PURPOSE: To avoid another process disturbances due to excessive portions of dust ore particles by a method wherein the speed of a gas for drying is fixed at a rate at which entraining of dust ore particles having dimensions below specified dimension and the dust ore particles are separated, collected and admixed to dried fine ore in dosed amounts.
CONSTITUTION: Fine ore 2 is inserted into a whirl bed drier 5 provided with a gas firing 6 via a proportioning belt 4 with a balance 3 from a storage tank 1. A drying gas formed during the combustion of a natural gas 8 inside 11 the whirl bed drier 5 is passed through the inserted fine ore 2 via a distribution grid 10 provided with a plurality of tuyeres 9. The speed of the drying gas 7 is fixed at a rate at which entraining of the dust ore particles 14 having dimensions below specified dimension is effected. With the upper end of the whirl bed drier 5 via a delivery duct 12, the dust ore particles 14 are separated in a cyclone separator 13 to be conveyed to a collection container 16 to get the dust ore particles 14 admixed to the dried fine ore 17 by a mixing means 21.
TESSMER GERO ING (AT)
WEIDINGER RUDOLF ING (AT)
WHIPP ROY HUBERT JR (US)
BRIFER INT LTD (BB)