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Acid Leaching Copper Ore Treatment Method

2017-5-23  The barren solution is held in the agitator until the copper cement settles and is then transferred to the barren solution tank. The copper cement can be removed at the end of each cycle or after several cycles of operation. ACID SUPPLY. The source of sulphuric acid for leaching

Sulfuric acid leaching for capturing value from copper

2019-4-1  The acid consumption of the optimized leaching process was found to be 23.7 mol of H2 SO 4 per kg of copper.

Soil Washing: Optimization of Acid Leaching of Copper

2013-10-31  Soil Washing: Optimization of Acid Leaching of Copper from Contaminated Soil Master of Science Thesis in the Master Degree Programme, Chemistry and Bioscience ANNA ERIKSSON PER JOHANSSON Department of Civil and Environmental Engineering Water Environment Technology CHALMERS UNIVERSITY OF TECHNOLOGY Gothenburg, Sweden, 2013 Report no. 2013:32

Accelerating Copper Leaching from Sulfide Ores in

Arias [ 37] developed a process for leaching copper sulfide ore in heaps with an acid-nitrate media. Hard [ 38] patented a copper leaching process using sulfuric acid in the presence of nitrate ions. The optimal pH range (0.5 and 1.5), nitrate concentration (1–10%) and ratio between H + and NO 3− ions (ratio of 4 to 1) have been determined.

Leaching of iron from copper tailings by sulfuric acid

The leaching of copper tailings in the sulfuric acid solution may involve the reactions shown in eqn (5)– (10). 11,24,25 The Gibbs free energy (Δ G °) is calculated to be −101.81 kJ mol −1 for Fe 3 O 4, −203.58 kJ mol −1 for Fe 2 SiO 4, −265.06 kJ mol −1 for CaO, −114.65 kJ mol −1 for CuO, −131.22 kJ mol −1 for ZnO, and −399.03 kJ mol −1 for CuS, implying that metallic oxide can be directly leached under acidic condition, while oxidation is necessary for the leaching

A-Z of Copper Ore Leaching ALTA Metallurgical Services

2021-3-26  chalcocite partially leachable in sulphuric acid. leachability increases with temperature and with acid stength (eg. acid cure). native copper slow leaching in sulphuric acid at atmospheric temperature. kinetics improve when agitated with aerated hot strong acid. chalcocite covellite bornite leachable with sulphuric acid/ferric sulphate solutions.

Nitric Acid Leaching of Copper-Zinc Sulfide Middlings

2016-5-16  Research has been carried out for nitric acid leaching of copper-zinc sulfide middlings that are difficult to concentrate for development of combined processing

LEACHING OF LOW-GRADE COPPER ORES: A CASE

2017-6-9  leaching methods. Agents for leaching copper can be acid, base, or salt solutions. Of all of these agents, sulphuric acid has been given the broadest industrial application in hydrometallurgy of copper. The basic copper carbonate minerals, which are easily leached with the solution of sulphuric acid are: azurite, malachite and chrysocolla.

Leaching of copper concentrates University of Arizona

2020-4-2  Copper recoveries of 94 per cent in thirty minutes and 99 per cent in sixty minutes were obtained with material of average size 3.8 microns, a temperature of 106°C, and a ferric chloride concentration of 428 grams per liter. Essentially all the reacted sulfide reported as elemental sulfur. 10.

Understanding Acid Consumption and Its Relationship

2016-8-11  Acid consumption in copper heap leaching is determined by theminerals present in the ore. Gangue minerals such as biotite andchlorite consume acid together with copper-bearing minerals such aschrysocolla and malachite. Acid consumption is affected by the rate ofacid application and the particle size. Some gangue minerals undergoalterationsand causeprecipitate formationduring acid leaching.

Leaching of Copper from Cuprous Oxide in Aerated

The leaching ef˜ciency of copper was reported to be about 50% in the case of leaching in sulfuric acid solution without other oxidants7–9). Although Sullivan and Oldright7 ) and Majima et al.9 observed that the intro-duction of oxygen or air enhanced the leaching ef˜ciency of copper by employing single experimental set without further

Accelerating Copper Leaching from Sulfide Ores in

This work investigates the effect of an agglomeration and curing pretreatment on leaching of a copper sulfide ore, mainly chalcopyrite, using mini-columns in acid-nitrate-chloride media. Ten pretreatment tests were conducted to evaluate different variables, namely the addition of nitrate as NaNO3 (11.7 and 23.3 kg/ton), chloride as NaCl (2.1 and 19.8 kg/ton), curing time (20 and 30 days) and

Leaching of iron from copper tailings by sulfuric acid

Each sulfuric acid leaching experiments of copper tailings was repeated three times, and the average value of these three values was used to reported to avoid any errors. ThemetalionleachingrateforFe 2+,Ca,Zn2+,Cu andSi4+ was calculated using eqn (1). X ¼ C aV w sm 100% (1) where X is the leaching rate of the target metal, %; C a is the ion

Acid leaching of oxide–sulfide copper ore prior the

2015-11-26  453 Acid leaching of oxide–sulfide copper ore prior the flotation A way for an increased metal recovery Miroslav D. Sokić1, Vladan D. Milošević1, Velizar D. Stanković2, Vladislav Lj.Matković1, Branislav R. Marković1 1Institute for Technology of Nuclear and Other Mineral Raw Materials, Belgrade, Serbia 2University of Belgrade, Technical Faculty, Bor, Serbia

Leaching of Lead and Copper by Citric Acid from Direct-to

2019-9-4  Keywords: blister copper, flash smelting slag, citric acid, lead recovery, leaching 1. Introduction As a result of melting of copper concentrates in direct-to-blister flash smelting furnace, a slag with a significant copper content (12-16%) is obtained as one of the products. This is 25-30% of copper fed from the concentrate.

