[en] The adsorption patterns of potassium amylxanthate on the surface of high purity malachite subjected to prior sulfidization with NaSH have been followed and elucidated. DRIFTS spectroscopy has been used to trace the associated physicochemical alterations as well as the chemical species present on the mineral surface. Varying the collector concentration from 5.10-4 to 1.10-2 mol/L has led to different degree of surface coverage of the alkyl groups in combination with formation of organometallic hydrophobic complexes of CuX and CuX – X2 type. The results reveal that the CuX complex formed on the malachite surface without sulfidizing agent is more unstable and prone to dissolution-precipitation phenomena. Based upon the constructed adsorption isotherms and upon the degree of statistical coverage, different zones of mineral-reagent interactions could be distinguished. They correspond respectively to the monolayer, bi-layer and tridimensional condensation domains. In each of the identified zones mono or double layer adsorption patterns of the collector are proposed leading respectively to formation of surface compounds with different degree of hydrophobicity.
Disciplines :
Geological, petroleum & mining engineering
Author, co-author :
Kanda, Jean-Marie; Université de Lubumbashi
Kongolo, Mukendi; Université de Lorraine
Gaydardzhiev, Stoyan ; Université de Liège - ULiège > Département ArGEnCo > Traitement et recyclage des matières minérales
De Donato, Philippe; Universite de Lorraine
Barres, Odile; Université de Lorraine
Bastin, David ; Université de Liège - ULiège > Département ArGEnCo > Géoressources minérales & Imagerie géologique
Language :
English
Title :
Insights upon the adsorption mechanism of KAX on malachite
Publication date :
20 October 2014
Event name :
XXVII International Mineral Processing Congress
Event organizer :
Gecamin Chile
Event place :
Santiago, Chile
Event date :
20-24 X 2014
Audience :
International
Main work title :
Proceedings of the XXVII International Mineral Processing Congress
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