Patent ID: 9587291
Date: 2017-03-07
CPC Classifications: C22B,Y02P

Claim:
1. A method for treating aluminum slag in the form of dross or aluminum salt slags obtained in the extraction of aluminum, comprising the following steps: placing the aluminum slag obtained in a melting process with exclusion of surrounding atmospheric air onto a cooling conveyor that is arranged in a housing, wherein said housing is provided with exhaust devices, wherein said cooling conveyor has a first section adjoining the supply of aluminum slag and a second section; flushing said first section with an inert gas to cool said aluminum slag on said cooling conveyor; further cooling said aluminum slag on the second section by introduction of air, wherein the lengths of the first section and the second section of the cooling conveyor are configured so that in the first section, the aluminum slag is cooled to a temperature at which the aluminum slag can no longer be chemically changed by exposure to atmospheric oxygen and in the second section, the aluminum slag is cooled to a temperature at which the cooled aluminum slag can be processed further to recover the aluminum in the aluminum slag after leaving the cooling conveyor.