JP4319000B2 - Ammonium uranate particle production equipment - Google Patents

Description

  The present invention relates to an apparatus for producing ammonium heavy uranate particles, and more specifically, the flow of ammonium heavy uranate particles produced when producing ammonium heavy uranate particles as a raw material for fuel nuclei from uranyl nitrate and aqueous ammonia. More specifically, in the production of ammonium heavy uranate particles capable of improving the properties, more specifically, ammonium heavy uranate and other components produced by the reaction of uranyl nitrate and aqueous ammonia adhere to the inner surface of the dropping tank. The present invention relates to an apparatus for producing ammonium heavy uranate particles, which can prevent frictional resistance with ammonium heavy uranate particles from increasing and decrease the fluidity of ammonium heavy uranate particles.

  A fuel for a HTGR is generally manufactured through the following processes. First, uranium oxide powder is dissolved in nitric acid to obtain a uranyl nitrate stock solution. Next, pure water, a thickener and the like are added to the uranyl nitrate stock solution and stirred to obtain a dropping stock solution. The prepared dropping undiluted solution is cooled to a predetermined temperature, adjusted in viscosity, and then dropped into an aqueous ammonia solution using a small-diameter dropping nozzle.

  The droplets dropped on the aqueous ammonia solution are sprayed with ammonia gas before reaching the surface of the aqueous ammonia solution. The surface of the droplet is gelled by the ammonia gas, thereby preventing the gelled droplet from being deformed when the falling droplet collides with the surface of the aqueous ammonia solution. In addition, the gelled droplet may be hereinafter referred to as “gelled droplet”. The gelled droplets in the aqueous ammonia solution become ammonium heavy uranate particles (hereinafter sometimes abbreviated as “ADU particles”) by the reaction of uranyl nitrate existing in the ammonia with ammonia.

  The ADU particles are dried and then roasted in the air to become uranium trioxide particles. Furthermore, the uranium trioxide particles are reduced and sintered to become high-density uranium dioxide particles. The uranium dioxide particles are screened, that is, classified to obtain fuel core fine particles having a predetermined particle size.

  The fuel core particles are loaded onto the fluidized bed, and the gas for forming the coating layer is pyrolyzed to form a coating layer composed of a plurality of layers on the surface of the fuel core particles. The first layer in the coating layer is formed of low density pyrolytic carbon produced by pyrolyzing acetylene at about 1400 ° C. In addition, the second layer and the fourth layer in the coating layer are formed of high-density pyrolytic carbon generated by pyrolyzing propylene at about 1400 ° C. Further, the third layer in the coating layer is formed by thermally decomposing methyltrichlorosilane at about 1600 ° C.

  After the coating layer is formed, the HTGR fuel is molded as a general fuel compact. This fuel compact is obtained by press-molding or molding a high-temperature gas reactor fuel into a hollow cylindrical shape together with a graphite matrix material made of graphite powder, a binder, etc. (see Non-Patent Document 1). .

  By the way, when the uranyl nitrate stock solution is dropped from a vibrating dropping nozzle into unstirred ammonia water to produce ammonium heavy uranate particles, the ammonium heavy uranate particles formed in the ammonia water are deposited at the bottom of the dropping tank. . Then, the ammonium heavy uranate particles present in the lower part of the deposit of the deposited ammonium heavy uranate particles are deformed by the weight of the ammonium heavy uranate particles deposited on the upper part to form a true sphere of the desired shape. There is a problem that ammonium biuranate particles cannot be produced. In order to solve this problem, according to the study by the present inventors, if the uranyl nitrate stock solution is dropped into the ammonia water while stirring the ammonia water, the gelled droplets become a fluid state in the ammonia water. It has been found that there is a possibility of producing ammonium biuranate particles having a shape close to. However, ammonium heavy uranate and by-products generated by the reaction between uranyl sulfate and aqueous ammonia may adhere to the inner surface of the dropping tank, and the friction between the inner wall surface of the dropping tank and ammonium heavy uranate particles may occur. As a result, there arises a new problem that the fluidity of the ammonium heavy uranate particles that should flow in the dropping tank decreases.

