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leaching of chalcopyrite

Chalcopyrite Leaching - 911 Metallurgist

2017-5-5  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

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Leaching of chalcopyrite: An emphasis on effect of

2018-11-12  Many researchers found that the Fe2+ together with less amount of Cu2+ can accelerate the leaching of chalcopyrite. In this work, the leaching of chalcopyrite with Cu2+ was investigated. The leaching residuals were examined by Raman spectroscopy. Based on the leaching experiments, the chemical equilibrium in solution was calculated using Visual MINTEQ.

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Chloride leaching of chalcopyrite - ScienceDirect

2007-12-1  The leach conditions chosen for the 2 stage countercurrent leach experiments were based on literature investigations that indicated an atmospheric leach, near boiling point, at low pH, using relatively fine particles and high concentrations of chloride and copper(II) oxidant are important for effective and efficient leaching of chalcopyrite (Bonan et al., 1981, Dutrizac, 1981, Wilson and Fisher,

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Pressure leaching of chalcopyrite with oxalic acid and ...

2021-1-1  The chemical mechanism of chalcopyrite leaching is based on the oxidation of sulfur by oxygen. In addition to this, metal cations (Cu 2+, Fe 2+) react with the oxalic acid in the solution and form copper and iron oxalate complexes.

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Current scenario of chalcopyrite bioleaching: A review

2015-11-1  Bioleaching of chalcopyrite: Passivation phenomena and attempts for its reduction/elimination. Dissolution of chalcopyrite in acid solutions is an extremely slow process with its very low solubility in water (2.35 × 10 −6 mol/l at 110 °C) (Rossi, 1990). In the presence of bioleaching microorganisms, however, oxidation of chalcopyrite can be significantly enhanced.

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

leaching columns as used at ambient temperature. The column on the right coptained the chalcopyrite ore described in this report. eor tests conducted at elevated temperatures, the column was covered with 9 cm of fiberglass insulation to provide a uniform temperature in the column and reservoir. A covered fiberglass reservoir tank below the leaching column and a lid at the top of the ore column were used to minimize evaporation. Figure 2 shows the solution distribution system, which consisted of a rotating perforated arm. When the lid was used, the solution distribution system was changed to a perforated hose that sprayed solution evenly over the ore. The solution was collected in a reservoir at the bottom of the column and continuously recirculated to the top at a rate of 0.85 L/min. Water at pH 7 was initially used to wet the ore. As a result of recirculating the water for 36 days, the solution pH remained at 7 and no copper was extracted. The volume of the leach

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Enhanced leaching of copper from chalcopyrite in

2007-6-1  The chalcopyrite leaching by hydrogen peroxide can be summarized as (1) CuFeS 2 → Cu 2 + + Fe 2 + + 2 S 2 - (2) 2 S 2 - → 4 e - + 2 S 0 (3) 2 H 2 O 2 + 4 H + + 4 e - → 4 H 2 O In acidic environment, electrons are liberated as a result of chalcopyrite oxidation. Hydrogen peroxide is reduced to H 2 O, and elemental sulfur is formed.

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Optimization of sulfuric acid leaching of roasted ...

2020-8-26  Chalcopyrite (CuFeS 2) is commonly used ore in production of copper, but leaching of this ore is very slow and inefficient due to “passivation” during leaching at

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Catalytic effect of ethylene thiourea on the leaching of ...

2020-9-1  Chalcopyrite leaching in acidic ferric sulfate media was improved by addition of ethylene thiourea (ETU) in shaking flask tests with the iron-oxidizing bacterium acidithiobacillus ferrooxidans. In bioreactor experiments, ETU was able to solubilize the chalcopyrite even after the mineral was pre-leached under non-catalytic conditions.

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Effect of Ultrasound on the Oxidative Copper

Leaching of chalcopyrite in ferric sulfate media has several advantages: it is easy to handle, does not cause corrosion, is low cost, and copper recovery by solvent

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The leaching of chalcopyrite - UBC Library Open

The anodic dissolution of chalcopyrite has been examined in chloride and sulphate solutions from 20°C to 175°C. In chloride the yield of elemental sulphur is nearly 100%, whereas in sulphate solutions it is 75% or less, the remainder being oxidized. It is postulated that in sulphate solutions the copper dissolves as a thiosulphate complex, which can decompose either to a soluble form, or to ...

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LEACHING OF CHALCOPYRITE CONCENTRATE IN

Leaching of chalcopyrite concentrate in hydrogen peroxide solution 659 Material and methods Material Samples of the chalcopyrite concentrate were taken from the Menka Flotation Plant (Sivas, Turkey), where the CuFeS 2–PbS–ZnS complex ore is enriched.

