煤尘表面碳、氧基团随变质增加的演化规律及其对润湿性的影响

程卫民; 徐翠翠; 周刚

煤尘表面碳、氧基团随变质增加的演化规律及其对润湿性的影响

程卫民^{1, 2},
徐翠翠^2, ,,
周刚^{1, 2}

1.
山东科技大学矿山灾害预防控制省部共建国家重点实验室培育基地, 山东青岛 266590
2.
山东科技大学矿业与安全工程学院, 山东青岛 266590

基金项目:

国家自然科学基金 U1261205

国家自然科学基金 51474139

中国博士后科学基金面上项目 2015M570602

山东科技大学杰出青年科技人才支持计划 2014JQJH106

2014年度青岛市黄岛区科技项目 2014-1-30

国家安全生产监督管理总局安全生产重大事故防治关键技术科技项目 shandong-0083-2015AQ

详细信息

通讯作者:
徐翠翠, Tel: 0532-86057953, E-mail: xucuicui519@163.com

中图分类号: TD714.1
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- 被引次数: 0
出版历程
- 收稿日期: 2015-09-17
- 修回日期: 2015-11-23
- 网络出版日期: 2021-01-23
- 刊出日期: 2016-03-30

Evolution law of carbon and oxygen groups on coal surface with increasing metamorphic grade and its effect on wettability

CHENG Wei-min^{1, 2},
XU Cui-cui^{2
, ,},
ZHOU Gang^{1, 2}

1.
State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao 266590, China
2.
College of Mining and Safety Engineering, Shandong University of Science and Technology, Qingdao 266590, China

Funds:

National Natural Science Foundation of China U1261205

National Natural Science Foundation of China 51474139

China Postdoctoral Science Foundation 2015M570602

SDUST Research Fund 2014JQJH106

Qingdao City Huangdao District Technology Fund 2014-1-30

Key Technology Projects of Chinese State Administration of Work Safety for Preventing Major Safety Production Accidents shandong-0083-2015AQ

摘要

摘要: 为探究煤自身结构差异对润湿性造成的影响, 针对煤尘中碳、氧两大主要元素展开研究.通过NMR以及XPS实验分别获得六种不同变质程度煤尘表面碳(氧) 基团的分布特征, 利用距离分析得到碳(氧) 基团的演化规律, 发现随变质程度加深, 一种基团的增减会伴随着其他基团的变化, 是聚类变化的过程.碳基团中的芳烃碳(Ar-C, H) 与羧基碳(-COOH)、次甲基碳(CH₂)、醚基碳(Ar-O、R-O) 演化规律接近, 氧基团中的羟基氧(-OH) 和醚基氧(C-O-C) 的演化规律接近.利用因子分析研究碳、氧基团演化对润湿性的影响, 发现芳香基团(Ar-C, H) 作为解释碳基团对煤尘润湿性(接触角) 影响程度的公因子, 贡献95.366%的因素, 是碳基团的主要影响因子, 羟基(-OH) 作为解释氧基团对煤尘润湿性(接触角) 影响程度的公因子, 贡献94.818%的因素, 是氧基团的主要影响因子.
- 煤尘 /
- NMR和XPS /
- 基团演化 /
- 润湿性影响程度
Abstract: Carbon and oxygen elements were studied to explore the effect of structural differences on wettability of coal dust. Surface distribution characteristics of carbon and oxygen groups in 6 coal dusts with different metamorphic grades were examined through NMR and XPS. The evolution of different types of carbon and oxygen groups was obtained using distance analysis. With increasing metamorphic degree a kind of group changes along with variation of other groups in most case, which is a process of clustering. The carbon in Ar-C, -COOH, CH₂ and Ar-O (R-O) has the similar evolution law, the oxygen in -OH and C-O-C is the same case. Factor analysis was used to know effect of group evolution on wettability of coal dust. It is found that Ar-C, as the common factor covering 95.366% to explain coal dust wettability (contact angle), is the main factor of carbon groups; while -OH covering 94.818% is the main factor of oxygen groups.
- coal dust /
- NMR and XPS /
- evolution of the groups /
- wetting influence degree

HTML全文

图 1 六种煤尘的¹³C-NMR分峰图

Figure 1 Curve-fitted ¹³C-NMR spectra of 6 kinds of coal dusts

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图 2 碳基团变量随变质程度加深的变化

Figure 2 Change of carbon groups along with metamorphic grades

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图 3 碳谱的分峰示意图

Figure 3 Peak fitting of carbon spectra

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图 4 氧谱的分峰示意图

Figure 4 Peak fitting of oxygen spectra

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图 5 碎石图

Figure 5 Scree plot

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表 1 实验用煤样

Table 1 Coal samples

Number	Coal type	Sample point	Station
HM	Lignite	4301 working face of Beizao coal	Longkou, Shandong
CY	Long flame coal	12207 working face of Shangwan coal	Ordos, Inner Mongolia
QM	Gas coal	20102 working face of Yushuwan coal	Yulin, Shanxi
FM	Fat coal	1301N working face of Xinjulong coal	Heze, Shandong
JM	Coking coal	1013 working face of Wugou coal	Huaibei, Anhui
WY	Anthracite	8124 working face of Yangquan coal	Yangquan, Shanxi

