JPS62180730A - Device for separating metallic isotope - Google Patents

Abstract

PURPOSE:To surely recover a liq. in a recovery vessel by forming plural grooves of specified structure on the surface of a recovery plate, and preventing the detachment and falling of liq. droplets from the surface of the recovery plate. CONSTITUTION:Metal vapor is condensed in the form of a liq. or a solid on the recovery plate. Plural grooves 9 simultaneously satisfying the equations I, II, and III regarding the groove depth h(m), the surface tension sigma(kgf/m) of the liq. metal at the working temp., the inclination phi( deg.) of the inclined face of the groove, and the specific weight gamma(kgf/m<3>) of the liq. metal at the working temp. are formed on the surface of the recovery plate 7 for condensing or coagulating metal vapor in the form of a liq. or a solid. Consequently, liq. droplets are not irregularly agglomerated and grown on the recovery plate 7, the detachment and falling of liq. droplets from the surface of the recovery plate 7 are controlled, the liq. flows along the groove 9, and hence the liq. can be surely recovered in the recovery vessel 8.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an isotope recovery plate for a laser-based isotope separation device, such as a uranium recovery plate for a laser-based uranium enrichment device.

[Conventional technology]

Figure 2 shows an overview of a laser-based uranium enrichment device.

Raw material uranium 3 in a crucible 2 in a vacuum chamber 1 is heated by an electron beam 4 and evaporated into a metal vapor stream 5. This metal vapor flow is irradiated with a laser beam of a specific wavelength when passing between the product collection plate group 6, and only specific isotopes are ionized. Ions of a specific isotope generated by ionization are deflected by the electromagnetic field applied to this region and collected on the product collection plate 6, while non-ionized atomic flows are collected on the waste product collection plate 7.

When both collection plates are held at a temperature higher than the melting point of the metal to be collected, the metal condenses on the collection plate surface and flows over the collection plate in a liquid state into the collection container 1 and the collection container 8 (in the case of a waste collection plate). collected inside.

In the conventional model, the surface of this collection plate is smooth, so it is easy to use. [Problems to be Solved by the Invention] In the conventional apparatus, as described above, since the metal condensation surface is smooth, the condensed liquid coagulates and grows irregularly in the form of drops. Since some of the waste collection board and product collection board face downward, the growing droplets detach from the collection board surface, fall, and fall into the collection container 8.
etc., it may not be possible to collect it.

[Means for solving problems]

In order to solve this problem, the present invention provides a collection plate that condenses or condenses metal vapor in a liquid or solid state, with a groove depth hC, , , groove slope inclination angle d [degrees],
Surface tension σ of liquid metal at operating temperature [#17. ．．
), provides a metal isotope separation device characterized in that a plurality of grooves are formed on the surface of the collection plate to allow liquid to flow at the operating temperature.

[Effect]

In the present invention, with such a configuration, the liquid condensed on the collection plate flows along the grooves, and even if droplets aggregate in one groove, there is no interference with other grooves, so the liquid condensed on the collection plate flows irregularly. There is less worry about local droplets agglomerating, coalescing, and falling.

[Example] 1□18 *5@8JJ. Let me explain the mechanical balance of the liquid that is maintained.

2σcosψ= W +11
Regarding the formula, (where ψ= 180'-〇-(90°-φ) (2) W
: Weight of the liquid (unit length along the groove) [#//m] σ: Surface tension of the liquid Ckgf/,,] φ: Inclination angle of the groove slope [degrees] θ: Contact angle between the liquid and the surface [degrees] ψ: Angle between the liquid surface line of the contact area and the direction of movement [degrees]) In the same equation, if the right side is larger than the left side, droplets will fall, so the groove dimensions should be selected within a range that will not cause them to fall.

An example of the shape of the groove 9 on the surface of the recovery plate for collecting uranium metal is as follows: 1, W=-·r.

From equations (1) and (2), “＝亙＝・?・8°10−″・ ri', r*=2'x16-"m is obtained.

□ To explain an example of the direction of the grooves 9 on the surface of the waste collection plate, as shown in FIG. to flow into.

The □ groove 9 is also effective when the collection plate is lowered to below the melting point of the metal to be collected to collect it in a solid state, and then separately heat it to liquefy it and collect it flowing down. A groove 9 may be formed along the line.

It is also possible to change the groove width in the longitudinal direction of the groove 9 to make it tapered, to make a difference in the surface tension in the longitudinal direction of the groove, and to apply a driving force that actively causes the flow to flow down in one direction, especially when the collection plate is on a horizontal surface. This is effective when gravitational effects cannot be expected near .

〔Effect of the invention〕

The present invention has the following effects: (1) Irregular agglomeration of droplets on the collection plate due to the groove structure;
There is no growth, and there is no separation or fall of droplets from the collection plate surface.

(2) Since the liquid flows along the groove, the liquid can be reliably collected into the collection container.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of the cross-sectional shape of a groove as an embodiment of the present invention, Fig. 2 shows an outline of a uranium enrichment device, and Fig. 3 is a diagram showing the direction of a groove as an embodiment of the present invention. . 7... Collection plate, 8... Collection container, 9... Groove. Figure 1

Claims (1)

[Claims] In a recovery plate that condenses or condenses metal vapor in a liquid or solid state, the groove depth h [m], the groove slope inclination angle φ [degrees], and the surface tension of the liquid metal at the operating temperature a [ k
gf/m], the specific weight of the liquid metal at the operating temperature r[k
gf/m^3], 30°≦φ≦60°, 0.7h
_0≦h<1.3h_0, h_0=√{(4a)/[√
(2) A metal isotope separation device characterized in that a plurality of grooves that simultaneously satisfy the following equation are formed on the surface of the collection plate.