Here, "silicate slag" refers to solid by-products or waste with silicate as the main constituent, generated and discharged by high-temperature reactions or melt cooling during metallurgical, building-material, chemical and energy industrial production processes, typically containing silica, calcium oxide, magnesium oxide, alumina and small amounts of metal oxides. After such silicate slag has lost its original function in use or been discarded, following crushing, sorting, stabilization and processing it can be used as a raw material for cement, concrete, road engineering or other building materials, achieving resource recovery.