Alumina production (3)

Table 4   Aluminum mineral list

Serial number

name

Molecular formula

Relative molecular mass

Quality /%

Density / ( g / cm 3 )

Moh's hardness

Al 2 O 3

H 2 O

SiO 2

Na 2 O

K 2 O

SO 3

1

Gibberite

Al 2 O 3 · H 2 O

120

85

15

 

 

 

 

3.01~3.5

3.5~7.0

2

Gibbsite

Al 2 O 3 ·3 H 2 O

156

65.4

34.6

 

 

 

 

2.35~2.42

2.5~3.5

3

Nepheline

Na 2 O · Al 2 O 3 · 2SiO 2

284.2

35.9

 

42.3

21.8

 

 

2.63

5.5~6.0

 

 

K2O · Al 2 O 3 · 2SiO 2

316.4

32.2

 

38

 

29.8

 

2.4~2.6

6

4

Alum

K 2 SO 4 · Al 2 ( SO 4 ) 3 · 4Al ( OH ) 3

838.2

36.9

13.05

 

 

11.4

38.65

2.6~2.8

3.5~4.0

5

Corundum

Al 2 O 3

102

100

 

 

 

 

 

4~.1

9

6

Kyanite

Al 2 O 3 · SiO 2

162.1

62.9

 

37.1

 

 

 

3.56~3.68

4.5~7.0

7

Andalusite

Al 2 O 3 · SiO 2

162.1

62.9

 

37.1

 

 

 

3.15

7.5

8

Red line stone

Al 2 O 3 · SiO 2

162.1

62.9

 

37.1

 

 

 

3.24

7

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