VACUUM REFINING DEVICE FOR CRUDE COPPER

摘要

PURPOSE:To remove efficiently impurities in copper by providing an introducing port for oxygen-contg. gas to a vacuum device and bringing oxygen into contact with the copper during the vacuum treatment thereof. CONSTITUTION:The crude copper introduced into a furnace 3 is sucked up into a vacuum device 15 through a lifting pipe 11. The melt is risen into the device 15 by the difference between inert gas and the degree of vacuum in this stage. The melt contacts the oxygen through an introducing port 17 for oxygen-contg. gas provided in the upper part on the discharging pipe 6 side of the device 15 by which the greater part of Sb, Bi, As and PB in the crude copper are removed. Most of S and O2 are removed as well. A waste gas flue 18 is provided on the side opposite to the port 17 to prevent free pass. The melt is charged and run through the pipe 6 by a burner 10 so as to be conducted again into the pipe 11. The excess dust discharged from the device 15 is recovered by a recovering device 16.