Patent ID: 6186081
Filing Date: 2001-02-13
Classification: C10J,C10K,C21C,F27D,Y02P

Abstract:
A process for treating sewage sludge or waste, said process comprising:subjecting the sewage sludge or waste to pyrolysis under an oxygen-poor atmosphere to provide solid pyrolysis residues and a pyrolysis gas;mechanically treating the solid pyrolysis residues to separate a coarse fraction and a fine fraction, the coarse fraction including metal oxides;feeding the coarse fraction into a liquid slag contained in a metal bath reactor, the metal bath reactor also containing a metal bath on which the liquid slag floats;entraining the fine fraction in a carrier gas and introducing the entrained fine fraction and the carrier gas via a nozzle into the metal bath contained in the metal bath reactor in order to carburize the metal bath;reacting the carburized metal bath with the liquid slag to reduce the metal oxides of the coarse fraction contained in the liquid slag; andsmelting and heating the liquid slag with at least a portion of the pyrolysis gas.