Technical method for absorbing palladium from high-level radioactive waste liquid

A technology of high-level radioactive waste liquid and process method, which is applied to the improvement of process efficiency, nuclear engineering, radioactive purification, etc. It can solve the problems of relatively few reports on palladium extraction, low efficiency of metal palladium adsorption treatment, and high impurity content, and achieve strong Effects of adsorption capacity, highly selective adsorption, and efficient spatial structure

Inactive Publication Date: 2016-10-26
湖州奇奇机电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the 1960s, researchers at home and abroad have carried out a lot of research and proposed many new processes, but at present most of them are aimed at the palladium extraction of the hydrochloric acid system, and there are relatively few reports on the palladium extraction of the nitric acid system. few
Moreover, most of the extractant systems used have some shortcomings, which make the adsorption treatment efficiency of metal palladium low and the impurity content is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Under the protection of nitrogen, dissolve 160g of 1,4,8,12-tetraazacyclopentadecane (14-N-4), 350g of potassium iodide and 600g of potassium carbonate in an organic solvent, stir well, and then add 100g of mesoporous silica with base structure, continue stirring and reflux reaction for 36-48h, after the reaction is completed, cool to room temperature, filter and separate the product, wash and dry for 12-18h, and obtain the modified mesoporous silica adsorbent; Add 7-10g of adsorbent to 1L of simulated high-level radioactive waste liquid. After ultrasonication for 10 minutes, control the temperature at 25°C and shake at a speed of 200r / min until the adsorption equilibrium is reached, and filter out the adsorbent.

[0024] Use atomic absorption spectrometry to measure the palladium content of the remaining clear liquid, and calculate the adsorption rate of the adsorbent to palladium according to the adsorption equilibrium formula to be 81.3%.

Embodiment 2

[0026] Under the protection of nitrogen, dissolve 150g of 1,4,8,12-tetraazacyclopentadecane (14-N-4), 380g of potassium iodide and 800g of potassium carbonate in an organic solvent, stir well, and then add base structure of mesoporous silica 100g, continue to stir and reflux reaction for 42h, after the reaction is completed, cool to room temperature, filter and separate the product, wash and dry for 16h, the obtained modified mesoporous silica adsorbent; Add 10g of adsorbent to the liquid, and after ultrasonication for 10min, control the temperature at 25°C and shake at a speed of 200r / min until the adsorption equilibrium is reached, then filter and remove the adsorbent; put the adsorbent that has adsorbed palladium into 1% thiourea Desorb in nitric acid solution to obtain palladium-containing solution, and the adsorbent can be recycled after treatment.

[0027] Use the atomic absorption spectrometry to measure the palladium content in the remaining clear liquid, and calculate...

Embodiment 3

[0029] Under nitrogen protection, 170g of 1,4,7,10,13-pentaazacyclopentadecane (15-N-5), 360g of potassium iodide and 700g of potassium carbonate were dissolved in an organic solvent, stirred evenly, and then added 100g of mesoporous silica with terminal chlorine group structure, continue stirring and reflux reaction for 48h, after the reaction is completed, cool to room temperature, filter and separate the product, wash and dry for 18h, the obtained modified mesoporous silica adsorbent; Add 10g of adsorbent to the waste liquid, and after ultrasonication for 10min, control the temperature at 25°C and oscillate at a speed of 200r / min until the adsorption equilibrium is reached, then filter and remove the adsorbent; put the adsorbent that has absorbed palladium into 1% Desorb in thiourea nitric acid solution to obtain a palladium-containing solution, and the adsorbent can be recycled after treatment.

[0030] Use atomic absorption spectrometry to measure the palladium content of...

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PUM

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Abstract

The invention provides a technical method for absorbing palladium from a high-level radioactive waste liquid. According to the technology, an absorbent is prepared by use of a novel preparation method, through adding the absorbent into the high-level radioactive waste liquid, after ultrasonic processing for 10 minutes, a temperature is controlled at 25 DEG C, oscillation is performed at a speed of 200r / min until an absorption balance is realized, after the absorbent is filtered and taken out, the palladium is absorbed from the high-level radioactive waste liquid. The method, by use of the novel adsorbent preparation method, can effectively absorb the metal palladium from the high-level radioactive waste liquid so as to realize absorptive utilization of the palladium metal.

Description

technical field [0001] The invention relates to the technical field of waste post-treatment, in particular to a process for adsorbing palladium from high-level radioactive waste liquid. Background technique [0002] In a nuclear reactor, nuclear fuel will produce a large amount of metal palladium during the fission process, and the content of metal palladium will vary depending on the type of reactor and the burnup. For example, a fast breeder reactor with a burnup of 80GWd / t will produce about 4.34Kg of palladium, while a pressurized water reactor with a burnup of 33GWd / t will produce about 1.33Kg of palladium. After the spent fuel is reprocessed, most of the palladium will enter the high-level waste liquid. [0003] Palladium is a precious metal that plays an important role in modern high-tech industry, modern industry and military industry. In addition, palladium is an efficient and versatile catalyst, which plays an indispensable role in chemical reactions. However, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21F9/12C22B7/00C22B11/00
CPCC22B7/005C22B11/00G21F9/12Y02P10/20
Inventor 王文庆
Owner 湖州奇奇机电科技有限公司
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