Job Description:

• 1) Tends series of oil-fired kettles that refine lead: Charges kettle with lead in molten or pig form, and fires kettle.

• 2) Adds specified type and amount of reagent and agitates mixture to cause impurities, such as antimony, arsenic, bismuth, and tin to form into dross.

• 3) Skims dross off mixture, using ladle, shovel, or perforated dipper.

• 4) Throws zinc bricks into kettle and agitates mixture to desilverize lead.

• 5) Skims crust of silver and gold content into basket of press, and compresses dross with air-driven ram.

• 6) Pumps lead through reaction cylinder while chlorine is admitted to form zinc chloride slag.

• 7) Skims slag after completion of reaction as indicated by color of slag and molten metal.

• 8) Pours metal into molds or dips samples into cold water to prepare them for laboratory analysis.

• 9) May hook pot to crane and signal OVERHEAD CRANE OPERATOR to transfer lead from one kettle to another.

• 10) May crystallize zinc in water-cooled vacuum tank to remove zinc from desilverized lead.

• 11) May produce antimony crystals from antimonial lead by mixing prescribed reagents with molten metal in kettle, by skimming dross, and by cooling bath to specified temperature.

• 12) May be known according to specific duty performed as Desilverizer.