JPS6254039A - Metal recovering apparatus - Google Patents

Abstract

PURPOSE:To efficiently separate and recover metal to be recovered without obstructing vaporizing surface of molten metal, by providing three tightly closed vessels, etc., removing impurities as slag from collected molten metal, then distilling it. CONSTITUTION:The titled apparatus is composed of the first tightly closed vessel 1 providing a mixed gas introducing port 7 and contg. a molten alloy 9 therein, the second tightly closed vessel 2 communicated thereto and having means for removing impurity as slag, the third tightly closed vessel 3 for separating metal to be recovered, means 16, 45, 46 for sending and supplying the molten metal 9 and heating means 55-58 for heating the vessels 1-3. By this apparatus, gaseous mixture contg. vapor of metal to be recovered, oxidizing gas and impurity is introduced to molten metal in a metal vapor collecting vessel 4 to separate and remove oxidizing gas. Impurity is removed as slag in the next vessel 2, then metal to be recovered is efficiently separated and recovered by distillation in the vessel 3.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is a method for collecting vapor and impurities in a mixed gas containing vapor of a metal to be recovered obtained by a reduction reaction, an oxidizing gas, and impurities in a molten metal. to form a molten alloy,
The present invention relates to a metal recovery device used to carry out the method of separating metal from the molten alloy.

Conventional technology The metal is recovered by introducing the vapor and impurities in the mixed gas containing the vapor of the metal to be recovered, oxidizing gas, and impurities obtained by a reduction reaction into the collected molten metal to form a molten alloy. As one of the methods for recovering in a liquid phase state, the inventors of the present invention have disclosed a method of recovering metallic magnesium vapor and carbon monoxide in Japanese Patent Application No. 57-4285 filed by the same applicant as the present applicant. In a method for recovering metallic magnesium from a mixed gas containing magnesium, the mixed gas is guided to a wide-spread nozzle, and the mixed gas is rapidly cooled by adiabatic expansion by the wide-spread nozzle. We have proposed a method characterized by introducing a metal selected from the group consisting of a mixture of the following into a molten metal, thereby recovering metallic magnesium in the molten metal in a liquid phase state. According to this method, metallic magnesium can be recovered in a liquid phase extremely efficiently and safely.

The inventors of the present application have further advanced the method described above to match the efficiency with which the metal vapor is collected in the molten metal to be collected, so that the metal to be recovered from the molten alloy can be collected extremely efficiently and continuously. Attempts were made to develop a device to separate and recover the substances by means such as distillation. However, in such attempts, the surface of the molten alloy is covered with slag mainly composed of impurities.
Therefore, there was a problem in that the distillation efficiency deteriorated considerably.

In addition, when separating metals from a molten alloy by distillation, an additional energy is required to heat the molten alloy, and when condensing the vapor generated from the molten alloy, the latent heat of vaporization is lost due to heat radiation. There was a problem in that a large amount of heat was lost.

Furthermore, when open maintenance is performed on a recovery device that is in operation, the metal to be recovered is rapidly oxidized because molten alloy with a high concentration of recovered metal and a high melting point is stored in each closed container. There is a problem in that ignition is likely to occur due to this, and therefore, it is difficult to perform maintenance work safely on the recovery device while it is in operation.

Purpose of the Invention The present invention has been made in view of the above-mentioned problems in conventional metal recovery equipment, particularly the problem of reduced distillation efficiency, and an object of the present invention is to provide an improved metal recovery equipment that does not cause such problems. There is.

According to the present invention, a mixed gas containing the vapor of the metal to be recovered obtained by a reduction reaction, an oxidizing gas, and impurities is introduced into the collected molten metal to collect the molten alloy. A metal recovery device used for carrying out the method of separating and removing the oxidizing gas and separating the metal from the molten alloy has a mixed gas introduction port and forms the molten alloy therein. a first sealed container configured to a third closed container communicating with the closed container and having means for separating the metal from the molten alloy; and a first conveyor for feeding the molten alloy from the first closed container to the second closed container. a second feeding means for feeding the molten alloy from which the impurities have been removed from the second airtight container to the third airtight container; Achieved by a metal recovery device having a third feeding means for feeding the collected molten metal to the sealed container, and a heating means for maintaining the insides of the first to third 1!5r3IM containers at predetermined temperatures, respectively. be done.

Effects and Effects of the Invention According to the above-described configuration, the molten alloy consisting of the collected metal, the metal to be recovered, and impurities formed in the first closed container is transferred to the second closed container. The impurities contained in it are removed as slag and then sent to the third sealed container, so that when the metal to be recovered is separated by distillation etc. in the third sealed container, In this case, the evaporation surface of the molten alloy is not covered by the slab, and therefore, the metal particles to be recovered can be separated and recovered extremely efficiently and continuously.

Detailed Features of the Invention As mentioned above, the inventors of the present application have conducted various studies on the previously proposed method and the apparatus used to carry out the method, and as a result, have solved the following problems and achieved good results. We have discovered the configuration of a metal recovery device that can obtain the following metals.

(1) Removal of impurities The molten alloy formed in the first sealed container contains trace amounts of impurities (reverse reaction products, unreacted materials, etc.), and if this is purified by distillation etc., the alloy will The surface of the molten metal is covered with slag made of impurities, and the evaporation efficiency of metal vapor is significantly impaired. Therefore, it is desirable to remove slag from the molten alloy.

