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Leaching kinetics of low-grade copper ore containing calcium-magnesium carbonate in ammonia-ammonium sulfate solution with persulfate LIU Zhi-xiong1, 2, YIN Zhou-lan 1, HU Hui-ping1, CHEN Qi-yuan1 1. School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China 2. College of Chemistry and Chemical Engineering ...
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
Jul 23, 2018 During the leaching process, the surface tension of the solution did not substantially change, and that of the solution with surfactant increased slightly. The kinetics analysis of ore column leaching illustrated that the leaching processes were controlled by both internal diffusion principal factor and chemical reaction.
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.
In the leaching of sulfide-bearing ores with sulphuric acid solutions fully and with relatively high kinetics involves leaching of copper from its oxidized minerals - malachite Cu 2 OH 2 CO 3, azurite Cu 3 OH 2 CO 3 2 and grisoli CuSiO 3 2H 2 O, albeit with less intensity, according to the following chemical reactions
Aug 01, 2009 Leaching typical residues formed after leaching of the fine ore average particle size d m 3 mm using lixiviant solutions at 60120 gL H 2 SO 4 contained 92 SiO 2 and 4 muscovite. Copper, cobalt and manganese contents in these residues were below the detection limit of the X-ray diffraction and the EDX equipments used.
Aug 01, 2020 Konkola West Concentrator stockpile handles 55000 tonnes copper ore per day producing an average of 400 tonnes of concentrate. The grade of the concentrate is 36 to 40 TCu. The plant efficiency recovery is at 89 TCu. The concentrator operations include Primary, secondary and tertiary crushing, grinding, flotation, dewatering and tailings disposal.
Mar 25, 2020 Cyanide leaching process is one of the common gold ore beneficiation processes. The process index depends on factors such as gold particle size, sulfide content, ore block size, leaching speed, leaching time, cyanide concentration and leaching slag washing degree. The factors that affect gold leaching include grinding fineness, pH, temperature, cyanide dosage, pulp-solid-liquid ratio, leaching ...
nickel laterites, copper ore leaching, uranium ore processing, copper SX-EW, heap leaching and solvent extraction. ALTA conferences. are a world-class annual metallurgical conference and a leading platform for innovation. It comprises five international conferences, panel
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.
Dec 12, 2009 The kinetic behavior of leaching copper from low grade copper oxide ore was investigated. The effects of leaching temperature, H2SO4 concentration, particle size of crude ore and agitation rate on the leaching efficiency of copper were also evaluated. And the kinetic equations of the leaching process were obtained. The results show that the leaching process can be described with a
Sulphide ore mixed with copper and zinc is processed with pressure acid leaching. Research is conducted on the copper kinetic. The stirring rate is set at 600 rpm which could eliminate the influence of external diffusions. Research is conducted on the factors affecting the copper leaching kinetic are temperature, pressure, concentration of sulfuric acid, particle size.
Leaching kinetics of copper from chalcopyrite concentrate in nitrous-sulfuric acid 401 CuFeS 2 8NaNO 2 6H 2 SO 4 CuSO 4 FeSO 4 2NO 2g 6NO g 4Na 2 SO 4 2S o 6H 2 O 1 2FeSO 4 2NaNO 2 2H 2 SO 4 Fe 2 SO 4 3 Na 2 SO 4 2NO aq 2H 2 O. 2 In that study, it was found that both nitric oxide NO g and nitrogen dioxide NO 2g
Apr 26, 2012 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
minerals. The leaching experiments were performed using sulphuric acid solutions, whereby the kinetics of copper leaching was investigated with respect to acid concentration and solid to liquid ratio. The copper concentration in the leach solution ranged from 0.80 to 1.75 g dm-3. The total Cu recovery rate ranged from 30 to 56 , whereas the
Keywords leaching, copper ore, sensor-based, pre-concentration, kinetics Introduction Most of the world high-grade copper resources are dwindling due to growing exploitation to meet global demand owing to technological advancement Haque et al., 2014. With most copper ore body increasingly becoming complex due to high
Jun 24, 2004 In this study, the leaching kinetics of malachite CuCO3 CuOH2, an oxidized copper ore, was investigated in water saturated with ammonia gas. In the experiments, the ammonia concentration of the solution, the particle size of the ore, the temperature, the stirring speed, and the solid-to-liquid ratio were chosen as parameters. It was determined that the leaching rate of malachite
A method of leaching copper from copper sulphide-containing concentrates, such as chalcopyrite, includes using pyrite as a catalyst for ferric reduction in order to eliminate passivation of the chalcopyrite surface, the process being carried out under conditions whereby the pyrite is not materially oxidized, for example by maintaining the operating solution potential at a suitable level.
leaching of iron. 1. Introduction Copper tailing is the residual ore le a er copper extraction during a oatation process, which is more dicult to recycle as compared to the copper slag. Its main components are fayalite Fe 2SiO 4 and magnetic iron oxide Fe 3O 4, accounting formorethan55ofthecoppertailings.1 In 2015, it is esti-
atmospheric leaching of primary copper concentrates in a sulfate medium. It has been shown that in the presence of pyrite, the kinetics of leaching accelerates significantly as a result of a strictly chemical reaction, and therefore requires no microbe. In addition, fine grinding is not required in this process.
4.3 CYANIDE LEACHING OF THE COPPER CONCENTRATE 92 4.3.1 The effect of copper 101 4.3.2 The role of iron 106 4.3.3 The role or nickel 107 4.3 .4 The role of silver 109 4.3.5 Theroleofzinc 109 4.4 THE EFFECT OF COPPER CYANIDE ON GOLD LEACHING FROM OXIDE AND SULPHIDE ORES 110 4.5 SUMMARY 114 CHAPTERS PREG-ROBBING PHENOMENA IN THE
Nov 10, 2017 1. Introduction. Heap leaching of chalcopyrite CuFeS 2 yields much lower copper recoveries that those obtained from leaching chalcocite Cu 2 S ores. The low recoveries are thought to be caused by the deposition of reaction products on the chalcopyrite surfaces, forming a passivating layer that hinders dissolution of the mineral Watling, 2013.The nature of the passivating layer is still ...
Ultrasonic-assisted leaching kinetics for the recovery of copper from poorly soluble chalcopyrite 1749 Korean J. Chem. Eng.Vol. 34, No. 6 1. Basic Leaching In the basic leaching process, copper is reacted with FeCl 3 as the reactant in an aqueous solution of HCl. The reaction is repre-sented by Eq. 1. The solid sulfur So produced from the ...
Kinetics of the chemical leaching of chalcocite from a low-grade copper ore in a ferric sulfate medium was investigated using the constrained least square optimization technique. The experiments were carried out for different particle sizes in both the reactor and column at constant Eh, pH, and temperature. The leaching rate increased with increase in the temperature.
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