Pusher centrifuge is a continuous filtering device used for solid-liquid separation which finds extensive use in chemical, pharmaceutical, food (common salt) and mineral industries. Pushers have been in use for more than half a century for dewatering relatively large, free-draining crystals and other solids.

Various types of centrifuges are available in the market, and each type has certain advantages over a specific range of process variables. Pusher Centrifuge has been known to be highly effective for feeds of wide ranging solid-content with particle size varying from 80 microns to a few mm.

The pusher centrifuge is, as the worm/screen type centrifuge, a continuously operating filtration centrifuge. The size of the separated solid particles will be preferable > 80 µm. The solids will be retained as a cake on a wedge wire basket and transported by an oscillating step by step movement of the inner basket axial in the direction of the solid discharge. The application of a pusher centrifuge is especially then advantageous, when based on the product characteristics, a high wear of all product contacting parts is expected, a long retention time of the solids is required or loss of solids in the filtrate, crystal breakage and abrasion should be low.

In addition a very intensive washing of the solid cake and, if required, a separate discharge of the solid cake and a separate discharge of mother liquid and washing liquid is possible