JP2007262545A - Slag removing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a slag removing device with which in the case of removing the slag floated up on molten metal from a molten metal vessel of a refining furnace or a ladle, etc., holding the molten metal, such as molten iron, molten steel, the greater part of slag can be removed several times in operations, with a simple constitution, even in the case of the molten metal vessel having deep depth, such as a converter. <P>SOLUTION: In the slag removing device 1, the slag 10 existing on the surface of the molten metal 9 held in the molten metal vessel 6 is scraped out from a slag-exhausting hole in the molten metal vessel with a scraping plate fit to the tip end part of a supporting arm 3 so as to be reciprocatively shiftable in the horizontal direction, wherein the scraping plate is composed of an annular body 4 of the metal plate which is elastically deformable and one end part at the front side of scraping-out direction with this annular body or the one end part at the reverse side to the scraping-out direction is fitted to the supporting arm and even in the case of contacting the annular body 4 with the slag-exhausting hole, this annular body can pass through while being elastically deformed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an exhaust device for discharging slag present on a molten metal bath surface accommodated in a molten metal container such as a refining furnace and a ladle.

  In the refining of molten metal such as hot metal and molten steel, a refining agent is used as a means of removing impurities present in the molten metal, and a method of removing the refining agent by reacting with the added refining agent is widely used. . In this case, the refining agent generally becomes a molten or semi-molten slag and floats on the bath surface of the molten metal, and the impurities migrate to the slag. In addition, as in hot metal desiliconization, the impurity silicon may be oxidized by the refining agent, and the impurity itself may become molten slag.

  Since impurities in the slag may return to the molten metal when the atmospheric conditions change, in order to efficiently remove the impurities, it is necessary to remove the slag containing the impurities from the molten metal bath surface. When refining the next process without removing the slag containing impurities, for example, when the refining of the previous process is a reduction reaction and the refining of the subsequent process is an oxidation reaction, The removed impurities may return to the molten metal by refining in the subsequent process, and the meaning of carrying out the refining in the previous process may be lost.

In such molten metal refining, a method is also practiced in which slag is once discharged during refining, and then a refining agent is further added for refining. For example, in Patent Document 1, in refining molten iron to produce molten steel, as a first step, slag basicity (CaO / SiO ₂ ) is 0.7 to 2.2, total iron (T.Fe ) Is adjusted to 10 to 30% by mass, and the treatment end temperature is adjusted to 1200 to 1450 ° C., and the dephosphorization refining is performed. As the second step, 60% or more of the generated slag is discharged by overturning the converter. Then, a converter refining method is proposed as a third step in which decarburization refining is performed after the converter is upright. In this case, in order to maintain the productivity of the converter and at the same time perform the decarburization refining in the third step efficiently, it is necessary to perform the intermediate waste quickly and reliably.

  As a method for discharging slag from the converter, (1) the molten metal is transferred from a dedicated outlet (referred to as a tapping outlet) to another molten metal container, and then the converter is rotated to remove the slag remaining in the furnace. There are two methods: a method of discharging from the converter furnace port, and (2) a method of discharging only the slag on the molten metal from the furnace port by overturning the converter. Although the former method can separate molten metal and slag quickly with high accuracy, it is necessary to discharge the molten metal from the converter, and cannot be applied to the above-described intermediate waste. Therefore, although the intermediate drainage is performed by the latter method, there are cases where it cannot be easily discharged depending on the properties of the slag, such as insufficient hatching and high slag viscosity.

Therefore, Patent Document 2 proposes a method for adjusting the basicity and Al ₂ O ₃ content of the slag to predetermined ranges and controlling the viscosity of the slag to an optimum range for rejection when performing intermediate elimination. ing. However, in this method, the slag composition is not necessarily the optimum composition for the refining conditions, and there is a problem that the refining, which is the original function, may be hindered.

