Color pigments are among the most complex end products in the chemical industry because fine grinding of the pigments makes very high demands on the machine technology used when processing them. Finest and absolutely spatter-free end grain sizes, batch and contamination-free product processing as well as fast and thorough cleaning facilities when changing products are the normal minimum requirements. The dry solids content is also decisive in determining the quality of the final product. This is where the filter press comes into play: The best possible mechanical dewatering of ground and classified pigments can be achieved on membrane filter presses. Low operating costs over a long service life, little effort for service and maintenance work and brief downtimes during maintenance work are some more of the advantages offered by a filter press.
The filter press operates in a batch-type process, however the latest developments and research in the IIoT and Industry 4.0 sector can be configured more efficiently in the form of an “intelligent filter press” and enable operations ranging from semi-continuous to fully automatic. This paper describes the features of a membrane filter press, using a process for the production of calcined kaolin and the latest developments in the direction of an intelligent filter press – and how it can optimize pigment production – as an example.
Taking a look at dewatering, an important step at the heart of the colour pigment production process. By using a method for a calcined kaolin pigment as an example, we explain how an intelligent filter press can improve pigment production.