Patent ID: 6136065
Filing Date: 2000-10-24
Classification: B01J,C21B,C22B,Y02P

Abstract:
A device for direct reduction of ore fines with a particle size spectrum, the device comprising:a buffer tank for holding the ore fines;a pressure vessel operatively connected to said buffer tank, said pressure vessel being pressurized and including a controllable discharge;a preheater connected to said discharge of said pressure vessel, said preheater preheating the ore fines, said preheater being one of a fluidized-bed reactor and a spouted-bed reactor;a preheater discharge line connected to said preheater;a hot gas cyclone arranged connected downstream of said preheater with a gas discharge line for discharging top gas to be subjected to aftertreatment;a fluidized-bed reactor divided by partitions into a plurality of chambers including a first chamber;a solids discharge line from said hot gas cyclone to said preheater discharge line for conveying the preheated ore fines from said preheater, wherein said preheater discharge line for preheated ore fines opens into said first chamber of said fluidized-bed reactor;heat exchangers, each heat exchanger extending into a corresponding one of said chambers;structure associated with said fluidized bed reactor setting fluidization velocity in individual said chambers, wherein said fluidization velocity is reduced from one said chamber to a next said chamber;a plurality of chamber hot gas cyclones arranged downstream of each said chamber for separating a defined particle fraction of the ore fines, wherein said particle fraction separated can be fed into a respective next or last of said chambers;a collecting line through which a total amount of gas of all said chamber hot gas cyclones is sent as a heating medium into said preheater; andpressure vessels for collection, said pressure vessels for collection being arranged under each said chamber for discharging and transporting reduced ore fines for further processing.