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Method for producing uranium trioxide by heating uranyl nitrate solution in microwave manner

A technology of uranyl nitrate and microwave heating, applied in the direction of uranium oxide/hydroxide, can solve the problems of complicated operation, scarring of nozzles, large consumption of reagents, etc., to avoid splashing and reduce the amount of material retention.

Active Publication Date: 2017-05-10
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

[0030] The volume of uranyl nitrate solution was 1.5 L, containing about 350 g of uranium, and the concentration of nitric acid was 3.5 mol / L.

[0031] The above-mentioned uranyl nitrate solution was continuously transported to the 2 L denitration tank in the microwave resonant cavity through a metering pump, and the microwave power was set to 1 KW for heating.

[0032] The denitration temperature was controlled by PID not to exceed 250 °C, and the denitration was carried out for 30 min.

[0033] 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.

[0034] 172 g of corundum balls were added to the denitration tank, and the ball mill was turned at 300 rpm to make powder. After milling, 576.1 g of powder material was taken out, 1.5 g of material was adhered to the tank, and the ratio of oxygen to uranium was 3.02:1...

Embodiment 2

[0036] The volume of uranyl nitrate solution was 5.6 L, containing 147 g of uranium, and the concentration of nitric acid was 0.6 mol / L.

[0037] The above-mentioned uranyl nitrate solution was continuously transported into the 1.8 L denitration tank in the microwave resonant cavity by a metering pump, and the microwave power was set to 700 W for heating.

[0038] The denitration temperature was controlled by PID not to exceed 250 °C, and the denitration was carried out for 23 min.

[0039] The denitrified material was taken out and put into 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.

[0040] 117 g of corundum balls were added to the denitration tank, and the ball mill was turned at 300 rpm to make powder. After milling, 243.3 g of powder material was taken out, 0.78 g was adhered to the material tank, and the ratio of powder to uranium was 3.1:1.

[004...

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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, in particular 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 in the production of uranium dioxide and uranium tetrafluoride, and the industrial method is the precipitation method (wet method) or the direct denitration method of uranyl nitrate (dry method). The wet method has serious disadvantages such as large consumption of reagents, requiring a large amount of equipment and pipelines, many processes, cumbersome operation, difficulty in realizing automation and remote control, and large amount of waste liquid. The fluidized bed method commonly used in the dry method is prone to phenomena such as "bed vibration", material block, "wet bed", nozzle blockage and scarring at...

Claims

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Application Information

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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
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