Organic acid eluting agent as well as preparation method and application thereof

Abstract

The invention relates to an organic acid eluting agent and a preparation method and application thereof, and belongs to the technical field of radionuclide contaminated soil remediation and treatment. The organic acid eluting agent provided by the invention comprises the following components: ferric salt, organic acid, an oxidizing agent and a chelating agent, wherein the chelating agent is 1-hydroxyethylidene-1, 1-diphosphonic acid and salicylhydroxamic acid; the molar ratio of the ferric salt to the organic acid to the hydroxyethylidene diphosphonic acid to the salicylhydroxamic acid is as follows: the ferric salt to the organic acid to the hydroxyethylidene diphosphonic acid to the salicylhydroxamic acid is equal to (0.03 to 0.07) to (0.3 to 0.6) to (2.5 to 3.5) to (0.1 to 0.3). The organic acid eluting agent provided by the invention avoids damage to the soil structure, the highest removal rate of uranium in soil can reach 94% or above, the soil radioactivity level is reduced to meet the national standard, effective remediation of soil is realized, and the organic acid eluting agent has high application value in the technical field of remediation and treatment of radionuclide contaminated soil.

Description

Technical Field

[0001] The present invention relates to the technical field of radionuclide contaminated soil remediation and treatment, and in particular to an organic acid eluting agent and a preparation method and application thereof. Background Art

[0002] With the large-scale development and utilization of nuclear energy in various regions, the continuous mining of uranium resources has caused more and more significant pollution to the soil environment around the mines. The slag, dust, aerosols, etc. produced by the mining and processing of uranium-containing minerals are continuously deposited, and are combined with the soil under long-term wind erosion and hydraulic action to transform into various difficult-to-remove components. Uranium-containing minerals not only cause radioactive damage to organisms, but also have chemical toxicity. As they are transmitted through the food chain, they may eventually be enriched in the human body and damage human health.

[0003] The remediation of uranium contamination in soil has become one of the biggest challenges in environmental governance and an environmental problem that needs to be urgently addressed. It is urgent and necessary to carry out research on pollution control and treatment technologies for radioactive uranium elements, which is of great significance to the ecological environment governance and protection of uranium mines in my country. Uranium exists in the soil in complex and diverse forms. Considering the need to restore the normal use function of the soil while effectively removing uranium, the use of appropriate remediation technology is the key and difficulty in solving the problem of radioactive nuclide soil contamination. There are many studies on chemical leaching remediation technology in the treatment of uranium contaminated soil, and weak acid eluents have certain development prospects because of their small damage to soil structure and low cost. However, the existing technology mostly uses a variety of weak acid reagents and repeated leaching solutions.

[0004] Therefore, the development of a new type of organic acid eluting agent that is green, efficient, has excellent performance, and has a high removal rate of uranium in the soil is of great significance for the protection and remediation of my country's radioactive contaminated environment and the recovery of radionuclide resources. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and provide an organic acid eluent and its preparation method and application. The organic acid eluent provided by the present invention can reduce the radioactivity level in uranium contaminated soil to within the range of national standards, effectively realizing the remediation of uranium contaminated soil.

[0006] To achieve the above object, the technical solution adopted by the present invention is:

[0007] In the first aspect, the present invention provides an organic acid eluent, characterized in that it comprises the following components: an iron salt, an organic acid, an oxidant, and a chelating agent; the chelating agent is hydroxyethylidene diphosphonic acid and salicylic acid; the molar ratio of the iron salt, the organic acid, hydroxyethylidene diphosphonic acid and salicylic acid is iron salt: organic acid: hydroxyethylidene diphosphonic acid: salicylic acid = (0.03-0.07): (0.3-0.6): (2.5-3.5): (0.1-0.3).

[0008] The main components of the organic acid eluent provided by the present invention are iron salt, organic acid, two chelating agents and oxidant, wherein: trivalent iron ions can promote the conversion of insoluble tetravalent uranium in soil particles into soluble hexavalent uranium, so as to be dissolved and removed; hydrogen ions provided by the organic acid can occupy adsorption sites on the surface of soil particles, reduce the risk of uranium re-adsorption in the solution, and promote the dissociation of soil particles; chelating agents are selected from hydroxyethylidene diphosphonic acid and salicylic hydroxamic acid, which respectively provide phosphonic acid groups and oxime groups, can effectively capture uranium ions free in the solution, and further improve the restoration effect of contaminated soil; the addition of the oxidant can promote the rapid oxidation of tetravalent uranium in the residue state into hexavalent uranium.

