The materials that are not suitable for the vacuum belt drying process are roughly the following:
1) Concentrate with a solid content of less than 20%. Due to the high moisture content of this kind of material, in addition to the easy flow and no skeleton support mentioned above, the evaporation time is too long, the energy consumption is wasteful, and the energy saving and emission reduction advantages of the equipment cannot be reflected.
2) A mixture containing particles or crystals and insoluble with a solvent. Most of these materials are mixtures obtained by centrifugation or pressure filtration. Since the bulk density of the raw material itself is too large, the fluidity is too poor to be fed normally.
3) A mixture containing a large amount of an oil solvent. Such materials may cause poor gas and oil separation during the drying process.
4) Heating the material at a temperature below 35 °C. Since the dynamic vacuum of the equipment cannot be satisfied, it is difficult for the adsorbed water in the material to evaporate.
5) A mixture containing a large amount of chemical components such as methanol and ethanol. Due to the too large contrast of the melting point conditions, the splash phenomenon in the vacuum drying process is severe and cannot be normally received.
6) Pure granules, pellets, powders and filter cake materials, such materials will cause the drying chamber to be broken and lack of fluidity when fed, so it is not suitable for vacuum belt drying.