| 摘要 |
<p>PURPOSE:To recover Zn from steel making dust contg. zinc by separating Zn as vapor and condensing to liq. state by heating the dust with a heat medium to allow the zinc to react with a reducing material in an induction type electric furnace provided with a condenser in a cover part. CONSTITUTION:The pellets of steel making dust contg. Zn and a reducing agent such as powder coke are charged into a reaction retort 1 consisting of a low frequency induction furnace. A heat medium 6 such as iron scrap or the like in the retort is heated inductively by low-frequency induced electric powder, and the pellets of the steel making dust and the coke are allowed to react by the heat generated by heating so that ZnO in the pellets is reduced to Zn and is evaporated as the vapor of Zn. The vapor is condensed as liquid Zn 8 in a condenser 3 provided in a cover body 2 and zinc is thus recovered. The Fe component in the dust absorbs the C in the reducting agent and adds the same as molten cast iron in a heat medium 6, thereby increasing the heat capacity of the heat medium. The formed molten slag and a part of the increasing heat medium are removed by tilting the retort 1 and again the pellets and the reducing agent are added thereto so that the Zn is reduced and recovered.</p> |
