The raw materials to be treated should distribute on the
conveyer belt though suitable mechanism such as star distributor,
swing belt crusher or granulator. The con veyer passer though the
channel consisting of one or several heating unit. Each heating
unit is equipped with air heat and circle Each channal has one or
several damp discharge systerms. When the converyer passes through
it, hot air will pass through the raw material from up to low or
from low to up. In this way raw materials can be dried
evenly.