Technologies and prospects for resource utilization of steel slag
With the continuous increase in China's steel production,the steel industry is facing severe resource and environmental problems,especially in the treatment and utilization of steel slag.In the current steel slag treatment process,a significant amount of thermal energy from steel slag is wasted,and the process of recovering metallic iron is highly energy-intensive.Additionally,the comprehensive utilization rate of tail slag is low,with most steel slag being landfilled or stockpiled.In the context of the"carbon peaking"and"carbon neutrality"targets,the develop-ment of low-carbon and green technologies for steel slag treatment and utilization is imperative.The current main-stream processes for steel slag treatment are summarized,and the advantages and disadvantages of different methods are discussed.The main pathways for resource utilization of steel slag are concluded,and the technologies for compre-hensive utilization of steel slag in recent years are analyzed.Considering the current state of steel slag treatment and utiliza-tion,the future directions in this field are discussed and anticipated.Under the"carbon peaking"and"carbon neutrality"targets,it is essential to effectively utilize the thermal energy of molten steel slag,develop technologies for waste heat recovery and hot steel slag iron extraction,and use steel slag carbonation techniques to produce high value-add-ed products,so as to realize comprehensive recovery and utilization of heat,iron and tail slag resources.
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