Blast furnace slag GGBS grinding plant

GGBS refers to ground granulated blast furnace slag, it also known as GGBFS. It is obtained by quenching molten iron slag from a blast furnace in water or steam. The slag grinding plant (GGBS plant) is a production line that processes slag raw materials to obtain slag powder products that meet the requirements.

GGBS application

GGBS is primarily a binder used as an addition to cement which uses the latent hydraulic properties of GGBS to produce Portland blastfurnace cement (6-35% of GGBS) or blastfurnace cement (36-90% GGBS) produced by blending at the concrete mixer, or as a factory blend at the cement factory. As a new admixture of high performance concrete, GGBS powder has the advantages of improving the compressive, tensile, shear, bending and other properties of concrete.

Process of GGBS grinding plant

1.The bulk slag materials are crushed by the jaw crusher, then it will be sent to the storage bin by the bucket elevator.
2.Next, the material is evenly, quantitatively, and continuously sent to the slag grinding mill by the electromagnetic vibrating feeder.
3.After grinding, under the action of blowing, all slag materials will be sent to the powder separator for sorting, the unqualified powder after sorting falls back to continue grinding, and the qualified fine powder is sent to the storage bin through the pipeline.
4.Finally, the finished slag powder is output through the discharge valve.

How to choose slag grinding mill?

There are two grinding processes for slag powder: ball mill and vertical roller mill. Each has its own advantages and disadvantages.

Ball mill system is a traditional process for slag grinding. It has strong adaptability to materials, large specific surface area, better particle shape than vertical mill, simple maintenance, and cheap accessories. However, it occupies a large area, consumes a lot of electricity, and needs to dry the materials separately, which makes the process complicated.

Vertical roller mill  is a slag grnding system that has developed rapidly in recent years. The process is simple. Drying, grinding, and powder selection are all completed in the mill. It has low investment, low unit power consumption, and fast heat transfer, but it is more difficult to maintain than ball milling. In recent years, the comprehensive benefits of vertical mills in cement industry due to their advantages in energy saving and consumption reduction have become more and more obvious. They have also been widely used and promoted in the power, metallurgy, chemical, non-metal and other industries.

1. Ball mill production process

The slag is transported into the factory by truck and stored in the storage area. The material is taken by the forklift, and after being measured by the hopper and quantitative feeder, it is sent to the dryer by the belt conveyor for drying. The dried slag enters the ball mill for grinding. The ground mineral powder is sent to the powder selector for classification by the bucket elevator, and the qualified particle size is transported to the finished product bin by the air chute and elevator. The large-particle mineral powder returns to the ball mill for re-grinding. A dust collector is set at the discharge end of ball mill, and the fine powder collected by the dust collector is transported to the finished product bin by the air chute and elevator. The drying heat source is provided by the hot air furnace.

2. Vertical mill production process

Slag is transported into the factory by truck and stored in the material storage area. The material is taken by a forklift, and after being measured by the hopper and quantitative feeder, it is directly sent to the vertical roller mill by a belt conveyor, and an iron remover is set on the conveyor for iron removal.

The slag after iron removal enters the vertical roller mill for grinding. The slag powder after drying and grinding is collected by the bag type dust collector and transported to the finished product bin by the air chute and elevator. The material discharged from the vertical mill is fed back to the vertical mill through the conveyor and elevator.