Flottweg manufacture horizontal DECANTER centrifuges for continuous two phase separation (liquid from solids) and three phase separation (2 solids and one liquid or two liquids and one solid). Applications are as varied as thickening and dewatering sludge, suspensions with granular solids, clarification of liquids, classification of fine pigments, separation of plastics and separation of organic/aqueous mixtures. Flottweg provides a broad range of DECANTER sizes, from pilot scale or small production up to industrial scale with capacities of 250 m³/h.
There are four types of decanter centrifuges available:
Separation of solids from liquids (dewatering of sludges, crystals, muds)
Separation of two liquids of differing densities and one solid (SX Crud removal, fish oil clarification, crude oil sludge processing)
Separation of “soft” solids (such as proteins, yeast, bacteria, algae)
Separation of two solids of differing densities and one liquid (sorting recycled plastics such as HDPE and LDPE)
Mode of operation
The essential part of the decanter is the rotating part which consists of a cylindrical/conical bowl with a conveyor scroll inside which rotates at a differential speed. The rotating part is driven by electric motors via belt transmission. Feed enters the bowl through a central feed pipe. Through ports in the scroll body, feed passes into the bowl where separation by centrifugal force takes place. In a decanter, the product is separated into a liquid phase and a solids phase. The discharge of the separated liquid can be under pressure or by gravity. The separated solids are conveyed by the scroll to the conical end of the bowl and are discharged. Decanters can also be configured for gas tight operation as may be required for toxic or explosive materials.