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National Pollutant Release Inventory (NPRI) Emission Estimate Guide for Primary Aluminum Producers

11. Glossary

This section presents the terms commonly used in connection with primary aluminium production.

  • Alumina: Aluminium oxide (Al2O3), produced by refining bauxite ore
  • Anode: (Positive) carbon electrode consumed in the electrolysis process
  • Bath: Liquid component of the cell in which the alumina is reduced to aluminium
  • Calcined petroleum coke: Raw material used to manufacture the anode
  • Cathode: (Negative) carbon electrode insulated with refractory bricks in the electrolytic cells
  • Cryolite: Molten salt (Na3AlF6), which is added to the bath and can dissolve the alumina
  • Dust collector: Bags used to filter the dust
  • Dry scrubber: System that uses the adsorbent properties of a material (coke and alumina) to control atmospheric Volatile Organic Compound (VOC), polycyclic aromatic hydrocarbon (PAH), hydrogen fluoride (HF) and process dust emissions.
  • Pitch: Raw material used to manufacture the anode; acts as a binder.
  • Pyroscrubber: System designed to remove carbon-rich materials in a gas stream at high temperature
  • Wet scrubber: Removes contaminants in an air stream by bringing them into contact with a liquid (alkaline solutions)  
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