JP3479949B2 - Water extraction device for artificial warm bath - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to the extraction of a decay product into an acidic aqueous solution by bringing the ore powder containing radioactive substances into contact with the acidic aqueous solution to dissolve the decay product of the ore powder in the acidic aqueous solution. The present invention relates to a water extraction device for artificial warm bath.

[0002]

2. Description of the Related Art Ore decay products (thorone, radon) are contacted with an ore decaying product (thorone, radon) by contacting with an acidic aqueous solution of an organic carboxylic acid, etc. There are several known water extractors for artificial warm baths that extract the decay product into an acidic aqueous solution by dissolving it in an acidic aqueous solution. For example, as shown in FIG. 4, the water extractor for artificial warm bath disclosed in Japanese Examined Patent Publication No. 60-47858 contains an outer cylinder 60 accommodating an organic carboxylic acid aqueous solution 61 and uranium, thorium, etc. in its inner space. A powder 64 of a radioactive substance is stored, filters 65 and 66 are attached to the upper and lower openings, and an inner cylinder 63 arranged vertically (up and down) in an outer cylinder 60 is provided.
Further, a pump 68 is provided on the pipe 67 arranged between the inner cylinder 63 and the outer cylinder 60, and the organic carboxylic acid aqueous solution 61 in the inner cylinder 63 is pumped up and supplied to the outer cylinder 60. As a result, the organic carboxylic acid aqueous solution 61 on the upper part of the inner cylinder 63 passes through the outer cylinder 60, the lower filter 66, the radioactive substance powder 64 and the upper filter 65, and the decay products of the radioactive substance powder 64 are removed during the period. Extraction into the organic carboxylic acid aqueous solution 61 in the cylinder 60 provides an extraction aqueous solution 69.

Another conventional example of an artificial warm water extractor is disclosed in Japanese Patent Publication No. 6-48320. In this artificial warm bath water extraction device, as shown in FIG. 5, an extraction tank 70 containing an organic acid or inorganic acid aqueous solution 72 is stored.
Ore granules 74 with a grain size of 0.2 to 0.5 mm inside
And a cylindrical stirring tank 80 in which the upper and lower openings are respectively covered by the upper filter 76 and the lower filter 78 are arranged in the vertical (vertical) direction. The organic acid or inorganic acid aqueous solution 72 in the extraction tank 70 is heated by the heater 81 attached to the extraction tank. In addition, the gas in the upper part of the extraction tank 70 is guided to the lower part of the stirring tank 80 by the pipe line 82 and the pump 83 and jetted from the nozzle 84 toward the lower filter 78, thereby stirring the ore granules 74 in a floating state, The bubbles generated when the inorganic acid or organic acid aqueous solution 72 passes through the lower filter 78 bursts and vibrates the ore granules 74. This improves the frequency of contact between the inorganic acid or organic acid aqueous solution 72 and the ore granules 74 and between the ore granules 74. The extraction aqueous solution 86 in the lower part of the extraction tank 70 is introduced into the gas by being guided to the upper part of the stirring tank 80 by the pipe line 88 and the pump 89 and jetted from the nozzle 90 at the water surface of the inorganic acid or organic acid aqueous solution 72. The gaseous decay products are dissolved in the aqueous solution 72.

[0004]

However, the above-mentioned conventional water extractor for artificial warm bath has the following problems. In the water extractor for hot bath shown in FIG. 4, the organic carboxylic acid aqueous solution 61 in the upper part of the inner cylinder 63 is piped so as to stir and contact the powder 64 of the radioactive substance and the organic carboxylic acid aqueous solution 61 in the inner cylinder 63. It is forcibly pumped up by the 67 and the pump 68 and supplied to the outer cylinder 60. However, the line 67 and the pump 6
The suction by 8 is performed from the outside of the inner cylinder 63 to the upper filter 65.
Since it is carried out over, the suction force is reduced by the upper filter 65, and the powder 64 in the inner cylinder 63 and the organic carboxylic acid aqueous solution 61 are stirred only negatively. If the suction force of the pipe 67 and the pump 68 is excessively increased, the radioactive substance powder 64 will pass through the upper filter 65 and be mixed into the organic carboxylic acid aqueous solution 61, or in the worst case, the upper filter 65 will be damaged. There are also things to do.

