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

Kwangsuk You

doi:10.7844/kirr.2020.29.6.73

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2020 Vol.29, Issue 6 Preview Page Next Page

Research Paper

Phase Transformation of Coal Tailing of Beneficiation with the Addition of Na₂CO₃ at High Temperature Na₂CO₃의 첨가에 따른 석탄 선탄 폐석의 소결 상변화 연구

31 December 2020. pp. 73-78

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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.%.

Keywords

coal gangue mineral

phase transformation

Na₂CO₃

glassification

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.

키워드

석탄 폐석

상변화

탄산나트륨

유리질화

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Information

Publisher :The Korean Institute of Resources Recycling
Publisher(Ko) :한국자원리싸이클링학회
Journal Title :Journal of the Korean Institute of Resources Recycling
Journal Title(Ko) :자원리싸이클링
Volume : 29
No :6
Pages :73-78
Received Date : 2020-11-11
Revised Date : 2020-12-08
Accepted Date : 2020-12-16
DOI :https://doi.org/10.7844/kirr.2020.29.6.73

Resources Recycling 자원리싸이클링 ISSN:2765-3439(Print) 2765-3447(Online)

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