华北地区地下水金属离子迁移演变模拟分析

Simulation analysis of metal ion migration and evolution in groundwater of a mining area in Inner Mongolia

采矿过程中产生的生产地下水无机化学成分复杂,容易对环境造成影响。因此,地下水迁移过程中水化学特征的迁移演化模拟将有助于深入理解地下水的内在组成特征。本文利用PHREEQE软件对某矿区生产地下水的水化学演进特征进行模拟,分析典型地下水中主要离子在特征温度及pH条件下的水化学迁移特征。研究结果表明:(1)随着矿区地下水的迁移,该矿区地下水水样中的浓度较高成分为SO_(4)^(2-)、Ca^(2+)、CaSO_(4)(aq)、Mg^(2+)及Zn^(2+)(aq);(2)在地下水迁移过程中,水化学组成中的部分成分为过饱和状态且具有明显生成沉淀的趋势。研究结果对理解矿区开采地下水的水化学迁移特征具有一定的参考价值,将为开采工艺选取及地下水的高效节能处置提供重要的理论指导。

The inorganic chemical composition of the production groundwater produced in the mining process is complex and easily affects the environment.Therefore,the migration and evolution simulation of the hydrochemical characteristics during the groundwater migration process will help to deeply understand the intrinsic composition characteristics of groundwater.This paper uses PHREEQE software to simulate the hydrochemical evolution characteristics of groundwater produced in a mining area,and analyzes the hydrochemical migration characteristics of main ions in typical groundwater under the conditions of characteristic temperature and pH.The research results show that:(1)With the migration of groundwater in the mining area,the higher concentrations of components in the groundwater samples of the mining area are SO_(4)^(2-),Ca^(2+),CaSO_(4)(aq),Mg^(2+)and Zn^(2+)(aq);(2)During the groundwater migration process,some of the components in the water chemical composition are in a supersaturated state and have a clear tendency to form precipitation.The research results have a certain reference value for understanding the hydrochemical migration characteristics of groundwater mining in mining areas,and provide important theoretical guidance for the selection of mining technology and the efficient and energy-saving disposal of groundwater.