Hasegawa Masayoshi, Mishima Yoshimi supervision "Reactor Materials Handbook" first edition 221-247, Nikkan Kogyo Shimbun

  The present invention is based on the fact that the main component of the solid matter that adheres to the inner wall of the dropping tank in the apparatus for producing ammonium heavy uranate particles and hinders the fluidity of ammonium heavy uranate particles is ammonium nitrate. .

  The present invention is a relatively simple apparatus for treating solid matter produced and attached to the inner surface of a dropping tank that inhibits the fluidity of ammonium heavy uranate particles as described above, such as ammonium nitrate, which is a reaction product of uranyl nitrate and ammonia. It is intended to be removed easily by operation. That is, the problem to be solved by the present invention is that the adhering matter adhering to the inner wall or the like of the dropping tank can be easily removed so that the gelled particles can be in a good fluid state in the ammonia water. It is to provide an apparatus for producing ammonium uranate particles. Another problem to be solved by the present invention is that heavy uranium that can improve the fluidity of gelled particles existing in ammonia water stored in a dropping tank and produce substantially spherical ammonium heavy uranate particles. It is to provide an ammonium acid particle production apparatus.

As means for solving the problems,
[Claim 1] An apparatus for producing ammonium heavy uranate particles used in a process of producing a fuel nucleus containing uranium dioxide, which is connected to a dropping tank capable of containing ammonia water and a bottom surface of the dropping tank A discharge pipe having an opening for injecting ammonia gas or an aqueous ammonia solution into the dropping tank, an ammonia gas introducing pipe communicating with the discharge pipe and introducing ammonia gas into the dropping tank, and the dropping tank An apparatus for producing ammonium heavy uranate particles, characterized by having a cleaning means for cleaning the inside with dilute nitric acid,
According to a second aspect of the present invention, the cleaning means takes out the dilute nitric acid stored in the dropping tank from the vicinity of the liquid level of the dilute nitric acid stored in the dropping tank to the outside of the dropping tank. 2. The ammonium heavy uranate particles according to claim 1, comprising a circulation channel introduced into a lower portion of the dropping tank and a transfer means for forcibly transferring dilute nitric acid in the circulation channel. Manufacturing equipment,
According to a third aspect of the present invention, the cleaning means includes an injection nozzle having an injection hole for injecting dilute nitric acid toward the wall surface of the dropping tank, and a dilute nitric acid supply means for supplying dilute nitric acid to the injection nozzle. The apparatus for producing ammonium biuranate according to claim 1, characterized in that:
A fourth aspect of the present invention is the apparatus for producing ammonium heavy uranate particles according to the third aspect, wherein the spray nozzle is an annular body disposed along the inner wall surface of the dropping tank.
5. The ammonium deuterated uranium according to claim 3, wherein the injection nozzle is disposed on a longitudinal axis of the dripping tank and is formed so as to be capable of injecting dilute nitric acid in the radial direction while rotating. Particle production equipment,
Claim 6 is the production of ammonium heavy uranate particles according to any one of claims 3 to 5, wherein the spray nozzle is coupled to a vertical movement drive device that moves the spray nozzle up and down in the dropping tank. Device,
Claim 7 is the ammonium heavy uranate particle production apparatus according to claim 1, wherein the cleaning means includes a forced rubbing means for rubbing at least an inner wall of the dropping tank.
An eighth aspect of the invention is the apparatus for producing ammonium heavy uranate particles according to the first aspect, wherein the cleaning means includes an ultrasonic irradiation device that irradiates the diluted nitric acid stored in the dropping tank with ultrasonic waves .

