Determination of the some grinding properties of different barite ores by conventional mills

Öz

The particle size distributions of the different barite ore samples were obtained by dry grinding in the conventional mills. The ball media and rod media produced different products for nearly pure barite and the gang associated barite samples. Four different barite samples were subjected to grinding tests. The -212 µm size fraction was obtained for high BaSO4 grade barite samples of B1 and B2 at 8 minutes from the ball media and 3 minutes from the rod media employed. On the other hand, the same size fraction was obtained for the low BaSO4 grade samples that contained gang minerals (mostly quartz) of B3 and B4 at 16 minutes for the ball media and at 6 minutes for the rod media. The slowing down effect which is caused by fine particles accumulation in the mills was reached at shorter grinding times for the high grade barite samples of B1 and B2.

Anahtar Kelimeler

• Barite
• Grinding
• Ball mill
• Rod mill
• Slowing down effect.

Farklı barit cevherlerinin konvansiyonel değirmenlerde bazı öğütme özelliklerinin belirlenmesi

Öz

Farklı kompozisyonlardaki barit cevheri numuneleri konvansiyonel değirmenlerle kuru öğütülerek tane boyut dağılımları elde edilmiştir. Safa yakın ve gang içeren numuneler bilyalı ve çubuklu ortamlarda öğütülerek elde edilen ürünler farklılıklar göstermiştir. Dört farklı barit cevheri öğütme testlerine tabi tutulmuş olup, yüksek BaSO4 tenörlü B1 ve B2 numuneleri, bilyalı değirmende 8 dakika, çubuklu değirmende 3 dakika öğütülmeyle -212 µm tane boyut fraksiyonunu vermiştir. Diğer taraftan, düşük BaSO4 tenörlü B3 ve B4 gibi gang içerikli (çoğunlukla kuvars içeren) barit cevher numuneleri ise bilyalı değirmende 16 dakika, çubuklu değirmende 6 dakika öğütmeyle -212 µm tane boyut fraksiyonunu vermiştir. Değirmenlerde yavaşlama etkisi olayına sebep olan ince tanelerin artması, safa yakın barit numunelerinde (B1 ve B2) daha kısa öğütme sürelerinde rastlanmıştır.

Anahtar Kelimeler

• Barit
• Öğütme
• Bilyalı değirmen
• Çubuklu değirmen
• Yavaşlama etkisi.

Kaynakça

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