PRODUCTION OF BLAST FURNACE SLAG

摘要

PURPOSE:To obtain selectively glassy and crystalline slag products by providing a rotating body in which a cooling medium is passed and which rotates in one way and a stationary cooler which is positioned oppositely to said body apart at a specific space therefrom, and passing molten slag in the space between said body and cooler. CONSTITUTION:Molten slag is admitted through a molten slag inflow port C into a treating device for blast furnace slag consisting of a rotating body A in which a cooling medium is passed and which rotates in one way and a stationary cooler B which has the smooth surface positioned oppositely to the outside peripheral surface of the body A in its section moving at >=120 deg.C rotating angle so as to maintain a specified space F from the body A and in which the cooling medium is passed. The molten slag is granulated and cooled at such rotating speed at which the temp. of the slag in the discharging port D for solidified slag attains <=820 deg.C (the lower limit temp. for crystallization). The glassy slag is thus obtd. The crystalline glass is obtd. by granulating and discharging the slag at such a rotating speed at which the temp. of the slag in the port D attains 820-1,100 deg.C (the lower limit temp. for remelting of the slag) and cooling the slag to a specified temp. after holding hot the slag for 15-120min in the above- mentioned temp. range.