If it is impossible to remove slag, the evaporation area of the molten alloy can be increased or the heating temperature of the molten alloy can be increased. Therefore, it is not possible to increase the size of the metal recovery equipment.

Further, when the heating temperature of the molten alloy is increased, problems such as a decrease in the durability of the evaporation container and an increase in heat loss occur.

For example, when magnesium vapor is collected in a lead bath to form alloy melt 1 (MO-Pb alloy) consisting of magnesium and lead, and metallic magnesium vapor is generated from the alloy melt to separate and recover metallic magnesium. In this case, when the molten alloy is a 10wt% M(]-Pb alloy with a clear surface, the evaporation coefficient α in the following equation (1) when the temperature of the alloy is 900°C is 0. However, when there is floating slag on the surface, the evaporation coefficient α becomes 0.0005 to 0.001, and experiments show that the evaporation efficiency decreases to 1/10 to 1/60. has been confirmed.

G=5.23X102αPa ・ (1) where G: Evaporation amount (g/sec) α: Evaporation coefficient P: Saturated vapor pressure at T'K (torr) ■=Solution FI
A temperature (°K) M: Molecular weight of the molten metal a: Evaporation area (cm') When compensating for this decrease in evaporation efficiency by increasing the surface area of the molten alloy, the surface area of the molten alloy should be 10~
It is necessary to increase the amount by 60 times, and if compensation is made by increasing the temperature of the molten alloy, even if the temperature of the molten alloy is increased to 1200° C., the rate of increase in evaporation content is less than 3.7 times.

Therefore, it is extremely effective to remove floating slag from the molten alloy in order to wait for the required metal vapor evaporation M@ by using a compact industrial device and operating it at an appropriate temperature. I understand.

According to one detailed feature of the invention, the impurity removal means is separated from the molten alloy reservoir by a partition wall and a molten alloy reservoir communicating with the first closed container via the first feeding means. a molten alloy feeding tank, the molten alloy feeding tank communicates with the alloy storage tank through a communication hole provided in a partition wall, and communicates with a third sealed container via a second feeding means. , the molten alloy storage tank has a capacity sufficient to store the molten alloy at a flow rate of substantially zero, and the impurity removing means removes the surface of the molten alloy stored in the molten alloy storage tank. The impurities are separated from the molten alloy by preventing floating slag from flowing into the slag storage tank through the communication hole. Further, the second feeding means is configured to feed the molten alloy from which impurities have been separated from the bottom of the molten alloy feeding tank to the third closed container.

According to another detailed feature of the invention, in the above case, the impurity removal means has a slag reservoir communicating with the molten alloy reservoir across a weir, and the molten metal slag stored in the alloy reservoir is The slag floating on the surface of the molten alloy flows over the weir into the slag storage tank, thereby removing impurities from the molten alloy.

Therefore, according to this configuration, the molten alloy formed in the first closed container is in a state where the flow velocity is substantially zero in the second closed container, and the molten alloy is kept in a substantially stationary state after being beaten. As a result, impurities contained in the molten alloy become slag and float to the surface of the molten alloy, and are thereby separated from the molten alloy. Especially in the case of the latter configuration mentioned above, the slag flows through the weir. Since the impurities are removed by flowing into the slag storage tank, the impurities are automatically separated and removed from the molten alloy without consuming any energy.
It is ensured that metals are efficiently separated and recovered by distillation or the like in the third closed container.

(2) Separation of metal According to the present invention, impurities are separated and removed from the molten alloy in the second closed container as described above, so that the third closed container is substantially free of impurities. The molten alloy is fed to the third closed container, so that the metal can be efficiently and continuously separated and recovered by distillation.

According to one detailed feature of the invention, the means for separating the metal from the molten alloy is configured to heat the molten alloy to generate a vapor of the metal from the molten alloy and to condense the vapor. There is.

(3) Effective use of heating energy The molten alloy is placed in the first and second containers to prevent the metal to be recovered from the molten alloy from evaporating and to prevent the molten alloy from evaporating.
In the evaporation chamber of the third closed vessel, the temperature is kept at a relatively low enough temperature to maintain the metal in a sufficiently liquid state, and the temperature is kept at a relatively low enough temperature to efficiently generate the vapor of the metal to be recovered from the molten alloy. Must be held at high temperatures. In addition, the collected molten metal becomes a molten alloy by collecting the vapor of the metal to be recovered in the first sealed container, and then flows into the third sealed container via the second sealed container. After the metal to be recovered is separated by evaporation separation in the third sealed container, substantially only the collected molten metal is left in the first closed port 1.
It is returned to the container and thus circulates through the first to third closed containers. Therefore, the temperature of the collected molten metal needs to be raised and cooled each time it passes through the first to third closed containers.

According to one detailed feature of the invention, each of the second and third feeding means includes means for effecting heat exchange between the molten alloy flowing therein and the molten metal collected. are doing. According to this configuration, the molten alloy to be heated in the third closed container is preheated by the collected molten metal returned from the third closed container to the first closed container, and the molten metal is preheated from the third closed container. The collected molten metal, which should be cooled when being returned to the first sealed container, is cooled by the molten alloy fed from the second sealed container to the third sealed container, so that the heat held by the molten alloy is This reduces the heat loss associated with heating and cooling the molten alloy.

