A professional who operates machines to recover cryolite from scrap potlining. Respnsibilities include:

• Sets mill gauge to specified feed rate and adjusts air volume, according to screen analysis from laboratory.
• Sets hearth rheostats and heat controller to specified temperature, and turns valves to adjust rate of flow of steam and oil to burners.
• Starts system of conveyors, grinder, roaster, mixer equipment, cooling and exhaust fans, and burners.
• Moves levers to regulate flow of materials, and adjusts valve to control volume of liquor.
• Turns valve to drain spent liquor and lime hydrate to causticizer tanks.
• Makes titration test, records results, and sends samples to laboratory.
• Observes gauges, indicators, thermometers, and controls to ensure conformity to specifications.