Sulfuric acid concentration, leaching time, leaching temperature and oxidant addition had important effects on zinc and copper extraction from the alkali leaching residues. 97.23% Zn and 96.48% Cu were extracted under the optimum parameters as follows: a sulfuric acid concentration of 180 g·L −1, a leaching time of 1 h, a leaching ...
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Copper Leaching Process: Involves stages like crushing, heap formation, and solution application to extract copper using solvents like sulfuric acid, particularly from low-grade ores. Leaching Process Example : Commonly used in mining and other fields like pharmaceuticals; exemplified by gold extraction using cyanide resulting in soluble complexes.
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The flowsheet discussed in this study is for treatment of 100 tons per day oxide-sulfide copper ore by the leaching process using sulfuric acid-ferric sulfate solvent. This flowsheet would also be suitable for a larger tonnage by …
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The influence of NaNO 3 concentration on the copper leaching degree was determined in a NaNO 3 concentration range from 0.15 to 0.60 mol dm −3 and a time frame from 3 to 30 min. The other experimental conditions were constant (80 °C, 1.0 mol dm −3 H 2 SO 4, stirring speed 300 min −1 and phase ratio 20 g Cu 2 S/1.2 dm 3).The effect of changing the …
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Until recently, conventional acid-leaching of copper was utilized as a means of recovering copper from low-grade materials such as waste rock and flotation tailings and was conducted in dumps that were already in place. At least five factors have impeded the acceptance of leaching as a major commercial process: ... Sulfuric acid is in short ...
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Meanwhile, the Copper leaching with sulfuric acid from solid waste (e.g. flash furnace dust (Rios et al., 2021), copper smelting slag (Shi et al., 2020)) have been researched widely. Therefore, to extract the copper effectively and obtain high quality iron concentrate from the PyC simultaneously, a novel process was proposed in this work, which ...
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The highest copper leaching efficiencies were obtained for the highest sulfuric acid concentration (200 g/l) and the next stage of the research was started with the assumption that a solution of this concentration should be used. 3.2 Effect of …
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Santos subsequently employed a Doehlert experimental design to optimize the leaching process, identifying ideal parameters: 9.8% H 2 SO 4 (w / w) (1M of sulfuric acid), 10 h of leaching, 0.1 g of tailings, 10 mL of solution, and 100 RPM agitation, achieving a remarkable 95.5% manganese recovery.
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The magnesium sulfate and part of the iron sulfate were produced from the reaction of clinochlore with sulfuric acid while the copper sulfate was probably produced by the reaction of copper oxide with sulfuric acid. After leaching and washing, the six new peaks and the peaks belonging to gypsum disappeared, indicating these three species ...
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The use of this biochemical method in the copper leaching process resulted in a significant reduction in sulfuric acid consumption, by 40%, and a copper recovery rate of …
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To investigate the effect of sulfuric acid dosage on the leaching rate of elements from copper slag, experiments were conducted while controlling other curing conditions (curing temperature of 200°C, curing time of 2 h, and water addition at 20 % of the dry mass of copper slag). ... Cured material (mixture of copper slag and sulfuric acid), (b ...
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Sulfuric acid concentration is the key factor in the leaching of copper. The effect of sulfuric acid concentration on the leaching of copper was explored under the conditions of the particle size −45 + 38 μm, leaching temperature of 333 K, L/S ratio of 8 mL/g and H 2 O 2 added amount of 600 mL/kg, the results are shown in Fig. 3 (c).
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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 "pregnant" leach solution of sulfuric acid and copper sulfate is collected in a small pool. The copper compound can now be seen at ...
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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.
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In this research, a hydrometallurgical method for recovery of copper from copper rich converter slag is investigated. The main copper containing phases of the slag are cuprite (Cu2O), …
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Similar to copper oxide heap leaching, also using dilute sulfuric acid. The final product is yellowcake ((U_3O_8)) and requires significant further processing to produce fuel-grade feed. Acid leaching is sometimes also referred to as heap …
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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+ …
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The leaching rate of copper and iron or silicon was 97% and less than 2% respectively when copper slag is treated by oxygen pressure acid leaching process, which can achieve the purpose of limiting the leaching of Si and Fe while highly selective leaching of valuable metals under low acidity and energy consumption conditions [12], [13], [14], [15].