[0009] The present invention can significantly improve the removal rate of uranium in the soil by the eluent by limiting the specific ratio of iron salt, organic acid and two chelating agents. Within the range specified by the present invention, the removal rate of uranium in the soil by the eluent can reach more than 89%, and the soil remediation effect is good. When the dosage ratio of iron salt and organic acid exceeds the range, the removal rate of uranium in the soil by the eluent will be significantly reduced to only 55-65%; the change in the ratio of the chelating agent will also have a certain impact. When it is outside the ratio range, the removal rate of uranium by the eluent drops to 77-83%; and when the oxidant is removed, the removal rate of uranium in the soil by the eluent is only about 37% at most.

[0010] The eluent provided by the present invention is a weakly acidic eluent, which has little damage to the soil structure and a high removal rate of uranium in the soil. When treating soil with an original uranium concentration of 721 mg / kg, the removal rate can reach more than 94%, so that the radioactivity level of the soil is reduced to meet the requirements of national standards, achieving a good soil restoration effect, and having important significance in the protection and remediation of radioactively contaminated environments and the recovery of nuclides.

[0011] Preferably, the iron salt is ferric chloride, and the oxidant is sodium chlorite.

[0012] Ferric chloride is used because the chloride ions in it can easily combine with uranium to form a soluble complex that transfers with the solution and improves the removal rate.

[0013] Preferably, the molar ratio of the iron salt to the oxidant is (3-7):3.

[0014] Preferably, the organic acid is citric acid and oxalic acid.

[0015] A combination of citric acid and oxalic acid is selected, in which oxalate ions are easy to combine with uranium to further form soluble uranium complexes, which are transferred with the elution solution to achieve a better separation effect from the soil.

[0016] Preferably, the molar ratio of citric acid to oxalic acid is (1-3):(2-3).

[0017] In a second aspect, the present invention provides a method for preparing the above-mentioned organic acid eluent, comprising the following steps:

[0018] (1) adding an oxidant solution to solution A in an ice-water bath, dissolving and mixing, and obtaining solution B; wherein solution A comprises an iron salt and an organic acid;

[0019] (2) adding a chelating agent into the solution B, dissolving and mixing the solution, and then allowing the solution to stand for aging to obtain the organic acid eluent.

[0020] Preferably, the dissolving and mixing is stirring for 1-2 hours.

[0021] Preferably, in step (2), the temperature of the static aging is room temperature, and the time of the static aging is 20-28 hours.

[0022] Aging under the above-mentioned static aging conditions can increase the stability of the system, allowing weak chemical bonds between some components to be combined without affecting the components still being able to function independently when the eluent is used.

[0023] In a third aspect, the present invention provides the use of the above-mentioned organic acid eluent in the remediation of heavily uranium-contaminated soil.

[0024] Preferably, the application comprises the following steps:

[0025] The organic acid eluting agent is added to the uranium contaminated soil, and the uranium contaminated soil is remediated through eluting, mixing, and mud-water separation.

[0026] As a preferred solution, the addition ratio of soil and organic acid leaching agent is 1t:1-3m 3 ; Carry out leaching treatment at room temperature. When the concentration of the above organic acid leaching agent is about 0.03-0.07 mol / L iron salt, the highest uranium removal rate can be achieved after leaching treatment for about 8 hours.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] The organic acid eluent provided by the present invention significantly improves the removal effect of the eluent on uranium in the soil by combining iron salt, organic acid, oxidant, chelating agent, and optimizing the ratio of iron salt, organic acid and two chelating agents. The eluent of the present invention is weakly acidic, avoiding damage to the soil structure, and at the same time, its removal rate of uranium in the soil can reach up to 94% or more, reducing the soil radioactivity level to below 1Bq / g, meeting national standards, achieving effective soil repair, and having high application value in the field of radionuclide contaminated soil repair and treatment technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of an organic acid eluent prepared in Example;

[0030] Figure 2 The diagram shows the remediation effect of the eluents in Example 1-5 (ae) and Comparative Example 1-7 (f) on uranium contaminated soil. DETAILED DESCRIPTION

[0031] In order to better illustrate the purpose, technical scheme and advantages of the present invention, the present invention will be further described below in conjunction with specific examples. The test methods used in the following examples are conventional methods unless otherwise specified; the materials and reagents used are reagents and materials that can be obtained from commercial channels unless otherwise specified.

