Coal type uranium ore deposit well-free type fluidized mining method

Abstract

The invention discloses a coal type uranium ore deposit well-free type fluidized mining method. The coal type uranium ore deposit well-free type fluidized mining method comprises the steps of coal type uranium ore deposit underground gasification, in-situ leaching of uranium-bearing ash residue and environmental modification of a combustion cavity. The coal type uranium ore deposit underground gasification is carried out by adopting an existing technical scheme; according to the in-situ leaching of uranium-bearing ash residue, uranium in the ash residue generated in underground gasification ofS1 is leached by injecting a steep solution; and according to the environmental modification of the combustion cavity, the steep solution and hazardous substances remained in a combustion area are dissolved and discharged when leaching is completed, and until the content of the related hazardous substances in a discharged water body reduces to a background value or meets related regulation requirements. According to the coal type uranium ore deposit well-free type fluidized mining method, a coal type uranium ore deposit is touched through surface drilling, borehole operation is not required by personnel, in-situ fluidized mining of solid ore deposits such as coal and the uranium is realized through a chemical method, the technological process and production period can be effectively shortened, the recovery rate of the coal and uranium resources is improved, the ore deposit mining accident rate, underground water pollution risk and construction cost are reduced.

Description

technical field [0001] The invention relates to the technical field of fluidized mining of solid ore deposits, in particular to a shaftless fluidized mining method for coal-type uranium deposits. Background technique [0002] At present, the known mining method of coal-type uranium deposits is underground or open pit mining of coal-type uranium ore, which is then crushed and burned for power generation, heat supply and uranium metal extraction. However, judging from the geological conditions of coal-type uranium deposits that have been mined and explored in my country, the geological conditions of coal-type uranium deposits are complex, and mining, dressing and smelting are difficult. The main manifestations are: the roof is mostly muddy cemented, highly permeable sandstone, with a high water content, and roof caving is prone to occur during the excavation and mining process; generally, the sulfur content is high, and the spontaneous combustion period is short, mostly 1-3 m...

AI Technical Summary

Problems solved by technology

However, judging from the geological conditions of coal-type uranium deposits that have been mined and explored in my country, the geological conditions of coal-type uranium deposits are complex, and mining, dressing, and smelting are difficult

The main manifestations are: the roof is mostly muddy cemented, highly permeable sandstone, with a high water content, and roof caving is prone to occur during the excavation and mining process; generally, the sulfur content is high, and the spontaneous combustion period is short, mostly 1-3 months, and rich in gas, the ore body is radioactive, and the risk of manual mining is high; the shape of the ore body is complex, such as lenticular, nest, and chicken nest, and the branches and composites are irregular, so it is difficult to choose mining technology; the coal seam Most of them are Jurassic lignite with low mining value; the ore needs to be transported to different places for crushing, burning and refining, which increases transportation costs and may cause a series of environmental pollution problems during the period

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