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 was increased 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 was about 5.5 liters and has 12 impellers. Sample used was limestone. The feed mass was 6kg and the feed size was 13-20mm.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 0.17 μm, the size distributions were measured by a laser diffraction and scattering method. The progress of grinding was evaluated by the increasing rate of submicron or micronized particles in products.As a result, the following experimental equation was obtained Q1=9.1×10-5 (nt) 0.60, where Q1 is the mass fraction of submicron particles, n, the rotational speed of impeller and t, grinding time.
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