Job Description:

• 1) Tends battery of tanks that precipitate aluminum hydroxide from rich liquor: Schedules filling, seeding, and emptying of precipitator tanks.

• 2) Opens feedline valves to fill tanks to designated levels with liquor and alumina seed slurry.

• 3) Adjusts valves to regulate rate of filling precipitators and to maintain specified level in green-liquor tanks.

• 4) Opens feedline valves to admit measured quantities of aluminum hydrate seed particles into precipitators.

• 5) Turns valves to agitate mixture with compressed air.

• 6) Turns valves to control flow of liquor to tanks of secondary thickness.

• 7) Weighs sample of mixture in flask on platform scale.

• 8) Reads charts and graphs to determine amount of slurry or liquor required to obtain specified consistency.

• 9) Signals BOTTOM-PRECIPITATOR OPERATOR to pump mixture from tanks.

• 10) Records sequence of operations on forms.

• 11) May lubricate valves and adjust packing glands to prevent leaks.