SIZE MATTERS, WEIGHT TOO – DISC FILTER DESIGN FOR THE FUTURE

Hahn, J., Bott, R., Langeloh, L.

Filtration of coarse and fine seed downstream the secondary or tertiary thickener or in continuation of hydrocyclones, respectively, influence the effectiveness, the operational cost and the quality of the final product in Alumina precipitation plants remarkably. Seed filtration is characterised by the tremendous flow rates which have to be processed on the filters and by changing product characteristics such as slurry density or grain size etc. Consequently, the used filtration equipment must ensure a high availability and has to be capable to cope with high slurry feed rates and with slurry characteristics which can change in a wide range during filter operation. With the introduction of the Boozer disc filter two decades ago BOKELA have set a new standard in seed filtration with decisively improved filter capacity and reduced maintenance and operation cost. Now, BOKELA have redesigned and upgraded this disc filter type. The new design improves filter operation, filter maintenance and economy (OPEX and CAPEX)