Ground Granulated Blast Furnace Slag

Authors: Rafat Siddique Mohammad Iqbal Khan

Publish Date: 2011

Volume: , Issue: , Pages: 121-173

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Abstract

Ground granulated blast furnace slag GGBS is a byproduct from the blastfurnaces used to make iron Blastfurnaces are fed with controlled mixture of ironore coke and limestone and operated at a temperature of about 1500°C When ironore coke and limestone melt in the blast furnace two products are produced—molten iron and molten slag The molten slag is lighter and floats on the top of the molten iron The molten slag comprises mostly silicates and alumina from the original iron ore combined with some oxides from the limestone The process of granulating the slag involves cooling of molten slag through highpressure water jets This rapidly quenches the slag and forms granular particles generally not bigger than 5 mm The rapid cooling prevents the formation of larger crystals and the resulting granular material comprises around 95 noncrystalline calciumaluminosilicates The granulated slag is further processed by drying and then grinding in a rotating ball mill to a very fine powder which is GGBS

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