According to the present invention, an apparatus for producing ammonium heavy uranate particles having the following effects can be provided.
(1) Since the inner wall of the dropping tank is washed with dilute nitric acid in the cleaning device, there are no deposits on the inner wall of the dropping tank when the gelled particles in the aqueous ammonium solution in the dropping tank are in a fluid state. Even if the gelled particles in a fluidized state collide with the inner wall of the dropping tank or the like, the gelled particles are not damaged. Therefore, substantially spherical ammonium biuranate particles can be easily produced.
(2) Since the dilute nitric acid is circulated inside and outside the dripping tank by the circulation channel, for example, a flow state of dilute nitric acid flowing from the bottom to the top is realized in the dripping tank, and the flow of the dilute nitric acid causes As a result, the true spherical ammonium biuranate particles can be easily produced.
(3) Since dilute nitric acid is sprayed from the spray nozzle toward the wall surface of the dropping tank, deposits such as the inner wall of the dropping tank can be easily removed.
(4) When the spray nozzle is an annular body arranged along the inner wall of the dropping tank, the deposits attached to the inner wall surface of the dropping tank can be efficiently removed.
(5) The injection nozzle is arranged on the vertical axis of the dropping tank, and is configured to be capable of injecting dilute nitric acid in the radial direction while rotating, so the force of dilute nitric acid to which injection force and rotational force are added The inner wall surface of the dropping tank can be efficiently washed with dilute nitric acid.
(6) Since dilute nitric acid is sprayed from the spray nozzle while moving the spray nozzle up and down in the dropping tank, the inner wall surface and the like of the dropping tank can be efficiently washed with diluted nitric acid.
(7) Since the inner wall surface of the dropping tank is rubbed with the forced rubbing means, the deposits on the inner wall surface of the dropping tank can be forcibly removed.
(8) Since dilute nitric acid stored in the dropping tank is finely moved by irradiating with ultrasonic waves, not only large deposits attached to the inner wall of the dropping tank, but also fine deposits are efficiently used. Can be removed.
(9) The gel is produced by washing the inside of the dropping tank with the cleaning means according to claims 1 to 8, filling the clean dropping tank with ammonia water, and supplying ammonia gas or ammonia water from the lower part of the dropping tank. The flow state of the gelled particles can be revealed, and even if the flowing gelled particles collide with the inner wall of the dropping tank, the gelled particles are not deformed and the flow state of the gelled particles is inhibited. As a result, it is possible to efficiently produce ammonium uranate particles that are almost spherical as a result .

  As shown in FIG. 1, an ammonium heavy uranate particle manufacturing apparatus 1 which is an example of the present invention includes a dropping tank 2 and a cleaning means 3. The dripping tank 2 is a substantially cylindrical tank. A predetermined amount of dilute nitric acid is stored in the dropping tank 2. A pipe 4 that opens at a position lower than the liquid level of the stored predetermined amount of diluted nitric acid is connected to the side surface of the dropping tank 2. The other end of the pipe 4 is coupled to the middle of the discharge pipe 5 coupled to the bottom surface of the dropping tank 2 so as to open to the bottom surface of the dropping tank 2. In the middle of the pipe 4, transfer means for forcibly circulating the liquid existing in the pipe 4, for example, a pump 6 is interposed. A filter 4 a is attached to an opening portion that opens to the side surface of the dropping tank 2 in the pipe 4. This filter 4 a prevents solids that may be present in the dilute nitric acid in the dropping tank 2 from entering the pipe 4. Similarly, a second filter 5 a is attached to the opening where the discharge pipe 5 opens at the bottom of the dropping tank 2, so that the solid content in the dropping tank 2 does not fall into the discharge pipe 5. ing. In the ammonium heavy uranate particle production apparatus 1 shown in FIG. 1, a circulation flow path is formed by the pipe 4 and the discharge pipe 5.

  A pair of ammonia gas outlet pipes 7 and 7 are coupled to the upper side surface of the dropping tank 2 so that ammonia gas is introduced into the upper space of the dropping tank 2. An ammonia gas supply means (not shown) for supplying ammonia gas is connected to the ammonia gas outlet pipes 7 and 7. The ammonia gas outlet pipes 7 and 7 function when producing ammonium heavy uranate particles.

  A lid 9 having an opening 8 formed so that the dropped droplets pass through is attached to the upper opening of the dropping tank 2. A dropping nozzle (not shown) for dropping the dropping stock solution is disposed above the opening 8. The dropping nozzle includes a dropping stock solution storage tank (not shown) for storing the dropping stock solution, a pipe (not shown) for transporting the dropping stock solution from the dropping stock solution storage tank to the dropping nozzle, and a dropping stock solution in the dropping stock solution storage tank. A dripping stock solution supply means (not shown) including a pump (not shown) or the like for forcibly transferring the liquid to the dropping nozzle is disposed.

