By S. Ramachandra Rao (auth.)
th The know-how of foam flotation, invented within the early 20 century was once first used for the focus of sulfide minerals. when you consider that then it's been utilized for the processing of many nonsulfide ores as weIl, together with oxides, carbonates, silicates, soluble minerals like halite and sylvite and effort minerals like coal and bitumen. lately it's been used for numerous nonrnineral purposes, akin to waste water therapy, deinking of paper for recycling and source restoration from commercial wastes he know-how keeps to develop with new functions suggested each year. Flotation is predicated on chemical phenomena taking place on the interfaces, solid/water and air/water. floor Chemistry ideas have performed an important position within the improvement of flotation expertise. wisdom of aqueous answer chemistry and electrochemistry has extra to our knowing of the reactions in flotation platforms. Professor Jan Leja's booklet has weIl served researchers and scholars as they attempted to appreciate the chemistry of flotation, and it's a major contribution to the development of information. even though, because the e-book was once first released, new examine innovations and ever becoming details have made an replace important. The revised version compiled by way of Dr. S. R. Rao has introduced jointly primary features of the chemistry of flotation and the way they practice to sensible platforms. it's going to serve all who're operating within the zone of flotation and attracted to exploring new functions of flotation technology.
Read or Download Surface Chemistry of Froth Flotation: Volume 1: Fundamentals PDF
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Additional resources for Surface Chemistry of Froth Flotation: Volume 1: Fundamentals
Example text
Lin and Somasundaran (1972), Lin et al. (1975), and Gammage and Glasson (1976) have shown that a prolonged grinding causes major physical and chemical changes in the solid surface; it becomes progressively more amorphous. the crystalline lattice of layers underlying the surface becomes distorted, and polymorphic transformations may occur which may result in chemical reactions between solid and liquid constituents, At the same time, a continued wear of the grinding media takes place: rods. balls, and liners in the mills are progressively consumed.
Which function by neutralizing the large surface charge. which causes fine partieles to disperse by electrostatic repulsion. Among the conunon coagulants are lime, potash al um (potassium aluminum sulfate) and ferric sulfate. Details of the mechanism of the action of coagulation will be discussed in Chapters 5 and 6. 4. Basic SteJls in Flotation OJleration Introduction 13 In froth flotation, hydrophobic solid particles attach to air bubbles and are buoyed by these to the surface of the suspension.
As the mixture passes through a 3-6 stationary bl ades located within the mixer. the air is sheared into very small bubbles by intense agitation. It produces "microbubble" suspensions containing up to 30% - 60% air by voilime. The bubble suspension enters through the side of the colllmn, where the air bubbles are allowed to escape and rise upward to collide with the particles. In addition, flotation cells, which combine the principles of hydrocyclone and centrifuge have been developed. Medium size bubbles having 100-1000 Ilm diameters are generated by such devices.