HAZEMAG rapid dryers demonstrate the advantages of short-retention and uniflow drying in a most emphatic way, achieving an exceptional degree of effectiveness. Short-retention drying in the rapid dryer is characterized by the combined effects of mechanical turbulence of the feed material by agitator paddles and the simultaneous exposure to hot gases, promoting a quick, safe and intensive drying process. With the uniflow system, the wet (feed) material and the hot gases flow through the dryer in the same direction, the advantage being that high hot gas temperatures can be applied without any deleterious effects on the feed material. When the hot gases come into contact with the wet material, intensive moisture evaporation is coupled with a simultaneous drop in drying gas temperature. The rapid dryer is particularly effective when used to dry wet, plastic clay or problematic “filter cake” which has already been dewatered mechanically by belt filter, filter press, drum filter or centrifuge – flue gas gypsum, chemical gypsum, chrome hydroxide, for example. The material is broken up into small lumps, presenting a large surface area which permits intensive transfer of heat and matter.