(4) Effective use of latent heat When the molten alloy is heated in the third sealed container and the metal to be recovered is evaporated, the metal is taken away from the molten alloy when it evaporates. The latent heat is released in the condensing chamber. Generally, this amount of heat is enormous.

For example, the latent heat when magnesium evaporates is 1250 k
cal/kg, and the temperature of molten magnesium at 100℃
This is an extremely large amount of heat compared to the heat required to raise the temperature (m 147 kcal/kg).

According to one detailed feature of the invention, the second feeding means and the third closed vessel are arranged so that the molten alloy flowing through the second feeding means and the third sealed vessel are connected to each other. It is configured to perform heat exchange with the metal vapor that is formed. According to this configuration, the latent heat held by the metal vapor generated from the molten alloy is used to heat the alloy vapor introduced into the third closed container, so that the metal vapor is heated by distilling the molten alloy. It is possible to reduce heat loss when recovering.

(5) Stirring of molten alloy In the first sealed container, metal vapor and impurities introduced into the first sealed container via the mixed gas introduction port are collected in the collected molten metal. As a result, a molten alloy is formed, and after impurities are removed from the molten alloy thus formed in a second closed container, the metal to be recovered is separated and recovered in a third closed container. will be held. Therefore, it is preferable that the molten alloy fed to the second closed container contains a high concentration of the metal to be recovered.

According to one detailed feature of the invention, the first closed vessel has means for stirring the molten alloy within the first closed vessel. According to this configuration, the molten metal to be collected and the metal and impurities to be recovered are stirred in the first closed container, so that the molten alloy having a relatively high degree of metal to be recovered is mixed with the second molten metal. It is ensured that the metal is fed to the closed container, thereby making it possible to efficiently separate and recover the metal in the third closed container.

(6) Capacity of the second sealed container The total amount of waste present in the metal recovery equipment during operation is the collection of metal vapor in the first sealed container and the collection of metal vapor in the third sealed container. The amount of hot water corresponding to a relatively high metal ma that allows both evaporation of During maintenance, the concentration of the molten alloy is preferably a relatively low concentration that can lower the melting point of the molten alloy to a temperature range that is safe for maintenance so that problems such as ignition do not occur. Therefore, when the concentration of molten alloy metal is reduced and maintenance is performed to open the equipment, it can be assumed that the amount of molten metal collected is constant, so the total depletion in the metal recovery equipment is
The amount of metal to be recovered from the molten alloy decreases by an amount corresponding to the amount separated and removed. In this way, as the total amount of molten metal existing in the metal recovery device fluctuates, for example, the amount of molten alloy stored in the first and third sealed containers may become more than the maximum allowable molten metal or less than the allowable minimum molten metal, respectively. If these airtight containers no longer function effectively due to fluctuations, it becomes impossible to restart the operation of the metal recovery device after opening maintenance of the metal recovery device.

According to one detailed feature of the invention, the second sealed container has a maximum amount of total hot water corresponding to the case where the concentration of the molten alloy is at the maximum i1 degree necessary for steady operation of the metal recovery device. , the fluctuation of the amount of hot water that makes the total amount of hot water necessary to achieve a sufficiently safe low temperature for maintenance of the opening of the metal recovery equipment as the minimum temperature,
It has a sufficient capacity to absorb fluctuations in the amount of molten S in the first and second closed containers so that their functions are not impaired.

According to this configuration, even if the total amount of hot water existing in the metal recovery device fluctuates between the maximum amount of hot water and the minimum hot stone, the functions of the first and second sealed containers are not impaired.
After opening maintenance of the metal recovery device, the operation of the metal recovery device can be resumed in a normal state.

The metal recovery apparatus according to the present invention is applicable to the separation and recovery of any metal, and is particularly suitable for the recovery of metals such as magnesium and calcium, which are difficult to separate and recover safely using conventional methods. Furthermore, the collected metal used when operating the metal recovery device according to the present invention is mixed with the metal to be recovered to form a eutectic molten alloy, and the molten alloy is subjected to a treatment such as distillation. For example, in the recovery of magnesium, the collection metal may be any metal from the group consisting of lead, bismuth, tin, antimony, and mixtures thereof. Good selected metals are used.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention will be explained in detail below by way of example embodiments with reference to the accompanying figures.

Embodiment FIG. 1 is an illustrative plan sectional view showing one embodiment of the metal recovery apparatus according to the present invention, and FIG. 2 shows the embodiment shown in FIG. 1 developed along the flow of molten metal. FIG. In these figures, 1 to 3 indicate first to third closed containers, respectively. The first closed container 1 has a metal vapor collection tank 4, a circulation tank 5, and a pump tank 6 inside. The first airtight container 1 is provided with a diverging nozzle 7 as a gas introduction port above the metal vapor collection tank 4.
A mixed gas of vapor of the metal to be recovered, impurities such as reverse reaction products, and oxidizing gas such as carbon monoxide generated in a reduction furnace (not shown in the figure) is passed through the wide nozzle 7.
The liquid is then introduced into the first sealed container. A jet stream 8 consisting of a mixed gas cooled to a temperature that does not cause a reverse reaction, that is, an oxidation reaction of the metal to be recovered, is caused by the wide-end nozzle 7 into the molten metal to be collected, such as lead, stored in the metal vapor collection tank 4. is guided to the metal vapor collection tank 4.
Inside, a molten alloy 9 is formed consisting of the collected molten metal, the recovered metal, and impurities.

