CN-121983368-A - A kind of buccal103Treatment method of alkaline radioactive waste liquid of Pd

Abstract

The invention discloses a method for treating alkaline radioactive waste liquid containing 103 Pd, and relates to the technical field of radioactive waste liquid treatment. The treatment method of the alkaline radioactive waste liquid containing 103 Pd comprises the following steps of S1, adding an oxidant into the alkaline radioactive waste liquid containing 103 Pd for oxidation treatment to obtain a first mixed solution, S2, mixing the first mixed solution with a palladium tetra-chloride solution to obtain a second mixed solution, adding an excessive reducing agent for full reaction, separating to obtain a treatment solution and a radioactive precipitate, and repeating the steps S1-S2 until the radioactivity of the treatment solution is the same as that of the background. The treatment method provided by the invention has good treatment effect, simple method and strong operability, 103 Pd in alkaline radioactive waste liquid is converted into solid, the radioactivity of the treated waste liquid is the same as that of background, the treated waste liquid can be used as common waste liquid for treatment, and the radioactive solid obtained after conversion has extremely small volume and is easier to store and decay.

Inventors

• LI ZHONGYONG
• GAO HUIBO
• ZHANG WENHUI

Assignees

• 原子高科股份有限公司

Dates

Publication Date

20260505

Application Date

20260120

Claims (10)

1. 1. A method for treating alkaline radioactive waste liquid containing 103 Pd is characterized by comprising the following steps: s1, adding an oxidant into alkaline radioactive waste liquid containing 103 Pd for oxidation treatment to obtain a first mixed solution; s2, mixing the first mixed solution with a palladium tetra-chloride solution to obtain a second mixed solution, adding an excessive reducing agent for full reaction, and separating to obtain a treatment solution and a radioactive precipitate; Repeating the steps S1-S2 until the radioactivity of the treatment solution is the same as the radioactivity of the background.
2. 2. The method for treating alkaline radioactive waste liquid containing 103 Pd according to claim 1, wherein the concentration of palladium in the second mixed solution in S2 is 4.7: 4.7 mmol/L or more.
3. 3. The method for treating alkaline radioactive waste liquid containing 103 Pd according to claim 1, wherein the concentration of palladium in the second mixed solution in S2 is 4.7-47 mmol/L.
4. 4. The method for treating alkaline radioactive waste liquid containing 103 Pd according to any one of claims 1 to 3, wherein the oxidizing agent in S1 is hydrogen peroxide.
5. 5. The method for treating alkaline radioactive waste liquid containing 103 Pd according to claim 4, wherein the hydrogen peroxide adding process in the alkaline radioactive waste liquid containing 103 Pd is monitored by a hydrogen peroxide test paper in S1, and the hydrogen peroxide is stopped when the hydrogen peroxide test paper shows positive.
6. 6. The method for treating alkaline radioactive waste liquid containing 103 Pd according to any one of claims 1 to 3, wherein the reducing agent in S2 is hydrazine hydrate.
7. 7. The method for treating alkaline radioactive waste liquid containing 103 Pd according to claim 6, wherein the amount of hydrazine hydrate added in S2 is 5 to 100 times the amount of substance of tetraamminepalladium dichloride based on the amount of substance.
8. 8. The method for treating alkaline radioactive waste liquid containing 103 Pd according to any one of claims 1-3, wherein the radioactive precipitate in S2 is subjected to acid dissolution and evaporation to dryness to obtain a radioactive solid substance, and the radioactive solid substance is stored and decayed to be non-radioactive and then is used for preparing a tetraamminepalladium dichloride solution for recycling in the S2 step.
9. 9. The method for treating alkaline radioactive waste liquid containing 103 Pd according to claim 8, wherein the acid dissolution is aqua regia dissolution, and the aqua regia dosage is 4-5 mL aqua regia per gram of radioactive precipitate.
10. 10. The method for treating alkaline radioactive waste liquid containing 103 Pd according to any one of claims 1 to 3, wherein the alkaline radioactive waste liquid containing 103 Pd is alkaline radioactive waste liquid after producing 103 Pd sealed seed source core by electroplating or electroless plating.

