JP5575933B2 - Aluminum melt treatment equipment - Google Patents

Description

  The present invention relates to a molten aluminum treatment apparatus in which a processing gas is blown into molten aluminum.

  The molten aluminum before casting contains non-metallic inclusions such as aluminum oxide and magnesium oxide, and debris such as impurities. Casting a molten aluminum containing waste will cause defects in the cast product, so it is necessary to remove the waste in the molten metal.

  Conventionally, as a method for removing debris in molten aluminum, an inert gas such as argon gas (Ar gas) is dispersed and blown into the molten metal in a fine bubble state, and the debris is melted on the surface of the melt by bubbling action. Many methods are used to remove the surface.

  For example, in the molten aluminum processing apparatus shown in Patent Document 1 below, a hot water passage and a hot water outlet are connected to the side wall of the hot water tank, and the molten metal flows into the hot water tank from the end opening (hot water inlet) of the hot water path. On the other hand, the molten metal stored in the hot water storage tank flows out from an end opening (a hot water outlet) of the hot water outlet.

  In such a molten aluminum treatment apparatus, in order to obtain a high-quality molten aluminum, it is preferable to shut off from the outside air, and in order to avoid inadvertent release of inert gas into the atmosphere, It is desirable that the inside of the tank is cut off from the outside air.

Japanese Patent Publication No. 61-40736

  However, the above-mentioned conventional molten aluminum treatment apparatus uses a bowl-shaped (groove-shaped) shape with an open upper part as a member for the hot water path, and from the upper end of the side wall of the hot water tank through the vertical hot water path. The molten metal was allowed to flow into the tank. For this reason, the hot water storage tank was open | released outside via the vertical hot water path, and the inside of the tank had the subject that it was not interrupted | blocked by external air.

  This invention is made in view of said subject, and it aims at providing the molten aluminum processing apparatus which can interrupt | block the inside of a hot water storage tank easily and reliably with external air.

  In order to achieve the above object, the present invention comprises the following arrangement.

[1] a sealed hot water tank in which molten aluminum is stored;
A cylindrical seal member penetrating in a sealed state in the upper wall of the hot water storage tank;
A processing gas blowing shaft that is disposed through the cylindrical seal member and from which a processing gas is released in a bubble state into the molten metal from a lower end disposed below the molten liquid surface,
A hot water pipe that penetrates the peripheral wall of the hot water tank in a sealed state, has a hot water inlet provided in the tank inlet, and allows molten aluminum supplied from outside the tank to flow into the hot water tank through the hot water inlet Road,
A hot water outlet pipe that is penetrated in a sealed state in the peripheral wall of the hot water storage tank, a hot water outlet is provided in the tank inlet, and the molten aluminum in the hot water tank flows out of the hot water tank through the hot water outlet, With
The lower end of the cylindrical seal member, the hot water inlet and the hot water outlet are disposed below the molten liquid surface,
In the hot water storage tank, the molten metal surface is sealed with respect to the inside of each of the cylindrical seal member, the hot water inlet pipe, and the hot water outlet pipe by the molten aluminum. apparatus.

  [2] The molten aluminum treatment apparatus according to [1], configured to be able to recover the exhaust gas that fills the molten metal surface in the hot water tank.

  [3] The molten aluminum processing apparatus according to item 1 or 2, wherein the hot water tank has a hot water tank body having an opening at an upper end and a closing lid for closing the upper end opening of the hot water tank body.

  [4] The molten aluminum treatment apparatus according to any one of items 1 to 3, wherein the hot water inlet is disposed in a surface layer portion of the molten metal to be stored.

  [5] The molten aluminum treatment apparatus according to any one of items 1 to 4, wherein the outlet is disposed in a deep layer portion of the molten metal to be stored.

  [6] The molten aluminum treatment apparatus according to any one of items 1 to 5, wherein the hot water inlet is disposed higher than the hot water outlet.

[7] The shaft is configured to be rotatable around an axis,
The rotation of the shaft is configured to generate a rotating flow in the molten metal in the storage tank,
7. The molten aluminum treatment apparatus according to any one of the preceding items 1 to 6, wherein a rectifying plate that causes the molten aluminum to flow upward is provided on a lower side portion of the inner peripheral wall surface of the hot water tank.

  [8] The molten aluminum processing apparatus according to [7], wherein a plurality of the current plates are provided at intervals in the molten metal rotation direction.

  [9] The molten aluminum processing apparatus according to item 7 or 8, wherein an upper end of the current plate is disposed lower than a lower end of the cylindrical seal member.

  [10] The molten aluminum treatment apparatus according to any one of [7] to [9], wherein a waste pool portion for collecting waste is provided on the inner surface of the peripheral wall of the hot water storage tank.

  [11] The molten aluminum processing apparatus according to [10], wherein the hot water storage tank is formed in a rectangular shape in plan view, and one corner portion of the hot water storage tank is configured as the waste pool part.

  [12] The molten aluminum treatment apparatus as described in [10] or [11], wherein a debris stop plate is provided on the inner wall surface of the hot water storage tank to receive debris floating on the melt surface and collect in the debris reservoir.

[13] An opening is provided in the peripheral wall of the hot water storage tank so as to correspond to the dregs reservoir.
Outside the hot water storage tank, a sealed-type dregs recovery unit communicating with the dregs reservoir through the opening is provided,
13. The molten aluminum processing apparatus according to any one of the preceding items 10 to 12, wherein the waste collected in the waste pool part is recovered by the waste recovery part through the opening.

[14] A dam plate is provided at the lower edge of the opening,
14. The molten aluminum treatment apparatus according to 13 above, wherein the waste collected in the waste pool part overflows the dam plate and is recovered in the waste recovery part.

  [15] The molten aluminum treatment apparatus according to [13] or [14], wherein a waste discharging means is provided for discharging the waste recovered in the waste recovery unit to the outside in a state where the atmosphere is shut off from the hot water storage tank. .

  [16] The molten aluminum treatment apparatus according to item 12 above, wherein a drawing-in portion in the tank of the tapping pipe line is disposed on the downstream side in the molten metal rotation direction of the waste stopper plate.

  [17] The molten aluminum treatment apparatus according to any one of items 7 to 16, wherein the hot water inlet is opened sideways along the molten metal rotation direction.

  [18] The molten aluminum processing apparatus according to any one of the above items 1 to 17, wherein a tank internal pressure adjusting means for adjusting an air pressure above the melt liquid level in the hot water storage tank is provided.

  [19] The molten aluminum processing apparatus according to any one of items 1 to 18, wherein an inflow hole for allowing molten metal to flow in is provided in a peripheral wall of the cylindrical seal member.

[20] On the inner peripheral surface of the cylindrical seal member, an inner peripheral line portion composed of a concave portion or a convex portion is provided in a spiral shape,
20. The molten aluminum treatment apparatus according to any one of the preceding items 1 to 19, wherein the molten metal in the cylindrical seal member is guided downward by the inner peripheral line portion.

