Anodes for magnesium electrolytic cells
Graphite anodes and bars are used in the magnesium industry.
|
Properties |
Units of measurement |
Typical values |
|
|
Grade |
|
BV |
BN |
|
Specific electrical resistance |
µОhm·m |
6.5 |
5.5 |
|
Compression strength |
MPa |
25 |
34 |
|
Flexural strength |
MPa |
14 |
17 |
|
Bulk density |
g/cm3 |
1.65 |
1.76 |
|
Real density |
g/cm3 |
2.24 |
2.24 |
|
Total porosity |
% |
25 |
21 |
|
Open porosity |
% |
22 |
14 |
|
Heat conductivity at 20°C |
W/m•K |
130 |
190 |
|
Linear thermal expansion coefficient, (20-520) °C |
10-6 •K-1 |
2.4 |
2.3 |
|
Ash content |
% |
0.2 |
0.2 |
The above values are average values and they do not constitute a specification.
BV is a grade of bars, recommended preferably for use in top-mounted anodes;
BN is a grade of bars, recommended preferably for use in bottom-mounted anodes.
|
|
Maximum dimensions, mm |
Standard tolerances, mm |
|||
|
Width |
330 |
375 |
412 |
340 |
±5* |
|
Height |
150 |
200 |
±5* |
||
|
Length |
2250 |
+50* |
|||
* - partial machining;
** - full machining.
Anodes are complete with commercially produced bars 330 mm, 375 mm and 412 mm wide with the maximum anode width of 2246 mm. Standard tolerance on the width of the anode depends on the number of the bars.
Protection of top-mounted anodes against air oxidation is ensured by impregnation of a current-conducting part of the anode with metaphosphate melts and other compounds.
Anodes can be supplied in a set together with the bars or glued.
The chief expert in anodes for magnesium industry and electrode pastes can be reached at chedrekie@ukrgrafit.com.ua.