PROCESS FOR TREATING ALUMINIUM SLAGS

摘要

Process for treating aluminium slags (41) in the form of dross or aluminium salt slags obtained in the winning of aluminium, in which the aluminium slag (41) obtained in the melting process is brought with exclusion of the surrounding atmosphere onto a cooling conveyor (16) which is arranged in a housing (32) provided with extraction facilities (20, 30) and whose first section (18) adjoining the supply of the aluminium slag (41) is flushed with an inert gas and whose second section (29) serves for further cooling of the aluminium slag (41) with introduction of air, where the lengths of the first section (18) and the second section (29) of the cooling conveyor (16) are designed so that in the first section (18) the aluminium slag (41) is cooled to a temperature at which the aluminium slag (41) can no longer be chemically changed by exposure to atmospheric oxygen and in the second section (29) the slag is cooled to a temperature at which the cooled aluminium slag (41) can be processed further to recover the aluminium in the aluminium slag after leaving the cooling conveyor (16).