The largest destination of industrial solid waste is the building materials industry. Solid steelmaking slag waste entering the building materials market needs to be crushed, screened, and ground. Our company CHAENG (Xinxiang Great Wall Machinery) specializes in grinding equipment such as vertical roller mills and ball mills. We are committed to providing comprehensive utilization solutions for industrial waste slag resources for customers in industries of iron and steel making, cement, commercial concrete,  building materials, etc.

Application of blast furnace slag powder:

The slag contains silicate, aluminate, and a large amount of calcium-containing glassy materials (such as C2S, CAS2, C2AS, C3A, C2F, and CaSO4), which have independent hydraulic properties. Under the excitation of calcium oxide and calcium sulfate, it can harden when encountering water. After fine grinding, the hardening process is greatly accelerated. It is mainly used in the following two ways:

1. Substitute part of the cement clinker in equal amounts to reduce production costs and improve the comprehensive performance of cement.

2. It is used in the mixing plant to replace part of the cement consumption equally, improve the strength and workability of concrete, and improve the impermeability and frost resistance of concrete.

Solutions of CHAENG

At present, CHAENG has reached cooperation with Shanghai Baosteel, POSCO, Mengdian Group, Aosen Steel, and other groups to provide EPC production lines with annual outputs from 300,000 tons to 1 million tons of slag powder. The finished products can reach the S95 level, and the sales situation is good.

Slag Powder Production Line (slag grinding plant) of Shanghai Baosteel 

Slag powder production line(slag grinding plant) with an annual output of 1 million tons

Application of Steel Slag Powder

The main chemical composition of steel slag is basically similar to that of Portland cement clinker and blast furnace slag, mainly including CaO, SiO2, MgO, Fe2O3, MnO, AI2O3, and P2O5. The chemical composition of steel slag determines that the mineral phases of steel slag are mainly C3S and C2S, followed by the RO phase, namely, the complete solid solution composed of MgOFeO, MnO, and f-CaO. Because it contains a lot of C3S and C2S, it has a good cementitious property, creating a good condition for the comprehensive utilization of steel slag in cement and concrete.

Solutions of CHAENG

In view of the problem of steel slag treatment, CHAENG proposed a full process crushing and grinding treatment scheme for steel slag. The vertical roller mill is used as the main grinding equipment to help iron and steel enterprises realize the green development transformation from a "leftover feast" of steel to a "feast" of resources so that steel slag can be better used in building materials. At present, it has provided EPC production lines with annual outputs of 300000 to 600000 tons of steel slag micro powder for well-known steel enterprises such as Shagang Group, Jinxi Iron and Steel, Aosen Iron and Steel, Panzhihua, etc.

Solutions of CHAENG

The ultra-fine grinding scheme introduced by CHAENG can mix steel slag powder, fly ash, and other low-active materials in a certain proportion or add some mineral powder for ultra-fine grinding. The mill adopts an open circuit system or closed circuit system. The specific surface area of the composite superfine powder is controlled at 650-700 ㎡/kg, and the screen residue is generally controlled at 30 um ≤ 1%. Deeply stimulate the activity of slag powder, fly ash and other admixtures, and then reach the expected indicators, opening a new profit growth point for the building materials industry.

Superfine ball mill