JPH0623555Y2 - Molten metal cleaning equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention relates to a cleaning device for removing impurities such as dissolved gas and non-metallic inclusions contained in molten metal such as molten aluminum or aluminum alloy. .

Conventional technology Generally, the molten metal before casting contains impurities such as dissolved gas and non-metallic inclusions.The molten metal containing a large amount of these impurities is cast as it is and further rolled, extruded, etc. If the product is manufactured through the steps, defects due to impurities frequently occur and the quality of the product is impaired. Therefore, it is desirable to remove impurities in the molten metal as much as possible before casting. For example, in the case of molten aluminum or aluminum alloy, it is usual that a dissolved gas typified by hydrogen gas, an oxide such as aluminum or magnesium, or a nonmetallic inclusion such as refractory particles is contained,
To obtain high quality products, it is necessary to remove these impurities before casting.

Conventionally, as a method for removing the dissolved gas and non-metallic inclusions in the molten aluminum or aluminum alloy as described above, an inert gas such as nitrogen or argon in the molten metal or a gas obtained by mixing chlorine gas with this (generally, This is referred to as fluxing gas), and the dissolved gas in the molten metal is released into the bubbles of the fluxing gas and non-metallic inclusions are adsorbed, and separated and removed from the molten metal by floating gas bubbles. Such a gas blowing method is known. On the other hand, there is also known a pasting method in which a molten aluminum or aluminum alloy is passed through a filter and non-metallic inclusions contained in the molten metal are excessively removed.

The former gas blowing method is particularly effective for removing dissolved gas, while the latter over method is particularly effective for removing non-metallic inclusions. Therefore, recently, in order to take advantage of the advantages of both, a cleaning device that uses both of them is disclosed in, for example, Japanese Patent Laid-Open No.
It is proposed in Japanese Patent Laid-Open No. 1025 or Japanese Patent Laid-Open No. 54-106005. In these cleaning devices, first, a molten metal such as an aluminum alloy is introduced into a gas processing chamber and cleaned by blowing a fluxing gas,
Further, it is constructed so as to guide the molten metal to an excess chamber and clean it by passing it. Therefore, impurities such as dissolved gas and non-metallic inclusions in the molten metal are surely and sufficiently removed to obtain a high quality molten metal. be able to.

Problems to be Solved by the Invention In the conventional cleaning device using both blowing and excess of the fluxing gas, it is possible to obtain high quality molten metal with few impurities such as dissolved gas and non-metallic inclusions. However, in actual operation, high quality molten metal is not always required so that both the blowing of the fluxing gas and the excess of the fluxing gas are required to be used together. It is often the case that blowing only a xing gas is sufficient, or that it is sufficient to remove mainly non-metallic inclusions. However, in the conventional cleaning device that uses both the blowing gas and the excess gas, once it is installed, the molten metal is used both in the gas processing chamber for blowing the fluxing gas and in the excess chamber for the excess gas. I have to pass. Therefore, there is a problem that the running cost increases because both the gas processing chamber and the excess chamber have to be passed even when the cleaning by blowing the fluxing gas is sufficient or the excess is sufficient. That is, even if the fluxing gas is not blown in the gas processing chamber, the molten metal in the gas processing chamber must be heated with an immersion heater or the like in order to avoid the temperature decrease of the molten metal as long as the molten metal is flown into the gas processing chamber. On the other hand, even if the excess chamber is not overheated (no filter is provided), the molten metal in the excess chamber must be heated by an immersion heater or the like in order to avoid a temperature drop as long as the molten metal is poured into the excess chamber. Also in this case, the cost for heating the molten metal was required to be the same as that for performing both the gas injection and the gas injection.

