model

 direct heating direct heating clockwise flow spec clockwise flow spec

 heat directly countercurrent spec

 complex heat

 kinds of raw material

ore

 vesicant

ammonium sulphate

coal

 amount to be treated Kg/h 

1000

466

20000

5000

 primary moisture % 

30

13

1.5

6.5

 final moisture % 

15

0.3

0.1

0.1

average diameter(mm)

6.5

0.05

0.5-0.7

5

 bulk density of rawmaterial kg/m

770

800

1100

750

amount of hot air (m⁵/kg)

39000

5400

9800

16000

temperature of air at inlet(°C)

600

165

180

570

 temperature of raw material at outlet)

42

70

75

way of heating

gas

electric heating

coalfuel hot air furnace

 heavy oil

loading effciency %

6.3

7.5

18

revolution r.p.m

4

4

3

2

grad ient m/m 

0.04

0.005

0.05

0.043

quantity of stirring-up rake

12

24

22

6

12

diameter of dryer m

2.0

1.5

2.3

2.  0.95 outer cylinder24, inner cylinder0.95

length of dryer m

20

12

15

16

driving power(kw)

22

7.5

11

15