The slag mainly consists of calcium, iron, silicon, magnesium and a small amount of aluminum, manganese, phosphorus and other oxides. In some areas, the slag also contains little titanium and vanadium because of the ore containing those ingredients. Slags are greatly different due to the various components in steel-making furnace, steel furnace steel smelting and each different stage of the smelting process. The application of the crusher has brought new hope to the slag processing.
The approach to dealing with the slag uses the slag and the primary slag as raw materials. The processing technology includes cold abandoned method; hot pour method, splashing cold plate method, water quenching method. Generally, it uses a closed loop production process which is respectively composed by the process of crushing and screening, vacuum ball milling, classification and wind dry magnetic separation to receive four high-quality and high value-added products, which namely means that the steel scrap with a iron content greater than 90 % of high-quality can be used for high-grade iron powder iron that can be used as a cement and concrete admixture of high activity for high-grade steel slag powder and the road surface of asphalt concrete surface layer of steel slag aggregate. After the entire production process completed, it can achieve zero emissions slag with no pollution.