화학공학소재연구정보센터
Powder Technology, Vol.382, 556-565, 2021
Effect of grinding media properties and stirrer tip speed on the grinding efficiency of a stirred mill
Owing to their high energy efficiency, stirred mills are commonly used in the fine or ultrafine grinding of low-grade and fine disseminated ores to enhance liberation. In this study, batch wet grinding studies were conducted in a stirred mill to evaluate the effect of the grinding media density, grinding media diameter, and stirrer tip speed on the ground products and specific energy input. The population balance model was used to simulate the particle size distribution of the ground products. The results obtained indicated that the breakage rates S-1 and S-2 were highly dependent on the operating parameters, while the breakage distribution value b(21) was independent of the grinding media density and stirrer tip speed. Additionally, it was observed that the yield of the desired size (-45 + 10 mu m) of ground products increased with grinding media diameter. With the increase of grinding media density and stirrer tip speed, the time efficiency of the grinding process was improved. Moreover, the attainable region method via a contour plot was used to produce the maximum amount of the desired size with lower energy. Furthermore, the results revealed that the grinding process became energy inefficient when the grinding time was close to the turning point. (C) 2021 Published by Elsevier B.V.