Patent ID: 6797240
Filing Date: 2004-09-28
Classification: B01J,C01B,C23G,Y10S

Abstract:
An apparatus for use in regenerating spent acid liquor, comprising:a primary roasting furnace having a spent acid liquor inlet, a heating device for heating spent acid liquor in said primary roasting furnace to a temperature to evaporate a liquid portion and to produce acid vapors and a partially roasted metal salt, said primary roasting furnace further having a first outlet for discharging acid vapors, and a second outlet for discharging partially roasted metal salt; and a secondary roasting chamber having an inlet for receiving said partially roasted metal salt, a heating device for heating said secondary roasting chamber to a secondary roasting temperature sufficient to oxidize said metal salt substantially to a metal oxide and to separate acid residues from said metal salt, and having an outlet for said acid vapors and metal oxide.