1. 1) World Steel Association: Steel statistical yearbook 2017, https://www.worldsteel.org/zh/media-centre/press-releases/2018/World-crude-steel-output-increases-by-5.3--in-2017.html, (accessed 2018-01-24).
2. 2) Y. Li and W. B. Dai: J. Clean. Prod., 175 (2018), 176.
3. 3) W. B. Dai, Y. Li, D. Q. Cang, Z. B. Liu and Y. Fan: ISIJ Int., 54 (2014), 2672.
4. 4) L. H. Zhao, Y. Li, Y. Y. Zhou and D. Q. Cang: Mater. Des., 64 (2014), 608.
5. 5) D. Mudersbach, P. Drissen and H. Motz: 2nd Int. Slag Valorization Symp., Research group for High Temperature Processes and Industrial Ecology(HITEMP), Department of Materials Engineering, KU Leuven, Leuven, (2011), 299.