What is Blast Furnace Slag


Blast furnace slag, also known as water slag  is the product that is discharged from the blast furnace after melting non-ferrous components in iron ore, coke, and injection coal ash when iron and steel companies melt pig iron. It is mainly a crystalline block, honeycomb or rod shape, mainly glass body fine particles, light yellow (some dark green crystals), glass luster or silky luster, Mohs hardness of 1 ~ 2, (natural accumulation) specific gravity 0.8~1.3t/m3. There are two main methods: slag pool water quenching and furnace water quenching. It has potential hydraulic cementing properties and can exhibit hydraulic cementing properties under the action of activators such as cement clinker, lime, and gypsum, making it a high-quality cement raw material.

The use of blast furnace slag


1. Cement industry:

It has potential hydraulic cementing properties and can be used as a cement mix or made into clinkerless cement. The types of cement produced include Portland slag cement, gypsum slag cement, lime slag cement etc.

2. Concrete industry:

As a concrete mineral mix, the slag powder can be directly mixed into commercial concrete instead of cement in the same amount. According to the difference in activity and specific surface area, the performance of concrete mixed with slag powder in a certain proportion is obviously improved. Slag powder is especially suitable for special projects such as high-rise buildings, dams, airports, underwater and underground buildings.


Blast furnace slag milling process


Blast Furnace Slag Powder Making Equipment Selection Program

ModelVertical mill

Stage 1: Crushing of raw materials

The material is crushed by the crusher to the fineness that can enter the mill(15mm-50mm).

Stage 2: Grinding

The crushed small pieces of material are sent to the storage hopper through the elevator,and then sent to the grinding chamber of the mill evenly and quantitatively through the feeder for grinding.

Stage 3:Classification

Through classification, the coarse powder will return to main mill to grind again.

Stage 4:Collection of finished products

The powder that meets the fineness enters the dust collector through the pipeline with the air flow for separation and collection, and the collected finished powder is sent to the finished product silo by the conveying device through the discharge port, and then is packaged uniformly.


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