Abstract
In order to reveal the effect of grinding aids and size of grinding media on grindability of water-quenched glassy slag of blast furnace, dry fine grinding has been carried out using tumbling and vibrating ball mills. Triethanolamine (TEA) was found to be excellent grinding aid, and the slag was ground most effectively when small amount of TEA was added every 10 hours. In the single ball-size system, it would be effective when balls of large size are changed to balls of small size after some extended grinding. Grinding efficiency can be also improved in single stage grinding using a mixture of 20mm diameter and 5mm diameter balls as well as a single ball-size system of 5mm diameter balls. The reaction between the ground slag and water, by which calcite is formed in the drying process, becomes active with the progress of grinding.
