Solids mixing equipment selection

Performance Characteristics Before selecting solids-mixing equipment, a careful study should be made of various performance characteristics. These are given here. 

Mixing of sohds is an important unit operation in the production of solids with consistent properties. A number of properties of the solid particles influence the mixing process, the design, and selection of mixing equipment. The second subsection elaborates on the theoiy of mixing, types of mixing equipment, and their operation. 

A selection chart for solids mixing equipment is given by Jones (1985). 

In the following sections we provide several design guidelines and examples of the selection, design, and operation of equipment for solid-hquid mixing. 

Binder liquid should wet the solid particles and not the interior walls or the mixing tools of the equipment. If parts of the mixer are wetted, build-up occurs which is difficult to remove. Different spray patterns are available with commercially available single or two phase nozzles (Fig. 7.22c and 7.23) and a suitable pattern should be selected to assure that liquid impinges only on the moving powder. Since the spray pattern depends critically on the cleanliness of the orifice area, as mentioned before, nozzles must be drip free and installed such that they remain clean or are blown free by the action of atomizing gas. This is particularly important for low capacity nozzles which are often preferred because the binder liquid should be always completely ab-... 

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