[21] On the outer peripheral surface of the shaft, an outer peripheral linear strip portion including a concave strip portion or a convex strip portion is provided in a spiral shape,
21. The molten aluminum treatment apparatus according to any one of the preceding items 1 to 20, wherein the molten metal around the shaft is guided downward by the outer peripheral line portion.

  [22] The molten aluminum treatment apparatus according to any one of items 1 to 21, wherein a blade for assisting generation of a rotating flow is provided on an outer peripheral surface of the shaft.

  [23] The molten aluminum treatment apparatus as described in any one of [1] to [22], wherein the exhaust gas collected by the exhaust gas outer peripheral means is purified and reused as a treatment gas.

[24] a sealed hot water tank;
A cylindrical seal member penetrating in a sealed state in the upper wall of the hot water storage tank;
A processing gas blowing shaft that is inserted through the cylindrical seal member and from which a processing gas is discharged into the molten metal from the lower end,
A hot water pipe that penetrates the peripheral wall of the hot water tank in a sealed state, has a hot water inlet provided in the tank inlet, and allows molten aluminum supplied from outside the tank to flow into the hot water tank through the hot water inlet Road,
A hot water outlet pipe that is penetrated in a sealed state in the peripheral wall of the hot water storage tank, a hot water outlet is provided in the tank inlet, and the molten aluminum in the hot water tank flows out of the hot water tank through the hot water outlet, A method for treating molten aluminum in a gas bubbling device comprising:
The molten aluminum is stored in the hot water storage tank so that the lower end portion of the shaft, the lower end of the cylindrical seal member, the hot water inlet and the hot water outlet are arranged below the surface of the molten metal, In the hot water storage tank, the molten metal liquid surface is hermetically sealed with respect to the inside of each of the cylindrical seal member, the hot water supply pipe line and the hot water discharge pipe line by molten aluminum,
A method for treating molten aluminum in a gas bubbling device, wherein in a sealed state, a processing gas is discharged in the form of bubbles from the lower end of the shaft into the molten metal.

  In this specification, the term “aluminum” is used to include pure aluminum, aluminum containing a small amount of impurities, and an aluminum alloy. The term “inert gas” is used to include nitrogen gas and the like that are inert to aluminum in addition to argon gas and helium gas in the periodic table.

  According to the molten aluminum treatment apparatus of the invention [1], the molten metal can be treated in a sealed state.

  According to the molten aluminum treatment apparatus of the invention [2], it is possible to reliably prevent the exhaust gas from being released to the atmosphere.

  According to the molten aluminum treatment apparatus of the invention [3], it is possible to easily form a molten metal tank having a sealed structure.

  According to the aluminum melt treatment apparatus of the invention [4] to [6], it is possible to reliably obtain the optimum flow characteristics for debris removal by bubbling action.

  According to the molten aluminum treatment apparatus of the invention [7], it is possible to generate a predetermined rotational flow in the molten metal, and it is possible to easily collect the residue floating on the molten metal surface.

  According to the molten aluminum treatment apparatus of the inventions [8] to [12], the rotational flow of the molten metal can be stabilized, and the residue floating on the molten metal surface can be more easily recovered.

  According to the molten aluminum treatment apparatus of the inventions [13] and [14], the residue floating on the molten metal surface can be collected almost automatically.

  According to the molten aluminum treatment apparatus of the invention [15], the recovered waste can be easily discharged.

  According to the molten aluminum treatment apparatus of the invention [16], the tank installation parts can be efficiently arranged in terms of space.

  According to the molten aluminum treatment apparatus of the invention [17], it is possible to reliably obtain flow characteristics suitable for debris removal.

  According to the molten aluminum treatment apparatus of the invention [18], the height of the molten metal surface can be controlled, and the recovery of waste can be easily performed.

  According to the molten aluminum treatment apparatus of the invention [19] to [22], the rotational flow of the molten metal can be further stabilized, and the recovery of waste can be performed more easily.

  According to the molten aluminum treatment apparatus of the invention [23], the problem of natural environment protection can be surely dealt with by recycling the gas.

  According to the invention [24], it is possible to provide a molten aluminum treatment method for a gas bubbling device having the same effects as described above.

It is a front / side sectional view showing an aluminum melt processing device which is an embodiment of this invention. It is a plane sectional view showing the aluminum melt processing device of an embodiment. It is front sectional drawing of the state at the time of normal operation in the molten aluminum processing apparatus of embodiment. It is front sectional drawing of the state at the time of waste collection | recovery in the molten aluminum processing apparatus of embodiment. It is front sectional drawing of the state at the time of the waste discharge in the molten aluminum processing apparatus of embodiment. It is a front view which shows the dam board periphery of the waste collection pocket in the molten aluminum processing apparatus of embodiment. It is front sectional drawing in the dregs stop board part in the aluminum melt processing apparatus of embodiment. It is a block diagram which shows the exhaust gas collection | recovery installation provided in the molten metal processing apparatus of embodiment. It is a front view which shows the 1st modification of the dam board in the dregs collection pocket applicable to this invention. It is a front view which shows the 2nd modification of the dam board in the dregs recovery pocket applicable to this invention. It is a plane sectional view showing the aluminum melt processing device which is other embodiments of this invention. It is a plane sectional view showing an aluminum melt processing device which is another embodiment of this invention. It is sectional drawing which shows the 1st modification of the hot water path applicable to this invention. It is sectional drawing which shows the 2nd modification of the hot water path applicable to this invention. It is a perspective view which shows the 1st modification of the cylindrical seal member applicable to this invention. It is a notch perspective view which shows the 2nd modification of the cylindrical seal member applicable to this invention. It is a figure which shows the 1st modification of the shaft for process gas blowing applicable to this invention, Comprising: The figure (a) is a perspective view, The figure (b) is a top view. It is a block diagram which shows the gas reuse facility provided in the molten metal processing apparatus of embodiment.

  FIG. 1 is a front / side sectional view showing an aluminum melt treatment apparatus according to an embodiment of the present invention, and FIG. 2 is a horizontal sectional view thereof. FIG. 1 is an irregular cross-sectional view for easy understanding of the invention. Specifically, the right half of FIG. 1 shows a front sectional view of one side (right side) of the molten metal processing apparatus, and the left half of FIG. 1 shows a side sectional view of the front side of the molten metal processing apparatus. .

  As shown in both figures, this molten aluminum treatment device constitutes a gas bubbling device, and includes a hot water storage tank (1), a treatment gas blowing shaft (2), a cylindrical seal member (3), and hot water. A conduit (4), a tapping conduit (5), a waste collecting pocket (6), a rectifying plate (71) to (73) and a waste stopper plate (75) are provided as basic components. Yes.

