Computer technology in the past fifteen years has essentially rev olutionized engineering education. Complex systems involving coupled mass transport and flow have yielded to numerical analysis even for relatively complex geometries. The application of such technology together with advances in applied physical chemistry have justified a general updating of the field of heterogeneous kinetics in extractive metallurgy. This book is an attempt to cover significant areas of extrac tive metallurgy from the viewpoint of heterogeneous kinetics. Kinetic studies serve to elucidate fundamental mechanisms of reac tions and to provide data for engineering applications, including improved ability to scale processes up from bench to pilot plant. The general theme of this book is the latter-the scale-up. The practicing engineer is faced with problems of changes of order of magnitude in reactor size. We hope that the fundamentals of heterogeneous kinetics will provide increasing ability for such scale-up efforts. Although ther modynamics is important in defining potential reaction paths and the end products, kinetic limitations involving molecular reactions, mass trans port, or heat flow normally influence ultimate rates of production. For this reason, rate processes in the general field of extractive metallurgy have been emphasized in this book.

Klappentext

Computer technology in the past fifteen years has essentially rev­ olutionized engineering education. Complex systems involving coupled mass transport and flow have yielded to numerical analysis even for relatively complex geometries. The application of such technology together with advances in applied physical chemistry have justified a general updating of the field of heterogeneous kinetics in extractive metallurgy. This book is an attempt to cover significant areas of extrac­ tive metallurgy from the viewpoint of heterogeneous kinetics. Kinetic studies serve to elucidate fundamental mechanisms of reac­ tions and to provide data for engineering applications, including improved ability to scale processes up from bench to pilot plant. The general theme of this book is the latter-the scale-up. The practicing engineer is faced with problems of changes of order of magnitude in reactor size. We hope that the fundamentals of heterogeneous kinetics will provide increasing ability for such scale-up efforts. Although ther­ modynamics is important in defining potential reaction paths and the end products, kinetic limitations involving molecular reactions, mass trans­ port, or heat flow normally influence ultimate rates of production. For this reason, rate processes in the general field of extractive metallurgy have been emphasized in this book.

Inhalt

1. Fundamentals of the Kinetics of Heterogeneous Reaction Systems in Extractive Metallurgy.- 1.1. Elementary Steps.- 1.2. Reaction of a Single Nonporous Particle.- 1.3. Reaction of a Single Porous Particle.- 1.4. Reactions between Two Solids Proceeding through Gaseous Intermediates.- 1.5. Notation.- References.- 2. Rate Processes in Multiparticle Metallurgical Systems.- 2.1. General Approach to Describing Rate Processes in Multiparticle Systems.- References.- 2A. Chemical Process Analysis and Design for Multiparticle Systems.- 2A.1. Introduction.- 2A.2. The Concept of General Reactor Scale-up Criteria.- 2A.3. Computed Dimensionless Design Curves.- 2A.4. Application of F Curves in Process Design.- 2A.5. Application Examples.- References.- 3. Hydrometallurgical Processes.- Sec. 3.1. Milton E. Wads worth.- Sec. 3.2. Milton E. Wadsworth.- Sec. 3.3. J. D. Miller.- 3.1. Principles of Leaching (MEW).- 3.2. Dump and In Situ Leaching Practices (MEW).- 3.3. Cementation (JDM).- References.- 4. Pyrometallurgical Processes.- Sec. 4.1. S. E. Khalafalla.- Sec. 4.2. J. W. Evans and C.-H. Koo.- Sec. 4.3. H. Y. Sohn and E. T. Turkdogan.- Sec. 4.4. I. B. Cutler.- Sec. 4.5. E. T. Turkdogan.- Sec. 4.6. C.H.Pitt.- 4.1. Roasting as a Unit Process (SEK).- 4.2. The Reduction of Metal Oxides (JWE and CHK).- 4.3. Calcination (HYS and ETT).- 4.4. Sintering (IBC).- 4.5. Smelting and Refining (ETT).- 4.6. Zone Refining (CHP).- References.- 5. Melting and Solidification in Metals Processing.- 5.1. Introduction.- 5.2. Melting and Solidification Problems Involving One-Component Systems.- 5.3. Melting and Solidification of Multicomponent Systems.- 5.4. Some Techniques of Solution and Computed Results for Melting and Solidification Problems.- 5.5. Concluding Remarks.- Suggested Reading.