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copper leaching acid

STUDIES ON THE CURING AND LEACHING KINETICS OF

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

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Valves for copper leaching

Heap leaching starts with the sprinkling of a low concentration sulfuric acid and water solution on a stockpile (leach pad) of low-grade ore. The liquid percolates through the stockpile and dissolves copper minerals, producing an approx. 60% copper concentration called pregnant leach solution (PLS).

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PRESSURE LEACHING OF DECOPPERIZED COPPER

copper extraction was achieved at leaching temperature of 99.85 C. The oxygen partial pressure range was chosen according to Weichert et al. (2013) who used the oxygen partial pressure of 5 bars. High sulfuric acid concentrations were selected to improve the process performance with the leaching

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Leaching of Lead and Copper by Citric Acid from Direct

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

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Acid Leachability Copper Species

methods employing sulfuric acid leaching. Several of these methods or variations of these methods are routinely used for oxide or acid soluble copper determinations at commercial laboratories in the western United States. Information regarding the dissolution behavior of a number of common copper

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Dissolution of copper from smelting slag by leaching in

Leaching of copper smelting slag in chloride media was studied. The lixiviants used were aqueous solutions of hydrochloric acid (0.5-2.0 M HCl) as well as hydrogen peroxide and hydrochloric acid (0.5-3.0 M H 2O2, 1.0 M HCl). The maximum final copper extraction from

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Cu Leaching Using Regenerated Ferric Sulphate

ies, regenerated ferric sulphate leach processes were proposed for copper sulphide minerals and for zinc sulphide minerals, whereby SO. 2 /O. 2. mixtures were used to regenerate ferric sul-phate, either in-situ (during the leach) or ex-situ (in a separate reactor). Initial results have been presented for copper and zinc sulphide minerals (19,20).

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Separation of cobalt, nickel, and copper metal using the

Aug 02, 2021Leaching experiments were carried out at 60 o C within 120 min with 500 rpm. Fig. 5 shows that Ni was fully leached at 75 g. L-1 pulp density. The leaching percentage of Co and Cu increased from 21.2 to 89.1% and from 2.6 to 16.0 % with the decrease of pulp density from 300 to 75 g. L-1. However, the leaching percentage of Co(II) in EG phase

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RECOVERY OF COPPER FROM COPPER SLAG AND COPPER

where the leaching of copper smelter slag with sulphuric acid (500 kg/Mg slag) resulted in copper and iron extractions of 20% and 52%, respectively, at 20oC, whereas the maximum copper and iron extractions were 60% and 90%, respectively, at 90oC. Also, based on the results depicted in Figure 2 and 3, it can be concluded that

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Leaching of copper oxide with different acid solutions

Oct 15, 2009Leaching processes of metallic copper or ores containing copper in the divalent state have been the subject of many research works in recent years,,,,. However, no study was found concerning the dissolution kinetics of CuO/Al2O3catalyst in inorganic or organic acid solutions.

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Leaching of Copper from Cuprous Oxide in Aerated Sulfuric

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

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PRESSURE LEACHING

Sunshine Mine process plant at Kellogg, Idaho (1980), but copper concentrate leaching was advanced to larger scales with the commissioning of the Bagdad, Arizona, concentrate leach plant (2003) and then the Morenci, Arizona, concentrate leach plant (2006). Copper concentrate leaching has been driven by two principal opportunities:

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SEPARATION OF COPPER FROM A LEACHING SOLUTION OF

Silvas et al. (2015) investigated copper leaching with sulfuric acid + hydrogen peroxide and 1:10 solid/liquid ratio at 75C over 4h. After two successive leaching stages, 100% of the copper in comminuted PCBs was leached. The separation of metals contained in a liquor from acid leaching can be achieved by a solvent extraction technique.

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A comprehensive study of the leaching behavior and

the increase in the leaching time and temperature enhanced the leaching rate of copper. The leaching rate increased up to a certain value with increasing the agitation rate, acid concentration, and liquid/solid ratio and, then, reduced with a further increment. Agitaion rate had the highest in uence on the dissolution of copper. The 3D response

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JP2014501849A

A copper oxide ore leaching method that does not utilize sulfuric acid, which comprises an aqueous solution of tricarboxylic acid mixed in water (the acidity in the mixture varies between pH 1.0 and 5.0). A step of impregnating the copper ore with an organic non-polluting leachate, a step of obtaining copper citrate, and optionally washing the impregnated copper ore again with an organic non

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Processes

Leaching offers an alternative to copper mining. First, the ore is treated with dilute sulphuric acid. This trickles slowly down through the ore, over a period of months, dissolving copper to form a weak solution of copper sulphate. The copper is then recovered by electrolysis. This process is known as SX-EW (solvent extraction/electrowinning).

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Project Description

Close down drilling after leaching had been terminated confirmed recovery of 87.5%. The average of incremental acid generated for typical heaps was 1.2 kg acid/kg Cu Leached, thus process solutions require neutralisation in commercial operations. Irrigation and aeration application rates proved to be effective controls on temperature.

