Abstract
References
Information
A study on correlationship between the size of minerals and the degree of liberation for products from ball mill was carried out. The composition of skarn ore was determined through XRD analysis and a micro-focus X-ray computed tomography. The size of sulfides minerals in skarn ore was measured through digital microscopic. Comminution was carried out through compact a ball mill. Fractional degree of liberation (FDL) at various rotation speed was measured. FDL was derived from fraction of area measured by image analysis method. Furthermore, experimentally determined values for the degree of liberation was compared with those obtained from simulation result based on binary liberation model proposed by Park et al. (1991). The experimentally determined FDL was almost same as simulated values. The FDL was found to rapidly increase at the size of valuable mineral, α=59. The result from this study suggest that the size of valuable mineral is major factor which decide the degree of liberation.
스카른 Zn-Pb-Cu 복합광석에 있어서 유용광물의 입자의 크기와 분쇄산물의 단체분리도와의 상관성에 대한 연구를 실시하였다. XRD분석과 마이크로 포커스 X-ray 단층촬영을 통해 원광의 광물학적 조성을 분석하였으며, 전자 현미경을 통해 유용광물의 입자크기를 측정하였다. 소형 볼밀에 의해 분쇄실험을 진행하였으며 임계회전속도 분율에 따른 분쇄 산물의 FDL를 측정하였으며, 측정방법은 화상해석법에 의한 유용광물의 2차원 면적비로부터 구하였다. 측정된 단체분리도 결과는 Park et al.(1991)의 2성분계 단체분리 model에 기반을 둔 시뮬레이션 결과와 비교하였다. FDL에 대한 실험결과는 시뮬레이션 결과와 거의 일치하였으며 유용광물의 크기 α=59 ㎛ 부근에서 FDL이 급격히 증가함을 확인하였다. 이것으로부터 원광내의 유용광물의 크기가 단체분리도를 결정하는데 주요인자가 됨을 알 수 있었으며, 시뮬레이션과 화상해석을 통하여 분쇄입도를 결정할 수 있을 것으로 판단된다.
- 정미희, 조상호, 정수복, 김영훈, 박재구, 金子 勝比古, 2010, “3차원 X-ray 단층 화상을 이용한 스카른 광석의 정량분석 연구,” 한국광물학회, 제23권, 3호, pp. 211-217.
- Gay, S. L., 2004, “A liberation model for comminution based on probability theory,” Minerals Engineering, Vol. 17, No. 6, pp. 525-534.
- Ito, M., Tsunekawa, M., Yamaguchi, E., Sekimura, K., Kashiwaya, K., Hori, K. and Hiroyoshi, N., 2008, “Estimation of degree of liberation in a coarse crushed product of cobalt-rich ferromanganese crust/nodules and its gravity sepaation,” International Journal of Mineral Processing, Vol. 87, No. 5, pp. 100-105.
- Itoh, H., 2007, Advanced grinding technology and applications, The Association of Power Process Industry and Engineering, JAPAN.
- King, R.P. and Schneider, C. L., 1998, “Stereological correction of linear grade distributions for mineral liberation,” Powder Technology, Vol. 98, No. 4, pp. 21-37.
- Lane, G. R., Martin, C. and Pirard, E., 2008, “Techniques and applications for predictive metallurgy and ore characterization using optical image analysis,” Minerals Engineering, Vol. 21, No. 7, pp. 568-577.
- Moad, A. M., 1940, “The theory of Runs,” Annals of Mathematical Statistics, Vol. 11, No. 4, pp. 367-392.
- Park, J. K., Okano, Y. and Inoue, T., 1991, “Estimation of Grain Size Distribution of Constituent Mineral by Comminution-Liberation Model,” Journal of the mining and materials processing institute of Japan, Vol. 107, No. 11, pp. 801-804.
- Pirard, E., 2004, “Multispectral imaging of ore minerals in optical microscopy,” Mineralogical Magazine, Vol. 68, No. 2, pp. 323-333.
- Schnatz, R., 2004, “Optimization of continuous ball mills used for finish-grinding of cement by vaying the L/D ratio, ball charge filling ratio, ball size and residence time,” International Journal of Mineral Processing, Vol. 74, No. 7, pp. s55-s63.
- Underwood, Ervin E., 1970, Quantitative Stereology, Addison- Wesley Pub. Co., UK.
- Wills, B. A., 2006, Will's Mineral Processing Technology, Seventh Edition, Elsevier, Oxford, UK.
- Publisher :The Korean Society of Mineral and Energy Resources Engineers
- Publisher(Ko) :한국자원공학회
- Journal Title :Journal of the Korean Society for Geosystem Engineering
- Journal Title(Ko) :한국지구시스템공학회지
- Volume : 48
- No :1
- Pages :52-58
Journal of the Korean Society of Mineral and Energy Resources Engineers
