Method of improving siliceous filter aid dispersion in wet process orthophosphoric acid production systems

摘要

A process is disclosed for improving the dispersability of siliceous (preferably diatomite) filter aid particles in hot (i.e., 140° F. or higher) aqueous acid systems used in the "wet process" formation of orthophosphoric acid from phosphate rock. In this process the filter aid particles are prewetted with water to cause the adsorption of 15 to 75 weight percent of water on the filter aid prior to dispersing the prewetted filter aid in the acid system.