  Further, a switching valve 10 and an ammonia gas introduction pipe 11 are connected to the discharge pipe 5 connected to the lower part of the dropping tank 2. The ammonia gas introduction pipe 11 serves as means for introducing ammonia gas into the dropping tank 2 after switching the switching valve 10 so that the discharge pipe 5 and the ammonia gas introduction pipe 11 communicate with each other. Note that. When ammonia water is introduced into the dropping tank 2, a check valve (not shown) is provided at an appropriate location on the pipe 4 close to the discharge pipe 5 so that ammonia gas does not flow back into the pipe 4. .

  The operation of the ammonium heavy uranate particle production apparatus shown in FIG. 1 will be described.

  When ammonium heavy uranate particles are produced using this ammonium heavy uranate particle production apparatus 1, as described above, substances produced mainly by the reaction of uranyl nitrate and ammonia on the inner wall surface of the dropping tank 2, etc. Solid matter made of ammonium nitrate or the like is attached. Substances adhering to the inner wall surface are removed by the cleaning means 3. That is, a predetermined amount of dilute nitric acid is charged into the dropping tank 2. The pump 6 is driven. By driving the pump 6, dilute nitric acid flows through the pipe 4. That is, dilute nitric acid is sucked into the pipe 4 from the opening portion opened to the side of the dripping tank 2, flows through the pipe 4, and passes through the discharge pipe 5 that opens to the bottom surface of the dripping tank 2. It returns to the dropping tank 2 from the opening part opened to the bottom. Thereby, dilute nitric acid circulates in the dropping tank 2 and the circulation channel.

  Since the solid matter adhering to the inner wall and the like of the dropping tank 2 is mainly ammonium nitrate, the solid matter dissolves in the dilute nitric acid and disappears after a predetermined time by circulating the dilute nitric acid.

  When the solid matter such as ammonium nitrate adhering to the inner wall of the dropping tank 2 disappears, ammonium biuranate particles are then produced as follows.

  Ammonia water is charged into the dropping tank 2. A dropping stock solution is dropped into the ammonia water from a dropping nozzle (not shown). The droplets dropped from the dropping nozzle are sprayed with ammonia gas ejected from the ammonia gas outlet pipes 7 and 7 during the dropping process from the dropping nozzle to the ammonia water. The surface of the droplet made of uranyl nitrate is partially gelled by the sprayed ammonia gas. On the other hand, in the dropping tank 2, ammonia gas is introduced into the dropping tank 2 from the ammonia gas introduction pipe 11 by the switching operation of the switching valve 10. The ammonia gas introduced into the bottom of the dripping tank 2 rises as a bubble in the ammonia water, and causes the ammonia tank to flow upward and downward in the dropping tank 2. The gelled particles dropped in the ammonia water are further reacted with uranyl nitrate and ammonia present in the dripping particles whose surfaces are gelled to form ammonium heavy uranate, and in the upward flow and the downward flow. Ride and flow. Even if the droplet that gels and flows is in contact with the inner wall of the dropping tank 2, the solid state is removed from the inner wall of the dropping tank 2 by the cleaning means 3. Without being hindered, the aqueous ammonia in the dropping tank 2 is smoothly circulated, the reaction between the uranyl nitrate and ammonia proceeds smoothly, and finally, ammonium uranate particles almost nearly spherical are formed.

  When the dropping of the predetermined amount of dropping stock solution is completed, the introduction of ammonia gas from the lower part of the dropping tank 2 is stopped. Ammonia water in the dropping tank 2 is removed, and an appropriate method, for example, by inversion of the dropping tank 2 or by scraping the contents in the dropping tank 2 or sucking the contents in the dropping tank 2 By removing, the produced ammonium biuranate particles are taken out.

  FIG. 2 is an explanatory view showing another example of the apparatus for producing ammonium heavy uranate particles of the present invention.

  The ammonium heavy uranate particle production apparatus shown in FIG. 2 is different from the ammonium heavy uranate particle production apparatus shown in FIG. 1 in the cleaning means 3A.

