Patent ID: 6846472
Filing Date: 2005-01-25
Classification: B01D,F23G

Abstract:
1. A process for treating gaseous emissions generated during the production of carbon anodes in the aluminum industry, comprising the steps of: collecting first gaseous emissions generated during green anode production; preheating said first gaseous emissions by direct contact with a stream of combustion gases so as to evaporate all liquid tar particulates contained in said first gaseous emissions; collecting second gaseous emissions generated during anode baking; mixing said first and second gaseous emissions to form a gaseous emission mixture; injecting alumina powder into said gaseous emission mixture; processing the gaseous emission mixture with the alumina powder injected therein into an alumina 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 partially purified gaseous mixture free of solid particulates and gaseous fluorides; and processing the so obtained, partially purified gaseous mixture into an oxidation furnace in order to destroy all organic compounds contained therein.