Repairing agent for repairing radioactive contaminated soil and repairing use method of repairing agent

Abstract

The invention relates to a repairing agent for repairing radioactive contaminated soil and a repairing use method of the repairing agent. The repairing agent can clean away radionuclides in the radioactive contaminated soil and repair the radioactive contaminated soil, and the radionuclides can be easily precipitated from the cleaning solution, so that the effect of separating and enriching the radionuclides from the soil is achieved, the soil is repaired, and the radionuclides can be treated in a centralized mode. The repairing agent disclosed by the invention has relatively high practical value and is suitable for large-scale application.

Description

technical field

[0001] The present invention relates to the field of soil remediation, in particular to a remediation agent for the remediation of radioactively polluted soil, and also to a method of using the remediation agent for restoration. Background technique

[0002] Radioactive contaminated soil refers to soil contaminated by radioactive pollutants. Soil includes natural radioactive sources and man-made radioactive sources. Natural radioactive sources are those in natural products 40 K. 238 U. 226 Ra, 232 Elements such as Th undergo radioactive decay to produce a series of radioactive daughters, which are widely distributed in rock or soil environments. These radioactive elements form the background value of soil radioactivity, but because the dose is very low, it will not affect normal production and life. Man-made radioactive sources are the main sources of soil radioactive pollution, which mainly include pollution caused by nuclear tests, radioactive isotope...

Examples

preparation example 1

[0036] 1kg of chitosan was dissolved in 15kg of 1wt% acetic acid, stirred at room temperature for 6h; then 0.25kg of succinic anhydride dissolved in 1kg of acetone was added, and the reaction was stirred at room temperature for 10h; then, 1N was added to the mixture at room temperature The pH value was adjusted to 7-8 with NaOH, and stirred for 8 h; the reaction mixture was dialyzed with deionized water for 2 days using a dialysis bag with a molecular weight cut-off of 3500 Da, the dialysate was distilled under reduced pressure to remove the solvent, and then freeze-dried to obtain succinic acid-modified chitosan Sugar 0.8Kg.

Embodiment 1-3

[0038] Add 60 g of diethylene triamine penta(methylene phosphonic acid), 120 g of succinic acid-modified chitosan of Preparation Example 1, 60 g of sodium metaaluminate, and 160 g of concentrated hydrochloric acid (37%) into 600 g of deionized water , heated to 35° C. under stirring to dissolve completely, and after cooling, diluted to 1 / 8, 1 / 5, and 1 / 4 of the original concentration, respectively, to obtain the repairing agent of Example 1-3.

Embodiment 4

[0040] Add 12g of diethylenetriamine penta(methylenephosphonic acid), 36g of succinic acid-modified chitosan of Preparation Example 1, 12g of sodium metaaluminate, and 32g of concentrated hydrochloric acid (37%) into 908g of deionized water , heated to 35° C. under stirring to dissolve completely, and after cooling, the repairing agent of Example 4 was obtained.

technical field

[0001] The present invention relates to the field of soil remediation, in particular to a remediation agent for the remediation of radioactively polluted soil, and also to a method of using the remediation agent for restoration. Background technique

[0002] Radioactive contaminated soil refers to soil contaminated by radioactive pollutants. Soil includes natural radioactive sources and man-made radioactive sources. Natural radioactive sources are those in natural products 40 K. 238 U. 226 Ra, 232 Elements such as Th undergo radioactive decay to produce a series of radioactive daughters, which are widely distributed in rock or soil environments. These radioactive elements form the background value of soil radioactivity, but because the dose is very low, it will not affect normal production and life. Man-made radioactive sources are the main sources of soil radioactive pollution, which mainly include pollution caused by nuclear tests, radioactive isotope...

Examples

preparation example 1

[0036] 1kg of chitosan was dissolved in 15kg of 1wt% acetic acid, stirred at room temperature for 6h; then 0.25kg of succinic anhydride dissolved in 1kg of acetone was added, and the reaction was stirred at room temperature for 10h; then, 1N was added to the mixture at room temperature The pH value was adjusted to 7-8 with NaOH, and stirred for 8 h; the reaction mixture was dialyzed with deionized water for 2 days using a dialysis bag with a molecular weight cut-off of 3500 Da, the dialysate was distilled under reduced pressure to remove the solvent, and then freeze-dried to obtain succinic acid-modified chitosan Sugar 0.8Kg.

Embodiment 1-3

[0038] Add 60 g of diethylene triamine penta(methylene phosphonic acid), 120 g of succinic acid-modified chitosan of Preparation Example 1, 60 g of sodium metaaluminate, and 160 g of concentrated hydrochloric acid (37%) into 600 g of deionized water , heated to 35° C. under stirring to dissolve completely, and after cooling, diluted to 1 / 8, 1 / 5, and 1 / 4 of the original concentration, respectively, to obtain the repairing agent of Example 1-3.

Embodiment 4

[0040] Add 12g of diethylenetriamine penta(methylenephosphonic acid), 36g of succinic acid-modified chitosan of Preparation Example 1, 12g of sodium metaaluminate, and 32g of concentrated hydrochloric acid (37%) into 908g of deionized water , heated to 35° C. under stirring to dissolve completely, and after cooling, the repairing agent of Example 4 was obtained.

Images