纳岭沟铀矿床洞穴增渗数值模拟研究  

Numerical simulation of cave permeability enhancement in Nalinggou Uranium Deposit

作　　者：刘双民 刘正邦[1] 李宏星[1] 李召坤 赵利信 翁海成 胥国龙[1] LIU Shuangmin;LIU Zhengbang;LI Hongxing;LI Zhaokun;ZHAO Lixin;WENG Haicheng;XU Guolong(Beijing Research Institute of Chemical Engineering Metallurgy,Beijing 101149,China)

机构地区：[1]核工业北京化工冶金研究院,北京101149

出　　处：《中国矿业》2022年第7期156-162,共7页China Mining Magazine

摘　　要：天然铀是保障我国核电发展和国防安全的重要战略资源,为满足国内日益紧迫的铀资源需求,解决制约低渗透砂岩型铀矿床原地浸出的技术瓶颈,本文提出了洞穴增渗的技术方法,并研究了其在低渗透砂岩铀矿中的适用性。依托纳岭沟砂岩铀矿床,基于渗流理论、岩石力学理论构建了洞穴增渗作业数学模型,采用COMSOL软件对不同作业方式、作业次数下洞穴增渗形成的洞穴形态大小和渗透性改善情况进行了数值模拟研究。研究结果表明:连续作业方式效果优于恒定压力场作业方式,渗透性改善带主要发生在高压分布带控制范围内,10次洞穴增渗作业后渗透性改善带半径达20 m左右,钻孔附近渗透性改善倍数可达10~20倍。研究成果说明,洞穴增渗技术在低渗透砂岩铀矿层中具有较好的效果,适用于提高我国低渗透砂岩铀矿床渗透性。Natural uranium is an important strategic resource to ensure the development of nuclear power and national security in China.To meet the increasingly urgent domestic demand for uranium resources and solve the technical bottleneck restricting in-situ leaching of the low-permeability sandstone-type uranium deposits, a cave permeability enhancement technology is proposed, and its applicability in low-permeability sandstone-type uranium deposits is investigated.Relying on the Nalinggou Uranium Deposit, a mathematical model of cave permeability enhancement operation is constructed based on the theories of seepage and rock mechanics.A numerical simulation study is carried out using COMSOL software for the improvement of cave size and permeability formed by the cave permeability enhancement under different operation methods and times.Results show that the effect of continuous operation is better than that of the constant pressure field operation method.The permeability improvement zone mainly occurred in the control range of the high pressure distribution zone, the radius of the permeability improvement zone is approximately 20 m after 10 times of cave permeability enhancement operations, and the permeability improvement near the borehole can reach 10-20 times.The cave permeability enhancement technology has a better effect in the low-permeability sandstone uranium deposits, and is suitable for improving the permeability of the low-permeability sandstone uranium deposits in China.

关 键 词：低渗透性 洞穴增渗 砂岩型铀矿 多场耦合 地浸开采 

分 类 号：TD868[矿业工程—金属矿开采]