| 摘要 |
<p>PURPOSE:To improve the recovery rate of Fe, and Cr at a low cost by executing smelting reduction while increasing and decreasing the charging amt. of the coke adjusted in viscosity according to the compsn. of briquettes mainly consisting of byproducts in production of stainless steels. CONSTITUTION:The byproducts generated in the process for production of the stainless steels are used as main raw materials and the coke is incorporated therein to obtain the briquettes. The briquettes 3 are charged together with a raw material mixture 4 consisting of the coke and a slag forming material to be added at need into a smelting furnace 1. The briquettes and the raw materials are then energized via electrodes 2. As a result, the briquettes 3 are smelting reduced in a molten area 5 by the coke and the produced molten iron of the valuable metals contg. Fe and Cr formed in such a manner is recovered from a tap hole 6. At that time, the grain sizes of the coke to be charged into the smelting furnace 1 are preferably adjusted to about 10% coke size <10mm or below, about 80% 10 to 20mm and about 10% 20mm or over. Further, the amt. of the coke to be changed is increased or decreased according to the compsn. of the briquettes 3. As a result, the furnace condition is easily stabilized and the recovery rate of the valuable metals is improved.</p> |
