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PARTICLE SIZE EFFECT ON THE HYDROFOBICITY AND THE NATURAL FLOATABILITY OF MOLIBDENITE
AGUSTÍN FRANCISCO CORREA

Universidad de Concepción 1986 (2006 English Edition)

2 PARTICLE SIZE EFFECT ON THE HYDROFOBICITY AND THE NATURAL FLOATABILITY OF MOLIBDENITE A Thesis Presented to the Faculty of the Department of Chemical Engineering Graduate School Universidad de Concepción In PartialFulfilment of the Requirements for the Degree Master of Science in Engineering and Metallurgy By Agustín Correa Concepción, Chile, September 1986 Thesis directed by Professor Dr. Sergio Castro Flores Head of the Program: Dr Igor Wilkomirsky The original Spanish version of this thesis was revised by the Committee members: Dr. Sergio Montes Dr. Christian Hecker 2006 Revision and Translationby Agustín Correa and Alfredo Correa Tedesco

Table of Contents
Table of Contents..............................................................................................................3 Introduction.......................................................................................................................5Motivation.......................................................................................................................5 Objectives of the work....................................................................................................5 Chapter 1 Bibliographic revision........................................................................................................6 1.1 Surfacecharacterisation.............................................................................................6 1.1.1 Surface tension....................................................................................................6 1.1.2 Adsorption and Surface Free Energy..................................................................7 1.1.3 Energy and molecular interacting forces and their relationship with the surface freeenergy...................................................................................................................8 1.2 Contact Angle...........................................................................................................10 1.2.1 Analysis of the terms that compose Young’s equation......................................12 1.3 Adhesion Work of aLiquid......................................................................................13 1.4 Adhesion Work.........................................................................................................14 1.5 Solid-liquid spreading coefficient............................................................................14 1.6 Characterisation of a liquid and its interrelation with a liquid through thecontact angle measurements.......................................................................................................14 1.7 Theoretical Studies of Models that link and with the surface energies determination.................................................................................................................15 1.7.1 ZismanModel...................................................................................................15 1.7.2 Girifalco-Good’s Model....................................................................................17 1.7.3 Fowkes’ Model.................................................................................................20 1.7.4 Wu’sModel.......................................................................................................23 1.7.5 Dann’s model....................................................................................................24 1.7.6 Wetting diagrams..............................................................................................26 1.7.7 Relationship between the different models.......................................................28 1.8 Contact angle and...