Process for the production of fine, ceramic pressing granulate by fluidised-bed drying.

摘要

The invention relates to a process for the production of fine ceramic pressing granulate by fluidised-bed drying, with the granulate produced being suitable for subsequent shaping by pressing. This is achieved according to the invention by there being added to the fine ceramic slip, for fluidisation, appropriate fluidisers and, as binders and pressing aids, polyvinyl alcohol (PVA), polyvinylacetate (PVAC) and polysaccharide/acrylic acid (PS/AC) in amounts of from 0.4 to 1.5% by mass, based on the dry solids content of the slip, in the ratio PVA : PVAC : PS/AC = (40 +/- 20) : (50 +/- 25) : (10 +/- 10) % in such a way that the slip has a moisture content of (38 +/- 3) % and a density of (1600 +/- 50) g/l and that the inlet air temperature of the heat transfer medium to the fluidised-bed drying of fine ceramic pressing granulate is from 180 to 250@C and the outlet air temperature is from 40 to 100@C.