The ball mill with dryer for blast furnace slag requires higher power consumption. Improvements in thegrinding process for fine granulated slag was achieved withcement manufacturing technology such as the following:

The installation of GGBS vertical mill. In a vertical mill, drying, grinding, and classifying of ground material are done simultaneously. The hot air used for drying is supplied with a hot wind generator. Slag contains iron grain, which could damage the rotating table and aggravate grinding efficiency. Hence, the removal of these iron grains before commencing the grinding process, using an external circulation system with a magnetic-separator device, which is crucial.

The installation of pre-grinding equipment. A vertical mill for pre-grinding is installed in the upstream of the existing ball mill. pre-grinding and finishing grinding processes are performed separately. Reduction in the size of balls used in the ball mill is expected to improve grinding efficiency.

Benefits:

1. Good return on investment

2. Reducing the power consumption of slag micro powder preparation effectively.

3. Reducing the environment pollution effectively in the process of slag powder preparation.

4. Removing iron effectively, increasing additional income.