Oliveira, Víctor de Andrade AlvarengaPenna, José Márcio SoaresMagalhães, Lucas SanchesLeão, Versiane AlbisSantos, Claudio Gouvea dos2020-09-082020-09-082019OLIVEIRA, V. de A. A. et al. Kinetics of copper and cadmium cementation by zinc powder. Tecnologia em Metalurgia, Materiais e Mineração, São Paulo, v. 16, n. 2, p. 255-262, abr./jun. 2019. Disponível em: <https://tecnologiammm.com.br/doi/10.4322/2176-1523.20191661>. Acesso em: 10 mar. 2020.2176-1523http://www.repositorio.ufop.br/handle/123456789/12709The 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.en-USabertoArtigo publicado em periodicoThis is an open access paper, published under the Creative Commons CC BY-NC-ND license (Attribution-NonCommercial-NoDerivs) - https://creativecommons.org/licenses/ by-nc-nd/4.0/. Fonte: o próprio artigo.http://dx.doi.org/10.4322/2176-1523.20191661