  The hot water storage tank (1) includes a hot water tank main body (11) having an opening at the upper end, and a closing lid (15) for closing the upper end opening of the hot water tank main body (11) in an airtight state (sealed state). I have.

  The hot water tank main body (11) is formed in a rectangular shape in plan view in which the four directions of front, rear, left and right are closed by side walls (peripheral walls). In the following description, the description will be made assuming that the lower side is the front side, the upper side is the rear side, the right side is the right side, and the left side is the left side. Accordingly, in the hot water tank (1) of FIG. 1, the right side wall is shown on the right side and the front side wall is shown on the left side.

  A circular shaft insertion hole (16) is formed in the center of the closing lid (15). The shaft insertion hole (16) is provided with a cylindrical seal member (3) constituting a cylindrical shaft cover. The cylindrical seal member (3) has a cylindrical shape, and its upper end is attached to the inner peripheral end face of the shaft insertion hole (16) in the closing lid (15) in an airtight state (sealed state). ing. Furthermore, the lower end of the cylindrical seal member (3) is configured to be disposed below the liquid level (L1) of the molten aluminum (L) stored in the hot water tank (11). Therefore, although the inside of the cylindrical seal member (3) communicates with the outside air through the shaft insertion hole (16), the atmosphere (the sky) above the melt surface in the hot water storage tank (1) is The molten aluminum (L) is hermetically sealed with respect to the inside of the cylindrical seal member (3) so as to be blocked from outside air.

  A processing gas blowing shaft (2) is disposed inside the cylindrical seal member (3). The shaft (2) is inserted and disposed along the axial center in the cylindrical hole of the cylindrical seal member (3), the upper end is disposed above the hot water tank (1), and the lower end is the hot water tank (1). ) Is placed inside.

  The lower end of the shaft (2) is provided with a disk-shaped process gas discharge member (21) provided with a large number of process gas discharge holes (not shown) on the outer peripheral side surface. The processing gas discharge member (21) is disposed in the vicinity of the bottom surface of the hot water tank (1), that is, in the deep layer portion of the molten aluminum (L) to be stored. In the present embodiment, the processing gas discharge member (21) constitutes the lower end of the shaft (2).

  Inside the shaft (2), a processing gas path (not shown) communicating with the processing gas discharge member (21) from the upper end along the shaft (2) is provided. Further, as shown in FIG. 6, the upper end of the shaft (2) is connected in communication with a gas cylinder as a processing gas supply means (20) via a gas pipe line. Argon gas (Ar gas) as an active gas (processing gas) can be introduced into the upper end of the shaft (2) in a pressurized state. Then, the argon gas introduced from the upper end of the shaft (2) is introduced into the processing gas discharge member (21) at the lower end through the processing gas path inside the shaft, and becomes countless bubbles from there. It is dispersed in the molten metal (L) and discharged.

  Further, the shaft (2) can be rotated around the axis by a rotation driving means (not shown) together with the processing gas discharge member (21), and the shaft (2) and the processing gas discharge member (21) rotate. However, the argon gas is released in a bubble state from the processing gas release member (21), so that innumerable bubbles are released in the molten metal (L) in a state of being evenly distributed in a balanced manner. Yes.

  In the present embodiment, the shaft (2) and the processing gas discharge member (21) are driven to rotate counterclockwise (counterclockwise) in a plan view of FIG. Due to the force, a counterclockwise rotational flow is generated in the molten aluminum (L) stored in the hot water tank (1) as indicated by the black arrow in the figure.

  The hot water inlet pipe (4) is provided at the rear end of one side wall (right side wall) of the hot water tank main body (11). The hot water pipe (4) is constituted by a rectangular tube member (tubular member) whose four sides are closed, and is penetratingly arranged in an airtight state (sealed state) on one side wall of the hot water tank body (11). .

  While the end surface of the part (intake part in a tank) arrange | positioned inside the hot water storage tank (1) in a hot water pipe (4) is obstruct | occluded by the control board (41), A hot water inlet (45) opened downward is formed.

  The hot water supply line (4) is connected to molten aluminum supply means (not shown), and the molten aluminum (L) supplied from the supply means is hot water as shown by white arrows in FIGS. It flows into the hot water storage tank (1) from the hot water inlet (45) through the pipe line (4).

  Furthermore, although the hot water inlet (45) of the hot water pipe (4) is disposed at a relatively shallow position (surface layer portion) in the molten aluminum stored in the hot water tank (1), The circumference is disposed below the liquid level (L1) of the molten aluminum (L), and the interior of the hot water storage tank (1) is in a liquid-sealed state with respect to the interior of the hot water pipe (4). Therefore, even if the inside of the hot water pipeline (4) is open to the atmosphere, the molten metal liquid surface in the hot water tank (1) is sealed against the inside of the hot water pipeline (4) by the molten aluminum (L). It is designed to be cut off from outside air.

  In addition, if at least the in-tank drawing-in part of the hot water inlet pipe (4) is configured by a tubular member that closes the periphery of the circulation path, it is possible to ensure airtightness above the melt surface in the hot water tank (1). it can. That is, in this invention, the part (outside tank drawer | drawing-out part) arrange | positioned on the outer side of the hot water storage tank (1) in the hot water pipe (4) is in the shape of a bowl (groove type) in which the upper peripheral wall of the flow path is opened. It may be formed.

  Furthermore, you may make it comprise in the tank drawing-in part of a hot-water pipe line (4) a part of peripheral wall by a part of hot water storage tank (1). For example, you may make it comprise a part of peripheral wall in the tank drawing-in part of a hot-water pipe line (4) with the obstruction | occlusion lid | cover (15) of a hot water storage tank (1), or the peripheral side wall of a hot water storage tank main body (11). .

  The hot water discharge pipe (5) is provided at the left end of the front side wall of the hot water tank body (11). The hot water discharge pipe (5) is constituted by a rectangular pipe member (tubular member) whose four surrounding sides are closed in the same manner as the hot water supply pipe (4), and is airtight on the front side wall of the hot water tank body (11) ( It is placed through in a sealed state.

  A portion (intake portion in the tank) disposed inside the hot water storage tank (1) in the hot water discharge pipe (5) is bent downward by 90 ° and is downward along the inner surface of the front side wall of the hot water tank body (11). A downwardly extending portion (51) is provided. Further, a hot water outlet (55) opened downward is formed at the lower end surface of the downwardly extending portion (51). The hot water outlet (55) is disposed in the vicinity of the bottom surface of the hot water tank body (11), and is disposed below the processing gas discharge member (21) provided at the lower end of the shaft (2). Accordingly, the entire circumference of the hot water outlet (55) is arranged below the liquid level (L1) of the molten aluminum (L) stored in the hot water storage tank (1).

