KINETICS OF COPPER AND CADMIUM CEMENTATION BY ZINC POWDER
Vitor de Andrade Alvarenga Oliveira José Márcio Soares Penna Lucas Sanches Magalhães Versiane Albis Leão Cláudio Gouvea dos Santos
The cementation of copper and cadmium by zinc powder was investigated in order to assess the influence of different parameters in the process. The results showed that the process follows a first order reaction with two stages in both systems. In the system Cu/Zn, the second stage is faster than the first while in the system Cd/Zn the second stage is slower than the first. In the system Cu/Zn, the variation on the surface area of copper cement followed a power law and a straight line was obtained by plotting –ln([Cu2+]/[Cu2+] 0 ) against t3/2, the activation energy was calculated as 16.3kJ. In the system Zn/Cd the surface area available for reaction decreased as a result of the cement agglomeration. On the experiments carried out with ions Cu2+ and Cd2+ in solution, purer copper cement was obtained when the experiments were carried out in the presence of less than stoichiometric amount of zinc powder and longer reaction times.
1 Ahmed IM, El-Nadi YA, Daoud JA. Cementation of copper from spent copper-pickle sulfate solution by zinc ash. Hydrometallurgy. 2011;110:62-66.
2 Dib A, Makhloufi L. Mass transfer correlation of removal of nickel by cementation onto rotating zinc disc in industrial zinc sulfate solutions. Minerals Engineering. 2007;20:146-151.
3 Konsowa AH. Intensification of the rate of heavy metal removal from wastewater by cementation in a jet reactor. Desalination. 2010;254:29-34.
4 Power GP, Ritchie IM. A contribution to the theory of cementation (metal displacement) reactions. Australian Journal of Chemistry. 1976;29:699-709.
5 Power GP, Ritchie IM. Metal displacement (cementation) reactions: The mercury(II)/copper system. Electrochimica Acta. 1977;22:365-371.
6 Sędzimir JA. Precipitation of metals by metals (cementation) - kinetics, equilibria. Hydrometallurgy. 2002;64:161-167.
7 Younesi SR, Alimadadi H, Alamdari EK, Marashi SPH. Kinetic mechanisms of cementation of cadmium ions by zinc powder from sulphate solutions. Hydrometallurgy. 2006;84:155-164.
8 Farahmand F, Moradkhani D, Sadegh Safarzadeh M, Rashchi F. Optimization and kinetics of the cementation of lead with aluminum powder. Hydrometallurgy. 2009;98:81-85.
9 Karavasteva M. The effect of certain surfactants on the cementation of nickel from zinc sulphate solutions by suspended zinc particles in the presence of copper. Canadian Metallurgical Quarterly. 1999;38:207-210.
10 Gouvea LR, Morais CA. Recovery of zinc and cadmium from industrial waste by leaching/cementation. Minerals Engineering. 2007;20:956-958.
11 Safarzadeh MS, Bafghi MS, Moradkhani D, Ilkhchi MO. A review on hydrometallurgical extraction and recovery of cadmium from various resources. Minerals Engineering. 2007;46:1332-1340.
12 Safarzadeh MS, Moradkhani D, Ilkhchi MO. Determination of the optimum conditions for the cementation of cadmium with zinc powder in sulfate medium. Chemical Engineering and Processing: Process Intensification. 2007;20:211-220.
13 Stanojević D, Nikolić B, Todorović M. Evaluation of cobalt from cobaltic waste products from the production of electrolytic zinc and cadmium. Hydrometallurgy. 2000;54:151-160.
14 Alemany C, Aurousseau M, Lapicque F, Ozil P. Cementation and corrosion at a RDE: changes in flow and transfer phenomena induced by surface roughness. Journal of Applied Electrochemistry. 2002;32:1269-1278.
15 Amin NK, El-Ashtoukhy ESZ, Abdelwahab O. Rate of cadmium ions removal from dilute solutions by cementation on zinc using a rotating fixed bed reactor. Hydrometallurgy. 2007;89:224-232.
16 Dib A, Makhloufi L. Mass transfer correlation of simultaneous removal by cementation of nickel and cobalt from sulphate industrial solution containing copper: Part II: onto zinc powder. Chemical Engineering Journal. 2006;123:53-58.
17 Gros F, Baup S, Aurousseau M. Copper cementation on zinc and iron mixtures: Part 1: results on rotating disc electrode. Hydrometallurgy. 2011;106:127-133.
18 Karavasteva M. The effect of certain surfactants on the cementation of cadmium by suspended zinc particles. Hydrometallurgy. 1997;47:91-98.
19 Wadsworth ME, Miller JD. Hydrometallurgical processes. In: Sohn HY, Wadsworth ME. editors. Rate processes of extractive metallurgy. New York: Plenum Press; 1979. p. 133-244.
20 Taha AA, Abd El-Ghani SAH. Effect of surfactants on the cementation of cadmium. Journal of Colloid and Interface Science. 2004;280:9-17.
21 Lee EC, Lawson F, Han KN. Effect of precipitant surface roughness on cementation kinetics. Hydrometallurgy. 1978;3:7-21.