摘要
溶矿技术通过将储卤层中蒸发盐矿物转化为液态卤水,有效实现了盐湖资源的可持续开发,缓解因过量开采导致的地下水位持续下降及资源贫化问题。然而在补水溶矿过程中,多场耦合作用形成了复杂的水-岩反应体系,其动态演化过程的定量表征成为亟待解决的关键问题。本研究开发基于PHT3D的卤水反应运移数值模型,系统整合了渗流、溶质运移和矿物反应动力学过程。研究发现,在一维溶矿模型中,0.5 m^(3)储卤层经1.2天动态平衡后,光卤石溶解量达到0.24 mol;水动力场控制下溶矿过程呈现五阶段演化特征,各矿物相溶解动力学及离子浓度场具有显著差异性响应规律。察尔汗盐湖示范区二维模型结果表明,2021年8月至2022年8月间光卤石固液转化效率达20.07%。研究成果为优化盐湖液态矿产开发方案、提升资源利用率及可持续开发提供了科学依据和技术支撑。
Solution mining technology converts evaporite minerals in brine reservoir layers into liquid brine,thereby enabling the sustainable development of Salt Lake resources and mitigating issues such as the continual decline of groundwater levels and resource impoverishment caused by excessive exploitation.However,during the water-supplemented solution mining process,the coupling of multiple fields creates a complex water-rock reaction system,and quantitatively characterizing its dynamic evolution remains a critical challenge.In this study,we developed a brine reactive transport numerical model based on PHT3D that systematically integrates seepage,solute transport,and mineral reaction kinetics.The results indicate that,in a one-dimensional solution mining model,a 0.5 m^(3) brine reservoir reaches dynamic equilibrium after 1.2 days,with a halite dissolution amount of 0.24 mol.Under the control of the hydrodynamic field,the solution mining process exhibits a five-stage evolution,and the dissolution kinetics of various mineral phases as well as the ion concentration fields respond with significant differences.Furthermore,two-dimensional model results from the Qarhan Salt Lake demonstration area reveal that from August 2021 to August 2022,the solid-liquid conversion efficiency of halite reached 20.07%.These findings provide a scientific basis and technical support for optimizing Salt Lake liquid development schemes,enhancing resource utilization and promoting sustainable development.
作者
王建萍
岳超
余冬梅
凌智永
汪子涛
WANG Jianping;YUE Chao;YU Dongmei;LING Zhiyong;WANG Zitao(Key Laboratory of Green and High-end Utilization of Salt Lake Resources,Qinghai Institute of Salt Lakes,Chinese Academy of Sciences,Xining,810008,China;Qinghai Provincial Key Laboratory of Geology and Environment of Salt Lakes,Xining,810008,China;University of Chinese Academy of Sciences,Beijing,100049,China;School of Earth and Environment,Anhui University of Science and Technology,Huainan,232001,China)
出处
《盐湖研究》
2025年第6期11-19,共9页
Journal of Salt Lake Research
基金
青海省自然科学基金团队项目(2022-ZJ-903)
中信十大科技创新项目盐湖资源综合开发与利用(2023ZXKYA05100)
国家自然科学基金项目(U24A20598)。
关键词
盐湖卤水
反应运移建模
固液转换
PHT3D
Salt lake brine
Reactive transport modeling
Solid-Liquid conversion
PHT3D
