| 摘要 |
<p>PURPOSE:To economically recover molten valuable metals in good yield by separating the by-product in the production of stainless steel into a massive material and a powdery material, charging the massive material into a shaft furnace from its top, and charging the powdery material from the tuyere by high-temp. oxygen-enriched air. CONSTITUTION:The valuable metal-contg. slag generated in the refining of stainless steel is separated into a massive material and a powdery material. The massive material is charged into the shaft furnace main body 1 from its top 6 along with carbonaceous material, scrap steel, etc. Meanwhile, the powdery material is dried in a drying furnace 12 along with the by-product such as dust, and then supplied to the wind box group 31 of the upper tuyere group 5 through hoppers 38 and 34. The powdery material is injected therefrom into the furnace by the high temp. oxygen enriched air obtained by adding oxygen to the hot air from a hot stove 13. At the same time, the high-temp. oxygen-enriched air having a lower content of oxygen than the above- mentioned oxygen enriched air is blown in from the lower tuyere group 4. Valuable metals are recovered from the by product, and taken out as the molten ferrometal from the tap hole 2 at the bottom of the furnace.</p> |
