PROCESS FOR PRODUCING ALUMINIUM HYDROXIDE WITH GRAIN DIAMETER LESS THAN 20 MICROMETERS UP TO 20 PER CENT

摘要

A sludge of alumina and caustic NaO2 soln. (135-155g/l) is mixed and heated. 30-70 m2Aluminium hydroxide/l of sludge, comprising min. 80% grain size above 45 microns is separated by controlled cooling at a rate of 0.05-0.2 deg.C/hour.