On the other hand, in the water extractor for artificial warm bath shown in FIG. 5, the ore granules 74 are powdered with a particle size of 0.2 to 0.5 mm. It is desirable to increase the contact area between the ore granules 74 and the organic acid or inorganic acid aqueous solution 72. However, also in this conventional example, the ore granules 74 and the organic acid or inorganic acid aqueous solution 72 in the stirring tank 80 are stirred from the outside of the stirring tank 80. That is, by injecting the gas above the extraction tank 70 from the nozzle 84 toward the lower filter 78, the ore granules 74 and the organic acid or inorganic acid aqueous solution 72 in the stirring tank 80 are injected.
And are being stirred through the lower filter 78. for that reason,
The momentum of the gas injection from the nozzle 84 is the lower filter 78.
And the ore granules 74 and the organic acid or inorganic acid aqueous solution 72 are stirred only passively. As a result, it is difficult to say that the extraction efficiency of the decay products into the organic acid or inorganic acid aqueous solution 72 can be sufficiently improved while using the ore granules 74. Further, since the injection of gas from the nozzle 84 is blocked by the lower filter 78 and does not reach the inside of the stirring tank 80 sufficiently, the ore granules 74 are easily deposited on the lower filter 78.

Therefore, the above-mentioned gas injection from the nozzle 84 stirs the ore granules 74 in a floating state, and the organic acid or inorganic acid aqueous solution 72 is added to the lower filter 78.
It is hard to say that the action of bursting the bubbles generated when passing through and vibrating the ore granules 74 can be surely obtained. Further, when the ore granules 74 are deposited on the lower filter 78, it is difficult for the organic acid or inorganic acid aqueous solution 72 in the stirring tank 80 to pass downward through the lower filter 78.
It becomes difficult to discharge the extraction aqueous solution 86 from the discharge pipe 92 at the bottom of 0. In the meantime, if the particle size of the ore granules 74 is increased, the gas injected from the nozzle 84 will be in the lower filter 7
8 and the organic acid or inorganic acid aqueous solution 72 in the stirring tank 70 easily passes downward through the lower filter 78, but the efficiency of extraction of the core decay products into the organic acid or inorganic acid aqueous solution 72 is high. Is greatly reduced. In addition, in this conventional example, since the stirring tank 80 is arranged in the vertical direction and the upper filter 76 and the lower filter 78 are attached to the upper opening and the lower opening, respectively, a large amount (10
When the ore granules 74 (0 kg or more) are stored, it is not possible to support only the lower filter 78, and the lower surface of the lower filter 78 needs to be supported by a supporting member (not shown). As a result, the area through which the gas ejected from the nozzle 84 can pass through the lower filter 78 is reduced by an area corresponding to the area of the support member, which accelerates the reduction in extraction efficiency of the decay products.

The present invention has been made in view of the above circumstances, and ore grains or ore powder (hereinafter abbreviated as "ore powder") containing a radioactive substance and an acidic aqueous solution form a filter in a stirring tank. The purpose of the present invention is to provide an artificial warm bath water extraction device that can be actively stirred by a stirrer without being hindered and can improve the extraction efficiency of a decay product into an acidic aqueous solution.

[0008]

