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Function of the Anode Carbon in Electrolytic Aluminum

The anode carbon block is extremely important in the production of electrolytic aluminum. Due to the impact of environmental protection policies, production reduction and product restriction have become the keywords in the carbon industry, which also lead to a continuous increase in the price of the anode carbon. And at the current point of increasing supply, from the shortage of electrolytic aluminum to the shortage of anode carbon, the focus of the market is more on anode carbon.

The electrolytic production principle of electrolytic aluminum is to use cryolite-alumina molten salt electrolysis. It is a multiphase electrolyte system composed of cryolite-based fluoride salt as the flux and alumina as the melt. The whole electrolysis process is mainly based on cryolite-alumina melt as the electrolyte. The carbon material is the cathode and anode, and the direct current is introduced from the anode and then exported from the cathode rod after passing through the electrolyte and aluminum liquid layer. The function of the direct current is to keep raw materials such as cryolite and alumina in a molten state in the form of heat energy and achieve the electrochemical reaction. As a result of the reaction, carbon dioxide and carbon monoxide gas are generated on the anode, and liquid metal aluminum is precipitated on the cathode. As the electrolytic process proceeds, the precipitated aluminum is accumulated and taken out periodically from the electrolytic cell. The removed aluminum is sent from the electrolysis plant to the foundry department. After corresponding treatment, it can be cast into billets of various specifications.

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