  The molten aluminum (L) stored in the hot water storage tank (1) flows into the hot water outlet pipe (5) from the hot water outlet (55) as shown by the white arrows in FIGS. It passes through the hot water outlet pipe (5), flows out of the hot water tank (1), and is sent to a casting apparatus or the like.

  Moreover, since the hot water outlet (55) of the hot water discharge pipe (5) is disposed below the molten liquid level (L1) of the hot water storage tank (1), as described above, the inside of the hot water storage tank (1). Is in a liquid-sealed state with respect to the inside of the tapping pipe (5). Therefore, even if the inside of the tapping pipe (5) is open to the atmosphere, the molten liquid surface in the hot water tank (1) is sealed against the inside of the tapping pipe (5) by the molten aluminum (L). It is designed to be cut off from outside air.

  In this hot water discharge pipe (5), as in the case of the hot water supply pipe (4), if at least the tank lead-in part is constituted by a tubular member closing the periphery of the flow path, the hot water storage tank (1) The air tightness over the molten metal surface can be ensured. In other words, in the present invention, the portion (outer tank lead-out portion) arranged outside the hot water storage tank (1) in the hot water discharge pipe (5) has a bowl shape (groove shape) in which the upper peripheral wall of the flow path is opened. It may be formed.

  Furthermore, you may make it the tank drawing-in part of a hot water discharge pipe line (5) comprise a part of peripheral wall by a part of hot water storage tank (1). For example, you may make it comprise a part of peripheral wall in the tank drawing-in part of a hot water discharge pipe line (5) with the obstruction | occlusion lid | cover (15) of a hot water storage tank (1), or the peripheral side wall of a hot water storage tank main body (11). .

  As shown in FIGS. 2 to 4, the waste collection pocket (6) as a waste collection portion is provided on the rear upper side of the other side wall (left side wall) of the hot water tank body (11). The waste collection pocket (6) has a box-type sealed structure with its upper end closed, although the inside communicates with the hot water tank (1) through the opening (61). Is blocked. In this embodiment, the upper wall of the waste collection pocket (6) is constituted by a part of the closing lid (15) of the hot water storage tank (1). However, the present invention is not limited to this, and in the present invention, the waste collection pocket is used. The upper wall (blocking lid) of the pocket (6) may be configured separately from the blocking lid (15) of the hot water storage wall (1).

  The lower edge of the opening (61) is constituted by a dam plate (62). The upper end position of the dam plate (62) is set at a position slightly higher than the liquid level (L1) of the molten aluminum (L) stored in the hot water storage tank (1). The residue (Lx) floating on the liquid level of (L) overflows the dam plate (62) and flows into the residue collection pocket (6).

  In the present embodiment, a portion corresponding to the waste collection pocket (6) on the peripheral side wall of the hot water tank (1) is cut out to form an opening (61), and the lower edge of the opening (61) You may make it comprise a dam board (62) by a part.

  Further, in the present embodiment, as shown in FIGS. 7 and 8, a sunk inflow recess (63) such as a V-shape or a U-shape (upward U-shape) is formed on the top of the dam plate (62). Then, the residue (Lx) may overflow from the hot water storage tank (1) through the recess (63). Thus, when forming a recessed part (63) in a dam board (62), the position of the bottom face of a recessed part (63) is set rather than the liquid level (L1) of the molten aluminum (L) in a hot water storage tank (1). It may be formed at a slightly higher position.

  The waste collecting pocket (6) is provided with an openable / closable blocking plate (65). By closing the blocking plate (65), as shown in FIG. The hot water tank (1) is separated into an inlet chamber (66) and an outer outlet chamber (67). Further, when the blocking plate (65) is closed, the blocking chamber (65) seals the inlet chamber (66) with respect to the outlet chamber (67).

  A waste discharge pipe (68) is provided on the peripheral wall of the waste recovery pocket (6) on the outlet chamber (67) side, and an open / close valve (69) is provided on the pipe (68). Then, when the opening / closing valve (69) is opened, circulation in the waste discharge pipe (68) is allowed, and the waste (Lx) accommodated in the outlet chamber (67) of the waste recovery pocket (6) is transferred to the waste discharge pipe (68). ) To be discharged to the outside. When the on-off valve (69) is further closed, the flow of the waste discharge pipe (68) is interrupted, and the discharge of the waste (Lx) is stopped. Needless to say, when the on-off valve (69) is closed, the inside of the waste collection pocket (6) is blocked from the outside air to ensure airtightness.

  Here, in the present embodiment, a gas discharge means is constituted by the blocking plate (65), the gas discharge pipe (68), the open / close valve (69) and the like.

  As shown in FIGS. 1, 2, and 5, current plates (71) to (73) extending in the vertical direction are provided on the inner surfaces of the front side wall, the one side wall (right side wall), and the rear side wall of the hot water tank (1). It has been.

  Each of the current plates (71) to (73) is attached so as to protrude inward from the inner wall surface of the hot water storage tank (1), and the flow of the molten aluminum (L) that rotates counterclockwise in a plan view. Arranged at right angles to the direction. Furthermore, the lower ends of the current plates (71) to (73) are arranged so as to contact the bottom surface of the hot water storage tank (1). Therefore, a part of the molten aluminum (L) that is rotationally flowed is guided (flowed) upward by the current plates (71) to (73).

  Each of the current plates (71) to (73) has an upper end equal to or lower than the lower end position of the cylindrical seal member (3) and the hot water inlet (45), and the position of the processing gas discharge member (21). It is arranged at a higher position.

  In addition, on the front side of the residue collection pocket (6) on the inner surface of the other side wall (left side wall) of the hot water storage tank (1), in other words, the molten aluminum (L) with respect to the opening (61) of the collection pocket (6). At the position downstream in the rotational flow direction, a detent plate (75) is attached so as to protrude toward the inside of the tank. The upper end portion of the residue plate (75) is disposed above the liquid surface (L1) of the molten aluminum (L), and is disposed perpendicular to the rotational flow direction of the molten aluminum (L). . Accordingly, the gas receiving plate (75) receives the waste (Lx) floating on the liquid surface and rotating counterclockwise following the molten aluminum (L), toward the waste recovery pocket (6). It can be guided.

  Here, in the present embodiment, the vicinity of the residue collection pocket opening behind the residue stopper plate in the hot water storage tank (1), that is, the corner (one corner) between the rear side wall and the left side wall is the residue pool portion (60). It is configured.

  Further, as shown in FIG. 2, the side edge portion of the debris stop plate (75) is bent rearward and is configured as a debris guiding portion (76), which rotates and flows on the liquid surface, The residue (Lx) that hits (75) is guided by the residue guiding portion (76) and smoothly guided to the residue reservoir (60) side.

  In the present embodiment, the lower end of the residue stopper plate (75) is disposed so as to contact the bottom surface of the hot water storage tank (1), and the lower portion (74) of the residue stopper plate (75) 71) to (73). Therefore, in this embodiment, you may make it handle the lower part (74) of the debris stop plate (75) as a current plate similar to the current plates (71) to (73).

