Size Enlargement Solids Pelleting

W. Pietsch, Erwiinschte Agglomeration mit Granulatformmaschinen. (Wanted agglomeration with pelleting machines.) Maschinenmarkt MM - Industriejournal 77 (1971)10, 193-196. W. Pietsch, Size enlargement of solids. Particulate Matter (Bulletin of the Powder Advisory Center) 2 (1971)1, 15-22. 

Catalysts used in industrial processes, whether made from the active substance directly or deposited on carriers, are often porous cylindrical pellets produced by medium pressure extrusion (Fig. 5-10bl-b6, Chapter 5). While almost all methods of size enlargement by agglomeration can be used to produce porous bodies from solid powders and post-treatment processes can yield strong pieces with a high accessible internal porosity [B.23, B.78, B.97] that fulfill the previously discussed requirements, pelleting offers a number of advantages. 

FIG. 20-79 Effect of pelleting pressure on axial crushing strength of compacted calcite particles of different sizes demonstrating existence of a critical yield pressure. Inset shows the effect of hardness on critical yield pressure. [Benhow, Enlargement and Compaction of Particulate Solids, Stanley-Wood (ed.), Butteixooiihs, 169 (1.9S3),]... 

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