[0032] Example 1

[0033] An embodiment of the organic acid eluent of the present invention, the preparation method of the organic acid eluent of this embodiment is:

[0034] (1) Disperse 0.03 mol of anhydrous ferric chloride in 800 mL of deionized water and stir for 30 min until all solid particles are dissolved to obtain a yellow transparent solution; then slowly add 0.1 mol of citric acid and 0.2 mol of oxalic acid and stir until all white solid powder is dissolved to obtain a mixed solution;

[0035] (2) dispersing 0.03 mol of sodium chlorite into 200 mL of deionized water, ultrasonicating for 5 min, and stirring for 30 min to obtain a sodium chlorite solution; slowly adding the sodium chlorite solution to the mixed solution in an ice water bath, and stirring for 1.5 h;

[0036] (3) 3 mmol of hydroxyethylidene diphosphonic acid and 0.2 mmol of salicylic hydroxamic acid were added to the mixed solution, stirred for 1 hour until all the solid particles were completely dissolved, and then allowed to stand and age at room temperature for 1 day to prepare an organic acid eluent.

[0037] Example 2

[0038] An embodiment of the organic acid eluent of the present invention, the preparation method of the organic acid eluent of this embodiment is:

[0039] (1) Disperse 0.05 mol of anhydrous ferric chloride in 800 mL of deionized water and stir for 30 min until all solid particles are dissolved to obtain a yellow transparent solution; then slowly add 0.2 mol of citric acid and 0.25 mol of oxalic acid and stir until all white solid powder is dissolved to obtain a mixed solution;

[0040] (2) dispersing 0.03 mol of sodium chlorite into 200 mL of deionized water, ultrasonicating for 5 min, and stirring for 30 min to obtain a sodium chlorite solution; slowly adding the sodium chlorite solution to the mixed solution in an ice water bath, and stirring for 1.5 h;

[0041] (3) 3 mmol of hydroxyethylidene diphosphonic acid and 0.2 mmol of salicylic hydroxamic acid were added to the mixed solution, stirred for 1 hour until all the solid particles were completely dissolved, and then allowed to stand and age at room temperature for 1 day to prepare an organic acid eluent.

[0042] Example 3

[0043] An embodiment of the organic acid eluent of the present invention, the preparation method of the organic acid eluent of this embodiment is:

[0044] (1) Disperse 0.07 mol of anhydrous ferric chloride in 800 mL of deionized water and stir for 30 min until all solid particles are dissolved to obtain a yellow transparent solution; then slowly add 0.3 mol of citric acid and 0.3 mol of oxalic acid and stir until all white solid powder is dissolved to obtain a mixed solution;

[0045] (2) dispersing 0.03 mol of sodium chlorite into 200 mL of deionized water, ultrasonicating for 5 min, and stirring for 30 min to obtain a sodium chlorite solution; slowly adding the sodium chlorite solution to the mixed solution in an ice water bath, and stirring for 1.5 h;

[0046] (3) 3 mmol of hydroxyethylidene diphosphonic acid and 0.2 mmol of salicylic hydroxamic acid were added to the mixed solution, stirred for 1 hour until all the solid particles were completely dissolved, and then allowed to stand and age at room temperature for 1 day to prepare an organic acid eluent.

[0047] Example 4

[0048] An embodiment of the organic acid eluent of the present invention, the preparation method of the organic acid eluent described in this embodiment is different from that of Example 2 only in that, in step (3), 2.5 mmol of hydroxyethylidene diphosphonic acid and 0.3 mmol of salicylic hydroxamic acid are added.

[0049] Example 5

[0050] An embodiment of the organic acid eluent of the present invention, the preparation method of the organic acid eluent described in this embodiment is different from that of Example 2 only in that, in step (3), 3.5 mmol of hydroxyethylidene diphosphonic acid and 0.1 mmol of salicylic hydroxamic acid are added.

