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Method for producing uranium trioxide by microwave heating uranyl nitrate solution

A technology of uranyl nitrate and microwave heating, applied in the direction of uranium oxide/hydroxide, can solve the problems of nozzle scarring, cumbersome operation, affecting the normal operation of product quality equipment, etc., to reduce material retention and avoid splashing. Effect

Active Publication Date: 2017-12-15
RES INST OF PHYSICAL & CHEM ENG OF NUCLEAR IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The wet method has serious disadvantages such as large consumption of reagents, a large amount of equipment and pipelines, many processes, cumbersome operations, difficulty in realizing automation and remote control, and a large amount of waste liquid.
The fluidized bed method commonly used in the dry method is prone to phenomena such as "bed vibration", material lumps, "wet bed", nozzle clogging and nozzle scarring, which affect product quality and normal operation of equipment. The amount of exhaust gas is large and the exhaust gas is carried Easy to cause loss of powder

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Select a uranyl nitrate solution with a volume of 1.5 L, containing about 350 g of uranium, and a nitric acid concentration of 3.5 mol / L.

[0045] Continuously transport the above-mentioned uranyl nitrate solution to the 2L denitrification tank in the microwave resonant cavity through a metering pump, set the microwave power to 1KW, heat, control the concentration temperature by PID to not exceed 130°C, and heat and evaporate for 100min.

[0046] The denitrification temperature is controlled by PID to not exceed 250°C, and the denitration time is 30 minutes.

[0047] The denitrified material was taken out and put into a ceramic fiber muffle furnace to stabilize at a temperature of 350° C. for 4 hours. After cooling, the material was taken out. The weight of the material was 577.6 g.

[0048] Add 172g of corundum balls into the denitrification tank, and make powder under the condition of ball mill speed 300rpm. After pulverization, take out 576.1g of powder material, 1....

Embodiment 2

[0050] Select a uranyl nitrate solution with a volume of 5.6L, containing 147g of uranium, and a nitric acid concentration of 0.6mol / L.

[0051] Continuously transport the above-mentioned uranyl nitrate solution to the 1.8L denitrification tank in the microwave resonant cavity through a metering pump, set the microwave power to 700W, heat, control the concentration temperature by PID to not exceed 130°C, and heat and evaporate for 8.9h.

[0052] The denitration temperature is controlled by PID to not exceed 250°C, and the denitration time is 23 minutes.

[0053] The denitrified material was taken out and placed in a ceramic fiber muffle furnace to stabilize at a temperature of 350° C. for 2 hours. After cooling, the material was taken out. The weight of the material was 244.1 g.

[0054] Add 117g of corundum balls into the denitrification tank, and make powder under the condition of ball mill speed 300rpm. After pulverization, take out 243.3g of powder material, 0.78g of mate...

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PUM

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Abstract

The invention discloses a method for producing uranium trioxide by heating uranyl nitrate solution in a microwave manner. The method comprises the following steps: delivering the uranyl nitrate solution as a raw material; and carrying out explosive evaporation of the uranyl nitrate solution, concentrating, decomposing uranyl nitrate to remove nitrate, stopping micro-wave heating,, placing materials in a muffle furnace, and ball-milling to obtain powder so as to obtain uranium trioxide powder. In the concentrating process, the temperature is controlled by adjusting micro-wave power, and the solution is prevented from splashing and overflowing; in a nitrate removing process, the temperature and the heating time are controlled, and the circumstance that triuranium octaoxide is generated due to over-high temperature is avoided; nitrate removing products are stable in a muffle furnace at the temperature of 350 DEG C, and the uranium trioxide conversion rate reaches 100%. By the method of ball-milling to obtain the powder, the powdery uranium trioxide is prepared, meanwhile, materials adhered to walls can be ground, and therefore, the retention amount of the materials in a container is reduced.

Description

technical field [0001] The invention belongs to the field of nuclear fuel cycle uranium conversion technology and microwave heating application, and specifically relates to a method for producing uranium trioxide by microwave heating uranyl nitrate solution. Background technique [0002] In the field of nuclear fuel production, uranium trioxide is used as an intermediate product for the production of uranium dioxide and uranium tetrafluoride, and the methods used in industry are precipitation method (wet method) or direct denitrification method of uranyl nitrate (dry method). The wet method has serious disadvantages such as large consumption of reagents, a large amount of equipment and pipelines, many processes, cumbersome operations, difficulty in realizing automation and remote control, and a large amount of waste liquid. The fluidized bed method commonly used in the dry method is prone to phenomena such as "bed vibration", material lumps, "wet bed", nozzle clogging and no...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G43/01
CPCC01G43/01
Inventor 赵刚于震刘庆凯许文强
Owner RES INST OF PHYSICAL & CHEM ENG OF NUCLEAR IND