Abstract
Naoshima is located in the Inland Sea of Japan about 120 miles west from Osaka and the old smelter was commenced 50 years ago. Over the years, the smelter has undergone many changes to increase production, improve the technology and reduce the operation cost.In accordance with increase of copper consumption in Japan, Mitsubishi Metal Mining decided to construct the New Cooper Smelter and Refinery Complex with capacity of 7, 000 metric tons electrolytic Cu per month at Naoshima. The new complex was completed at the end of 1969, and the full production of 7, 000 metric tons was achieved March 1970.This paper describes smelling and refining process, flow sheet, tonnage and assay of products. Particular emphases will be given to the partial roasting fluidized bed process for copper concentrate, the reverberatory furnace with deepbath operation to introduce hot calcine charge with Wagstaff Gun, side stream cell circulation system in the tank house and environmental qualities in the plant site. Plant design work was proceeded by Mitsubishi Metal Mining personnel.
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