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Role of Physicochemical Aspects of Fibrous Particles in

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1 Role of Physicochemical Aspects of Fibrous Particles in
Suspension Rheology and Mineral Beneficiation P. Patra Columbia University, Cytec Industries. Center for Particulate & Surfactant Systems (CPaSS) IAB Meeting New York City, N.Y. August 2009

2 Goal-Objective Goal Objective
Develop scientific understanding on rheology of concentrated mineral suspension - Particles of varying physicochemical properties Objective Determine contributions of Physical factors Morphology, Rugosity, Particle size Entanglement of fibers – Network formation and hydrodynamics Chemical factors Strength of network: Electrostatic, chemical interaction and hydrophobic interaction

3 www. petroleum-industry.usca9425.html
Impact Desired properties of suspensions Higher solids content, Varying morphology Coarse /Fibrous particles, Low yield stress and viscosity, Static and dynamic stability. Food Industries Cosmetics Mineral Processing Paints Petroleum Cement www. petroleum-industry.usca9425.html

4 Materials and Methods Spiking Experiment:
Examine rheological property of the pulp Coarse particles Fibrous particles – Nylon Fibers Flotation Grind Ore mixture Rheological characterization Yield Stress Chemically Inert Fibrous particles Fibrous particles – High Fiber Ore (Fibrous minerals ) Coarse particles - Copper Ore

5 Spiking Experiments: Copper Ore mixed with Fibrous Ore in varying amounts
Video on Pulp Rheology Rheological behavior is affected with fibrous minerals in the suspension

6 Network Formation by Fibrous Particles in Suspension
SEM of dry fibers in Fibrous ore SEM of pulp – Copper ore +Fibrous ore Fibrous minerals form a strong network due to multiple contact among fibers - entanglement Network causes the rheological properties inferior dispersion of particle s and air bubbles reagents-mineral interactions bubble-mineral interactions SEM of fibers (fibrous ore ), taken from suspension

7 Correlation of Rheological Properties to the Processing Efficiency
Rheological properties of pulp is affected if it contains particles of fibrous morphology Processing efficiency is significantly affected by the rheological properties of suspension Reagents can negate the chemical factors contributing to rheology

8 Effect of Particle size (Aspect ratio [AR]) on Rheology of Suspension
Video on Pulp Rheology Aspect ratio = Rheological properties of suspensions are significantly affected with particle size (fiber length)

9 Summary and Conclusions
Rheological properties of suspension Severely affected by Fibrous morphology – even at small concentrations of fibrous particles Dependent on Length of the Fiber Diameter/thickness of the Fiber Strength of network formation by fibrous particles Processing efficiency can be improved Addition of chemical reagents Can improve rheology of mineral suspension

10 Future plans Acknowledgements Cytec Industries, Inc. Vale Inco
Additional physicochemical aspects to be studied Surface chemical properties Rugosity of particles Particle-particle and particle-reagent interactions Rheological model to relate experimental results Conduct fundamental and applied studies Conduct solution chemistry studies to determine species responsible for adverse affect on rheology and separation efficiency Correlate rheological results to the selective separation of valuable minerals Acknowledgements Cytec Industries, Inc. Vale Inco

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