In order to achieve the above object, as described in claim 1, an ore powder containing a radioactive substance is brought into contact with an acidic aqueous solution to form a decay product of the ore powder. A water extractor for an artificial warm bath for extracting the decay product into the acidic aqueous solution by dissolving it in an acidic aqueous solution includes an extraction tank for containing the acidic aqueous solution and a radioactive substance inside the extraction tank. A stirring tank in which ore powder is stored and at least one side wall portion of which is provided with a vertically extending filter, and a jet port which is disposed in the stirring tank close to the bottom wall portion and is open in a direction not facing the filter. , A stirrer consisting of a pipe and a pump for guiding the fluid in the extraction tank to the ejection port, and a stirrer for contacting the acidic aqueous solution with the ore powder containing radioactive substances by the fluid ejected from the ejection port and the acidic aqueous solution in the extraction tank. A discharge line for discharging the extraction solution strange product was extracted from the extract Deso, characterized by having a. In the artificial warm water extractor of the present invention, the stirring tank disposed in the extraction tank has a filter extending in the vertical direction on at least one side wall portion, and the ore powder flowing laterally together with the acidic aqueous solution is outside the stirring tank. Prevent outflow. The jet outlet of the stirrer, which is located in the stirring tank close to its bottom wall, jets the fluid (acidic aqueous solution or air) in a direction that does not face the filter and positively discharges the acidic aqueous solution and ore powder in the stirring tank. Vigorously stir. According to a second aspect of the present invention, there is provided the artificial warm bath water extracting device according to the first aspect, in which two filters are vertically mounted on two opposing side wall portions of the stirring tank. According to a third aspect of the present invention, in the water extractor for artificial warm bath according to the second aspect, the stirrer is located between the two filters in the lateral direction of the stirring tank, the ejection port is opened downward, and the acidic aqueous solution is directed toward the bottom wall. Gush downwards. According to a fourth aspect of the present invention, in the water extractor for artificial warm bath according to the first aspect, the jet port of the stirrer is opened upward and the air in the upper space of the extraction tank is jetted upward.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION 1) A stirring tank arranged in an extraction tank containing an acidic aqueous solution should contain ore powder inside and a part of its wall should be covered with a filter. Therefore, the stirring tank can have a rectangular box shape, a cylindrical shape, a hollow sphere shape, or the like. The filter can cover one surface or two or more surfaces when the stirring tank has a box shape, and can cover one end surface or both end surfaces when the stirring tank has a cylindrical shape.
However, considering that the acidic aqueous solution in the extraction tank flows into and out of the stirring tank, it is desirable that the filters are provided on at least two surfaces of the stirring tank. The filter can be made of, for example, a sintered alloy made of stainless steel. The agitation tank may be arranged in the extraction tank in a vertical (vertical) direction or in a horizontal (horizontal) direction, and thus the filter can be attached to the upper surface, the lower surface or the side surface of the stirring tank. Well-known monazite or the like can be used as the ore containing the radioactive substance stored in the stirring tank, and the ore powder can be, for example, tens of micrometers (microns). The decay products are thoron, radon gas, and the like. 2) A stirrer, which is arranged in the stirring tank and ejects the fluid, and a conduit and a pump for guiding the fluid in the extraction tank to the ejection port, ejects the acidic aqueous solution in the extraction tank from the ejection port. Alternatively, the gas in the extraction tank can be jetted. When the acidic aqueous solution is jetted from the jet outlet, the pipe extends, for example, from the bottom of the extraction tank to the jet outlet in the stirrer, and a liquid pressure pump is arranged on the pipe. When ejecting gas from the ejection port, the pipe extends from the upper space of the extraction tank to the ejection port in the stirrer, and a gas pressure pump is arranged on the pipe. The ejection port can be arranged in any direction in the stirring tank, but its arrangement is determined in relation to the mounting position on the filter, and it is desirable that the fluid ejected from the ejection port does not directly face the filter. 3) The discharge pipeline for discharging the extraction aqueous solution from the extraction tank includes the pipeline and a pump for pumping the liquid arranged above the pipeline. When the jet outlet of the stirrer jets the acidic aqueous solution in the extraction tank, a part of the stirrer conduit and a part of the discharge conduit can be shared. By thus sharing the pipeline and the pump, the configurations of the pipeline and the pump are simplified as compared with the case where both are separately provided. The acidic aqueous solution used in the extraction apparatus of the present invention should be prepared, for example, by mixing hot water with an organic acid or an inorganic acid, or by mixing cold water with an organic acid or an inorganic acid and then heating the mixture. You can Further, the extraction aqueous solution obtained by extracting the decay product from the acidic aqueous solution by the extraction apparatus of the present invention is then adjusted to cold water or a pH suitable for bathing by adding a pH adjusting agent.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the artificial warm water extraction device according to the present invention will be described below with reference to the accompanying drawings. As shown in FIG. 1, the artificial warm bath water extraction device 10 includes an extraction tank 12 containing an organic carboxylic acid aqueous solution 43 and an ore powder 17 in an internal space.
A stirring tank 16 in which is housed and which has a pair of filters 19;
It has a stirrer 24 having a pipe 33 with a nozzle 32 arranged in the stirring tank 16 and discharge pipes 26, 37 for discharging the extraction aqueous solution 35. The extraction tank 12 is composed of a container-shaped main body 13 having an upper portion opened and containing the organic carboxylic acid aqueous solution 43 in its internal space, and a lid 14 covering the upper opening of the main body 13. The organic carboxylic acid aqueous solution 43 is shown in FIG.
It is adjusted in the aqueous solution adjusting device 40 shown in FIG. In this aqueous solution conditioning apparatus 40, the water supply pipe 41 is used to
The 0 ° C. hot water is introduced and the organic carboxylic acid is supplied from the supply port 42, and the both are mixed to prepare the organic carboxylic acid aqueous solution 43 of pH 1.5 to 3.5. The organic carboxylic acid aqueous solution 43 is sent to the extraction device 10 through a pipe or a supply line 44. Returning to FIG. 1, the magnets 45 arranged on the supply conduit 44 make the clusters of the organic carboxylic acid aqueous solution 43 finer to facilitate absorption by the human body.

