Abstract
Our company, MLI, started aluminium smelting business at Naoetsu in 1963 and enlarged it to 4 potlines in 1970. Main raw materials for producing aluminium are alumina, carbon materials and fluorides. Alumina is reduced by electric power to aluminium in the molten bath of cryolite and aluminium fluoride at about 970°C. Our technoloty is ac follows:(1) We have our own power station operated by using heavy oil. The power station is consisted of direct current generators driven by diesel type engines. This method is superior with respect to energy efficiency and facility utilization to the laree unit steam driven Hower stations.(2) We have 100kA Soderberg cells of vertical spike type. We have improved cathode lining technique, anode manufacturing process and have developed the computer control system of cell operation. Now our operational results have approached near those of Pre-baked type cells, with DC power consumption under 14, 000 kWh/t-Al and anode paste consumption under 500 kg/t-Al. And we have achieved DC power consumption of 13, 000 kWh/t-Al in several cells.(3) We have improved our original fluoride recovery technology to produce aluminium fluorides directly by using alumite sludge.
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