  On the other hand, various methods for discharging slag by mechanical means have been performed. For example, it has been practiced for a long time to attach a scraping plate to the tip of a rod (support arm) and scrape the slag manually. However, the furnace mouth is generally circular, and the scratching width changes from narrow to wide to narrow as the scratching position changes from the back to the center to the near side. The scraping efficiency is poor, and it is necessary to repeat the scraping operation over and over again. In order to prevent this, Patent Document 3 proposes a multi-arm dragger displacing device in which a plurality of scrapers with support arms are arranged in the horizontal direction, and Patent Document 4 discloses a molten metal container using a slag detection device. There has been proposed a dragger displacing device that recognizes the position of the slag in the interior and scrapes the recognized position as a scraping path.

However, the mechanisms of Patent Documents 3 and 4 are complicated, and there is a problem that the equipment cost is high. In addition, if the evacuation device is large and the majority of the evacuation device is located outside the molten metal container, such as scraping out slag floating in a molten metal container deep in a metal bath such as a ladle, etc. Although applicable, when a slag is scraped out from a molten metal container having a shallow and deep bath such as a converter, it is not suitable because it is necessary to extend the support arm to the back of the container. In addition, there is a possibility that problems such as the operation of the apparatus being hindered or the apparatus being damaged may occur due to the scraper being caught by a protrusion made of metal or slag adhering to the furnace wall.
JP-A-7-70626 JP 2004-323959 A JP 2000-227282 A JP 2003-13129 A

  Despite the need for a slagging device that quickly and reliably discharges slag from a molten metal container such as a smelting furnace or ladle, conventional means have not been satisfactory as described above. In particular, there has been no appropriate evacuation device for discharging slag from a refining furnace having a shallow bath and a deep depth such as a converter.

  In recent years, in the iron and steel industry, refining methods such as dephosphorizing hot metal using a converter and subsequently decarburizing and refining hot metal in the same converter have been carried out, and slag can be removed quickly and reliably. More and more than ever before, there was a need for a method to do this.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to slag that floats on a molten metal from a molten metal container such as a refining furnace or a ladle containing molten metal such as molten iron or molten steel. In order to discharge the slag, an object of the present invention is to provide a slag discharge device that has a simple structure and can discharge most of the slag by several operations even in a deep molten metal container such as a converter.

  In the evacuation apparatus according to the first aspect of the present invention for solving the above-described problem, the slag present on the molten metal bath surface accommodated in the molten metal container is horizontally attached to the tip of the support arm. In the evacuation device that scrapes out from the culm discharge port of the molten metal container by a reciprocating scraper, the scraper plate is made of an annular body of a metal plate, and one end of the annular body in the scraping direction is attached to the support arm. It is characterized by being.

  According to a second aspect of the present invention, there is provided a slag device that is attached to the tip of a support arm and is capable of reciprocating in a horizontal direction with a scraper that is present on a molten metal bath surface accommodated in a molten metal container. In the evacuation device that scrapes out the slag discharge port of the molten metal container, the scraper plate is made of an annular body of a metal plate, and one end of the annular body opposite to the scraping direction is attached to the support arm. It is a feature.

  According to a third aspect of the present invention, in the second aspect of the present invention, the annular body has one end on the near side in the scraping direction of the annular body attached to the second support arm, and the second support of the annular body. The connecting portion with the arm is characterized in that it can be moved in the vertical direction and the front-rear direction by the operation of the second support arm.

  According to a fourth aspect of the present invention, there is provided a waste disposal apparatus according to any one of the first to third aspects, wherein the molten metal container has a converter-type melting having a larger internal cross-sectional area than a cross-sectional area of the soot discharge port. A metal container, wherein the annular body has a width larger than the inner diameter of the soot discharge port of the molten metal container, and the annular body passes elastically when passing through the soot discharge port. After passing through, it returns to its original shape.

  According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the metal plate is made of the same type of metal as the molten metal contained in a molten metal container. Is.

  According to a sixth aspect of the present invention, in any one of the first to fifth aspects, the rejecting device includes a disconnecting mechanism capable of remotely disconnecting the support arm and the scraper. It is characterized by this.

  According to a seventh aspect of the present invention, in any one of the first to sixth aspects, the molten metal is a hot metal.

