Patent ID: 7867318
Filing Date: 2011-01-11
Classification: C22B,Y02P

Abstract:
1. A process of treating filter dust produced in aluminium recycling processes in a recycling system for recycling salt slag, comprising at least: a pyrolysis step in which the filter dust enters a rotating auger where it is heated to a temperature of not less than 500° C. and not more than 600° C.; and in which organic and toxic substances breakdown in said heating and part of carbon and other combustibles burn in controlled presence of air, said air being mixed with dust by movement of the rotating auger; in which organic materials are oxidized due to oxygen provided; and in which a solid result of the pyrolysis step is added to the salt slag recycling system; and a gas treatment step in which gases which are a result of the pyrolysis step are filtered, retaining dust and neutralizing gases for dumping into the atmosphere.