Siliceous residue is a solid waste generated during the production processes of metallurgical or chemical enterprises, whose main chemical components are SiO₂ and Al₂O₃. To achieve its resource utilization, this study, in accordance with relevant national standards, conducted a comprehensive detection of the chemical composition, pozzolanic activity, potential hydraulic properties, radioactivity, and leachable heavy metal content of metallurgical siliceous residue around Tongling City. The results indicate that all indicators of this siliceous residue meet the technical requirements for cement admixtures, and it has the basic application conditions as an admixture for P·O42.5 cement. Further small mill tests and large mill tests revealed that when 3.0% siliceous residue was used to replace fly ash in cement production, the cement setting time was shortened by approximately 20 minutes, the water demand for standard consistency decreased by 0.4%, the fluidity of the standard consistency paste increased by 44mm, and the 3d and 28d compressive strengths showed slight improvements. The annual comprehensive economic benefit is estimated to be approximately 2 million CNY. This study has provided a scientific theoretical basis and a feasible technical solution for the resource utilization of siliceous residue.