자원환경지질 (Economic and Environmental Geology)

  • 제55권5호
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  • Pages.429-438
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  • 2022
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  • 1225-7281(pISSN)
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  • 2288-7962(eISSN)
대한자원환경지질학회 (The Korean Society of Economic and Environmental Geology)
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화강암 파쇄시 풍화정도가 골재 입도분포 및 미석분 발생에 미치는 영향

Effect of the Degree of Weathering on the Distribution of Aggregate Particle Size and the Generation of Fine Rock Particles during Crushing of Granite

  • You, Byoung-Woon (Department of Astronomy, Space Science and Geology, Chungnam National University) ;
  • Lee, Jin-Young (Korea Institute of Geoscience and Mineral Resources) ;
  • Lee, Dong-kil (Korea Institute of Geoscience and Mineral Resources) ;
  • Cheong, Young-Wook (Korea Institute of Geoscience and Mineral Resources)
  • 투고 : 2022.09.02
  • 심사 : 2022.09.18
  • 발행 : 2022.10.28
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초록

본 연구는 골재 생산과정에서 화감암 파쇄시 풍화정도가 골재의 입도분포 및 미석분 발생량에 미치는 영향을 평가하였다. 경북 거창의 골재 채석장에서 슈미스 햄머 측정값으로 강도 차가 있는 3개 지역에서 암석 시료를 채취하였다. 실내에서 동일 조건에서 죠크러셔로 파쇄를 한 후 입도분석, 광물 분석, 화학분석과 풍화지수를 산출했다. 슈미트 햄머 측정값은 56, 28, <10로 나타났고 풍화지수인 CIA 및 CIW 값도 차이가 나타나 시료들을 풍화도에 따라서 경암, 연암 및 풍화암으로 구분했다. 경하에서 풍화암으로 갈수록 작은 입도분포를 보이며, 변질광물로 견운모와 같은 점토광물의 비율이 높아졌다. 경암은 장석 및 석영 비율이 높았고 백운모 및 고령석(kaolinite)의 비가 작았다. 죠크러셔 파쇄 결과 경암은 굵은 파쇄물(13.2mm)을 많이 생산한 반면 풍화가 진행된 연암 및 풍화암은 가는 파쇄물(4.75mm)을 생산했다. 전자는 베타분포 곡선 특징을 보였고 후자는 쌍봉 분포 곡선을 보였다. 미석분(0.71mm 체 이하; 중량 %) 발생은 경암, 연암, 풍화암에서 13%<21%<22%로 증가하여 풍화도가 클수록 미석분이 많이 발생했다. 미석분은 습식 골재 생산 공정에서 샌드 유닛(모래탈수장치)의 운전으로 회수된다. 따라서 골재생산 공정에서 슬러지 발생량을 최소화하기 위해 사이클론의 최적 운전에 대한 연구가 필요할 것으로 판단되었다.

This study evaluated the effect of the degree of weathering on the particle size distribution and the amount of fine particles generated in the aggregate production process during the crushing of igneous rock. Rock samples were collected from three areas with differences in strength from the Schmith hammer measurement at the aggregate quarry in Geochang, Gyeongsangbuk-do. After crushing with a jaw crusher under the same conditions in laboratory, particle size analysis, mineral analysis, chemical analysis, and weathering index were calculated. The Schmidt hammer measurements were 56, 28, and <10, and the CIA and CIW values of weathering index were also different, so the rock samples were classified into hard rock, soft rock, and weathered rock according to the weathering degree. It shows a smaller particle size distribution toward weathered rocks under the microscope, and the proportion of altered clay minerals such as sericite increased. The composition of feldspar and quartz was high for hard rock, and the ratio of muscovite and kaolinite was low. As a result of the crushing of the jaw crusher, hard rock produced a lot of coarse crushed material (13.2mm), while soft rock and weathered rock produced fine crushed material (4.75mm). The former showed the characteristics of the beta distribution curve, and the latter showed the bimodal distribution curve. The production of fine rock particles (based on 0.71mm of sieve, wt. %) increased to 13%<21%<22% in hard rock, soft rock, and weathered rock, and the greater the degree of weathering, the more fine rock particles were generated. The fine particles are recovered by the operation of the sand unit in the wet aggregate production process. Therefore, in order to minimize the amount of sludge generated in the aggregate production process, it was judged that a study on the optimal operation of cyclones could be necessary.

키워드

과제정보

본 연구는 한국지질자원연구원에서 수행하고 있는 '2022 골재자원 조사 및 관리(22-5207)'의 지원으로 수행되었습니다. 현장 방문과 자료 지원을 해준 T, K, J, A 등 골재생산업체 관계자께 감사의 뜻을 밝힙니다.

