Optimization of Wet Grinding Parameters of Calcite Ore in Stirred Ball Mill

This study focused on ultra-fine grinding of calcite powder (CaCO3) using a vertical stirred ball mill. The influences of various operating parameters such as stirrer speed (rpm), ball filling ratio (J), powder filling ratio (fc), solid ratio (wt.%) and grinding time were studied under wet conditions. The experiments were carried out in a batch mode of operation. The experimental results were evaluated based upon product size (d50), specific surface area (m2/g) and width of particle size distribution. As a result of this work, the optimum grinding test conditions were found to be 840 rpm for stirrer speed, 0.70 for ball filling ratio, 0.100 for powder filling ratio, 50% for solid ratio and 20 min for grinding time. It was also observed that stirrer speed, ball filling ratio and grinding time were directly proportional whereas powder filling ratio and solid ratio were inversely proportional to product fineness and specific surface area. The width of particle size distribution decreased with decreasing product size for all grinding conditions.

Karıştırmalı Bilyalı Değirmende Kalsit Cevherinin Yaş Öğütme Parametrelerinin Optimizasyonu

Bu çalışma, kalsitin (CaCO3) dikey karıştırmalı bilyalı değirmen de çok ince öğütülmesi üzerine odaklanmıştır. Karıştırma hızı (rpm), bilya doluluk oranı (J), malzeme doluluk oranı (fc), katı konsantrasyon oranı (%) ve öğütme süresi (dak.) gibi çeşitli çalışma parametrelerinin etkileri yaş öğütme koşullarında incelenmiştir. Deneyler, kesikli öğütme şartlarında gerçekleştirilmiştir. Deney sonuçları ürün boyutu (d50), özgül yüzey alanı (m2/g) ve tane boyut dağılımı genişliğine göre değerlendirilmiştir. Bu çalışma sonucunda, optimum öğütme test koşulları karıştırıcı hızı için 840 d/d, bilye doluluk oranı için 0,70, malzeme doluluk oranı için 0,100, katı oranı için %50 ve öğütme süresi için 20 dakika olarak bulunmuştur. Karıştırma hızının, bilya doluluk oranının ve öğütme süresinin ürün inceliği ve spesifik yüzey alanı ile doğru orantılı olduğu, malzeme doluluk oranı ve katı konsantrasyon oranı ile ters orantılı olduğu gözlenmiştir. Ayrıca, tüm öğütme koşulları için tane boyut dağılımı genişliği azalan ürün tane boyutu ile azalmıştır.

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