| 摘要 |
PURPOSE:To improve the utilization rate of slag of steel-making furnace by adding a specific amt. of a reducing agent to molten slag from a steel-making furnace such as converter then cooling the slag slowly and recovering the particle iron contained therein while grinding the slag finely. CONSTITUTION:A solid reducing agent of an amt. smaller than that required for reducing the iron oxide contained in the molten slag produced from a steel making furnace such as converter is added to said slag and both are mixed. Part of the iron oxide in the slag is reduced to iron, and since the amt. of the reducing agent is small, the iron of a small content of P is reduced without reduction of P2O5 in the slag. While the reduced iron is slowly cooled to solidify at <=20 deg.C/min cooling rate, the grain sizes of the reduced iron are grown large. In the process of grinding the reduced iron finely after the solidification, the granular iron is recovered with a magnetic separator, and the slag is ground finely. Since the ground slag is utilized as raw materials for fertilizers, cement, etc., the effective utilization rate thereof is improved. |
