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Chloride leaching offers significant advantages for copper hydrometallurgy including increased solubility increased rates of leaching and stabilization of Cu I through chloride complexation A mass balance was completed for both models and enabled the determination of recycle leach liquor concentrations of copper and iron species for the countercurrent leach testsChloride leaching offers significant advantages for copper hydrometallurgy including increased solubility increased rates of leaching and stabilization of Cu I through chloride complexation A mass balance was completed for both models and enabled the determination of recycle leach liquor concentrations of copper and iron species for the countercurrent leach tests
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Copper Leaching From Chalcopyrite Concentrate in Cu II Fe III Chloride System Free download as PDF File pdf Text File txt or read online for free Chalcopirita MásUniversity of Cape Town An Investigation into the Ferric Leaching of Chalcopyrite a Sub Process in the Bioleaching of Chalcopyrite by Elizabeth Geethika Jeevaratnam BSc Eng Chemical Dissertation prepared in partial fulfilment of the requirments for the degree
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A AHMADI 43 chemical leaching of chalcopyrite was increased 4 fold in the presence of 01 M ferrous iron compared with 01 M ferric iron Cordoba et al 8 studied the influence of ferric iron on chalcopyrite dissolution at low and high solution potentials and foundA AHMADI 43 chemical leaching of chalcopyrite was increased 4 fold in the presence of 01 M ferrous iron compared with 01 M ferric iron Cordoba et al 8 studied the influence of ferric iron on chalcopyrite dissolution at low and high solution potentials and found
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Leaching of chalcopyrite with ferric ion Part I General aspectsFerric chloride is a more effective reagent and this is attributable to the morphological characteristics of chalcopyrite leaching The kinetics with both leachant solutions were found to be linear over an extended period followed by an acceleration stage as a result of an increase in reaction surface area
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Cupric chloride and ferric chloride solutions have already proven to be efficient leaching agents ferrous chloride has been utilized for copper production by means of the Hunt and Douglas process Cupric/cuprous ion ratio plays a vital role for leaching kineticsAbstract A comparative study of electrochemical leaching and chemical leaching of chalcopyrite was done to elucidate the leaching mechanism of chalcopyrite with FeCl 3The leaching rate of chalcopyrite exhibits a half order dependency on the FeCl 3 concentration whereas it is independent of the FeCl 2 concentration concentration
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and sulfate ions Ferric ion results from the acidic leaching of any iron containing material It may be a minor problem as in leaching high grade chalcocite or a very major problem as in leaching chalcopyrite While ferric ion is not a major problem in basicFerric chloride is a more effective reagent and this is attributable to the morphological characteristics of chalcopyrite leaching The kinetics with both leachant solutions were found to be linear over an extended period followed by an acceleration stage as a result of an increase in reaction surface area
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Redox potential dependence of chalcopyrite leaching in acidic ferric chloride solutions NGUYEN Thi Phuong Thao Candidate for the Degree of Master Supervisor Prof Naoki Hiroyoshi Division of Sustainable Resources Engineering Introduction redox potential determined by the concentration ratio of Many chalcopyrite leaching studies have been performed with leachants such as ferric sulfate 4 7 ferric chloride 7 8 sodium nitrate sulfuric acid 9 hydrochloric acid 10 and sodium chloride sulfuric acid 11 among others 10 The slow copper from
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Leaching Chalcopyrite is the holy grail for hydrometallurgists Leachers difficult to leach as the sulfur forms a layer over the mineral and makes the leaching slow Having said that it is not 100 not leachable not unusual for ore dumps low grade containing chalcopyrite to be placed under leach but report low recovery / 30 TCu over several years and the rate is around 05 1 per month Cupric chloride and ferric chloride solutions have already proven to be efficient leaching agents ferrous chloride has been utilized for copper production by means of the Hunt and Douglas process Cupric/cuprous ion ratio plays a vital role for leaching kinetics
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In this process chalcopyrite concentrate is leached with ferric chloride solution to extract copper which is precipitated from the solution by electrolysis while leaving sulfur in the residue Spend liquor from electrolysis is treated with oxygen to regenerate the ferric chloride leach solution and the sulfur laden residue is processed to recover the sulfurA 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
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17/3/ 32 relation to galvanic interactions Leaching at 90 C in the presence of 01 M ferric ions in 01 M sulphuric acid provided the best results with 90 copper extraction from the mixtures in 6 hours Observed copper extractions suggested increased copper extractionAlthough the leaching efficiency of chalcopyrite was very low at ambient temperature the percentages of copper dissolved in the presence of hydrogen peroxide H2O2 and ferric sulfate Fe2 SO4 3
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A method to recover copper and elemental sulfur from chalcopyrite concentrate using a ferric chloride leach cufes2 3fecl3 >cucl 4fecl2 2s was reported by the federal Bureau of Mines in report of investigations Additional work has been done to Smelting of copper concentrates results in the discharge of millions of tons of SO to the atmosphere each year Because of increasing concern with air pollution the Bureau of Mines has developed a hydro metallurgical procedure to obtain elemental sulfur from chalcopyrite by means of the following reaction CuFeS 3FeCl→ CuCl 4FeCl 2S Under
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The effects of chloride ions on chalcopyrite leaching by biologically‐produced ferric sulfate solution and on the iron‐oxidizing culture were determined Chloride ions significantly increased chalcopyrite leaching by ferric sulfate at 67 176 C and 87 176 C but slowed down the leaching at 50 176 C At 90 176 C chloride at 5 g dm−3 025 g Cl− g−1 concentrate increased the copper yield from 11/12/ 32 DL Jones and E Peters “The Leaching of Chalcopyrite with Ferric Sulphate and Ferric Chloride ” in Extractive Metallurgy of Copper Vol II edited by JC Yannopoulos and JC Agarwal TMS AIME p 633 653 Google Scholar Download references
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chalcopyrite ferric leach experiments were conducted to obtain the redox potential range where chalcopyrite leaching occurs The rate of chalcopyrite leaching in a sulfate media decreases with time due to the formation of a passivating layer This hasA AHMADI 43 chemical leaching of chalcopyrite was increased 4 fold in the presence of 01 M ferrous iron compared with 01 M ferric iron Cordoba et al 8 studied the influence of ferric iron on chalcopyrite dissolution at low and high solution potentials and found
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