The metal vapor trap mm4 is connected to the circulation tank 5 by a passage 11 having a weir 10 in the middle, and the circulation tank has a weir 1 in the middle.
2 is in communication with the pump tank 6 , which is in communication with the metal vapor collection tank 4 by a conduit 14 .

A pump 16 driven by an actuator 15 (a motor in the illustrated embodiment) is provided in the pump tank 6, and the pump moves the molten alloy 9 in the metal vapor collection tank 4 through the passage 11 and through the circulation. It is continuously circulated to the metal vapor collection tank 4 through the tank 5, passage 13, pump tank 6, and passage 14, and as a result, the collected molten metal and the recovered metal are stirred, and the metal vapor inside the metal vapor collection tank is The recovered metal collected in the molten alloy is efficiently guided to the circulation tank 5 as a molten alloy. Further, in the illustrated embodiment, the tip of the conduit 14 has 100 ports at the upper part of the metal vapor collection tank 4, and the conduit 14
The molten alloy supplied from the pump tank 6 falls into the molten alloy stored in the metal collection tank 4, thereby assisting in stirring the molten alloy. Further, an exhaust tower 17 is provided at the top of the first closed container 1, and a vacuum pump 19 is connected to the upper end of the exhaust tower through a conduit 18, whereby the air is introduced into the first closed container. The oxidizing gas in the mixed gas is discharged to the outside of the first closed container, and the inside of the first closed container is maintained at a reduced pressure of a predetermined pressure P+.

The second sealed container 2 includes a molten alloy storage m20, a slag storage tank 22 separated from the molten alloy storage tank by a weir 21,
A pump tank 24 as a molten alloy feeding tank separated from the molten alloy storage tank by a partition wall 23, a heat exchange tank 26 separated from the pump tank 24 by a partition wall 25, and a partition wall 27.
The pump tank 28 is separated from the heat exchanger 11!26 by the heat exchanger 11! The molten alloy storage tank 20 is connected to the circulation tank 5 of the first closed container through a conduit 29 as a first feeding means. An on-off valve 3 is provided in the slag storage tank 22.
A conduit 31 having a diameter of 0.0 is connected in communication, so that the slag stored in the slag storage tank 22 can be selectively discharged to the outside of the slag storage tank by opening the on-off valve 30.

The heat exchange tank 26 has a molten alloy passage 33 and a collected molten metal passage 34 that are separated from each other by a partition wall 32, and heat exchange is performed between the molten alloy flowing through them and the collected molten metal. It is supposed to be done.

The inlet 35 of the molten alloy passageway 33 is connected to the bottom of the molten alloy storage tank by a passage 36, and the outlet 37 of the molten alloy passageway communicates with the pump tank 24. The inlet 38 of the collected molten metal passage 34 is connected to the inside of the third sealed container 3 through a conduit 39, and the outlet 4 of the collected molten metal passage
0 is connected to the pump tank 28 through a passage 40a. In Fig. 2, the conduit 39 and the passage (conduit 40a) are broken in the middle to avoid complication of the diagram, but the ends A and B of these conduits are connected to the heat exchange tank, respectively. The inlet (38) and outlet (
40) (see Figure 1).

The pump reservoirs 24 and 28 are connected in communication with the interior of the third closed container and the pump reservoir 6 of the first closed container by conduits 41 and 42, respectively. In addition, pumps 45 and 46 are provided in the pump tanks 24 and 28, respectively, which are driven by actuators 43 and 44, so that the molten alloy in the pump tank 24 is pumped through the conduit 41.
The collected molten metal in the pump tank 28 is then forced into the pump tank 6 via a conduit 42 by a pump 46. Thus passage 3
6. The molten alloy passage 33, the pump tank 24, the pump 45, and the conduit 41 serve as a second feeding means for feeding molten alloy from the molten alloy storage tank 20 of the second sealed container into the third sealed container 3. The conduit 39, the collected molten metal passage 34, the pump tank 28, the pump 46, and the conduit 42 feed the collected molten metal from the third closed container 3 to the pump tank 6 of the first closed container. It constitutes the third feeding means.

The molten alloy storage tank 20 has a capacity sufficient to store the molten alloy at a flow rate of substantially zero, and impurities contained in the molten alloy stored in the molten alloy storage tank 20 are removed from the alloy. The slag floats on the surface of the molten metal, and the slag crosses the weir 21 and flows into the slag storage tank 22. Thus, the weir 21 and the slag storage tank 22 constitute impurity removal means for removing impurities contained in the molten alloy stored in the molten alloy storage tank as slag.

The third sealed container 3 defines an evaporation chamber 47 in which vapor of the metal to be recovered is generated from the molten alloy by heating the molten alloy supplied thereto through the conduit 41. As shown in FIG. 2, the conduit 41 has a portion 41a that extends in close contact with the side wall 48 of the third sealed container, and the molten alloy flowing within the portion and the molten metal generated in the evaporation chamber 47 are Heat exchange can be performed between the steam and the recovered metal vapor. The tip of the conduit 39 opens into the evaporation chamber 47 at a position spaced above the bottom wall of the third closed container.
The metal to be recovered from the molten alloy stored in the evaporation chamber is separated by evaporation, so that the concentration of the metal to be recovered is reduced near the liquid surface, and as a result, only the collected molten metal is effectively drained into the conduit by overflow. 39.

