bioleaching of chalcopyrite, chalcocite, ... leaching and removing nutrients from the solution. ... ferrous/ferric ion ratios) in absence of
Ferric/ferrous sulphate leaching solutions tend to reach equilibrium when the activities of the two ions are equal. which requires a high input of energy to the system. 1975.
In this study, the co-bioleaching of chalcopyrite and silver-bearing bornite by mixed moderately thermophilic culture at 50 °C was investigated. The bioleaching results show that the extraction percentage of Cu for co-bioleaching of chalcopyrite (Ccp) and silver-bearing bornite (Bn) (Ccp/Bn = 3:1) was 94.6%.
Ferrous ion is then oxidized to ferric ion for recycling to the leaching step. ... Process for the rapid leaching of chalcopyrite in the absence of catalysts
A method of recovering copper from chalcopyrite concentrate by chemical leaching, using pyrite and silver. The catalytic properties of pyrite in the chalcopyrite leaching process are significantly enhanced by pretreating the pyrite with silver ions.
Chemical leaching of chalcopyrite with ferric ion The leaching of copper from sulphide ore bodies occurs naturally, releasing copper and iron. In ancient times, copper was recovered by cementation with metal iron and iron in the form of ferrous sulphate by evaporation of the solution.
Chalcopyrite Leaching in Acidic Chloride Solution without ... The effect of dissolved oxygen and ferrous/ferric/cu- ... ion concentration varied according to the ...
Chalcopyrite (bio)leaching processes include complex oxidationreduction reactions such as the oxidation of minerals, iron, and sulfur, and the hydrolysis of ferric iron. The pH behavior in chalcopyrite leaching solutions may be a
Leaching of chalcopyrite in cupric chloride solution ... leaching of chalcopyrite with ferric sulfate was the ... At cupric ion concentrations > 9 g/l the ...
LEACHING OF CHALCOPYRITE CONCENTRATE IN ... 2007), ferric ion (Al-Harahsheh et al., ... Leaching of chalcopyrite concentrate in hydrogen peroxide solution 659
In ferric chloride 80% of the copper was leached in two stages. The first was controlled by liquid ferric ion diffusion and ... Leaching of Bornite With Oxygen and ...
The chemical leaching of chalcopyrite was carried out to investigate the effects of temperature, ferrous ions and pH values on the leaching rate. The copper extraction of chalcopyrite attained 94% after 11 days when the initial pH value was 0.7 and the extraction temperature was 60 centigrade, while it was under 5% at pH 2.0.
Finally, the comparison between studies on chalcopyrite leaching is a difficult task because of differences in experimental conditions used. However, unlike at high temperature, chalcopyrite dissolution and ferric ion hydrolysis kinetics are very slow processes at low temperature (35 °C). 4. Conclusions1.
Ferric ion is a strong oxidizing agent that plays an important role in oxidation of sulﬁde ores. A few studies have been conducted on the leaching of pyrrhotite in ferric sulfate solution , although the direct effect of ferric ion on the oxidation of pyrrhotite tailings has not been systematically studied.
2.3. Chemical Leaching Experiments . To investigate the effect of ferric and ferrous iron as well as redox potential on the chemical leaching of Sarche- shmeh copper concentrate, four slurries with different initial redox potentials were prepared (Table 1) in 500 ml-Erlenmeyer flasks containing 200 ml suspension.
Akineticstudy of the leaching of pentlandite inacidic ferric sulphate solutions byI.J.CORRANS*,(Pr.Eng.).B.Sc.(Chem.Eng.)(Wits.).M.Se.(N.S.W.).Ph.D.(Natal)
Leaching experiments were conducted in 500 mL baffle-based Erlenmeyer flasks, and were designed to test sulfide mineral leaching rates, extents and products at different temperatures and ferric ion concentrations, as summarized in Table 3.
The utilization of chloride solutions in chalcopyrite leaching is advantageous due to the aggressive nature of the leaching and to the stability of cuprous ions due to the formation of the aforementioned chloro-complexes. With pHs
Author's personal copy Leaching of chalcopyrite with ferric ion. Part II: Effect of redox potential E.M. Córdobaa, J.A. Muñozb, M.L.
Resources and Sustainable Development III: The Influence of pH and Ferrous Ions on Chalcopyrite Dissolution in Chemical Leaching Chalcopyrite
Chemical leaching of chalcopyrite with ferric ion The leaching of copper from sulphide ore bodies occurs naturally, releasing copper and iron. In ancient times, copper was
This study was carried out to investigate the flotation and leaching behaviour of bornite and chalcopyrite when ... 2.7.4 Ferric ion leaching of Chalcopyrite in ...
