Simulation test device and method for pollutant migration after cracking of in-situ leaching uranium mining water-resisting layer based on CO2 and O2

The invention relates to the technical field of uranium mining, and discloses a CO2 and O2-based simulation test device and method for pollutant migration after in-situ leaching uranium mining water-resisting layer cracking, and the CO2 and O2-based simulation test device comprises a gas supply unit, a leaching liquid preparation unit, a T-shaped core holder and a solution collection unit. The device can simulate the influence on in-situ leaching uranium mining after the in-situ leaching uranium mining water-resisting layer is cracked and the pollutant migration process in the crack-containing water-resisting layer in the coordinated mining process of uranium and the coal seam under uranium, and research the evolution rules of the sandstone uranium ore pore structure, permeability, uranium ore leaching and the like in the process; the water-resisting layer crack evolution process and the pollutant migration rule are determined. Meanwhile, the sandstone uranium ore leaching process and the migration rule of po