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Method for directly preparing UO2 from sodium diuranate (Na2U2O7)

A technology of na2u2o7 and sodium uranate, which is applied in the field of preparing UO2 from sodium diuranate, can solve the problems of complex process and cumbersome process, and achieve the effect of simplifying the process and saving the number of equipment

Active Publication Date: 2021-06-25
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the current Na 2 u 2 o 7 Preparation of UO 2 Process is loaded down with trivial details, technical complexity problem, and provide a kind of sodium diuranate (Na 2 u 2 o 7 ) to directly prepare UO 2 Methods

Method used

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  • Method for directly preparing UO2 from sodium diuranate (Na2U2O7)
  • Method for directly preparing UO2 from sodium diuranate (Na2U2O7)
  • Method for directly preparing UO2 from sodium diuranate (Na2U2O7)

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preparation example Construction

[0019] The preparation of reducing agent Al-Li alloy: the device for preparing Al-(5~10wt.%) Li alloy is as figure 1 As shown, the device includes: a DC power supply, a tungsten wire, a graphite rod, a sleeve, and a crucible. First, put evenly mixed LiCl-KCl (mass ratio 38:45) salt into the crucible, heat and melt it in a pit furnace and raise the temperature to 660°C, use liquid aluminum as the cathode, graphite rod as the anode, and pass through 0.1~5A ( The Al-(5-10wt.%) Li alloy is prepared by electrolysis at a cell voltage of 3.6-5V), and an excess of 3-5 times the metal Li is generated to ensure that the subsequent addition of Na 2 u 2 o 7 The powder is fully restored. After the electrolysis is completed, the tungsten wire and graphite rod are withdrawn from the crucible.

[0020] Metal aluminum is melted at the bottom of the molten salt as the cathode and connected to the negative pole of the DC power supply through the tungsten wire covered by the sleeve, and the g...

Embodiment

[0026] (1) Preparation of reducing agent Al-(8wt.%) Li alloy

[0027] The experimental device for preparing Al-Li alloy in the embodiment is as figure 1 As shown, the experimental device includes: DC power supply, tungsten wire, graphite rod, corundum sleeve, alumina crucible. Put the dried LiCl-KCl (38g: 45g) mixed salt in an alumina crucible, melt and stabilize it in a well furnace at 660°C, put 3g of metal aluminum into the molten salt and melt it, then polish it brightly and use corundum The tungsten wire protected by the sleeve is inserted into the liquid aluminum to form the liquid cathode, and the spectrally pure graphite rod that has been boiled and dried with hydrochloric acid and covered with the corundum sleeve is inserted into the molten salt as the anode. After the cathode and anode are connected to a direct current power supply, a constant current of 1A is selected for electrolysis for 1 hour to prepare an Al-(8wt.%)Li alloy. After the electrolysis is completed...

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Abstract

The invention provides a method for preparing UO2 by directly reducing Na2U2O7 by using an Al-Li alloy. The method comprises the following steps: electrolyzing in LiCl-KCl molten salt to prepare Al-Li alloy, ensuring that excessive metal lithium is generated for reduction reaction, then adding dried Na2U2O7 powder, reducing Na2U2O7 by using the metal lithium to obtain a UO2 product, and promoting the reduction reaction by stirring. According to the method, the yield of UO2 can reach 88.1%, the processes of dissolving Na2U2O7, precipitating (NH4) 2U2O7 and calcining (NH4) 2U2O7 to prepare U3O8 are omitted, the number of devices is reduced, the technological process is simplified, the reduction process can be carried out in the air atmosphere, and used fused salt and Al alloy can be recycled.

Description

technical field [0001] The present invention relates to a kind of sodium diuranate (Na 2 u 2 o 7 ) to prepare UO 2 The method belongs to the field of nuclear technology. Background technique [0002] Uranium dioxide (UO 2 ) fuel is the current mainstream nuclear fuel. Because of UO 2 It has the characteristics of no anisotropic deformation under strong irradiation, no change in lattice structure at high temperature, no volatilization and no chemical reaction with water, and has been widely used in the manufacture of reactor fuel elements. [0003] In the course of the development of the uranium ore processing industry, various methods for preparing uranium concentrates have been studied, and the most widely used method is the precipitation method. Precipitation methods include precipitation of uranium in acidic solution and precipitation of uranium in alkaline solution. Among them, commonly used alkaline solutions such as alkaline immersion solution, Na in the ion ex...

Claims

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Application Information

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IPC IPC(8): C01G43/025C25C3/36
CPCC01G43/025C25C3/36C01P2002/72Y02E30/30
Inventor 韩伟赵英才李梅王一杰李海明刘汝庚孙扬
Owner HARBIN ENG UNIV
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