Understanding of mineral change mechanisms in coal mine groundwater reservoir and their influences on effluent water qua
- PDF / 2,558,209 Bytes
- 14 Pages / 595.276 x 790.866 pts Page_size
- 45 Downloads / 158 Views
Understanding of mineral change mechanisms in coal mine groundwater reservoir and their influences on effluent water quality: a experimental study Kai Zhang1,2
•
Huifang Li1,2 • Jiaming Han1,2 • Binbin Jiang1,2 • Ju Gao1,2
Received: 3 December 2019 / Revised: 8 July 2020 / Accepted: 9 September 2020 The Author(s) 2020
Abstract This paper presents results of an experimental study to characterize the law of mineral change of fallen rock in coal mine groundwater reservoir ant its influence on water quality. The minerals of the underground reservoir of Daliuta Coal Mine is taken as the research object. Simulation experiments were designed and conducted to simulate water–rock action in the laboratory. The mineral composition was analyzed by X-ray diffractometer (XRD), the surface morphology of the mineral was analyzed by scanning electron microscope (SEM), and the specific surface area, total pore volume and average pore diameter of the mineral were measured by fast specific surface/pore analyzer (BET). The experimental results show that the sandstone and mudstone in the groundwater reservoir of Daliuta Coal Mine account for 70% and 30%, respectively. The pore diameter is 15.62–17.55 nm, and pore volume is 0.035 cc/g. Its pore structure is a key factor in the occurrence of water–rock interaction. According to the water–rock simulation experiment, the quartz content before the water–rock action is about 34.28%, the albite is about 21.84%, the feldspar is about 17.48%, and the kaolinite is about 8.00%. After the water–rock action, they are 36.14%, 17.78%, 11.62%, and 16.75%, respectively. The content of albite and orthoclase is reduced while the content of kaolinite is increased, that is, the Na? content becomes higher, and the Ca2? and Mg2? contents become lower. This research builds a good theoretical foundation for revealing the role of water and rock in underground coal reservoirs. Keywords Coal mine underground reservoir Fallen rock Water–rock interaction Rock composition
1 Introduction After coal mining, a large number of gobs are formed at different mining levels. With the end of the disturbance of overburden strata, the gob tends to be stable and a large void space is formed, which provides space for mine water storage due to the impermeability of the floor. The underground reservoir is a water conservancy project with
& Kai Zhang [email protected] 1
School of Chemical and Environmental Engineering, China University of Mining and Technology, Beijing, Beijing 100083, China
2
State Key Laboratory of Water Resource Protection and Utilization in Coal Mining, Beijing 102211, China
the emphasis on storage capacity, which is formed by the gap between the rock and soil as the water storage space. It is a systematic project of artificial recharge of groundwater, underground storage of water resources, and human activities of exploitation (Du et al. 2008). Since coal mines are usually located in a region where water resources are scarce or severely deficient, the use of underground reservoir is of grea
Data Loading...
