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Abstract
Tin smelting at Ikuno Plant started its operation in 1913 with reverberatory furnace smelting process. In 1950, the company replaced the reverberatory furnace with an electric furnace to improve operation efficiency and recovery. In 1987, Akenobe mine was shut down. Because the production of tin concentrates was stopped, raw materials of tin decreased to half. In 1991, the tin refining plant with new technology started operation at Ikuno Plant, while the tin refining plant at Naoshima was shut down.At present, various tin bearing scraps are roasted, smelted and refined to produce about 97% crude tin. It is cast to anode and electrorefined with stainless cathode to 99.995+% electrolytic tin. Part of this electrolytic tin is reelectrorefined to 99.999+% high purity tin.Annual production of crude tin metal is 720 metric tons, electrolytic tin is 660 metric tons and high purity tin is 360kg.
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