Fluoride Emission from Anode Butts in a Cooling Tunnel

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Courtesy of Boreal Laser Inc.

Abstract
Nordic Aluminium has been trying out a cooling tunnel for hot anode butts in order to lower the fluoride content of the working environment. The cooling tunnel is connected to the Fume Treatment Plant so that it has forced suction from it. The purpose of this study is to evaluate the effectiveness of the tunnel in removing HF emissions and make suggestions on how to make the tunnel effective and yet simple to use. The HF emissions were measured inside the cooling tunnel using a tunable diode laser (TDL) technique and the airflow from the tunnel was measured using a conventional anemometer. The tunnel design was modified to make it simpler in operation. The measurements of the tunnel emissions after modification indicated that the tunnel was only removing roughly one third of the HF emissions from the butts inside the tunnel. This is due to insufficient suction. A project was started to increase the suction and improve further the modifications.

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