Advances in Fine Particles Processing - Attia, Yosry A.

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Résumé :
Processing of fine particles has presented numerous challenges to scientists and engineers for many years. Considerable progress has al ready been made in meeting these challenges across various fields of applications around the world. Research on every aspect of fine particle processing has gained momentum in recent years, resulting in the development of new processes, improved products, and better understanding of the science and engineering fundamentals of fine particles. This symposium addressed the recent progress in fine particles processing, particularly in the production of minerals for chemicals, pigments and metal production, ceramic materials, and fossil fuels. This book represents the edited proceedings of the International Symposium on Advances in Fine Particles Processing, where selected peer-reviewed papers describe current practices, review the state of the art and report original fundamental and applied research on fine particle production, sizing, characterization of the interface, fluid flow, and interparticle colloidal interactions, leading to dispersion, flocculation and flotation. Processing of fine particles by multi-chemical, physical and biological phenomena has also been addressed. Accordingly, the book consists of seven parts, with each part addressing a specific topic. Part One deals with production of fine particles by comminu? tion methods where different milling practices, mathematic modeling and physical? chemical control methods are reported. Part Two covers particle flow properties in various fluids. Part Three addresses surface and colloidal phenomena in fine particle processing, while Part Four continues this topic but with emphasis on clay minerals.

Sommaire:
1. Production of Fine Particles by Comminution.- Comminution Energy Reduction by Two-Stage Classification.- Power Requirements for Ultrafine Grinding and Drying of Low-Rank Coals in a Fluid-Energy Mill.- Problems Inherent in Using the Population Balance Model for Wet Grinding in Ball Mills.- Correlation of Adsorption of Surfactants with Fracture and Grinding of Quartz.- Comminution and Ash Reduction of Coal Particles.- 2. Sizing, Mixing and Flow Properties.- Rheology of Concentrated Suspensions.- Rheological and Transport Analysis of Micronized Coal-Water Suspensions Prepared in Conventional and High-Speed Stirred Ball Mills.- Velocity of Variously Shaped Particles Settling in Non-Newtonian Fluids.- Detailed Flow Patterns in the Cylindrical Cyclone Dust Collector.- Universal Blender for Cohesive and Free Flowing Powders.- 3. Surface and Colloidal Phenomena in Fine Particle Processes.- The Role of Particle Forces in Determining the Rheological Properties of Concentrated Dispersions.- Selective Separation of Fine Particles at a Charged Solid/Liquid Interface.- Adsorption of Collectors on Minerals Effects of Lateral Interaction and Molecular Size.- Adsorption and Wetting Characteristics of Pure Non-Metallic Minerals in Contact with Cationic Surfactants.- Surface Characterization of Surfactant-Modified Colloidal Alumina.- Fourier Bessel Characterization of Polished Metal Surfaces.- 4. Surface and Colloidal Chemistry in the Processing of Clays.- Interparticle Forces of Clays.- Application of SIMS to the Study of Polycation Adsorption on Kaolin.- The Behavior of Polyelectrolyte Adsorption on Kaolin.- Ultrasonic Gelling of Channelized 2:1 Clay In Ionic Media.- 5. Processing of Fine Particles by Flocculation and Dispersion.- Effects of Polyacrylic Acid Concentration on Its Conformation and on the Stability of Alumina Suspensions.- Shear Flocculation and Flotation of Galena and Synthetic PbS.- The Hydrophobic Aggregation Flotation of Rutile Particles.- Selective Flocculation of Chrysocolla Fines with Anionic Polyacrylamide/Acrylate Polymer.- Thermodynamics of Adsorption of a Hydrophobic Polymeric Flocculant on Coal, Pyrite and Shale Minerals.- Synthetic Copolymers Tailor-Made for the pH Controlled Selective Flocculation of Extrafine Dispersions of Ilmenite with Respect to Rutile.- Selective Deslimings of Fine Iron Ores Based on Aggregation Between Magnetite and Hematite.- 6. Separation of Fine Particles by Flotation.- High Speed Photographic Investigation of Coal Flotation.- A Study of Surfactant/Oil Emulsions for Fine Coal Flotation.- Sequential Separation of Carbonate and Siliceous Gangue Minerais During Phosphate Ore Processing.- Split Flotation of Calcite from Wollastonite and Microcline The Calcite Rich Wollastonite Ore of Northern Sweden.- Operating Parameters in the Column Flotation of Alabama Oil Shale.- 7. Fine Particle Processing with Multiple Physical, Chemical and Biological Phenomena.- Grinding and Flotation Characterized with the Parameter Action.- Upgrading Fine-Grained Iron Ores.- Processing of Hematitic Iron Ores.- Ore and Coal Processing with the Turbocharger Electrostatic Separator.- Biometallurgy for Manganese and Copper Ores.- Silver Recovery Through Molten Salt Destruction of Sludges and Other Solids.- Pilot Scale Ferrous and Sulfide Metals Treatment in Wastewater Cleanup.- Author Index.