| 摘要 |
<p>PURPOSE: To efficiently recover valuable metal in a high yield by reducing dust of an electric furnace with carbon base solid reducing agent, recovering molten iron having Fe as the main component, dividing the vaporized Zn into low content dust and high content dust and recovering. CONSTITUTION: The carbonaceous material is charged into a vertical type fusing furnace 1 from a hopper 2 to form a reducing agent packing layer 3. In hear, the dust of the electric furnace is injected from upper step tuyeres 1u and hot blast at about 800-1000 deg.C is blown from lower step tuyeres 1s and reduced. By thus method, the dust containing produced Zn vapor is discharged into a hopper 8 and the molten iron containing Cr, etc., from an iron tap hole 6, and slag fixing harmful Cd, etc., from a slag tapping hole 7, are recovered. Besides, the dust is separated with a cyclone and a part of the low Zn-containing dust is returned back to the fused furnace 1 and the other part is recovered through a hopper 12. Further, the high Zn-containing dust is formed to slurry 16 by a water spraying means 15 in a cooling vessel 14 and shifted to a dehydrator 20 through a precipitator 23 to obtain a dehydro-cake having 50-80% Zn, desirably about 60-80%.</p> |
