[13] H.Y. Sohn, and M.E. Wadsworth, Cinética de los procesos de metalurgia extractiva, Edited by Trillas, Mexico City, Mexico, , p [14] A.R. Geyne, C. 1 Centro de Investigaciones en Materiales y Metalurgia, Universidad Sohn, H. Y.; Wadsworth, M. E., Cinética de los Procesos de la Metalurgia Extractiva, Ed. 3Instituto de Metalurgia, Universidad Autónoma de San Luis Potosí, Av. Sierra .. [12] A. Ballester, L.F. Verdeja, and J. Sancho, Metalurgia Extractiva, Vol. 1, [13] H.Y. Sohn, and M.E. Wadsworth, Cinética de los procesos de metalurgia.

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In any case, rxtractiva could be a period where active sites are created until a reaction front is established. It was proved that surface attack of the arsenical jarosite with HCl a way to create surface defects or to remove submicron films reduces the induction period.

Ionic liquids as additives for acid leaching of copper from sulfidic ores. In addition, these results rule out the control by transport through the layer of the product.

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However, these models were deduced by considering the constant increases in the reaction interface, which in this case did not happen. R; Handbook of Chemistry and Physics89 th ed. The values of the rate experimental constants K exp were obtained by linear regression of equation 2.

Conclusions The alkaline decomposition of the arsenical natrojarosite is characterized by the removal of sulfate and sodium ions from the lattice and their diffusion to the solution, while a gel of iron hydroxide with adsorbed arsenate is formed. SEM analysis indicated the formation of a reaction front.

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Samuel Navarrete Cifuentes Treatment technologies are available and most of them have been developed for the removal of arsenic at an industrial scale in water treatment plants.


At higher OH – concentrations, t ind became independent from that value. In spite of these differences, the temperature effect was exponential in both media.

For these analyses, standards with an identical matrix were used. The data are consistent with the cinetia Figure 6. During the induction period, there are no morphological changes or formation of any detectable solid layer at practical resolution levels of the EDS technique ca.

Jaime Morales Saavedra – Escuela de Ingeniería Química

Jorge Coloma Apoyo Laboratorios. Besides, in both media, t ind is independent from the particle size Figure 9which confirms that the activation process is a phenomenon occurring at levels of molecular thickness, involving only the initial surface. In order to study the stoichiometry of the reaction, samples of arsenical natrojarosite were treated for long periods with NaOH and Ca OH 2.

For [OH – ] concentrations below 2.

March 10, Published online: Modeling of liquid-liquid equilibrium for binary and ternary systems containing ionic liquids with the hexafluorophosphate anion using the ASOG method. The activation energy values are within the limits of chemical control. The kinetic expression of the decomposition of the arsenical natrojarosite in Ca OH 2 medium for [OH – ] concentrations ranging from 2. The WHO World Health Organization establishes, through its guidelines, that the maximum admissible content of arsenic in potable water should be reduced from 0.

The kinetic expression of the arsenical natrojarosite decomposition in NaOH medium for [OH – ] concentrations ranging from 3. However, since it is a common phenomenon in the decomposition of this type of compounds, the induction period has not been eliminated in this research work, and ,os dependence on OH – concentration, temperature and particle size have been determined.


The OH – concentration was calculated on the base of the pH of the solution, and the ionic constant of the water was calculated on the base of the working temperature. Figure 10 shows the particle size effect on the decomposition rate of the arsenical natrojarosite. The density measurement yielded a value of 2. For [OH – dee concentrations below 3. Madrid,chapter 7.

The study provides the kinetics and nature of the decomposition reaction topology, reaction rates and dependence of the reaction on variables such as medium concentration, temperature and particle size. Lks,chapter 2.

Extrsctiva mixtures at The resulting chemical composition 4. It is important to note that, during the alkaline decomposition process, arsenic was not detected in the samples analyzed by AAS and ICP. Arsenic integrated in the structure could influence the solubility of the jarosite, potentially stabilizing the structure under a wide range of conditions that are tolerated by pure jarosite. Acta70 In Ca OH 2 medium, a similar procedure was applied: The values of the induction times t ind were obtained from the intersections of the regression straight line with the time axis.

Rate experimental constant values corrected cineticx the size factor are shown in Table 1. This leads to the conclusion that it is a surface phenomenon occurring at a level of molecular thickness, which is related to adsorption processes and whose detailed mechanism needs to be studied by means of techniques that were unavailable for this work.