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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.




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End Of Job Description for: "KETTLE TENDER I"
DOT:   519.685-022

Job Number: 5529