Bottom blocks

Bottom blocks are used for lining the bottoms of aluminium electrolytic cells 

 

 

Properties

Units of measurement

Typical values

Grade

 

PB3

PB10

PBG

PBG2

Graphite content

%

30

100

graphitized

graphitized

Real density

g/cm3

2,00

2,15

2,22

2,22

Bulk density

g/cm3

1,58

1,62

1,61

1,73

Total porosity

%

21

 

 

 

Open porosity

%

16

20

22

17

Specific electrical resistance

µОhm•m

27

19

10

10

Heat conductivity

W/m•K

12

30

110

120

Compression strength

MPa

35

35

23

32

Flexural strength

MPa

11

13

14

16

Modulus of elasticity (Young's modulus) *

GPa

7

7

7

7

Rappoport's relative elongation in cryolite-alumina melt*

%

0,4

0,1

0,1

0,1

Linear thermal expansion coefficient  (20-520) °C

10-6•K-1

2,2

3,0

2,7

3,5

Ash content

%

2,0

0,3

0,1

0,1

 

 * - perpendicular to the direction of extrusion. The above values are average values  and they do not constitute a specification.


Bottom blocks are manufactured on the basis of electrically calcined anthracite.

 

Dimensions of bottom blocks

Maximum dimensions, mm

Standard tolerances, mm

Width

720

± 3

Height

490

± 3

Length

3980

± 5

Groove

rectangular

trapezoidal

cylindrical

 

 

 

 

 

 

The chief expert can be reached at hlopkov@ukrgrafit.com.ua.

 

 

 

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