Agglomeration in Industry: Occurence and Applications, Vol. by Pietsch W.

By Pietsch W.

This two-volume paintings, in addition to Agglomeration processes—phenomena, applied sciences, apparatus (Wiley: 2002), offers an entire evaluation of the sector. Early chapters in short describe the basics; the rest textual content describes the prevalence of agglomeration in undefined, business functions of dimension expansion via agglomeration, and different makes use of of particle adhesion. The industries for which functions are defined comprise pharmaceutical, chemical, nutrition, animal feeds, fertilizers and agrochemicals, construction fabrics and ceramics, mining, metallurgical, sturdy fuels, and powder metallurgy. Chapters are supplied on purposes in environmental regulate, together with recycling of polymers, recycling of secondary uncooked fabrics, and dimension growth for the stabilization and disposal of particulate stable wastes. functions also are defined for commercial improvement, troubleshooting and optimization, and for unmarried debris and nanotechnology. An exhaustive bibliography and checklist of owners are integrated. Pietsch has been a consultant in mechanical method expertise in given that writing his dissertation on the Technical U. of Karlsruhe (Germany) in 1965

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8). While for some applications it is important to know the force causing final catastrophic failure, particularly in such cases where the production of fines from brittle agglomerates must be avoided during handling, the first indication of partial breakage could be selected to determine the strength. This opens the reporting of test results to a wide range of operator-dependent interpretations. Although knowledge and understanding of the fundamentals of agglomeration, particularly the nature and effect of the binding mechanisms and how they can be influenced, become more and more important during the development of new and for the optimization of existing agglomeration processes, agglomeration as a unit operation is still more an art than a science.

Agglomerates are formed in the freely moving charge of a tube mill by the compaction of fine particles between the grinding media and by recombination bonding (Chapter 5). Adhesion is affected by van-der-Waals forces between the particles that have been compressed very tightly and by the recombination of free valence forces at newly created surfaces. Since these agglomerates are very strong, a “grinding equilibrium” exists, which has been observed and described by many. It means that in fine grinding, after a certain time, a state of equilibrium between size reduction and size enlargement by agglomeration occurs.

3 summarize what has been discussed. Tab. 2 shows that some of the uncontrolled, natural agglomeration phenomena are not necessarily detrimental. Tab. 3 lists a few of the possibilities to avoid or at least lessen the effect of unwanted agglomeration. While undesired agglomeration is often very important, because its effects may result in considerable losses of production and profit, most of the past and present Tab. 3 Summary of some of the possibilities to avoid or at least lessen the effect of unwanted agglomeration Separation Mixing Dry/moist Wet Comminution Agglomeration Transportation Storage Remove or “scalp-off” fines (immediately) at the source.

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