Method for reducing aluminum fluoride consumption in aluminum electrolysis

• Main Authors: WANG JUNQING, LUO LIFEN, JIAO QINGGUO, JIANG ZHIAN, HOU GUANGHUI, LI CHANGLIN, WANG HUAIJIANG, HU QINGTAO, WANG JUNWEI, FANG BIN, MA JUNYI, LI ZHENGWEI
• Format: Patent
• Language: Chinese; English
• Published: 14.07.2023
• Subjects: APPARATUS THEREFOR; CHEMISTRY; COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM,CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THERARE-EARTH METALS; ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; INORGANIC CHEMISTRY; METALLURGY; PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY ORREFINING OF METALS

The invention relates to the technical field of aluminum electrolysis, in particular to a method for reducing aluminum fluoride consumption in aluminum electrolysis. The method comprises the following steps: removing impurities from aluminum oxide by using an acidic solution, and then carrying out solid-liquid separation and washing to obtain purified aluminum oxide after impurity removal; drying the pure aluminum oxide to obtain an aluminum oxide product; aluminum electrolysis is carried out by adopting an aluminum oxide product, so that the consumption of aluminum fluoride is reduced; the flushing time is before aluminum oxide feeding; heat required by drying is provided by waste heat of aluminum electrolysis; alkali metal and alkaline earth metal in aluminum oxide before use are washed away through an acid solution, then aluminum oxide is dried through waste heat in the aluminum electrolysis process, the waste heat in the aluminum electrolysis process can be efficiently utilized to complete treatment of al