摘要
为了揭示煤矿地下水库水体中离子的变化规律,阐明其自净化机理,并为其建设与发展提供理论依据。通过对神东大柳塔煤矿地下水库原位进出水水样水质分析、水化学类型分析和其中主要离子来源解析,设计4组煤矿地下水库泥岩和细砂岩分别与去离子水和矿井水的水-岩相互作用模拟实验,采用图示法、离子比值法等手段揭示煤矿地下水库水体中主要离子的变化规律及其来源。结果表明:大柳塔煤矿地下水库发生的主要水-岩相互作用为阳离子交换反应,黄铁矿氧化,方解石、白云石以及硅酸盐矿物的溶解。阳离子交换反应使得Na^+浓度增大而Ca^2+浓度减少、水化学类型由进水的SO4·Cl-Ca型向出水的SO 4·Cl-Na型转变以及造成Na^+浓度相对Cl-浓度过量而r(Ca^2++Mg^2+)浓度相对于r(HCO3^-+SO4^2-)浓度亏缺的主要原因;且随着水-岩相互作用的进行,泥岩和细砂岩的钠吸附比均逐渐增大,阳离子交换反应逐渐减弱。煤矿地下水库水体中SO4^2-部分来源于黄铁矿氧化,其中泥岩的方解石含量相对于白云石含量较多,主要是黄铁矿氧化与方解石发生中和反应;而细砂岩中白云石含量较多,主要是黄铁矿氧化与白云石发生中和反应。矿井水中Na^+主要来自钠长石和正长石等硅酸盐矿物的溶解,泥岩组和细砂岩组Ca^2+和Mg^2+的主要来源分别是方解石和白云石的溶解。
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 Ca^2+concentration,and the hydrochemical type changed from SO 4·Cl-Ca type of influent to SO 4·Cl-Na type of effluent which caused the concentration of Na+higher than that of Cl-and the concentration of r(Ca^2++Mg^2+)lower than that of r(HCO-3+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 Ca^2+and Mg^2+in mudstone and fine sandstone formations were the dissolution of calcite and dolomite,respectively.
作者
张凯
高举
蒋斌斌
韩佳明
陈梦圆
ZHANG Kai;GAO Ju;JIANG Binbin;HAN Jiaming;CHEN Mengyuan(School of Resource and Safety Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China;State Key Laboratory of Water Resources Protection and Utilization in Coal Mining,Beijing 100083,China)
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2019年第12期3760-3772,共13页
Journal of China Coal Society
基金
国家重点实验室开放基金资助项目(SHJT-16-30.8/SHJT-17-42.2)
中国矿业大学(北京)越崎青年学者资助项目(2019QN08)
国家重点研发计划资助项目(2018YFC0406404)
关键词
煤矿地下水库
水-岩相互作用
离子来源
离子变化规律
矿井水
coal mine underground reservoir
water-rock interaction
ion sources
ion variation law
mine water