  When scraping slag from a molten metal container such as a converter or ladle, the slag is scraped from the opening or the dredging outlet of the molten metal container with the molten metal container tilted or tumbled. The upper opening of the molten metal container is circular, and when the molten metal container is inclined or tumbled, the molten metal bath surface accommodated in the molten metal container is seen in the slag scraping direction. As it changes from the back to the center to the near side, it changes from narrow to wide to narrow. That is, when the scraper is inserted into the molten metal container, the inlet portion is narrow, the center portion is wide, and the deepest portion at the back is narrower.

  In the evacuation device according to the present invention, the scraper plate is configured by an annular body made of a metal plate capable of elastic deformation, with one end on the front side in the scraping direction or one end opposite to the scraping direction connected to the support arm. Therefore, when passing through a narrow inlet part, it deforms narrowly according to the dimensions of the inlet part, and when inserted in the center part, it returns to its original shape due to the restoring force of the metal plate, and widens the area at once. Can be scraped. Moreover, since the metal plate is deformed in accordance with the shape of the wall of the molten metal container by being pressed against the deepest wall, the slag existing in the deepest portion can be scraped out efficiently. Furthermore, even if the metal or slag adheres to the side wall of the molten metal container and the protrusion is present, the scraper plate is easily deformed, so that the slag can be scraped out efficiently regardless of the presence of the protrusion. it can. Furthermore, since the slag is scraped out in a state surrounded by an annular body, the slag that escapes to the back side of the scraper is reduced, and the slag can be scraped out efficiently. Moreover, since the structure is simple, the equipment cost can be suppressed.

  Hereinafter, the present invention will be specifically described with reference to the accompanying drawings, taking as an example the case of scraping slag from a converter.

  When the slag generated by dephosphorization is discharged from the converter after the hot metal dephosphorization is performed using the converter, the bath surface of the hot metal 9 in the furnace is located at the furnace port 7 as shown in FIG. The converter 6 is rolled over so as to coincide with the level at the lower end. In this case, in order to prevent the hot metal 9 from flowing out from the hot water outlet 8, the converter 6 is turned over so that the hot water outlet 8 is on the upper side. In the case of the converter 6, no special soot discharge port is provided, and the furnace port 7 becomes the soot discharge port. Here, FIG. 1 is a schematic side cross-sectional view of a rolled-up converter.

  When the rolled-up converter 6 is viewed from the front side of the furnace port 7, it is as shown in FIG. That is, the width of the bath surface of the hot metal 9 is the narrowest in the vicinity of the furnace port 7, and becomes wider as it goes to the central part of the converter 6, and has a substantially constant width in the central part. If it becomes the deepest part of the furnace bottom side of the converter 6 from the center part, it will become narrow again. That is, the scraped surface of the slag 10 changes from narrow to wide to narrow as it changes from the front side to the center side to the back side as viewed from the scraping side. For this reason, when the width of the scraper is adjusted to the narrow position of the site of the furnace port 7, most of the slag 10 is removed from the path of the scraper at the center. 2, only the internal shape of the converter 6 is shown, the outer shell shape is omitted, and the slag 10 existing on the hot metal 9 is omitted.

  In order to efficiently reject even in such a situation, in the rejecting device of the present invention, an annular body formed by bending a metal plate into an annular shape is employed as a scraping plate. The annular body and the support arm are attached at two locations on the front side in the scraping direction (referred to as “first embodiment”) and on the opposite side to the scraping direction (referred to as “second embodiment”). First, a description will be given of a first embodiment in which the attachment position between the annular body, which is a scraper, and the support arm is the front side in the scraping direction.

  3 and 4 show an example of the first embodiment. As shown in FIGS. 3 and 4, in the evacuation apparatus 1 according to the first embodiment of the present invention, an annular body 4 obtained by bending a metal plate into an annular shape is used as a scraping plate, and the annular body 4 is on the front side in the scraping direction. The support arm 3 is connected. As shown in FIG. 4, the annular body 4 has an elliptical shape whose major axis is the scraping direction, and the elliptical short axis (referred to as “width of the annular body 4”) is equivalent to the width of the central portion of the converter 6. It is about the width. Therefore, a large amount of slag 10 can be discharged by one scraping. Even if the width of the annular body 4 is larger than the inner diameter of the furnace port 7, in the evacuation apparatus 1 of the present invention, the annular body 4 that is a scraper plate is formed of a metal plate that can be elastically deformed. When passing through the narrow part of the furnace port 7, as in the annular body 4A shown in FIG. 4, the contact part with the furnace port 7 is deformed narrowly according to the dimension of the furnace port 7, while the central part is When inserted, the metal plate returns to its original shape due to the restoring force of the metal plate, so that a large area can be scraped out at a time.

