Abstract
It is significant to establish new usage of slag, discharged from gasifier of integrated coal gasification combined cycle power generation system (IGCC), by adding higher value on slag. Because it will be a good help to promote the spread of IGCC technology all over Japan. In previous reports, appropriate range of chemical composition of slag for high quality artificial light-weight aggregate. But the technique is required to modify foaming characteristics of slag, whose composition is not within that appropriate range. In this report, the fact is confirmed that foaming characteristics of slag is modified by adding some particles mainly consist of fly ash from pulverized coal furnace. IGCC can change fly ash from pulverized coal boiler into useful light-weight aggregate. We added three data of foaming characteristics of unexamined slag. One of them expanded to float on the water. The ratio of absorption of this extremely light-weight expanded slag particle is as same as expanded obsidian, it is expected as substitution of expanded obsidian, used to improve soil drainage and so on.
