The term "Coal-fired ash and slag, for recycling" here refers to the solid residues, including fly ash and bottom ash, generated and collected from coal-fired power plants or industrial boilers during the combustion process. After losing their original fuel function or being discarded, such ash residues undergo processing treatments such as classification, grinding, and grading, enabling them to be reused as supplementary cementitious materials, concrete admixtures, highway construction materials, or soil amendment materials, thus entering resource recovery and reuse pathways.