A professional who operates classifier units to separate coarse and fine precipitated alumina particles from liquor. Respnsibilities include:

• Regulates valves on settling trays of hydroseparators to draw fine particles from top and coarse particles from bottom of trays.
• Adjusts valves to wash liquor from coarse particles in classifier unit.
• Pumps fine hydrate from underflow of tray thickeners to storage tank for use in precipitating more alumina, and pumps coarse particles to storage tanks to await further processing.
• Lubricates valves and adjusts packing glands to prevent leaks.
• May open and close valves and start and stop pumps to circulate cleaning solutions through process lines.
• May keep log of operations.