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http://dx.doi.org/10.7844/kirr.2020.29.6.73

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

YOU, Kwangsuk (Korea Institute of Geoscience and Mineral Resources, Department of Mineral Resource)
Publication Information
Resources Recycling / v.29, no.6, 2020 , pp. 73-78 More about this Journal
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; $Na_2CO_3$; glassification;
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