PERCOLATION LEACHING OF A CHALCOPYRITE .BEARING ORE AT AMBIENT AND ELEVATED TEMPERATURES WITH BACTERIA By B. W. Madsen, 1 and R. D. Groves 2 ABSTRACT The Bureau of Mines conducted a large-scale (6.4 t), long-term (2,165 days) test to gain a better understanding of the leaching characteris tics of chalcopyritic ores.
and various additional Fe(III) ion concentrations as leaching agent. After 1300 hours of operation, the total copper recovery a value of 50 % in the most acidachieved ic
However, the leaching rate of chalcopyrite, an abundant copper mineral, is very low. To improve leaching rates, the factors affecting chalcopyrite leaching must be better understood. In the leaching, chalcopyrite is oxidized by ferric ions andror dissolved oxygen in sulfuric acid solution to extract cupric ions.
Various methods of controlling redox potential (ORP) with electrochemical bioreactor and others have been investigated to increase copper extraction of chalcopyrite in bioleaching,but less attention has been paid to reducing ferric to ferrous ions.
Sep 19, 1978· A process for hydrometallurgically recovering copper from concentrates of chalcopyrite and ... The ferric ion is then recycled to the leaching step ...
Read "Leaching of chalcopyrite with ferric ion. Part IV: The role of redox potential in the presence of mesophilic and thermophilic bacteria, Hydrometallurgy" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.
~30% with the use of pure oxygen. As indicated earlier, the regenerated ferric sulphate leaching of coppe r or zinc sulphides proceeds via a two-step process: the oxidation of the sulphide, leaching of the metal with the production of ferrous sulphate, followed by the regeneration of the ferric sulphate.
Keywords: chalcopyrite, pressure leaching, ... chalcopyrite concentrate in the presence of several species such as ferric ions, ferrous ions, cupric ions, ...
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 1971 (report of investigations 7474).
Cupric/cuprous ion ratio plays a vital role for leaching kinetics. Individually, ferric ... electrowinning of copper from chalcopyrite ... of integrated leaching ...
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Request PDF on ResearchGate Leaching of chalcopyrite with ferric ion. Part I: General aspects This paper presents a review of the literature on chalcopyrite leaching with ferric sulphate in acid medium.
by leaching the sulfidized chalcopyrite with solutions con-taining concentrations of chloride ions in the range 0 to 1 M. As can be seen in this figure, the extraction of copper is very small in the absence of chloride ions in the leaching solution, remaining below 10 pct even after 120 minutes of leaching time.
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Electrochemical Study of Oxygen Reduction Reaction on Natural Chalcopyrite in ... Chalcopyrite; Ferric ion ... the whole leaching rate of chalcopyrite
Leaching of chalcopyrite with ferric ion Part I: General , Chemical leaching of chalcopyrite with ferric ion The , the initial stage of leaching with ferric copper , concentrate using a ferric chloride leach . how to process the calcopyrite spskhanapurorgin.
This assumption appeared reasonable after 500 days of leaching where the ferric ion activity ... and chalcopyrite. The ferric ion ... Dump Leaching Copper. Previous ...
... research on the leaching of chalcopyrite with ferric ... Passivation of chalcopyrite during its chemical leaching with ferric ion at 68°C ...
Leaching of Bornite in Acidified Ferric Chloride Solutions ... chalcopyrite ... Fig. 6-- Effect of ferric ion concentration on stage-I leaching of bomite.
AbstractThe leaching of natural chalcopyrite was studied in both ferric chloride and ferric sulfate solutions. The morphology of leaching was studied by using a single chalcopyrite crystal and it appeared quite different with the two solutions.
ferric iron in these systems as well as the easiness of ferric ion regeneration. In addition, chalcopyrite leach-ing with ferric chloride shows faster kinetics than ferric sulphate solutions. These studies have also suggested that the sulphur formed as reaction product is more porous when leaching was carried out in the presence of chloride ions.
This paper presents a review of the literature on chalcopyrite leaching with ferric sulphate in acid medium. The effects of several parameters (ferric salt anion, oxidant concentration, pH and temperature) are examined and possible explanations are offered for the passivation of this sulphide during dissolution.
This thesis investigates the kinetics of cathodic ferric ion reduction on chalcopyrite and its influence on the leaching process in acidic iron sulfate solution, with an emphasis first placed on the development of a speciation model for the HSO-Fe(SO)-FeSO-HO system from 25°C-150°C.
Article citations. More>> Dutrizac, J. E., and MacDonald, R. J. C., 1974, Ferric Ion as a Leaching Medium, Minerals Sci. Engng., Vol 6, No 2, pp59-100.
The oxidative leaching of chalcopyrite in ... which can be readily oxidised to ferric, ... the dominant dissolved iron species is the ferrous tetra-ammine ion and ...
Abstract Carefully sized and characterized chalcopyrite concentrates were produced from eleven different geographical localities, and were subsequently leached in both ferric chloride-hydrochloric acid and ferric sulfate-sulfuric acid media.
The acid ferric sulfate leaching of chalcopyrite, CuFeS2 + 4Fe+3 = Cu+2 + 5Fe+2 + 2S0was studied using monosize particles in a well stirred reactor at ambient pressure and dilute solid phase...
chalcopyrite surface was observed to be free of surface deposit at high agitation speeds, possibly due to increased abrasion. Literature on iron chemistry in ammoniaammonium carbonate solutions is limited for the chalcopyrite leaching process, thus reference will be made to the Caron process.