Method for removing uranium in gravel-containing protolith loose sand

A sandy, loose technology, applied in the field of contaminated soil remediation, to achieve the effect of large damage, low damage and high selectivity

Pending Publication Date: 2022-06-24
63653 FORCES PLA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

No specific uranium removal methods have been reported for soils of this nature

Method used

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  • Method for removing uranium in gravel-containing protolith loose sand
  • Method for removing uranium in gravel-containing protolith loose sand
  • Method for removing uranium in gravel-containing protolith loose sand

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035]1. Soil collection and preparation: Take 5cm (depth) loose sandy soil samples containing gravel on the surface in different areas in the field, dry and pulverize at 40°C, pass through a sieve with a particle size of 2cm, and then dry at 105-110°C 2-4h, mix evenly, sieve, and ball mill until the particle size of the loose sandy soil containing gravel is 200 mesh (74 μm).

[0036] 2. Extraction of uranium with different binding forms (two parallel samples are set, and the average value is taken):

[0037] 1) Extraction of ion-exchanged uranium: Take 1.5 g of pretreated loose sandy soil containing gravel and put it in a centrifuge tube, and add 30 mL of CH with a concentration of 1 mol / L. 3 COONa solution (extractant), adjust pH to 8, shake at room temperature for 3h, then centrifuge at 9800rpm for 10min with a centrifuge, remove the supernatant, and wash the centrifuge tube twice with 15mL deionized water (pH=7), Pour the washing solution into the original 100mL centrifug...

Embodiment 2

[0048] Using the pretreated sample in Example 1 as the raw material, the leaching test of uranium was carried out. The normal temperature is 25°C.

[0049] The gravel-containing raw rock loose sand, sodium bicarbonate and potassium permanganate were added to a headspace-sealed 50mL flask for the reaction, shaken at 160rpm at room temperature, and the sand and supernatant were separated by centrifugation. The soil was washed twice and combined with the supernatant, filtered with a pinhole syringe equipped with a 0.45 μm filter head, and the filtrate was analyzed by ICP-MS. The residual soil was dried, weighed, and completely dissolved to determine the residual soil uranium concentration.

[0050] The solid-to-liquid ratio described below is the dosage ratio of the leaching solution sodium bicarbonate to the soil sample (loose sandy soil containing original gravel). The soil sample dosage was 3 g.

[0051] Four factors and three levels of orthogonal experiments were carried ou...

Embodiment 3

[0060] Same as Example 1, the difference is that the leaching solution sodium bicarbonate is replaced with sodium citrate.

[0061] It was found that the extraction efficiency reached 53.57% after 408 hours. .

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Abstract

The invention discloses a method for removing uranium in gravel-containing protolith loose sand, and belongs to the technical field of contaminated soil remediation. The method comprises the following steps: adding a leaching agent and an oxidizing agent into the gravel-containing protolith loose sandy soil, oscillating at normal temperature, separating the sandy soil from supernate through centrifugation, washing the separated sandy soil twice, merging the supernate, filtering, and detecting the filtrate; wherein the oxidizing agent is potassium permanganate or hydrogen peroxide, and the mass ratio of the oxidizing agent to the gravel-containing protolith loose sandy soil is (0.005-0.02): 3. Compared with biological decontamination and physical decontamination methods, the method has the advantages of simplicity in operation, low treatment cost, wide uranium concentration range, high uranium extraction rate and the like.

Description

technical field [0001] The invention belongs to the technical field of contaminated soil remediation, and particularly relates to a method for removing uranium in loose sandy soil containing original rock containing gravel. Background technique [0002] With the development of the nuclear industry, radioactive ores such as metallic uranium are continuously mined. Although these tailings residues will be treated by special processes, the uranium in the tailings will be released again and enter the soil and eventually enter deeper soil layers or groundwater, causing soil or groundwater pollution. Soil is the first barrier to prevent uranium from entering groundwater, so the remediation of uranium-contaminated soil is of great significance. [0003] At present, the remediation methods of uranium-contaminated soil include physical remediation, bioremediation and chemical remediation. The physical remediation method refers to a method that achieves the purpose of remediation by...

Claims

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Application Information

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IPC IPC(8): B09C1/02B09C1/08
CPCB09C1/02B09C1/08
Inventor 周祥张春冯良齐徐辉王卫宪刘艳谢雨池
Owner 63653 FORCES PLA
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