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Uranium trioxide fluidized bed hydrogen reduction process

A uranium trioxide and fluidized bed technology, applied in the field of uranium trioxide fluidized bed hydrogen reduction technology

Active Publication Date: 2014-09-17
THE 404 COMPANY LIMITED CHINA NAT NUCLEAR
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The United Kingdom uses denitrification of UNH solution to prepare UO3, rehydration and activation, and hydrogen reduction to prepare UO2; however, the above-mentioned relevant process information is public

Method used

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  • Uranium trioxide fluidized bed hydrogen reduction process
  • Uranium trioxide fluidized bed hydrogen reduction process
  • Uranium trioxide fluidized bed hydrogen reduction process

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Embodiment Construction

[0024] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0025] According to the above process flow, establish a 100kgU / h process system and carry out an engineering test system.

[0026] At the temperatures of 550±10°C, 580±10°C, 600±10°C, 620±10°C, 640±10°C, the hydrogen excess is about 100% (based on 100kgU per hour), and the molar ratio of nitrogen to hydrogen is 1:3, and the reaction time was 8h, and the reduction reaction was carried out. The analysis results of product UO2 are shown in Table 1. From the data in Table 1, it can be known that as the temperature increases, the reduction conversion rate also increases. When it reaches 600±10°C, the reduction conversion rate of UO3 basically no longer increases, so the optimal reaction temperature is 600±10°C.

[0027] Table 1UO 3 The relationship between reduction conversion rate and temperature

[0028]

[0029] The reduction reaction was carried o...

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Abstract

The invention discloses a uranium trioxide fluidized bed hydrogen reduction process, which consists of the steps of test platform construction, gas mixing, feeding, reaction, discharge and exhaust gas emission, etc. The invention realizes the technological route of UO2 preparation by UO3 hydrogen reduction for the first time at home. In the route, the fluidized bed is selected as the reduction reactor, and has the advantages of excellent heat transfer performance, easy realization of uniform control of the bed temperature, simple structure, convenient maintenance and high production capacity. In addition, application of the fluidization technology can achieve full contact of a gas phase and a solid phase, strengthens mass transfer and heat transfer effects, and is easy to realize high reaction yield of materials.

Description

technical field [0001] The invention relates to the hydrogen reduction process technology of uranium trioxide fluidized bed in the field of uranium conversion, in particular to the process of generating uranium dioxide by reacting hydrogen gas prepared by electrolysis of hydrogen fluoride and uranium trioxide in a fluidized bed main reactor in the field of uranium conversion . Background technique [0002] As one of the main uranium conversion processes, at present, there are many technological routes for preparing UO2 by reducing UO3. However, in the conversion process of natural uranium, there are three main process routes that can be produced on a large scale and have practical application value: AUC pyrolysis reduction method, ADU calcination-reduction method, and UNH denitrification-reduction method. However, in the process of the first two methods, precipitants such as (NH4)2CO3, NH3, CO2 must be used, and a certain amount of waste liquid will be produced. However, t...

Claims

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Application Information

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IPC IPC(8): C01G43/025
Inventor 王俊王伟刘宾魏刚张慧忠严辉许云生邹琛华
Owner THE 404 COMPANY LIMITED CHINA NAT NUCLEAR
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