What is Slag


Slag is an industrial waste that is excluded in the iron making process. In the blast furnace iron making process, in addition to iron ore and fuel, in order to reduce the smelting temperature, an appropriate amount of limestone is added as a co-solvent, and they are decomposed in the blast furnace. Calcium oxide, magnesium oxide and waste ore in iron ore, as well as ash in coke are dissolved together to form a melt with silicate and aluminosilicate as the main components floating on the surface of molten iron, which is regularly discharged from the slag discharge port , which is quenched by air or water to form granular particles, which is granulated blast furnace slag, referred to as "slag". Slag is a material with "latent hydraulic", that is, it is basically non-hydraulic when it exists alone, but under the action of some activators (lime, clinker powder, alkalis, gypsum, etc.), it exhibits hydraulic performance.

The use of slag


1. Cement production:

As the raw material for producing Portland slag cement, granulated blast furnace slag is mixed with Portland cement clinker, and 3~5% gypsum is added for mixing and grinding to make Portland slag cement, which can be better used in water projects and seaports, and underground engineering, etc.

2.Concrete production:

It can be used to produce slag bricks and wet rolled slag concrete products.

3.Slag concrete production:

Put water slag and activator (cement, lime and gypsum) in a wheel mill and add water to make mortar, then mix with coarse aggregate to form wet rolled slag concrete.

4.Road and railway engineering:

Slag crushed stone concrete can be prepared and has a wide range of applications in road and railway engineering.

5.Lightweight concrete:

Application of Expanded Slag and Expanded Beads Expanded slag is primarily used as a lightweight aggregate to make lightweight concrete.


Slag milling process


The composition of slag raw materials

Steelmaking, casting blast furnace slag32-4932-416-172-130.1-40.2-40.2-2--
Manganese iron slag25-4721-377-231-93-240.1-1.70.2-2--
Vanadium iron slag20-3119-3213-177-90.3-1.20.2-1.90.2-16-250.06-1

Slag Powder Making Equipment Selection Program

FinenessUltrafine and deep processing(420m³/kg)
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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