  This cleaning means 3A is arranged at a position higher than the liquid level of the ammonia water charged in the dropping tank 2 along the inner wall surface of the dropping tank 2, as shown in FIG. An injection nozzle 14 composed of an annular body 13 having a plurality of injection holes 12 on the peripheral surface, and dilute nitric acid supply means (not shown) for supplying dilute nitric acid into the annular body 13 are provided. Many injection holes 12 are provided so as to face the inner wall surface of the dropping tank 2 of the annular body 13.

  The dropping tank 2 is provided with a discharge pipe (not shown in FIG. 2) as shown in FIG. 1 at the bottom of the dropping tank 2, and an ammonia gas introduction pipe as shown in FIG. Not shown in FIG. 2).

  In this cleaning means 3A, after the dropping tank 2 is emptied, dilute nitric acid is injected from the injection hole 12 toward the inner wall surface. The injected diluted nitric acid collides with the inner wall surface of the dropping tank 2 and flows down along the inner wall surface of the dropping tank 2. Solid matter mainly composed of ammonium nitrate adhering to the inner wall surface of the dropping tank 2 is dissolved by the flowing down dilute nitric acid and removed from the inner wall surface.

  The cleaning nozzle 14 shown in FIG. 2 is fixed to the dropping tank 2, but can be moved up and down in the dropping tank 2 by an appropriate driving device (not shown) along the longitudinal axis of the dropping tank 2. It can also be formed. If the cleaning nozzle 14 is configured to be movable up and down, the cleaning nozzle 14 can be moved up and down while spraying dilute nitric acid from the injection hole 12, so that the inner wall of the drip tank 2 can be thoroughly cleaned and adhered to the inner wall without being left behind. The solid content can be removed.

  When the inner wall surface of the dropping tank 2 is cleaned by the cleaning means 3A, ammonium water is charged into the dropping tank 2 and ammonia gas is ejected from the lower part of the dropping tank 2 while dropping the dropping stock solution from the dropping nozzle. When the ammonium heavy uranate particles are produced by the above, the flow state of the gelled particles flowing in the ammonium water and / or the ammonium heavy uranate particles is improved, and the solid content adhering to the inner wall of the dropping tank 2 causes the heavy uranic acid to flow. Even if ammonium particles collide and the ammonium heavy uranate particles are not damaged, and even if the ammonium heavy uranate particles are not damaged, the fluidity of the ammonium heavy uranate particles in the dropping water 2 in the ammonia water is inhibited. It never happens. As a result, it is possible to efficiently produce ammonium heavy uranate particles having a shape close to a true sphere.

  FIG. 4 shows another example of an apparatus for producing ammonium heavy uranate particles.

  The ammonium heavy uranate particle manufacturing apparatus shown in FIG. 4 has the same configuration as the ammonium heavy uranate particle manufacturing apparatus shown in FIGS. 1 and 2 except for the cleaning means 3B.

  The cleaning means 3B shown in FIG. 4 includes a rotating shaft 15, a cleaning nozzle 14A attached to the tip of the rotating shaft 15, a rotating shaft driving means (not shown) for rotating the rotating shaft 15, and cleaning. A dilute nitric acid supply means (not shown) for supplying dilute nitric acid to the nozzle 14A is formed. The rotary shaft 15 is provided with a dilute nitric acid introduction path (not shown) for introducing dilute nitric acid from the dilute nitric acid supply means to the cleaning nozzle 14A. In this example, the cleaning nozzle 14A has a substantially cylindrical body, and a large number of ejection holes 12A are formed on the peripheral side surface of the cylindrical body.

  The dropping tank 2 is provided with a discharge pipe (not shown in FIG. 2) as shown in FIG. 1 at the bottom of the dropping tank 2, and an ammonia gas introduction pipe as shown in FIG. Not shown in FIG. 2).