The stirring tank 16 has an opening at both ends, and an extremely fine powder of monazite 17 having a powder diameter of about 40 μm in its internal space.
And a pair of left and right circular filters 19 covering openings at both ends of the cylindrical member 18. The filter 19 is made of a sintered alloy made of stainless steel,
The central portion thereof is slightly projected in the thickness direction, and is attached to the cylindrical member 18 so that the protruding direction is the axially outer side of the cylindrical member 18. The internal pressure of the stirring tank 16 is about 1 kg / c
It is set to m ² . The stirring tank 16 is arranged in the extraction tank 12 such that the longitudinal direction thereof is substantially horizontal (the horizontal direction in FIG. 1), and is completely immersed in the organic carboxylic acid aqueous solution 43 stored in the extraction tank 12. In the state, the leg member 21
Is fixedly supported on the bottom plate 15 of the extraction tank 12.

A stirrer 24 disposed inside the stirring tank 16
Is a pipe 33 provided with a plurality of nozzles 32 and arranged inside the stirring tank 16, a pipe line 26 extending from the bottom of the extraction tank 12, on which a pump 27 and a heater 28 are arranged,
A circulation pipe 29 is branched from the pipe 26 and extends to the pipe 33 in the stirring tank 16. The plurality of nozzles 32 are formed downward on the pipe 33, and the lower end (tip) of the circulation pipe 29 is connected to the middle portion of the pipe 32. The pipe 33 is arranged inside the stirring tank 16 in the longitudinal direction of the stirring tank 16 (left-right direction in FIG. 1), and the nozzle 32 faces the bottom portion of the stirring tank 16.

At the time of extracting the extraction aqueous solution 35, the three-way switching valve 38 is switched, and the pump 27 extracts the extraction aqueous solution 3
5 is made to flow from the pipeline 26 to the circulation pipeline 29. Pipeline 2 at this time
The extraction aqueous solution 35 flowing through the inside 6 is heated by the heater 28. The stirrer 24 injects the extraction aqueous solution 35 supplied by the pipe 26 and the pump 27 from the nozzle 32 toward the bottom of the stirring tank 16 in the stirring tank 16, and stirs the ore powder 17 and the organic carboxylic acid solution 43 by the jet flow. do it,
The organic carboxylic acid aqueous solution 43 is positively brought into contact with the ore powder 17. At that time, since the ore powder 17 has an extremely fine powder diameter of about 40 μm, the contact area with the organic carboxylic acid aqueous solution 43 increases, and the extraction efficiency improves accordingly. In addition, the nozzle 32
Since there is no filter 19 in front of, the momentum of the jet of the extracted aqueous solution 35 ejected from the nozzle 32 is not reduced by the filter 19. Furthermore, since the filters 19 on both sides of the stirring tank 16 are made of a sintered alloy made of stainless steel and extend in the vertical direction, the ore powder 17 is extremely fine, but the filters 19 are unlikely to be clogged. In addition, since the ore powder 17 is stored by the cylindrical member 18 supported by the leg member 21, a large amount of the ore powder 17 can be stored in the stirring tank 16, and the extraction efficiency of the metamorphic organisms is improved accordingly. To do. As a result, almost all the decay products of the ore powder 17 in the stirring tank 16 are positively dissolved in the organic carboxylic acid aqueous solution 43, and the decay products are extracted into the organic carboxylic acid aqueous solution 43. The extraction aqueous solution 35 thus obtained in the extraction device 10 has a temperature of 80 to 95 degrees, a pH of 1.5 to 3.5, and a dose of 20 to 400 pine.

The discharge conduit for discharging the extraction aqueous solution 35 from the bottom of the extraction tank 12 is the conduit 26 in which the pump 27 and the heater 28 are arranged, and the adjusting device 45 shown in FIG.
And a conduit 37 extending to the. That is, in this embodiment, the pipeline 26 having the pump 27 and the heater 28 is shared by the circulation pipeline and the discharge pipeline. Extraction aqueous solution 3
When discharging 5, the three-way switching valve 38 is switched to
6 is connected to the line 37. The adjusting device 45 shown in FIG.
Supply port 4 to which the extraction aqueous solution 35 is supplied from the pipe 37
6, a cold water or hot water supply port 47, and a pH adjusting agent supply port 48. Cold or hot water, and an aqueous solution suitable for a warm bath by adding a pH adjusting agent (temperature 40 to 50
Degree, pH 5.5 to 8. The dose is adjusted to 5 to 30 pine), and this aqueous solution is taken out from the conduit 48 and used for bathing.

