CN112044365B - Fluidized bed device for preparing uranium nitride and application method thereof - Google Patents

Fluidized bed device for preparing uranium nitride and application method thereof Download PDF

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CN112044365B
CN112044365B CN202010980911.0A CN202010980911A CN112044365B CN 112044365 B CN112044365 B CN 112044365B CN 202010980911 A CN202010980911 A CN 202010980911A CN 112044365 B CN112044365 B CN 112044365B
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fluidized bed
temperature
gas
container body
tail gas
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CN112044365A (en
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孙永菊
梅华平
李桃生
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Hefei Institutes of Physical Science of CAS
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    • B01J8/18—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles
    • B01J8/24—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles according to "fluidised-bed" technique
    • B01J8/26—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles according to "fluidised-bed" technique with two or more fluidised beds, e.g. reactor and regeneration installations
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    • B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
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    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/30—Controlling by gas-analysis apparatus
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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    • B01D53/34—Chemical or biological purification of waste gases
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    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F33/00—Other mixers; Mixing plants; Combinations of mixers
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    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F33/00—Other mixers; Mixing plants; Combinations of mixers
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    • B01F33/836—Mixing plants; Combinations of mixers combining mixing with other treatments
    • B01F33/8361—Mixing plants; Combinations of mixers combining mixing with other treatments with disintegrating
    • B01F33/83613—Mixing plants; Combinations of mixers combining mixing with other treatments with disintegrating by grinding or milling
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    • B01J8/1836—Heating and cooling the reactor
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B01J8/1872—Details of the fluidised bed reactor
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B21/00—Nitrogen; Compounds thereof
    • C01B21/06—Binary compounds of nitrogen with metals, with silicon, or with boron, or with carbon, i.e. nitrides; Compounds of nitrogen with more than one metal, silicon or boron
    • C01B21/0615—Binary compounds of nitrogen with metals, with silicon, or with boron, or with carbon, i.e. nitrides; Compounds of nitrogen with more than one metal, silicon or boron with transition metals other than titanium, zirconium or hafnium
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    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
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Abstract

The invention provides a fluidized bed device for preparing uranium nitride, which comprises a gas system, a mixing system, a low-temperature fluidized bed, a high-temperature fluidized bed, a tail gas treatment device and an absorption tower, wherein the gas system is connected with the low-temperature fluidized bed; the gas system is connected with the low-temperature fluidized bed and the high-temperature fluidized bed respectively, the mixing system is connected with the low-temperature fluidized bed, the low-temperature fluidized bed is connected with the high-temperature fluidized bed, the low-temperature fluidized bed and the high-temperature fluidized bed are connected with the tail gas disposal device respectively, and the tail gas disposal device is connected with the absorption tower. The invention also provides a using method of the fluidized bed device for preparing uranium nitride. The reaction steps are respectively controlled to be carried out in the low-temperature fluidized bed and the high-temperature fluidized bed, so that the smooth reaction under different temperature requirements is ensured; the tail gas is purified in the tail gas treatment device, so that the discharged gas is ensured to have no pollution to the environment. The method can ensure high reaction yield of uranium nitride preparation and thorough tail gas treatment.

Description

Fluidized bed device for preparing uranium nitride and application method thereof
Technical Field
The invention relates to the technical field of nuclear engineering, in particular to a fluidized bed device for preparing uranium nitride and a using method thereof.
Background
Nuclear energy is a clean, efficient and safe energy source and currently occupies an important position in the world energy structure. In recent years, various advanced reactors have been widely studied with the development of the nuclear industry. The reactor is gradually miniaturized, the refueling period is long, the metal is cooled, and the like, so that new requirements are continuously provided for nuclear fuel serving as a reactor core material: high melting point, high thermal conductivity, high heavy metal atom density, high compatibility with cladding materials and coolants, low expansion, low fission gas release and manufacturability, i.e., good fuel propagation properties, high thermal conductivity, high thermal stability, good chemical compatibility with cladding materials, industrial-grade post-processing capability, and the like.
