Aluminum in the production process there are four links constitute a complete industrial chain: aluminum ore mining - alumina production - electrolytic aluminum smelting - aluminum processing production.
At present, the only method for industrial production of primary aluminum is the Hall-Ellu aluminum electrolysis method. It was invented by Hall of the United States and Eru of France in 1886. Hall - Elu aluminum electrolysis method is based on alumina as raw material, cryolite (Na3AlF6) for the melt composition of the electrolyte, under the conditions of 950-970 ° C through the electrolysis of the electrolyte melt in the alumina decomposition of aluminum and oxygen, aluminum precipitation in the form of a liquid phase at the cathode of the carbon, oxygen in the carbon anode in the form of carbon dioxide gas escape. Oxygen escapes in the form of carbon dioxide gas at the carbon anode.
Industrial aluminum electrolysis tanks can be broadly divided into three categories: side-inserted anode self-roasting tanks, top-inserted anode self-roasting tanks and pre-roasted anode tanks. Due to the high power consumption in the electrolysis process and the lack of environmental protection, the roaster technology is gradually being phased out.
