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Method for removing 226Ra in uranium tail sand and radioactive contaminated soil by plants

A tailings and soil technology, applied in the field of phytoremediation of radioactive contamination, can solve problems such as inability to transport, achieve the effects of reducing dust, developing root systems, and considerable potential economic benefits

Active Publication Date: 2012-07-11
NANHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most plants are 226 Ra has no enrichment effect, although it has been reported that very few plants have 226 Ra has an enrichment effect, but these plants can only 226 Ra accumulates in its roots and cannot be transported to its aerial parts

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach

[0032] A method of using plants to remove uranium tailings and radioactively contaminated soil 226 method of Ra, it will 226 The Ra enrichment plant --- Pieris multifida seedlings are planted in uranium tailings and radioactively contaminated soil, and the steps to make them survive, grow, harvest and carry out centralized treatment are:

[0033] (1) Spore germination and cultivation: the mature spores of the spores are evenly sown on the spore culture medium or the autoclaved mulch, and placed in a constant temperature incubator at a temperature of 20°C and a humidity of 85°C. %, cultured for 7-9d until the spores germinated.

[0034] (2) Pot planting treatment: 5-7 days after the spores germinate, the seedlings are planted in flowerpots, and the temperature is 18-20° C., and the humidity is 70%-85% for cultivation.

[0035] (3) Transplanting into uranium tailings and radioactively contaminated soil: when the potted seedling age reaches 20-25 days, transplant the seedlings ...

Embodiment 1

[0038] Example 1, in February every year, the mature spores of Limegrass are evenly sown on the solid agar medium, placed in a constant temperature incubator, and cultivated for 7-9 days at a temperature of 20°C and a humidity of 85%. until the spores germinate. After the spores have germinated for 5-7 days, the seedlings are cultivated in flowerpots, and cultivated under the condition that the temperature is 18-20° C. and the humidity is 70%-85%. When the potted seedling age reaches 20-25d, the seedlings are transplanted to 226 The Ra content is 8350Bq / kg in the uranium tailings, the planting row spacing is 12cm, the plant spacing is 10cm, the aboveground part is harvested after 90 days, and the aboveground stems of 3-5cm are left as foundation stubble. 1m 2 The average biomass of the aboveground part in the planting area is 1050g dry ash weight, of which the leaves are 900g and the stems are 150g. Ye Zhong 226 The average content of Ra is 150.6Bq / g, the stem 226 The ave...

Embodiment 2

[0039] Example 2, in February every year, the mature spores of sagegrass are evenly sown on the high-pressure sterilized leaf humus, placed in a constant temperature incubator, at a temperature of 20°C and a humidity of 85%. Cultivate for 7-9d until the spores germinate. After the spores have germinated for 5-7 days, the seedlings are cultivated in flowerpots, and cultivated under the condition that the temperature is 18-20° C. and the humidity is 70%-85%. When the potted seedling age reaches 20-25d, the seedlings are transplanted to 226 The Ra content is 6780Bq / kg in the uranium tailings, the row spacing for planting is 12cm, the plant spacing is 10cm, the aboveground part is harvested after 90 days, and the aboveground stems of 3-5cm are left as foundation stubble. 1m 2 The average biomass of the aerial parts in the planting area is 1080g dry ash weight, of which the leaves are 920g and the stems are 160g. Ye Zhong 226 The average content of Ra is 128.5Bq / g, the stem 22...

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Abstract

The invention relates to a method for removing 226Ra in uranium tail sand and radioactive contaminated soil by plants. The method mainly uses an accumulation plant of the 226Ra, namely a Pieris multifida, to accumulate the 226Ra in the uranium tail sand and the radioactive contaminated soil and simultaneously convey the 226Ra to the overground part of the plant, thereby removing the 226Ra in the uranium tail sand and the radioactive contaminated soil. The method has the following specific steps of: (1) spore germination cultivation; (2) potting seedling; (3) planting the plant in the uranium tail sand or the radioactive contaminated soil; (4) harvesting the overground part of the plant and executing centralized treatment on the harvested plant. The method has the advantages of being convenient to obtain materials, low in cost, high in remediation efficiency, easy to management, simple and convenient in steps, less in environmental risk, and the like, thereby being suitable for removing the 226Ra in the uranium tail sand and the radioactive contaminated soil in uranium mines, uranium water treatment factories, tailings pools and the like.

Description

technical field [0001] The invention relates to the field of phytoremediation of radioactive contamination, in particular to a planting 226 The Ra enrichment plant-Pieris multifida, removes uranium tailings and radioactively contaminated soil 226 Ra's technology. Background technique [0002] According to the "Thirty Years Radiation Environmental Quality Evaluation" report of my country's nuclear industry, the collective dose of radionuclides produced by the uranium mining and metallurgy system to the surrounding public accounts for about 91.5% of the total collective dose of the nuclear fuel system, and its main source of pollution is uranium. The waste rock excavated during the mining process, the waste rock eliminated by beneficiation, and the waste residue and tailings generated during the pretreatment and hydrometallurgy process, as well as the soil polluted by it. [0003] For heap leaching and uranium hydrometallurgy, the recovery rate of uranium is generally 80%-95%...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/00
Inventor 丁德馨李广悦胡南王永东李海涛殷杰马少维
Owner NANHUA UNIV
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