Abstract
Molten salt electrolysis, which is free from carbon dioxide emissions, is often used. Although no carbon dioxide emissions are expected, huge amounts of CO_2 are generated in actual molten salt electrolysis because graphite electrodes are used as anodes. We are developing a CO_2-free process using arc electrodes. Alumina (Al_2O_3) with cryolite (Na_3AlF_6) and aluminum fluoride (AlF_3) are melted and electrolysis reaction is realized in a graphite crucible by argon plasma arc. Production of aluminum is confirmed although its current efficient is not so high.
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