THE EFFECT OF GRINDING MEDIA PERFORMANCE ON WET MILLING OF CALCITE

Yıl 2019, Cilt: 7 Sayı: 2, 379 - 386, 01.06.2019

Diler Katırcıoğlu Bayel

https://doi.org/10.15317/Scitech.2019.206

Öz

This study aimed to conduct systematic research on
the design of high-density zircon (ZrO₂) grinding media (0.2-1 mm)
in a laboratory-scale media mill (750 ml) for wet grinding of calcite (CaCO₃,
d₅₀= 5.4 µm). Sub-micron grinding experiments were carried out by
using different amounts of finer grinding media (25%, 50% and 75%) and
different size ratio of finer-coarser media (0.2 and 0.5). Besides, the surface
areas (S_bw, m²/kg) of grinding media on grinding performance
were investigated. If the best experimental results are compared (M1 and M4),
it is found that the S_bw of the bimodal media(M4) is 75%
larger compared to that of monosized media (M1). The experimental results were
analyzed based on product size (d₅₀, d₈₀), cumulative
undersize curves and specific surface area (S_W, m²/g). The findings
showed that only the finer grinding media was not very effective at 600 rpm.

Anahtar Kelimeler

Calcite, Media size, Stirred media mill

Kalsitin Yaş Öğütülmesinde Öğütücü Ortam Performansının Etkisi

Öz

Bu
çalışmada, kalsitin (CaCO₃, d₅₀=5,4 µm) yaş öğütülmesi üzerine
laboratuvar ölçekli bilyalı değirmende (750 ml) yüksek yoğunluğa sahip zirkon
(ZrO₂) bilya (0,2-1 mm) tasarımıyla sistematik bir çalışma
amaçlanmıştır. Farklı miktarda ince bilya (%25, %50 ve %75) ve farklı ince-iri
bilya oranları (0,2 ve 0,5) kullanılarak mikron-altı öğütme gerçekleştirilmiştir.
Ayrıca, öğütücü ortamın yüzey alanlarının (S_bw, m²/kg) öğütme performansına etkisi
araştırılmıştır. En iyi deney sonuçları karşılaştırıldığında (M1 ve M4),
karışık bilya boyut dağılımının (M4) yüzey alanı, tek tip bilya boyut
dağılımının (M1) yüzey alanından %75 daha fazladır. Deneysel sonuçlar ürün
boyutu (d₅₀, d₈₀), kümülatif elek altı eğrisi ve spesifik yüzey alanı (S_W,m²/g) dikkate alınarak değerlendirilmiştir. Sonuçlar, sadece ince
boyutlu öğütücü ortamın 600 devir/dk hızda çok fazla etkili olmadığını
gösteriyor.

Anahtar Kelimeler

Bilya boyutu, Kalsit, Karıştırmalı bilyalı değirmen

Kaynakça

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