ժҪ Four types of coals, KL, XB, ZS and GD with different coal ranks, were dissolved with the organic solvent N-methyl-2-pyrrolidone at 350 ��C and around 3.0 MPa pressure to obtain thermal soluble constituents (TSCs). The yield, component and maceral group were investigated as well as their coking properties, including caking index and thermoplasticity. The results indicated that the yields of the four coals were of the following order: KL > XB > ZS > GD. Based on the yield and the vitrinite content, coals were ranked from high to low. The ash contents of TSCs were significantly less than that of raw coals, and the TSCs contain more light components, leading to an increase in volatile matter. The patterns of Fourier transform infrared spectroscopy indicated that carbonyl was enriched in TSCs. Regarding the maceral group, TSCs were mainly composed of vitrinite which is the main reactive material and converts into binder phase in cokemaking process. Higher caking index values and fluidity were obtained in TSCs compared with the raw coals. The coking experiments with different amounts of TSCs addition were carried out. The results demonstrated that the proper TSCs addition could enhance the coke strength due to its high caking index and good fluidity.
Abstract��Four types of coals, KL, XB, ZS and GD with different coal ranks, were dissolved with the organic solvent N-methyl-2-pyrrolidone at 350 ��C and around 3.0 MPa pressure to obtain thermal soluble constituents (TSCs). The yield, component and maceral group were investigated as well as their coking properties, including caking index and thermoplasticity. The results indicated that the yields of the four coals were of the following order: KL > XB > ZS > GD. Based on the yield and the vitrinite content, coals were ranked from high to low. The ash contents of TSCs were significantly less than that of raw coals, and the TSCs contain more light components, leading to an increase in volatile matter. The patterns of Fourier transform infrared spectroscopy indicated that carbonyl was enriched in TSCs. Regarding the maceral group, TSCs were mainly composed of vitrinite which is the main reactive material and converts into binder phase in cokemaking process. Higher caking index values and fluidity were obtained in TSCs compared with the raw coals. The coking experiments with different amounts of TSCs addition were carried out. The results demonstrated that the proper TSCs addition could enhance the coke strength due to its high caking index and good fluidity.
Hai-bin Zuo ? Si-yang Long ? Jing-song Wang ? Wen-tao Guo. Coking properties of thermal soluble constituents of coals by N-methyl-2-pyrrolidone solvent[J].Journal of Iron and Steel Research International, 2018, 25(4): 378-386.
Hai-bin Zuo ? Si-yang Long ? Jing-song Wang ? Wen-tao Guo. Coking properties of thermal soluble constituents of coals by N-methyl-2-pyrrolidone solvent. , 2018, 25(4): 378-386.
H. Shui, W. Zhao, C. Shan, et al, Caking and coking properties of the thermal dissolution soluble fraction of a fat coal, Fuel Processing Technology. 118(2014) 64-68.
[2]
M. Stefanova, B. R. T. Simoneit, G. Stojanova, et al, Composition of the extract from a carboniferous bituminous coal: 1. Bulk and molecular constitution, Fuel. 74(1995) 768-778.
[3]
T. Yoshida, T. Takanohashi, K. Sakanishi, et al, The effect of extraction condition on ��HyperCoal��production (1)��under room-temperature filtration, Fuel. 81(2002) 1463-1469.
[4]
T. Yoshida, C. Li, T. Takanohashi, et al, Effect of extraction condition on "HyperCoal" production (2) - Effect of polar solvents under hot filtration, Fuel Processing Technology. 86(2004) 61-72.
[5]
M. Rahman, A. Samanta, R. Gupta, Production and characterization of ash-free coal from low-rank Canadian coal by solvent extraction, Fuel processing technology. 115(2013) 88-98.
[6]
H. Shui, Effect of coal extracted with NMP on its aggregation, Fuel. 84(2005) 939-941.
[7]
T. Takanohashi, T. Shishido, I. Saito, Effects of HyperCoal addition on coke strength and thermoplasticity of coal blends, Energy & Fuels. 22(2008) 1779-1783.
[8]
T. Takanohashi, T. Shishido, H. Kawashima, et al, Characterisation of HyperCoals from coals of various ranks, Fuel. 87(2008) 592-598.
[9]
K. Koyano, K. Ueoka, T. Takanohashi, et al, Addition effect of model compounds of coal extract on coke strength, ISIJ international. 51(2011) 1044-1049.
[10]
H. Shui, H. Li, H. Chang, et al, Modification of sub-bituminous coal by steam treatment: Caking and coking properties, Fuel processing technology. 92(2011) 2299-2304.
[11]
Y. Dohi, K. Fukada, T. Yamamoto, et al, A novel measurement method for coal thermoplasticity: permeation distance, ISIJ International. 54(2014) 2484-2492.
[12]
Y. Yamazaki, H. Hayashizaki, K. Ueoka, et al, The effect of variation of the coke microstructure with addition of iron ore on the tensile strength of ferrous coke, Tetsu-to-Hagane. 96(2010) 536-544.
[13]
M.Iino, T. Takanohashi, H. Ohsuga, et al, Extraction of coals with CS 2 -N-methyl-2-pyrrolidinone mixed solvent at room temperature: Effect of coal rank and synergism of the mixed solvent, Fuel. 67(1988) 1639-1647.
[14]
W. Li, X. Bai, J. Yang, et al, Correspondence between mean maximum reflectance of vitrinite and classification of bituminous coal, Journal of China Coal Society. 31(2006) 343-345.
[15]
Z. Qin, Z. Zong, J Liu, H. Ma, et al, Solubilities of lithotypes in carbon disulfide-N-methyl-2-pyrrolidinone mixed solvent, Journal of Fuel Chemistry & Technology. 25(1997) 549-553.
[16]
N. Okuyama, N. Komatsu, T. Shigehisa, et al, Hyper-coal process to produce the ash-free coal, Fuel Processing Technology. 85(2004) 947-967.
[17]
H. Petersen, P. Rosenberg, H. Nytoft, Oxygen groups in coals and alginite-rich kerogen revisited, International Journal of Coal Geology. 74(2008) 93-113.
[18]
Z. Niu, G. Liu, Y. Hao, et al, Investigation of mechanism and kinetics of non-isothermal low temperature pyrolysis of perhydrous bituminous coal by in-situ FTIR, Fuel. 172(2016) 1-10.
[19]
Ge L, Zhang Y, Wang Z, et al, Effects of microwave irradiation treatment on physicochemical characteristics of Chinese low-rank coals, Energy Conversion and Management. 71(2013) 84-91.
[20]
A. Chen, S. Zhou, Stuady on the relationship between maceral of coal and optical texture of its coke, Coal Chemical Industry. 73(1995) 38-48.
[21]
S. Pusz, B. Kwieci��ska, A. Koszorek, et al, Relationships between the optical reflectance of coal blends and the microscopic characteristics of their cokes, International Journal of Coal Geology. 77(2009) 356-362.
[22]
S. Zhou, J. Zhao, Properties of coking coal and quality of coke for the blast furnace, Metallurgical industry Press, Beijing, 2008.
2018, Vol. 25 