The evaporation chamber 47 is connected to a condensing device 50 through a conduit 49, and the vapor of the metal to be recovered generated in the evaporation chamber 47 is guided into the condensing device 50 through the conduit 49, and is then introduced into the condensing device 50. The metal is liquefied by being cooled and stored as a molten metal 53 in a condensing device. A conduit 52 having an on-off valve 51 in the middle is connected to the bottom of the condensing device 50, and by opening the on-off valve 51, the molten metal 53 to be recovered is discharged from the condensing device 50.
can be selectively taken out at t1454. In the illustrated embodiment, the portion 41a of the conduit 41 extends vertically along the side wall 48 of the third enclosure; It may be provided so as to extend spirally around the side wall of the condensing device 50 in close contact therewith, or may be provided so as to extend within the evaporation chamber 47 or within the condensing device 50.

Heaters 55 to 58 are arranged around the first to third closed containers and the condensing device 50, respectively, to maintain the insides thereof at predetermined temperatures T1 to T4. In addition, the inside of the second and third sealed containers are set to predetermined pressures P2 and Pa, respectively, at the start of operation of the metal recovery equipment.
Vacuum pumps 59 and 60 are connected to the conduit 61, respectively.
and 62 are connected in communication. Further, in the illustrated embodiment, the highest liquid level of the molten alloy stored in the second closed container 2 is lower than the lowest liquid level of the molten alloy stored in the first and third closed containers. The relative height positions of the first to third sealed containers are set so that the molten alloy in the circulation tank 5 and the collected molten metal in the evaporation chamber 47 of the third sealed container are connected to conduits, respectively. 29 and 39, it flows into the inlet 38 of the molten alloy storage tank 20 and the heat exchange tank 26 by the action of gravity.

Furthermore, the total amount of molten metal existing in the metal recovery equipment is determined by the maximum amount of metal in the molten alloy, which corresponds to the case where the concentration of recovered metal in the molten alloy is at the maximum concentration required for steady operation of the metal recovery equipment, and the amount of liquid in the molten alloy. Although the amount of recovered metal varies between the minimum amount of hot water necessary to make the concentration sufficiently safe for opening maintenance of the metal recovery equipment, in the illustrated embodiment, the capacity of the second closed container 2 In particular, the total capacity of the alloy molten metal storage IF 20, the alloy molten metal passage 33 of the heat exchange tank 26, and the pump tank 24 is determined by the fluctuation in the amount of molten metal in the first and second closed containers. To absorb fluctuations in the total amount of molten metal in the metal recovery device between the maximum amount of molten metal and the minimum amount of molten metal, so as not to impair the functions of various devices such as pumps installed. The capacity is set to sufficient. That is, the capacity of the second sealed container is significantly larger than the capacity of the first and third sealed containers, and as a result, the total amount of molten metal in the metal recovery device is equal to the maximum amount and the minimum amount measured. The liquid level of the molten metal in the first and third sealed containers does not substantially change even if the liquid level changes between the two.

Next, the operation of the embodiment constructed as described above will be explained. The operation will be described when a mixed gas is introduced into a lead collecting molten metal to form an alloy molten metal, and magnesium is continuously separated and recovered from the alloy molten metal.

First, the heaters 55 to 58 are energized to set the insides of the first to third closed containers 1 to 3 and the condensing device 50 to predetermined temperatures Tl-T4, respectively. Next, molten lead metal as collected molten metal is introduced into the first to third sealed containers for a predetermined amount, and then the insides of the cylinder to third sealed containers are pumped to a predetermined amount by a vacuum pump 19, 59, 60, respectively. After the pressure is reduced and maintained at P+ to P3, the actuator 15
．． Pumps 16, 45, 46 are actuated by 43, 44 respectively.

Thus, in the first sealed container 1, the molten lead in the metal vapor collection tank 4 is pumped by the pump 6 through the passage 11, the circulation tank 5, the passage 13, the pump tank 6.8, the I pipe 14, and the metal vapor collection tank. 4
The molten lead is circulated at a predetermined flow ffi V + to the metal vapor collection tank 4, the passage 11, the circulation tank 5, and the conduit by the pump 6, 45, 46 in the first to third closed containers. 29
, molten alloy storage tank 201 passage 36, molten alloy passage 33 of heat exchange tank 26, pump tank 24, conduit 41, evaporation chamber 47,
It is circulated through the conduit 39, the collected molten metal passage 34 of the heat exchange tank 26, the pump tank 28, the conduit 42) to the metal vapor collection tank 4 at a predetermined flow rate v2 via the pump tank 6 and the conduit 14.

Note that the temperature 1-T4 and the pressure P+-Pa are typically set to the following values.

T+=600['C] T2=600['C] Ta=920['C] Ta=650 ['C] P+ ~0.1~1 [torrl P2=0. 1 to 1 [torrl P3=0.01 to 5 [torrl Also, the ratio V2/Vl of the flow mV2 to the flow m V + is 1
It is set in the range of /20 to 11500, typically about 1/100.