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表 2 煤尘的工业分析及元素分析

Table 2 Proximate and ultimate analyses of coal dust

Number	Proximate analysis w/%				Ultimate analysis w_daf/%
Number	M_ad	A_d	V_daf	FC_ad	C	O	H	N	S
HM	17.16	13.19	57.39	30.64	72.88	15.02	8.66	2.36	1.08
CY	10.47	6.77	55.42	37.21	80.21	12.85	4.27	0.86	1.81
QM	5.49	7.35	40.11	52.44	83.89	10.09	4.96	0.82	0.24
FM	1.86	7.73	36.22	57.75	86.14	6.16	5.32	1.79	0.59
JM	1.55	5.69	27.53	62.29	87.34	4.80	5.71	1.56	0.59
WY	1.70	4.03	8.50	86.32	91.79	2.31	3.81	1.43	0.66

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表 3 含碳官能团分布

Table 3 Distribution of carbon-containing functional groups

Number	C=O	-COOH	Ar-O	Ar-C, H	CH₃	CH₂	R-O
HM	1.2	3.1	10.7	38.9	7.4	32.4	6.3
CY	0.8	2.3	9.4	51.1	14.1	17.8	4.5
QM	0.4	1.5	9.0	60.5	7.6	16.6	4.4
FM	1.5	1.3	3.5	68.3	7.2	14.5	3.7
JM	0.5	0.7	3.4	77.2	5.5	9.5	3.2
WY	0.8	0.3	0.6	91.0	3.5	2.8	1.0

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表 4 碳基团距离分析的近似矩阵

Table 4 Approximate matrix of distance analysis on carbon groups

Group	Correlation between variables
Group	C=O	-COOH	Ar-O	Ar-C, H	CH₃	CH₂	R-O	C=O
C=O	1.000	0.337	-0.038	-0.252	0.039	0.357	0.233	1.000
-COOH	0.337	1.000	0.909	-0.985	0.629	0.962	0.933	0.337
Ar-O	-0.038	0.909	1.000	-0.950	0.678	0.869	0.912	-0.038
Ar-C, H	-0.252	-0.985	-0.950	1.000	-0.660	-0.961	-0.971	-0.252
CH₃	0.039	0.629	0.678	-0.660	1.000	0.434	0.540	0.039
CH₂	0.357	0.962	0.869	-0.961	0.434	1.000	0.967	0.357
R-O	0.233	0.933	0.912	-0.971	0.540	0.967	1.000	0.233
C=O	1.000	0.337	-0.038	-0.252	0.039	0.357	0.233	1.000

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表 5 煤尘表面含氧官能团分布

Table 5 Distribution of oxygen-containing functional groups in coal dust surface

Number	Mole percentage w_mol/%
Number	C-OH	COOH	C=O	C-O-C
HM	38.40	27.57	11.52	22.51
CY	30.00	31.29	8.24	30.48
QM	28.92	22.78	15.31	32.98
FM	22.79	14.89	12.37	49.94
JM	18.05	8.02	25.14	48.79
WY	13.02	6.19	29.38	51.41

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表 6 氧基团距离分析的近似矩阵

Table 6 Approximate matrix of distance analysis on oxygen groups

Group	Correlation between variables
Group	C-OH	COOH	C=O	C-O-C
-OH	1.000	0.909	-0.834	-0.946
COOH	0.909	1.000	-0.897	-0.911
C=O	-0.834	-0.897	1.000	0.698
C-O-C	-0.946	-0.911	0.698	1.000

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表 7 煤尘平衡接触角

Table 7 Equilibrium contact angle of coal dust

Number	Contact angle /(°)
Number	1	2	3	average
HM	46.7	48.12	46.34	47.05
CY	55.19	56.43	56.22	55.95
QM	56.58	58.75	56.12	57.15
FM	62.07	62.67	62.38	62.37
JM	65.48	64.17	66.74	65.46
WY	72.34	74.12	72.19	72.88

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表 8 碳基团与润湿性的相关性分析

Table 8 Correlation between wettability and carbon groups

Group	Regression equation	R²
C=O	-	-
-COOH	Y=72.92-8.33x	0.92
Ar-O	Y=72.59-2.04x	0.87
Ar-C, H	Y=29.67+0.47x	0.98
CH₃	Y=70.69-1.4x	0.15
CH₂	Y=73.83-0.88x	0.95
R-O	Y=79.41-5x	0.97

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表 9 氧基团与润湿性的相关性分析

Table 9 Correlation between wettability and oxygen groups

Group	Regression equation	R²
-OH	Y=84.51-0.97x	0.98
COOH	Y=74.05-0.75x	0.72
C=O	Y=45.4+0.87x	0.59
C-O-C	Y=33.68+0.67x	0.82

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表 10 公因子方差表

Table 10 Communality table

Component	Communality
Component	initial	extraction
Ar-C, H	1.000	0.994
-COOH	1.000	0.962
Ar-O	1.000	0.902
CH₂	1.000	0.951
R-O	1.000	0.960
-OH	1.000	0.956
COOH	1.000	0.932
C-O-C	1.000	0.957

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表 11 解释的总方差表

Table 11 Explained variance table

Component	Total variance explained
	initial eigenvalues			extraction of square and loads
	total	variance /%	component /%	total	variance /%	component /%
Ar-C, H	4.768	95.366	95.366	4.768	95.366	95.366
-COOH	0.144	2.871	98.237
Ar-O	0.069	1.381	99.617
CH₂	0.019	0.374	99.991
R-O	0.000	0.009	100.000
-OH	2.845	94.818	94.818	2.845	94.818	94.818
COOH	0.101	3.381	98.199
C-O-C	0.054	1.801	100.000
extraction method: principal component analysis

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