  In the present embodiment, the lower end of the residue plate (75) is provided up to the bottom surface of the hot water tank (1). However, the present invention is not limited to this, and in the present invention, the lower end of the gas receiver plate (75) is made of aluminum. You may make it provide only to the shallow position (surface layer part) of a molten metal (L). In this case, a current plate may be separately provided below the gas receiving plate and separated from the gas receiving plate.

  As shown in FIG. 6, the molten aluminum treatment apparatus of the present embodiment is provided with an exhaust gas recovery facility (8) as exhaust gas recovery means. The exhaust gas recovery facility (8) includes a gas recovery pipe (80) constituted by a group of pipes, and the inflow side end of the gas recovery pipe (80) has a closed lid ( 15) is penetrated in a sealed state, and is arranged above the liquid level (L1) of the molten aluminum (L) in the hot water tank (1) (above the molten liquid level).

  Further, the exhaust gas recovery facility (8) includes a steam trap (81) for trapping steam of aluminum (Al), magnesium (Mg) and zinc (Zn), a pressure gauge (82), and a compressor ( 83) and a gas recovery container (84), which are provided in this order on these gas recovery lines (80).

  The used gas (exhaust gas) that fills the molten metal surface in the hot water tank (1) is sucked into the gas recovery line (80) by driving the compressor (83), and the exhaust gas is converted into a steam trap. Al, Mg, Zn vapor is removed through (81) and is recovered in the gas recovery container (84).

  The recovered gas is appropriately purified at a refinery to a processing gas having a predetermined component, such as argon gas having a predetermined purity, and recycled.

  Needless to say, the gas transport means that can be employed in the exhaust gas recovery facility (8) is not limited to the compressor (83), and other gas transport means, such as a suction pump, can be employed (the gas recycling described later). The same applies to facility 9).

  Here, in this embodiment, the tank internal pressure adjusting means is constituted by gas transport means such as the compressor (83).

  Next, the operation at the time of processing the molten aluminum (L) by the molten metal treatment apparatus of the present embodiment and removing waste (Lx) such as non-metallic inclusions and impurities from the molten metal (L) will be described.

  First, when the molten metal processing apparatus is in operation, a predetermined amount of molten aluminum (L) is stored in advance in the hot water storage tank (1).

  As described above, the lower end of the cylindrical seal member (3) disposed on the outer periphery of the processing gas blowing shaft (2), the hot water inlet (41) and the hot water outlet pipe (5) of the hot water pipe (4). ) Is provided at a position below the liquid level (L1) of the molten aluminum (L) to be stored. Further, in the waste collection pocket (6), the shut-off plate (65) is opened and the open / close valve (69) is closed. Therefore, in this state, the upper space in each of the hot water storage tank (1) and the waste collection pocket (6) is liquid-sealed so that the cylindrical seal member (3), the hot water pipe (4), and the hot water pipe It is sealed with respect to each inside of (5) and is in a state of being blocked from the atmosphere (outside air).

  In this state, the molten aluminum (L) is continuously passed through the hot water inlet (41) from the hot water inlet (41) into the hot water tank (1) and the molten aluminum in the hot water tank (1). (L) is sequentially and continuously discharged from the hot water outlet (51) to the hot water discharge pipe (5), and is sent through the pipe (5) to a predetermined location (casting equipment hot water). The detailed flow operation of the molten aluminum (L) in the hot water tank (1) will be described later.

  Thus, while supplying the molten aluminum (L) into the hot water tank (1), the processing gas supply means ((2) and the processing gas discharge member (21) are driven to rotate about the axis while rotating the processing gas. 20) Argon gas (processing gas) is supplied in a pressurized state into the shaft (2). Argon gas supplied into the shaft (2) descends in the shaft (2) and is introduced into the processing gas discharge member (21) to form countless bubbles from the outer peripheral surface of the processing gas discharge member (21). And evenly dispersed in the molten aluminum (L).

  Innumerable bubbles released into the molten aluminum (L) float on the molten metal surface (L1) by adhering debris (Lx) mixed in the molten metal when floating inside the molten metal, While being separated from the residue (Lx) and released to the sky, the separated residue (Lx) floats on the molten metal surface. In this way, the residue (Lx) mixed in the molten aluminum (L) rises and floats on the liquid surface.

  Here, in the present embodiment, the molten aluminum (L) in the hot water tank (1) is caused to rotate counterclockwise in plan view as indicated by the black arrow in FIG. 2 due to the rotation of the shaft (2). The molten aluminum (L) is flowing along the rotating flow. On the other hand, the hot water inlet (41) of the hot water inlet pipe (4) is disposed downward on the surface layer near the liquid surface, and the hot water outlet (51) of the hot water outlet pipe (5) is connected to the hot water tank (1). It is arranged downward in the deep part near the bottom of the. For this reason, the mainstream molten aluminum (L) flowing in from the hot water inlet (41) flows along the spiral flow so as to gradually settle while swirling in the hot water tank (1). After that, it flows out from the hot water outlet (51) to the hot water outlet pipe (5) and flows out of the hot water storage tank (1). Since the molten aluminum (L) supplied into the hot water tank (1) in this way flows uniformly throughout the hot water tank (1) along the spiral flow, a large number of argon gas bubbles and By contacting, as described above, the residue (Lx) mixed in the molten aluminum (L) is surely removed.

  Furthermore, in this embodiment, since the hot water inlet (41) of the hot water pipeline (4) is arranged on the surface layer near the liquid surface, the aluminum that has flowed into the hot water tank (1) from the hot water inlet (41). The molten metal (L) can be smoothly joined to the rotating flow at the surface layer portion.

  Furthermore, since the hot water outlet (51) of the hot water outlet pipe (5) is disposed in the deep layer near the bottom surface, the molten aluminum (L) that has settled along the spiral flow in the hot water tank (1). Can be smoothly discharged from the hot water storage tank (1) through the hot water outlet (51).

  As described above, the molten aluminum (L) flowing in from the hot water inlet (41) can be merged into a predetermined rotational flow without difficulty, and the rotationally flowing aluminum molten metal (L) can be smoothly fed into the hot water outlet (51). Therefore, it is possible to reliably obtain the optimum flow characteristics for the above debris removal.

  Further, in the middle layer portion and the deep layer portion below the surface layer portion of the molten aluminum (L), the cylindrical sealing member (3) is not disposed, so that the rotational force by the shaft (2) is directly transmitted to the molten metal (L). The fluid flows so as to be pushed outward while rotating with a sufficient rotational force. While sufficient rotational flow is generated in the middle layer portion and the deep layer portion in this way, on the lower side portion (deep layer portion) on the inner peripheral wall surface of the hot water tank (1), the rectifying plates (71) to (71) to ( 73) is arranged, the flow of some molten aluminum (L) rotating and flowing in the deep layer is controlled by the rectifying plates (71) to (73) as shown by the black arrows in FIG. And rises along the inner wall surface of the tank. By this upward flow, the rotating flow in the intermediate layer and the deep layer is pushed up to the surface layer, and a desired stable rotating flow is generated in the surface layer, and the molten aluminum (L) is large and slowly as described above. Rotating fluid.