  In this cleaning means 3B, after the dropping tank 2 is emptied, dilute nitric acid is sprayed from the spray holes 12A toward the inner wall surface of the dropping tank 2. The injected diluted nitric acid collides with the inner wall surface of the dropping tank 2 and flows down along the inner wall surface of the dropping tank 2. Solid matter mainly composed of ammonium nitrate adhering to the inner wall surface of the dropping tank 2 is dissolved by the flowing down dilute nitric acid and removed from the inner wall surface. In this case, since the injection nozzle 14A rotates and injects dilute nitric acid from the injection hole 12A, the inner wall surface of the dropping tank 2 can be efficiently cleaned.

  The cleaning nozzle 14A shown in FIG. 4 is fixed to the dropping tank 2, but can be moved up and down in the dropping tank 2 by an appropriate driving device (not shown) along the longitudinal axis of the dropping tank 2. It can also be formed. If the cleaning nozzle 14A is configured to be movable up and down, the cleaning nozzle 14A is moved up and down while spraying dilute nitric acid from the injection hole 12A, so that the inner wall of the drip tank 2 can be thoroughly cleaned and adhered to the inner wall without being left behind. The solid content to be removed can be removed.

  The production operation of ammonium heavy uranate particles shown in FIG. 4 is the same as the production operation by the ammonium heavy uranate particle production apparatus shown in FIGS. 1 and 2.

  FIG. 5 shows another example of an apparatus for producing ammonium heavy uranate particles.

  In addition to the cleaning means 3 shown in FIG. 1, the cleaning means 3A shown in FIG. 2, or the cleaning means 3B shown in FIG. 4, the apparatus for producing ammonium heavy uranate particles shown in FIG. Other than the provision, it has the same configuration as the ammonium biuranium particle production apparatus shown in FIG. 1, FIG. 2 or FIG.

  The forced rubbing means 16 can adopt various forms as long as it can remove at least the inner wall surface of the dropping tank 2 to remove the solid content adhering to the inner wall surface. The forced rubbing means 16 shown in FIG. 4 includes a rotating shaft 15A that can be rotated by a driving means (not shown), and a brush that is provided on the rotating shaft 15A and that can be rubbed on the inner wall surface of the drip tank 2. 17.

  The forcible rubbing means 16 shown in FIG. 5 forcibly rubs the inner wall surface of the dropping tank 2, so that the solid matter adhering to the inner wall surface can be forcibly scraped, and dilute nitric acid is simply injected or discharged. It is possible to remove the solid content adhering to the inner wall surface in a shorter time than by simply removing the solid content by casting.

  The forced rubbing means 16 shown in FIG. 5 is fixed to the dropping tank 2, and is moved up and down in the dropping tank 2 by an appropriate drive device (not shown) along the longitudinal axis direction of the dropping tank 2. It can also be made movable. When the forcible rubbing means 16 is configured to be movable up and down, the inner wall of the dropping tank 2 can be thoroughly cleaned, and the solid content adhering to the inner wall can be removed without being left behind.

  The production operation of ammonium heavy uranate particles shown in FIG. 5 is the same as the production operation by the ammonium heavy uranate particle production apparatus shown in FIGS. 1 and 2.

  FIG. 6 shows another example of an apparatus for producing ammonium heavy uranate particles.

  The apparatus for producing ammonium deuterated uranium particles shown in FIG. 6 uses ultrasonic irradiation as a cleaning means instead of the cleaning means 3 shown in FIG. 1, the cleaning means 3A shown in FIG. 2, or the cleaning means 3B shown in FIG. Except for the provision of the device 18, it has the same configuration as that of the ammonium biuranium particle production device shown in FIG. 1, FIG. 2 or FIG. 4.

  As shown in FIG. 6, the ultrasonic irradiation device 18 is disposed so as to be immersed in a predetermined amount of dilute nitric acid charged in the dropping tank 2 and formed so as to be able to oscillate ultrasonic waves. The ultrasonic oscillator 19 and a support bar 20 that supports the ultrasonic oscillator 19 are provided.

  When the ultrasonic oscillator 18 is provided, ultrasonic waves are oscillated in a predetermined amount of dilute nitric acid charged in the dropping tank 2, so that minute vibrations are induced in the solid matter adhering to the inner wall of the dropping tank 2. Therefore, dissolution of solid content in dilute nitric acid is promoted. Therefore, it is possible to remove even the fine solid matter adhering to the inner wall of the dropping tank 2 without leaving it. The ultrasonic irradiating device 18 is removed from the dropping tank 2 when the dropping stock solution is dropped from the dropping nozzle into the ammonium water in the dropping tank 2.

