WANG Lingyun ¹, LIANG Yonghe ¹, NIE Jianhua ¹ ,QIU Wendong ², YIN Yucheng ¹, CAI Manfei ¹
(1. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081,
Hubei, China; 2. Shanghai Baosteel Industry Technological Service Co., Ltd., Shanghai 201900, China)

Abstract: An environment-friendly tap-hole clay that contains almost no benzo[a]pyrene (BaP) was developed using resin as binder. The effects of the binder addition on the tap-hole clay was studied through the evaluations of physical and chemical properties together with the microstructure, phase compositions and thermal analysis. With the increase of the binder addition, the Marshall value, bulk density (BD), cold crushing strength (CCS), hot modulus of rupture (HMOR) and slag resistance decreased, while the apparent porosity (AP) increased, which has a close relationwith the evaporation of resin components at 1100°C. Meanwhile, this also caused the significant linear change (LC) of taphole clay. Mullite formation caused by kyanite decomposition or the Al₂O₃ and SiO₂ in situ formation negated some shrinkage, having a great effect on AP, BD and CCS after firing at 1400°C. It is suggested that 17 wt.% of resin is helpful to improve the properties of tap-hole clay.

Key words: environment-friendly; benzo(a)pyrene; binder; tap-hole clay