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espanolEn este estudio se determino el efecto de la adicion de agentes inhibidores y/o afinadores de grano comunmente utilizados en la electrorefinacion industrial de cobre sobre el coeficiente de difusion de ion cuprico a composicion de acido, cobre y temperatura en el rango industrial promedio. El coeficiente de difusion del ion cuprico DCu2+ se obtuvo de acuerdo a la expresion de Levich a traves de mediciones de corriente limite sobre electrodo de disco rotatorio de acero inoxidable 316 L en soluciones sinteticas de composicion 40 g/L de Cu2+ y 200 g/L de H2SO4 a 60°C con adicion de cola, tiourea y cloruro a tres niveles de concentracion y se compararon con el valor obtenido en soluciones en ausencia de estos aditivos. La incorporacion de aditivos resulta en una leve disminucion del coeficiente de difusion del Cu2+ siendo mas significativa en presencia de iones cloruro. EnglishThe effect of levelling and grain-refining agents on the diffusion coefficient of cupric ion was studied. Tests were performed using synthetic solutions with Cu2+ concentration and acidity similar to those of a copper electro-refining industrial electrolyte by means of rotating disc electrode (RDE) technique. The diffusion coefficient was calculated according to Levich’s expression from measurements of limiting current for different rotating speed of the RDE. Arrhenius dependence of the diffusion coefficient with temperature in the absence of additives was verified. In presence of additives, the variation of the limiting current is mainly attributed to changes in diffusion coefficient of cupric ion observed.

dyna

Effect of additives on diffusion coefficient for cupric ions and kinematics viscosity in CuSO&lt;sub&gt;4&lt;/sub&gt;-H&lt;sub&gt;2&lt;/sub&gt;SO&lt;sub&gt;4&lt;/sub&gt; solution at 60°C