不同预处理方法对准东高碱煤中碱金属含量测定的影响

宋维健; 宋国良; 齐晓宾; 吕清刚

不同预处理方法对准东高碱煤中碱金属含量测定的影响

宋维健^{1, 2},
宋国良^1, ,,
齐晓宾^{1, 2},
吕清刚¹

基金项目:

中国科学院战略性先导科技专项(A类) XDA07030100

国家国际科技合作专项 2014DFG61680

详细信息

中图分类号: TQ533.16
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出版历程
- 收稿日期: 2015-09-11
- 修回日期: 2015-11-05

Effect of pretreatment methods on the determination of alkali metal content in high alkali metal Zhundong coal

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Corresponding author: SONG Guo-liang, E-mail: songgl@iet.cn

摘要

摘要: 以四种不同的准东高碱煤及气化飞灰为研究对象,对高碱煤及气化飞灰中碱金属(Na、K)的赋存形态,以及不同预处理方法(低温灰化法、直接消解法、中国国标法、萃取法及氧弹燃烧法)对准东高碱煤及气化飞灰中碱金属(Na、K)含量测定的影响进行了测试分析。结果表明,准东高碱煤中碱金属Na主要以水溶态形式存在,碱金属K主要以水不溶态形式存在;不同的预处理方法对准东高碱煤中碱金属(Na、K)含量的测定结果影响显著,对于准东高碱煤及气化飞灰中碱金属(Na、K)含量测定,建议采用氧弹燃烧法,萃取法也可以相对准确地反映煤中碱金属Na的含量。
- 碱金属测定 /
- 预处理方法 /
- 低温灰化 /
- 微波消解 /
- 氧弹燃烧
Abstract: High alkali metal coal from four coal mines in Zhundong coalfield and its gasification fly ash were used to investigate the occurrence of alkali metal with five pretreatment methods including low temperature ashing,microwave digestion,national standards,cascade extraction and oxygen bomb combustion.The results show that the sodium in the high alkali metal coal exists mainly in the water soluble form,and the potassium is in the water insoluble form;The method of oxygen bomb combustion is the optimum one to determine the content of Na and K in high alkali coal and gasification fly ash,and the method of cascade extraction is also a better one to determine the content of Na.
- alkali metal determination /
- pretreatment methods /
- low temperature ashing /
- microwave digestion /
- oxygen bomb combustion

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图 1 样品中不同赋存形态的碱金属Na含量

Figure 1. Sodium content of different forms in the samples

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图 2 样品中不同赋存形态的碱金属K含量

Figure 2. Potassium content of different forms in the samples

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图 3 不同检测方法下碱金属Na含量

Figure 3. Sodium content with different determination methods

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图 4 不同检测方法下碱金属K含量

Figure 4. Potassium content with different determination methods

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表 1 实验样品的工业分析和元素分析

Table 1. Proximate and ultimate analysis

Sample	Proximate analysis w_ar/%				Ultimate analysis w_ar/%
Sample	M	A	V	FC	C	H	O	N	S
TCML	21.60	2.89	24.73	50.78	59.07	2.76	12.79	0.48	0.41
TCWCW	18.20	9.40	24.86	47.53	56.41	2.68	11.71	0.63	0.97
SHZDM	19.60	4.79	32.64	43.14	51.86	1.62	21.09	0.66	0.38
SEH	11.50	14.58	30.30	14.58	51.26	2.35	19.62	0.58	0.11
QHH	4.12	20.11	9.56	66.20	70.70	0.89	0.68	0.66	2.84

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表 2 实验样品的灰成分分析

Table 2. Ash component analysis

Sample	Content w/%
Sample	SiO₂	Al₂O₃	Fe₂O₃	CaO	MgO	TiO₂	SO₃	P₂O₅	K₂O	Na₂O
TCML	3.73	6.16	5.37	33.45	5.42	0.41	29.34	0.00	0.45	7.28
TCWCW	20.81	10.54	29.7	11.36	4.51	0.60	14.91	0.04	0.89	2.71
SHZDM	17.24	11.90	5.76	28.74	5.34	0.60	19.58	0.05	0.38	3.92
SEH	41.98	17.59	6.78	19.39	2.49	1.08	1.82	0.18	0.66	4.38
QHH	6.18	13.23	6.17	29.42	7.05	0.57	24.42	0.10	0.55	2.89

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表 3 不同检测方法碱金属Na的回收率

Table 3. Recoveries for sodium with different determination methods

Sample	Recoveries η/%
Sample	NS	LTA	MD	CE	OBC
TCML	45.30	56.73	84.09	94.77	100
TCWCW	56.40	66.42	58.54	99.02	100
SHZDM	39.40	79.45	77.27	100.7	100
SEH	58.21	63.83	84.78	99.24	100
QHH	57.95	78.18	88.64	100	100

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