• Resources Recycling
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• v.29 no.6
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• pp.73-78
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• 2020

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.%.

• Resources Recycling
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• v.17 no.4
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• pp.47-56
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• 2008

The aim of this study is to produce cokes which can be used for the production of ferroalloy, for this purpose, domestic anthracite mixed with plastic was sintered at various condition. The combustion and physical properties of anthracite and plastic, coal separation, and the influence of factors on the strength of coke were investigated. The results of this study are as follows: 1. The three kinds of anthracite from the Samcheok region contained 25 to 30% ash of $100{\mu}m$ over size, and have the caloric value of 5,205 cal/g(TaeAn), 4,893 cal/g(JangSung), 4,873cal/g(KyongDong). 2. The recommendable conditions for heavy-fluid separation of the Samcheok coal are to set the specific gravity of heavy fluid to 2.4 and control the size of coal to $35{\sim}140mesh$. 3. It is concluded that phenolic resin powder, liquefied phenolic resin, SAN, and melamine resin can be used as a binder for the anthracite cokes, from the thermal analysis of various plastics. Especially, the liquefied phenolic resin was considered as the most suitable binder as it would simplify the process.

• Proceedings of the KAIS Fall Conference
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• 2009.12a
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• pp.259-262
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• 2009

본 연구에서는 석탄광산 선탄장설비와 국소배기시스템의 일부를 모형화하여 포집특성과 유동특성실험을 수행하였으며 동일조건에서 수치해석을 수행하여 그 결과를 비교 검토하였다. case 5가 46.35%의 가장 높은 포집효율을 보였으며 실험의 3가지 변수 중 고무 커튼의 사용유무가 국소배기시스템의 포집효율에 가장 큰 영향을 미치는 것으로 판단된다. 또한 case 1, 5, 6에 대해 포집된 입자크기 확인 결과, 포집성능이 우수한 case 5가 입경 $20{\mu}m$ 초과 입자들이 약 55%로 가장 많이 포집된 것을 알 수 있었다. 따라서 제어거리는 0.5m 이상이 적절한 것으로 판단된다.

• Resources Recycling
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• v.5 no.2
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• pp.45-51
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• 1996

Domestic coal contains approximnlely 03 to 7 percentage of sulfur. When the suliur in coal is burned, exhaust gas , nay be thc causc of air pollution problcms as well as acid rain. Thc government dccideil lo strengthen the environmcnlal protection policy a1 the 270 ppm of SO, for the coal-Ered plants and to stari in Ian. 1, 1999. This study was carried out lo rcmove the stlfur and mineral mancrs in the samplw using wet msg~xiic separatol ant1 oil agglomeration apparatus. The rcsults for the wet magnetic separalion showed that the total sulfur removal from Kangnung coal sample was 60.8% with 82.6% combustible recovery. For the results of oil agglomeration testa, combustible recavety, ash nod sulfur rcmovcl horn Maro coal sample were 98.0, 70.9 and 95.7 percent, respectively.

• Journal of Korea Soil Environment Society
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• v.2 no.2
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• pp.61-72
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• 1997

This research aims to remove the heavy metals, nonbiodegradable COD(NBDCOD), and color using the coal waste. The experimental by heat treatment was performed to advance the adsorption capacity. The results are as follows ; i) The coal waste had the adsorption capacity of heavy metals and the rates were in the range of 20 to 30 percents. ii) The heat treatment was the optimum condition that the reaction time was 6 hours at $500^{\circ}C$, , iii) In the column experimen, non-treated coal waste removed the COD and color in the range of 20 to 60 percents. iv) Heat-treated coal waste showed higher removal rate of the color in biological effluent, and heavy metal and COD removal rates were changed by the filteration rates.