Spectroscopy and Spectral Analysis, Volume. 42, Issue 6, 1979(2022)
XRD Structural Analysis of Raw Material Used as Coal-Based Needle Coke in the Coking Process
Figures & Tables(6)
Fig. 1. XRD patterns of the SCTP and the samples obtained at heat-treatment temperatures up to 1 400 ℃
Fig. 2. The fitting results of XRD patterns for the SCTP and the samples processed at heat-treatment temperatures up to 1 400 ℃ (a, b, c) and the peak-fitting results of SCTP-1 400 ℃ (d)
Table 1. Basic properties of raw material SCTP
View tableView in ArticleTable 1. Basic properties of raw material SCTP
Sample SPa
/℃TSb
/%TI-QSc
/%QId
/%CVe
/%Ashf
/%SCTP 33 88.17 11.09 0.74 37.3 0.09
Table 2. Parameter symbols and meanings obtained by CarbX software
View tableView in ArticleTable 2. Parameter symbols and meanings obtained by CarbX software
Parameter Meaning Illustration Intralayerstructure La/Å Average graphene layer size 
/Å Average chord length 
ka Polydispersity of chord lengthl kr Polydispersity of the radius of the layers lcc/Å Average C—C bond length 
σ1 Standard deviation of the first-neighbor distribution Interlayerstructure Lc/Å Average stack size 
kc Polydispersity of Lc a3/Å Average interlayer spacing 
σ3 Standard deviation of interlayer spacing a3min/Å Minimum of interlayer spacing Δa3 Difference between a3 and a3 min N Average number of graphene layers per stack ε3 Disorder of graphene layers u3 Parameterof thermal motion η Homogeneity of the stacks 
q Parameterof preferred orientation 
Impurities cun Concentration of unorganized carbon 
cN Concentration of unorganized nitrogen cO Concentration of unorganized oxygen
Table 3. Microcrystalline structural parameters obtained by three methods
View tableView in ArticleTable 3. Microcrystalline structural parameters obtained by three methods
Parameter Bragg-Scherrer
methodPeak-fitting
methodCarbX
methodLa/Å 39.1 45.9 41.5 Lc/Å 16.2 22.2 16.6 d002/Å 3.45 3.47 3.41 N 5.69 7.4 4.88
Table 4. Microcrystalline structural parameters of the samples obtained by CarbX fitting
View tableView in ArticleTable 4. Microcrystalline structural parameters of the samples obtained by CarbX fitting
Parameter 20 ℃ 400 ℃ 500 ℃ 600 ℃ 800 ℃ 1 000 ℃ 1 200 ℃ 1 400 ℃ Intralayer
structureLa/Å 10.3 12.6 14.5 13.8 15.7 21.3 30.4 47.9 <l>/Å 6.9 8.4 9.7 9.2 11.8 17.1 24.3 38.3 ka 0.5 0.5 0.5 0.5 0.33 0.25 0.25 0.25 kr 0.39 0.39 0.39 0.39 0.23 0.16 0.16 0.16 lcc/Å 1.414 1.416 1.413 1.414 1.412 1.413 1.414 1.415 σ1 0.24 0.25 0.23 0.20 0.21 0.17 0.15 0.15 Interlayer
structureLc/Å 9.4 13.7 31.1 18.4 16.9 15.4 16.7 17.3 kc 0.22 0.46 0.47 0.99 0.90 0.22 0.33 0.32 a3/Å 3.52 3.50 3.44 3.42 3.41 3.39 3.42 3.41 σ3 0.31 0.32 0.29 0.23 0.31 0.32 0.28 0.29 a3 min/Å 3.00 3.00 3.00 3.00 3.00 3.00 3.00 3.00 Δa3/Å 0.52 0.50 0.44 0.42 0.41 0.39 0.42 0.41 N 2.66 3.91 9.05 5.39 4.96 4.55 4.87 5.06 ε3 0.17 0.17 0.15 0.14 0.14 0.13 0.14 0.14 u3 0 0 0 0 0 0 0 0 η 0.73 0.70 0.63 0.81 0.91 0.95 0.95 0.95 q 0.03 0.04 0.10 0.04 0.17 0.12 0.21 0.23 Impurities cun 0.15 0.18 0.17 0.12 0.16 0.32 0.34 0.31 cO 0 0 0 0 0 0 0 0 cN 0 0 0 0 0 0 0 0
Tools
Get Citation
Copy Citation Text
Qing-jie FAN, Yan SONG, Shi-quan LAI, Li YUE, Ya-ming ZHU, Xue-fei ZHAO. XRD Structural Analysis of Raw Material Used as Coal-Based Needle Coke in the Coking Process[J]. Spectroscopy and Spectral Analysis, 2022, 42(6): 1979
Paper Information
Category: Research Articles
Received: May. 4, 2021
Accepted: --
Published Online: Nov. 14, 2022
The Author Email: FAN Qing-jie (1797395056@qq.com)
© Copyright 2018-2021 | Chinese Laser Press.
All Rights Reserved 沪ICP备15018463号-20