  Moreover, since the slag 10 to be scraped is surrounded by the annular body 4 when scraped, the slag 10 that escapes to the back side of the annular body 4 is reduced, and the slag 10 can be scraped out efficiently. . Further, even if the metal or slag adheres to the side wall of the converter 6 and the projections are present, the annular body 4 is deformed following the projections, so that the slag 10 can be efficiently used regardless of the presence of the projections. Can scrape well. Still further, the evacuation device 1 of the present invention only uses the annular body 4 formed by bending the metal plate in an annular shape as a scraping plate, and the structure of the evacuation device 1 is simple. it can.

  FIG. 3 is a schematic side sectional view showing the positional relationship between the waste disposal apparatus 1 according to the present invention and the rolled-up converter 6, and reference numeral 2 in the figure is the waste disposal apparatus body. A support arm 3 provided with an annular body 4 as a scraper at the tip thereof is moved up and down by the squeezing device main body 2 and can be reciprocated in the horizontal direction inside the converter 6. FIG. 4 is a schematic cross-sectional plan view showing a deformation state of the annular body 4 when the support arm 3 of the waste disposal apparatus 1 according to the present invention is inserted into the converter 6.

  In the present invention, the annular body 4 made of a metal plate is elastically deformed when passing through the narrow furnace port 7, and needs to return to its original shape when passing through the furnace port 7, that is, spread. For this purpose, the deformation must be within the elastic limit of the material. However, since the elastic limit of the material changes depending on the dimensions of the converter 6 and the apparatus conditions, it is impossible to set the thickness of the metal plate uniformly. Therefore, the thickness of the metal plate is the following (1) to ( It is determined by the process of 5).

  That is, (1) Assuming the plate thickness, (2) Giving deformation under conditions that pass the furnace port by the finite element method, (3) Calculate the stress of each element, (4) Each stress exceeds the yield point (5) If each stress does not exceed the yield point, adopt the assumed plate thickness. If each stress exceeds the yield point, reset the plate thickness ( Start over from 1).

  In this way, the thickness of the metal plate is determined. In addition, since tension | tensile_strength is applied to a metal plate when discharging | emitting slag 10, it is preferable to set it as thick as possible in the range in which elastic deformation is accept | permitted. From the examination results of the inventors by the above method, when the metal plate is made of a steel material, it is confirmed that the thickness of the metal plate is in the range of 1 mm to 5 mm, preferably about 1.5 mm to 2.5 mm. Yes. If the thickness of the metal plate is less than 1 mm, the heat capacity becomes small and the number of uses decreases, and if the thickness of the metal plate exceeds 5 mm, the strength increases and elastic deformation becomes difficult. The width of the metal plate, that is, the height of the annular plate 4 is not particularly specified, but is preferably about 500 mm to 1000 mm from the viewpoint of facilitating the discharge of the slag 10.

  Further, when the annular body 4 is inserted further into the converter 6 than the center of the converter 6 and pressed against the bottom of the converter 6, the annular body 4 follows the shape of the bottom of the converter 6 as shown in FIG. As a result of the deformation, the gap between the annular body 4 and the bottom of the converter 6 becomes small, so that the slag 10 existing in the deepest part can be scraped out efficiently. FIG. 5 is a schematic plan cross-sectional view showing a deformation state of the annular body 4 when the annular body 4 which is a scraper of the waste disposal apparatus 1 according to the present invention contacts the bottom of the converter 6.

  When scraping out the slag 10 from the furnace port 7, the portion of the furnace port 7 is narrower than the central part, but as shown in FIG. 6, the annular body 4 is deformed following the dimensions of the furnace port 7. The slag 10 leaking to the inside of the furnace can be minimized, and the slag 10 can be scraped out efficiently. In this case, by setting the width of the connection portion of the annular body 4 to the support arm 3 to be narrower than that of the furnace port 7, the resistance when the annular body 4 is taken out of the furnace is reduced and can be easily taken out. . FIG. 6 is a schematic plan cross-sectional view showing a deformation state when the annular body 4 which is a scraper of the evacuation apparatus 1 according to the present invention passes through a portion of the furnace port 7 of the converter 6.

