In this paper, the kinetics and mechanism of copper bio-leaching from the low grade ore by A. ferrooxidans is reported. 2. Materials and methods . Lean grade copper ore (containing 0.3% Cu) was collected in the form of lumps from the Malanjkhand copper mine …
of copper and iron. The method involves concurrent modelling of both the oxidation and leaching kinetics of minerals and the chemical speciation of the lixiviant solutions. The model was calibrated by conducting cyanide leaching experiments on pyrite, chalcopyrite, pyrite + chalcopyrite, pyrite +
Mineral and Metals, Inc. leaches scrap copper by a solution of ammonia, ammonium carbonate, and copper ammonium carbonate (37). Perhaps, leaching copper oxide ores treated with a preliminary reducing roast is economically feasible. Although leaching copper with ammonia is commercially applied, the nature of the reaction is not well understood.
Based on the study of the kinetics of leaching of copper concentrates by nitric acid, the limiting stages, reaction rate constants, activation energies, and general and partial orders of reactions of the components involved have been determined. An effect of films of reaction products on the limiting stage of the leaching of sulfides by nitric acid has been revealed.
When chalcopyrite leaching was compared between sulfuric acid and MSA in these oxidant, MSA achieved higher copper extraction than sulfuric acid medium. The overall activation energy of MSA – H2O2 and MSA – NO3- leaching were 79.8 and 126 kJ/mol, respectively, indicating that the surface chemical reaction governs overall leaching kinetic.
Apr 01, 2013· Leaching kinetics of copper flotation tailings in aqueous ammonia/ammonium carbonate solution Leaching kinetics of copper flotation tailings in aqueous ammonia/ammonium carbonate solution You‐Cai, Liu; Wei, Yang; Jian‐Gang, Fu; Li‐Feng, Li; Dong, Qian 2013-04-01 00:00:00 INTRODUCTION The investigation on leaching for copper oxide ores has developed greatly in the …
investigated the leaching kinetic behavior of copper from low-grade copper oxide ore. They reported that the leaching process by H2SO4 can be described with a reaction model of shrinking core, and the leaching process can be divided into three stages in the system investigated. Moreover, the leaching …
In this study, the kinetics and mechanism of the leaching of iron from copper tailings using sulfuric acid were studied. Under optimal conditions (40 °C, sulfuric acid concentration of 0.53 mol L −1, stirring speed of 400 rpm, solid/liquid ratio of 1 : 10 and leaching time of 120 min), 66.45% of Fe, along with 65.32% of Zn and 59.95% of Cu ...
Oct 26, 2020· This investigation addresses the leaching kinetics of e‐waste for the recovery of copper in H 2 SO 4 ‐H 2 O 2 media with the objective of determining the rate‐controlling step in monosize particle systems. The results are then used to develop a kinetic model for copper dissolution in …
The production of metallic copper from low-grade copper ores is generally carried out by hydrometallurgical methods. Leaching is the first prerequisite of any hydrometallurgical process. Solutions containing ammonia may allow for selective leaching of the copper from the ore. In this study, the leaching kinetics of malachite, which is an oxidized copper ore, in ammonium nitrate solutions …
10%· The leaching behavior of copper from natural chalcocite (Cu2S) particles in alkaline Na4EDTA solutions containing oxygen was examined at atmospheric pressure. The EDTA leaching process took place with consecutive reactions, where the solid product of the first reaction, covellite (CuS), became the reactant for the second. The copper leached into the alkaline solutions was …
The results revealed that compared with the addition of H2O2 at the very beginning, periodic additions of H2O2 enhanced copper extraction and leaching kinetics, and the rate-determining step shifted from the diffusion of oxidant to the surface chemical reaction. The reaction orders with respect to MSA and H2O2 were found to be 0.19 and 1.26 ...
In this study, the leaching kinetics of malachite in perchloric acid solutions was investigated. The dissolution behaviors of copper, zinc, and iron in the ore matrix were determined at different acid concentrations and reaction temperatures.
Kinetics of Copper Ion Leaching from Cement-Solidified Body of Blast Furnace Slag Adsorbing Copper Ion Authors: Ya Li Wang, Zi Mo Li, Ning Yang, Qi Wei, Li Wei Hao Abstract: Blast furnace slag has good adsorption performance and can be used to adsorb heavy metal ions in waste liquid.
Dissolution Kinetics of CuSiO 3 (Chrysocolla) Isaac Curtis Abstract: Chrysocolla is a primary mineral source of copper for the copper leaching industry that contains approximately 34% copper by weight. The present study analyzed the dissolution of copper in sulfuric acid. Chrysocolla was placed in
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. kinetics suitable for dump or heap leaching. kinetics improve with increased temperature cuprite native copper leachable with ...