The present invention has been made in view of the above circumstances. Even in a cleaning device having both a gas processing chamber and a chamber for blowing fluxing gas, either of them may be used depending on the required quality. It is an object of the present invention to provide a device that can use only one of them, that is, can selectively use a gas treatment chamber and an excess chamber, and thereby can minimize the running cost depending on the required quality. It is what

Means for Solving the Problems The present invention discloses that a gas treatment chamber for cleaning a molten metal by blowing a fluxing gas into the molten metal and an excess chamber for allowing the molten metal to pass through a filter are adjacently integrated. In the apparatus for cleaning molten metal thus obtained, an inlet-side flow path is formed between the inlet for introducing untreated molten metal from the outside and the inlet of the gas processing chamber, and the inlet of the gas processing chamber and the outlet are provided. An intermediate channel is formed between the chamber and the chamber, and a first outlet channel is formed between the discharge port for discharging the treated molten metal to the outside and the outlet of the excess chamber. A second outlet side channel is also formed between the outlet and the outlet of the gas processing chamber, and the second outlet side channel is detachably disposed in the intermediate channel and the first and second outlet side channels. Between the weir for closing these flow paths and the inlet side flow path and the intermediate flow path It is equipped with an auxiliary gutter that is detachably hung from the inlet to directly connect these flow passages. By attaching and detaching these weirs and auxiliary gutters, the molten metal can reach from the inlet to the outlet. It is characterized in that the gas processing chamber can be switched between three states, that is, a state of passing both the gas processing chamber and the excess chamber, a state of passing only the gas processing chamber, and a state of passing only the excess chamber. .

Function When cleaning the molten metal using the cleaning device of the present invention, when both cleaning by blowing the fluxing gas and cleaning by excess are performed, a weir is provided in the second outlet side flow path. Place and close the second outlet channel. The weirs of the intermediate flow path and the first outlet flow path are removed, and the auxiliary gutter is also removed. By doing so, the molten metal to be treated flows into the gas treatment chamber from the inlet through the inlet side flow passage, and after cleaning by the fluxing gas blowing in the gas treatment chamber, the intermediate flow. It flows into the excess chamber through the passage, passes through the passage, and then reaches the discharge port through the first outlet-side flow passage. In this state, it goes without saying that the heaters for heating the molten metal are operated in both the gas processing chamber and the excess chamber.

On the other hand, when the molten metal can be cleaned only by blowing the fluxing gas, weirs are arranged in the intermediate flow passage and the first outlet flow passage to close these flow passages. The weir of the second outlet side channel is removed, and the auxiliary gutter is also removed. In this case, the molten metal to be processed flows into the gas processing chamber from the inlet through the inlet side flow path, is cleaned by blowing the fluxing gas in the gas processing chamber, and then is discharged from the outlet to the second outlet. Immediately reaches the outlet via the side flow path. Therefore, in this case, since the molten metal does not flow into the excess chamber, it is not necessary to heat the excess chamber with the heater.

Furthermore, when cleaning the molten metal only by excessive
A weir is arranged in the second outlet side channel to close the channel, and an auxiliary gutter is laid between the inlet side channel and the intermediate channel.
The weirs of the intermediate channel and the first outlet channel are removed. In this case, the molten metal to be treated from the outside directly flows into the excess chamber from the inlet through the auxiliary gutter, passes through the excess chamber, and then reaches the outlet through the first outlet channel. Therefore, in this case, since the molten metal does not flow into the gas processing chamber, it is not necessary to use a heater in the gas processing chamber,
Of course, it is not necessary to inject gas.

Embodiment FIG. 1 to FIG. 4 show a cleaning device according to an embodiment of the present invention.

1 to 4, a gas treatment chamber 2 is formed on one side in the longitudinal direction of a tank body 1 having an oblong shape as a whole, and an over chamber 3 is formed on the other side. The processing chamber 2 and the excess chamber 3 can be opened and closed by upper lids 18 and 1, respectively.
Covered by 9. An inlet 5 for introducing untreated molten metal from the outside and an outlet 6 for discharging the treated molten metal are formed at the end of the tank body 1 on the gas processing chamber 2 side. The inlet 5 communicates with the inlet 2A of the gas processing chamber 2 through the inlet side flow path 7.

A gas blowing device 8 which will be described later is vertically inserted from above in a substantially central portion of the gas processing chamber 2, and a guide member 9 is provided immediately below the gas blowing device 8. Further, a floating slag separation chamber 10 is formed on the side of the gas processing chamber 2 (downward in FIG. 1). This floating slag separation room 10
Is formed at a position tangentially extending to the swirling flow of the molten metal generated by the rotation of the gas blowing device 8, and the partition wall 10 is vertically installed so as to diagonally cross the swirling flow.
It is designed to introduce a levitating skim by A.

