METHOD OF ANNEALING FINE-GRAINED MATERIAL Russian patent published in 2013 - IPC F27B15/02 

FIELD: metallurgy.

SUBSTANCE: proposed method comprises preliminary fluidisation and subsequent annealing in furnace. Said furnace heating chamber with gas distribution grate provided with feeder and communicated with sanitary cyclone, annealing chamber with annular gas distribution grate accommodating fuel burners and overflow device arranged inside cylindrical cavity, and cooling chamber with gas distribution grate provided with air duct. Note here that annular gas distribution grate is furnished with thin shaped blades and guide baffle separating material feed zone from discharge zone. Fuel burners may be provided with tangential inlet for, at least, one of fuel components. Spray angles of one part of burners differ from those of the other part. Burners are arranged at regular alternation of spray angles.

EFFECT: uniform annealing.

5 dwg