水文地质工程地质2025，Vol.52Issue(4)：98-108,11.DOI:10.16030/j.cnki.issn.1000-3665.202412025
陕北某露天煤矿矿坑涌水化学特征及灌溉适宜性
Chemical characteristics and irrigation suitability of mine pit water at an open-cast coal mine in northern Shaanxi
摘要
Abstract
In the arid and semi-arid middle reaches of the Yellow River in northwest China,an open-cast coal mine has adopted the use of pit water for ecological irrigation in dump reclamation areas,which is an effective approach for the pit water resource utilization.However,the irrigation water quality and the interactions between the pit water and soil in the long-term irrigation remain insufficiently understood.Field sampling,water chemical testing,and soil column leaching experiments in lab were conducted to analyze the mine pit water quality and the water-soil interactions during the irrigation process.The irrigation suitability of pit water was evaluated by using indicators such as sodium adsorption ratio,soluble sodium percentage,residual sodium carbonate,and permeability index.The results show that the water chemical type of the pit water is HCO3-Na,with Na+as the main cation and HCO-as the main anion.The water chemical composition is mainly influenced by cation exchange and mineral dissolution.Total dissolved solids are mainly derived from Na+,Cl-,SO42-,and HCO3-.The pit water can be directly used for irrigation.During the leaching experiment,dissolution and cation exchange were evident,with a significant increase in Ca2+concentration in the early leachate.As the leaching experiment progressed,the water chemical type of the leachate gradually evolved from HCO3-Ca type to HCO3-Na type;with the increase of leaching time,the cation exchange intensity in the leachate increased,and the irrigation evaluation indicators in the leachate showed an increasing trend,though remaining within acceptable irrigation thresholds.This study can provide a basis for the rational utilization of mine pit water.关键词
矿坑涌水/水化学/灌溉适宜性/土柱淋滤Key words
mine pit water/hydrogeochemistry/irrigation suitability/soil column leaching分类
矿业与冶金引用本文复制引用
白浩,籍丽勇,李国庆,刘斌,李松瑶,闫丽..陕北某露天煤矿矿坑涌水化学特征及灌溉适宜性[J].水文地质工程地质,2025,52(4):98-108,11.基金项目
国家能源集团科技创新项目(GJNY22-134) （GJNY22-134）
煤炭开采水资源保护与利用国家重点实验室开放基金(SHJT-17-42.8) （SHJT-17-42.8）
国家自然科学基金面上项目(42072204) （42072204）
