Method of treating fine ore

摘要

In a process for treating fine ore, the fine ore is dried by aid of a hot drying gas flowing around the ore particles of the fine ore, the drying gas, after having flown around the ore particles, is purified while releasing entrained dust ore particles and the dust ore particles are collected and admixed to the dried fine ore. In order to avoid process disturbances in the further processing of fine ore due to excessive portions of dust ore particles present within the fine ore, drying is effected in the whirl-bed, i.e., fluidized-bed method under simultaneous wind-screening of the fine ore, wherein the drying gas is passed through the fine ore under formation of a whirl bed and the speed of the drying gas is fixed at a rate at which entraining of dust ore particles having dimensions below a predetermined dimension is effected, and that the dust ore particles entrained by the drying gas are separated, collected and admixed to the dried fine ore in dosed amounts.