A process for treating gaseous emissions generated during the production of
carbon anodes in the aluminum industry. In this process, first gaseous
emissions generated during green anode preparation are collected and
preheated by direct contact with a stream of combustion gases. Second
gaseous emissions generated during anode baking are also collected and
mixed with the first gaseous emissions to form a gaseous emission mixture.
Alumina powder is then injected into the so obtained mixture and the
resulting mixture with the alumina injected therein is processed into a
dry scrubber that is equipped with a bag filter and is operating at
temperatures well above the saturation temperature of tars, so as to
obtain a gaseous mixture partially purified and free of fluorides and
particulates. The so obtained partially purified gaseous mixture is then
processed into an oxidation furnace in order to destroy all the organic
compounds contained therein.