Next, a mixed gas consisting of magnesium vapor, impurities, and carbon monoxide is continuously introduced into the first closed container 1 from the wide-spread nozzle 7 . Magnesium droplets and impurities contained in the jet stream 8 made of a mixed gas cooled by the wide-end nozzle 7 to a temperature at which no reverse reaction occurs are collected in the molten lead stored in the metal vapor collection tank 4. In the tank 4, an alloy melt KA9 consisting of magnesium, impurities, and lead is formed. Further, the carbon monoxide contained in the jet stream 8 is removed from the exhaust tower 17,
The liquid is evacuated from the first sealed container via a conduit 18 by a vacuum pump 19, and the pressure inside the first sealed container is maintained at P+=2 to 20 torr by the vacuum pump 19.

The molten alloy formed in the metal vapor collection tank 4 flows through the passage 11.
, the collection tank 5 and the conduit 29 into the molten alloy storage tank 20. The molten alloy introduced into the molten alloy storage tank 20 is stored with a flow rate of substantially zero, and impurities contained in the molten alloy become slag and float to the surface of the molten alloy, passing through the weir 21. The slag is then discharged to the slag storage tank 22. The molten alloy from which impurities have been removed becomes a molten alloy consisting essentially only of magnesium and lead, and flows into the molten alloy passage 33 of the heat exchange tank 26 via the passage 36 and the inlet 35,
Flowing into the pump tank 24 from the outlet 37 of the molten alloy passage,
Furthermore, the pump 45 passes through the conduit 41 to the third sealed container 3.
is supplied into the evaporation chamber 47.

The molten alloy supplied to the evaporation chamber 47 is heated by the heater 57, whereby magnesium vapor is generated from the molten alloy. The magnesium vapor thus generated flows into the condensing device 50 through the conduit 49, is cooled in the condensing device, becomes liquefied, becomes molten magnesium 53, and is stored in the condensing device 50. . The molten magnesium in the condensing device "fff50" is selectively taken out to the steel plate 54 via the conduit 52 by opening the on-off valve 51.

In the evaporation chamber 47, magnesium is removed as vapor, so that the molten alloy near the liquid surface (hereinafter referred to as molten lead), which has a reduced magnesium concentration and is rich in lead, flows into the conduit 39 by the over 70-. , flows into the inlet 38 of the collecting metal clarification passage 34 of the heat exchange tank 26 by the action of gravity, and in the process of flowing in the collecting molten metal passage 34, it exchanges heat with the alloy mm flowing in the mixing melting passage 33. This heats the molten alloy and lowers its own temperature. The molten lead whose temperature has been lowered in this manner flows into the pump tank 28 through the outlet 40, is supplied by the pump 46 through the conduit 42 into the pump tank 6, and is further circulated in the first closed container 1 by the pump 16. The metal vapor collection tank 4 is supplied with the molten alloy from the pump tank 6 through the conduit 14.

Thus, in the above-described embodiment, the collected molten metal is sequentially circulated through the first to third closed containers, and the recovered metal and impurities are collected in the first closed container, thereby forming the molten alloy. Impurities are removed in the second sealed container, and the recovered metal is separated in the third sealed container, after which it is returned to the cylinder's sealed container for repeated circulation use. . In addition, by circulating the molten alloy by the pump 16 in the first closed container, it is possible to avoid feeding the molten alloy with a low concentration of recovered metals to the second closed container 2. The molten alloy fed to the third sealed N1 container in the heat exchange tank 26 provided in the sealed RII container is heated by the heat held by the collected molten metal heated in the third sealed container. By being heated, the heat can be used effectively, and by cooling the collected molten metal returned to the first closed container, the temperature of the molten alloy in the first closed container increases and Increased loss of recovered metal in the container is avoided. In addition, the molten alloy flowing into the third sealed container is preheated by the latent heat held by the vapor of the recovered metal generated in the third sealed container, so that the latent heat is effectively utilized. By preliminarily cooling the vapor of the metal to be recovered, condensation of the vapor is promoted. Furthermore, impurities are removed as slag from the molten alloy in the second sealed container.
The evaporation efficiency in the evaporation chamber of the third sealed container is improved, thereby ensuring that the metal to be recovered is efficiently separated and recovered from the molten alloy.

FIG. 3 is a schematic plan sectional view showing another embodiment of the metal recovery device according to the present invention, and FIG. 4 shows the embodiment shown in FIG. 3 developed along the flow of molten metal. It is an illustrative longitudinal cross-sectional view. In these figures, members that are substantially the same as those shown in FIGS. 1 and 2 are designated by the same reference numerals.

This embodiment is suitable for industrial implementation, and the first hermetic container 1 and the second hermetic container 2 are formed integrally with each other. The metal vapor collection tank 4 and the circulation tank 5 are
The circulation tank 5 and the pump tank 6 are connected to each other via $F10.
and are connected to each other without a weir. Further, the alloy melting and depleting storage tank 20 provided in the second closed container 1 communicates with the circulation tank 5 across a weir 63, and also has a partition wall 64.
It is separated from the pump tank 6 by. Further, a pump tank 24 is defined within the second closed container 2, and the pump tank is separated from the alloy melting and depleting storage tank 20 by a partition wall 23. The pump tank 24 is connected to the alloy melting and depleting storage tank 20 through a communication hole 65 provided in the partition wall 23 at a position close to the bottom wall of the second closed container. Furthermore, the heat exchange tank 26, pump tank 28, etc. are not provided in the second closed container 2, and the evaporation chamber 47 of the third closed container 3 is connected to the conduit 3.
It is directly connected to the pump tank 6 by 9.

