories on the calibration samples from Sites B and C.
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Copper Mineral Leaching Mathematical …
Subsequently, in Hoseinian et al. a mathematical modeling method is used to predict the optimum leaching conditions in copper oxide mineral columns by investigating the effects of variables such as …
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Novel diagnostic and selective leaching characterisation of copper …
The Sequential Copper Analysis Method-Geological, Mineralogical and Metallurgical Implications. Jan 1995; ... "Optimizing Copper Leaching/SX-EW Operations with Mineralogical Data", SME Annual ...
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Effective Recovery Process of Copper from Waste Printed
This study presents an optimized leaching and electrowinning process for the recovery of copper from waste printed circuit boards including studies of chemical consumption and recirculation of leachate. Optimization of leaching was performed using response surface methodology in diluted sulfuric acid and hydrogen peroxide media. …
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