National Pollutant Release Inventory (NPRI) Emission Estimate Guide for Primary Aluminum Producers
- 1. Description of the Industry
- 2. Are you required to report to the NPRI?
- 3. Overview of this Guide
- 4. Description of Operations (Raw Materials, Products, Releases vs. Reporting Criteria)
- 5. Identification of sources of releases and off-site transfers
- 6. Estimating Air Emissions: Part 1
- 7. Estimating Air Emissions: Part 2
- 8. Estimating Releases to Water Bodies
- 9. Estimating Releases to Land
- 10. Estimating Off-site Transfers (Disposal and Recycling)
- 11. Glossary
- 12. References
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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