Uranium nitride has most of the excellent properties and potentially the best performance characteristics of conventional ceramic fuels. The uranium nitride fuel has excellent performances of high uranium density, high thermal conductivity, high temperature stability, good compatibility with liquid metal and the like, so that the uranium nitride fuel becomes a preferred fuel for future space reactor power, space nuclear power sources and nuclear power rockets. Uranium nitride fuels were designed in SPR-6, SP-100, SAFE, HOMER, Prometheus, SAFE-400, HOMER-15, JIMO, SSTAR, HPM, and Russian SVBR-75/100 mini-reactors in the United states, and are also important candidates for fourth generation nuclear energy systems. In the fourth generation nuclear energy system planning, the uranium nitride fuel has been internationally used as an important candidate fuel for two types of reactors, namely, lead-cooled block reactors (LFR) and sodium-cooled fast reactors (SFR). Compared with carbide fuel, the nitride fuel is relatively less active and can be preserved under the protection of inert gas with industrial purity; the nitride synthesis is relatively simple; nitride swells less because it can hold more fission gases.
Based on the advantages of uranium nitride fuel, research units are continuously researched from the last 60 th century around the world, and the current synthetic methods of uranium nitride fuel mainly comprise a carbothermic synthesis method, a metal nitriding method, a uranium fluoroamine compound decomposition method, an electric arc melting method, a sol-gel method and the like. The research mainly focuses on method research, and few special equipment researches for uranium nitride preparation are conducted, and the special equipment researches are all intermittent production equipment.
Based on the above, there is an urgent need for a safe fluidized bed apparatus for preparing uranium nitride, which can improve reaction efficiency, and a method for using the same.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a fluidized bed device for preparing uranium nitride and a using method thereof.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a fluidized bed device for preparing uranium nitride comprises a gas system, a mixing system, a low-temperature fluidized bed, a high-temperature fluidized bed, a tail gas treatment device and an absorption tower; the gas system is connected with the low-temperature fluidized bed and the high-temperature fluidized bed respectively, the mixing system is connected with the low-temperature fluidized bed, the low-temperature fluidized bed is connected with the high-temperature fluidized bed, the low-temperature fluidized bed and the high-temperature fluidized bed are connected with the tail gas disposal device respectively, and the tail gas disposal device is connected with the absorption tower.
Further, the gas system comprises Ar, Ar and NH3、N2、H2The gas system is used for introducing Ar into the low-temperature fluidized bed and introducing Ar and NH into the high-temperature fluidized bed3、N2、H2The gases are combined.
Furthermore, the mixing system is a container with a ball milling function, and the interior of the mixing system comprises UO with a molar ratio of 1: 4-1: 82And NH4HF2Raw materials or U with the mol ratio of 1: 12-1: 243O8And NH4HF2Raw materials.
Further, the low-temperature fluidized bed comprises a first container body, a first lower flange, a first lower net rail, a first heating device, a first temperature control sensor, a first feeding hole, a first discharging hole, a first upper net rail and a first upper flange, the upper end and the lower end of the first container body are respectively connected with a first upper flange and a first lower flange, the first upper flange and the first lower flange are respectively provided with a first air outlet and a first air inlet, an air cavity is arranged in the first lower flange, the first container body is a polytetrafluoroethylene lining, a first heating device and a first temperature control sensor are arranged on the first container body and used for controlling substances in the first container body to be heated to a set temperature, first upper net fence and first lower net fence are equipped with respectively at the upper and lower both ends in the first container body, have seted up first feed inlet and first discharge gate on the first container body between first upper net fence and the first lower net fence.
Further, the high-temperature fluidized bed comprises a second container body, a second lower flange, a second lower net fence, a second heating device, a second temperature control sensor, a second feeding hole, a second discharging hole, a second upper net fence and a second upper flange, the upper end and the lower end of the second container body are respectively connected with a second upper flange and a second lower flange, a second air outlet and a second air inlet are respectively arranged on the second upper flange and the second lower flange, an air cavity is arranged in the second lower flange, the second container body is made of molybdenum alloy, a second heating device and a second temperature control sensor are arranged on the second container body and used for controlling substances in the second container body to be heated to a set temperature, and a second feeding hole and a second discharging hole are formed in the second container body between the second upper net fence and the second lower net fence.
