آخرین محصولات
Innovations: How Hydrometallurgy and the SX/EW Process Made
Beginning in the mid 1980s a new technology, commonly known as the leach-solvent extraction-electrowinning process or, SX/EW Process, was widely adopted. This new copper technology utilizes smelter acid to produce copper from oxidized ores and mine wastes. Today, worldwide, approximately 20% of all copper produced is produced by …
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Optimizing the Leaching Parameters and Studying the Kinetics of Copper
The study of copper (Cu) recovery is crucial for the entire recovery process of waste printed circuit boards (WPCBs), and Cu can be leached efficiently via a sulfuric acid–hydrogen peroxide (H 2 SO 4 –H 2 O 2) system.To achieve high Cu recovery, it is important to evaluate the parameters of the leaching process and understand the Cu …
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COPPER HYDROMETALLURGY AND EXTRACTION …
by ZENECA for copper recovery from concentrated chloride solutions obtained by concentrate leaching with ferric chloride.4 The extraction can be described by the following equation. CuCl2 w + 2LO = CuCl2L2 o 0 4) However, at high copper loading the formation of 1:1 copper ligand complex is probably formed as in the case of octyl nicotiniate.
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Copper Mining and Processing: Processing Copper Ores
This process uses a series of physical steps and high temperatures to extract and purify copper from copper sulfide ores, in four basic steps: 1) froth flotation, 2) thickening, 3) smelting, and 4) electrolysis. Following mining, transporting, and crushing to a consistent gravel or golf ball-size, the crushed ore is further processed at a mill ...
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LixTRA™ – Novel Copper Leach Technology
Days of Leaching 80 70 60 50 40 30 20 5 10 15 20 25 30 Copper Leached (%) Fig. 1a: Industrial Column Leaching – Oxide Ore Leach time is 70% of control 34% more copper leached 28ppm LixTRA™ Control Results From Figure 1 (a-d) the beneficial effect of using LixTRA™ can be observed when leaching; a) an oxide ore b) a secondary
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Copper Leaching Method
Extraction of copper from suitable ore by leaching methods is generally assumed to cost less than the combined expense of concentration, smelting, and refining, and experimental data tend to confirm this opinion. At the Butte-Duluth plant, which is handling in excess of 100 tons of oxidized ore daily, the copper is said to cost $0.085 per …
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Understanding gangue acid consumption in copper sulfide heap leaching
A geometallurgical model, linked to simple ore body characteristics, was established to understand short- and long-term gangue acid consumption (GAC) variability for a new copper sulfide chemical heap leaching process under standard metallurgical conditions, including an acid dose of 12 kg/t sulfuric acid during agglomeration at a …
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Leaching of iron from copper tailings by sulfuric acid: behavior
2.2. Instruments and procedure Fig. 1 shows the set-up used to study the leaching process of copper tailings. The experiments were performed according to the following procedure. First, 200 mL of the leaching agent was prepared using H 2 SO 4 and deionized water, and poured into a three-necked round-bottom flask. The leaching agent was heated to the …
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Leaching of copper (I) sulphide by sulphuric acid solution with
From Fig. 1, it can be concluded that acid medium favours the formation of elemental sulphur, S 2− ions which exist only under very high pH values and strong reduction condition; copper leaching from Cu 2 S and CuS necessitates oxidation conditions. At higher pH values and under oxidation conditions, Cu 2 O and CuO exist in …
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Kinetics of copper leaching from direct-to-blister copper flash
The influence of a number of leaching parameters such as sulfuric acid concentration, amount of H 2 O 2 added, liquid to solid phase (l/s) parameter and process temperature on the copper leaching efficiency was investigated. Under optimized process conditions, 95.6% of the copper contained in the original sample of slag was transferred …
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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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Effect of temperature, oxygen partial pressure and calcium
The effects of leaching temperature, oxygen partial pressure, and calcium lignosulphonate, on copper extraction and iron extraction of chalcopyrite pressure leaching were investigated. The leaching rate is accelerated by increasing the leaching temperature from 120 to 150 °C and increasing oxygen partial pressure to 0.7 MPa.