  Moreover, in this embodiment, since the circumference | surroundings of the shaft (2) are covered with the cylindrical seal member (3) in the surface layer part of the molten aluminum (L), the molten aluminum (L) that rotates and flows in the surface layer part is It is possible to prevent problems such as entanglement with (2) and abrupt sedimentation, and a desired large and gentle rotating flow can be reliably generated at the surface layer portion.

  Furthermore, the aluminum melt (L) that rotates and flows so as to swivel around the cylindrical seal member (3) and a part of the aluminum melt (L) that circulates and flows up and down are mixed in a well-balanced manner. It is possible to prevent such a problem that a part of the molten aluminum (L) stays at a specific location of the hot water tank (1) for a long period of time, and it is possible to reliably remove the residue.

  In addition, the molten aluminum (L) in the surface layer does not directly entangle with the shaft (2), and a large, slow, and stable rotating flow is generated. As described later, the residue (Lx) can be easily recovered. it can.

  In this embodiment, since the periphery of the shaft (2) is covered with the cylindrical seal member (3) in the surface layer portion of the molten aluminum (L) in the hot water tank (1), the shaft (2) Rotational flow due to rotation is difficult to occur. Further, in the deep layer portion of the molten aluminum (L), since the rectifying plates (71) to (73) are arranged, the rotational flow is suppressed. Therefore, in this embodiment, since the upper end positions of the rectifying plates (71) to (73) are disposed lower than the lower end position of the cylindrical seal member (3) as described above, at least the rectifying plate ( In the middle layer portion between 71) to (73) and the cylindrical seal member (3), a desired rotational flow is obtained in the molten aluminum (L). Therefore, as described above, a stable rotational flow can be reliably obtained in the molten aluminum (L) even in the surface layer portion.

  On the other hand, in the molten metal treatment apparatus of this embodiment, since the molten metal surface of the hot water storage tank (1) is sealed as described above, the used argon released into the molten metal and discharged onto the liquid surface. Gas (exhaust gas) is sealed in the hot water storage tank (1) in a pressurized state, and can be surely prevented from being inadvertently released into the atmosphere. Moreover, since the molten aluminum (L) in the hot water storage tank (1) is processed in a state where it is shut off from the outside air, it is possible to further improve the debris removal performance, and a high-quality molten aluminum (casting material) can be obtained. You can definitely get it.

  Here, in the present embodiment, the used argon gas sealed in the hot water tank (1) is recovered. That is, as shown in FIG. 6, when recovering the processing gas, the compressor (83) in the exhaust gas recovery facility (8) is driven, and the used gas filling the liquid level of the hot water tank (1) is recovered. By suctioning and flowing along the pipe line (80), the gas is recovered into the gas recovery container (84) via the steam trap (81).

  Further, as described above, the recovered argon gas is purified to a predetermined purity argon gas (a processing gas having a predetermined component) and recycled in the refinery.

  The used argon gas recovery process may be performed intermittently by batch processing or continuously by in-line processing.

  Moreover, in this embodiment, the residue (Lx) which floats on the molten metal surface in the hot water storage tank (1) can be collected and discharged.

  That is, as described above, since the molten aluminum (L) in the surface layer portion is largely and slowly rotated, the residue (Lx) floating on the liquid surface (L1) is entangled with the shaft (2) and aggregated in the center portion. There is no, and while moving largely on the liquid surface following the rotational flow of the molten aluminum (L), it gradually moves outward by centrifugal force. Since the behavior of the residue (Lx) can be controlled so that the residue (Lx) is guided to the outer peripheral portion of the hot water tank (1) in this way, the residue (Lx) can be easily collected.

  Specifically, since the residue pool portion (60) is formed at the corner between the left side wall and the rear side wall of the molten metal treatment layer (1), the inner peripheral wall surface of the molten metal treatment layer (1), that is, the inner surface of the rear side wall The dregs (Lx) moving along the hose are smoothly guided to the dregs reservoir (60). In addition, in the present embodiment, since the debris stop plate (75) is disposed downstream of the rotational flow in the debris reservoir (60) in a manner that blocks the rotational flow, the debris reservoir ( The residue (Lx) about to cross (60) is received by the residue stopper plate (75) and guided to the residue reservoir (60). Therefore, the residue (Lx) floating on the liquid surface is efficiently collected in the residue storage part (60).

  Here, in the molten metal processing apparatus of the present embodiment, in a normal operation state, for example, in a state where the used argon gas is not sucked and collected, the space above the molten metal surface of the hot water tank (1) is sealed and in a pressurized state. The supplied argon gas (exhaust gas) is full. Therefore, as shown in FIGS. 1 and 3A, the atmospheric pressure (tank pressure P2) above the hot water storage tank (1) is higher than the external atmospheric pressure (P1). Therefore, the relationship of “atmospheric pressure (P1) <tank internal pressure (P2)” is established, and the liquid level of the hot water storage tank (1) is lower than the liquid level in the atmospheric pressure state.

  And in this embodiment, since the upper end position of the dam board (62) in the dregs recovery pocket (6) is set to a position higher than the liquid level (L1) of the hot water tank (1) as described above. In the normal operation state, the waste (Lx) collected in the waste reservoir (60) in the hot water tank (1) is collected in the waste reservoir (60) without overflowing the dam plate (62). It stays at.

  Therefore, in the present embodiment, the accumulated residue (Lx) is collected from the hot water storage tank (1) at a residue collection pocket periodically or when a predetermined amount or more of residue (Lx) is accumulated in the residue reservoir (60). Collected in (6).

  That is, in order to perform the waste recovery operation, the compressor (83) of the exhaust gas recovery facility is driven, or the hot water storage tank (1) is simply opened to the outside air, so that the atmospheric pressure (P2) in the hot water storage tank (1) is reached. ). As a result, as shown in FIG. 3B, the melt liquid level (L1) in the hot water tank (1) rises, and as the liquid level rises, the residue (Lx) on the liquid level also rises. Accordingly, the waste (Lx) is arranged higher than the upper end of the dam plate (62) of the waste collection pocket (6), and the waste (Lx) overflows the dam plate (62), and the waste collection pocket (6 ).

  In this way, when the waste (Lx) in the hot water storage tank (1) is recovered in the waste recovery pocket (6) and then restarted, the drive of the compressor (83) is stopped or the hot water storage tank (1) The inside is cut off from outside air.

