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Graphitized cathode block having an abrasion-roof surface

A cathode block and graphitization technology, applied in the field of cathode blocks, can solve the problems of fragile coating, short service life, easy cracking, etc.

Inactive Publication Date: 2013-12-11
SGL CFL CE GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, such pure titanium diboride or coatings with a very high titanium diboride content are very brittle and therefore prone to cracking
Furthermore, the specific thermal expansion of these coatings is approximately twice as high as that of carbon, so that such cathode block coatings have only a short service life when used in molten salt electrolysis

Method used

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  • Graphitized cathode block having an abrasion-roof surface

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Embodiment Construction

[0057] figure 1 A cross section showing details of an aluminum electrolytic cell 10 with a cathode 12 simultaneously forming the bottom of a tank for the aluminum melt 14 produced during operation of the electrolytic cell 10 and for the Cryolite-alumina melt 16 above aluminum melt 14 . The anode 18 of the electrolytic cell 10 is in contact with the cryolite-alumina melt 16 . The tank formed by the lower part of the aluminum electrolysis cell 10 is lined at the sides with carbon and / or graphite (at figure 1 not shown) defined.

[0058] The cathode 12 comprises a plurality of cathode blocks 20, 20', 20'' which are each connected to each other by ramming materials 24, 24' which have been inserted into the , 20'' between the ramming material joints 22, 22'. Similarly, the anode 18 includes a plurality of anode blocks 26 , 26 ′ each having approximately twice the width and approximately half the length of the cathode blocks 20 , 20 ′, 20 ″. In this case, the anode blocks 26 , ...

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Abstract

A cathode block for an aluminum electrolytic cell comprises a primary layer and a cover layer arranged thereon, the primary layer containing graphite and the cover layer being composed of a graphite composite material which contains 1 to less than 50% by weight of a hard material having a melting point of at least 1.000 DEG C.

Description

field of invention [0001] The invention relates to cathode blocks for aluminum electrolytic cells. Background technique [0002] Such cells are used for the electrolytic production of aluminum, which is usually carried out in industry by the Hall-Héroult method. In the Hall-Héroult method, a melt composed of alumina and cryolite is electrolyzed. Here, cryolite Na 3 [AlF 6 ] for lowering the melting point of 2045°C of pure alumina to about 950°C for a mixture containing cryolite, alumina and additives such as aluminum fluoride and calcium fluoride. [0003] The electrolytic cell used in this method has a bottom consisting of a plurality of adjoining cathode blocks forming the cathode. In order to withstand the thermal and chemical environment prevailing during electrolyser operation, cathode blocks are usually constructed of carbonaceous materials. The bottom surface of each cathode block is provided with grooves, and at least one busbar is arranged in each groove throug...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/08
CPCC25C3/08
Inventor 费利克斯·埃克斯托夫弗兰克·希尔特曼
Owner SGL CFL CE GMBH
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