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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0.02~0.06 m/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。
Studying the variation law of permeability coefficient of saturated and unsaturated state of low-permeability uranium ore can provide basis for the determination of in-situ leaching technology. A sample of a sandstone from a uranium mine in Xinjiang was selected, and the experimental device for measuring the permeability of the ore was developed. The experimental study on the infiltration of natural ore samples was carried out. The results show that the sandstone-type uranium deposit belongs to the low-permeability deposit and the permeability coefficient is between 0.02 and 0.06 m / d. The seepage process of the low permeability uranium ore rock can be divided into two stages of saturation and non-saturation. The coefficient increases with the increase of head pressure, and then increases at a lower rate and finally increases at the whole. The permeability coefficient in the saturation stage is approximately a constant.