Studies on the Interaction of Guar Gum With Chalcopyrite

Abstract

-Adsorption, electrokinetic and flotation studies have been carried out to investigate the interaction of guar gum with chalcopyrite. The adsorption density of guar gum onto chalcopyrite shows a weak adsorption maximum at pH 9.5. The adsorption isotherms exhibit Langmuirian behaviour. The electrophoretic mobilities of chalcopyrite are decreased in proportion to the added concentration of guar gum. Flotation tests reveal that guar gum depresses chalcopyrite in agreement with the adsorption data. Dissolution experiments indicate release of lattice metal ions from chalcopyrite, while co-precipitation and conductivity tests confirm guar gum-metal ion interaction in the bulk solution. The pH of maximum co-precipitation between guar gum and copper species is observed in the range 9-9.5. The adsorption process is governed primarily by chemical interaction between the hydroxyl groups of guar gum and hydroxylated chalcopyrite apart from hydrogen bonding. Fourier Transform Infrared Spectrometer (FTIR) and X-ray Photoelectron Spectroscopic Studies (XPS) provide evidence in support of the interaction mechanisms proposed.Résumé -On a exécuté des études d'adsorption, d'électrocinétique et de flottation afin d'examiner -l'interaction de la gomme de guar avec la chalcopyrite. La densité d'adsorption de la gomme de guar sur la chalcopyrite montre un maximum d'adsorption faible à un pH de 9.5. Les isothermes d'adsorption exhibent un comportement langmuirien. Les mobilités électrophorétiques de la chalcopyrite diminuent en proportion de la concentration de gomme de guar. Les tests de flottation révélent que la gomme de guar déprime la chalcopyrit, en accord avec les données d'adsorption. Les expériences de dissolution indiquent un reléchement des ions métalliques du réseau de la chalcopyrite, alors que des tests de co-pré-cipitation et de conductivité confirment l'interaction gomme de guar -ion métallique dans la solution en vrac. Le pH de co-précipitation maximum entre la gomme de guar et les espéces de cuivre se trouve entre 9 et 9.5. Le procédé d'adsorption est gouverné principalement par l'interaction chimique entre les groupes hydroxyles de la gomme de guar et la chalcopyrite hydroxylée, à l'écart des liens hydrogénes. Les études par FTIR et XPS fournissent l'évidence supportant les mécanismes d'interaction propoés.

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