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Sulfuric Acid
Sulfuric acid (H 2 SO 4) is a strong acid. It is an odorless, clear to dark brown, oily liquid that is corrosive. Sulfuric acid has many industrial purposes and is produced in greater quantities than any other chemical worldwide. In metal mining, sulfuric acid is used to leach copper oxide minerals. In one process, a solution of sulfuric acid laden
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LixTRA™ – Novel Copper Leach Technology
A heap leach encompasses a level of comminution while a dump leach is run of mine (ROM), where the ore is moved directly from mining to lixiviation. In the copper industry, irrigation takes place whereby a lixiviant (dilute sulfuric acid) is sprayed over the ore and …
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Minerals | Free Full-Text | Acid-Gangue Interactions in …
Heap leaching accounts for a fifth of global copper production, sourced primarily from porphyry ores, yet metal recoveries are often not optimal. Gangue, and its interaction with acid, plays an …
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LEACHING OF COPPER CONCENTRATES
copper oxides have been in common use for some time. Prior to the development of the Sherritt-Gordon process for nickel and cobalt in which copper is recovered as high grade copper sulfide, copper sulfides were economically recovered in a hydrometallurgical process only during the leaching of waste dumps. . Need for Hydrometallurgical Processes
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Optimization of sulfuric acid leaching of roasted chalcopyrite
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 passivation layers, the concentrate supplied from Eti Bakır A.Ş. Küre Plant in Turkey was roasted at …
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Improvement of Copper Metal Leaching in Sulfuric Acid Solution …
The leaching process of copper metal in sulfuric acid solution with both Cu 2+ and O 2 was proposed to avoid the use of nitric acid or hydrochloric acid and the addition of oxidants such as Fe 3+ for copper metal leaching. The leaching of Cu metal was enhanced by adding Cu 2+ ions and introducing O 2 2+ at 400 rpm with 1% pulp …
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Rio Tinto's Nuton ready to leverage its leaching R&D legacy
More than a few companies and technology providers claim to have solved the primary copper sulphide leaching conundrum, but only one has close to 30 years of R&D and the Rio Tinto name behind it. Rio, through its Nuton venture, is the latest to table a solution to treat primary copper sulphides such as chalcopyrite, having introduced the ...
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Leaching of copper oxide with different acid solutions
Plots of 1 − (1 − x) 1/3 vs. leaching time at different temperatures for the dissolution reactions of copper with H 2 SO 4 (a), HCl (b), HNO 3 (c) and citric acid (d) solutions.
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Metals | Free Full-Text | Leaching of Copper from Waste-Printed …
In the present paper, the leaching of copper from printed circuit boards (PCBs) using sulfuric acid with Cu 2+ and O 2 is proposed. The effects of various process parameters such as agitation speed, temperature, the type and the flow rate of gas, initial Cu 2+ concentration, and pulp density were investigated to examine the dissolution behavior …
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UNDERSTANDING ACID CONSUMPTION AND ITS …
data for copper recovery from an associated copper ore. INTRODUCTION Acid consumption during copper leaching of oxide ores is a very important issue. Acid consumption can determine whether or not a project is economically and technically feasible. The cost of supplying acid to a leaching operation is closely tied to the acid …
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Sulfuric acid leaching for capturing value from copper rich …
Sulfuric acid leaching of copper rich slag with the optimized parameters can provide a copper rich process solution with iron as the main impurity metal. The solution can provide an attractive feed for integration into the industrial primary copper production with acceptable low Ni, As and Pb levels (43.6 g/L Cu, 9.4 g/L Fe, 0.3 g/L Ni, 0.1 g/L ...
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Effective Recovery Process of Copper from Waste Printed
This study presents an optimized leaching and electrowinning process for the recovery of copper from waste printed circuit boards including studies of chemical consumption and recirculation of leachate. Optimization of leaching was performed using response surface methodology in diluted sulfuric acid and hydrogen peroxide media. …
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Leaching kinetics and predictive models for elements
However, it was noticed that the copper leaching began to reach equilibrium state at 60 min so is iron leaching whilst at the same equilibrium time interval cobalt dissolution continued to rise. Conclusion. The progress of reactions between copper, cobalt and iron in copper oxide ore and sulphuric acid under different reaction conditions was ...
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Process improvement and kinetic study on copper leaching …
Abstract: Process improvement and kinetic study on copper leaching from low-grade cuprite ores in sulfuric acid solution are presented in this paper. Effects of major leaching parameters on copper leaching efficiency are determined. The results indicate that copper minerals in the raw ores are mainly cuprites.
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Copper Mineral Leaching Mathematical Models—A Review
At an industrial scale, the main efforts have focused on the acid leaching of copper oxides, uranium minerals and cyanide leaching of gold minerals, and lately, leaching copper sulfide minerals by H 2 SO 4 + chlorides. The mineral leaching process was developed by many authors, modeling the process mainly applied on an industrial scale of ...
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Improvement of Copper Metal Leaching in Sulfuric Acid Solution …
The influence of a number of leaching parameters such as sulfuric acid concentration, amount of H 2 O 2 added, liquid to solid phase (l/s) parameter and process temperature on the copper leaching ...
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(PDF) Leaching kinetics and predictive models for
The results of experimental investigation on the study of leaching kinetics of copper oxide ore in sulphuric acid solution were discussed. The effect of time, pH, stirring speed and temperature on ...
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Copper Mineral Leaching Mathematical Models A Review
future directions of the copper leaching modeling are presented in Section4. 2. Leaching Process 2.1. Overview and Industrial Applications ... acid (H2SO4), known as the curing process, aiming to begin the copper sulfation process in the oxidized minerals or sulfated minerals (cured with mixed sulfuric acid and chlorides
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