[0051] Comparative Example 1

[0052] A washing agent is prepared by the following method:

[0053] (1) Disperse 0.09 mol of anhydrous ferric chloride in 800 mL of deionized water and stir for 30 min until all solid particles are dissolved to obtain a yellow transparent solution; then slowly add 0.05 mol of citric acid and 0.1 mol of oxalic acid and stir until all white solid powder is dissolved to obtain a mixed solution;

[0054] (2) dispersing 0.03 mol of sodium chlorite into 200 mL of deionized water, ultrasonicating for 5 min, and stirring for 30 min to obtain a sodium chlorite solution; slowly adding the sodium chlorite solution to the mixed solution in an ice water bath, and stirring for 1.5 h;

[0055] (3) 3 mmol of hydroxyethylidene diphosphonic acid and 0.2 mmol of salicylic hydroxamic acid were added to the mixed solution, stirred for 1 hour until all the solid particles were completely dissolved, and then allowed to stand and age at room temperature for 1 day to prepare an eluent.

[0056] Comparative Example 2

[0057] A washing agent is prepared by the following method:

[0058] (1) Disperse 0.015 mol of anhydrous ferric chloride in 800 mL of deionized water and stir for 30 min until all solid particles are dissolved to obtain a yellow transparent solution; then slowly add 0.6 mol of citric acid and 0.4 mol of oxalic acid and stir until all white solid powder is dissolved to obtain a mixed solution;

[0059] (2) dispersing 0.03 mol of sodium chlorite into 200 mL of deionized water, ultrasonicating for 5 min, and stirring for 30 min to obtain a sodium chlorite solution; slowly adding the sodium chlorite solution to the mixed solution in an ice water bath, and stirring for 1.5 h;

[0060] (3) 4 mmol of hydroxyethylidene diphosphonic acid and 0.35 mmol of salicylic hydroxamic acid were added to the mixed solution, stirred for 1 hour until all the solid particles were completely dissolved, and then allowed to stand and age at room temperature for 1 day to prepare an eluent.

[0061] Comparative Example 3

[0062] A washing agent is prepared by the following method:

[0063] (1) Disperse 0.07 mol of anhydrous ferric chloride in 800 mL of deionized water and stir for 30 min until all solid particles are dissolved to obtain a yellow transparent solution; then slowly add 0.3 mol of citric acid and 0.3 mol of oxalic acid and stir until all white solid powder is dissolved to obtain a mixed solution;

[0064] (2) 3 mmol of hydroxyethylidene diphosphonic acid and 0.2 mmol of salicylic hydroxamic acid were added to the mixed solution, stirred for 1 hour until all solid particles were completely dissolved, and then allowed to stand and age at room temperature for 1 day to prepare an eluent.

[0065] Comparative Example 4

[0066] A washing agent is prepared by the following method:

[0067] (1) Disperse 0.05 mol of anhydrous ferric chloride in 800 mL of deionized water and stir for 30 min until all solid particles are dissolved to obtain a yellow transparent solution; then slowly add 0.2 mol of citric acid and 0.25 mol of oxalic acid and stir until all white solid powder is dissolved to obtain a mixed solution;

[0068] (2) Dispersing 0.03 mol of sodium chlorite into 200 mL of deionized water, ultrasonicating for 5 min, and stirring for 30 min to obtain a sodium chlorite solution; slowly adding the sodium chlorite solution to the mixed solution under ice-water bath conditions, stirring for 1.5 h, and preparing an eluent.

[0069] Comparative Example 5

[0070] A washing agent is prepared by the following method:

[0071] (1) Disperse 0.05 mol of anhydrous ferric chloride in 800 mL of deionized water and stir for 30 min until all solid particles are dissolved to obtain a yellow transparent solution; then slowly add 0.2 mol of citric acid and 0.25 mol of oxalic acid and stir until all white solid powder is dissolved to obtain a mixed solution;

[0072] (2) dispersing 0.03 mol of sodium chlorite into 200 mL of deionized water, ultrasonicating for 5 min, and stirring for 30 min to obtain a sodium chlorite solution; slowly adding the sodium chlorite solution to the mixed solution in an ice water bath, and stirring for 1.5 h;

[0073] (3) 0.5 mmol of salicylic hydroxamic acid was added to the mixture, stirred for 1 h until all solid particles were completely dissolved, and then allowed to stand at room temperature for 1 day to age, thereby preparing an organic acid eluent.

