铀矿石及含铀岩石中铀(Ⅵ)和总铀的关系探讨
Experimental Study on the Relationship between Uranium(Ⅵ) and Total Uranium in Uranium Ores and Uranium-bearing Rocks
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摘要: 探讨了溶矿时间和溶矿温度对测量铀矿石及含铀岩石中铀(Ⅵ)和铀(Ⅳ)的影响及高含量铀(铀含量≥100 μg/g)和低含量铀(铀含量≤100 μg/g)中铀(Ⅵ)和总铀的关系。结果表明,溶矿3 h、溶矿温度65℃可以有效检测铀矿石及含铀岩石中的铀(Ⅵ)和铀(Ⅳ)。高含量样品,总铀含量等于铀(Ⅵ)和铀(Ⅳ)之和;低含量样品,铀(Ⅵ)的含量在数值上和总铀符合数学关系:w =(A560/A584)×w(U总)。 通过测定不同波长下的总铀含量,应用数学关系导出低含量样品中铀(Ⅵ)和铀(Ⅳ)的含量,可以大大简化分析步骤,提高分析效率,经济便捷。Abstract: The effect of sample digestion time and temperature on the determination of U(Ⅵ) and U(Ⅳ) in uranium ores and uranium-bearing rocks was carried out. And the relationship between U(Ⅵ) and total uranium in samples with both high (≥100 μg/g) and low (≤100 μg/g) contents of uranium was also discussed. The results indicate that U(Ⅵ) and U(Ⅳ) can be extracted and determined effectively under digestion temperature of 65℃ in 3 hours. The content of total uranium equals to the sum of U(Ⅵ) and U(Ⅳ) for the samples with high uranium content (≥100 μg/g). However, the content of U(Ⅵ) can be expressed as an equation of w =(A560/A584)×w(Utotal) for the samples with low uranium content (≤100 μg/g), which can be used to calculate the contents of U(Ⅵ) and U(Ⅳ) in the samples when total content of uranium is obtained by the determination at different wavelengths, which greatly simplifies the analysis procedure and improves the analysis efficiency.
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Key words:
- uranium /
- ore /
- uranium-bearing /
- rock /
- uranium(Ⅵ)
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