Optimization of Preparation Process for Fly Ash-Steel Slag Based Ceramic Tiles

doi:10.16552/j.cnki.issn1001-1625.2025.0496

Abstract

Abstract: The main raw materials of this study were steel slag and fly ash, with quartz sand as the auxiliary material. Based on the synergistic effect of steel slag and fly ash, fly ash-steel slag (CaO-MgO-SiO₂-Fe₂O₃-Al₂O₃) based ceramic tiles were prepared. The effects of raw material ratios and process parameters such as molding pressure (15~35 MPa), sintering temperature (1 165~1 190 ℃), and holding time (30~60 min) on the physical and mechanical properties of ceramic tiles were investigated. The results show that the optimal mass ratio is m₁(steel slag)∶ m₂(fly ash)∶ m₃(quartz)=9∶8∶4, and the influence of fly ash content is the most significant. The density of the ceramic body is the best at a molding pressure of 25 MPa, and excessive pressure led to crystal fracture. The diffraction peak intensity is the highest, the fracture modulus is the largest, and the water absorption is the lowest at a sintering temperature of 1 180 ℃. The grain arrangement is the densest and the mechanical properties are the best at a holding time of 60 min. Under the optimized process (25 MPa molding pressure, sintering at 1 180 ℃ and holding for 60 min), porcelain tiles with gehlenite (Ca₂Al(AlSi)O₇) and diopside (CaMgSi₂O₆) as the main crystal phases are prepared, with a fracture modulus as high as 69.86 MPa and a water absorption as low as 0.12%.

Key words: steel slag, fly ash, ceramics, gehlenite, diopside, mechanical property

CLC Number:

X705

JI Ying, SU Huxiong, LIU Baolin, CHEN Huan, LIU Shibin, WU Jiarui. Optimization of Preparation Process for Fly Ash-Steel Slag Based Ceramic Tiles[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(12): 4413-4424.

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