[0074] Comparative Example 6

[0075] The difference between Comparative Example 6 and Comparative Example 5 is that in step (3), 1 mmol of hydroxyethylidene diphosphonic acid and 0.5 mmol of salicylic hydroxamic acid are added.

[0076] Comparative Example 7

[0077] A washing agent is prepared by the following method:

[0078] (1) Disperse 0.05 mol of anhydrous ferric chloride in 800 mL of deionized water and stir for 30 min until all solid particles are dissolved to obtain a yellow transparent solution; then slowly add 0.2 mol of citric acid and 0.25 mol of oxalic acid and stir until all white solid powder is dissolved to obtain a mixed solution;

[0079] (2) dispersing 0.03 mol of sodium chlorite into 200 mL of deionized water, ultrasonicating for 5 min, and stirring for 30 min to obtain a sodium chlorite solution; slowly adding the sodium chlorite solution to the mixed solution in an ice water bath, and stirring for 1.5 h;

[0080] (3) 3 mmol of hydroxyethylidene diphosphonic acid and 0.2 mmol of disodium ethylenediaminetetraacetate were added to the mixed solution, stirred for 1 hour until all the solid particles were completely dissolved, and then allowed to stand and age at room temperature for 1 day to prepare an eluent.

[0081] Effect example

[0082] In order to explore the remediation effect of the organic acid eluent provided by the present invention on the heavily uranium contaminated soil, the eluents in the examples and comparative examples were used for the elution remediation of the heavily uranium contaminated soil. The specific test steps are as follows:

[0083] The eluent was added to the uranium-contaminated soil after grinding and screening. The initial concentration of uranium in the soil was 721 mg / kg. The ratio of soil to eluent was 1t:2m 3 ; Carry out elution treatment at room temperature, then mix, stir, separate mud and water to complete soil remediation;

[0084] During the 24-hour treatment period, samples were taken to determine the uranium concentration in the soil and the uranium removal rate was calculated. The results are as follows: Figure 2 .in Figure 2 - (a)-(e) are the removal rates of uranium in contaminated soil by the organic acid eluents in Examples 1-5 at different elution times; Figure 2 -(f) is a comparison of the removal rate of uranium in contaminated soil by the eluents in Comparative Examples 1-7 at different elution times with that of Example 2.

[0085] Depend on Figure 2 It can be seen that:

[0086] (1) After 8 hours of leaching with the eluents of each embodiment and comparative example, the removal rate of uranium in the soil basically reached the highest point. The organic acid eluents in the embodiments were significantly better than the comparative examples in remediation of uranium-contaminated soil. Among them, the organic acid eluent solution used in Example 2 had the best effect. After remediation, the soil radioactivity level was 0.94 Bq / g, which met the national standard.

[0087] The organic acid eluent of Example 1 can achieve a maximum removal rate of 89.3% for uranium in the soil, and then the removal rate fluctuates around 90%; the organic acid eluent of Example 2 can achieve a maximum removal rate of 94.7% for uranium in the soil, and then the removal rate fluctuates around 93%; the organic acid eluent of Example 3 can achieve a maximum removal rate of 90.2% for uranium in the soil, and then the removal rate fluctuates around 90%; the organic acid eluent of Example 4 can achieve a maximum removal rate of 93.4% for uranium in the soil, and then the removal rate fluctuates around 92%; the organic acid eluent of Example 5 can achieve a maximum removal rate of 91.2% for uranium in the soil, and then the removal rate fluctuates around 91%.