A first outlet 2B is formed in an upper portion of the gas processing chamber 2 opposite to the inlet 2A.
The outlet 2B is communicated with the inlet 3A formed in the upper portion of the excess chamber 3 through the intermediate flow passage 11. Here, the intermediate flow passage 11 is defined so as to be located on an extension of the inlet-side flow passage 7. On the other hand, the first outlet 2 in the gas processing chamber 2
A barrier 12 is hung vertically at a corner symmetrical with respect to B. The barrier 12 partitions the corner of the gas processing chamber 2, and the lower end of the barrier 12 has a gas processing chamber 2 at the bottom.
A second outlet 2C that connects the inside of the container with the inside of the barrier 12 is formed. Then, the inner space of the barrier 12 merges with the first outlet-side channel 15 described later via the second outlet-side channel 13, and is communicated with the discharge port 6.

On the other hand, the excess chamber 3 has a filter 14 disposed therein, and an outlet 3B is formed in the lower portion of the wall of the excess chamber 3. The excess chamber outlet 3B is connected to the first outlet side flow path 15
And communicates with the outlet 6.

Two weirs 20A and 20B are detachably arranged in the intermediate flow passage 11 so that the intermediate flow passage 11 can be closed, and also in the first outlet side flow passage 15. The two weirs 21A and 21B are detachably arranged so as to be able to close the first outlet-side flow path 15, and the second weir
The weir 22 is also detachably arranged in the outlet side flow passage 13 so that the second outlet side flow passage 13 can be closed. An auxiliary gutter 23, for example, as shown in FIG. 5, is detachably provided between the inlet side flow path 7 and the intermediate flow path 11. The auxiliary gutter 23 shown in FIG. 5 has, for example, a refractory 25 lined in a steel skin 24 and is hung by a crane or the like so that an appropriate hook 2 can be easily hung.
6 is provided.

6 and 7 show an example of the gas blowing device 8 used in the gas processing chamber 2 in the cleaning device of the present invention, and FIG. 8 shows a guide member provided immediately below the gas blowing device 8. 9 shows an example.

In the gas blowing device 8 shown in FIGS. 6 and 7, the straight tubular body 30 is made of a refractory material, and the fluxing gas passage 31 is formed inside the tubular body 30. An impeller 32, which is also made of refractory, is fixed to the lower end of the tube body 30. This impeller 32
Is a peripheral wall portion 34 that communicates with the gas communication path 31 of the tubular body 30 and defines and forms a gas chamber 33 whose lower surface side is open;
A plurality of blade portions 35 radially protruding outside the peripheral wall portion 34 and a disk portion 36 that entirely covers the blade portion 35 at the upper end of the blade portion 35 are integrally formed. Here, the gas chamber 33 is formed such that the inner peripheral surface thereof, that is, the inner surface of the peripheral wall portion 34, is tapered downward at a predetermined angle θ. The fluxing gas blowing device 8 is supported by a rotary driving means such as a motor (not shown) so as to rotate at a high speed around the shaft, and is not shown in the gas passage 31 of the tubular body 30. A fluxing gas supply is connected.

Further, the guide member 9 shown in FIG.
Of the gas chamber 33 is constituted by a plurality of protrusions 37 which are formed so as to be curved in a predetermined direction with respect to the radial direction centered on the central axis position O of the gas chamber 33.

The situation when the cleaning apparatus of the above embodiment is used will be described below in accordance with FIG. 9 to FIG.

First, FIG. 9 shows a case where only the cleaning is performed by blowing a fluxing gas on the molten metal. In this case, two weirs 20A and 20B are provided in the intermediate flow passage 11.
To close the intermediate flow passage 11 and
The two weirs 21A and 21B are also arranged in the outlet side flow passage 15 to close the first outlet side flow passage 15. The second outlet side flow path 1
3 is open without arranging the weir 22, and the auxiliary gutter 23
Also remove. In this state, as shown by the arrow in FIG. 9, the molten metal to be treated is introduced from the inlet port 5 into the inlet side flow passage 7
The molten metal that has flowed into the gas treatment chamber 2 through the gas and is purified by blowing the fluxing gas into the gas treatment chamber 2 is discharged from the second outlet 2C to the second outlet passage 13 through the discharge port 6. It is discharged to the outside. The molten metal does not flow into the excess chamber 3. In this case, the molten metal in the gas processing chamber 2 is heated by an immersion heater or the like to prevent the temperature from lowering, but the excess chamber 3 does not need to be heated because the molten metal does not flow therein.

