Report summarySumitomo has operated major copper smelters in Ehime prefecture since 1893. Pollution was a major problem until a neutralisation plant was built in 1939. In 1969 construction started on a large, modern and pollution free smelter to replace the Shisakajima smelter. The Toyo smelter was commissioned in 1971 with a capacity of 850t/d concentrate. The acid plant was uprated to a double contact system in 1978 and an oxygen plant was added in 1982. Further oxygen plants were added in 1989 and...
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