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.