Steel slag is the waste residue generated in the metallurgical industry

Steel slag is a waste slag generated in the metallurgical industry, with a production rate of 8% to 15% of crude steel production. In 2012, the world's steel slag discharge was approximately 180 million tons. The production of steel slag in China is rapidly increasing with the rapid development of the steel industry. Therefore, the treatment and resource utilization of waste slag in steel enterprises are also receiving increasing attention.

The national "Eleventh Five Year Plan" development plan points out that the comprehensive utilization rate of steel slag should reach over 86%, basically achieving "zero emissions". However, the current situation of comprehensive utilization in China is far from the plan, especially the utilization rate of converter steel slag, known as "inferior cement clinker," is only 10% to 20%. The steel slag generated by domestic steel enterprises cannot be processed in a timely manner, resulting in a large amount of steel slag occupying land and polluting the environment. However, steel slag is not an unusable solid waste, which contains a large amount of usable components such as slag steel, calcium oxide, iron, and magnesium oxide. Therefore, in order to create economic and environmental benefits for steel enterprises, it is necessary and urgent to choose appropriate treatment processes and utilization pathways to develop the reuse value of steel slag