A professional who tends ball mill and auxiliary equipment that grind bauxite and mix it with materials to form slurry. Respnsibilities include:

• Computes amounts of bauxite, starch, and liquor in specified proportion, using weightometer.
• Turns valves on ball mill to grind bauxite.
• Turns valves on pumps to release liquor and starch from storage bins and to mix them with bauxite to form slurry.
• Starts pumps to transfer slurry to digester feed tanks.
• Opens and closes valves to pump sodium sulfide solution into slurry.
• Lubricates valves with grease gun, and adjusts packing glands to prevent leaks.