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2008 — Environment
Fluorides: landmark results at the Deschambault Smelter
Despite increasing production, the Deschambault Smelter achieved its lowest fluoride emissions ever in 2007: 0.26 kg F/t Al compared to an annual average of 0.32 kg F/t Al over the last few years. Emissions are measured in two locations, at the scrubbers and at the roof vents, and measures have been specifically adopted in both places to achieve this strong performance.
Fluoride emissions at the roof vents, which are located above the electrolytic pots, were lowered through the installation of more airtight pot lids, as well as new side hood supports and drawers. Rigorous monitoring in the Electrolysis sector is conducted to provide each operator with a precise idea of his performance and ways to continuously improve. In addition, exchange of information with the environmental preventionists has created a real synergy between the Environment group and operators, who are now more aware than ever of the consequences of their actions on the quality of the environment.
Daily monitoring also takes place at the scrubbers. As soon as an abnormal fluoride level is detected, the situation is taken very seriously and corrective measures immediately implemented.
The secret of this year’s success lies in individual effort and continuous equipment improvements. The Deschambault Smelter is already a reference within Alcoa for its low fluoride emissions. In fact, its expertise has been transferred to Alcoa’s new facilities in Iceland and Norway. This year’s performance, which we can all be proud of, is a clear indication of the smelter’s desire to remain an industry leader.