Here, the cleaning action by the blowing of the fluxing gas in the case of using the gas blowing device 8 and the guide member 9 as shown in FIGS. 6 to 8 will be explained. When a fluxing gas such as argon gas is supplied from a fluxing gas supply source (not shown) to the gas passage 31 of the pipe body 30 while rotating at high speed, the fluxing gas reaches the gas chamber 33 through the gas passage 31. The molten metal flows down along the tapered inner peripheral surface of the gas chamber 33 and is discharged into the molten metal from the lower end thereof, that is, the lower end of the peripheral wall portion 34. At the time of this discharge, the gas is diffused outward by the centrifugal force and rises by the buoyancy, and is divided by the high speed rotation of the blade portion 35 outside the peripheral wall portion 34 to become fine bubbles. Most of the fine bubbles are scattered in the outer peripheral direction of the blade portion 35, but a part thereof is struck by the guide member 9 immediately below the gas chamber, and the protrusion 37 thereof is formed.
Is further divided into finer parts by means of, and is guided by the grooves between the protrusions 37 and diffused outward. Then, while these fine bubbles rise in the molten metal due to buoyancy, dissolved gas such as hydrogen gas in the molten metal is released into the bubbles, and non-metallic inclusions such as oxides of aluminum and magnesium or refractory particles are also present. The substance is adsorbed by the gas bubbles, and the cleaning of the molten metal proceeds. The non-metallic inclusions adsorbed by the gas bubbles float on the surface of the molten metal as skims, but since the swirling flow near the surface of the molten metal is guided to the floating slag separation chamber 10 by the partition wall 10A described above, the skim is caused by the slag separation chamber. Therefore, skim can be removed in the separation chamber 10.

Next, FIG. 10 shows a case where the blowing gas blowing and the overflow are used together. In this case, the weir 22 is arranged in the second outlet flow path 13 and the second outlet flow is set. Road 1
Close 3. The intermediate flow path 11 and the first outlet flow path 15 are opened without disposing the weirs 20A, 20B; 21A, 21B, and the auxiliary gutter 23 is also removed. In this state, as shown by the arrow in FIG. 10, the molten metal to be treated flows into the gas treatment chamber 2 from the inlet port 5 through the inlet side flow path 7, and in the gas treatment chamber 2 in the same manner as described above. The molten metal that has been subjected to the fluxing gas blowing process flows into the excess chamber 3 through the intermediate flow path 11 and is filtered by the filter 14 to remove impurities such as non-metallic inclusions. It is discharged from the discharge port 6 to the outside via the outlet side flow path 15. In this case, it is usual to perform heating in both the gas processing chamber 2 and the excess chamber 3 with an immersion heater or the like in order to prevent the molten metal temperature from decreasing.

Further, FIG. 11 shows a case where the molten metal is cleaned only by excess, and in this case, the second
The weir 22 is arranged in the outlet side flow path 13 of the second outlet side flow path 1
3 is closed, and an auxiliary gutter 23 is bridged between the inlet side flow path 7 and the intermediate flow path 11. The intermediate flow passage 11 and the first outlet-side flow passage 15 are provided with weirs 20A, 20B;
Leave A and 21B open without placing them. In this state,
As indicated by the arrow in FIG. 11, the molten metal to be treated flows into the auxiliary trough 23 from the inlet through the inlet side flow path 7, and then through the auxiliary trough 23 to the intermediate chamber 11 into the excess chamber 3. To do. After being filtered by the filter 14 in the excess chamber 3, it is discharged from the discharge port 6 to the outside through the first outlet passage 15. Therefore, in this case, the molten metal is the gas treatment chamber 2
Since it does not flow into the gas treatment chamber 2, it is not necessary to heat the molten metal in the gas processing chamber 2, and it is sufficient to heat the molten metal by the immersion heater or the like only in the excess chamber 3.

