As a by-product of the iron and steel industry, steel slag is rich in catalytically active substances and can therefore be used as a solid catalyst. Many studies have shown that the application potential of steel slag in catalysis is huge, which provides new development space for its application, thereby increasing its additional utilization value. This article primarily reviews the research progress in catalytic fields such as catalytic pyrolysis, organic degradation, electrocatalysis, photocatalysis, transesterification, and carbon capture and storage, as well as the modification methods of steel slag. The catalytic performance of the modified steel slag has been further improved, and it has the meaningful characteristics of high efficiency, cleanliness, and low costs.
Crystallization of molten blast furnace slag directly affects the fibre forming rate and stability of fibre. The single hot thermocouple technique was used to investigate the crystallization behaviour of modified blast furnace slag. The results revealed that, with increasing acidity coefficient of modified blast furnace slag during the isothermal process, the initial crystallization temperature of modified blast furnace slag gradually decreased, which were at 1390°C, 1330°C and 1180°C, respectively, and TTT curves changed from double C-type curve to single C-type curve. Through a continuous cooling process, the critical cooling rate decreased from 6°C s −1 to 0.5°C s −1 when the acidity coefficient of modified blast furnace slag increased from 1.05 to 1.40. Based on these findings, we conclude that, the crystal growth rate is controlled by diffusion driving force and undercooling driving force.
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