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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Chloride heap leaching . United States Patent 8070851 . Abstract: 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 ...
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heap leaching chloride chloride heap leaching Prior art date 2006-05-12 Application number PL07784568T Other languages Polish (pl) Inventor Elmar L Muller Petrus Basson Michael J Nicol Original Assignee Bhp Billiton Sa Ltd Priority date (The priority date
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heap leaching chloride chloride heap leaching Prior art date 2006-05-12 Application number AP200804670A Other languages English (en) Other versions AP200804670A0 (en Inventor Elmar L Muller Petrus Basson Michael J Nicol Original Assignee Bhp Billiton Sa Ltd Priority date (The priority date is an assumption and is not a legal conclusion.
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US20090173188A1 US12/266,028 US26602808A US2009173188A1 US 20090173188 A1 US20090173188 A1 US 20090173188A1 US 26602808 A US26602808 A US 26602808A US 2009173188 A1 US2009173188 A
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A heap leaching method to recover copper from a primary copper sulphide mineral wherein the mineral is leached in an acidic chloride or mixed 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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aspects of the heap leaching of copper sulfide minerals, Nicol [36] compared the anodic behavior of chalcopyrite at high potentials (transpassive region) in both sulfate and chloride solutions. Nicol et al. [37] studied the voltammetric characteristics of chalcopyrite under various conditions
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and heap leaching is also a feasible method. The Malmyzh oxidized ore is not refractory for leaching process. There are no major ... In chloride leaching, the highest extractions of copper and gold were 98% and 63%, respectively, and the highest extractions of iron, copper, gold,
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01-06-2007 An oxide gold ore was subjected to chloride/hypochlorite leaching at room temperature. The effects of three factors, including Ca(OCl) 2 vs. NaOCl, OCl − concentration, and HCl concentration on gold leaching performance were investigated. Due to formation of CaOCl + complex in solution and hence less reactivity, calcium hypochlorite produces a sluggish gold leaching kinetics, taking twice ...
Moreand heap leaching is also a feasible method. The Malmyzh oxidized ore is not refractory for leaching process. There are no major ... In chloride leaching, the highest extractions of copper and gold were 98% and 63%, respectively, and the highest extractions of iron, copper, gold,
MoreHeap leaching is a metal extraction process from low grade ores where crushed ore is stacked on an impermeable pad and irrigated from the top with a solution of chemical reagents. An enriched solution containing the targeted metal is collected at the bottom.
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Copper mines increasingly face the challenge of processing large amounts of low-grade sulfides of elevated concentrations of impurities. In most cases, the challenge is compounded by water scarcity. A potential strategy to address such challenge is to use seawater with elevated concentrations of chloride for heap leaching of secondary sulfides. To ensure success of such heap leach processes ...
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01-12-2007 Chloride leaching offers significant advantages for hydrometallurgical processing, in supporting high metal solubility, enhanced redox behaviour, and increased rates of leaching. In this system, both cuprous ion and cupric ion, as well as several other metal ions are stabilized through complexation with chloride ion ( Winand, 1991 ); and thus has potential for treating complex ores and ...
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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.
More01-06-2007 An oxide gold ore was subjected to chloride/hypochlorite leaching at room temperature. The effects of three factors, including Ca(OCl) 2 vs. NaOCl, OCl − concentration, and HCl concentration on gold leaching performance were investigated. Due to formation of CaOCl + complex in solution and hence less reactivity, calcium hypochlorite produces a sluggish gold leaching kinetics, taking twice ...
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The announcement followed the release of results in December 2013 for a scoping study of the heap leaching and direct solvent extraction/electrowinning process to be used at the NiWest project. GME said the study confirmed the technical and potential economic viability for a project at NiWest that would produce 14,000 mt/y of nickel cathode and 540 mt/y of cobalt over a minimum 20-year mine life.
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Copper extraction from primary copper sulfide ore from a typical porphyry copper deposit from Antofagasta, Chile, was investigated after leaching with a chloride-ferrous media at two temperatures. The study focused on whether this chemical leaching system could be applied at an industrial scale. Leaching tests were conducted in columns loaded with approximately 50 kg of agglomerated ore; the ...
Morechloride, seawater and sulfuric acid. The calcium chloride and sulfuric acid produce calcium sulfate, which improves the permeability of the heap and provides the chloride medium that is beneficial to leaching copper sulfides [8,12]. Several studies have involved pretreatment and subsequent leaching to improve mineral reaction rates.
More01-03-2017 Besides the direct comparison where bioleaching benefits evidently exceed those of the chloride chemical leaching, a brief economical evaluation renders a cost of production of chloride chemical leaching at 100 g/L of $0.82 USD per pound of copper, which is 47% higher than the production cost for bioleaching that was estimated at $0.56 USD/lb Cu, even considering the use of
MoreCopper mines increasingly face the challenge of processing large amounts of low-grade sulfides of elevated concentrations of impurities. In most cases, the challenge is compounded by water scarcity. A potential strategy to address such challenge is to use seawater with elevated concentrations of chloride for heap leaching of secondary sulfides. To ensure success of such heap leach processes ...
