A kinetic study of copper cementation with zinc in aqueous solutions

Demirkıran, Nizamettin; Ekmekyapar, Ahmet; Künkül, Asım; Baysar, Ahmet

doi:10.1016/j.minpro.2006.10.005

Cited by 72 publications

(30 citation statements)

References 13 publications

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“…In this method, the copper dissolved in the solution is reduced to the metallic state by a more active metal, such as iron, aluminum, or zinc. However, metallic copper obtained by the cementation method is not of high-purity because cement copper tends to form the oxide during the drying procedure (Habashi, 1997;Karavasteva, 2005;Demirkıran et al, 2007). The cement copper can be marketed as a commercial powder product, or it can be purified by applying pyrometallurgical refining or electro-refining processes (Gana et al, 1995;Figueroa et al, 1997).…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, different copper compounds can be prepared by means of various methods, such as precipitation, crystallization, and evaporation. Gaining of copper from various synthetic pure solutions or actual leach solutions containing copper ions by the cementation reaction has been studied by using iron, aluminum, and zinc as the reductant metal (Djokic, 1996;Dib and Makhloufi, 2004;Karavasteva, 2005;Demirkıran et al, 2007;Ahmed et al, 2011;Demirkıran and Künkül, 2011;Ekmekyapar et al, 2012b;Demirkıran, 2013b).…”

Section: Introductionmentioning

confidence: 99%

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Leaching of Malachite Ore in Ammonium Sulfate Solutions and Production of Copper Oxide

Ekmekyapar

Demirkıran

Künkül

et al. 2015

Braz. J. Chem. Eng.

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-Malachite ore is one of the most important of oxidized copper ores. Copper production can be performed by using this ore. In this work, the leaching kinetics of malachite in ammonium sulfate solutions was investigated, and metallic copper was recovered by a cementation method from the resulting actual leach solution. Copper (II) oxide was prepared by an isothermal oxidation method from the cement copper. In the leaching experiments, the effects of reaction temperature, particle size, and stirring speed on copper leaching from malachite ore were studied. In the cementation experiments, metallic zinc was used as the reductant metal to recover the copper from the solution. Thermal oxidation of cement copper was performed under isothermal conditions. It was found that the leaching rate increased with increasing stirring speed and temperature, and decreased with particle size. It was observed that the leaching reaction fit to diffusion through the product layer. The activation energy of the leaching process was determined to be 25.4 kJ/mol. It was determined that the copper content of the metallic product obtained by the cementation method increased up to 96%. It was found that copper oxide prepared from cement copper had a tenorite structure.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Leaching of Malachite Ore in Ammonium Sulfate Solutions and Production of Copper Oxide

Ekmekyapar

Demirkıran

Künkül

et al. 2015

Braz. J. Chem. Eng.

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“…The results indicated that, the present data fit the Arrhenius equation with activation energy 17.83 kJ/mol which shows that the cementation process is diffusion controlled. 3,4,20 The thermodynamic activation activation parameters namely, enthalpy of activation ¦H º , entropy of activation ¦S º and free energy of activation ¦G º were calculated from the following equations: 8,9,18…”

Section: T ¼ Constant ð9þmentioning

confidence: 99%

Recovery of Copper from Synthetic Solution by Cementation on Moving Bead of Zinc Spheres

et al. 2014

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This work deals with the cementation of copper from sulfate solution on moving zinc beads as sacrificial metal using magnetic stirring. The efficiency of zinc beads in copper recovery has been estimated in terms of kinetic and apparent mass transfer coefficients according to operating parameters such as initial copper ion concentration, rotational speed, zinc beads diameter as well as temperature. Kinetic investigation showed that the copper cementation reaction follows a first order reaction and the activation energy was calculated. The rate of diffusion controlled cementation of copper ions was expressed in terms of the mass transfer coefficient; the data were correlated with the following dimensionless correlation: Sh = 0.7485 Sc . The resulting samples of zinc beads surface and copper precipitate were characterized by two analysis methods, scanning electron microscopy (SEM) and X-Ray (EDX) which confirmed that about 99% of copper can be recovered from the sulfate solution.

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“…A wide variety of techniques has been developed for the removal/recovery of copper ions from wastewater including cementation [6], precipitation [7], solvent extraction [8], adsorption [9] reduction [10], biosorption [11], ion exchange [12], chelation [13], electrocoagulation [14], electrodialysis [15], pressure driven membrane processes [16], liquid membranes [17][18][19][20], and combined methods (chelation plus pressure-driven membranes processes) [21].…”

Section: Introductionmentioning

confidence: 99%

Kinetic Study of Copper(II) Simultaneous Extraction/Stripping from Aqueous Solutions by Bulk Liquid Membranes Using Coupled Transport Mechanisms

León

Senent

et al. 2016

Metals

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Heavy metals removal/recovery from industrial wastewater has become a prime concern for both economic and environmental reasons. This paper describes a comparative kinetic study of the removal/recovery of copper(II) from aqueous solutions by bulk liquid membrane using two types of coupled facilitated transport mechanisms and three carriers of different chemical nature: benzoylacetone, 8-hydroxyquinoline, and tri-n-octylamine. The results are analyzed by means of a kinetic model involving two consecutive irreversible first-order reactions (extraction and stripping). Rate constants and efficiencies of the extraction (k 1 , EE) and the stripping (k 2 , SE) reactions, and maximum fluxes through the membrane, were determined for the three carriers to compare their efficiency in the Cu(II) removal/recovery process. Counter-facilitated transport mechanism using benzoylacetone as carrier and protons as counterions led to higher maximum flux and higher extraction and stripping efficiencies due to the higher values of both the extraction and the stripping rate constants. Acceptable linear relationships between EE and k 1 , and between SE and k 2 , were found.

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A kinetic study of copper cementation with zinc in aqueous solutions

Cited by 72 publications

References 13 publications

Leaching of Malachite Ore in Ammonium Sulfate Solutions and Production of Copper Oxide

Leaching of Malachite Ore in Ammonium Sulfate Solutions and Production of Copper Oxide

Recovery of Copper from Synthetic Solution by Cementation on Moving Bead of Zinc Spheres

Kinetic Study of Copper(II) Simultaneous Extraction/Stripping from Aqueous Solutions by Bulk Liquid Membranes Using Coupled Transport Mechanisms

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