What is the best use of steel slag?

The main utilization way of steel slag in China is to recycle it in iron and steel companies, instead of lime as solvent, and return it to blast furnace or sintering furnace as ironmaking raw material. It can also be used as highway subgrade, railway subgrade, cement raw material and soil improvement.

The treatment processes of steel slag mainly include cold discarding method, hot splashing method, splash plate water cooling method and steel slag water quenching method.

It can be used as metallurgical raw materials: used as sintering solvent, solvent for blast furnace or cupola, return slag for steelmaking, and recovery of scrap steel by magnetic separation process.

Can be used as building materials: Because steel slag contains active minerals such as tricalcium silicate, dicalcium silicate and iron aluminate similar to cement, it has hydraulic gelling properties, so it can be used as raw materials and admixtures for producing clinker-free or clinker-free cement. At the same time, steel slag macadam has the characteristics of high density, high strength, rough surface, good stability, good wear resistance and durability, and firm combination with asphalt, so it is widely used for backfilling of railways, highways and projects, especially for road construction and land reclamation in swamps and beaches.

It can be used in agriculture: it can be used as phosphate fertilizer for steel slag, which contains trace elements such as zinc, manganese, iron and copper, and also plays a fertilizer effect on different soils and different crops lacking such trace elements. Used as silicon fertilizer. As an acid soil improver.

Steel slag mainly comes from oxides formed by oxidation of elements contained in molten iron and scrap steel, impurities brought by metal charge, added slagging agents such as limestone, fluorite and silica, oxidants, desulfurization products and corroded lining materials. The main components of steel slag are oxides such as calcium, iron, silicon, magnesium, aluminum, manganese and phosphorus.