Method for microwave simultaneous vitrification of radioactive thermal insulation wool and radioactive waste resins

Abstract

The application discloses a method for simultaneously glassifying radioactive thermal insulation cotton and radioactive waste resin by microwave. The radioactive waste resin is a mixed ion exchange resin composed of anion exchange resin and cation exchange resin, and the volume ratio of the anion exchange resin to the cation exchange resin is 2:1. The radioactive thermal insulation cotton and the radioactive waste resin are mixed according to the mass ratio of 2:1 to 2:3, and a certain amount of boric acid or sodium tetraborate is added as an additive, the mass ratio of the radioactive thermal insulation cotton to the boric acid or sodium tetraborate is 48:1 to 12:1, then the mixture is treated by microwave at a temperature of 1100 to 1400 DEG C for 1 to 3 hours, then the temperature is lowered to 400 to 600 DEG C for 1 to 3 hours, and then the mixture is naturally cooled to room temperature. The glass body generated by the method has stable chemical properties and strong anti-leaching capacity, and can realize volume reduction and weight reduction of radioactive waste, so that the storage and disposal cost in the later stage is greatly reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of radioactive waste treatment, in particular to a method for simultaneously glassifying radioactive thermal insulation cotton and radioactive waste resin by microwave. BACKGROUND

[0002] Radioactive thermal insulation cotton and radioactive waste resin are generated during the operation and maintenance of a pressurized water reactor, and radioactive waste resin is also generated during the treatment of radioactive waste water generated by the pressurized water reactor. Such radioactive waste resin is usually low-level radioactive waste or high-level radioactive waste, and the radioactive thermal insulation cotton is extremely low-level radioactive waste. The radioactive thermal insulation cotton is prone to rebound after compression.

[0003] Currently, there is no good method for treating radioactive thermal insulation cotton, and the traditional method for treating radioactive waste resin is cement solidification. This method has obvious volume increase effect, that is, the volume of the treated product is greater than that of the waste before treatment. The volume increase problem of cement solidification significantly increases the subsequent waste disposal cost, and is contrary to the concept of "radioactive waste minimization" in the current field of radioactive waste management. SUMMARY

[0004] The present application aims to overcome the shortcomings of the prior art and provides a method for simultaneously glassifying radioactive thermal insulation cotton and radioactive waste resin by microwave. The radioactive thermal insulation cotton and the radioactive waste resin are mixed, and a certain amount of additive is added, and then treated by microwave to simultaneously glassify the radioactive thermal insulation cotton and the radioactive waste resin, which greatly reduces the volume of waste to be finally disposed. The method is relatively simple, efficient and convenient, the glassified body produced has stable chemical properties, and the volume of waste to be finally disposed is greatly reduced, which has significant economic benefits.

[0005] To achieve the above-mentioned purpose, the technical solutions designed by the present application are as follows:

[0006] The present application provides a method for simultaneously glassifying radioactive thermal insulation cotton and radioactive waste resin by microwave, comprising the following steps:

[0007] 1) mixing the radioactive thermal insulation cotton and the radioactive waste resin to obtain a radioactive mixture;

[0008] 2) adding an additive to the radioactive mixture, then glassifying under microwave conditions, then keeping warm at 400-600 DEG C for 1-3 hours, and finally cooling to room temperature.

[0009] Further, in step 1), the mass ratio of the radioactive thermal insulation cotton to the radioactive waste resin is 2:1-2:3.

[0010] Further, the mass ratio of the radioactive insulation cotton to the radioactive waste resin is 1:1.

[0011] Further, the radioactive waste resin is an ion exchange resin mixed by anion exchange resin and cation exchange resin; wherein the volume ratio of the anion exchange resin to the cation exchange resin is 3:1-2:1.

[0012] Further, the volume ratio of the anion exchange resin to the cation exchange resin is 2:1.

[0013] Further, in the step 2), the mass ratio of the radioactive insulation cotton to the additive in the radioactive mixture is 48:1-12:1; and the additive is boric acid or sodium tetraborate.

