低渗透砂岩铀矿岩饱和与非饱和过程渗透变化规律的实验研究

Experimental Study on Permeability Variation Law of Low Permeable Sandstone Uranium Ore Rock Seepage in Saturation and Unsaturation Process

研究低渗透性铀矿岩饱和与非饱和状态的渗透系数变化规律，可为地浸工艺的确定提供依据。选取新疆某铀矿山砂岩样品，用自制的渗透系数测定实验装置．开展了天然矿岩原样的渗透规律的实验研究。研究表明，该砂岩铀矿床属于低渗透性矿床，渗透系数在0．02～0．06m／d之间；低渗透性铀矿岩的渗流过程可以分为饱和和非饱和两个阶段．其中非饱和阶段渗透系数随水头压差的增大而增大．之后其增大速率变小，最终又整体增大；而饱和阶段的渗透系数近似一个常数。

The study on the variation law of permeability coeffi- cient of low permeable sandstone uranium ore rock in two proces- ses of saturation and unsaturation can provide the basis for deter- mining in-situ leaching process. Experimental research on per- meability law of natural sandstone uranium ore rock from a urani- um mine in Xinjiang province was carried out by a homemade permeability test device. The research indicated that the sand- stone uranium deposits may be classified as low permeable one because the permeability coefficient ranges between 0.02 m/d and 0.06 m/d.The seepage process of low permeable sandstone uranium ore rock can be divided into two phases of saturation and unsaturation.In the unsaturation seepage phase,with the wa- ter head drop increasing the permeability coefficient increases and then the increasing rate of permeability coefficient decrea- ses, finally the permeability coefficient overall increases, while the permeability coefficient is a constant approximately in the saturation seepage phase.