Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Preparation method of nuclear-grade pure uranium tetrafluoride

A pure uranium tetrafluoride, nuclear-grade technology, applied in the field of nuclear-grade pure uranium tetrafluoride preparation, can solve the problems of long process flow, large amount of waste water, high energy consumption, etc., and achieve the effect of cost reduction and environmental protection preparation

Pending Publication Date: 2021-02-26
中核二七二铀业有限责任公司
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the above deficiencies, the purpose of the present invention is to provide a new method for preparing nuclear-grade pure uranium tetrafluoride, which solves the problems of long technical process, high energy consumption, and To solve the problems of high reagent consumption, large amount of waste water, and high environmental protection costs, and achieve the purpose of reducing costs and environmental protection to prepare nuclear-grade uranium tetrafluoride

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method of nuclear-grade pure uranium tetrafluoride

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0022] A method for preparing nuclear-grade pure uranium tetrafluoride, comprising the steps of:

[0023] Step 1, ammonium diuranate pretreatment

[0024] Add ammonium diuranate to a microwave dryer for drying.

[0025] Step two, ammonium fluoride pretreatment

[0026] Ammonium fluoride is added to the reaction kettle, and it is thermally decomposed under high temperature conditions to produce a mixed gas of hydrogen fluoride and ammonia. preprocessing.

[0027] Step 3: Fluidized bed preparation of UF4

[0028] The ammonium diuranate pretreated in step one and the mixed gas of hydrogen fluoride and ammonia pretreated in step two are prepared in a bipolar series countercurrent fluidized bed to produce uranium tetrafluoride (the product quality meets the EJ / T990-96 standard), Exhaust gas enters the exhaust gas absorption system.

[0029] The moisture in the ammonium diuranate described in the first step is 200 mesh.

[0030] The decomposition temperature of the ammonium fl...

Embodiment 1

[0033] Add 450kg of ammonium diuranate to a microwave dryer for drying, and then add it to a fluidized bed silo after drying. Add hydrogen fluoride into the reactor, the temperature of the reactor is 130°C, and the pressure is 0.40Mpa. The pressure in the buffer tank is 0.30Mpa, and the temperature of the gas heater is 460°C.

[0034] The temperature of the primary fluidized bed is 480°C, the pressure is 80kpa, and the intake volume of the mixed gas of hydrogen fluoride and ammonia is 47m 3 / h. The temperature of the intermediate hopper is 370°C and the pressure is 16kpa. The temperature of the secondary fluidized bed is 430°C, the pressure is 120kpa, and the intake volume of the mixed gas of hydrogen fluoride and ammonia is 55m 3 / h.

Embodiment 2

[0036] Add 400kg of ammonium diuranate into a microwave dryer for drying, and then add it to a fluidized bed silo after drying. Add hydrogen fluoride into the reactor, the temperature of the reactor is 150°C, and the pressure is 0.45Mpa. The pressure in the buffer tank is 0.35Mpa, and the temperature of the gas heater is 480°C.

[0037] The temperature of the primary fluidized bed is 490°C, the pressure is 90kpa, and the intake volume of the mixed gas of hydrogen fluoride and ammonia is 49m 3 / h. The temperature of the intermediate hopper is 375°C and the pressure is 16kpa. The temperature of the secondary fluidized bed is 420°C, the pressure is 110kpa, and the intake volume of the mixed gas of hydrogen fluoride and ammonia is 50m 3 / h.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention belongs to the technical field of nuclear fuel manufacturing, and particularly relates to a novel method for preparing nuclear-grade pure uranium tetrafluoride. The method comprises thefollowing steps: step 1, pretreating ammonium diuranate, step 2, pretreating ammonium fluoride, and step 3, preparing uranium tetrafluoride by a fluidized bed. Uranium diuranate is used as a raw material, and ammonium diuranate is pretreated through drying, so that ammonium fluoride is thermally decomposed under a high-temperature condition, and mixed gas of hydrogen fluoride and ammonia gas is prepared. Then the pretreated ammonium diuranate and ammonium fluoride are subjected to thermal decomposition to prepare mixed gas of hydrogen fluoride and ammonia gas, uranium tetrafluoride is preparedin a fluidized bed, and the purposes of cost reduction and environment-friendly preparation of nuclear-grade uranium tetrafluoride can be achieved.

Description

technical field [0001] The invention belongs to the technical field of nuclear fuel manufacture, and in particular relates to a method for preparing nuclear-grade pure uranium tetrafluoride. Background technique [0002] The uranium nuclear fuel cycle mainly includes several processes such as uranium mining and hydrometallurgy processing, uranium purification and conversion, isotope separation, and spent fuel reprocessing. [0003] Purification of uranium is to prepare the raw solution by dissolving uranium chemical concentrate in nitric acid. After extraction, stripping and other processes, the refined uranyl nitrate solution is obtained after purification, and then the uranyl nitrate is converted into uranium oxide by denitrification. At present, there are two main types of uranium oxides prepared by denitration methods at home and abroad, namely chemical denitration method (ie wet denitration method) and thermal denitration method (dry method). [0004] Chemical denitrif...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C01G43/06
CPCC01G43/06
Inventor 胡锦明李帅陈建堂邹发王岳孙斌胡港张希
Owner 中核二七二铀业有限责任公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com