Method for preparing UO3 through uranyl nitrate pyrolysis denitration by using natural gas

A technology of uranyl nitrate and natural gas, which is applied in the field of natural uranium purification, can solve problems such as complex components, difficult maintenance and replacement, and easy damage to electric heating rods, so as to reduce the gas-solid ratio, avoid damage to electric heating elements, and provide sufficient heat supply Effect

Pending Publication Date: 2022-06-21
THE 404 COMPANY LIMITED CHINA NAT NUCLEAR
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Problems solved by technology

The internal components of the traditional denitrification fluidized bed are complex, the electric heating rod is easily damaged, and it is difficult to repair and replace

Method used

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  • Method for preparing UO3 through uranyl nitrate pyrolysis denitration by using natural gas

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Embodiment Construction

[0022] The present invention will be described in detail below with reference to specific embodiments.

[0023] After the concentrated uranyl nitrate solution is pressurized and metered by the metering pump, it is sent to the drying and denitration reactor through the feed pipe passing through the center of the hot air distributor; at the same time, the natural gas and compressed air are burned in the gas hot air furnace, The high-temperature and high-speed airflow enters the hot air distributor tangentially, and a high-speed vortex airflow is formed at the outlet of the hot air distributor. At the outlet of the hot air distributor, the material liquid is atomized by high-temperature and high-speed turbulent flow at the feeding port (nozzle). reaction, UO produced after uranyl nitrate completes the decomposition reaction 3 Part of the product particles settles in the aggregate device at the bottom of the reactor, and enters the unloading silo through the unloading device, and...

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Abstract

The invention belongs to the technical field of natural uranium purification, and particularly relates to a method for preparing UO3 through uranyl nitrate pyrolysis denitration by using natural gas. After being pressurized and metered by a metering pump, the concentrated uranyl nitrate solution is fed into a drying and denitration reactor through a feeding nozzle penetrating through the center of a hot air distributor; meanwhile, natural gas and compressed air are combusted in the hot blast stove, high-temperature and high-speed airflow is generated and tangentially enters the hot air distributor, and high-speed vortex airflow is formed at an outlet of the hot air distributor; at an outlet of the hot air distributor, material liquid is atomized by high-temperature and high-speed turbulent flow at a feeding nozzle, and atomized material fog drops realize rapid dehydration and denitration reaction in the process of rotating and downwards moving in the drying and denitration reactor. Hot air is formed through natural gas heat supply, the drying and denitration reaction is completed, the existing drying and denitration reaction conducted through electric heating energy supply is replaced, and the uranium purification production cost is effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of natural uranium purification, and in particular relates to a method for preparing UO by thermal decomposition and denitration of uranyl nitrate using natural gas 3 Methods. Background technique [0002] In order to meet the needs of my country's nuclear power development, nuclear fuel supply, while improving nuclear fuel production technology and reducing the production cost of uranium purification. In 2015, CNNC 404 Co., Ltd. built a uranium purification and conversion production line, using fluidized bed pyrolysis to denitrify high-concentration uranyl nitrate solution to generate UO 3 . Practice has proved that the UO produced by the denitrification fluidized bed 3 The specific surface area of ​​the product is small, the particle size distribution is uneven, and the bulk density is high. 3 The reaction activity is poor, the fluidization effect is poor, and the continuous and stable operation of the...

Claims

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Application Information

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IPC IPC(8): C01G43/01
CPCC01G43/01
Inventor陈登科任喜彦魏刚耿龙陈红卫高兴星彭饶屠晶王晓东包国强任先锋
OwnerTHE 404 COMPANY LIMITED CHINA NAT NUCLEAR