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the chemistry of copper heap leaching

Heap Leaching - an overview ScienceDirect Topics

2.1 Leaching. Most copper leaching is done by piling broken ore (∼0.5% Cu) into flat-surface, 3–10m high, 10 4 –10 5 m 2 heaps of ore and then sprinkling dilute sulfuric acid lixiviant on to the heap surface. The lixiviant trickles down through the heap and leaches copper from its minerals to produce a pregnant leach solution containing 1–5kg Cum −3.

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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

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Leaching of copper concentrates - University of Arizona

copper oxides have been in common use for some time. Prior to the development of the Sherritt-Gordon process for nickel and cobalt in which copper is recovered as high grade copper sulfide, copper sulfides were economically recovered in a hydrometallurgical process only during the leaching of waste dumps. . Need for Hydrometallurgical Processes

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(PDF) Copper leaching from primary sulfides: Options for ...

Copper leaching from primary sulfides: Options for biological and chemical extraction of copper . × ... Options for biological and chemical extraction of copper. Behrouz Ansari. Download PDF. Download Full PDF Package. This paper. A short summary of this paper. 37 Full PDFs related to this paper.

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Particle size distribution for copper heap leaching ...

depleted of copper, the raffinate, is recycled to the heap. Detailed analysis of copper heap leaching systems should involve both the chemistrylbiochemistry and the mechanics of the system. Optimum design of the chemistry, utilization of reactants (acid, air, microorganisms, bacteria population, iron), is limited by our current understanding of ...

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US20160258036A1 - Heap Leaching of Copper - Google Patents

A method of leaching copper from a heap of ore that 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.

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Solution chemistry factors for gold thiosulfate heap leaching

Sep 29, 2003  The chemistry of copper catalytic thiosulfate leach is a complicated system due to the simultaneous presence of ammonia, thiosulfate and Cu(II)–Cu(I) redox couple, especially for a heap leach

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Application of SART to Heap Leaching of Gold-Copper

cyanide soluble copper as a relatively pure copper sulphide. The process also allows effective recovery and recycle of cyanide back to the heap leach operation. This paper reviews the SART process chemistry and presents a summary of SART bench-scale and pilot plant .

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Leaching Process - Chemistry of Extracting Substances via ...

Types of Leaching Processes in Metallurgy. A few types of leaching processes used industrially for metallurgic purposes include: Heap leaching, a process used to extract copper, uranium, and some precious metals from their ores. Another process in which copper and uranium are recovered is via a process called In-Situ Leaching.

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STUDIES ON THE CURING AND LEACHING KINETICS OF

Table 2.3 Copper oxide leaching reactions (Watlin 2006) ..... 14 Table 2.4 Copper sulfide leaching reactions (Watlin 2006) ..... 14 Table 2.5 Important gangue leaching reactions in copper heap leaching

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Leaching Process - Examples, Types, Advantages and ...

Ans: The heap leaching is a kind of industrial mining process which is useful for the extraction of precious metals, uranium, copper and several other compounds from their respective ores. This is done with the help of a series of chemical reactions that tend to absorb specific minerals and tend to re-separate them once they undergo a division ...

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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 Mining and Processing: Processing Copper Ores ...

The leaching reagent (dilute sulfuric acid) is sprayed through sprinklers on top of the heap pile and allowed to trickle down through the heap, where it dissolves the copper from the ore. The resulting “pregnant” leach solution of sulfuric acid and copper sulfate is collected in a small pool.

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HEAP LEACH – SX/EW Percolating liquids

eap leaching may appear to be simple but it is in fact a very complex process. “A plethora of technologies such as material handling, environmental control, analytical techniques, solution chemistry, hydrology and many others contribute to the design and operation of a heap leach. Heap leaching requires an inter-disciplinary approach

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Heap Leaching Oxide and Sulfide Copper Ores

Jun 22, 2019  Heap leaching is a simple means of recovering copper from oxide and oxide-sulfide ores. Although this method requires relatively low capital investment, it suffers from low copper recoveries and relatively high acid consumption. The objectives of this study were (1) to determine what factors influence these shortcomings, and (2) to establish a ...

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Treatment of copper-rich gold ore by cyanide leaching ...

chemistry of ammoniacal cyanide leaching is rather complex with intimate interactions among the species of ammonia, copper and cyanide. The presence of copper as sulphides increases the complexity of the system. Therefore, ammoniacal cyanide leaching of a copper sulphide-rich, high grade gold ore was investigated using

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Innovations in Copper: Mining Extraction: Producing ...

Heap leaching of ore may involve mesophilic or thermophilic (high temperature) microorganisms, i.e., archaea, depending on the mineral species present and the physical chemistry of the leach environment. Leaching of chalcopyrite and concentrate leaching requires thermophilic microorganisms. (Chalcopyrite can be leached using mesophilic bacteria ...

