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Novel process for preparing UF6 by direct hydrogen reduction dry method of U3O8

A direct and dry technology, applied in the field of natural uranium purification and transformation, can solve the problems of large front-end waste liquid, high system failure rate, long process flow, etc., and achieve the goal of reducing waste treatment volume, shortening process flow, and simplifying process flow Effect

Pending Publication Date: 2022-06-21
THE 404 COMPANY LIMITED CHINA NAT NUCLEAR
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Problems solved by technology

This process has disadvantages such as long process flow, complex process, high system failure rate, and large amount of waste liquid at the front end.

Method used

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  • Novel process for preparing UF6 by direct hydrogen reduction dry method of U3O8

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Embodiment Construction

[0019] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] By researching and conducting U 3 O 8 The hydrogen reduction activity test shows that uranium 88 can be directly reduced by hydrogen to form uranium dioxide. carry out U 3 O 8 Direct hydrogen reduction test, fluidization test and engineering application research, the results show that the U 3 O 8 Material and UO prepared by AUC thermal decomposition reduction, ADU thermal decomposition reduction, UNH denitration reduction 3 mixed (U 3 O 8 with UO 3 The mass mixing ratio can be controlled within the range of 0 to 0.85), and then the reduction fluidized bed hydrogen reduction to prepare UO 2 The feasibility of the process route, on this basis, further verify the denitrification UO 3 Add different proportions of U 3 O 8 UO after hydrogen reduction reaction 2 The influence of product quality on subsequent hydrofluorination and f...

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Abstract

The invention belongs to the technical field of purification and conversion of natural uranium, and particularly relates to a novel process for preparing UF6 through a U3O8 direct hydrogen reduction dry method. The method comprises the following steps: adding a U3O8 raw material and a denitration UO3 material, mixing, carrying out a reduction reaction in a reduction fluidized bed after mixing to prepare a UO2 material, carrying out a countercurrent fluidization reaction on anhydrous hydrogen fluoride and UO2 produced by reduction in the fluidized bed to prepare a UF4 product, and carrying out a fluorination reaction on uranium tetrafluoride and fluorine gas produced by hydrofluorination in a vertical fluorination reactor. And the UF6 product meeting the requirements is prepared. The uranium conversion production cost is reduced, waste liquid discharge is reduced, and a new thought is provided for preparation of uranium hexafluoride in the future.

Description

technical field [0001] The invention belongs to the technical field of natural uranium purification and transformation, and in particular relates to a U 3 O 8 Preparation of UF by Direct Hydrogen Reduction Dry Process 6 New process. Background technique [0002] Nuclear fuel is the basis for the development of the nuclear industry. The quantity, quality and production cost of its products are directly related to the development of the nuclear military industry, nuclear power and nuclear technology application industries. It is one of the symbols of a country's production technology level and comprehensive national strength. has a significant impact on its international status. Uranium conversion refers to the chemical conversion process of uranium and its compounds in the process of nuclear fuel production and recycling. It occupies a very important position in the nuclear industry and is an indispensable link in the nuclear fuel cycle. Since most of the nuclear power pl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G43/06
CPCC01G43/066
Inventor 王伟侯彦龙魏刚王俊马亮曹山冯秀燕孙玉鹤孙成龙任先锋冯怀权任喜彦刘亚斌李小为杨校铃包国强
Owner THE 404 COMPANY LIMITED CHINA NAT NUCLEAR
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