Melted cryolite is solvent, alumina is solute, carbon is anode, and aluminum liquid is cathode. After introducing strong direct current, the electrochemical reaction is carried out at the two poles of the electrolytic cell at the temperature of 950-970℃, that is, electrolysis.

The anode products are mainly carbon dioxide and carbon monoxide, which contain a certain amount of harmful gases such as hydrogen fluoride and solid dust. In order to protect the environment and human health, it is necessary to purify the anode gas to remove harmful gases and dust, and then discharge them into the atmosphere.

The cathode product is molten aluminum, which is extracted from the tank by vacuum bag, sent to the casting workshop, purified and clarified in the holding furnace, and cast into aluminum ingots or directly processed into wire blank profiles.

Extended data

According to the production process of electrolytic aluminum, the production cost of electrolytic aluminum is roughly composed of the following parts:

1. Raw materials: alumina, cryolite, aluminum fluoride, additives (calcium fluoride, magnesium fluoride, etc. ) and anode materials.

2. Energy costs: electricity (DC and AC) and fuel.

3. Labor costs: wages and other management expenses.

4. Other expenses: equipment loss and depreciation, financial expenses, transportation expenses, taxes, etc.

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