Method and apparatus for granulating blast furnace slag

Details Method and apparatus for granulating blast furnace slag Method and apparatus for granulating blast furnace slag

C - Chemistry, Metallurgy

04

B

39/116, 49/77.5

C04B 5/02 (2006.01) C21B 3/08 (2006.01)

Patent

CA 1117297

ABSTRACT OF THE DISCLOSURE Slag sand is produced by first mixing a stream of mol- ten slag with a quantity of between 0.5m3 and 0.7m3 of water per ton of slag to chill the slag while leaving it above the pyro- plasticity threshold. Thereafter water at a rate of between 0.3 m3 and 0.4m3 is added to the slag to stiffen the stream and this stiffened stream is fed to a drum rotating at a rate between 600 rpm and 1000 rpm to break it up into fine granules which are collected on a foraminous belt. The granulated slag produced has an extremely low moisture content so that it is ideally suited for use in slag cements.

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