LEAF FILTER TEST METHOD FOR DETERMINING FILTRATION CHARACTERISTICS OF A FIBROUS SLURRY AND APPARATUS FOR PERFORMANCE THEREOF

摘要

LEAF FILTER TEST METHODFOR DETERMINING FILTRATION CHARACTERISTICSOF A FIBROUS SLURRY AND APPARATUS FOR PERFORMANCE THEREOFAbstract of the DisclosureA simple and rapid leaf filter test, and an apparatusfor use therein, is described for measuring the filtration,or drainage, characteristics of a fibrous slurry. The testcomprises submerging the filter leaf in the slurry, applyinga partial vacuum to the leaf to build up a layer of solidson the leaf, removing the solids-coated leaf from the slurry,drying and weighing the solids collected, and then determiningfiltration characteristics (e.g., filtration rate) by meansof a predetermined formula. The results obtained by thistest are accurately reproduced in production size systems,e.g., a wet process for the manufacture of asbestos-cementproducts such as sheet or pipe. The test utilizes a portable,light-weight leaf filter and can be run in 2-3 minutes.