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Fluoride emissions, in the form of gaseous hydrogen fluoride and sodium and aluminium fluorides and unused cryolite as particulates, are the major undesirable fume component produced in the aluminium smelting process. Such emissions can be reduced through the use of fume control systems, operational good practice and improved technology.
Includes | ||
|---|---|---|
Prebake Technology | Uses multiple anodes in each cell, which are baked in a separate facility and attached to rods that suspend the anodes in the cell. | |
Søderberg Technology | Uses a continuous anode which is delivered to the pot in the form of a paste, and which bakes in the cell itself. |
The data presented here is not suitable for life cycle assessment (LCA) purposes, rather data from the IAI life cycle inventory (LCI) report (http://www.world-aluminium.org/media/filer_public/2013/09/05/2010_life_cycle_inventory_report.pdf) or from alternative sources, such as regional aluminium associations or life cycle data providers, should be used.
The data included in this IAI Statistical Report have been derived from voluntary reports of IAI Member and non-Member companies, with technology-specific assumed performance for non-reporting facilities based on reporting companies.
The IAI Statistical System is designed to meet the requirement that, in general, individual company data be included only within appropriately aggregated totals and not be reported separately. Fluoride Emissions are aggregated by different technologies – Prebake technology: and Søderberg technology (decriptions above).
One asterisk * indicates that the number is revised from previous publication.