  In the present embodiment, the waste (Lx) recovered in the waste recovery pocket (6) can be discharged to the outside. For example, during normal operation, the waste (Lx) in the waste recovery pocket (6). 3C, as shown in FIG. 3C, by closing the blocking plate (65) of the waste collection pocket (6), the inlet chamber (66) and the outlet chamber (67) are separated, and the outlet chamber ( 67) is cut off from the atmosphere in the hot water tank (1). Thereafter, the open / close valve (69) is opened, and the residue (Lx) in the outlet chamber (67) is discharged to the outside through the residue discharge pipe (68).

  When the hot water tank (1) is opened to the atmosphere and the waste (Lx) is collected in the waste collection pocket (6), the shut-off plate (65) is not closed while the atmosphere is open. The waste (Lx) collected in the waste collection pocket (6) may be discharged to the outside through the waste discharge pipe (68) while being left open.

  Further, when the hot water storage tank (1) is opened to the atmosphere during periodic inspection, the waste discharge pipe (68) is connected to the waste (Lx) in the waste recovery pocket (6) without closing the blocking plate (65). It can also be discharged through. In other words, in the present invention, the blocking plate (65) is not necessarily provided, and in the case where the inside of the hot water storage tank (1) is opened to the atmosphere, if necessary, the waste collecting pocket (6) Waste (Lx) may be discharged.

  Moreover, in this embodiment, since the in-bath drawing-in part of the tapping pipe line (5) is disposed in the dead space between the front wall of the hot water storage tank (1) and the detent plate (75), the tank Internally installed parts can be arranged efficiently in terms of space, a wasteful enlargement of the hot water tank (1) can be avoided, and high performance and compactness can be achieved.

  Needless to say, the installation positions of the hot water supply pipe (4) and the hot water discharge pipe (5) are not limited to those in the above embodiment, and may be installed at any position. For example, as shown in FIG. 9, a hot water outlet pipe (5) may be installed at the front end of the right side wall of the hot water tank (1). Furthermore, as shown in FIG. 10, the hot water pipe (4) may be installed at the right end of the front side wall of the hot water tank (1).

  Moreover, in the said embodiment, although the tank drawing-in part of the hot water supply pipe line (4) is formed in linear form, it is not restricted to it, In this invention, the in-bath drawing-in part of the hot water supply pipe line (4) is bent. You may make it let it. For example, as shown in FIG. 11, a downward extending portion (42) extending downward is formed in the in-vessel retracting portion of the hot water pipe (4), and a hot water inlet (41) opening downward is formed at the lower end thereof. You may make it form. Further, as shown in FIG. 12, a downward extending portion (42) extending downward is formed in the tank drawing-in portion of the hot water pipe (4), and the lower end of the downward extending portion (42) is connected to the control plate. While closing by (43), you may make it form the hot water inlet (41) opened to a horizontal direction (lateral direction) in the lower surrounding wall of a downward extension part (42). Thus, when opening the hot water inlet (41) sideways, the outflow direction of the molten metal (L) flowing out from the hot water inlet (41) is determined as the rotational flow direction of the molten metal (L) in the hot water storage tank (1). Therefore, the rotational speed can be accelerated, and a more stable rotational flow can be generated in the molten metal surface layer.

  Furthermore, in the said embodiment etc., although the opening direction of the hot water inlet (41) is set to downward or a horizontal direction, it is not restricted only to it, In the present invention, the hot water inlet is opened diagonally downward or diagonally upward. Anyway.

  Similarly, the opening direction of the hot water outlet (51) is not limited to the downward direction, and may be set to be obliquely downward or obliquely upward as well as laterally.

  Moreover, in this invention, as shown in FIG. 13, you may make it form an inflow hole (31) in the cylindrical seal member (3) provided around a shaft (2). The inflow hole (31) is provided lower than the melt liquid level (L1), and the molten aluminum (L) is caused to flow into the cylindrical seal member (3) through the flow hole (31). The molten aluminum (L) is allowed to settle and flow outward while rotating from the middle layer to the deep layer. In this case, a more stable rotating flow can be generated in the middle layer portion and deep layer portion of the molten aluminum (L), and a more stable rotating flow can be reliably generated in the surface layer portion.

  Further, when the inflow hole (31) is formed in the cylindrical seal member (3), as shown in FIG. 14, it is lower than the inflow hole (31) on the inner peripheral surface of the cylindrical seal member (3). On the side, the flow of the molten metal (L) descending in a spiral manner inside the cylindrical seal member (3) by providing the inner peripheral linear strip portion (32) such as a convex strip portion or a concave strip portion in a spiral manner. And the molten metal (L) can be more smoothly settled. In addition, the flow of the molten metal (L) descend | falls helically can be generated also by providing a linear filament part, such as a helical protrusion part or a concave part, in the outer peripheral surface of a shaft (2). .

  Moreover, in this invention, as shown in FIG. 15, you may make it provide a blade | wing (25) in the outer peripheral surface of a shaft (2). In this case, a sufficient rotational force can be applied to the molten aluminum (L) by the blades (25), and a stable rotational flow can be generated more reliably.

  Moreover, in the said embodiment, the height of a molten-metal liquid level (L1) is raised by changing the atmospheric pressure in a hot water storage tank (1), and the residue (Lx) on a liquid level is made into a dam plate (62). On the other hand, it is made to overflow and collect in the waste collection pocket (6), but it is not limited thereto, and in the present invention, the dam plate (62) is provided so as to be driven up and down freely, The dam plate (62) is lowered, and the waste (Lx) on the hot water storage tank (1) side is overflowed with respect to the lower dam plate (62) and recovered in the waste collection box (6). good.

  Further, in the above-described embodiment, every time a predetermined amount of waste (Lx) in the hot water storage tank (1) is stored, the waste (Lx) is intermittently recovered from the hot water storage tank (1) to the waste recovery box (6). However, the present invention is not limited to this, and in the present invention, the residue (Lx) may be continuously recovered from the hot water storage tank (1) to the residue recovery box (6). That is, the upper end position of the dam plate (62) is set to the same level as the molten metal level (L1) of the hot water storage tank (1) or slightly higher, and the waste reservoir (60) of the hot water storage tank (1). In addition, as the scum (Lx) is sequentially collected, the dam plate (62) is automatically and continuously overflowed to be recovered in the scum recovery box (6). May be collected in the waste collection box (6).

  Further, in the present invention, the waste collection box (6) is not necessarily required, and the waste storage portion (60) is used as necessary in anticipation of opening the closing lid (15) of the hot water storage tank (1). The scraps (Lx) collected in (1) may be appropriately scooped with a ladle or the like.

  By the way, in the said embodiment, although collect | recovered used argon gas is refine | purified and reused by a batch type, it is not restricted to it, In this invention, the collect | recovered used argon gas is used. It may be refined sequentially in-line and reused in real time.

