Method producing slag ballast
AssigneeNippon Steel Corporation
InventorsKunio Nakamura, Mitsuo Takahashi
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Abstract
In producing slag ballast from molten slag obtained from metal smelting processes, molten slag is poured into a revolving cylinder which is supported in an inclined position, and the whole external peripheral surface of which serves as the cooling surface, and the molten slag is cooled at a rate exceeding 20.degree. C/min. As the molten slag is cooled while it moves forward in the revolving cylinder, it is broken up into medium sized lumps to become slag ballast.
Claims8
A method of producing slag ballast having a low S.sup.2- ion concentration by cooling molten slag containing a high proportion of sulfur and which is obtained in metal smelting processes, which method comprises:
- a. introducing molten slag into the upper end of an inclined revolving cylindrical body having an external peripheral cooling surface;
- b. cooling the said external peripheral surface for cooling the slag at a cooling rate in excess of 20.degree. C./min. until solidification of the slag takes place for reducing the S.sup.2- ion concentration of the cooled slag to a level not exceeding 5 ppm;
- c. moving the solidified slag forward and tumbling the slag in the revolving cylindrical body as it is being cooled for crushing the slag;
- and
- d. discharging the cooled, broken and lumpy slag from the revolving cylindrical body through the lower end thereof.
Dependencies are inferred from the claim text.