In the above embodiments, the first outlet 2B and the second outlet 2C are separately formed as the outlets of the gas processing chamber 2, but depending on the arrangement configuration of the gas processing chamber 2 and the excess chamber 3, It is also possible to combine both exits with one exit.

Effect of the Invention In the molten metal cleaning device of the present invention, by attaching and detaching a detachable weir and an auxiliary gutter to each flow path, the molten metal is sequentially introduced into the gas processing chamber and the excess chamber to perform fluxing. A state in which both cleaning by gas blowing and over-cleaning are performed, a state in which molten metal is flowed into the gas processing chamber only to perform cleaning by fluxing gas, and molten metal is only in the over chamber. It can be selectively used in three states of inflowing and performing only cleaning due to excess. Therefore, it is most suitable depending on required quality of molten metal, end product application, or cleanliness of molten metal before treatment. The cleaning mode can be arbitrarily selected. Especially, in the cleaning apparatus of the present invention, when the above-mentioned proper use is performed, the molten metal is not allowed to flow into the unused side of the gas processing chamber and the excess chamber. It is not necessary to heat to prevent temperature drop,
As a result, running costs can be minimized and consumption of tank walls in unused chambers can be reduced,
It is also possible to extend the life of the tank body.

[Brief description of drawings]

FIG. 1 shows the upper position of the cleaning device of the present invention (see FIG. 2I-
2 is a vertical sectional view taken along line II-II in FIG. 1, FIG. 3 is a vertical sectional front view taken along line III-III in FIG. 1, and FIG. FIG. 5 is a perspective view showing an example of an auxiliary gutter used in the cleaning device of the present invention, and FIG. 6 is a vertical sectional view showing an example of a gas blowing device used in the cleaning device of the present invention. A front view, FIG. 7 is a cross-sectional view taken along the line VII-VII of FIG. 6, FIG. 8 is a perspective view showing an example of a guide member provided directly below the gas blowing device, and FIGS. FIG. 2 is a cross-sectional plan view at the same position as in FIG. 1, showing a situation in which the cleaning device of the present invention is used properly. 2 ... Gas processing chamber, 3 ... Over chamber, 5 ... Inlet port, 6 ... Outlet port, 7 ... Inlet side channel, 11 ... Intermediate channel, 13 ... First outlet side channel, 15 ... Second outlet Side channel, 20A, 20B, 21
A, 21B ... Weir, 23 ... Auxiliary gutter.

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Yoichi Oshima, Yoichi Oshima, 4-3-18 Nihombashi Muromachi, Chuo-ku, Tokyo Within Sky Aluminum Co., Ltd. Furnace Materials Co., Ltd. Kyushu Factory (72) Inventor Saizo Tsuruoka 3-1 Asamu-cho, Omuta-shi, Fukuoka Tokyo High-class Furnace Materials Co., Ltd. Kyushu Factory (72) Inventor Hiromi Muto 3-Amuta-cho, Omuta-shi, Fukuoka 1 Tokyo Luxury Furnace Materials Co., Ltd. Kyushu factory

Claims (1)

[Scope of utility model registration request] Claim: What is claimed is: 1. A molten metal cleaning method comprising a gas treatment chamber for blowing a fluxing gas into a molten metal to clean the molten metal and an excess chamber for passing the molten metal through a filter, which are adjacently integrated with each other. In the equipment, an inlet side flow path is formed between the inlet for introducing untreated molten metal from the outside and the inlet of the gas treatment chamber, and an intermediate flow is formed between the outlet of the gas treatment chamber and the excess chamber. A passage is formed, and a first outlet-side flow path is formed between the discharge port for discharging the treated molten metal to the outside and the outlet of the excess chamber, and the discharge port and the gas treatment chamber Second between the exit
And a weir that is detachably arranged in the intermediate flow path and the first and second output side flow paths to close these flow paths, and the inlet side flow path. It is equipped with an auxiliary gutter that is detachably hung between the flow path and the intermediate flow path to directly connect these flow paths. By attaching and detaching these weirs and auxiliary gutters, molten metal is introduced. Between the mouth and the outlet, it is configured so that it can be switched to three states of passing through both the gas treatment chamber and the excess chamber, passing only the gas treatment chamber, and passing only the excess chamber. An apparatus for cleaning molten metal, characterized in that