Metals Recovery: Study of the Kinetic Aspects of Copper

2020-1-3  kinetic constants during the leaching processes in different acid leaching media (Dutta at al., 2018; Ha et al., 2014; Kim et al., 2011). According to the literature (Havlik, 2008), a thermodynamic study of the leaching process of copper indicates that it is possible to use an acid oxidizing medium for leaching. However, these

STUDIES ON THE CURING AND LEACHING KINETICS OF

2017-5-27  existing mathematical models of heap leaching. Sulfuric acid curing is a pretreatment to accelerate the extraction kinetics of copper ores and is widely used in copper operations. The curing process involves the addition of a highly concentrated sulfuric acid to the copper ore during agglomeration. Then, chemical reactions already begin prior to

Leaching of Copper Sulphides SAIMM

2016-6-8  leaching step and that produced in the extraction of copper from the pregnant leach solution (PLS) is available for use in a copper heap leaching unit process. In this way, an acid credit to the operating cost is derived (Dreisinger, 2006). Secondly, it is

Two-stage leaching of zinc and copper from arsenic

2019-8-1  The calculated leaching rates of zinc and copper were 98.4% and 96.01% in the acid leaching residues containing 0.64% zinc and 0.41% copper respectively. 99.58% lead and 98.93% bismuth remained in the acid leaching residues can be returned to pyrometallurgical processes for recovery.

Microwave assisted leaching investigation for the

2020-8-1  Conventional leaching of copper and chromium using H 2 SO 4. The leaching behavior of copper and chromium from spent catalyst was investigated in the function of time (60–360 min), agitation speed (200–1000 rpm), H 2 SO 4 concentration (0.5–2.0 M), particle size (45–53 μm to 106–150 μm), pulp density (1–3%) and temperature (298

Acid leaching of copper ore heap with fluoroaliphatic

Such aqueous acid leaching typically utilizes an aqueous solution of dilute sulfuric acid ("leachant"), which leaches, or dissolves, the copper from the ore. The aqueous acid leachant is typically sprayed on top of the heap or dump and allowed to percolate, or trickle, down by gravity between the ore pieces.

Acid leaching of oxide–sulfide copper ore prior the

2015-11-26  453 Acid leaching of oxide–sulfide copper ore prior the flotation A way for an increased metal recovery Miroslav D. Sokić1, Vladan D. Milošević1, Velizar D. Stanković2, Vladislav Lj.Matković1, Branislav R. Marković1 1Institute for Technology of Nuclear and Other Mineral Raw Materials, Belgrade, Serbia 2University of Belgrade, Technical Faculty, Bor, Serbia

Sulfuric acid injection in copper heap leaching LEWA

The leaching reagent (dilute sulfuric acid) is sprayed through sprinklers on top of the heap pile and allowed to trickle down through the heap, where it dissolves the copper from the ore. The resulting solution of sulfuric acid and copper sulfate is collected in a small pool. Copper concentration is around 65%. Next step is solvent extraction.

Selective leaching process for the recovery of copper

A selective acid leaching process was then used to recover the copper content of the residue after filtration. In the second stage, an additional 1 N of sulphuric acid was added to the suspension in the selective leaching process, and the pH value was controlled at 1.5-2.0. The reagent sodium hydroxide (2 N) was used as leachate at a pH greater

Metals Recovery: Study of the Kinetic Aspects of Copper

2020-1-3  kinetic constants during the leaching processes in different acid leaching media (Dutta at al., 2018; Ha et al., 2014; Kim et al., 2011). According to the literature (Havlik, 2008), a thermodynamic study of the leaching process of copper indicates that it is possible to use an acid oxidizing medium for leaching. However, these

Improvement of Copper Metal Leaching in Sulfuric Acid

2020-5-28  A new concept for copper (Cu) metal leaching by the simultaneous use of cupric ions (Cu2+) and oxygen (O2) was proposed to improve Cu metal leaching in sulfuric acid. According to this concept, Cu2+ oxidizes Cu metal into cuprous ion (Cu+), and

Leaching of Copper Sulphides SAIMM

2016-6-8  leaching step and that produced in the extraction of copper from the pregnant leach solution (PLS) is available for use in a copper heap leaching unit process. In this way, an acid credit to the operating cost is derived (Dreisinger, 2006). Secondly, it is

Leaching process for copper concentrates The

Preferably, at least 1.5 moles of sulphuric acid are added for every mole of copper recovered and more preferably at least 2 moles of sulphuric acid are added for every mole of copper. Higher levels of sulphuric acid in solution generally enhance the leach kinetics. EXAMPLES . Leaching reactions were carried out at atmospheric pressure on a

INVESTIGATION OF COPPER(I) SULPHIDE LEACHING IN

2019-11-19  leachant for copper sulphides and the advantages of using mixed chloride-sulphate acid leachants for chalcocite-type minerals were recognised. Cho [8] investigated leaching of chalcocite in hypochlorous acid and found that the leaching rate was pH dependent. The Broken Hill Associated Smelters (BHAS) in Port Pirie, South Australia [9], developed a

Analysis of the effects of changes in operating conditions

2013-8-20  Component Leaching reaction Rate expression Copper (2) (4) Iron (5) (6) A sensitivity analysis was performed to observe the effects of changes in the concentration of acid on the rate of copper leaching. The acid concentration was varied from