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Copper Ore Hydrometallurgy and Pressure Leaching

Copper hydrometallurgy is a branch of metallurgy method to extract copper directly from those difficult-to-concentrate copper oxide ore. Traditional copper hydrometallurgy process typically consists of atmospheric leaching, solvent extraction (SX) and electro-winning (EW). It can produce either copper cathode or copper sulphate crystal.

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Copper Enrichment in Solid with Selective Reverse Leaching

Aug 17, 2020The figure showed that iron dissolution increased with increasing oxalic acid concentration at 3 M of H 2 O 2. It was also observed that, when the oxalic acid concentration was as low as 25 mg/L, the copper extraction in 5 min of leaching time was as high as 5.80%.

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US4039405A

This invention relates to a process whereby recovery of copper from copper ores using leaching and solvent extraction techniques can be increased. The process generally comprises leaching to obtain a pregnant leach liquor, washing ore residues with an extra quantity of water to obtain extra dissolved copper values, recovering said copper values, combining the extra wash water with the pregnant

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Leaching Process by Sulfuric Acid Reactions

May 27, 2020Sulfuric acid leaching of mineral rocks and concentrates containing titanium is a common method for the production of a pigment titanium dioxide. Presently, ways to intensify this leaching method are sought for using three activation methods: mechanical, thermal

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Acidic leaching of potentially toxic metals cadmium

A column leaching study, coupled with acid deposition simulation, was conducted to investigate the leaching of potentially toxic metals (PTM) from zinc smelting slag materials (SSM) after being incubated in an acid Alfisol for 120 days at room temperature. Two SSMs (SSM-A: acidic, 10 yrs exposure wi

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Copper Oxide Ore Leaching Ability and Cementation Behavior

Sulfuric Acid (H 2 SO 4) is the most common chemical reagent that is used for the leaching of oxide minerals including copper ones [5]. Among the most important factors of leaching are reagent type, temperature, time and pulp density [12] [13].

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US4115221A

A process for hydrometallurgically recovering copper from concentrates of chalcopyrite and other sulfide and mixed sulfide ores utilizes the pretreatment step of fine grinding of the concentrates coupled with subsequent leaching steps. As a pretreatment for the copper-containing concentrates, the concentrates are ground, preferrably with an attritor-type grinding device, to reduce the particle

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A Comparative Kinetic Study of Chalcopyrite Leaching Using

Methanesulfonic acid was proven to be an alternative lixiviant for copper leaching from chalcopyrite with hydrogen peroxide as an oxidant. Two alternative oxidants, dichromate and nitrate, were studied for the copper dissolution from chalcopyrite, a refractory copper sulfide mineral.

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Leaching of heavy metals from chromated copper arsenate

The amounts of leached chromium, copper and arsenic by sulfuric acid (pH 3) during 15 days were, respectively, 0.2, 0.14 and 0.15 mg more than leachates by nitric acid (pH 5) on the basis of 1g of wood (initial contents of 1.03 mg, 0.42 g and 0.8 mg per g of wood). Most of the leaching occurs in the first 5 days, and the rate of leaching

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Technical Overview August 2019

copper concentrations for an acid leaching operation are of the order of 1-2g copper (Cu)/L compared to PLS concentrations for the AmmLeach process of 6-12g Cu/L. This, coupled to the much greater copper transfer between aqueous and organic, allows the efficient handling of high copper tenors in PLS (in acid plants this would

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Outotec copper concentrate pressure leaching process

Jun 16, 2020Copper from is recovered by SX-EW. The client in this case has an existing heap leaching operation, and this was used to neutralize part of the PLS solution that contained acid. Leach residue from POX was fed to a conditioning stage where

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Treated Wood Fact Sheet

Copper may leach the most readily. Chromium may be the least likely to leach. 8 Other studies have shown that arsenic may leach more readily. 21,26,30 Copper and chromium tend to stick better to soils than arsenic, which tends to be more mobile. 4,21 CCA movement in soils can range from less than 6 inches to up to 8 feet from a structure. 29,31,32

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Acid ferric sulfate leaching of copper sulfide

BACKGROUND OF THE INVENTION. This invention relates to the field of acid ferric sulfate leaching of copper sulfide concentrates. Under certain circumstances, hydrometallurgical processing of copper sulfide concentrates offers significant technological advantages and capital cost savings over conventional smelting technology, including pollution control systems. Conventional hydrometallurgical

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Acid leaching of oxide–sulfide copper ore prior the

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

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Copper Mining and Extraction Sulfide Ores

This is scrubbed from the flue gases to make sulfuric acid for leaching copper from oxide ores. Scrubbing sulfur dioxide also protects the environment. For example: FeO(s) + SiO 2 (s)→ FeO.SiO 2 (slag) This is very similar to the removal of impurities in the blast furnace. The liquid left is a mixture of copper sulfides and iron sulfides.

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