  For example, as shown in FIG. 16, you may make it equip the molten metal processing apparatus similar to the said embodiment with gas reuse equipment (9). This gas reuse facility (9) includes a gas pipe (90) constituted by a pipe group, and an inflow side end of the gas pipe (90) is a closed lid (15) of the hot water tank (1). And is disposed above the molten liquid level (L1) in the hot water storage tank (1).

  Further, the gas recycling facility (9) includes a steam trap (81), a water removal device (91), an oxygen removal device (92), a carbon oxide removal device (93), a hydrogen removal device on the gas pipe (90). A device (94), a pressure gauge (82), a compressor (83) and a gas storage container (95) are provided. Further, a return pipe (96) constituted by a pipe group is connected to the gas outlet of the gas storage container (95), and the return pipe (96) is connected via a pressure gauge (97). The upper end of the shaft (2) is connected in communication. Further, processing gas supply means (20) such as an argon gas cylinder is connected to the return pipe (96) for backup.

  In this gas recycling facility (9), when the compressor (83) is driven, the used gas filling the sky in the hot water tank (1) is sucked into the gas pipe (90), and the used gas is Through the steam trap (81), the moisture removing device (91), the oxygen removing device (92), the carbon oxide removing device (93), and the hydrogen removing device (94), AL, Mg, Zn vapor, moisture, oxygen, oxidation Carbon and hydrogen are sequentially removed and purified to an argon gas having a predetermined purity (a processing gas having a predetermined component), and then stored in a gas storage container (95). Further, the purified gas stored in the gas storage container (95) is supplied to the shaft (2) through the return pipe (96), and finely refined in the molten aluminum (L) in the hot water storage tank (1). It is released in a bubble state. When the supply amount (gas pressure) of the purified gas from the gas storage container (95) to the hot water storage tank (1) is small, the insufficient processing gas is returned from the backup processing gas supply means (20). It is supplied to the pipe line (96).

  Thus, in the present invention, the collected used gas can be reused (recycled) in real time.

  Here, in this embodiment, a gas purification means is constituted by the steam trap (81), the moisture removing device (91), the oxygen removing device (92), the carbon oxide removing device (93), and the hydrogen removing device (94). ing.

  The molten aluminum treatment apparatus of the present invention can be applied to a gas bubbling filter or the like in which a treatment gas is blown into the molten aluminum.

DESCRIPTION OF SYMBOLS 1 ... Hot water storage tank 11 ... Hot water storage tank main body 15 ... Closure lid 16 ... Shaft insertion hole 2 ... Processing gas blowing shaft 21 ... Processing gas discharge member 25 ... Blade 3 ... Cylindrical seal member 31 ... Inflow hole 32 ... Inner peripheral line Part 4 ... Hot water pipeline 45 ... Hot water inlet 5 ... Hot water outlet 55 ... Hot water outlet 6 ... Waste collection pocket (cass collection part)
61 ... opening 62 ... dam plates 71-73 ... rectifying plate 75 ... debris stop plate 83 ... compressor (tank pressure adjusting means)
L ... Molten aluminum L1 ... Molten liquid level Lx ... Waste

Claims (13)

A sealed hot water tank in which molten aluminum is stored;
A cylindrical seal member penetrating in a sealed state in the upper wall of the hot water storage tank;
A processing gas blowing shaft that is disposed through the cylindrical seal member and from which a processing gas is released in a bubble state into the molten metal from a lower end disposed below the molten liquid surface,
A hot water inlet is provided in a tank drawing-in part which is penetrated in a sealed state in the peripheral wall of the hot water tank and is disposed inside the hot water tank, and the molten aluminum supplied from the outside of the tank is used as the hot water inlet. A hot water inlet pipe that flows into the hot water storage tank through
A hot water outlet is provided in a tank lead-in portion that is a portion that is hermetically sealed in the peripheral wall of the hot water tank and is disposed inside the hot water tank, and the molten aluminum in the hot water tank is connected to the hot water outlet. And a hot water outlet pipe that flows out of the tank through
The lower end of the cylindrical seal member, the hot water inlet and the hot water outlet are disposed below the molten liquid surface,
In the hot water storage tank, the molten metal liquid surface is sealed with aluminum molten metal from the inside of each of the cylindrical seal member, the hot water inlet pipe and the hot water outlet pipe,
A tank internal pressure adjusting means for adjusting the air pressure above the melt liquid level in the hot water storage tank is provided, and the height of the melt liquid level is controlled by adjusting the atmospheric pressure by the tank internal pressure adjusting means. Aluminum melt treatment equipment.   The molten aluminum treatment apparatus according to claim 1, wherein the molten aluminum treatment apparatus is configured to be able to collect exhaust gas that fills the molten metal surface in the hot water tank.   3. The molten aluminum treatment apparatus according to claim 1, wherein the hot water storage tank has a hot water storage tank body having an opening at an upper end, and a closing lid for closing the upper end opening of the hot water storage tank body.   The molten aluminum processing apparatus according to any one of claims 1 to 3, wherein the hot water inlet is disposed higher than the hot water outlet. The shaft is configured to be rotatable around an axis,
The molten aluminum processing apparatus according to any one of claims 1 to 4, wherein a rotational flow is generated in the molten metal in the storage tank by the rotation of the shaft.   The molten aluminum processing apparatus according to claim 5, wherein a waste pool portion for collecting waste is provided on an inner surface of the peripheral wall of the hot water storage tank.   The molten aluminum processing apparatus according to claim 6, wherein the hot water storage tank is formed in a rectangular shape in plan view, and one corner portion of the hot water storage tank is configured as the waste pool part.   The molten aluminum treatment apparatus according to claim 6 or 7, wherein a debris retaining plate is provided on an inner wall surface of the hot water storage tank for receiving debris floating on the molten liquid surface and collecting it in the debris reservoir. The peripheral wall of the hot water tank is provided with an opening corresponding to the waste pool part,
Outside the hot water storage tank, a sealed-type dregs recovery unit communicating with the dregs reservoir through the opening is provided,
The molten aluminum processing apparatus according to any one of claims 6 to 8, wherein the waste collected in the waste pool part is recovered by the waste recovery part through the opening. A dam plate is provided at the lower edge of the opening,
The molten aluminum processing apparatus according to claim 9, wherein the waste collected in the waste pool portion overflows the dam plate and is recovered by the waste recovery portion.   The molten aluminum treatment apparatus according to claim 10, wherein when the waste is recovered by the waste recovery part, the molten metal level is raised by the tank internal pressure adjusting means.   The aluminum according to any one of claims 9 to 11, wherein a waste discharging means for discharging the waste recovered by the waste recovery part to the outside in a state where an atmosphere is shut off from the inside of the hot water storage tank. Molten metal processing equipment.   The molten aluminum treatment apparatus according to claim 2, wherein the collected exhaust gas is purified and reused as a treatment gas.

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