Furthermore, the tail gas treatment device is of an integrated container structure and sequentially comprises a tail gas inlet, a dust removal plate block, a hydrogen fluoride absorption plate block, an ammonia absorption plate block and a tail gas outlet in the gas flowing direction.
Furthermore, the dust removing plate is a cooling deceleration net, and the hydrogen fluoride absorbing plate is Ca (OH)2And NaOH, and the ammonia gas trapping plate is dilute hydrochloric acid.
Further, still include gaseous detection module, gaseous detection module installs and is used for detecting the tail gas absorption condition on the tail gas outlet.
Further, the absorption tower is a weak base solution.
In order to achieve the above object, the present invention also provides a method for using a fluidized bed apparatus for preparing uranium nitride, comprising the following steps:
S1、UO2and NH4HF2In a molar ratio of 1:4 to 1:8 or U3O8And NH4HF2Loading the mixture into a mixing device according to the molar ratio of 1: 12-1: 24, and mixing and grinding the mixture in the mixing device for 30-60 minutes to obtain ground powder particles;
s2, introducing argon into the low-temperature fluidized bed, and repeatedly cleaning for 3 times;
s3, transferring the mixed and ground powder particles to a low-temperature fluidized bed, heating the powder particles to 20-125 ℃ through a first heating device and a first temperature control sensor, and reacting for 3-12 hours to obtain a reaction product;
s4, transferring the reaction product into a high-temperature fluidized bed, and introducing Ar and NH3、N2、H2The gas mixture is combined, heated to 700-1000 ℃ by a second heating device and a second temperature control sensor, reacted for 5-20 hours, and cooled to room temperature to obtain a uranium nitride product;
and S5, treating all tail gas generated in the steps in a tail gas treatment device, and finally, completely absorbing the tail gas by an absorption tower.
Has the beneficial effects that: the reaction steps are respectively controlled to be carried out in the low-temperature fluidized bed and the high-temperature fluidized bed, so that the smooth reaction under different temperature requirements is ensured; the tail gas is purified in the tail gas treatment device, so that the discharged gas is ensured to have no pollution to the environment. The method can ensure high reaction yield of uranium nitride preparation and thorough tail gas treatment.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic structural diagram of a fluidized bed apparatus for preparing uranium nitride according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a low-temperature fluidized bed according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a high-temperature fluidized bed according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an exhaust gas treatment device according to an embodiment of the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
Example 1
A fluidized bed device for preparing uranium nitride comprises a gas system 1, a mixing system 2, a low-temperature fluidized bed 3, a high-temperature fluidized bed 4, a tail gas treatment device 5 and an absorption tower 6; the gas system 1 is connected with the low-temperature fluidized bed 3 and the high-temperature fluidized bed 4 respectively, the mixing system 2 is connected with the low-temperature fluidized bed 3, the low-temperature fluidized bed 3 is connected with the high-temperature fluidized bed 4, the low-temperature fluidized bed 3 and the high-temperature fluidized bed 4 are connected with the tail gas disposal device 5 respectively, and the tail gas disposal device 5 is connected with the absorption tower 6.
In the embodiment, the reaction steps are respectively controlled to be carried out in the low-temperature fluidized bed and the high-temperature fluidized bed, so that the smooth reaction under different temperature requirements is ensured; guarantee reaction condition, process systematization more through compounding system and gas system, carry out purification treatment with tail gas in addition through tail gas processing apparatus, guarantee exhaust gas's security through the absorption tower at last.
Specifically, the gas system 1 comprises Ar, Ar and NH3、N2、H2The gas system 1 is used for introducing Ar into the low-temperature fluidized bed and introducing Ar and NH into the high-temperature fluidized bed 43、N2、H2The gases are combined.
The combined gas of this example avoids the safety problems caused by pure ammonia.
