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Comprehensive geophysical monitoring of solute transport in leaching solution of the sandstone type uranium deposit |
Ke HE1,2, Jian-Hua LI2, Yuan-Cheng ZHAO1, Wen-Bo WEI1, Gao-Feng YE1, Gang WANG1 |
1. China University of Geosciences,Beijing 100083, China 2. Beijing Research Institute of Chemical Engineering and Metallurgy, Beijing 101149, China |
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Abstract Uranium extraction methods could be divided into conventional uranium mining and in-situ leaching. Conventional mining is suitable for hard rock uranium resources, whereas ISL is usually adopted for sandstone uranium deposits. ISL is a new mining method by injecting specially formulated leaching solution to recover uranium. Concentration gradient distribution range is surely to be formed accompanied by a series of solute transport process during the leaching course. For the range and process above are closely related to coverage area (rate) of orebody, recovery rate of resources and pollution range, control of underground water and some other important problems, a monitoring job for the range and process is essential. Until now, there are no mature methods both in China and abroad and relevant researches are inadequate. A research on leaching solution range and solute transport process was taken by performing a group of tests of CSAMT and TDIP survey in Erlian Basin in the paper. Combined with the data from regional geology, hydrology, formation resistivity, logging, rock polarizability and characteristics of formation resistivity, the authors gave an interpretation and obtained a 2-D resistivity model and a polarization anomaly distribution model of the structure below the wellfield studied. A suite of geophysical monitoring methods for solute transport process of in-situ leaching uranium were made.
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Received: 28 August 2017
Published: 04 June 2018
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岩性 | 钻孔个数 | 变化范围 | 平均值 | 岩性 | 钻孔个数 | 变化范围 | 平均值 | 泥岩 | 33 | 2.25~8.46 | 7.63 | 粗砂岩 | 35 | 22.75~38.69 | 28.62 | 粉砂岩 | 33 | 7.83~14.38 | 12.50 | 砂质砾岩 | 34 | 28.62~44.52 | 33.25 | 细砂岩 | 37 | 12.78~18.69 | 16.72 | 砾岩 | 37 | 29.21~48.26 | 37.52 | 中砂岩 | 35 | 17.69~27.81 | 22.81 | | | | |
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地层 | ρ/(Ω·m) | 主要岩性 | | 3~30 | 黄土、黏土 | 第四系(Q) | 0.2~5 | 碱、盐、淤泥 | | 100~300 | 干砂、砾石 | | 30~60 | 湿砂 | 新近系(N) | 5~100 | 砂砾岩、泥岩、砾石以石英为主,次为火山碎屑岩 | 上白垩统(K2) | 6~15 | 砂泥、砂砾岩互层 | 下白垩统赛汗塔拉组(K1s) | 6~35 | 砂砾石、含砾砂岩夹泥岩夹煤层 | 下白垩统腾格尔组(K1t) | 2~12 | 泥岩、粉砂岩 | 下白垩统阿尔善组(K1a) | 5~58 | 上部为砂砾岩、含砾砂岩、夹泥岩,中部为泥岩、泥质砂岩,下部为巨厚的砂砾岩 | 上侏罗统(J3) | 50~300 | 火山碎屑岩、火山熔岩 | 中下侏罗统(J1-2) | 80~500 | 砂岩、泥岩、炭质页岩 |
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岩石名称 | 块数 | 变化范围 | 平均值 | 安山岩 | 32 | 0.18~3.78 | 1.56 | 板岩 | 11 | 0.31~6.11 | 2.96 | 变质砂岩 | 18 | 0.11~4.44 | 1.65 | 粗面岩 | 2 | 0.13~3.63 | 1.88 | 二长花岗岩 | 22 | 0.39~2.73 | 1.32 | 砂岩 | 12 | 0.39~6.18 | 1.52 | 绢云片岩 | 4 | 0.40~1.13 | 0.67 | 砾岩 | 1 | 0.36 | 0.36 | 玄武岩 | 10 | 1.11~3.85 | 2.09 | 石英斑岩 | 1 | 1.84 | 1.84 | 闪长岩 | 9 | 0.34~3.80 | 1.15 | 流纹岩 | 30 | 0.21~2.85 | 1.55 | 凝灰岩 | 23 | 0.12~3.47 | 1.00 | 英安岩 | 12 | 1.54~3.31 | 2.43 | 花岗岩 | 12 | 0.85~3.17 | 1.09 | 辉绿岩 | 10 | 3.21~5.02 | 4.39 |
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