Resources Recycling (자원리싸이클링)

The Korean Institute of Resources Recycling (한국자원리싸이클링학회)
권호 표지
DOI QR코드

DOI QR Code

Phase Transformation of Coal Tailing of Beneficiation with the Addition of Na2CO3 at High Temperature

Na2CO3의 첨가에 따른 석탄 선탄 폐석의 소결 상변화 연구

  • YOU, Kwangsuk (Korea Institute of Geoscience and Mineral Resources, Department of Mineral Resource)
  • 유광석 (한국지질자원연구원 DMR융합연구단)
  • Received : 2020.11.11
  • Accepted : 2020.12.16
  • Published : 2020.12.30
Download PDF
⟨ Previous Next ⟩

Abstract

To use a tailing obtained from coal beneficiation as a raw material for glass material, the behaviors of phase transformation of the tailing was investigated according to sintered temperature with the addition of Na2CO3. As a result of the experiment, mullite was formed at 700~1,100 ℃, and the mullite and the cristobalite just only existed at 1,450 ℃. The glassification ratio of the coal tailing was to be 97.9 wt.% at 1,450 ℃ with the addition of Na2CO3 to tailing weight ratios of 10 wt.%. However, in the case of sample of coal tailing with 20 wt.% Na2CO3 added, nepheline(Na2O·Al2O3·2SiO2) was produced during the re-sintering(2nd sintering) at 1,100 ℃. From the results, the suitable addition amount of Na2CO3 for glassification of coal tailing was found around 10 wt.%.

선탄 폐석의 유리 소재 원료로의 활용을 위해 선탄 폐석의 고온 상 전위 거동 및 Na2CO3의 첨가에 따른 유리질(비정질)화 실험을 실시하였다. 실험 결과 700~1,100 ℃에서 소성된 선탄폐석에는 mullite가 생성되고, 1,450 ℃에서는 mullite와 cristobalite만이 존재하였다. 선탄 폐석의 유리질화는 Na2CO3 첨가됨에 따라 진행되었으며, Na2CO3 10 wt.% 첨가 후 1,450 ℃ 온도에서 소성된 선탄 폐석의 유리질화는 97.9 wt.%로 나타났다. 그러나 Na2CO3가 20 wt.% 첨가된 선탄 폐석의 시료의 경우, 1,100 ℃에서의 2차 재소성 과정에서 nepheline(Na2O·Al2O3·2SiO2)이 생성되었으며, 이를 통해 선탄폐석의 유리질화를 위한 최적의 Na2CO3 첨가량은 10 wt.%로 나타났다.

Keywords

References

  1. http://news.kmib.co.kr/article/view.asp?arcid=0923702824&code=11131413& (accessed Nov. 2017).
  2. Weiqing Zhang, Chaowei Dong, Peng Huang, et al., 2020 : Experimental study on the characteristics of activated coal gangue and coal gangue-based geopolymer, Energies, 13(10), 2504; https://doi.org/10.3390/en13102504.
  3. A.P. Claude, 2000 : Cements of yesterday and today: concrete of tomorrow, Cement and Concrete Research, 30(9), pp. 1349-1359. https://doi.org/10.1016/S0008-8846(00)00365-3
  4. Haibin Liu, Zhenling Liu, 2010 : Recycling utilization patterns of coal mining waste in china, Resources Conservation and Recycling, 54(12), pp.1331-1340 https://doi.org/10.1016/j.resconrec.2010.05.005
  5. Ling Qina and Xiaojian Gaoab, 2019 : Properties of coal gangue-Portland cement mixture with carbonation, FUEL, 245, pp.1-12. https://doi.org/10.1016/j.fuel.2019.02.067
  6. Zhou Shuang-xia, 2009 : Study on the reaction degree of calcined coal gangue powder in blended cement by selective solution method, Procedia Earth and Planetary Science, 1(1), pp.634-639. https://doi.org/10.1016/j.proeps.2009.09.100
  7. Yuanlan Zhang, Tung-Chai Ling, 2020 : Reactivity activation of waste coal gangue and its impact on the properties of cement-based materials - A review, Construction and Building Materials, 234, p.117424 https://doi.org/10.1016/j.conbuildmat.2019.117424.
  8. Liang Shen, Wenbao Lv, Wei Zhou, et al., 2017 : Recycling coal from coal gangue, Filtration and Separation, 54(3), pp.40-41 https://doi.org/10.1016/S0015-1882(17)30135-0
  9. Yanxia Guo, Yaoyao Li, Fangqin Cheng, et al., 2013 : Role of additives in improved thermal activation of coal fly ash for alumina extraction, Fuel Process. Technol., 110, pp.114-121. https://doi.org/10.1016/j.fuproc.2012.12.003
  10. I. Garcia-Lodeiro, A. Fernandez-Jimenez, P. Pena, et al., 2014 : Alkaline activation of synthetic aluminosilicate glass, Ceramic International, 40, pp.5547-5558. https://doi.org/10.1016/j.ceramint.2013.10.146