|| || ||
Frothing in Flotation II (Recent Advances in Coal Processing , Vol 2)
by Janusz S. Laskowski (Editor), E.T. Woodburn (Editor)
Designed to assist in the understanding of phenomena that take place in froth & in the interpretation of visual froth images in flotation as well as to encourage the development of optimal procedures for flotation through the regulation of the froth structure.
J.A. Frew, 7 Wilgra Avenue, Ashburton, Vic. 3147, Australia
This book aims to cover the developments that have taken place since 1989 in the understanding of the effects of froth structure on mineral separation. It has eleven chapters that have been written by experts in the field from Canada, Russia, Poland, South Africa, Australia and United Kingdom. This ensures both a wide range of subject matter and a breadth of perspective. The material is presented in eleven chapters:
1. Frother and Frothing
A review of the latest developments in frothability, frother-collector interactions, effects of frothers on kinetics, comparison of frothers, and distinction between froth behaviour in mechanical cells and columns.
2. Effect of Particle and Bubble Size on Flotation Kinetics
Modelling of the effects of particle and bubble size on flotation kinetics as illustrated by laboratory experiments on pyrite and coal flotation.
3. Water Contents and Distribution in Flotation Froths
Direct measurement of the water content and its distribution in foams including the effects of gas flow and frother concentration.
4. Mechanisms Operating in Flotation Froths
A review of the mechanisms operating in flotation froths and how they interact.
5. Characterisation of Flotation Froth
An investigation into the carrying capacity, the role of hysteresis phenomena, the effect of water content, and the strength of flotation froths.
6. Simultaneous Determination of Collection Zone Rate Constant and Froth Zone Recovery Factor
A laboratory flotation column was used to determine both the pulp phase and the froth phase performance of an industrial stream by operating co-currently and counter-currently. The influence of wash water flow rate, air flow rate, froth depth and collector dosage was determined.
7. Modelling of Froth Dynamics with Implications for Feed-Back Control
The development and validation of a two-dimensional kinematic of bubble transport through the froth. The model incorporates bubble coalescence and deformation.
8. The Interrelationship between Flotation Variables and Froth Appearance
The application of a machine vision system to assisting operators in controlling two flotation circuits of precious metal plants in South Africa.
9. Froth Image Analysis in a Flotation Control System
Laboratory and plant experiments on the use of froth image measurements to determine metal content in base metal rougher and cleaner flotation.
10. Kinetic Flotation Modelling using Froth Imaging Data
The use of a kinetic model based on the measured flux of bubble surface overflowing the weir to describe laboratory coal flotation. The model allows the relative contributions of the selective attachment and entrainment mechanisms to be determined.
11. Dependence of Froth Behaviour on Galvanic Interactions
Laboratory study that demonstrates that flotation recovery of a valuable mineral is not merely a function of galvanic interaction with the mineral, but also strongly dependent on the effect of galvanic interactions.
There have been important recent developments especially in the areas of modelling and the use of froth appearance. These are well covered in this volume and yet there is sufficient background material presented for this to serve as a stand-alone text on the subject. Although it forms part of a series on Recent Advances in Coal Processing, the material will appeal to all readers interested in froth flotation. The material in the book is clearly presented with ample references at the end of each chapter and an index. It is warmly recommended.
Information about Amazon.com:
Safe Shopping Guarantee
Frequently Asked Questions