METHOD OF ROASTING SULFIDE MATERIALS IN FLUIDIZED LAYER Russian patent published in 2004 - IPC

FIELD: non-ferrous metallurgy; roasting sulfide concentrates in fluidized-bed furnaces. SUBSTANCE: proposed method includes dispersed feed of oxygen-containing blast under hearth and to above- layer space; gas is fed to above-layer space perpendicularly to direction of motion of dust-and-gas flow at blast excess coefficient relative to content of sulfides in dust of α= 1.5-3.0 at excess of rate of feed above velocity of dust-and-gas flow no less than 10 times at complete closing of entire section of above-layer space. EFFECT: reduction of sulfur content in dust to 0.8-0.9%; facilitated procedure. 2 cl, 1 tbl