Method for restoring uranium milltailings by utilizing plants

A technology of phytoremediation and tailings sand, which is applied in the field of phytoremediation of uranium tailings sand, can solve problems such as limitations, and achieve the effects of low cost, increased environmental risk, and high restoration efficiency

Active Publication Date: 2010-02-10
NANHUA UNIV +1
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Problems solved by technology

However, the pokeweed selected in this patent cannot be directly planted in the uranium tailings sand, but must be planted in a cultivation matrix c

Method used

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Experimental program
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Effect test

specific Embodiment approach

[0036] A method for phytoremediation of uranium tailings sand, which involves planting the seedlings of uranium tailings sand in the contaminated soil of uranium tailings sand, making them survive, growing to the stage of harvesting seedlings, and performing centralized treatment as follows:

[0037] (1) Seed disinfection treatment: that is, in January of the first year, the boron will be returned to the seeds with HgCl 2 Treat for about 5 minutes, then rinse with tap water, and use the sand culture method to grow seedlings.

[0038] (2) The potting treatment is to transplant the seedlings into the uranium tailings sand when the seedling age reaches 40-50 days, and harvest after 100-120 days and concentrate on the above-ground parts, and keep 10-12 cm of above-ground stems as the stubble when harvesting. When new seedlings grow on the stubble, it will be harvested again around November, and 10-12 cm of the above-ground stems will be reserved as the base stubble, and the harves...

Embodiment 1

[0041] Embodiment 1, will fall back to seed with HgCl 2 Treat for about 5 minutes, then rinse with tap water, use sand culture method to raise seedlings, when the seedling age reaches 40-50 days, transplant the seedlings to uranium tailings sand with uranium content of 37.54mg / kg, manage carefully, fertilize reasonably, and Harvest after 100-120 days, the biomass of the whole plant is 46.6g / plant, the biomass of the stem is 26g / plant, the uranium content of the stem is 899.73mg / kg, the biomass of the leaves is 12g / plant, and the biomass of the leaves is 12g / plant. The uranium content is 191.22mg / kg, the root biomass is 8.6g / plant, and the uranium content is 541.55mg / kg. Each Boluohui plant can take away 25.3mg of uranium from uranium tailings and fix 4.65mg of soluble uranium.

Embodiment 2

[0042] Embodiment 2, will fall back to seed with HgCl 2 Treat for about 5 minutes, then rinse with tap water, use sand culture method to raise seedlings, when the seedling age reaches 40-50 days, transplant the seedlings into uranium tailings sand with uranium content of 137.54mg / kg, manage carefully, fertilize reasonably, and Harvest after 200-240 days, the biomass of the whole plant is 61.5g / plant, the biomass of the stem is 35g / plant, the uranium content of the stem is 2316.94mg / kg, the biomass of the leaves is 16g / plant, and the biomass of the leaves is 16g / plant. The uranium content is 131.22mg / kg, the root biomass is 10.5g / plant, and the uranium content is 1443.16mg / kg. Each Boluohui plant can take away 83.17mg of uranium from uranium tailings and fix 15.15mg of soluble uranium.

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Abstract

The invention provides a method for restoring uranium milltailings by utilizing plants, which is a technique for restoring the uranium milltailings by utilizing uranium-enriched plants (macleaya cordata) as the material. The method directly plants macleaya cordata into the uranium milltailings without other supplementary means and comprises the following steps: (1) sterilizing seeds; (2) plantingseedlings in pots; (3) transplanting the plants into the uranium milltailings; (4) and carrying out the centralized processing on the reaped overground part. The method solves the problem that the prior uranium milltailings release uranium and heavy metals under natural conditions to damage the environment. The method has the advantages of simple operation and management, high restoration rate aswell as low cost and environmental risk and beautifies the environment. The method is suitable for treating solid uranium waste storage yards in uranium mines, hydrometallurgy plants, various ettle and milltailing warehouses, and the like.

Description

technical field [0001] The invention relates to the technical field of phytoremediation of uranium tailing sand, and relates to a technology for removing uranium pollution from uranium tailing sand by planting uranium enrichment plants-Macleaya cordata. Background technique [0002] The solid wastes of uranium mines and water smelters are mainly waste rocks excavated from mining, ores pre-selected and eliminated, as well as slag or tailings produced during pretreatment and extraction and smelting. These solid wastes have low levels of radioactivity and are very large, with tailings roughly equal in volume to raw ore. Although the residual uranium in it is less than 10% of the original ore content, 70-80% of the total radioactivity of the original ore is still retained in the tailings. The solid waste pollutes the nearby land, or due to the rainwater, the pollutants flow into the river with the runoff, often Cause a certain degree of soil pollution and water pollution. Ther...

Claims

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Application Information

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IPC IPC(8): B09C1/00A01C1/08A01G1/00B09B5/00
Inventor 丁德馨李广悦胡南刘玉龙吴艳琼谢红艳王永东殷杰胡劲松刘洋马少维
Owner NANHUA UNIV
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