[0014] Further, the mass ratio of the radioactive insulation cotton to the additive in the radioactive mixture is 24:1.

[0015] Further, in the step 2), the microwave treatment temperature is 1100-1400℃, and the microwave treatment time is 1-3h.

[0016] Further, in the step 2), the microwave treatment temperature is 1300℃, and the microwave treatment time is 3h.

[0017] Further, in the step 2), the insulation temperature is 500℃, and the insulation time is 1h.

[0018] The beneficial effects of the present application are as follows:

[0019] The present application adopts microwave to simultaneously glassify radioactive insulation cotton and radioactive waste resin, which is different from the traditional method of glassifying high-level radioactive waste. In the present application, the radioactive insulation cotton is used as the glass forming material, and no additional material is added as the glass forming material, thereby reducing the amount of final waste. The method developed in the present application generates a glass body with stable chemical properties and strong anti-leaching ability, and can realize both volume reduction and weight reduction of radioactive waste, thereby greatly reducing the storage and disposal costs in the later stage. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 XRD pattern of the glass solidified body obtained in Example 1;

[0021] Figure 2 XRD pattern of the glass solidified body obtained in Example 2;

[0022] Figure 3 XRD pattern of the glass solidified body obtained in Example 3. DETAILED DESCRIPTION

[0023] The application will be further described in conjunction with specific examples so as to be well understood by those skilled in the art.

[0024] Example 1

[0025] The method for microwave simultaneous glassification of radioactive thermal insulation cotton and radioactive waste resin comprises the following steps:

[0026] (1) 48 g of radioactive thermal insulation cotton is mixed with 48 g of radioactive waste resin (the radioactive waste resin contains 32 g of anion exchange resin and 16 g of cation exchange resin) to obtain a radioactive mixture;

[0027] (2) 2 g of boric acid is added to the radioactive mixture, and after mixing, microwave treatment is performed at 1300°C for 3 h, then the temperature is lowered to 500°C for 1 h, and finally natural cooling to room temperature is performed.

[0028] Figure 1 It is shown that the obtained glassification body is amorphous, indicating that the obtained glassification body is completely glassy.

[0029] Example 2

[0030] The method for microwave simultaneous glassification of radioactive thermal insulation cotton and radioactive waste resin comprises the following steps:

[0031] (1) 48 g of radioactive thermal insulation cotton is mixed with 48 g of radioactive waste resin (the radioactive waste resin contains 32 g of anion exchange resin and 16 g of cation exchange resin) to obtain a radioactive mixture;

[0032] (2) 2 g of boric acid is added to the radioactive mixture, and after mixing, microwave treatment is performed at 1300°C for 3 h, then the temperature is lowered to 500°C for 1 h, and finally natural cooling to room temperature is performed.

[0033] Figure 2 It is shown that the obtained glassification body is amorphous, indicating that the obtained glassification body is completely glassy.

[0034] Example 3

[0035] The method for microwave simultaneous glassification of radioactive thermal insulation cotton and radioactive waste resin comprises the following steps:

[0036] (1) 48 g of radioactive thermal insulation cotton is mixed with 48 g of radioactive waste resin (the radioactive waste resin contains 32 g of anion exchange resin and 16 g of cation exchange resin) to obtain a radioactive mixture;

[0037] (2) 2 g of boric acid is added to the radioactive mixture, and after mixing, microwave treatment is performed at 1300°C for 3 h, then the temperature is lowered to 500°C for 1 h, and finally natural cooling to room temperature is performed.

[0038] Figure 3 The obtained glass solidified body is amorphous phase, which indicates that the obtained glass solidified body is completely glassy.

[0039] Example 4

[0040] The method for microwave simultaneous glass solidification of radioactive thermal insulation cotton and radioactive waste resin comprises the following steps:

[0041] (1) 48 g of radioactive thermal insulation cotton is mixed with 72 g of radioactive waste resin (the radioactive waste resin contains 54 g of anion exchange resin and 18 g of cation exchange resin) to obtain a radioactive mixture;

[0042] (2) After 2 g of boric acid is added to the radioactive mixture and mixed, microwave treatment is performed at 1300°C for 3 h, then the temperature is lowered to 500°C for 1 h, and finally natural cooling to room temperature is performed.

