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Uranium and plutonium separation technology in Purex process

A process and process technology, applied in the field of uranium-plutonium separation process, can solve the problems of use restriction and restriction of Purex process improvement, and achieve the effects of avoiding interference, simplifying the post-processing process, and reducing the difficulty of valence adjustment

Active Publication Date: 2015-04-29
CHINA INSTITUTE OF ATOMIC ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

but since N 2 h 4 with HNO 2 The azido acid produced by the reaction may cause an explosion, so N 2 h 4 The use of is limited, thereby limiting the process improvement of the Purex process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A separation process for uranium and plutonium in the Purex process. This process uses reducing agent 1BX and supplementary extraction agent 1BS to reduce Pu(IV) in 1BF feed liquid to Pu(III) in 1B tank, so that plutonium enters the water phase The uranium remains in the organic phase to realize the separation of uranium and plutonium. The composition of the reducing agent 1BX used is: 0.1mol / L N-hydroxyl-1-hydrazine carbonamide, 0.35mol / L NO 3 - and 0.35mol / L of H + , supplementary extractant 1BS contains 0.6mol / LHNO 3 30% TBP-kerosene, where the flow ratio of 1BF:1BX is 1, the flow ratio of 1BF:1BS is 1, and the temperature of tank 1B is 25°C.

Embodiment 2

[0023] The method and equipment used in Example 1 are the same, except that the used reducing agent 1BX consists of: 0.15mol / L of N-hydroxyl-1-hydrazine carboxamide, 0.4mol / L of NO 3- and 0.4mol / L of H + , supplementary extractant 1BS contains 1mol / LHNO 3 30% TBP-kerosene, wherein the flow ratio of 1BF:1BX is 3, the flow ratio of 1BF:1BS is 4, and the temperature of tank 1B is 30°C.

Embodiment 3

[0025] The method and equipment used in Example 1 are the same, except that the used reducing agent 1BX consists of: 0.2mol / L N-hydroxyl-1-hydrazine carboxamide, 0.5mol / L NO 3- and 0.5mol / L of H + , The supplementary agent 1BS is 30% TBP-kerosene containing 1mol / LHNO3, wherein the flow ratio of 1BF:1BX is 6, the flow ratio of 1BF:1BS is 6, and the temperature of tank 1B is 40°C.

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Abstract

The invention belongs to the technical field of irradiated fuel reprocessing and discloses a uranium and plutonium separation technology in a Purex process. According to the technology, in a 1B tank, a reducing agent 1BX and a fill extraction agent 1BS are used for reducing Pu (IV) in 1BF feed liquid into Pu (III), so that plutonium enters a water phase, and uranium is reserved in an organic phase; therefore, the uranium and the plutonium are separated. The used reducing agent 1BX comprises 0.1-0.2mol / L of N-hydroxyl-1-hydrazine carbomite, 0.35-0.5mol / L of NO<3-> and 0.35-0.5mol / L of H<+>; the fill extraction agent 1BS is 30% TBP- kerosene containing 0.6-1mol / LHNO3. The technology has the characteristics of high plutonium yield, good uranium and plutonium separation effect and high technology safety factor without needing adding a holding reducing agent.

Description

technical field [0001] The invention belongs to the technical field of spent fuel reprocessing, and in particular relates to a process for separating uranium and plutonium in a Purex process. Background technique [0002] The separation of uranium and plutonium is an important part of the Purex process. Its main task is to reduce Pu(IV) to Pu(III), which is extremely difficult to be extracted, allows plutonium to enter the water phase while uranium remains in the organic phase, realizing the separation of uranium and plutonium. Because organic chemical reagents have the characteristics of fast reaction speed, good selectivity, no introduction of salt, and easy destruction, a lot of research has been carried out in the application of uranium and plutonium separation. Among them, N, N-dimethylhydroxylamine, N, N-ethyl hydroxyethyl hydroxylamine, hydroxyurea, acetohydroxamic acid, etc. can be used as reducing agents in the separation of uranium and plutonium, and have achieved...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B60/02C22B60/04C22B3/44
Inventor 肖松涛刘协春罗方祥杨贺兰天孟照凯
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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