Influence of hydrolysable metal ions on interfacial chemistry and particle interactions of aqueous muscovite dispersions
Date
2010
Authors
Nosrati, A.
Addai Mensah, J.
Skinner, W.
Editors
Advisors
Journal Title
Journal ISSN
Volume Title
Type:
Conference paper
Citation
2010 Chemeca proceedings: Engineering at the edge, 2010
Statement of Responsibility
Conference Name
Chemeca 2010 (26 Sep 2010 - 29 Sep 2010 : Adelaide, Australia)
Abstract
Attractive particle interactions which lead to enhanced rheology of concentrated mineral dispersions are encountered in a number of hydrometallurgical mineral processing operations. The presence of reactive clay minerals (e.g., muscovite and chlorite) plays a pivotal role in defining the pulp chemistry and concomitant particle interactions through incongruent leaching. In the present work, the influence of two hydrolysable metal ions (Al(III) and Fe(III)) which invariably leach out of clay particles, on pulp/interfacial chemistry and rheology of low Fe-substituted muscovite dispersions has been investigated at pH range 3 - 10 and 25 C. Metal ion-induced interfacial changes were cation type and pH-dependent, where Al(III) showed stronger impact on particle zeta potential behaviour at similar ion concentrations. These interfacial changes also influenced the muscovite particles' interactions, reflected in significantly enhanced dispersion shear yield stresses. The treatment of the particle zeta potential and shear yield stress data with elastic floc model revealed the emergence of unexpected additional attractive forces; the nature of those depended upon metal ion type and ionic strength. These metal ion-induced, additional attractive particle interactions are believed to emerge via different mechanisms such as enhanced van der Waals attraction, electrostatic-charge patch attraction, adsorbed ion correlation-particle bridging, surface nucleation and cementation.
School/Discipline
Dissertation Note
Provenance
Description
Access Status
Rights
Copyright 2010 ICMS Pty Ltd