A Fundamental Study of Dry and Wet Grinding from the Viewpoint of Bending Tests by Drop Weight Method

The preparation of fine powders by grinding may be accomplished by either a wet or a dry process and the differences between these have been discussed. The difference of breaking strength in different atmospheres affects the grindabilities. In this study, bending tests were carried out using a drop weight method on glass material in order to investigate the quantitative effect of water atmosphere on strength. The influence of the crack length of the glass surface on the difference of fracture probability in water and in air was also studied. As a result, it was found that the fracture probability in water was larger than that in air when the input energy in specimen was constant. Then, the difference of the fracture energy in water and in air increased with decreasing the crack length

An Investigation on the Effective Use of Fly Ash ―Fine Grinding of Limestone with Fly Ash as a Grinding Aid―

In this study, the role of fly ash as a grinding aid to facilitate fine grinding of limestone for improved flowability was examined by carrying out batch grinding test for varying feed amount and grinding time, while maintaining the limestone to fly ash ratio at 5 :1. As a result, it was found that fly ash was an effective grinding aid for the fine grinding of limestone, and the optimum feed amount of limestone and fly ash to the grinding mill increased with increase of grinding time