METHOD FOR TREATING DUST IN ELECTRIC FURNACE

摘要

PURPOSE: A method for treating dust in an electric furnace is provided which greatly reduces loss of zinc by a reducing agent by smelting reducing the sorted materials after sorting magnetic constituents and non-magnetic constituents using a fluidized bed magnetism sorter. CONSTITUTION: The method for treating dust in an electric furnace comprises the steps of reducing dust of the electric furnace using flue gas of a pre-reduction furnace by charging the dust of the electric furnace in a dust tank(110) of the electric furnace into a fluidized bed reduction furnace(120), and cooling the dust to an ordinary temperature by charging the reduced dust of the electric furnace into a cooler(140); manufacturing into non-magnetic substance pellets by bulking the non-magnetic substance dust in a non-magnetic substance pelletizer(190A) and manufacturing magnetic substance pellets by bulking magnetic substance dust along with reducing agent and flux in a magnetic substance pelletizer(190B) after sorting dust of the electric furnace in the dust tank(110) of the electric furnace and the cooled dust of the electric furnace into magnetic substance dust and non-magnetic substance dust using a fluidized bed magnetism sorter(160); reducing the charged magnetic substance pellets using flue gas of a zinc condenser(220) partially burned or heated in a hot blast stove(230) after charging the magnetic substance pellets into a pre-reduction furnace(200); manufacturing pig iron by smelting reducing the charged magnetic and non-magnetic substance pellets after charging the pre-reduced magnetic and non-magnetic substance pellets into a smelting reduction furnace(210); and manufacturing condensed zinc by condensing zinc gas contained in the flue gas of the smelting reduction furnace.