Apr 01, 2021· 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 the extend of dissolution was investigated. The XRD analysis indicated that copper is mainly in the form of malachite mineral CuCO 3 (OH) 2. The ...
STUDIES ON THE CURING AND LEACHING KINETICS OF MIXED COPPER ORES by Abrahan Barriga Vilca B.A.Sc (Materials Engineering) Universidad Nacional de San Agustin, 1999 B.A.Sc (Metallurgy) Universidad Nacional de San Agustin, 2001 A THESIS SUBMITTED IN PARTIAL FULFILMENT OF THE REQUIREMENTS FOR THE DEGREE OF MASTER OF APPLIED SCIENCE in
kinetics. Heap leach kinetics are characteristically slow, with common leach times of months before desired recoveries are met. THE CHALLENGES Heap leaching is not without its challenges. An accumulation of iron and sulfate ions in the leach liquors over time can impose limitations on leach kinetics and requires rigorous management procedures. The
Jul 12, 2021· Dissolution kinetics in bioleaching processes is a very important method widely used to analyze the mechanism of metal leaching from PCBs [4, 36]. The kinetic of metals (copper, zinc, nickel and aluminum) recovery was studied to better interpret the results obtained and to explain the differences between the metals recovery efficiencies of each ...
Oct 31, 2020· The ANOVA demonstrated that temperature had the greatest influence on copper extraction. The activation energy was 61.93 kJ/mol. The best fit to a linear correlation was the chemical reaction equation that controls the kinetics for the leaching copper from chalcopyrite.
Recently, glycine, one of the simplest amino acids, has been emerging as an efficient and environmental-friendly lixiviant for copper leaching. In the present study, an alkaline glycine–peroxide lixiviant system was used to leach copper from chalcopyrite concentrate by a suite of kinetic …
Leaching process The experiments were performed in an isothermal stirred batch reactor. In each experiment a quantity of 100 ml of ferric chloride solution was introduced in Kinetic modelling of copper leaching process using FeCl3 for recycling waste electrical and electronic equipment the reactor.
Key words: ammonia leaching; chalcopyrite; siderite; leaching kinetics 1 Introduction Chalcopyrite (CuFeS2) has been the chief copper sulfide mineral studied for copper extraction from sulfide ores. This is mainly due to two reasons: 1) it is the most abundant source of sulfide copper in the earth's crust;
The leaching behavior of copper from natural chalcocite (Cu2S) particles in alkaline Na4EDTA solutions containing oxygen was examined at atmospheric pressure. The EDTA leaching process took place with consecutive reactions, where the solid product of the first reaction, covellite (CuS), became the reactant for the second. The copper leached into the alkaline solutions was immediately consumed ...
The leaching behavior of copper from natural chalcocite (Cu 2 S) particles in alkaline Na 4 EDTA solutions containing oxygen was examined at atmospheric pressure. The EDTA leaching process took place with consecutive reactions, where the solid product of the first reaction, covellite (CuS), became the reactant for the second.
Aug 23, 2017· extraction profiles are not found, such as for the 520-day profile, the leaching kinetics are controlled by the intrinsic leaching rate at the surface of the individual copper minerals. Thus, the mechanism controlling the leaching rate of the 1.54-cm (½-inch) monzonite ore fragment changed between the 245th and 520th day of leaching.
This investigation examined the microwave-leaching method to extract copper and zinc from a copper-smelter dust (CSD). The results of microwave-leaching mechanism were compared with conventional heating leaching based on kinetics modelling. The final Cu recovery in the conventional heating and microwave irradiation was 80.88% and 69.83% ...
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 the extend of dissolution was investigated. The XRD analysis indicated that copper is mainly in the form of malachite mineral CuCO 3 (OH) 2. The ...
Leaching kinetics of copper from chalcopyrite concentrate in nitrous-sulfuric acid 403 samples, determined from measurements on an HORIBA/Partica LA-950V2 Particle Size Analyzer, was 35 μm. Ultrafine milling of the as-received material to 15 μm was performed using a ball mill. The size of the product was confirmed by particle size analysis.
Abstract: The leaching kinetics of copper from low-grade copper ore was investigated in ammonia-ammonium sulfate solution with sodium persulfate. The effect parameters of stirring speed, temperature, particle size, concentrations of ammonia, ammonium sulfate and sodium persulfate were determined.
The kinetics of copper minerals leaching was recently published by several authors, for example Sokić at al. kinetics of copper leaching from chalcopyrite [7], Bingol and Canbazoglu kinetics of copper leaching from mala-chite [10,11], while Quast has published the kinetics of copper leaching from atacamite [12]. Also some res-
Leaching is the first prerequisite of any hydrometallurgical pro- cess. Solutions containing ammonia may allow for selective leaching of the copper from the ore. In this study, the leaching kinetics of malachite, which is an oxidized copper ore, in ammonium nitrate solutions was examined.