Method for preparing triuranium octaoxide from uranium hexafluoride

A technology of triuranium eight oxide and uranium hexafluoride, which is applied in the field of nuclear fuel cycle, can solve the problems of increasing fluorine content, large amount of waste water, and long wet process, and achieves low fluorine content, reduction of ammonia nitrogen waste water, and convenient The effect of long-term stable storage

Pending Publication Date: 2021-04-06
中核二七二铀业有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In production practice, the gas UF is usually 6 React with water vapor to produce UO 2 f 2 powder, and then prepare UO by "wet" ADU thermal decomposition reduction method or "dry" direct reduction 2 , but the wet process is long and the amount of wastewater is large, and the dry process produces UO 2 Will be hydrofluorinated by HF to UF 4 Plates are lumped and UO added 2 Fluorine content in

Method used

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  • Method for preparing triuranium octaoxide from uranium hexafluoride

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Uranyl solution: uranium 138.5g / L, fluorine 22.7g / L;

[0033] Step one, UO 2 f 2 Preparation of hydrolyzate;

[0034] The solid UF6 is heated and vaporized and slowly passed into the water washing equipment for hydrolysis reaction to prepare UO 2 f 2 solution.

[0035] Step two, UO 2 f 2 powder preparation;

[0036] Add a certain amount of hydrogen peroxide solution (mass concentration 30%) to the uranyl solution, react and then put the solution into the evaporator, slowly heat and concentrate to form UO 2 f 2 crystallized and subsequently baked into dry UO 2 f 2 Powder, the HF gas in the evaporation process is passed into the potassium hydroxide solution to prepare the by-product potassium bifluoride. The amount of hydrogen peroxide added to the reaction control is 10%, and the baking temperature is 150°C.

[0037] Step 3, roasting and preparing U 3 o 8 ;

[0038] Dry UO 2 f 2 The powder is placed in a roasting furnace and oxidized to U in an aerobic h...

Embodiment 2

[0041] Uranyl solution: uranium 138.5g / L, fluorine 22.7g / L

[0042] Step one, UO 2 f 2 Preparation of hydrolyzate;

[0043] The solid UF6 is heated and vaporized and slowly passed into the water washing equipment for hydrolysis reaction to prepare UO 2 f 2 solution.

[0044] Step two, UO 2 f 2 powder preparation;

[0045] Add a certain amount of hydrogen peroxide solution (mass concentration 30%) to the uranyl solution, react and then put the solution into the evaporator, slowly heat and concentrate to form UO 2 f 2 crystallized and subsequently baked into dry UO 2 f 2 Powder, the HF gas in the evaporation process is passed into the potassium hydroxide solution to prepare the by-product potassium bifluoride. The amount of hydrogen peroxide added for reaction control is 10%, and the baking temperature is 150°C;

[0046] Step 3, roasting and preparing U 3 o 8 ;

[0047] Dry UO 2 f 2 The powder is placed in a roasting furnace and oxidized to U in an aerobic high-...

Embodiment 3

[0050] Uranyl solution: uranium 138.5g / L, fluorine 22.7g / L

[0051] Step one, UO 2 f 2 Preparation of hydrolyzate;

[0052] The solid UF6 is heated and vaporized and slowly passed into the water washing equipment for hydrolysis reaction to prepare UO 2 f 2 solution.

[0053] Step two, UO 2 f 2 powder preparation;

[0054] Add a certain amount of hydrogen peroxide solution (mass concentration 30%) to the uranyl solution, react and then put the solution into the evaporator, slowly heat and concentrate to form UO 2 f 2 crystallized and subsequently baked into dry UO 2 f 2 Powder, the HF gas in the evaporation process is passed into the potassium hydroxide solution to prepare the by-product potassium bifluoride. The amount of hydrogen peroxide added for reaction control is 10%, and the baking temperature is 150°C;

[0055] Step 3, roasting and preparing U 3 o 8 ;

[0056] Dry UO 2 f 2 The powder is placed in a roasting furnace and oxidized to U in an aerobic high-...

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Abstract

The invention belonging to the technical field of nuclear fuel circulation, and particularly relates to a method for preparing triuranium octaoxide from uranium hexafluoride. The method comprises the following three steps: step 1, preparation of a UO2F2 hydrolysate; step 2, preparation of UO2F2 powder; step 3, roasting for preparation of U3O8. According to the method, the process of preparing U3O8 through conventional UF6 reduction is shortened, and the addition of ammonia water in the process is avoided, so ammonia nitrogen wastewater generated in the process is reduced, a preparation process is simple, cost is low, and industrialization is easy to realize. According to the method, a large amount of fluorine in UF6 is converted into HF acid through water, the HF acid reacts with potassium hydroxide to finally prepare a byproduct potassium hydrogen fluoride, and the byproduct potassium hydrogen fluoride can be returned to an electrolytic fluorine production unit in a uranium conversion system so as to realize recycling. The U3O8 prepared by the method is more uniform in granularity, good in powder flowability, low in radioactivity, low in fluorine content and convenient for long-term stable storage.

Description

technical field [0001] The invention belongs to the technical field of nuclear fuel cycle, and in particular relates to a method for preparing U3O8 from uranium hexafluoride. Background technique [0002] In the field of nuclear fuel cycle, mainly depleted UF 6 Preparation of depleted UF as feedstock 4 , UO 2 , U 3 o 8 Three kinds, and get the by-product - hydrofluoric acid. Among the three products, UF 4 It will react with water vapor in the air to generate HF to corrode the container; another UO 2 The powder is prone to spontaneous combustion and must be UO 2 Stored in the form of ceramics, but slow oxidation reactions still occur; and U 3 o 8 Although the density is the smallest, it can continue to be converted into UO 2 Or reuse of uranium metal. [0003] In production practice, the gas UF is usually 6 React with water vapor to produce UO 2 f 2 powder, and then prepare UO by "wet" ADU thermal decomposition reduction method or "dry" direct reduction 2 , but...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G43/01C01D3/02
CPCC01G43/01C01D3/02
Inventor 王剑卫胡锦明李帅宋传令欧阳毅陶伊玲
Owner 中核二七二铀业有限责任公司
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