AN APPARATUS AND AN IMPROVED METHOD OF MORE UNIFORM STEAM CURING OF STEEL MAKING SLAG WITH EFFICIENT RADIAL DISTRIBUTION OF STEAM

摘要

The present invention provides a method for steam curing of steel making slag including reduction of free alkaline earth oxide with volume expansion less than 2% by injecting steam in a vessel charged with slag under variable conditions of pressure and temperature in shorter time compared to prior Arts. The slag is crushed and ground to a size of 6-80 mm and is charged into the apparatus (V) at normal temperature through a conveyor belt (8). The half top of the vessel (V) is closed tight enough to maintain the pressure substantially higher than atmosphere. Steam is passed via a moisture separator (10) to the vessel (V) through a nozzle arrangement disposed in the middle of a disc type arrangement provided at the bottom of the vessel when the interior of the apparatus (V) is maintained under a pressure of 2.5 --3.5 Kg/cm2 for a period of 24 to 72 years at a bed height of 2m. of steel making slag. The hot condensate is taken out continuously as a neutralising agent and the pressure of the vessel is made equal to atmospheric pressure when the slag is discharged from the vessel (V) and collected in storage tank (11).