A professional who tends equipment that cleans and dries ammonium sulfate crystals. Respnsibilities include:

• Pushes crystals from drain table into trough.
• Opens trough gate to discharge crystals into drier.
• Starts centrifuge to separate crystals of ammonium sulfate from acid and tar.
• Washes remaining impurities from crystals with hot water, using hose.
• Resumes spinning of centrifuge to complete drying.
• May neutralize acid in sulfate crystals with ammonia liquor.