[0043] Example 5

[0044] The method for microwave simultaneous glass solidification of radioactive thermal insulation cotton and radioactive waste resin comprises the following steps:

[0045] (1) 48 g of radioactive thermal insulation cotton is mixed with 24 g of radioactive waste resin (the radioactive waste resin contains 16 g of anion exchange resin and 8 g of cation exchange resin) to obtain a radioactive mixture;

[0046] (2) After 2 g of boric acid is added to the radioactive mixture and mixed, microwave treatment is performed at 1300°C for 3 h, then the temperature is lowered to 500°C for 1 h, and finally natural cooling to room temperature is performed.

[0047] Comparative Example 1

[0048] 48 g of radioactive thermal insulation cotton is treated by microwave at 1300°C for 3 h, then the temperature is lowered to 500°C for 1 h, and finally natural cooling to room temperature is performed.

[0049] Comparative Example 2

[0050] 48 g of radioactive waste resin (the radioactive waste resin contains 32 g of anion exchange resin and 16 g of cation exchange resin) is treated by microwave at 1300°C for 3 h, then the temperature is lowered to 500°C for 1 h, and finally natural cooling to room temperature is performed.

[0051] Table 1 Product Performance Comparison

[0052]

[0053] The weight loss ratio of Comparative Example 1 is low; the weight loss ratio of Comparative Example 2 is high, but the product does not form a glass solidified body; the products of Example 1, Example 2 and Example 3 have similar properties, but the microwave treatment temperature of Example 2 is higher, and the energy consumption is relatively large; the volume reduction ratio of Example 4 is relatively low; and the weight loss ratio of Example 5 is relatively low. In summary, the volume reduction ratio, weight loss ratio and glass solidified body density results of Example 1 are shown, and the treatment effect of Example 1 is the most obvious.

[0054] Other parts not described in detail are prior art. Although the above examples make a detailed description of the present application, it is only a part of the embodiments of the present application, not all the embodiments, and other embodiments can be obtained according to the present embodiments without creativity, which belong to the protection scope of the present application.

Claims

1. A method for microwave simultaneous glass solidification of radioactive thermal insulation wool and radioactive waste resin, characterized in that, The method comprises the following steps: 1) mixing radioactive insulation cotton with radioactive waste resin to obtain a radioactive mixture; 2) adding an additive to the radioactive mixture, then glass solidifying under microwave conditions, then keeping warm at 400-600°C for 1-3 h, and finally cooling to room temperature; In the step 1), the mass ratio of the radioactive insulation cotton to the radioactive waste resin is 2:1-2:3; The radioactive waste resin is ion exchange resin mixed from anion exchange resin and cation exchange resin; the volume ratio of the anion exchange resin to the cation exchange resin is 3:1-2:1; In the step 2), the mass ratio of the radioactive insulation cotton to the additive in the radioactive mixture is 48:1-12:1; and the additive is boric acid or sodium tetraborate.

2. The method of claim 1, wherein: The mass ratio of the radioactive insulation cotton to the radioactive waste resin is 1:

1.

3. The method of claim 1, wherein: The volume ratio of the anion exchange resin to the cation exchange resin is 2:

1.

4. The method of claim 1, wherein, In the radioactive mixture, the mass ratio of the radioactive insulation cotton to the additive is 24:

1.

5. The method of claim 1, wherein, In the step 2), the microwave treatment temperature is 1100-1400°C, and the microwave treatment time is 1-3 h.

6. The method of claim 5, wherein, In the step 2), the microwave treatment temperature is 1300°C, and the microwave treatment time is 3 h.

7. The method of claim 1, wherein, In the step 2), the keeping warm temperature is 500°C, and the keeping warm time is 1 h.

Images