Influence of the granulation conditions and performance potential of granulated blast-furnace slag – Part 1: Granulation conditions

Laboratory granulation is highly suitable as a means of demonstrating both the influence of different chemical compositions of granulated blastfurnace slags on their reactivity and the influence of different granulation conditions on the physical properties of granulated blastfurnace slag. The first part of this article deals with the granulation conditions.

1 Introduction

As a rule the liquid blastfurnace slag, which is usually at temperatures of 1440–1540 °C, is cooled rapidly in a steel works by quenching with a large excess of water (about 10:1). This breaks down the stream of slag into particles < 5 mm that very largely solidify in vitreous form. The wet granulated blastfurnace slag is dewatered in silos or in open-air stores but because of its granulometry and its more or less porous structure it still contains water when it is made available for cement production. Not only must this moisture be transported but it also has to be almost...

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