Abstract
Se ha estudiado la eliminación del indio(III), de medios acuosos, mediante la resina de intercambio catiónico Dowex-400 midiendo el tanto por ciento de esta eliminación en función de la dosificación de resina y el pH de la disolución acuosa. La velocidad de agitación (300-1000 min−1) aplicada al sistema no tiene influencia sobre la eliminación del indio(III) de la disolución, estando el proceso de carga del metal en la resina asociado a un modelo de difusión en la disolución. La eliminación del metal de la disolución disminuye con la disminución del valor del pH. El proceso de intercambio es exotérmico (ΔH°= -90 kJ·mol−1), y siendo el modelo cinético dependiente de la temperatura: seudo-primer orden a 20 °C, segundo orden a 30 °C y seudo-segundo orden a 40 °C. La isoterma de Langmuir de tipo-2 es el modelo que mejor representa al proceso de carga del metal en la resina. El indio(III) cargado en la resina puede ser eluido mediante disoluciones acidas, regenerándose, al mismo tiempo, la resina.
Highlights
As a unit operation in Hydrometallurgy, the ion exchange with resins technique has been widely used to the recovery/separation/removal of practically all the metals from different resources or wastes
Metal uptake experiments were carried out by the following procedure: 200 mL of the aqueous solutions and the corresponding resin dosage were placed in a glass reactor and mechanically shaken via a for blades glass impeller (2.3 cm diameter), and samples were withdrawn at elapsed times
The results indicate that Dowex-400 resin remove indium(III) from aqueous solutions
Summary
As a unit operation in Hydrometallurgy, the ion exchange with resins technique has been widely used to the recovery/separation/removal of practically all the metals from different resources or wastes. Ion exchange processing using resins has the advantages, over other separation technologies, i.e. solvent extraction and liquid membranes, that it can be use on highly diluted solutions and/or non-clarified ones. Following on the series (Alguacil, 2002; Alguacil et al, 2002; Alguacil, 2003; Alguacil, 2017a; Alguacil, 2017b; Alguacil, 2018a; Alguacil 2018b; Alguacil and Escudero, 2018; Alguacil 2019a; Alguacil 2019b; Alguacil 2019c; Alguacil and Escudero, 2020; Alguacil 2020), in this work, the adsorption of In3+ from acidic aqueous solutions by using Dowex-400 cationic exchange resin is investigated. The elution of the metal from In3+-loaded resin by acidic solutions is carried out
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