Specifically, the mixing system 2 is a container with a ball milling function, and the interior of the mixing system comprises UO with a molar ratio of 1: 4-1: 82And NH4HF2Raw materials or U with the mol ratio of 1: 12-1: 243O8And NH4HF2Raw materials.
The mixing system of this embodiment has the ball-milling function, can adjust the compounding time as required in order to adjust the granule particle diameter, satisfies the performance demand of sintering to this mixes the grinding to the material.
In a specific example, the low temperature fluidized bed 3 includes a first container body 30, a first lower flange 31, a first lower net rail 32, a first heating device 33, a first temperature control sensor 34, a first feed inlet 35, a first discharge outlet 36, a first upper net rail 37, and a first upper flange 38, the first upper flange 38 and the first lower flange 31 are respectively connected to the upper end and the lower end of the first container body 30, the first upper flange 38 and the first lower flange 31 are respectively provided with a first gas outlet 380 and a first gas inlet 310, a gas cavity 311 is arranged in the first lower flange 31, the first container body 30 is a polytetrafluoroethylene lining 39, the first container body 30 is provided with the first heating device 33 and the first temperature control sensor 34 for controlling the substances in the first container body 30 to be heated to a set temperature, the first upper net rail 37 and the first lower net rail 32 are respectively arranged at the upper end and the lower end of the first container body 30, the first container body 30 between the first upper net rail 37 and the first lower net rail 32 is opened with a first inlet 35 and a first outlet 36.
It should be noted that the low-temperature fluidized bed of the present embodiment is communicated with the material mixing system through the first feed port, is communicated with the high-temperature fluidized bed through the first discharge port, is communicated with the gas system through the first gas inlet, and is communicated with the tail gas treatment device through the first gas outlet; introducing gas into the low-temperature fluidized bed through a gas system for cleaning, introducing the adaptation materials ground and mixed in the mixing system into the low-temperature fluidized bed, enabling the adaptation materials to reach a reaction temperature of 120 ℃ through a first temperature control sensor and a first heating device, and obtaining a reaction product after the time reaches 3 hours; further introducing the reaction product into a high temperature fluidized bed; the tail gas that the in-process produced is derived to the tail gas processing apparatus in through first gas outlet.
In a specific example, the high temperature fluidized bed 4 includes a second container body 40, a second lower flange 41, a second lower net rail 42, a second heating device 43, a second temperature control sensor 44, a second feed inlet 45, a second discharge outlet 46, a second upper net rail 47, and a second upper flange 48, the second upper flange 48 and the second lower flange 41 are respectively connected to the upper end and the lower end of the second container body 40, the second upper flange 48 and the second lower flange 41 are respectively provided with a second gas outlet 480 and a second gas inlet 410, a gas cavity 411 is provided in the second lower flange 41, the second container body 40 is made of molybdenum alloy, the second container body 40 is provided with the second heating device 43 and the second temperature control sensor 44 for controlling the substances in the second container body 40 to be heated to a set temperature, the second upper net rail 47 and the second lower net rail 42 are respectively provided at the upper end and the lower end of the second container body 40, a second feeding hole 45 and a second discharging hole 46 are opened on the second container body 40 between the second upper net rail 47 and the second lower net rail 42.
It should be noted that the second feed inlet of the high-temperature fluidized bed of the present embodiment is communicated with the first discharge outlet of the low-temperature fluidized bed, is communicated with the gas system through the second gas inlet, and is communicated with the tail gas treatment device through the second gas outlet; introducing gas into the high-temperature fluidized bed through a gas system for cleaning, introducing a reaction product of the low-temperature fluidized bed into the high-temperature fluidized bed through a second feed inlet, enabling the reaction product to reach a reaction temperature of 1000 ℃ through a second temperature control sensor and a second heating device, allowing the reaction product to reach the reaction temperature for 15 hours, and cooling the reaction product to room temperature to obtain a final reaction product; leading out a final reaction product through a second discharge hole; the tail gas that the in-process produced is derived to the tail gas processing apparatus in through first gas outlet.
