... is also strengthened. At the bottom of the dryer, large and damp, lump granules are crushed under the action of ... very short, high efficiency, high drying speed, small equipment, large out put can be achieved. There are elutrating rings and ... , calcium carbonate , hydroxide, copper sulfate, ferric oxide , barium carbonate , antimony trioxide, all kind of heavy metallic salt, synthetic cryolite and so ...