Anahtar KelimelerÖğütme, Kaolen, Mikrodalga kurutma, Bilyalı değirmen, Özgül kırılma hızı Özet: Bu çalışmada; Balıkesir/Düvertepe'den alınan kaolen numunesi üzerinde dar tane boyut gruplarında (-3350+2360 μm, -2360+1700 μm ve -1180+850 μm) mikrodalga kurutmanın özgül kırılma hızına olan etkisini belirlemeye yönelik öğütme testleri yapılmıştır. Öğütme testleri Bond tipi bilyalı değirmende 70 dev/dak ile kuru olarak gerçekleştirilmiştir. Deneylerde kullanılan kaolen numunesi dar tane boyut gruplarında etüvde (105 o C' de 4 saat) ve mikrodalga fırında (850 W' da 12 dk) kurutulmuş ve kaba nem değeri (%1,5) öğütme öncesi numunelerden uzaklaştırılmıştır. Sonuçta; her üç dar tane boyut grubunda da, mikrodalga işleme tabi tutulmuş kaolen numunesinin konvansiyonel olarak etüvde kurutulmuş kaolen numunesine kıyasla kırılma hızlarında belirgin artış olduğu belirlenmiştir. Improving the Specific Rates of Breakage of Kaolen in the Ball Mill ByMicrowave Drying Keywords Grinding, Kaolin, Microwave drying, Ball mill, Specific rate of breakage Abstract: In this study, grinding tests were carried out to determine the effects of microwave drying on specific breakage rate in a ball mill. Kaolen samples, taken from Balikesir/Duvertepe, were prepared at mono size groups (-3350+2360 μm, -2360+1700 μm and -1180+850 μm) for grinding tests performed as dry in Bond ball mill which was run at 70 rpm. The kaolen samples prepared at mono size groups were dried in conventional oven (at 105 C o with 4 hours) and microwave oven (at 850 W with 12 minutes) in order to remove rough moisture value (1.5%) from the samples prior to grinding. As a result of the grinding tests it was determined that the specific rates of breakage at all three mono sized kaolen samples treated with microwave drying were faster than those of the untreated kaolen samples.
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