[0088] (2) Compared with the embodiments within the scope of the present invention, the eluent in Comparative Example 1 adjusts the dosage ratio of iron salt and organic acid so that the ratio of iron salt is higher than the limit and the ratio of organic acid is lower than the limit. Under the same treatment conditions, the uranium removal rate of Comparative Example 1 is as high as 55.7%, and then the removal rate fluctuates around 54%; in Comparative Example 2, the dosage ratio of iron salt, organic acid and chelating agent is adjusted so that the ratio of iron salt is lower than the limit and the ratio of organic acid and chelating agent is higher than the limit, which falls outside the scope of the present invention. Under the same treatment conditions, the uranium removal rate in Comparative Example 2 is as high as 63.9%, and then the removal rate fluctuates around 63%; in Comparative Example 3, no oxidant sodium chlorite is added. Under the same treatment conditions, the uranium removal rate is as high as 37.3%, and then the removal rate fluctuates around 30%; both are significantly lower than the removal rates of the embodiments. It can be seen that under the specific ratio of iron salt, organic acid and chelating agent of the present invention, the insoluble tetravalent uranium in soil particles can be better promoted to be converted into soluble hexavalent uranium, while reducing the risk of uranium re-adsorption in the solution, and significantly improving the removal effect of the eluent on uranium in the soil.

[0089] (3) Compared with Example 2, Comparative Examples 4-7 changed the use conditions of the chelating agent in the eluent: under the same soil treatment conditions, the eluent in Comparative Example 4 did not add a chelating agent, and the uranium removal rate reached a maximum of 79.1%, and then the removal rate fluctuated around 75%, and the eluent's uranium removal rate decreased significantly; in Comparative Example 5, hydroxyethylidene diphosphonic acid was removed and the dosage of salicylic hydroxamic acid was increased, and the uranium removal rate in the soil was up to 77.6%, and then the removal rate fluctuated around 74%; in Comparative Example 6, the dosage ratio was adjusted, the proportion of hydroxyethylidene diphosphonic acid was reduced, and the proportion of salicylic hydroxamic acid was increased, and the uranium removal rate in the soil was up to 82.2%, and then the removal rate fluctuated around 80%; in Comparative Example 7, the chelating agent hydroxyethylidene diphosphonic acid / salicylic hydroxamic acid system was replaced with hydroxyethylidene diphosphonic acid / disodium ethylenediaminetetraacetic acid, and the uranium removal rate in the soil was up to 79.6%, and then the removal rate fluctuated around 75%. It can be seen that the chelating agent system and its ratio defined in the present invention are more conducive to effectively capturing uranium ions free in the solution, further improving the remediation effect of contaminated soil, and significantly improving the removal rate of uranium in the soil by the eluent.

[0090] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. An organic acid eluent, characterized in that The invention comprises the following components: iron salt, organic acid, oxidant and chelating agent; the chelating agent is hydroxyethylidene diphosphonic acid and salicylic acid; the molar ratio of the iron salt, organic acid, hydroxyethylidene diphosphonic acid and salicylic acid is iron salt: organic acid: hydroxyethylidene diphosphonic acid: salicylic acid = (0.03-0.07): (0.3-0.6): (2.5-3.5): (0.1-0.3).

2. The organic acid eluent according to claim 1, characterized in that The iron salt is ferric chloride, and the oxidant is sodium chlorite.

3. The organic acid eluent according to claim 1, characterized in that The molar ratio of the iron salt to the oxidant is (3-7):

3.

4. The organic acid eluent according to claim 1, characterized in that The organic acids are citric acid and oxalic acid.

5. The organic acid eluent according to claim 4, characterized in that The molar ratio of citric acid to oxalic acid is (1-3):(2-3).

6. The method for preparing the organic acid eluent according to claims 1-5, characterized in that: The following steps are involved: (1) adding an oxidant solution to solution A in an ice-water bath, dissolving and mixing, and obtaining solution B; wherein solution A comprises an iron salt and an organic acid; (2) adding a chelating agent into the solution B, dissolving and mixing the solution, and then allowing the solution to stand for aging to obtain the organic acid eluent.

7. The method for preparing the organic acid eluent according to claim 6, characterized in that: The dissolving and mixing step is stirring for 1-2 hours.

8. The method for preparing the organic acid eluent according to claim 6, characterized in that: In the step (2), the temperature of the static aging is room temperature, and the time of the static aging is 20-28 hours.

9. Use of the organic acid eluent as described in claims 1-5 in the remediation of heavily uranium contaminated soil.

10. The use of the organic acid eluent in the remediation of uranium contaminated soil as claimed in claim 9, characterized in that: The application comprises the following steps: The organic acid eluting agent is added to the uranium contaminated soil, and the uranium contaminated soil is remediated through eluting, mixing, and mud-water separation.

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