Study On Simulated Dissolution Of Sandstone-Type Uranium Ore In The Fluid Of Gas Seepage

In recent years,many sandstone-type uranium deposits of case study focuses on oil, organic matter reductive effect of uranium, The experimental research of uranium on reducing temperature hydrothermal fluid is almost as gap. Previous research suggests that Dongsheng uranium mineralization temperature is higher than the local normal burial thermal evolution and the occurrence of sandstone uranium deposits in Dongsheng belongs to low temperature hydrothermal type uranium deposits related gas reduction. Compared with domestic known typical interlayer oxidation zone type ,such as Yili and southern Tuha basin, has the obvious difference.According to the 973 project requirements,in order to find out the formation of large uranium of Dongsheng that whether low temperature hydrothermal fluid rich in oil and gas could handing uranium or not.We will use fluid-rock reaction simulation ,namely low temperature hydrothermal fluid reacted with uranium ore,to find out low temperature hydrothermal fluid handling capacity of uranium and its influencing factors. The main simulation experiments:(1)Under the condition of constant pressure 10MPa thermostatic 100℃,conducting sandstone uranium reacted with NaCl-HCl solution and NaCl-HCl solution mixed with methane gas,and repeat experiments partly.(2)Under the condition of constant pressure 1MPa thermostatic 100℃, conducting sandstone uranium reacted with NaCl-HCl solution and NaCl-HCl solution mixed with methane gas,and repeat experiments partly. Aimed at revealing the capacity of methane gas handling U4+ in NaCl-HCl solution.The conclusions at present:(1) In the system of NaCl-HCl mixed with methane gas, the solubility of uranium increased significantly,it shows that NaCl-HCl solution rich in methane gas has strong ability of dissolved handling.(2) Sandstone uranium dissolved in the system of NaCl-HCl-H2O solution with the absence of gas flow is a process of acid consumption.