Experimental study on the mechanism of water-rock interaction in the coal mine underground reservoir

被引：0
|
作者：
Zhang K. [1 ]
Gao J. [1 ]
Jiang B. [1 ,2 ]
Han J. [1 ]
Chen M. [1 ]
机构：
[1] School of Resource and Safety Engineering, China University of Mining and Technology(Beijing), Beijing
[2] State Key Laboratory of Water Resources Protection and Utilization in Coal Mining, Beijing
来源：
Meitan Xuebao/Journal of the China Coal Society | 2019年 / 44卷 / 12期
关键词：
Coal mine underground reservoir; Ion sources; Ion variation law; Mine water; Water-rock interaction;
D O I：
10.13225/j.cnki.jccs.SH19.0977
中图分类号：
学科分类号：
摘要：
In order to explain the variation law of ions in the water body of underground reservoir of coal mine, clarify its self-purification mechanism, and provide a theoretical basis for its construction and development, based on the analysis of water quality, hydrochemical types and ion sources of in-situ water samples from Daliuta coal mine underground reservoir in Shendong, four groups of simulation experiments of water-rock interaction of mudstone and fine sandstone with deionized water and mine water was designed, and the variation law and source of main ions in the water body of underground reservoir were revealed by graphic method and ion ratio method. The results showed that the main water-rock interactions in the underground reservoir of Daliuta coal mine were cation exchange reaction, pyrite oxidation, dissolution of calcite, dolomite and silicate minerals. Cation exchange reaction increased Na+ concentration while decreased Ca2+ concentration, and the hydrochemical type changed from SO4•Cl- Ca type of influent to SO4•Cl- Na type of effluent which caused the concentration of Na+ higher than that of Cl- and the concentration of r(Ca2++Mg2+) lower than that of r(HCO3 -+SO4 2-).With the water-rock interaction proceeding, the sodium adsorption ratio of mudstone and fine sandstone increased and the cation exchange reaction was weakened gradually. Part of SO4 2- in the water body of underground reservoir of coal mine was from pyrite oxidation, in which the calcite content of mudstone was more than dolomite content, mainly pyrite oxidation and neutralization reaction with calcite, while fine sandstone had more dolomite, mainly pyrite oxidation and neutralization reaction with dolomite. Na+ mainly came from the dissolution of silicate minerals such as albite and orthoclase, and the main sources of Ca2+ and Mg2+ in mudstone and fine sandstone formations were the dissolution of calcite and dolomite, respectively. © 2019, Editorial Office of Journal of China Coal Society. All right reserved.
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页码：3760 / 3772
页数：12
相关论文
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