Method for replacing and repairing underground water of in-situ leaching uranium mining base by adopting sewage pumping and clean water injection

Abstract

The invention provides a method for replacing and repairing underground water of an in-situ leaching uranium mining base by adopting sewage pumping and clean water injection, and belongs to the technical field of underground water treatment. The method comprises the following steps that clean water is injected into surrounding liquid injection holes while underground water is pumped out of liquid pumping holes of the in-situ leaching uranium mining base; and according to the method, the underground water is repaired by adopting a pollution-pumping, clean-water-injection and replacement repair technology, a specific liquid pumping hole is selected to pump out polluted water, and a liquid injection hole is selected to inject clean water to replace the polluted water with the clean water, so that the radionuclide natural uranium, radium-226 and non-radioactive pollutant concentration of the underground water of the in-situ leaching well site reach a repair target value.

Description

technical field [0001] The invention relates to the technical field of groundwater treatment, in particular to a method for replacing and repairing groundwater in an in-situ leaching uranium mining base by using sewage pumping and clearing injection. Background technique [0002] In 1959, the 381 deposit was discovered by the 209 Geological Brigade affiliated to the Southwest Geological Bureau of the Pronuclear Industry; after decades of development, a major breakthrough was made in the acid leaching uranium test. After expanded tests and industrial tests, 381 became a my country's first in-situ leaching uranium test base. However, the main environmental problem caused by acid in-situ leaching is that the groundwater in some areas of the 38-1 mine section of the 381 mining area is polluted to a certain extent. [0003] Since 2010, all 381 acid in-situ leaching tests have been stopped, but in order to prevent the further spread of groundwater pollutants, the pumping and treat...

AI Technical Summary

Problems solved by technology

However, the main environmental problem caused by acid in-situ leaching is that the groundwater in some areas of the 38-1 mine section of the 381 mining area is polluted to a certain extent.

[0003] Since 2010, all 381 acid in-situ leaching tests have been stopped, but in order to prevent the further spread of groundwater pollutants, the pumping and treatment of groundwater at the well site has been maintained, and it has also effectively prevented local residents from entering the polluted area for farming operations, but There are still problems in the decommissioning and treatment of the legacy uranium mining and metallurgy radioactive facilities and radioactive waste pollution in this area, that is, the concentration of radionuclide natural uranium and radium-226 in the groundwater of the in-situ leaching well site is higher than the natural concentration of the surrounding ore-bearing water layer, which is extremely high. The concentration of radioactive pollutants exceeds the category IV in the "Groundwater Quality Standard" (GB / T14848-1993)

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