Method for using fracture resistant electrodes in a...

Details Method for using fracture resistant electrodes in a... Method for using fracture resistant electrodes in a...

2008-09-18

2010-06-15

Wyszomierski, George (Department: 1793)

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

C204S280000

Reexamination Certificate

active

07736413

ABSTRACT:
Graphite electrodes for the production of aluminum by carbothermic reduction of alumina are either submerged in the molten bath in the low temperature compartment or they are horizontally arranged in the side walls of the high temperature compartment. The electrodes are manufactured by using a mixture of coke particles covering the complete particle size range between 25 μm to 3 mm and by using an intensive mixer to effectively wet all coke particles with pitch. The electrodes have a flexural strength of at least 20 N/mm2. By using a complete range (continuum) of particle sizes in conjunction with an intensive mixer, the geometric packing of the particles is significantly improved, hence the material density is increased and thus a higher mechanical strength as well as improved electrical conductivity in comparison to conventional graphite electrodes is achieved.

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Marshall J. Bruno: “Aluminum Carbothermic Technology Comparison to Hall-Heroult Process”, Light Metals 2003, Pennsylvania, USA, pp. 395-400.

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