Study On Chemical Characteristics And Enrichment Of Fluoride Geothermal Water In Xinyi Lianjiang Area

Due to the widespread problem of excessive fluorine content in geothermal water,high-fluorinated geothermal water can endanger human health and cause environmental pollution.Therefore,in order to find out the chemical characteristics of high-fluorinated geothermal water and the enrichment of fluorine in Xinyi Lianjiang area,this study uses hydrogeochemical methods,hydrogen-oxygen stable isotope and geochemical simulation methods,combined with geology and hydrogeology in the study area.Conditions and other data,the chemical characteristics of high-fluorinated geothermal water in the study area,the influencing factors of fluorine in geothermal water,the existence of fluorine in geothermal water and the enrichment process of fluorine.This study provides a scientific background and guiding significance for the rational and effective development of geothermal water resources in Xinyi Lianjiang area.Through research,it is found that the hydrothermal content of geothermal water in the study area is high,up to 19.78mg/L,showing the characteristics of northwest low and southeast high in spatial distribution;the water chemistry type of high-fluorinated geothermal water is mainly HCO₃-Na type,and the high temperature and alkaline water environment is beneficial to fluorine rich.The high content of Ca²⁺ and Mg²⁺ has an inhibitory effect on fluorine.The high-fluorinated hot water shows the characteristics of rich sodium,calcium-depleted magnesium and weak alkaline.The water quality analysis found that the geothermal water in the area is rich in fluorine and silicic acid,indicating that the geothermal water has medical value,and the high fluorine content limits the drinking use of geothermal water.The stable hydrogen and oxygen isotope results indicate that the geothermal water is mainly derived from Atmospheric precipitation is also supplemented by groundwater in the local mountainous area.The circulation path of high-fluorinated hot water is longer.The forms of fluorine in geothermal water in the study area are F^-?CaF₂?NaF?MgF₂,mainly in the form of F^-component;The action of water rock and fluorine minerals is the main source of fluorine in geothermal water.The dissolved precipitation and cation exchange of calcium minerals are the main influencing factors of fluorine enrichment in geothermal water.