Abstract
Hachinohe Smelting Company was established on February 1, 1967, as a joint toll smelter to take advantage of the Imperial Smelting Process.The smelter produces zinc and lead simultaneously and has been operating and performing excellently since its commencement.In April 1988 the zinc production capacity of Imperial Smelting Furnace (ISF) was increased from 81, 000 to 101, 000 tonnes per year.The additional production in the ISF has been attributed to the utillization of the hot briquetting process adopted in 1987.Recently, many improvements and modifications have been made at Hachinohe Smelter, for example, the improvement of condensation efficiency based on the modification of the condenser design, the rotor profile etc., the reduction of energy consumption by the improvement of sinter/hot briquette/coke quality and introducing of the steam turbine driven blower for ISF etc.According to these improvements and modifications, the furnace zinc production of Hachinohe Smelter was achieved 107, 482 tonnes in 1992 which was the best production record in the year among all ISP's in the world.The further improvements of metallurgical performances, and the recovery of metals from ISF slag will be intended.
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