This embodiment is otherwise constructed in the same manner as the embodiment shown in FIGS. 1 and 2, and may be modified in the same manner as in that embodiment.

Next, the operation of the embodiment configured as described above will be explained in the same way as in the case of the previous embodiment. The operation will be described when a mixed gas consisting of is introduced into a molten metal collecting lead to form a molten alloy, and magnesium is continuously separated and recovered from the molten alloy.

First, the heaters 55 to 58 are energized to set the insides of the first to third closed containers 1 to 3 and the condensing device 50 to predetermined temperatures Tl-74. A predetermined amount of molten lead as a collected molten metal is introduced into each of the sealed containers, and then the insides of the cylinders to third sealed containers are brought to a predetermined pressure P+ by a vacuum pump 19.60.
The pressure is reduced to -Ps. The second and third secret! After the inside of each 'ffj container is reduced to a predetermined pressure, the operation of the vacuum pump 60 is stopped, and the pumps 16.45 are activated by the actuators 15.43.

Thus, in the first sealed container 1, the molten lead in the metal vapor collection tank 4 is pumped by the pump 6 into the metal vapor collection tank 4 through the circulation tank 5, the pump tank 6, and the conduit 14 in a predetermined flow mV. In the first to third closed containers, the molten lead is circulated by pumps 45 and 16 to the metal vapor collection tank 4.I. It is circulated to the metal vapor collection tank 4 at a predetermined flow v2 through the circulation tank 5, alloy melting/depletion storage tank 20, pump tank 24, conduit 41, evaporation chamber 47, conduit 39, pump tank 6, and channel @14. Ru. Note that the temperature r+-1-< and the pressures P1 to P3 are typically set to the same values as in the previous embodiment.

In addition, the ratio V2/vI of the flow IV t to the flow weight is in the range of 1/20 to 11500, as in the above embodiment.
Typically, it is set to about 1/100.

Next, a mixed gas consisting of magnesium vapor, impurities, and carbon monoxide is continuously introduced into the first closed container 1 from the wide-spread nozzle 7 . Magnesium droplets and impurities contained in the jet stream 8 made of a mixed gas cooled by the wide-end nozzle 7 to a temperature at which no reverse reaction occurs are collected in the molten lead stored in the metal vapor collection tank 4. In the tank 4, a molten alloy 9 consisting of magnesium, impurities, and lead is formed. Further, carbon monoxide contained in the jet stream 8 is exhausted through the exhaust tower 17 and the conduit 18 to the outside of the first and second closed containers by the vacuum pump 19. Pressure is P+ = Pt = 2~20t
orrk: Maintain tL 8° The molten alloy formed in the metal vapor collection tank 4 flows into the circulation tank 5 over 1110, and further flows into the alloy melting and depletion storage tank 20 over the weir 63. The molten alloy introduced into the molten alloy storage tank 20 is stored with a flow rate of substantially zero, and impurities contained in the molten alloy become slag and float to the surface of the molten alloy, passing through the weir 21. The slag is then discharged to the slag storage tank 22. The molten alloy from which impurities have been removed becomes a molten alloy consisting essentially of only magnesium and lead, flows into the pump tank 24 through the communication hole 65, and is further pumped into the third sealed container 3 via the conduit 41 by the pump 45. It is supplied into the evaporation chamber 47.

The molten alloy supplied to the evaporation chamber 47 is heated by the heater 57, whereby magnesium vapor is generated from the molten alloy. The magnesium vapor thus generated flows into the condensing device 50 through the conduit 49, is cooled in the condensing device, becomes liquefied, becomes dissolved magnesium vIA53, and is stored in the condensing device 50. The molten magnesium in the condensing device 50 is tRI III valve 51
By opening the valve, it is selectively taken out through the conduit 52 to the extraction w454.

In the evaporation chamber 47, magnesium is removed as vapor, so that the magnesium concentration is reduced and the lead-rich molten alloy near the liquid surface, that is, the molten lead, flows into the conduit 39 by overflow, and is pumped by the action of gravity. 16 and is further circulated in the first closed container 1 by the pump 16 together with the molten alloy from the pump tank 6 to the conduit 1.
4 is supplied to the light metal vapor collector 1ff4.

Thus, in this embodiment as well, the collected molten metal is sequentially passed through the first to third closed containers, and the recovered metal and impurities are collected in the first closed container. The alloy becomes molten metal, impurities are removed in the second sealed container, and the recovered metal is separated in the third sealed container, after which it is returned to the sealed container in the cylinder for repeated circulation. used. ``Also, in the first sealed container, pump 1
By circulating the molten alloy in step 6, it is avoided that the molten alloy with a low concentration of recovered metal is sent to the second sealed container 2, and the molten alloy flowing into the third sealed container is transferred to the third sealed container. The recovered metal vapor generated in the closed container is preheated by the latent heat it possesses, so that the latent heat is effectively utilized, and the collected molten metal returned to the first closed container is cooled. This prevents the temperature of the molten alloy in the first and second closed containers from increasing and the evaporation of the recovered metal in those containers from increasing.

