Method for softening lead bullion

Details Method for softening lead bullion Method for softening lead bullion

C - Chemistry, Metallurgy

22

B

53/337

C22B 13/06 (2006.01)

Patent

CA 1333664

Lead bullion is softened with pure oxygen at a temperature in the range of 590 to 650°C without heating the main bullion charge to the required softening temperature. A portion of the charge is diverted to a small softening furnace, heated and softened to remove at least a portion of the arsenic antimony and tin. Slag and softened bullion are separately removed from the furnace. Softened bullion is either returned to the main charge or fed to a separate vessel. The method is conducted batchwise, semi- continuously or continuously.

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