In a specific example, the tail gas treatment device 5 is an integrated container structure, and sequentially comprises a tail gas inlet 50, a dedusting plate 51, a hydrogen fluoride absorption plate 52, an ammonia absorption plate 53 and a tail gas outlet 54 in a gas flowing direction, wherein the dedusting plate 51 is a cooling deceleration net, and the hydrogen fluoride absorption plate 52 is ca (oh)2And the ammonia gas trapping plate 53 is dilute hydrochloric acid, and the ammonia gas trapping plate further comprises a gas detection module 55, wherein the gas detection module 55 is installed on the tail gas outlet 54 and used for detecting the tail gas absorption condition.
According to the embodiment, the high efficiency of the tail gas treatment device is ensured by selecting treatment materials according to the tail gas treatment sequence and the pertinence of each plate.
Specifically, the absorption tower 6 is a weak base solution.
It should be noted that the weak alkaline solution may be lime water solution, and the safety of the exhaust gas is ensured in the last step.
Example 2
In order to achieve the above object, this embodiment also provides a method for using a fluidized bed apparatus for preparing uranium nitride, including the following steps:
S1、UO2and NH4HF2In a molar ratio of 1:4 to 1:8 or U3O8And NH4HF2Loading the mixture into a mixing device according to the molar ratio of 1: 12-1: 24, and mixing and grinding the mixture in the mixing device for 30-60 minutes to obtain ground powder particles;
s2, introducing argon into the low-temperature fluidized bed, and repeatedly cleaning for 3 times;
s3, transferring the mixed and ground powder particles to a low-temperature fluidized bed, heating the powder particles to 20-125 ℃ through a first heating device and a first temperature control sensor, and reacting for 3-12 hours to obtain a reaction product;
s4, transferring the reaction product into a high-temperature fluidized bed, and introducing Ar and NH3、N2、H2The gas mixture is combined, heated to 700-1000 ℃ by a second heating device and a second temperature control sensor, reacted for 5-20 hours, and cooled to room temperature to obtain a uranium nitride product;
and S5, treating all tail gas generated in the steps in a tail gas treatment device, and finally, completely absorbing the tail gas by an absorption tower.
The fluidized bed device for preparing uranium nitride has the same advantages as the fluidized bed device for preparing uranium nitride in the prior art, and is not described again here.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (7)

1. The fluidized bed device for preparing uranium nitride is characterized by comprising a gas system (1), a mixing system (2), a low-temperature fluidized bed (3), a high-temperature fluidized bed (4), a tail gas treatment device (5) and an absorption tower (6); the gas system (1) is respectively connected with the low-temperature fluidized bed (3) and the high-temperature fluidized bed (4), the mixing system (2) is connected with the low-temperature fluidized bed (3), the low-temperature fluidized bed (3) is connected with the high-temperature fluidized bed (4), the low-temperature fluidized bed (3) and the high-temperature fluidized bed (4) are respectively connected with the tail gas treatment device (5), and the tail gas treatment device (5) is connected with the absorption tower (6);
wherein the gas system (1) comprises Ar, Ar and NH3、 N2、H2A gas system (1) for introducing Ar into the low-temperature fluidized bed， Ar and NH are introduced into the high-temperature fluidized bed (4)3、 N2、H2A combination gas; the reaction temperature of the low-temperature fluidized bed (3) is 20-125 ℃, and the reaction temperature of the high-temperature fluidized bed (4) is 700-1000 ℃;
the tail gas treatment device (5) is of an integrated container structure and sequentially comprises a tail gas inlet (50), a dedusting plate block (51), a hydrogen fluoride absorption plate block (52), an ammonia absorption plate block (53) and a tail gas outlet (54) in the gas flowing direction;
the mixing system (2) is a container with a ball milling function, and the mixing system comprises a mixing tank body and a mixing tank body, wherein the mixing tank body is internally provided with a molar ratio of 1: 4-1: UO of 8 ratio2And NH4HF2Raw materials or a molar ratio of 1: 12-1: u of 24 ratio3O8And NH4HF2Raw materials.
