Steel slag is a kind of industrial solid waste discharged in the process of steelmaking, with the rapid development of the steelmaking industry, the annual production of steel slag is increasing year by year, and the massive accumulation of steel slag not only affects the city's aesthetics, but also seriously pollutes the environment and occupies a large amount of arable land. Steel slag after crushing, screening and other processing, can be used as an important industrial raw materials, saving resources and reducing pollution.

The sources of steel slag can be roughly divided into three kinds:

1, by the steel material in the Si, Mn, P, Fe and other elements of the oxidation product that is "steel slag";

2, the smelting process to join the slag material that is "steel slag";

3, the smelting process is eroded furnace lining refractory material that is "steel slag" and so on.

Steel slag is mainly composed of calcium, iron, silicon, magnesium and a small amount of aluminium, manganese, phosphorus and other oxides. The main minerals are tricalcium silicate, dicalcium silicate, calcium and magnesium olivine, calcium and magnesium rose pyroxene, calcium iron aluminate and silicon, magnesium, iron, manganese, phosphorus oxides formed by the solid fusion, but also contains a small amount of free calcium oxide and metal iron, fluorapatite and so on. Different properties of steel slag has different application value, different temperament complexity.

Steel slag processing equipment configuration

Coarse crushing equipment: Jaw crusher, which is used for coarse crushing of steel slag processing equipment, processing capacity of 1-2200t/h, with a large crushing ratio, crushing without dead ends, affordable price, long history and other advantages.

Medium and fine crushing equipment: Impact crusher, generally used for secondary crushing after jaw crusher, with high crushing efficiency, simplified process and adjustable discharge size. Cone crusher, also used for steel slag medium and fine crushing processing equipment, higher efficiency, large output, better production process.

Screening equipment: circular vibrating screen, mainly for coarse crushing, medium and fine crushing of steel slag for screening and grading, qualified into the next process, unqualified need to return to the upper level to continue crushing and processing.

Feeding equipment: vibrating feeder, also known as feeder, can be uniform, continuous, quantitative material to the processing equipment, simple structure, easy to operate, to avoid the problem of clogging of the inlet.

Introduction of steel slag processing process

Under the action of vibrating feeder, the piled up steel slag will be evenly and continuously sent to jaw crusher for coarse crushing, the steel slag after coarse crushing passes through the vibrating screen, the qualified one enters into the impact crusher or cone crusher for medium and fine crushing, and the unqualified one returns to the upper level to continue crushing, the same steel slag after crushing by the impact crusher or cone crusher is qualified to be outputted through the conveyor, that is, it's a finished product, and the unqualified one The unqualified steel slag will be returned to the upper level for further crushing.

The use of steel slag

1、Steel slag is widely used in road bedding, structural layer, especially suitable for asphalt mix aggregate pavement layer. Such as steel slag road construction, with high strength, wear resistance and skid resistance, good durability.

2, in Western European countries with steel slag as fertiliser has a long history. Calcium, silicon, manganese and trace elements in steel slag are fertiliser, can be used as slag fertiliser applied to acidic soil.

3, China is also using steel slag to produce a small amount of steel slag cement, mostly used in converter steel slag mixed with about 50% blast furnace granulated slag, about 10% gypsum, grinding no clinker steel slag cement, or about 15% cement clinker instead of steel slag grinding less clinker cement.

4, steel slag as cement raw material, baking ferrate cement, can save energy, in addition, steel slag can also make bricks, tiles, carbonated building materials.