Method for producing triuranium octoxide by calcining ammonium uranyl tricarbonate with microwaves

A technology of uranyl ammonium tricarbonate and uranium octaoxide, which is applied in the direction of uranium oxide/hydroxide, can solve the problems of increased nuclear radiation threat probability, poor product uniformity, difficult processing and other problems, and achieves broad industrial application prospects , Short production cycle, uniform product composition and particle size

Inactive Publication Date: 2010-01-20
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
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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 uranyl tricarbonate process takes a long time, which will lead to an increase in the risk of nuclear radiation threats

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1: the ammonium uranyl tricarbonate that 15g particle diameter is 80-120 μ m is packed into an alumina crucible and placed in a microwave reactor, and the microwave output power is adjusted to 5-15kW. The temperature was raised to 400°C at a rate of °C / min, and kept at this temperature for 25 minutes, the microwave heating switch was turned off, and the product was naturally cooled to room temperature to obtain the U3O8 product. After analysis and testing, the content of ∑U in U3O8 products is 84.55%, U 4+ The content is 27.91%.

Embodiment 2

[0022] Example 2: Put 10 g of ammonium uranyl tricarbonate with a particle size of 40-80 μm into an alumina crucible and place it in a microwave reactor, adjust the microwave output power to 20-35kW, and transfer the material from room temperature at a rate of 30°C / min The temperature was raised to 600°C, and kept at this temperature for 15 minutes; the microwave heating switch was turned off, and naturally cooled to room temperature to obtain U3O8 product. After analysis and testing, the content of ∑U in U3O8 products is 84.72%, U 4+ The content is 28.11%.

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Abstract

The invention discloses a method for producing triuranium octoxide by calcining ammonium uranyl tricarbonate with microwaves, which comprises the following steps: putting ammonium uranyl tricarbonate into a microwave reactor, turning on a microwave heating switch, adjusting the microwave output power to 5-60kW, heating the materials to 400-700 DEG C from room temperature at the speed of 20-100 DEG C/minute, preserving heat for 5-30 minutes, and then naturally cooling to the room temperature to acquire a triuranium octoxide product. The production method has low energy consumption as well as uniform product ingredients and granularity, and the calcining time in the whole technical process is only one third of a conventional method.

Description

1. Technical field [0001] The invention relates to a method for producing U3O8 by microwave calcining ammonium uranyl tricarbonate, and belongs to the technical field of microwave heating application and material preparation. 2. Background technology [0002] As a clean and efficient new energy source, nuclear energy occupies an important position in the national energy strategy. At present, with the increasing demand for energy and the increasing shortage of traditional energy sources, the problems of small-scale nuclear energy development and weak industrial capacity in my country have become increasingly prominent. Therefore, it is extremely urgent to develop an efficient nuclear energy industry and improve my country's comprehensive economic strength and industrialization technology level. [0003] In the production process of uranium nuclear fuel, U3O8 is the measurement benchmark of uranium product output. It is mainly obtained by calcining uranium chemical concentra...

Claims

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Application Information

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