Washing After intermediate centrifugation, the wash liquid is applied evenly to the product cake; this liquid enters the centrifuge via the feed disk or the wash pipe.
Dry-centrifugation After washing, centrifugation takes place – until the required residual moisture content in the filter cake is achieved.
Scraping, solids discharge At reduced speed, the scraper knife swings into the filter cake and scrapes out the product vertically downward. If required, the residual heel removal on the scraper device can be switched on during scraping.
Residual heel removal A residual heel is left on the filter cloth, to protect the cloth during scraping. The heel can be used to prevent fine content in the filtrate passing through the filter cloth during subsequent batches. The residual heel is removed after each batch, or periodically, to suit the specific application. The heel can be blown into the solids discharge using pressurised gas pulses applied via nozzles outside the basket or, if necessary, additionally via nozzles on the scraper device. If the process area is purged with inert gas, nitrogen is used for blowing off the heel