Device and method for preparing tetravalent uranium by dynamic membrane electrolysis

A technology of tetravalent uranium and dynamic membrane, which is applied in the direction of electrolysis process, electrolysis components, electrode shape/type, etc., can solve the problems of long electrolysis time, undisclosed tetravalent uranium reduction rate, device diagram, and low current density, etc., to achieve Low oxygen overpotential, good mechanical strength, and low resistance

Active Publication Date: 2012-07-04
CHINA INSTITUTE OF ATOMIC ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current density is small, the electrolysis time is long, the reduction rate of tetravalent uranium and the device diagram are not disclosed

Method used

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  • Device and method for preparing tetravalent uranium by dynamic membrane electrolysis
  • Device and method for preparing tetravalent uranium by dynamic membrane electrolysis
  • Device and method for preparing tetravalent uranium by dynamic membrane electrolysis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Such as figure 1 with figure 2 As shown, a device for preparing tetravalent uranium by dynamic membrane electrolysis, the device consists of cation exchange membrane (1), anode (2), cathode (3), anolyte (4), catholyte (5), peristaltic pump ( 6), gasket a (7), electrode frame a (8), anolyte outlet (9), catholyte outlet (10), anolyte inlet (11), catholyte inlet (12), electrode frame b (13 ), gasket b (14), wherein, from left to right, the device is electrode frame a (8), gasket a (7), cation exchange membrane (1), gasket b (14), electrode frame b(13), they form a sealed space layer by layer; liner a(7) and liner b(14) are quadrilateral structures; electrode frame a(8) is a hollow frame structure, and electrode frame a(8) ) is equipped with an anode (2), an anolyte inlet (11) is left at the lower end of the electrode frame a (8), and an anolyte outlet (9) is left at the upper end of the electrode frame a (8); the electrode frame b ( 13) is a hollow frame structure, a c...

Embodiment 2

[0027] The device of Example 1 was used, wherein the distance between the cathode and the anode was 10 mm.

[0028] The composition of catholyte is: uranyl nitrate 197g / L, nitric acid 4.1mol / L, hydrazine 0.18mol / L; anolyte is 2.5mol / L nitric acid solution. The catholyte of 500ml and the anolyte of 500ml are both circulated at a flow rate of 300ml / min under the delivery of the peristaltic pump. Apply a current of 7.20A (100mA / cm 2 ), after 4.5 hours of electrolysis, the tetravalent uranium content in the catholyte reached 96%, the nitric acid concentration was 2.1mol / L, the hydrazine concentration was 0.062mol / L, and the feed liquid temperature was 38°C (room temperature 33°C).

Embodiment 3

[0030] The device of Example 1 was used, wherein the distance between the cathode and the anode was 15 mm.

[0031] The composition of catholyte is: uranyl nitrate 199g / L, nitric acid 2.2mol / L, hydrazine 0.52mol / L; anolyte is 2.5mol / L nitric acid solution. The catholyte of 500ml and the anolyte of 500ml are both circulated at a flow rate of 400ml / min under the delivery of the peristaltic pump. Apply a current of 8.64A (120mA / cm 2 ), after 3 hours of electrolysis, the tetravalent uranium content in the catholyte reached 93.1%, the nitric acid concentration was 0.7mol / L, the hydrazine concentration was 0.3mol / L, and the feed liquid temperature was 42°C (room temperature 28°C).

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Abstract

The invention belongs to the field of nuclear fuel reprocessing, and in particular relates to a device and a method for preparing tetravalent uranium by dynamic membrane electrolysis. The device consists of a cation exchange membrane, an anode, a cathode, anolyte, catholyte, a peristaltic pump, a gasket a, an electrode frame a, an anolyte outlet, a catholyte outlet, an anolyte inlet, a catholyte inlet, an electrode frame b and a gasket b, wherein the electrode frame a, the gasket a, the cation exchange membrane, the gasket b and the electrode frame b are arranged on the device from left to right and superposed layer upon layer to form a sealed space; each of the gasket a and the gasket b has a quadrilateral structure; the anode is a titanium-coated ruthenium iridium mesh; the cathode is a titanium mesh; the distance between the cathode and the anode is 6 to 15mm; and the cation exchange membrane is a perfluorosulfonated cation exchange membrane. By the device and the method for preparing the tetravalent uranium by dynamic membrane electrolysis, the content of the tetravalent uranium in a product is ensured, and the tetravalent uranium can be stably and quickly prepared; and the device has a simple structure.

Description

technical field [0001] The invention belongs to the field of post-processing of nuclear fuel, and in particular relates to a device and method for preparing tetravalent uranium by dynamic membrane electrolysis. Background technique [0002] In the Purex process, tetravalent uranium is usually used as a reducing agent, and hydrazine is used as a supporting reducing agent to reduce plutonium from tetravalent to trivalent, thereby realizing the separation between co-extracted uranium and plutonium. But the added tetravalent uranium solution will cause the dilution of the plutonium product and increase the burden on the uranium line. Minimizing these effects requires the use of highly concentrated reductant solutions with high tetravalent uranium content. Therefore, it is of great significance to prepare a solution with high concentration and high tetravalent uranium content. [0003] Existing technology 1: "Research on Preparation of Tetravalent Uranium by Diaphragm Electroly...

Claims

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Application Information

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IPC IPC(8): C25B1/00C25B9/10C25B11/03C25B9/23
Inventor 袁中伟郑卫芳晏太红张宇卞晓艳左臣李传博
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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