Volume 28: Closing Carbon Cycles – A Transformation Process Involving Technology, Economy, and Society: Part III

Technology of free calcium oxide (f-CaO) digestion in steel slag by origin adjusting under the vision of carbon neutralization Guangju Ma, Rongjiang Zhang, Wei Guo, Xifeng Liu, Guoming Lv, Benren Wang, Suke Yang, Bolun Yang, Zhiqiang Wu

Abstract

The carbon emissions of the steel industry are enormous. In addition, a large amount of solid waste will be generated in the steelmaking industry. Therefore, the efficient utilization of solid waste in the steelmaking industry is significant for energy saving and carbon reduction. Steel slag is a by-product of the steelmaking process, a bulk industrial solid waste. At present, the comprehensive utilization rate of steel slag in China is less than 30%. Excessive f-CaO content in steel slag is one of the main factors limiting its utilization and will lead to the volume expansion of steel slag during the slow hydration process. The traditional f-CaO digestion method cannot improve the performance of the steel slag from the source, and the sensible heat recovery of the steel slag cannot be carried out. Therefore, the origin adjusting technology, which utilizes the sensible heat of steel slag and can modify the steel slag, has gradually attracted attention. This paper takes the steel slag of a steel plant in Shanxi as the research object. After analyzing its steel slag data, a scheme of origin adjusting is proposed, and the relevant influencing factors are analyzed.

Keywords Energy saving and carbon reduction; Steel slag; f-CaO, Origin adjusting; Sensible heat recovery