高钠煤中钠的赋存形态研究

郭帅; 霍晓东; 宋双双; 蒋云峰; 赵建涛; 房倚天

高钠煤中钠的赋存形态研究

郭帅^{1, 2},
霍晓东^{3, 4},
宋双双¹,
蒋云峰¹,
赵建涛^1, ,,
房倚天¹

1.
中国科学院山西煤炭化学研究所, 山西太原 030001
2.
中国科学院大学, 北京 100049
3.
山西煤炭进出口集团科学技术研究院有限公司, 山西太原 030006
4.
山西煤炭进出口集团博士后科研工作站, 山西太原 030006

基金项目:

国家自然科学基金 21576276

国家自然科学基金 21506241

中国科学院战略性先导科技专项 XDA07050100

详细信息

通讯作者:
赵建涛, Tel/Fax:0351-2021137, E-mail:zhaojt@sxicc.an.cn

中图分类号: P618.11
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- 被引次数: 0
出版历程
- 收稿日期: 2017-06-16
- 修回日期: 2017-07-25
- 网络出版日期: 2021-01-23
- 刊出日期: 2017-10-10

Occurrence modes of sodium species in sodium-rich coals

1.
Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China
2.
University of Chinese Academy of Sciences, Beijing 100049, China
3.
The Sci-Tech Academy of Shanxi Coal Imp. & Exp. Group Co. Ltd., Taiyuan, 030006, China
4.
Post-Doctoral Research Center of Shanxi Coal Imp. & Exp. Group Co. Ltd., Taiyuan, 030006, China

Funds:

the National Natural Science Foundation of China 21576276

the National Natural Science Foundation of China 21506241

Strategic Priority Research Program of the Chinese Academy of Sciences XDA07050100

摘要

摘要: 以高钠煤为研究对象，采用X射线衍射（XRD）、扫描电子显微镜（SEM）、红外光谱仪（FT-IR）傅里叶分析手段相结合的方法研究了煤中钠的赋存形态及其含量分布。结果表明，大多数煤中钠主要是以水溶性钠为主，有机钠次之，不溶性钠含量较低。水溶性钠主要是以钠硝石（NaNO₃）、岩盐（NaCl）和水合离子（Na·xH₂O）形式存在；有机钠主要是以羧基钠（-COONa）形式存在；不溶性钠主要是以钠长石（NaAlSi₃O₈）形式存在。
- 高钠煤 /
- 赋存形态 /
- 钠
Abstract: The occurrence modes of sodium species and corresponding content distributions in sodium-rich coals were investigated through a series of analytical methods. The results indicate that for the vast majority of coals sodium are mainly in the form of water-soluble form, then organic form, and the content of insoluble form is negligible. Among them, the water-soluble sodium is mainly presented as nitratine (NaNO₃), halite (NaCl) and hydrated ion (Na·xH₂O). The organic sodium is mainly presented as carboxyl sodium (-COONa), while the insoluble sodium mainly occurs as albite (NaAlSi₃O₈).
- sodium-rich coal /
- occurrence mode /
- sodium

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图 1 原煤低温灰化示意图

Figure 1 Schematic diagram of low-temperature ashing

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图 2 溶剂萃取装置示意图

Figure 2 Schematic diagram of solvent extraction

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图 3 煤中钠的含量

Figure 3 Content of sodium in sodium-rich coals

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图 4 煤中钠的赋存形态含量分布

Figure 4 Distribution of sodium species in coal

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图 5 原煤低温灰的XRD谱图

Figure 5 XRD patterns of low-temperature ashes

(A: albite (NaAlSi₃O₈); B: boehmite (AlO(OH)); C: calcite (CaCO₃); H: halite (NaCl); K: kaolinite (Al₂Si₂O₅(OH)₄); N: nitratine (NaNO₃); P: pyrite (FeS₂); Q: quartz (SiO₂); S: siderite (FeCO₃))

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图 6 澳大利亚褐煤的SEM照片

Figure 6 SEM of AU coal

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图 7 原煤的FT-IR谱图

Figure 7 FT-IR spectra of raw coals

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表 1 原煤的工业分析和元素分析

Table 1 Proximate and ultimate analysis

Sample	Proximate analysisw/%			Ultimate analysisw_daf/%
Sample	M_ad	A_d	V_daf	C	H	O^a	N	S_t
ZD-1	10.65	3.82	28.93	82.06	3.47	13.25	0.87	0.35
ZD-2	8.97	19.04	29.44	77.30	4.00	17.79	0.73	0.18
HC	5.29	6.44	33.55	79.01	4.48	15.15	0.97	0.39
AU	12.56	27.71	52.84	67.22	5.16	21.21	0.93	5.47
^a: by difference; ad: air-dried base; daf: dry and ash free base

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表 2 灰成分分析

Table 2 Chemical compositions of ash

Sample	Content w/%
Sample	SiO₂	Al₂O₃	Fe₂O₃	CaO	MgO	TiO₂	SO₃	K₂O	Na₂O	P₂O₅
ZD-1	27.02	13.97	13.10	20.28	4.61	0.63	7.94	0.20	12.21	0.05
ZD-2	55.39	14.34	7.02	11.20	3.57	0.64	1.35	1.25	4.64	0.19
HC	26.09	15.58	1.50	26.03	0.01	3.45	21.95	1.31	4.27	0.03
AU	35.17	3.43	5.61	6.95	9.59	0.16	17.13	0.61	20.55	0.32

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表 3 煤中Cl的含量及其Na-W和Cl物质的量比

Table 3 Content of Cl in coal and the molar ratio of Na-W/Cl

	ZD-1	ZD-2	HC	AU
Clw/(mg·g^-1)	0.45	0.66	0.23	89.49
Na-W/Cl (mol ratio)	8.52	7.09	11.37	0.99

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表 4 高钠煤中钠的主要赋存形态

Table 4 Primary occurrence modes of sodium in the sodium-rich coals

Sample	Occurrence modes of sodium
ZD-1	NaNO₃, (-COONa)
ZD-2	Na· xH₂O, NaAlSi₃O₈
HC	Na· xH₂O
AU	NaCl, (-COONa)

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