Graphite cathode carbon block is a carbon block made of high-quality anthracite, coke, graphite, etc., which is used as the cathode of the aluminum electrolyzer. It is built on the bottom of the electrolyzer, also known as the bottom carbon block. The cathode carbon block plays the dual role of conducting electricity and forming the lining of the electrolyzer.
Aluminum electrolysis production requires the cathode carbon block to have the characteristics of high-temperature resistance, molten salt corrosion resistance, electrical conductivity, good thermal conductivity, high mechanical strength, good thermal shock resistance, and strong sodium corrosion resistance, which is conducive to energy-saving and electrolyzer life improvement in aluminum electrolysis production.
The types of cathode carbon blocks are divided into three categories: ordinary cathode carbon blocks, semi-graphite carbon blocks, and graphite carbon blocks according to the quality requirements of the product, the selected raw materials, and the adoption of process conditions.
The graphitized cathode is a conductive material used in the cathode of aluminum electrolyzers, which represents the development direction of the electrolytic aluminum industry. With the technological progress and development of the electrolytic aluminum industry, the electrolyzer is developing towards a large capacity above 300KVA, and the requirements for cathode materials are higher. The main advantage of the graphitized cathode is that it can strengthen the current, improve the current efficiency, achieve the purpose of increasing production and energy saving, and make the electrolyzer run stably. The larger the electrolyzer type, the more obvious the effect of stable operation, and the more obvious the improvement of current efficiency. The unit production capacity of aluminum electrolyzer using graphitized cathodes is increased by 10-15%, and the electricity-saving per ton of aluminum is more than 600KWh. Graphitized cathode aluminum electrolyzer is one of the materials prioritized by the state in the electrolytic aluminum industry due to its obvious effect of energy saving, consumption reduction, and emission reduction.