FIG. 3 shows another embodiment of the present invention. In this embodiment, only one surface of the stirring tank 50 is covered with the filter 51, the fluid ejected from the ejection port 53 is a gas, and the pipe 54a of the agitator 52 and the pump 5 are provided.
4b and the discharge conduits 59a and 59b are separately provided, which is different from the above embodiment. More specifically, the stirring tank 50 has a rectangular box shape with only one surface (left side surface in FIG. 3) open, and one surface thereof is covered with a filter 51. Jet port 5 of stirrer 52 arranged in stirring tank 50
3 jets gas in the upper part of the extraction tank 55 pumped by the pipe 54 a and the pump 54 b upward in the stirring tank 50. Thereby, the ore powder 56 and the acidic aqueous solution 57a in the stirring tank 50 are positively stirred by the gas bubbles. The acidic aqueous solution 57a in the extraction tank 55 is heated by the heater 58 attached to the extraction tank 55. The extraction aqueous solution 57b in the lower part of the extraction tank 55 is discharged by a pipe 59a and a liquid pressure pump 59b. According to this embodiment, since the fluid ejected from the ejection port 53 of the stirrer 52 is a gas, compared with the case of ejecting the liquid from the ejection port of the stirrer, the ejection port 53 and the pipe forming the stirrer 52 are compared. 54a
Also, the pump 54b can be made relatively simple.

[0016]

As described above, according to the water extractor for artificial warm bath of the present invention, the acidic aqueous solution and the ore powder are agitated by the fluid ejected from the ejection port of the agitator arranged in the agitation tank. The mixture is actively stirred in the tank, the frequency of contact between the two is increased, and the extraction efficiency of the decay products into the acidic aqueous solution is improved. Further, since the stirring tank has a filter extending in the vertical direction on at least one side wall portion, when the acidic aqueous solution flows laterally from the inside of the stirring tank to the outside, there is no concern that ore powder is deposited. Furthermore, since the fluid is ejected from the ejection port in a direction that does not face the filter and the ore powder does not directly collide with the filter, the ore powder is unlikely to deposit on the filter.

[Brief description of drawings]

FIG. 1 is a front sectional view showing a first embodiment of a water extractor for artificial warm bath according to the present invention.

FIG. 2 is an explanatory view showing an adjusting device connected to the artificial water bath water extracting device.

FIG. 3 is a front sectional view showing a second embodiment of the water extractor for artificial warm bath according to the present invention.

FIG. 4 is a front sectional view showing an example of a conventional water extractor for artificial warm bath.

FIG. 5 is a front cross-sectional view showing another example of the conventional water extractor for artificial warm bath.

[Explanation of symbols]

10: Water extractor for artificial warm bath 12: Extraction tank 16: Stirring tank 17: Ore powder 19: Filter 24: Stirrer 26, 37: Discharge pipe line 26, 29: Pipe line 27: Pump 32, 33: Jet port 35: Extraction aqueous solution

Claims (4)

(57) [Claims] 1. A method for extracting a decay product of an ore powder containing a radioactive substance into the acidic aqueous solution by bringing the acidic product into contact with the acidic aqueous solution and dissolving the decay product of the ore powder in the acidic aqueous solution. A water extraction device for artificial warm bath, comprising: an extraction tank for containing the acidic aqueous solution; and an ore powder containing the radioactive substance inside the extraction tank , the vertical direction being provided on at least one side wall portion.
A stirred tank filter is mounted extending, it is arranged close to the bottom wall portion to the stirring tank in the Fi
And a pipe for guiding the fluid in the extraction tank to the ejection port, and a fluid ejected from the ejection port produces ore powder containing the radioactive substance. An artificial warm bath water extraction characterized by having a stirrer for contacting the acidic aqueous solution, and a discharge pipeline for discharging the extraction aqueous solution in which the decay products have been extracted into the acidic aqueous solution in the extraction tank from the extraction tank. apparatus. 2. Two abutting side walls of the stirring tank
Contracts in which both of the filters are installed vertically
The water extractor for artificial warm bath according to claim 1 . 3. The stirrer is in the lateral direction of the stirring tank.
Located between the two filters, the jets pointing downwards
To open the acidic aqueous solution downward toward the bottom wall.
The artificial water bath water extraction device according to claim 1, which ejects water. 4. The jet port of the stirrer is opened upward,
The air in the upper space of the extraction tank is jetted upward.
The artificial water bath water extraction device according to.