Vitreous blast furnace slag mfg. plant - where molten slag is poured into deep grooves between metal plates for rapid solidification

摘要

The molten slag leaving a blast furnace flows down a chute and a funnel onto the top surfaces of rectangular, metal cooling elements (2); and elements (2) are joined together to make an endless conveyor belt travelling horizontally below the stream of slag and mounted on a pair of rollers. Each element consists of a row of parallel metal plates (14) with tapered top edges. Plates (14) are spaced apart, so they form deep, narrow cooling grooves (13) aligned parallel with the longitudinal direction of travel of the conveyor belt. The top edge of each groove (13) is 3-10 mm wide, and the groove depth is 2-20 times its width. The slag flows into grooves (13) so it is rapidly cooled and solidified to form a vitreous granulate. In the bottom part of each groove is a sliding plate used to eject the granulate. The vitreous slag obtd. is practically water-free, and is suitable for use in cements or for mfg. a calcium-silicate fertiliser.