  The present invention has been described above with some examples of one embodiment of the present invention. However, the present invention is not limited to the ammonium biuranium particle production apparatus according to the above examples, and various design changes are possible. Needless to say.

  The present invention is used in the nuclear industry.

It is explanatory drawing which shows the ammonium heavy uranate particle manufacturing apparatus which is an example of this invention. It is explanatory drawing which shows the ammonium heavy uranate particle | grain manufacturing apparatus which is another example of this invention. It is explanatory drawing which shows the washing | cleaning nozzle in the ammonium heavy uranate particle manufacturing apparatus shown by FIG. It is explanatory drawing which shows the ammonium heavy uranate particle | grain manufacturing apparatus which is another example of this invention. It is explanatory drawing which shows the ammonium heavy uranate particle | grain manufacturing apparatus which is another example of this invention. It is explanatory drawing which shows the ammonium heavy uranate particle | grain manufacturing apparatus which is another example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Ammonium heavy uranate particle manufacturing apparatus 2 ... Drip tank 3, 3A, 3B ... Cleaning means 4 ... Pipe 4a ... Filter 5 ... Discharge pipe 5a ... Second filter 6 ... Pump 7 ... Ammonia gas outlet tube 8 ... Opening 9 ... Lid 10 ... Switching valve 11 ... Ammonia gas introduction tube 12, 12A ... Ejection hole 13 ... Annular bodies 14, 14A ... Cleaning nozzles 15, 15A ... Rotating shaft 16 ... Forced rubbing means 17 ... Brush 18 ... Ultrasonic irradiation device 19 ... Ultrasonic oscillator

Claims (8)

An apparatus for producing ammonium heavy uranate particles used in a process for producing a fuel nucleus containing uranium dioxide,
A dropping tank capable of containing ammonia water;
A discharge pipe coupled to the bottom surface of the dropping tank and having an opening for ejecting ammonia gas or an aqueous ammonia solution into the dropping tank;
An ammonia gas introduction pipe that communicates with the discharge pipe and introduces ammonia gas into the dropping tank;
An apparatus for producing ammonium heavy uranate particles, comprising: a cleaning means for cleaning the inside of the dropping tank with dilute nitric acid.   The cleaning means takes out the dilute nitric acid stored in the dropping tank from the vicinity of the liquid level of the diluted nitric acid stored in the dropping tank to the outside of the dropping tank, and the taken-out diluted nitric acid is placed in the lower part of the dropping tank. The apparatus for producing ammonium heavy uranate particles according to claim 1, further comprising a circulation channel to be introduced and a transfer means for forcibly transferring dilute nitric acid in the circulation channel.   The cleaning means comprises an injection nozzle having an injection hole for injecting dilute nitric acid toward the wall surface of the dropping tank, and dilute nitric acid supply means for supplying dilute nitric acid to the injection nozzle. The apparatus for producing ammonium heavy uranate particles according to claim 1.   The apparatus for producing ammonium heavy uranate particles according to claim 3, wherein the spray nozzle is an annular body arranged along the inner wall surface of the dropping tank.   The said injection nozzle is arrange | positioned on the axis line of the vertical direction in the said dripping tank, The manufacturing apparatus of the ammonium heavy uranate particle | grains of the said Claim 3 formed so that dilute nitric acid can be injected in radial direction, rotating.   The said injection nozzle is a manufacturing apparatus of the ammonium heavy uranate particle as described in any one of the said Claims 3-5 couple | bonded with the up-and-down drive device which moves this injection nozzle up and down within a dripping tank.   The said washing | cleaning means is a manufacturing apparatus of the ammonium heavy uranate particle of Claim 1 provided with the forced rubbing means which rubs at least the inner wall of a dripping tank.   The said washing | cleaning means is a manufacturing apparatus of the ammonium heavy uranate particle of Claim 1 provided with the ultrasonic irradiation apparatus which irradiates an ultrasonic wave to the dilute nitric acid stored in a dripping tank.

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