Manufacture of Expanded Products

The processing of the raw materials is different for plastic clays and lumpy shale. Plastic clays are crushed, ground, mixed, partially dehydrated and then formed into pellets of different sizes on a granulation table or similar apparatus before being thermally treated (half-wet process). Lumpy raw materials, such as shale, are only ground and, if necessary, classified (dry process) before thermal treatment. Adjustment of the bulk density of the final product to the required value is carried out during the subsequent thermal treatment. 

The thermal treatment is carried out using different processes  

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