Application of Eichrom Sr Resin to the Separation and Enrichment of Lead and Strontium in Uranium Ore Concentrates
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摘要: 铀矿浓缩物的溯源研究在核法证学中具有重要地位，通过测量其中的铅、锶同位素丰度比能为溯源提供部分地理指示信息。对铀矿浓缩物中铅、锶同位素的精准测量主要受制于大量铀与微量铅、锶的分离、富集。本文利用Eichrom Sr树脂对铅、锶的特效吸附性，通过正交试验对影响铅、锶回收率的主要因素（淋洗酸度、流速、体积）进行了优化，确定了最佳淋洗条件；进而利用UTEVA树脂对铀的特效吸附性，与Eichrom Sr树脂联用，实现了铀矿浓缩物中大量铀与微量铅、锶的分离，有效降低了因铅、锶洗脱液中铀含量过高而引起的基体效应。实验结果表明：铅、锶回收率均>90%，铅、锶洗脱液中的铀含量低于500ng，优于文献报道值（48.8μg）。利用该方法对实际铀矿浓缩物样品进行测量，分析结果显示铅、锶同位素丰度比可以作为铀矿浓缩物的地理溯源判据，为今后建立铀矿浓缩物中铅、锶同位素数据库提供技术支持。
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关键词:
- Eichrom Sr树脂 /
- 铀矿浓缩物 /
- 铅 /
- 锶 /
- 基体效应
Abstract:BACKGROUNDThe traceability study of uranium ore concentrates plays an important role in nuclear forensics. By measuring the abundance ratios of lead and stontium isotopes, the results can provide some geographical indication information for traceability. OBJECTIVESTo achieve the separation of large amounts of uranium from trace lead and strontium and to establish a set of methods for separating lead and strontium from uranium ore concentrate, while providing technical support for the establishment of a lead and strontium isotopes database in uranium ore concentrate. METHODSBased on Eichrom Sr resin's adsorption properties for lead and strontium, the main factors (acidity, current velocity and volume) affecting the recovery of lead and strontium were optimized by orthogonal testing. The best washing conditions have been determined. The combination of UTEVA resin and Eichrom Sr resin can effectively reduce uranium content in lead and strontium eluent and thus reduce the matrix effect. RESULTSThe results show that the recovery of lead and strontium is more than 90% and the uranium content in lead and strontium eluent is less than 500ng, an improvement on the reported value of 48.8μg. CONCLUSIONSThe actual uranium ore concentrate samples were measured by this method. The results show that the lead and strontium isotope abundance ratios can be used as the geographical traceability criteria for uranium ore concentrates, providing a technique for the future establishment of lead and strontium isotope databases for uranium ore concentrates. -
Key words:
- Eichrom Sr resin /
- uranium ore concentrates /
- lead /
- strontium /
- matrix effect
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表 1 Eichrom Sr树脂柱上Pb、Sr分配比
Table 1. Distribution ratio of Pb and Sr on Eichrom Sr resin
实验序号 硝酸酸度(mol/L) Pb/K Sr/K 1 1 1063 83 2 2 1277 96 3 3 1253 96 4 4 889 99 5 5 726 100 6 6 578 100 注：K=树脂相含量/液相含量。 
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表 2 Pb、Sr正交试验
Table 2. Orthogonal tests of Pb and Sr
水平 因素A 因素B 因素C Sr淋洗酸度
(硝酸，mol/L)Pb淋洗酸度
(盐酸，moL/L)淋洗流速
(mL/min)淋洗体积
(mL)1 0.01 6 1 2 2 0.05 7 0.5 3 3 0.1 8 0.2 4
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表 3 不同酸度、流速和体积条件下Sr的正交试验结果
Table 3. Orthogonal test results of Sr in various acidity, current velocity and volume
实验序号 影响因素 Sr回收率(%) A
(mol/L)B
(mL/min)C
(mL)组1 组2 组3 平均值 1 0.01 1 2 68.1 72.4 72.2 70.9 2 0.01 0.5 3 79.9 78.5 82.1 80.2 3 0.01 0.2 4 92.9 94.7 92.1 93.2 4 0.05 1 3 75.1 78.8 76.2 76.7 5 0.05 0.5 4 86.5 88.8 86.2 87.2 6 0.05 0.2 2 69.5 70.8 69.5 69.9 7 0.1 1 4 83.2 82.3 79.8 81.8 8 0.1 0.5 2 65.7 67.6 63.8 65.7 9 0.1 0.2 3 89.8 86.9 88.5 88.4 T1 732.9 688.1 619.6 T2 701.4 699.1 735.8 T3 707.6 754.7 786.5 x1 81.4 76.5 68.8 x2 77.9 77.7 81.8 x3 78.6 83.9 87.4 R 3.5 7.4 18.5 注：Ti代表各因素相同水平实验结果之和，同一因素下，T值越大表明该水平对结果影响的贡献越大；R代表极差，即各水平最大与最小平均值之差，其大小反映了各个因素对结果的影响，R值越大，表明该因素对结果的影响越大；xi代表实验结果的平均值。
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表 4 不同酸度、流速和体积条件下Pb的正交试验结果
Table 4. Orthogonal test results of Pb in various acidity, current velocity and volume
实验序号 影响因素 Pb回收率(%) A
(mol/L)B
(mL/min)C
(mL)组1 组2 组3 平均值 1 6 1 2 58.2 61.5 58.9 59.5 2 6 0.5 3 63.6 66.1 64.5 64.7 3 6 0.2 4 71.7 69.1 72.9 71.2 4 7 1 3 75.3 76 74.5 75.3 5 7 0.5 4 80.3 81.4 79.3 80.3 6 7 0.2 2 76.6 78.1 77.7 77.5 7 8 1 4 80.1 82.8 81.6 81.5 8 8 0.5 2 81.4 82.6 82.7 82.2 9 8 0.2 3 93.5 92.8 92.4 92.9 T1 586.5 648.9 657.7 T2 699.2 681.9 698.7 T3 769.9 724.8 699.2 x1 65.2 72.1 73.1 x2 77.7 75.8 77.6 x3 85.5 80.5 77.7 R 20.4 8.4 4.6
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表 5 实际铀矿浓缩物样品中Pb、Sr同位素丰度比
Table 5. Isotope abundance ratio of Pb and Sr in actual uranium ore concentrate sample
样品编号 208Pb/204Pb 207Pb/204Pb 206Pb/204Pb 87Sr/86Sr X1 39.16 17.09 46.53 0.71683 X2 39.18 17.02 46.84 0.71685 X3 39.09 16.92 46.34 0.71683 X4 39.92 17.06 46.87 0.71693 平均值 39.34 17.02 46.64 0.71686 RSD(%) 0.3 0.4 0.6 0.007 Y1 38.207 15.596 18.019 0.71892 Y2 38.219 15.613 17.968 0.71903 Y3 38.181 15.628 18.022 0.71888 Y4 38.247 15.624 18.011 0.71890 平均值 38.214 15.615 18.005 0.71893 RSD(%) 0.07 0.09 0.14 0.010
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