2. The fluidized bed device for preparing uranium nitride according to claim 1, wherein the low-temperature fluidized bed (3) comprises a first container body (30), a first lower flange (31), a first lower net rail (32), a first heating device (33), a first temperature control sensor (34), a first feed inlet (35), a first discharge outlet (36), a first upper net rail (37) and a first upper flange (38), the upper end and the lower end of the first container body (30) are respectively connected with the first upper flange (38) and the first lower flange (31), the first upper flange (38) and the first lower flange (31) are respectively provided with a first gas outlet (380) and a first gas inlet (310), the first lower flange (31) is internally provided with a gas cavity, the first container body (30) is a polytetrafluoroethylene lining (39), and the first container body (30) is provided with the first heating device (33) and the first temperature control sensor (34) for controlling the first gas inlet (310) The material in the container body (30) is heated to a set temperature, a first upper net rail (37) and a first lower net rail (32) are respectively arranged at the upper end and the lower end in the first container body (30), and a first feeding hole (35) and a first discharging hole (36) are formed in the first container body (30) between the first upper net rail (37) and the first lower net rail (32).
3. The fluidized bed apparatus for preparing uranium nitride according to claim 1, wherein the high temperature fluidized bed (4) comprises a second container body (40), a second lower flange (41), a second lower grid (42), a second heating device (43), a second temperature control sensor (44), a second feed inlet (45), a second discharge port (46), a second upper grid (47) and a second upper flange (48), the upper and lower ends of the second container body (40) are respectively connected with the second upper flange (48) and the second lower flange (41), the second upper flange (48) and the second lower flange (41) are respectively provided with a second gas outlet (480) and a second gas inlet (410), a gas cavity is arranged in the second lower flange (41), the second container body (40) is made of molybdenum alloy, and the second container body (40) is provided with the second heating device (43) and the second temperature control sensor (44) for controlling the second container body (40) The materials in the second container body (40) are heated to a set temperature, a second upper net fence (47) and a second lower net fence (42) are respectively arranged at the upper end and the lower end in the second container body (40), and a second feeding hole (45) and a second discharging hole (46) are formed in the second container body (40) between the second upper net fence (47) and the second lower net fence (42).
4. A fluid bed apparatus for the production of uranium nitride according to claim 1, wherein the dedusting plate (51) is a cooling and decelerating net and the hydrogen fluoride absorption plate (52) is ca (oh)2And NaOH, and the ammonia gas trapping plate (53) is dilute hydrochloric acid.
5. The fluidized bed apparatus for preparing uranium nitride according to claim 1, wherein the tail gas processing apparatus (5) further comprises a gas detection module (55), and the gas detection module (55) is installed on the tail gas outlet (54) for detecting a tail gas absorption condition.
6. A fluidized bed apparatus for producing uranium nitride according to claim 1, wherein the absorption tower (6) is a weak base solution.
7. Use of a fluid bed apparatus for uranium nitride production according to any one of claims 1 to 6, comprising the steps of:
S1、UO2and NH4HF2In a molar ratio of 1:4 to 1:8 or U3O8And NH4HF2Filling the mixture into a mixing device according to the molar ratio of 1: 12-1: 24, and mixing and grinding the mixture in the mixing device for 30-60 minutes to obtain ground powder particles;
s2, introducing argon into the low-temperature fluidized bed, and repeatedly cleaning for 3 times;
s3, transferring the mixed and ground powder particles to a low-temperature fluidized bed, heating the powder particles to 20-125 ℃ through a first heating device and a first temperature control sensor, and reacting for 3-12 hours to obtain a reaction product;
s4, transferring the reaction product into a high-temperature fluidized bed, and introducing Ar and NH3、N2、H2The gas mixture is combined, heated to 700-1000 ℃ by a second heating device and a second temperature control sensor, reacted for 5-20 hours, and cooled to room temperature to obtain a uranium nitride product;
and S5, treating all tail gas generated in the steps in a tail gas treatment device, and finally, completely absorbing the tail gas by an absorption tower.
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