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Thermophilic Bioheap Leaching of Chalcopyrite

2015-12-27  The chalcopyrite quickly becomes passivated and unacceptable copper extractions are achieved. It was not until the adoption of thermophilic systems that the biological leaching of chalcopyrite became a reality. There are several stirred tank processes currently being put forward for the biological extraction of copper from chalcopyrite including

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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. Leaching conditions were: 100 g ore/1 L solution; P80 of 62.5 micro;m; 400 rpm and leaching time ...

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Oxidative Leaching of Chalcopyrite by Cupric Ion in ...

2020-3-6  In this study, chalcopyrite concentrate produced in Sarcheshmeh copper plant was subjected to oxidative leaching investigation by cupric ion to determine the effect of several parameters on the copper and iron dissolution, including temperature of leaching, time of holding and cupric concentration as oxidant agent in a range of 38–97 °C, 1.5–8.5 h and 0.2–0.8 M, respectively.

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Sulfuric Acid-Oxygen Leaching for In-Situ Extraction of ...

2018-5-2  The Bureau of Mines is investigating in-situ leaching of chalcopyrite as a primary extraction technique. Two advantages make in-situ leaching an interesting possibility for treating deep chalcopyrite deposits. The first advantage is the increase

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An Investigation into the Ferric Leaching of Chalcopyrite ...

2021-1-24  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 has been described by many researchers as

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Optimization of sulfuric acid leaching of roasted ...

2020-8-26  Chalcopyrite (CuFeS2) is commonly used ore in production of copper, but leaching of this ore is very slow and inefficient due to “passivation” during leaching at atmospheric conditions. In this study, in order to overcome drawbacks of the

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Effect of Ultrasound on the Oxidative Copper

The objective of this study is to compare the reaction kinetics of copper leaching from chalcopyrite in acidic ferric sulfate media with (UAL) and without (non-UAL) ultrasound assistance. Four leaching parameters were evaluated and optimized. The parameter with the strongest effect was temperature, followed by ultrasonic power, the solid-to-liquid ratio (S/L), and acid concentration.

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LEACHING OF CHALCOPYRITE CONCENTRATE IN

Leaching of chalcopyrite concentrate in hydrogen peroxide solution 659 Material and methods Material Samples of the chalcopyrite concentrate were taken from the Menka Flotation Plant (Sivas, Turkey), where the CuFeS 2–PbS–ZnS complex ore is enriched.

More

Thermophilic Bioheap Leaching of Chalcopyrite

2015-12-27  The chalcopyrite quickly becomes passivated and unacceptable copper extractions are achieved. It was not until the adoption of thermophilic systems that the biological leaching of chalcopyrite became a reality. There are several stirred tank processes currently being put forward for the biological extraction of copper from chalcopyrite including

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An Investigation of Leaching Chalcopyrite Ore

The leaching time for a commercial operation was estimated from published data on laboratory column leaching of chalcopyrite ores and extrapolated to a commercial heap-leach by analogy with known leaching times for chalcocite ores. In commercial abiotic heap-leaches of chalcopyrite ore, the partial oxidation reactions generate insignificant ...

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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

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An Investigation into the Ferric Leaching of Chalcopyrite ...

2021-1-24  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 has been described by many researchers as

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Galvanic Leaching of Chalcopyrite in Atmospheric

2010-6-9  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.

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A kinetic study of the leaching of chalcopyrite at ...

A study of the rate of dissolution of chalcopyrite (CuFeS2) in acidic solutions under oxygen overpressures was carried out by measuring the rate of formation of cupric ions in solution. Effects of temperature, oxygen partial pressure, surface area, and concentration of sulfuric acid were evaluated. A sized batch of chalcopyrite was leached in the temperature range of 125 to 175° and in the ...

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Chalcopyrite leaching in ammonium chloride solutions ...

2021-7-9  Ammoniacal leaching solutions have been considered as an effective lixiviant for the oxidative dissolution of chalcopyrite. However, compared with the extensive studies of acidic chalcopyrite dissolution, the dissolution mechanism of chalcopyrite in ...

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Minerals Free Full-Text Control of the Redox

The leaching of chalcopyrite under different redox potentials was studied with a redox potential controlling device based on microcontroller . The leaching test was carried out in a 500 mL flask with 4 g pure chalcopyrite and 200 mL sulfuric acid. The additional total Fe concentration was 0.1 mol/kg, and the initial pH was 0.7.

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Agglomeration-aggregation and leaching properties of ...

The leaching results indicated that the mechanical activation can strongly enhance the reactivity of chalcopyrite and the hindering effect of aggregation on leaching was considerably greater than that of agglomeration. Consequently, after 8 h of milling, the maximum Cu leaching rate of 80.13% was achieved after 4 h of acid leaching.

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