Decontamination method and apparatus for solid-state material contaminated by radiocesium
一种固体状、去污染的技术,应用在去污染领域,能够解决未发现有效解决方案等问题,达到降低放射性浓度的效果
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Embodiment 1
[0082] Decontamination treatment with ammonium bifluoride + (sulfuric acid + KCl) in soil samples dried at 60 °C.
[0083] A soil sample (sample 1) in an amount of 3 g dried at 60°C was dispersed in 100 mL of 10 g / L ammonium bifluoride solution, and placed in an ultrasonic cleaner VS-100III produced by AS ONE Company, and dispersed for 30 minutes at a frequency of 28 kHz . The resultant was washed twice in ion-exchanged water, and subjected to suction filtration after centrifugation.
[0084] Next, the sample on the GF / B filter was dispersed in 100 mL of a mixed solution of 1 mol / L sulfuric acid and 20 g / L-KCl, and then placed in an ultrasonic cleaner to disperse at a frequency of 28 kHz for 30 minutes. The resultant was subjected to suction filtration and then dried in a desiccator at 105° C. for 1 hour to measure the radioactive dose. The results are shown in Table 1.
[0085] [Table 1] Decontamination test results of soil dried at 60°C by preliminary treatment with ammon...
Embodiment 2-3
[0093] The test was carried out using conditions similar to those of Example 1, except that the treatment time was extended to 60 minutes and 120 minutes using ammonium bifluoride. The results are shown in Table 3.
[0094] [Table 3] Decontamination test results of soil dried at 60°C using ammonium bifluoride + (sulfuric acid + KCl) 2
[0095]
[0096] Examples 1-3 show that the extension of the treatment time with ammonium bifluoride increases the removal ratio of radioactive cesium from the 70% level to the 80% level.
Embodiment 4
[0098] The test was carried out using conditions similar to those of Example 2 except that the treatment liquid 1 containing ammonium bifluoride and KCl was used. The results are shown in Table 4.
[0099] [Table 4] Decontamination test results of (ammonium bifluoride+KCl)+(sulfuric acid+KCl) on soil dried at 60°C
[0100]
[0101] There is no significant difference with the result of Example 2.
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