干旱区高矿化度矿井水的水化学特征与成因——以陕北大海则煤矿为例  

Hydrochemical characteristics and formation of mine water with high salinity in arid area:A case study of Dahaize coalfield,Shanbei

作　　者：智宝岩 李和平 梁向阳 郭红波 梁士昌 肖彬虎 ZHI Baoyan;LI Heping;LIANG Xiangyang;GUO Hongbo;LIANG Shichang;XIAO Binhu(China Coal Shaanci Energy and Chemical Group Co.,Ltd.,Yulin 719000,China;CCTEG Xi'an Research Institute(Group)Co.,Ltd.,710077,Xi'an 710077,China;China Coal Shaanxi Yulin Energy Chemical Co.,Ltd.,Shaanxi,Yulin 719000)

机构地区：[1]中煤陕西能源化工集团有限公司,陕西榆林719000 [2]中煤科工西安研究院(集团)有限公司,西安710077 [3]中煤陕西榆林能源化工有限公司,陕西榆林719000

出　　处：《南水北调与水利科技（中英文）》2024年第S01期75-83,共9页South-to-North Water Transfers and Water Science & Technology

基　　金：陕西省自然科学基础研究计划项目(2023-JC-QN-0291);中煤科工集团西安研究院有限公司科技创新基金资助项目(2022XAYJS06)。

摘　　要：为揭示干旱区高矿化度矿井水水化学特征,采集大海则煤矿地下水及矿井水水样38组,借助Piper三线图、同位素技术、Schoeller图、Gibbs图、离子比例系数图等手段研究高矿化度矿井水的水文地球化学特征,并揭示其成因机制,提出相应的处理措施。结果表明:研究区各充水含水层水样以阳离子Na+为主,阴离子以SO_(4)^(2-)为主;直罗组地下水及矿井水溶解性总固体(TDS)均超出标准限值,TDS质量浓度均值分别为2768.57、3057.07mg/L;第四系水、洛河组及安定组地下水水化学类型以HCO_(3)^(-)Ca型为主,少量HCO_(3)^(-)Na型,直罗组地下水及矿井水水化学类型为SO_(4)^(-)Na型,直罗组地下水与矿井水δ(D)和δ(^(18)O)值差异小,矿井水主要来源于直罗组地下水补给;矿井水矿化度较高与直罗组地下水矿化度高直接相关,高矿化度地下水在蒸发浓缩和岩石风化控制双重控制下逐步演化形成,钠主要来自钠长石等硅酸盐矿物的溶解、硫酸根来自于石膏的溶解、钙离子除来源于石膏溶解外,还与钙长石等硅酸盐矿物的溶解有关;除此,主要离子的演化的还受阳离子交换作用的影响;矿井水TDS质量浓度为500~3000 mg/L,选择纳滤和反渗透联合对其进行处理,处理后可直接用于生产、生活或者生态。The research and analysis of hydrochemical characteristics and formation mechanism of highly mineralized mine water in arid areas are of great significance for zero discharge and resource utilization of mine water in western mining areas.In this paper,38 sets of groundwater samples collcted from Dahaize Coalfield,the hydrochemical characteristics of high salinity mine water by means of Piper tri-line diagram,isotope,Scholler diagram,Gibbs diagram and ion combination proportion diagram and revealed its formation mechanism.The results indicate that the water samples of each water-flld aquifer in the study area are Na^(+)and anions SO_(4)^(2-);The average concentrations of TDS in Zhiluo and mine water were 2768.57 mg/L and.3057.07 mg/L.The hydrochemical types of groundwater in the Quaternary water,Luohe formation and Anding formation are mainly HCO_(3)^(-)Ca,with a small amount of HCO_(3)^(-)Na.The hydrochemical type of water in Zhiluo formation and mine water are SO_(4)^(-)Na,the groundwater in the Zhiluo formation aquifer,the difference of 8(D)and 8(18O)between Zhiluo formation groundwater and mine water is small,and mine water mainly comes from groundwater recharge of Zhiluo formation aquifer.The higher salinity of mine water is directly related to the higher salinity of groundwater in Zhiluo formation.The highly minera lized groundwater gradually evolved under the dual control of evaporation concentration and rock weat hering.Sodium mainly came from the dissolution of silicate minerals such as albite,sulfate came from the dissolution of gypsum,and calcium ions were related to the dissolution of silicate minerals such as calcium feldspar in addition to the dissolution of gypsum.In addit ion,the evolution of major ions is also influenced by cation exchange.

关 键 词：高矿化度 矿井水 大海则煤矿 水化学特征 形成机制 

分 类 号：TD745[矿业工程—矿井通风与安全]