Production process for graphitized cathode

Abstract

The invention discloses a graphitizing cathode process, which comprises selecting and mixing delayed petroleum coke, pitch coke, after calcinations, fragmenting and sieving, adding hard pitch binder after mixing, pugging, machining charcoal rough shape of electrobath cathode, baking to make binder pitch carbonizing, making graphitizing cathode charcoal block. The invention has good mechanical, electrical , thermal property, and costs low, is especially suitable for large scale electrolytic cell.

Description

Technical field: [0001] The invention relates to a production process of a cathode used in a large prebaked electrolytic aluminum tank. technical background: [0002] With the in-depth development of electrolytic aluminum in the direction of large-scale pre-baked tanks, graphitized cathodes have become the commonly used materials for large-scale pre-baked tanks in the world: because graphitized cathodes have low cathode pressure drop, excellent thermal conductivity, and resistance to sodium expansion during the electrolytic production process Good performance and other advantages, many old tanks in production are changing to graphitized cathodes during the overhaul process to achieve the purpose of enhancing current production and increasing efficiency. However, the graphitized cathodes used in foreign countries are very expensive due to the limitations of materials and processes used. At present, most of the production of aluminum cathodes in my country still stays in semi-...

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Problems solved by technology

However, the graphitized cathodes used in foreign countries are very expensive due to the limitations of materials and processes used. At present, most of the production of aluminum cathodes in my country still stays in semi-graphitic carbon blocks with anthracite as the main graphite content and a graphite content of less than 30%. In the low-level stage, due to the high resistivity of the semi-graphite cathode (2.5-3 times that of the graphitized cathode), the cathode pressure drop of the electrolytic cell is high, and the power consumption is high; the thermal conductivity is poor (10-20% of the graphitized cathode), Affect the heat balance of large-scale electrolyzers and seriously affect the further development of electrolysis technology in my country

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