锑矿废石堆场淋滤作用下重金属元素化学动力学过程及时空分布

针对锑矿废石堆场淋滤作用下重金属元素化学动力学过程及时空分布不明确，导致堆场淋滤重金属污染流对地下水重金属污染难评测、防控等问题；本项目以湖南锡矿山锑矿废石堆场为研究区，将降雨-锑矿废石堆场-下部包气带作为整体系统，拟研究：1）降雨淋滤下锑矿废石-雨水界面重金属释放影响因素及规律，构建多场耦合下废石堆场重金属释放耦合动力学模型，揭示其释放动力学过程特征及动态规律；2）包气带土壤吸附-解吸重金属动力学特征及重金属包气带空间运移动力学过程影响因素，建立土壤吸附-解吸重金属动力学方程，揭示废石堆场淋滤重金属污染流中重金属包气带空间运移过程影响机制及规律；3）构建基于Hydrus平台的重金属包气带空间运移过程三维耦合水动力学模型，预测废石堆场淋滤重金属污染流中重金属包气带空间运移过程时空分布。旨为锑矿废石堆场淋滤重金属污染流评测与防治、地下水重金属污染源头防控等提供理论基础和科学依据。

The chemical Kinetics and time distribution of heavy metal elements are not clear in the leaching process of waste rock of Sb ore. This project takes the waste rock dump site of Sb mine in Hunan tin mine as the research area, and regards the waste rock dump site of Sb mine and the lower gas belt of Sb mine as the whole system. The coupling dynamics model of heavy metals released by leaching under multi-field coupling is constructed. 2) Dynamic characteristics of heavy metal adsorption and desorption in the soil of the gas belt and factors affecting the spatial transport dynamics of the heavy metal gas belt, and the establishment of soil adsorption and desorption of heavy metal dynamics equations, to reveal the mechanism and laws affecting the spatial transport process of heavy metal gas in the heavy metal pollution flow in the waste rock yard; 3) Constructing a three-dimensional coupled hydrodynamic model based on the Hydrus platform for the spatial migration of heavy metal gas belts, and predicting the spatiotemporal dynamics and distribution trends of the spatial migration of heavy metal gas belts during leaching and filtration of heavy metal pollution streams in waste rock piles. The purpose is to provide theoretical basis and scientific basis for the evaluation and prevention of heavy metal pollution flow and the prevention and control of the source of heavy metal pollution in groundwater.transport dynamics and influence mechanism of heavy metal gas belt in the pollution flow of leaching heavy metals(3) to construct a three-dimensional coupled hydrodynamic model of the spatial transport process of heavy metal gas belt based on the Hydrus platform. The spatiotemporal dynamics and distribution trend of the spatial transport dynamics of heavy metal inclusion gas in the leaching heavy metal pollution flow are predicted. The purpose is to provide theoretical and scientific basis for the evaluation and prevention of heavy metal pollution flow in the landfill and to establish a system for controlling heavy metal pollution in groundwater.