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A comprehensive model for copper sulphide heap leaching

A model of the dump leaching process that incorporates column is generally good especially for copper recovery. All of the oxygen balance, heat balance, and air convection. Metall. Trans. B 6B, 617–624. main features of the PLS are captured even if exact values vary for Croft, T.N., Pericleous, K., Cross, M., 1995.

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US20160258036A1 - Heap Leaching of Copper - Google Patents

A method of leaching copper from a heap of ore that 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.

Read More
WO2015059551A1 - 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.

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Copper leaching from primary sulfides: Options for ...

Sep 01, 2006  For simple copper leaching from chalcopyrite concentrates with an associated heap leach, the AAC–UBC process and the TPOX each give excellent credits for acid. The choice of which process to choose may come down to a consideration of acid demand (i.e. the acid production ability of TPOX may be excessive for the demands of the heap).

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STUDIES ON THE CURING AND LEACHING KINETICS OF

Table 2.3 Copper oxide leaching reactions (Watlin 2006) ..... 14 Table 2.4 Copper sulfide leaching reactions (Watlin 2006) ..... 14 Table 2.5 Important gangue leaching reactions in copper heap leaching

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Improvements in Copper heap leaching by use of wetting

Heap leaching belongs to the group of percolation leaching processes and operates over ground. The procedure is illustrated in Figure 1.The oxide copper ore is piled up on leach pads, which have a slight slope of approx. 3° and a rubber lining, which seals the ground under the heap.

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Leaching Process - Chemistry of Extracting Substances via ...

Types of Leaching Processes in Metallurgy. A few types of leaching processes used industrially for metallurgic purposes include: Heap leaching, a process used to extract copper, uranium, and some precious metals from their ores. Another process in which copper and uranium are recovered is via a process called In-Situ Leaching.

Read More
Application of SART to Heap Leaching of Gold-Copper

cyanide soluble copper as a relatively pure copper sulphide. The process also allows effective recovery and recycle of cyanide back to the heap leach operation. This paper reviews the SART process chemistry and presents a summary of SART bench-scale and pilot plant .

Read More
Copper Mining and Processing: Processing Copper Ores ...

The leaching reagent (dilute sulfuric acid) is sprayed through sprinklers on top of the heap pile and allowed to trickle down through the heap, where it dissolves the copper from the ore. The resulting “pregnant” leach solution of sulfuric acid and copper sulfate is collected in a small pool.

Read More
A comprehensive model for copper sulphide heap leaching

A model of the dump leaching process that incorporates column is generally good especially for copper recovery. All of the oxygen balance, heat balance, and air convection. Metall. Trans. B 6B, 617–624. main features of the PLS are captured even if exact values vary for Croft, T.N., Pericleous, K., Cross, M., 1995.

Read More
Treatment of copper-rich gold ore by cyanide leaching ...

chemistry of ammoniacal cyanide leaching is rather complex with intimate interactions among the species of ammonia, copper and cyanide. The presence of copper as sulphides increases the complexity of the system. Therefore, ammoniacal cyanide leaching of a copper sulphide-rich, high grade gold ore was investigated using

Read More
Innovations in Copper: Mining Extraction: Producing ...

Heap leaching of ore may involve mesophilic or thermophilic (high temperature) microorganisms, i.e., archaea, depending on the mineral species present and the physical chemistry of the leach environment. Leaching of chalcopyrite and concentrate leaching requires thermophilic microorganisms. (Chalcopyrite can be leached using mesophilic bacteria ...

Read More
US8070851B2 - Chloride heap leaching - Google Patents

A heap leaching method to recover copper from a primary copper sulphide mineral wherein the mineral is leached in an acidic chloride/sulphate solution in the presence of oxygen with the surface potential of the mineral below 600 mV (vs. SHE) to cause dissolution of the copper sulphide.

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Agglomeration of fine-sized copper ore in heap leaching ...

Dec 01, 2020  1. Introduction. Heap leaching is a low-cost, flexible hydrometallurgical process for recovering valuable metals from low-grade ores (Nosrati et al., 2012).In this process, the ore bed must be porous and permeable to permit flow of the leach solution (Lewandowski and Kawatra, 2009a).However, fine particles usually migrate into the porous structures and clog the natural flow paths, because of ...

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Bioleaching: Introduction, Methods, Application, Copper ...

Generally heap leaching process is employed in copper leaching process but sometimes a combination of heap leaching and in situ leaching processes are used. The solution (Sulphate/Fe 3 solution) is sprinkled over the heap which percolates through the ore and collects at the bottom pit. The solution collecting in the bottom pit will include ...

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