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<p>The effect of conventional factors on the free radon production rate above 0&#xa0;°C has been widely studied, but rarely explored under frozen conditions. In order to investigate the effect on the free radon production rate of uranium tailings under frozen and non-frozen conditions, uranium tailings from southern China were selected for screening, and temperature, water–solid mass ratio and particle size were used as influencing factors for research. The stable radon concentration and the free radon production rate of uranium tailings of varying particle sizes at different temperatures (20&#xa0;°C, 0&#xa0;°C, − 10&#xa0;°C, − 20&#xa0;°C) and different water–solid mass ratios (0, 0.14, 0.28) were measured by the homemade radon collection tanks. The experimental results showed that: (1) The free radon production rate decreases with temperature decreases, more significantly under frozen conditions, dropping 3.49–4.16% per 1&#xa0;°C on average. (2) Under non-frozen conditions, the free radon production rate rises with water–solid mass ratio rises, while under frozen conditions, the free radon production rate of uranium tailings first increases and then decreases with the increase of water–solid mass ratio. (3) The larger particle size, the lower the free radon production rate. The free radon production rate of uranium tailings with particle size &gt; 450 μm is 21.3–81.1% lower than that of uranium tailings with other particle sizes.</p>

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Free radon production from uranium tailings under frozen and non-frozen conditions

  • 期刊论文

  • 发表日期：

    2025年1月6日

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  • Yongjun Ye,
  • Yifan Zong,
  • Mengyi Li,
  • Bangzhi Song

摘要

The effect of conventional factors on the free radon production rate above 0 °C has been widely studied, but rarely explored under frozen conditions. In order to investigate the effect on the free radon production rate of uranium tailings under frozen and non-frozen conditions, uranium tailings from southern China were selected for screening, and temperature, water–solid mass ratio and particle size were used as influencing factors for research. The stable radon concentration and the free radon production rate of uranium tailings of varying particle sizes at different temperatures (20 °C, 0 °C, − 10 °C, − 20 °C) and different water–solid mass ratios (0, 0.14, 0.28) were measured by the homemade radon collection tanks. The experimental results showed that: (1) The free radon production rate decreases with temperature decreases, more significantly under frozen conditions, dropping 3.49–4.16% per 1 °C on average. (2) Under non-frozen conditions, the free radon production rate rises with water–solid mass ratio rises, while under frozen conditions, the free radon production rate of uranium tailings first increases and then decreases with the increase of water–solid mass ratio. (3) The larger particle size, the lower the free radon production rate. The free radon production rate of uranium tailings with particle size > 450 μm is 21.3–81.1% lower than that of uranium tailings with other particle sizes.