アルミニウム製錬の歴史的経過

抄録

The histrical review of producing aluminium since 1825 is outlined. Yearly production rates surpass other metals. In 1970, over 10, 000, 000 tons of aluminium was produced. The resources of bauxite are estimated to be over 5, 000, 000 tons.
Recently the technics for alumina production are directed for mechanization and automatic control. The plant capacity is increasinh, the largest one has 1, 500, 000 tons alumina per year. In the field of electrolysis, the anode type generally adapteg was changed from prebaked multiple to Söderberg continuous horizontal and to vertical. But recently large current 100-150kA pot preboked anode type system has been favored again. Mechnizations of operation was largely adopted. In the large current pot, the effect of magnetic field becomes serious and the bus arrangement for compensation is explained.
The aluminium industry will develop constantly and in the year 2000 the world praduction will reach 50, 000, 000-90, 000, 000 tons.