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Process for producing a cathode block for an aluminium electrolysis cell and a cathode block

A cathode block and coke technology, applied in the field of cathode blocks, can solve the problems of low wear resistance and low wear resistance of cathode blocks, and achieve the effect of long service life

Active Publication Date: 2013-04-10
TOKAI COBEX GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, TiB on carbon cathode 2 layer and carbon with TiB 2 The wear resistance of the composite layer is still too low, and the wear resistance of the cathode block provided with the corresponding layer is therefore also too low

Method used

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  • Process for producing a cathode block for an aluminium electrolysis cell and a cathode block
  • Process for producing a cathode block for an aluminium electrolysis cell and a cathode block

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Embodiment Construction

[0034] To manufacture the cathode block according to the invention, the first coke and the second coke are ground separately from each other, separated into particle size groups and mixed together with pitch. The proportion by weight of the first coke to the total amount of coke may amount to, for example, 10 to 20% by weight or 40 to 45% by weight. Cathode blocks can be manufactured by extrusion from a raw meal mixture. Alternatively, the mixture can be filled, for example, into a mold which substantially corresponds to the subsequent shape of the cathode block, and the mixture compacted or briquetted by vibration. The formed green body is heated to a final temperature in the range of 2400 to 3000°C, a carbonization step followed by a graphitization step takes place, and is subsequently cooled. The formed cathode block has a 1.71 g / cm 3 Bulk density and high wear resistance for liquid aluminum and cryolite.

[0035] figure 1 The dilatometer measurement curve (represented ...

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Abstract

The invention relates to a process for producing a cathode block, comprising the following steps: providing starting materials, including coke, forming the cathode block, carbonizing and graphitizing, and also cooling. According to the invention, the coke comprises two types of coke which, during the carbonizing and / or graphitizing and / or cooling, have a different volume change behaviour.

Description

technical field [0001] The invention relates to a method for manufacturing a cathode block for an aluminum electrolytic cell and a cathode block. Background technique [0002] One known method of producing metallic aluminum is the Hall-Heroult process. In this electrolysis process, the base of the electrolytic cell is generally formed by a cathode surface comprising individual cathode blocks. The cathodes are contacted from below via steel rods, which are introduced into corresponding elongated grooves on the underside of the cathode block. [0003] Conventionally, the manufacture of cathode blocks is carried out by mixing coke with carbonaceous particles such as anthracite, carbon or graphite, compacting and carbonizing. This is followed, if necessary, by a graphitization step at higher temperatures, in which the carbonaceous particles and coke are at least partially converted into graphite. A carbon cathode is obtained which is at least partially made of graphite. [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/08
CPCC25C3/08Y02E60/10
Inventor 马丁·库赫尔詹努兹·图马拉弗兰克·希尔特曼
Owner TOKAI COBEX GMBH
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