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Method for producing triuranium octoxide by microwave calcination of ammonium diuranate

A technology of triuranium octaoxide and ammonium diuranate, which is applied in the field of microwave heating application and material preparation, can solve the problems of poor product uniformity, difficult processing, over-burning, etc., and achieve short production cycle, easy industrial application, product composition And the effect of uniform particle size

Inactive Publication Date: 2010-01-27
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the uneven temperature distribution on the same section of the calcination equipment, the production method has high energy consumption, poor product uniformity, easy occurrence of under-burning, over-burning, etc., which brings processing difficulties to subsequent processes; and more critical The most important thing is that the conventional electric kiln calcining ammonium diuranate process takes a long time, which will increase the risk of nuclear radiation threat

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1: The ammonium diuranate powder (product) with a particle size of 10-120 μm and the U3O8 powder (product) with a particle size of 10-150 μm are mechanically mixed at a mass percentage of 8:1, and 15 g of the mixed material is weighed and loaded into Put the alumina crucible in the microwave reactor; turn on the microwave heating switch, adjust the microwave output power to 10-15kW, raise the temperature of the material from room temperature to 450°C at a rate of 20°C / min, and keep it at this temperature for 25min; turn off the microwave Heating the switch, cooling down to room temperature naturally to obtain U3O8 product. After analysis and testing, the content of ∑U in U3O8 products is 84.67%, U 4+ The content is 28.24%.

Embodiment 2

[0020] Embodiment 2: the ammonium diuranate powder (product) with a particle size of 10-120 μm and the U3O8 powder (product) with a particle size of 10-150 μm is mechanically mixed at a mass percentage of 5:1, and 15 g of the mixed material is weighed and loaded into Put the alumina crucible in the microwave reactor; turn on the microwave heating switch, adjust the microwave output power to 20-25kW, raise the temperature of the material from room temperature to 550°C at a rate of 30°C / min, and keep it at this temperature for 15min; turn off the microwave Heating the switch, cooling down to room temperature naturally to obtain U3O8 product. After analysis and testing, the content of ∑U in U3O8 products is 84.85%, U 4+ The content is 28.61%.

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PUM

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Abstract

The invention relates to a method for producing triuranium octoxide by microwave calcination of ammonium diuranate, comprising the steps: evenly mixing ammonium diuranate and triuranium octoxide by weight percent of (10 to 2): 1 to obtain a mixed material; then putting the mixed material into a microwave reactor; regulating microwave output power to be 10 to 80 kW; room temperature of the material is raised to 350 DEG C to 800 DEG C at the rate of 20 to 100 DEG C / min; keeping the temperature for 10 to 40 min; and obtaining a triuranium octoxide product. In the method, a calcination product with strong wave absorbing performance is added to a calcination raw material with relatively weak wave absorbing performance; the microwave calcination of substances with weak wave absorbing performance is realized; and moreover, the method has short production period, low energy consumption and easy industrial application.

Description

1. Technical field [0001] The invention relates to a method for producing U3O8 by microwave calcining ammonium diuranate, which belongs to the technical field of microwave heating application and material preparation. 2. Background technology [0002] Uranium is the material basis for the development of the nuclear industry, and has great strategic significance for ensuring national security, energy security, and environmental security; Calcined uranium chemical concentrate - ammonium diuranate (ADU), the calcination process is a key link in the preparation of various types of nuclear fuel. [0003] The known calcination of ammonium diuranate usually adopts electrothermal calcination regardless of static calcination represented by tunnel kiln or semi-dynamic calcination represented by drum. Due to the uneven temperature distribution on the same section of the calcination equipment, the production method has high energy consumption, poor product uniformity, easy occurrence o...

Claims

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Application Information

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IPC IPC(8): C01G43/01
Inventor 彭金辉刘秉国张利波张泽彪张世敏郭胜惠周烈兴
Owner KUNMING UNIV OF SCI & TECH
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