Furthermore, since impurities are removed as slag from the molten alloy in the second sealed container, the evaporation efficiency in the evaporation chamber of the third sealed container is improved, and as a result, the metal to be recovered is removed from the molten alloy. It is ensured that separation and recovery is carried out efficiently.

Although the present invention has been described above in detail with reference to two embodiments, the present invention is not limited to these embodiments, and various other embodiments are possible within the scope of the present invention. This will be obvious to those skilled in the art.

[Brief explanation of the drawing]

Fig. 1 is an illustrative plan sectional view showing one embodiment of the metal recovery device according to the present invention, and Fig. 2 is an illustrative diagram showing the embodiment shown in Fig. 1 developed along the flow of molten metal. Longitudinal cross-sectional view, 3rd
The figure is an illustrative plan sectional view showing another embodiment of the metal recovery device according to the present invention, and FIG. 4 is an illustrative diagram showing the embodiment shown in FIG. 3 developed along the flow of molten metal. FIG. 1... First airtight container, 2... Second airtight container, 3
...Third closed container, 4. Metal vapor collection tank, 5.
... Circulation tank, 6... Pump tank, 7... Wide end nozzle,
8...Jet stream. 9... Molten alloy, 10... Shoes, 11... Passage, 1
2...Weir. 13... Passage, 14... Conduit, 15... Actuator. 16... Pump, 17... Exhaust tower, 18... Conduit, 19... Vacuum pump, 20... Alloy melt temperature storage tank,
21...Weir. 22...Slag storage tank, 23...Partition wall, 24...
・Pump tank, 25... Partition wall, 26... Heat exchange tank,
27... Partition wall, 28... Pump tank, 29... Conduit, 30... Open/close valve, 31... Conduit, 32... Partition wall, 33... Molten alloy passageway, 34... ...Catching molten metal passage, 35...in 0.36...passage, 37...
Out 0.38...In 0.39...S tube. 40... Outlet, 40a... Passage (conduit), 41.4
2... Conduit, 43.44... Actuator, 45
．． 46... Pump, 47... Evaporation chamber, 48... Side wall, 4... Conduit, 50... Condensing device, 51...
Opening/closing valve, 52... Conduit, 53... Molten metal to be recovered, 54... Ladle, 55-58... Heater, 59.6
0...Vacuum pump, 61.62...Conduit, 63...
・Weir, 64... Partition wall, 65... Communication hole Figure 3

Claims (7)

[Claims] (1) A mixed gas containing the vapor of the metal to be recovered obtained by the reduction reaction, an oxidizing gas, and impurities is introduced into the collected molten metal to form a molten alloy, and the oxidizing gas is separated and removed. , a metal recovery device used for carrying out the method of separating and recovering the metal from the molten alloy; a first sealed container having a mixed gas introduction port and configured to form the molten alloy therein; a second sealed container communicating with the first sealed container and having an impurity removing means for removing the impurities as slag from the molten alloy; and a second sealed container communicating with the first and second sealed containers and removing the impurities from the molten alloy as slag. a third closed container having means for separating metal; a first feeding means for feeding the molten alloy from the first closed container to the second closed container; a second feeding means for feeding the molten alloy from which impurities have been removed to the third sealed container; and feeding the collected molten metal from the third sealed container to the first sealed container. and a heating means for maintaining the insides of the first to third sealed containers at predetermined temperatures. (2) In the metal recovery apparatus according to claim 1, the impurity removing means is formed by a molten alloy storage tank and a partition wall communicating with the first closed container via the first feeding means. a molten alloy feeding tank separated from the molten alloy storage tank, the molten alloy feeding tank communicating with the alloy storage tank through a communication hole provided in the partition wall, and the second feeding tank; The molten alloy storage tank is in communication with the third sealed container via a means, and the molten alloy storage tank has a capacity sufficient to store the molten alloy at a flow rate of substantially zero, and the impurity The removing means removes the impurities from the molten alloy by preventing slag floating on the surface of the molten alloy stored in the molten alloy storage tank from flowing into the molten alloy feeding tank through the communication hole. A metal recovery device configured to separate. (3) In the metal recovery apparatus according to claim 2, the impurity removing means has a slag storage tank communicating with the molten alloy storage tank across a weir, and the slag is stored in the molten alloy storage tank. The metal recovery device is characterized in that the slag floating on the surface of the molten alloy flows over the weir and into the slag storage tank, thereby removing the impurities from the molten alloy. (4) In the metal recovery apparatus according to any one of claims 1 to 3, the means for separating the metal from the molten alloy heats the molten alloy to separate the metal from the molten alloy. A metal recovery device configured to generate steam and condense the steam. (5) In the metal recovery apparatus according to claim 4, the second and third feeding means exchange heat between the molten alloy flowing therein and the molten metal collected. A metal recovery device characterized in that it has a means for performing. (6) In the metal recovery apparatus according to claim 4 or 5, the second feeding means and the third sealed container are arranged so that the molten metal flows through the second feeding means. A metal recovery apparatus characterized in that it is configured to perform heat exchange between the metal vapor and the metal vapor generated in the third closed container. (7) In the metal recovery apparatus according to any one of claims 1 to 6, the first closed container has means for stirring the molten alloy in the first closed container. A metal recovery device characterized by: