Abstract
The effect of the additive non ionic polyacrylamide (PAM), was studied at the laboratory level, as refining crystalline grain in the copper electrorefining. Experiments were performed 24 h of electrolysis, using an electrolyte of copper sulphate acid, with 0.5 to 10 mgl -1 polyacrylamide at 55 °C and a current density of 260 Am -2 . The effectiveness of these organic additives in copper electrorefining was determined by directly measuring the surface roughness of the copper deposit and contrasted with the results of other instrumental techniques (SEM and metallographic analysis). The results of the analysis SEM, metallographic analysis and measurement of the surface roughness of the copper deposit, show that to concentrations as low as 0.5 mgl -1 of this additive is manifested its property of tuner of grain. However, in the range of 7 to 10 mgl -1 of polyacrylamide, it reaches an optimum size of grain for the deposit of copper in the cathodes.
Highlights
Effect of the polyacrylamide concentration on the quality of the copper deposit obtained by electrolytic refining
Experiments were performed 24 h of electrolysis, using an electrolyte of copper sulphate acid, with 0.5 to 10 mgl-1 polyacrylamide at 55 °C and a current density of 260 Am-2. The effectiveness of these organic additives in copper electrorefining was determined by directly measuring the surface roughness of the copper deposit and contrasted with the results of other instrumental techniques (SEM and metallographic analysis)
The results of the analysis SEM, metallographic analysis and measurement of the surface roughness of the copper deposit, show that to concentrations as low as 0.5 mgl-1 of this additive is manifested its property of tuner of grain
Summary
Etapa final de la cadena de valor de obtención de cátodos de cobre, es una operación que presenta una gran complejidad debido al gran número de fenómenos involucrados y variables operacionales que intervienen en el proceso. En electro-obtención, en cambio, mayoritariamente la industria ha utilizado la goma “guar”, polisacárido de la familia de los galactamananos que se comercializa bajo diversos nombres comerciales,. Recientemente, ha empezado a aplicarse en algunas plantas de electroobtención de Chile, un aditivo inhibidor, registrado bajo el nombre de DXG-F7, correspondiente a una dextrina, que promete resultados aun superiores a los alcanzados con la goma “guar”[11]. Estudios posteriores realizados por Fabian et al.[13 y 14], indican que el compuesto poliacrilamida, activado en disolución ácida diluida (en una dieciseisava parte) y agregado al electrolito en el rango de concentración desde 0,01 hasta 10 mgl-1, genera depósitos de grano más fino que los obtenidos con “guar”
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