Freeport Minerals Company

Robert J Sweeney

Donald L Chamberlain

Tilting filter pans is disclosed having generally parallel leading and trailing sidewalls which are sloped at an angle to permit increased filtration rates for a predetermined filtering efficiency, and also to permit increased filtering efficiency where the feed rate is constant. The feed is a slurry from which the liquid is removed, and the filter cake being dumped by rotation of each filter pan at a predetermined point of movement of the filter pan along a cyclical path. Hold-down devices having a reduced volume are also used in combination with the improved pan design, so that an increased filtration rate is possible due to decrease in the required filter cake height. A cam arrangement is provided for turning the pans with minimum stress in a minimum length of pan travel, while avoiding collisions between adjacent pans and while permitting washing of each pan.

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Gonzales, LA, United States of America

Robert J Sweeney