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ABSTRACT
The vitrinite-rich concentrates were produced from five coking coals with different ranks (Donghuantuo gas coal, Tangshan 1/3 coking coal, Zhongliu fat coal, Hongsheng coking coal, and Lvjiatuo coking coal) by float-sink separation under centrifugal force. The relationships of the pyrolysis characteristics of raw coals (RC) and vitrinite-rich concentrates (VC) with the coal rank and elemental composition were studied by thermogravimetric analysis and ultimate analysis. The results show that vitrinite-rich concentrate have greater weight loss and a higher weight-loss rate than the corresponding raw coals. Also, VCs have higher H, C, and N content and lower O and S content. With an increase of coal rank, the weight-loss rate (ΔTG) and maximum weight-loss rate (DTGmax) of VC decreases, and the temperature with DTGmax (Tmax) of VC increases, and the C/H ratio of VC also increases. The analysis of thermogravimetric parameters and elemental composition of VC shows that the ΔTG and DTGmax decrease linearly with the C/H ratio, and Tmax increases linearly with the C/H ratio.
Funding
We are grateful for joint funding by the National Natural Science Foundation of China and the Shenhua Group Corporation Limited (No. U1361212).