A professional who controls chemical-processing equipment to recover tungsten oxide from ground concentrated ore. Respnsibilities include:

• Starts conveyor to fill reactor tank with ore.
• Turns valves to pump specified quantity of hydrochloric acid into tank and to admit steam into tank jacket.
• Observes temperature gauge and adjusts valves to maintain acid solution at specified temperature for specified time.
• Fills tank with water to wash slurry, and drains waste-bearing water.
• Turns valve to pour slurry into caustic tank.
• Precipitates impurities, such as chlorides and oxides, by adding ammonia and sulfuric acid to solution.
• Filters solution into holding tank to remove precipitate.
• Adds specified amount of hydrochloric acid to tank to crystallize solution.
• Dries tungsten oxide crystals by pumping them through filter or centrifuge.