Method for blasting seepage enhancement for low infiltration sandrock -type uranium deposit

Abstract

The invention discloses a method for explosion and leakage increase of a low permeability sandstone uranium deposit, which includes steps as follows: A. blast holes are drilled through the overburden, the top rock of occurrence terrane to the proper position of the occurrence terrane from surface. An underreamer is used to locally ream the blast holes at the occurrence terrane to meet charging requirement; B. blasting cartridges are arranged in the blast holes in an uncoupling way; the detonator is waterproof; uncoupling charge for explosion comprises radial uncoupling charge and axial uncoupling charge; C. after the blasting cartridges are arranged properly, hole seal measures shall be taken to build up the blast holes; D. the blasting cartridges are initiated through short delay blasting which comprises short delay blasting inside the blast holes and short delay blasting between the blast holes. The recovery factor and the yield per unit of in-situ Uranium leaching are improved; the uranium deposit resource of low permeability sandstone type is used completely, thus alleviating the shortages of uranium resources.

Description

technical field [0001] The present invention relates to the field of improving the permeability of low-permeable ore-hosting rock formations, and more specifically relates to a method for blasting and increasing permeability of low-permeable sandstone-type uranium ore deposits. gold, copper, silver, molybdenum, etc.) to improve the permeability of its ore-hosting rock formations. Background technique [0002] Nuclear energy is a safe, clean and reliable energy source. At present, China's nuclear energy utilization is developing rapidly. The "Nuclear Power Medium and Long-term Development Plan (2005-2020)" proposes that the installed capacity of nuclear power operation will increase from the current 7 million kilowatts to 40 million kilowatts by 2020. This will inevitably lead to a substantial increase in the demand for uranium resources. In order to adapt to the rapid development of nuclear energy utilization, ensuring the supply of uranium resources and increasing uranium...

AI Technical Summary

Problems solved by technology

Too small or too large permeability of the ore layer is not conducive to in-situ leaching mining, too small is not conducive to the migration of the leaching solution in the rock formation, and too large is not conducive to the full reaction between the leaching solution and uranium minerals. Several obvious radial cracks are formed in the ore seam, which makes the leaching liquid easy to form a dominant flow, and the leaching agent cannot fully and comprehensively dissolve the ore, and the purpose of leaching cannot be achieved

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