Agglomeration Processes: Phenomena, Technologies, Equipment by Wolfgang Pietsch

By Wolfgang Pietsch

Agglomeration is imperative to the strategies of amendment of powders, creation of composites and construction of recent fabrics that are required in prescription drugs, meals, chemical substances, fertilizers and agrochemicals, minerals, ceramics, metallurgy and all fabric generating industries. The binding mechanisms and the particle habit in addition to the features of the strategies and the ensuing agglomerates are an identical whether or not they are occuring within the 'ultra-clean' pharmaceutical or nutrients industries or in 'dirty' minerals or waste processing plants.

The booklet introduces the interdisciplinary method of the improvement of recent ideas and the answer of difficulties. it's a whole and up to date useful consultant describing a number of the agglomeration phenomena and commercial thoughts for measurement growth. as well as introducing the homes of agglomerates and the features of the various tools, descriptions of the equipment and discussions of particular gear positive aspects are the most topics.

The designated evaluate of the topic relies at the authors adventure as pupil, researcher, instructor, developer, clothier, seller, and consumer in addition to professional and advisor within the box of agglomeration, its applied sciences and items, and is complemented via the information of co-workers who're lively in particular components and knowledge from proprietors. it really is meant for everyone operating in industries that procedure and deal with particulate solids because it goals to assist comprehend and keep an eye on undesirable agglomeration in addition to use, increase, and improve tools for the priceless measurement growth by means of agglomeration.

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B. , Hydrogen bridges betweenoxygenand hydroxyl radicals a: Association - H interacts with nonbinding electron pair of oxygen b: Water molecules intensify association c: Bridging by nonvalence association of bipolar (water) molecules Electrostatic Forces 2. -_-_-- Fig. a) Van-der-Waals forces are naturally occurring forces at the surfaces of all solid materials. The molecules, atoms, or ions in the interior of a solid interact with each other such that they retain their relative, equilibrium positions.

However, they can contact and penetrate each other. It can be assumed that molecular forces can be fully transmitted if the adsorption layer is thinner than 3 nm. Such forces are often high enough to cause deformation of solid particles at the contact points (Fig. 9) thus increasing the contact area and, therefore, strength of the bond between adhering partners. 14, pp 97-1291. I 37 38 I 5 Agglomeration Theories X Fig. 9 Viscoelastic deformation at the contact point between tW0 glass spheres due t o molecular attraction.

5 Agglomeration Theories Fig. 2 Photograph of urea prills (courtesy KaltenbachThuring, Beauvais, France). I 31 32 I 5 Agglomeration Theories Fig. 3 Photograph o f the discharge end o f a pastillator also showing pastillated product (courtesy Berndorf Band, Berndorf, Austria). 1). In the following only size enlargement by agglomeration will be covered. 1 The Development of Strength o f Agglomerates Fig. 4 is the random cut through part of an agglomerate. Obviously, in reality, the structure is three dimensional.

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