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The chemical leaching columns were subject to diluted sulfuric acid conditioning at a feeding rate of 5 L/h·m 2 in closed circuit for 24 h until reaching pH 1.4 in the effluent. Later, columns were fed with diluted sulfuric acid solution pH 1.4 with 10, 20, 50 and 100 g chloride/L (added as NaCl) in
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The dissolution of carbonate gangue minerals, which are often ubiquitous in copper deposits, leads to the consumption of large amounts of acid during the leaching of such ores, which can make the process uneconomical (Habashi, 1970, Habashi, 1980, You-Cai et al., 2013).Table 1 shows the acid consumption and estimated time to complete the dissolution of …
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Sulfuric acid–oxygen pressure leaching of white metal was investigated at laboratory scale as an alternative to the pyrometallurgical Peirce–Smith converting to produce metallic copper.
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About 91% copper content was leached in 13% sul-phuric acid concentration, stirring rate of 600 rpm, liquid/solid ratio of 10 mL/g, and 50 C after 80 min leaching. The dissolution kinetics was …
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The sulphuric acid was found to be effective in recovering copper from chalcopyrite with efficiencies of 72 to 93 % for 75 micron particle size and 65 to 84% for the 212 micron sieve …
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kinetics of a Cu-Co ore in the sulfuric acid and hydrogen peroxide system followed the shrinking core model, of which the controlling factor is the diffusion of the reac-tants through a product layer. Wang et al. [29] applied the sulfuric acid leaching process to recover the copper from the otation tailings and showed that under optimal
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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 ... copper leaching was first enhanced and then decreased with increasing H O concentration, and the leaching efficiency reached a maximum of 99.47% at 2.0 mol/L H 2 O 2. As a strong
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Sulfuric acid (1.14 M made from reagent grade stock) was added at a rate of 40 microliters per minute using a syringe pump. The pH was monitored using a pH electrode throughout the course of leaching. Copper extraction was measured using a copper ion selective electrode. Data from the pH probe and copper ion selective electrode were recorded
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The suggested optimal conditions for copper leaching from complex sulfide ores involve a grinding time of 5 h, sulfuric acid concentration of 0.5 M, chloride concentration of 0.5 M (deionized water to wastewater volume ratio of 1:1), liquid to solid ratio of 40 mL/g, stirring speed of 400 rpm, leaching time of 4 h and leaching temperature of 80 ...
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exception of chrysocola, leaching behavior of copper-bearing minerals under ferric-iron/sulfuric acid leaching is generally closely modelled by dissolution with sodium cyanide of assay-type …
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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 ...
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Copper oxide ore; Leaching behavior; Recovery; Kinetics; Shrinking core model; Optimization. Abstract. The leaching behavior of an Iranian copper oxide ore in sulphuric acid was investigated in detail to evaluate the in uence of various factors, to optimize the dissolution conditions, and to determine the kinetics of the leaching. The results ...
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Traditional copper extraction typically involves leaching with sulfuric acid (H 2 SO 4) as a lixiviant. Copper oxides dissolve easily in a diluted sulfuric acid solution, but primary refractory sulfides necessitate high temperatures and pressures, and secondary sulfides require additional oxidants [4] for effective dissolution. Addressing the ...
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The beneficial effect of chloride on sulfide leaching in sulfuric acid has been widely reported over the last 3–4 decades but the reasons have not been resolved. A review of recent literature shows that sulfide leaching is complex due to alternative reaction paths, competitive reactions and interim compounds formed on solid surfaces or in ...
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Two-stage leaching and evaporation were applied to extract and purify copper from copper-contaminated sludge: (i) in the first stage, 2.0 N sulfuric acid could leach out 95.2% Cu and other impurities (Fe, Al, and Pb); (ii) in the second stage, an ammonia solution was used to stabilize Cu by forming an amine complex in solution, while other ...
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Sulfuric acid leaching of lead smelter mattes resulted in the recovery of about 45 pct of the nickel and cobalt and 10 to 45 pct of the copper. The addition of manganese dioxide increased the cobalt and nickel recovery from 45 pct to greater than 90 pct, and increased the copper from 10 to 45 pct to nearly 100 pct recovery. ... The procedure ...
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The flowsheet discussed in this study is for treatment of 100 tons per day oxide-sulfide copper ore by the leaching process using sulfuric acid …
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When the sulfuric acid concentration is more than 150 g/L, the ascent of the leaching efficiency gradually slowed down. In general, the amount of sulfuric acid per unit volume increases with the increase of sulfuric acid concentration, resulting in that copper in the unit mass of anode slime reacts with more sulfuric acid [27]. The reaction ...
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