低渗透砂岩型铀矿床增渗方法及其可行性研究

Study of enhanced permeability methods and their feasibility in low-permeability sandstone-type uranium deposit

为满足国内核电快速发展对铀资源的大量需求,解决制约低渗透砂岩型铀矿床原地浸出顺利生产的瓶颈,借鉴在油气田增产、煤气开采及瓦斯治理等方面提高岩体渗透性方法的成功经验,分析这些方法在原地浸出开采中应用的不足,提出了适用于低渗透砂岩型铀矿床原地浸出生产的无临空面深层岩体爆破增渗方法,以提高低渗透赋矿岩层的渗透性。通过初步爆破增渗模型试验,验证了无临空面深层岩体爆破增渗方法的可行性。

In order to meet heavy demand of uranium resources due to rapid development of nuclear power in China and solve the problem of low permeability of the ores in in-situ leach uranium mining from low-permeability sandstone-type uranium deposits, this paper borrows ideas from successful experience of enhanced rock mass permeability methods that have been successful applied to oil, gas, CBM exploration and coal gas control, and analyzes the deficiencies of these methods in case that they were used in in-situ leach uranium mining, and then proposes the method of blasting enhanced permeability of no free surface deep rock mass（abbreviated to BEPDR） to increase the permeability of the ores with low permeability. The implementation of preliminary model tests of BEPDR verifies the feasibility of this method.