Moreand heap leaching is also a feasible method. The Malmyzh oxidized ore is not refractory for leaching process. There are no major ... In chloride leaching, the highest extractions of copper and gold were 98% and 63%, respectively, and the highest extractions of iron, copper, gold,
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with heap leaching are expected to become preferred methods: adsorption using high pKa weak-base resin columns or alternatively; staged heap leaching and direct electrowinning (where scaling is controllable and chloride levels are relatively low). direct smelting of bullion in gas-fired kilns (for larger installations), or alternatively;
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HEAP LEACH PRINCIPLES Heap leaching is a simple processing technique involving mining and crushing (optional) of the ore, which gets stacked into a heap pile on a prepared surface and is irrigated by a lixiviant. The solution percolates through the heap, dissolving the target metals of value, which are recovered in later processing stages.
Moreeap 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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20-12-2018 A method of maximising the amount of water available for rinsing in a high-chloride heap leach operation which includes the step of using process make-up water in the range of 0.05 to 0.35 m3/ton of ore to rinse leach residue ore, in the heap, thereby to displace a chloride-containing aqueous liquor from the leached ore.
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HEAP LEACHING FOR SUSTAINABLE DEVELOPMENT IN THE SOUTH AFRICAN PGM INDUSTRY *J.M. Mwase 1, J. Petersen , J.J. Eksteen2 1Department of Chemical Engineering, University of Cape Town, Private Bag, Rondebosch, South Africa, 7701
MoreThe announcement followed the release of results in December 2013 for a scoping study of the heap leaching and direct solvent extraction/electrowinning process to be used at the NiWest project. GME said the study confirmed the technical and potential economic viability for a project at NiWest that would produce 14,000 mt/y of nickel cathode and 540 mt/y of cobalt over a minimum 20-year mine life.
Morechloride, seawater and sulfuric acid. The calcium chloride and sulfuric acid produce calcium sulfate, which improves the permeability of the heap and provides the chloride medium that is beneficial to leaching copper sulfides [8,12]. Several studies have involved pretreatment and subsequent leaching to improve mineral reaction rates.
MoreCopper extraction from primary copper sulfide ore from a typical porphyry copper deposit from Antofagasta, Chile, was investigated after leaching with a chloride-ferrous media at two temperatures. The study focused on whether this chemical leaching system could be applied at an industrial scale. Leaching tests were conducted in columns loaded with approximately 50 kg of agglomerated ore; the ...
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1. A hydrometallurgical method of recovering copper from a material, in a heap, that contains a copper sulphide mineral comprising leaching the material in one of an acidic chloride solution and a mixed chloride/sulphate solution in the presence of dissolved oxygen and cupric ions as oxidants, maintaining the mineral's surface potential below about 600 mV (vs. SHE) to cause dissolution of the ...
Moreeap 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
More20-12-2018 A method of maximising the amount of water available for rinsing in a high-chloride heap leach operation which includes the step of using process make-up water in the range of 0.05 to 0.35 m3/ton of ore to rinse leach residue ore, in the heap, thereby to displace a chloride-containing aqueous liquor from the leached ore.
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heap leaching conditions. Most of the studies agree that rate of leaching of chalcopyrite in chloride media is linear with the time, but some authors have suggested that parabolic or para-linear kinetics are appropriate. In this context Dutrizac (1981), suggested that the para-linear
MoreHEAP LEACH PRINCIPLES Heap leaching is a simple processing technique involving mining and crushing (optional) of the ore, which gets stacked into a heap pile on a prepared surface and is irrigated by a lixiviant. The solution percolates through the heap, dissolving the target metals of value, which are recovered in later processing stages.
More
20-08-2015 Heap leaching (HL) is a flexible and constantly developing mineral processing and extraction technology that is gaining popularity and recognition for
MoreHEAP LEACHING FOR SUSTAINABLE DEVELOPMENT IN THE SOUTH AFRICAN PGM INDUSTRY *J.M. Mwase 1, J. Petersen , J.J. Eksteen2 1Department of Chemical Engineering, University of Cape Town, Private Bag, Rondebosch, South Africa, 7701
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Examples such as the Bacterial Thin-Layer technology developed by Minera Pudahuel in the ́80s (CL Patent 32025), as well as the Cuprochlor® process developed by Minera Michilla (CL Patent 45163), coming to the more recent “Heap leaching method” (US Patent WO2014030048A1) and the mixed version of the “Chloride method for bioleaching” patented by BHP Billiton (US Patent
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To ensure success of such heap leach processes, we comprehensively investigated aqueous chloride solution properties at high ionic strength, kinetics of copper extraction from chalcocite in chloride media, and mechanisms by which various factors influence leaching rate, in both acidified ferric and cupric chloride
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The announcement followed the release of results in December 2013 for a scoping study of the heap leaching and direct solvent extraction/electrowinning process to be used at the NiWest project. GME said the study confirmed the technical and potential economic viability for a project at NiWest that would produce 14,000 mt/y of nickel cathode and 540 mt/y of cobalt over a minimum 20-year mine life.
More
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