Description

Treatment method of alkaline radioactive waste liquid containing 103 Pd Technical Field The invention relates to the technical field of radioactive waste liquid treatment, in particular to a treatment method of alkaline radioactive waste liquid containing 103 Pd. Background Malignant tumor is a serious disease threatening human health, and the radiation sealing seed source is implanted into tumor tissue to perform brachytherapy, which is a new tumor treatment technology developed in recent decades. The radioactive nuclide in the radioactive sealed seed source emits rays when decaying, and the radioactive sealed seed source continuously irradiates tumor cells in a short distance, kills and kills the tumor cells, so that the tumor cells lose reproductive capacity and achieve the purposes of relieving and treating diseases. The technology is widely used for treating various tumors, such as prostate cancer, breast cancer, liver cancer, ovarian cancer, brain tumor, intraorbital tumor and the like, has good treatment effect, and has wide application prospect, and clinical practice proves that the technology is safe and reliable, has good curative effect and small damage to normal tissues. The radioactive sealed seed source for short-distance radiotherapy is also called seed source and radioactive particle, and is miniature radioactive source containing radioactive nuclide, and is composed of source core and cladding, the source core is microsphere or short bar containing radioactive nuclide, and the cladding is medical titanium tube with good biocompatibility. The two radionuclides most commonly used in radioactive sealed seed sources are 125 I and 103Pd.103 Pd half-life 17 days, 103m Rh decayed to the excited state by electron capture, followed by 103 Rh flyback to the steady state by gamma decay and conversion with electron capture and conversion emission of characteristic X-rays and auger electrons, wherein the characteristic energy peak 357.5 KeV, the primary photon energies 20.2 KeV and 22.7 KeV, the average radiation energy about 21 KeV, release 90% of the dose for 58 days, is suitable for the treatment of faster proliferation, Poorly differentiated tumors. 103 The Pd sealed seed source core is prepared by three main ways, namely a direct activation method, a physical adsorption method and a chemical method. The chemical method is mainly adopted, 103 Pd is deposited on the surface of a substrate to prepare a source core through electroplating or electroless plating, and then the source core is sealed in a titanium tube to obtain the 103 Pd sealed seed source. When 103 Pd sealing seed source cores are produced by electroplating or electroless plating, alkaline plating solution is generally adopted, palladium ammonia complex ions are used as main plating solution components, and the utilization rate of 103 Pd can be up to 99 percent, but the radioactivity remained in waste liquid generated after production still does not meet the solution control or emission requirements, even up to several millicuries per milliliter. The existing method usually comprises the steps of collecting the waste liquid, storing and decaying the waste liquid for at least 3-10 half-lives until the waste liquid is free of radioactivity, and then treating the waste liquid as common waste liquid. Although the amount of waste liquid generated after 103 Pd is sealed with the seed source core is less and is only a few milliliters to tens milliliters, a large amount of radioactive waste liquid still accumulates during continuous production, if a storage decay treatment mode is adopted, the radioactive waste liquid needs to be collected in a special radioactive waste liquid storage container and stored in a radioactive waste warehouse for decay, the storage decay time is long, a larger storage capacity needs to be occupied, and higher safety measures and higher cost or cost need to be adopted. Less researches are focused on the treatment of radioactive waste liquid containing 103 Pd, mainly in the field of treating high-level radioactive waste liquid generated by nuclear fuel post-treatment, and in addition, there are various treatment methods for non-radioactive palladium-containing waste liquid in the industrial field, but the purpose of the prior art is mainly to recover noble metal palladium in the waste liquid, and organic matters or solid materials are introduced as solvents, extractants, adsorbents and the like for treating the radioactive waste liquid containing 103 Pd, so that additional radioactive organic waste liquid, radioactive solid waste or additional waste liquid or waste containing different components can be generated, therefore, the prior art is not suitable for treating the radioactive waste liquid containing 103 Pd, and is not suitable for treating alkaline radioactive waste liquid generated after 103 Pd is produced by electroplating or electroless plating to seal seed source cores. Disclosure of Invention In o