Permeability enhancement and lixiviation test system for low-permeability uranium-bearing sandstone

Abstract

The invention discloses a permeability enhancement and lixiviation test system for low-permeability uranium-bearing sandstone. The test system comprises a water and air supply system, a high- and lowfrequency excitation system, a lixiviation system and a data acquisition system. With the test system adopted, the permeability enhancement and lixiviation, and radon exhalation of the low-permeability uranium-bearing sandstone can be tested under the effects of different vibration frequencies, vibration time, temperature and the inflation pressure of carbon dioxide and oxygen; and the influence of the change of the vibration frequencies, vibration time, temperature and the inflation pressure of the air on the radon exhalation of a particle uranium-bearing material and a bulk uranium-bearing material under the action of vibration can be tested. According to the permeability enhancement and lixiviation test system for low-permeability uranium-bearing sandstone of the invention, ultrasonic waves and sound waves are utilized to vibrate a sample; the porosity of the sandstone can be increased; the flow of a liquid can be accelerated; the contact between the uranium-bearing sandstoneand the liquid is accelerated; the lixiviation rate of uranium is increased; the change of radon content during a vibration lixiviation process is detected; an assessment basis can be provided for environmental pollution caused by radon; and experimental study on a pollution problem caused by the radon exhalation of ground surface uranium-bearing materials during a stacking process under the influence of air pressure, temperature and vibration can be carried out.

Description

technical field [0001] The invention relates to the technical field of in-situ leaching mining of low-permeability uranium-containing sandstone deposits, in particular to a permeation-increasing leaching test system for low-permeability uranium-containing sandstone deposits. Background technique [0002] Nuclear power is obtained by uranium nuclear fission. Uranium nuclear fission releases a lot of energy and does not emit greenhouse gases and other harmful dust. It is a clean energy source. Under the general situation of increasingly serious environmental pollution, all countries in the world are wholeheartedly committed to the development and utilization of nuclear power. In order to ensure a large amount of natural uranium required for the development of nuclear power, uranium mining is very important. [0003] Among my country's proven uranium resource reserves, sandstone-type uranium resources account for about 35%, and low-permeability resources with ore permeability ...

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Problems solved by technology

[0003] Among my country's proven uranium resource reserves, sandstone-type uranium resources account for about 35%, and low-permeability resources with ore permeability less than 0.5m / d account for more than 70% of sandstone-type resources. Low-permeability uranium-containing sandstone has low porosity. There are few passages through which the leaching liquid can pass, the permeability coefficient of physical seepage is small, and the in-situ leaching process parameters are arranged according to the conventional seepage law, the pumping liquid volume is small, the leaching rate is low, and the mining cost is high, which hinders the development of sandstone-type uranium resources. use

[0004] At present, there are few studies on the in-situ leaching mining of low-permeability uranium-bearing sandstone deposits. In the in-situ leaching mining of low-permeability uranium-bearing sandstone deposits, no research has been conducted on the leaching of low-permeability uranium-bearing sandstones. At the same time, the vibration frequency (low frequency vibration, ultrasonic Vibration), vibration time, leaching temperature, and inflation pressure, the research on uranium leaching and radon precipitation in the process of increasing permeability of low-permeability uranium-bearing sandstone is still blank

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