日立製錬所における最近の銅製錬

Abstract

Hitachi Smelter & Refinery of Nippon Milling Co., Ltd. has greatly devel oped its technology and has increased its copper production capacity.Oxygen Smelting Process was applied in 1958, and concentrates were charged into converters and blister copper was directly obtained by using oxygen enriched air. In 1972, the Oxygen Smeiting Process was taken over by Flash Smelting Process, With a monthly productlon capacity of 7, 000 tons of copper from concentrates.Oxygen ennchment was also applied to the flash furllace operation in which the high temperature air was supplied by hot stoves.In addition, the monthly refining capacity rcached 16, 000 tons of copper by constructing a new tank house with a monthly capaclty of 10, 000 tons of electroiytlc copper. The new tank house is equipped with only one over-head crarle, as a result of instaliing highly developed handling machilles and a special double-hook system, That can simultaneously crop both anodes and cathodes.New slime treatment plant was also constructed, The technology of The Ferric Leaching Process was developed and a high efficiency of copper removal from anode slime was realized.Owing to the econornlcal suppression, the smelting division has been shut down since September in 1976. The anodes have been transported to Hitachi tallk house from Saganoseki Smeiter.