Aluminum electrolysis process

Aluminum electrolysis process: The modern aluminum industry uses cryolite-alumina melting salt electrolysis. The molten cryolite is a solvent, the alumina is used as an electrolytic aluminum to produce a solute, the carbon body is used as an anode, and the aluminum liquid is used as a cathode. After a strong direct current is applied, the electricity is applied at two poles in the electrolytic cell at 950 ° C to 970 ° C. Chemical reaction, both electrolysis. The chemical reaction is mainly carried out by this equation: 2Al2O3 == 4Al 3O2. Anode: 2O2ˉ-4eˉ=O2↑ Cathode: Al3 3eˉ=Al.

The anode product is mainly carbon dioxide and carbon monoxide gas, which contains a certain amount of harmful gases such as hydrogen fluoride and solid dust. In order to protect the environment and human health, the anode gas needs to be purified to remove harmful gases and dust and then discharged into the atmosphere. The cathode product is aluminum liquid, and the aluminum liquid is taken out from the tank by vacuum lifting bag, sent to the foundry workshop, purified and clarified in the holding furnace, cast into aluminum ingot or directly processed into a strand blank, a profile, and the like.

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