Effect of in-situ pyrolysis on physical properties of oil shale and groundwater quality

doi:10.16085/j.issn.1000-6613.2022-1394

Abstract

Abstract:

After the process of in-situ pyrolysis mining of oil shale, its lithology and composition would change significantly, then the groundwater intrusion of the mining area will lead to water pollution. Therefore, this study explored the effects of heavy metals and extractable petroleum substances released from oil shale char at different pyrolysis temperatures on the groundwater quality. The pyrolysis of oil shale semi-coke which at 100—500℃ under normal pressure was selected for physical property characterization experiments, and it was divided into two groups with particle size ≤2mm. The study was on the specific surface area, and the microstructure of oil shale and the changes of proportion of elements before and after pyrolysis of oil shale were measured. At the same time, the pyrolysis semi-coke was soaked to detect the content of heavy metals Fe, Mn and Cr in water samples. The maximum concentration reached 9.07mg/L, 5.26mg/L, 0.053mg/L, and the result showed that it exceeded the class V water standard of groundwater quality standard (GB/T 14848—2017), in the mean while the analysis showed that the excessive heavy metal elements were mainly caused by the immersion of mineral components of oil shale into water after pyrolysis, which was related to the changes in physical properties of oil shale caused by in-situ pyrolysis. At the same time, it was found that the effect of extractable petroleum substances on groundwater reached the maximum when the pyrolysis temperature was 400℃.

Key words: oil shale, pyrolysis, immersion experiment, heavy metal, petroleum hydrocarbon

摘要：

油页岩原位热解开采后，其岩性和组分会发生显著变化，地下水入侵采矿区会导致水质的污染。因此本文针对不同热解温度下油页岩半焦释放重金属和可萃取石油类物质对地下水水质的影响进行了探索。选取两组油页岩制成粒径≤2mm的样品，进行100~500℃常压热解半焦物性表征实验，研究测定了油页岩热解前后的比表面积、油页岩微观结构、元素含量占比变化，同时将热解半焦进行浸泡实验，检测水样中重金属Fe、Mn、Cr含量，最高浓度可达到9.07mg/L、5.26mg/L、0.053mg/L，超出地下水质量标准（GB/T 14848—2017）Ⅴ类水标准。分析表明，重金属元素超标主要为热解后油页岩中的矿物成分浸入水中所致，与油页岩热解后物性变化相关。同时发现，可萃取石油类物质对地下水的影响在热解温度为400℃时达到最大。

关键词: 油页岩, 热解, 浸泡实验, 重金属, 石油烃

CLC Number:

X824

LI Ruolin, HE Shaolin, YUAN Hongying, LIU Boyue, JI Dongli, SONG Yang, LIU Bo, YU Jiqing, XU Yingjun. Effect of in-situ pyrolysis on physical properties of oil shale and groundwater quality[J]. Chemical Industry and Engineering Progress, 2023, 42(6): 3309-3318.

李若琳, 何少林, 苑宏英, 刘伯约, 纪冬丽, 宋阳, 刘博, 余绩庆, 徐英俊. 原位热解对油页岩物性及地下水水质影响探索[J]. 化工进展, 2023, 42(6): 3309-3318.

Figures/Tables 9

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序号	元素	y	R	检测限/μg·L^-1
1	Fe	0.0225x+0.9227	0.9997	5.606
2	Mn	0.0170x+0.0291	1.0000	0.109
3	Cu	0.0211x+0.0644	1.0000	0.043
4	Zn	0.0064x+0.1747	0.9918	1.000
5	As	0.0022x+0.0007	1.0000	0.048
6	Cd	0.0030x+0.0008	1.0000	0.010
7	Cr	0.0028x+0.1256	1.0000	0.426
8	Pb	0.0058x+0.0061	1.0000	0.047
9	Sb	0.0085x+0.0010	1.0000	0.012
10	Ni	0.0212x+0.1442	1.0000	0.893
11	Co	0.0355x+0.0007	1.0000	0.020
12	Mo	0.0071x+0.0022	1.0000	0.139

序号	元素	y	R	检测限/μg·L^-1
1	Fe	0.0225x+0.9227	0.9997	5.606
2	Mn	0.0170x+0.0291	1.0000	0.109
3	Cu	0.0211x+0.0644	1.0000	0.043
4	Zn	0.0064x+0.1747	0.9918	1.000
5	As	0.0022x+0.0007	1.0000	0.048
6	Cd	0.0030x+0.0008	1.0000	0.010
7	Cr	0.0028x+0.1256	1.0000	0.426
8	Pb	0.0058x+0.0061	1.0000	0.047
9	Sb	0.0085x+0.0010	1.0000	0.012
10	Ni	0.0212x+0.1442	1.0000	0.893
11	Co	0.0355x+0.0007	1.0000	0.020
12	Mo	0.0071x+0.0022	1.0000	0.139

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