After the damp raw material is put into the drier from on end,it is turned over through strring-up rake inside the cylinder and distrbuted uniform in the drier and comtacted with countercurrent hot air fully.It speeds up heat and mass conducting of dry.During the oeriod of dry,it can be moved and passed through the dry region and to star valve and then dischareg the finished product.

　It is suitable for drying raw materials that have large size and heavy specific
gravity.For example;ore,slag of blast furnace,coal,metallic powder,phosphorus fertilizer,ammonium sulphate and so on.
　Dry powder,granule rae materiels which have special requirments to drying.
For example:HP vesicant,less,light calcium carbonate,active white earth,magnetic powder,graphite,medical slag and so on.
　Dry raw materials that need to dry at low temperature continuously and its bath is large.