참고문헌

  1. Ban, J.D., Moon, S.W., Lee, S.W., Lee, J.G. and Seo, Y.S. (2017) Physical and chemical weathering indices for biotite granite and granitic weathered soil in Gyeongju. The Journal of Engineering Geology, v.27, n.4, p.451-462. doi: 10.9720/kseg.2017.4.451
  2. Choi, E.K., Kim, S.W., Kim, I.S. and Lee, K.H. (2012) A Study on the Chemical Index of Alteration of Igneous Rocks. Journal of the Korean GEO-Environmental Society, v.28, n.5, p.41-54. doi: 10.7843/kgs.2012.28.5.41
  3. Chungcheong review (2019) www.ccreview.co.kr/news/articleView.html?idxno=205874, (2021.9.9.)
  4. Chung H.S. and You, B.O. (1997) A study on variation of rock strength due to weathering and it's estimation. Journal of the Korean GEO-Environmental Society, v.13, n.6, p.71-93 (in Korean).
  5. Elsayed K. and Lacor, C. (2011) The effect of cyclone inlet dimensions on the flow pattern and performance. Applied Mathematical Modelling, v.35, n.4 p.1952-1968. doi: 10.1016/j.apm.2010.11.007
  6. Han, M., Kim, S.W., Yang, K.H. and Kim, J.S. (2010). Petrological Study of the Dioritic and Granitic Rocks from Geochang Area. Jour. Petrol. Soc. Korea, v.19, n.3, p.167-180 (in Korean with English abstract).
  7. Harzanagh, A.A., Orhan, E.C. and Ergum, S.L. (2018) Discrete element modelling of vibrating screens. Minerals Engineering, v.121, p.107-121. doi: 10.1016/j.mineng.2018.03.010
  8. Hoekstra, A.J., Derksen, J.J. and Akker V.D. (1999) An experimental and numerical study of turbulent swirling flow in gas cyclones. Chemical Engineering Science, v.54, p.2055-2065. doi: 10.1016/S0009-2509(98)00373-X
  9. Hu, L.Y., Zhou, L.X., Zhang, J. and Shi, M.X. (2005) Studies on strongly swirling flows in the full space of a volute cyclone separator. AIChE Journal, v.51, p.740-749. doi: 10.1002/aic.10354
  10. Jwa, Y.J., Choi, J.B., Kim, K.K. and Hwang, G.C. (2007) Quality Standard of the Geochang Granite Stone. Jour. Petrol. Soc. Korea, v.16, n.1, p.38-45 (in Korean).
  11. Khayat, K.H. and Assaad, J.J. (2004) Comparison of field-oriented test methods to assess dynamic stability of self consolidating concrete. ACI Materials Journal, v.101, n.2, p.168-176.
  12. Kanishk, B., Gauti, A., Paul, B., Aubrey, M., Elibariki, A., Jisenha, P., Nkanyiso, Z., Anthony, A., Erik, H. and Magnus, E. (2021) Simulation-driven development for coarse comminution process - a case study of geita gold mine, tanzania using plantsmith process simulator. International Conference on Engineering Design, ICED21, p.2681-2690. doi: 10.1017/pds.2021.529
  13. Khanlari, G.R., Heidari, M. and Momeni, A.A. (2012) Assessment of weathering processes effect on engineering properties of Alvand granitic rocks (west of Iran), based on weathering indices. Environmental Earth Sciences, v.67, n.3, p.713-725. doi: 10.1007/s12665-011-1518-6
  14. Kim, Y.J., Cho, D.L. and Park, Y.S. (1989) K-Ar Ages and Major Mineral Compositions of the Mesozoic Igneous Rocks in the Vicinity of the Geochang Area. Jour. Korean Inst. Mining Geol., v.22, n.2, p.117-127 (in Korean with English abstract).
  15. Lee, W.B. and Khumawala, B.M. (1974) Simulation testing of aggregate production planning models in an implementation methodology. Management Science, v.20, n.6, p.903. doi: 10.1287/mnsc.20.6.903
  16. Lee, K.H., Kim, Y.J., Hwang, T.J. and Cho, J.Y. (2011) Gradation curve of coarse aggregate by digital image analysis. LHI Journal, v.2, n.1, p.69-78 (in Korean ). doi: 10.5804/LHIJ.2011.2.1.069
  17. Park, C.G. (2020) The Current State and Application of CrushedStone Sludge. MRCR, v.15, p.66-72. doi: 10.14190/MRCR.2020.15.3.066
  18. Pendent, 10-1186507, Hydrocyclone for controling length of vortex finder, apparatus and method for separating aggregate of dredge deposit soil using thereo.
  19. Sisapress (2021) www.sisajournal.com/news/articleView.html?idxno=139522 (2021.9.16.)
  20. Solero, G. and Coghe, A. (2002) Experimental fluid dynamic characterization of a cyclone chamber. Experimental Thermal and Fluid Science, v.27, p.87-96. doi: 10.1016/S0894-1777(02)00221-2
  21. Song, H.Y., Lee, S.S., Lee, J.H. and Lee, Y.S. (2009) A study on the quality properties of recycled sand by produced dry manufacturing system and wet manufacturing system. Journal of the Korea Recycled Construction Resources Institute, p.74-81.
  22. Yersel, E., Batar, T., Tufan, B. and Erdogan, N. (2014) Designing of aggregate plant flowsheet by simulation method. Proceedings of 14th International Mineral Processing Symposium - Kusadasi, Turkey, p.17-21.
  23. Yazdabadi, P.A., Grifflths, A.J. and Syred, N. (1994) Characterization of the pvc phenomena in the exhaust of a cyclone dust separator. Experiments in Fluids, v.17, p.84-95. doi: 10.1007/BF02412807