Abstract:Objective: Cemented tailings backfill is recognized as a vital strategy for the in-situ resource utilization of tailings and the advancement of sustainable mining practices. The aim of this study is to enhance the performance of cemented tailings backfill materials and to refine the parameters of the backfilling process. Methods: Employing response surface methodology, this research systematically investigates the influence of three key variables: filling concentration (A), cement-to-sand ratio (B), and tailings gradation (C), on the rheological properties and the compressive strength of the backfill slurry. Results: The study reveals that variations in mass concentration exert a more pronounced effect on the rheological properties than the cement-to-sand ratio and the gradation of tailings particles. The compressive strength of the backfill is positively correlated with increased concentrations and cement-to-sand ratios, albeit with a diminishing rate of strength gain as these parameters escalate. The significance of the single-factor impact on compressive strength is hierarchically ordered as B > A > C. The optimal mixture parameters for the slurry are identified as a tailings concentration of 69%, a cement-to-sand ratio of 1:8, and a Type I tailings gradation. Significance: The insights garnered from this research are instrumental in propelling the evolution of tailings cemented backfill technology and serve as a foundation for its practical implementation, contributing to the broader goals of environmental sustainability and resource efficiency in the mining industry.