Job Description:

• 1) Controls chemical-processing equipment to recover tungsten oxide from ground concentrated ore: Starts conveyor to fill reactor tank with ore.

• 2) Turns valves to pump specified quantity of hydrochloric acid into tank and to admit steam into tank jacket.

• 3) Observes temperature gauge and adjusts valves to maintain acid solution at specified temperature for specified time.

• 4) Fills tank with water to wash slurry, and drains waste-bearing water.

• 5) Turns valve to pour slurry into caustic tank.

• 6) Precipitates impurities, such as chlorides and oxides, by adding ammonia and sulfuric acid to solution.

• 7) Filters solution into holding tank to remove precipitate.

• 8) Adds specified amount of hydrochloric acid to tank to crystallize solution.

• 9) Dries tungsten oxide crystals by pumping them through filter or centrifuge.