Effect of Bimodal and Monosized Grinding Media on Dry Grinding of Barite

Öz

This study investigates the effects of the design of high-density zircon (ZrO2) grinding media (1-3 mm) on dry grinding of barite (BaSO4, d50= 2.83 µm) in a vertical stirred media mill. Grinding experiments were carried out by using different proportions of finer grinding media (20 wt.%, 40 wt.% and 80 wt.%) and different size ratio of finer-coarser media (0.5 and 0.67). Besides, the surface areas (Sbw, m2/kg) of grinding media on grinding performance were investigated. If the best two experimental results are compared, it is found that the Sbw of the bimodal and monosized media are very close together. The experimental results were evaluated based on the product particle size (d50, d90), and the geometric standard deviation of barite particles (d84/d16). The findings showed that the finer grinding media alone was not very effective.

Anahtar Kelimeler

• Vertical stirred media mill,Dry grinding,Media size,Barite

Baritin Kuru Öğütülmesinde Karışık ve Tek Tip Öğütücü Ortamın Etkisi

Öz

Bu çalışma dikey karıştırmalı bilyalı değirmende baritin (BaSO4, d50= 2,83 µm) kuru öğütülmesinde yüksek yoğunluğa sahip zirkon (ZrO2) (1-3 mm) öğütme ortamı tasarımının etkisini araştırmaktadır. Farklı miktarda ince bilya (%20, %40 ve %80) ve farklı ince-iri bilya oranları (0,5 ve 0,67) kullanılarak mikron-altı öğütme gerçekleştirilmiştir. Ayrıca, öğütücü ortamın yüzey alanlarının (Sbw, m2/kg) öğütme performansına etkisi araştırılmıştır. En iyi deney sonuçları karşılaştırıldığında, karışık bilya boyut dağılımının yüzey alanı ile tek tip bilya boyut dağılımının yüzey alanı birbirine çok yakındır. Deneysel sonuçlar ürün boyutu (d50, d90) ve barit tanelerinin geometrik standart sapması (d84/d16) dikkate alınarak değerlendirilmiştir. Sonuçlar, tek başına ince boyutlu öğütücü ortamın çok fazla etkili olmadığını gösteriyor. 

Anahtar Kelimeler

• Dikey karıştırmalı bilyalı değirmen,Kuru öğütme,Bilya boyutu,Barit

Kaynakça

1. 1. Mankosa, M.J., Adel, G.T. and Yoon, R.H., 1989. Effect of Operating Parameters in Stirred Ball Mill Grinding of Coal, Powder Technology., 59(4), 255–260.
2. 2. Kwade, A., Blecher, L., Schwedes, J., 1996. Motion and Stress Intensity of Grinding Beads in a Stirred Media Mill: Part II. Stress Intensity and its Effect on Comminution, Powder Technology, 86, 69-76.
3. 3. Patel, C.M., Chakraborty, M., Murthy, Z.V.P., 2014. Enhancement of Stirred Media Mill Performance by a New Mixed Media Grinding Strategy, Journal of Industrial and Engineering Chemistry, 20, 2111-2118.
4. 4. Bel Fadhel, H., Frances, C., 2001. Wet Batch Grinding of Alumina Hydrate in a Stirred Bead Mill, Powder Technology, 119(2–3), 257–268.
5. 5. Wang, Y., Forssberg, E., 2007. Enhancement of Energy Efficiency for Mechanical Production of Fine and Ultra Fine Particles in Comminution, China Particuology, 5, 193–201. 6. Kwade, A., Schwedes, J., 2002. Breaking Characteristics of Different Materials and their Effect on Stress Intensity and Stress Number in Stirred Media Mills, Powder Technology, 122, 109-121.
6. 7. Zheng, J., Harris, C.C., Somasundaran, P., 1997. The Effect of Additives on Stirred Media Milling of Limestone, Powder Technology, 91 (3), 173–179.
7. 8. Jankovic, A. and Sinclair, S., 2006. The Shape of Product Size Distributions in Stirred Mills, Minerals Engineering, 19, 1528-1536.
8. 9. Mankosa, M.J., Adel, G.T., Yoon, R.H., 1986. Effect of Media Size in Stirred Ball Mill Grinding of Coal, Powder Technology, 4, 75-82.

9. 10. Tüzün, M.A., 1994. A Study of Comminution in a Vertical Stirred Ball Mill, Ph.D. Dissertation, Chemical Eng. Dep., University of Natal.
10. 11. Zheng, J., Harris, C.C., Somasundaran, P., 1996. A Study on Grinding and Energy Input in Stirred Media Mills, Powder Technology, 86(2), 171–178.
11. 12. Wang, Y., Forssberg, E., Sachweh, J., 2004. Dry Fine Comminution in a Stirred Media Mill - MaxxMill, Int. J. Mineral Process., 74, 65-74.
12. 13. Wang, Y., Forssberg, E., 2000. Product Size Distribution in Stirred Media Mills, Minerals Engineering, 13(4), 459-465.
13. 14. Jankovic, A., 2003. Variables Affecting the Fine Grinding of Minerals Using Stirred Mills, Minerals Engineering, 16(4), 337–345.
14. 15. Mende, S., Stenger, F., Peukert, W., Schwedes, J., 2004. Production of Sub Micron Particles by Wet Comminution in Stirred Media Mills, Journal of Materials Science, 39, 5223–5226.
15. 16. Hickey, A., Giovagnoli, S., 2018. Pharmaceutical Powder and Particles, Edited by Springer, ISBN 978- 3-319-91219-6.
16. 17. Kotake, N., Matsumoto, K., Sekine, Y., Gunjı, S., Kezuka, H., 2014. Effect of Poly-sized and Mono-sized Grinding Media on Fine Grinding of Limestone in a Bead Mill, International Journal of the Society of Materials Engineering for Resources, 20, 147-153.