Abstract
The stirred mill is regarded as one of the most efficient devices for micronizing materials and has come to be actively used for preparation of fine particles. Recently, the demand for ultrafine particles is increasing in many kinds of industries.
In this paper, an autogenous grinding to get submicron or micronized particles based on frictional action of feed material has been carried out using a stirred mill. The mill used was made of stainless steel and its volume wasabout 5.5 liters and has 12 impellers. Samples used were silica glass and limestone. The feed mass was 5kg and the feed size was 20-13mm. In the present work, a operating parameter was stirring speed. The ground products were sieved in the size range from feed size to 325mesh (45μm), and from 45 to 0.17μm, the size distributions were measured by a laser diffraction and scattering method. The progress of grinding was evaluated by the increasing rate of fine particles. The effect of properties of samples on the grinding rate was studied.
As a result, It was found that an autogenous grinding with a stirred mill was more effective method for producing fine particles of limestone which is not elastic solid than silica glass which is nearly perfect elastic solid.
