The term "calcium carbide slag" here refers to the by-product generated during the process of producing acetylene gas by reacting calcium carbide with water, primarily composed of calcium hydroxide and minor impurities. After collection, dewatering, drying, and classification processes, this type of calcium carbide slag, once it has lost its original reactivity or is discarded, can be recycled and reused as a supplementary material in construction materials, cement retarder, soil conditioner, or environmental remediation material.