Chloride leaching for chalcopyrite - UBC Library Open ...

One mini-thickener was used for leach stage 1 (LSI) S-L separation in a smooth, clean and semi-continuous manner. The leach tests were performed using a chalcopyrite concentrate, from Antamina in northern Peru, which contained a low to moderate amount of gangue material.

QUANTITATIVE LEACHING OF A NIGERIAN CHALCOPYRITE …

conditions for leaching Nigerian chalcopyrite ore by nitric acid, aimed at predicting conditions for possible production of Cu(NO 3)2 was the focus of this investigation. The Cu(NO 3)2 is a valuable compound with varieties of application such as catalyst, textile …

Method of leaching of chalcopyrite - russianpatents.com

(57) Abstract: The invention can be used in metallurgy for the leaching of chalcopyrite with the purpose of extraction of copper. Method of leaching of chalcopyrite includes the processing of the leach solution of sulphate of iron (III) in the presence of dilute sulfuric acid in the absence of silver as a catalyst while maintaining the surface potential of chalcopyrite in the range 350-450 mV ...

Copper leaching from chalcopyrite concentrates | SpringerLink

Abstract. Chalcopyrite (CuFeS 2) is one of the most abundant copper-bearing minerals, which accounts for approximately 70 percent of the world's known copper reserves.For more than 30 years, a significant number of processes have been developed to leach copper from chalcopyrite concentrates.

Leaching of a Mongolian chalcopyrite concentrate ...

A Mongolian chalcopyrite flotation concentrate was leached using sodium hypochlorite adjusted to different pH using hydrochloric acid. It was found that using a starting pH of below 5.0 resulted in more efficient leaching. The extent of chalcopyrite leaching was determined by the concentration of sodium hypochlorite with > 40% dissolution being achieved.

Galvanic Leaching of Chalcopyrite in Atmospheric Pressure ...

Jun 09, 2010· Chalcopyrite leaching rate in atmospheric pressure and in sulfate media with ferric ion is low because of passive layer formation around chalcopyrite particles. In this investigation pyrite is used as a catalyst of chalcopyrite leaching. Because of galvanic interaction between chalcopyrite and pyrite, the chalcopyrite leaching rate is increased.

Pressure leaching of chalcopyrite concentrate: AIP ...

May 15, 2018· The results of chalcopyrite concentrate processing using low-temperature and high-temperature sulfuric acid pressure leaching are presented. A material of the following composition was used, 21.5 Cu, 0.1 Zn, 0.05 Pb, 0.04 Ni, 26.59 S, 24.52 Fe, 16.28 SiO 2 (in wt.%). The influence of technological parameters on the degree of copper and iron extraction into the leach solution was …

Minerals | Free Full-Text | Leaching of Chalcopyrite in ...

The leaching of copper from industrial copper ore with 4.8 wt % chalcopyrite by acidified nitrate with seawater based media was investigated. Water quality (pure water and seawater), temperature (25–70 °C), reagent concentration, and nitrate type (sodium and potassium) were studied variables.

Percolation Leaching of a Chalcopyrite-Bearing Ore at ...

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

Improvements in Ferric Chloride Leaching of Chalcopyrite ...

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). Additional work has been done to improve the recovery of sulfur ...

Study of chalcopyrite leaching from a copper concentrate ...

Chalcopyrite was leached at 20 °C in aqueous solutions of H 2 O 2 with and without ethylene glycol (EG). Without EG, the decomposition of H 2 O 2 was catalyzed by Fe 2 +, Fe 3 + and Cu 2 + ions (Fenton reagents).. EG was found to decrease peroxide decomposition, allowing leaching to continue.

The role of sodium chloride on surface properties of ...

The role of sodium chloride on surface properties of chalcopyrite leached with ferric sulphate M.F.C. Carneiro, V.A. Leão ⁎ Núcleo de Valorização de Materiais Minerais, Department of Metallurgical and Materials Engineering, Universidade Federal de Ouro Preto,

Chalcocite - Wikipedia

Chalcocite (UK: / ˈ k æ l k ə ˌ s aɪ t /), copper(I) sulfide (Cu 2 S), is an important copper ore mineral. It is opaque and dark-gray to black with a metallic luster.It has a hardness of 2 1 ⁄ 2 - 3 on the Mohs scale.It is a sulfide with an orthorhombic crystal system.. The term chalcocite comes from the alteration of the obsolete name chalcosine, from the Greek khalkos, meaning copper.

Acid and Oxidizing Leaching of Chalcopyrite Concentrate by ...

A hydrometallurgical treatment was applied to the Hajar Mine Copper Concentrate (HMCC), Morocco, containing ≈ 28.1% copper (the major copper mineral phase is chalcopyrite, CuFeS2), ≈ 26.1% iron, ≈ 5.8% zinc, ≈ 1.9% lead, ≈ 33.7% sulphur, and small amounts of silver (269 g/t) and nickel (219 g/t). Three acid media were used: ferric sulphate in sulfuric acid, ferric sulphate in ...

Characterization and Flotation of Sulfur from Chalcopyrite ...

The chalcopyrite leaching residue used in this study was produced from a chalcopyrite concentrate leaching similar to the leaching circuit of the Cuprex process [9]. The leaching conditions are: two-stage countercurrent leaching with 6 hours of retention time on each stage, leaching temperature of 95oC, and 2.0 moles per liter of ferric ...

Producing Copper Nature's Way: Bioleaching

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 ...

The leaching of chalcopyrite with ferric sulfate ...

The leaching kinetics of natural chalcopyrite crystals with ferric sulfate was studied. The morphology of the leached chalcopyrite and the electrochemical properties of chalcopyrite electrodes also were investigated. The leaching of chalcopyrite showed parabolic-like …

Enhancing the Leaching of Chalcopyrite Using ...

Chalcopyrite is the richest copper sulfide mineral in the world, but it is also the most resistant to biohydrometallurgical processing. To promote the bioleaching of chalcopyrite, a nonionic surfactant, t-octyl phenoxy polyethoxy ethanol (Triton X-100), was employed in this paper. Action of Triton X-100 in chalcopyrite leaching using Acidithiobacillus ferrooxidans was explored in shake flasks.

Chalcopyrite Leaching - Metallurgist & Mineral Processing ...

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 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 0.5-1% per month.

The Leaching of Chalcopyrite in Ferric Chloride and Ferric ...

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 chloride produced a porous elemental sulfur layer whereas ferric sulfate resulted in the formation and peeling-off of an aggregate of plate-like ...

(PDF) Mesophilic and thermophilic bioleaching of copper ...

The Fe3+-mediated chemical leaching system was found to be contaminated with microorganisms within a week at each temperature. data, mineral salts were in excess and could be optimized if used in and pyrite was also present. In the pyrite–chalcopyrite leaching system, large-scale bioleaching tests.

A mathematical model of the chemistry of the dump leaching ...

predictions of leaching performance would be made for the multi-year lifespan of a dump leaching operation. In the work presented here, the effects of various chemical factors on the dump leaching of chalcopyrite are considered. This is the rnost abundant copper sulfide mineral undergoing leaching (43) and is very difficult to leach.

Chalcopyrite - Wikipedia

Chalcopyrite is an accessory mineral in Kambalda type komatiitic nickel ore deposits, formed from an immiscible sulfide liquid in sulfide-saturated ultramafic lavas. In this environment chalcopyrite is formed by a sulfide liquid stripping copper from an immiscible silicate liquid. Occurrence. Chalcopyrite is the most important copper ore.