Ｗｏｒｋ Ｉｎｄｅｘに基づく乾式，湿式粉砕の微粉砕性の比較

Abstract

In our previous paper, we proposed a corresponding Work Index Wi. c which is proportional to the Work Index Wi. Wi. c can be determined from the zero-order increasing rate constant in a ball mill grinding.In this paper, we propose an application of Wi. c to compare fine grindability in dry and wet grinding. The grinding tests were carried out by using a mill made of alumina with a diameter 144mm and grinding balls of alumina with a diameter 20mm. The feed sample was silica glass with density of 2, 150kg·m-3 and vickers hardness of 465kgf·mm-2. In the case of wet grinding, the volume of water added was twice of the feed sample.The relationship between Wi. c and the particle size was studied in dry and wet grinding. As a result, Wi. c in wet grinding was smaller than Wi. c in dry grinding. It was suggested that Wi. c could be useful for evaluating a fine grindability in dry and wet grinding.