  Further, when the annular body 4 is taken out of the furnace, the support arm 3 and the annular body 4 are inclined so that the connecting portion with the support arm 3, that is, the front side in the scraping direction of the annular body 4 becomes higher as shown in FIG. By doing so, the annular body 4 can be easily deformed following the shape of the furnace port 7. FIG. 7 is a schematic side sectional view showing the positional relationship of the annular body 4 when the support arm 3 is tilted.

  Although the annular body 4 may have a shape close to a perfect circle, the annular body 4 can be easily taken in and out of the converter 6 by forming an elliptical shape that is long in the scraping direction. In that case, it is preferable that the width of the annular body 4 is set to the same size as the inside of the converter 6 as shown in FIG. By doing in this way, it becomes possible to scrape a large amount of slag 10 by one scraping. FIG. 8 is a schematic plan sectional view showing an elliptical annular body 4 having the same size as the inside of the furnace.

  Next, a description will be given of a second embodiment in which the attachment position of the annular body 4 that is a scraping plate and the support arm 3 is opposite to the scraping direction.

  9 and 10 show an example of the second embodiment. As shown in FIGS. 9 and 10, in the evacuation apparatus 1 according to the second embodiment of the present invention, an annular body 4 obtained by bending a metal plate into an annular shape is used as a scraping plate, and the annular body 4 is opposite to the scraping direction. And is connected to the support arm 3. That is, the support arm 3 exists above the annular body 4 and is connected to the annular body 4 on the side opposite to the scraping direction. Other configurations are the same as those of the first embodiment, and the description thereof is omitted. By doing in this way, when inserting the annular body 4 in a furnace, it becomes easy to control the movement of the annular body 4, and the annular body 4 can be smoothly inserted in a furnace.

  As shown in FIG. 10, the annular body 4 in this case also has an elliptical shape with the scraping direction as a major axis, and the elliptical minor axis, that is, the width of the annular body 4 is equal to the width of the central portion of the converter 6. It is about the width. Therefore, a large amount of slag 10 can be discharged by one scraping. Even if the width of the annular body 4 is larger than the inner diameter of the furnace port 7, the annular body 4 that is a scraping plate is made of a metal plate that can be elastically deformed, as in the first embodiment. Therefore, when passing through the narrow furnace port 7 portion, as shown in FIG. 11, the contact portion with the furnace port 7 is deformed narrowly according to the size of the furnace port 7 and is inserted into the center portion. The metal plate can be restored to its original shape by the restoring force of the metal plate, so that a large area can be scraped out at a time.

  Moreover, since the slag 10 to be scraped is surrounded by the annular body 4 when scraped, the slag 10 that escapes to the back side of the annular body 4 is reduced, and the slag 10 can be scraped out efficiently. . Further, even if the metal or slag adheres to the side wall of the converter 6 and the projections are present, the annular body 4 is deformed following the projections, so that the slag 10 can be efficiently used regardless of the presence of the projections. Can scrape well. Still further, the evacuation device 1 of the present invention only uses the annular body 4 formed by bending the metal plate in an annular shape as a scraping plate, and the structure of the evacuation device 1 is simple. it can. 9 is a schematic side sectional view showing the positional relationship between the waste disposal apparatus 1 according to the present invention and the rolled-up converter 6, and FIG. 10 is a plan view of the support arm 3 of the waste disposal apparatus 1 according to the present invention. FIG. 11 is a schematic cross-sectional view showing the state of the annular body 4 when inserted into the furnace 6, and FIG. 11 is a part of the furnace port 7 of the converter 6 where the annular body 4, which is a scraping plate of the waste disposal apparatus 1 according to the present invention It is a plane section schematic diagram showing a deformation situation when passing through.

  When scraping out the slag 10 from the furnace port 7, the portion of the furnace port 7 is narrower than the center portion, but the annular body 4 is deformed according to the dimensions of the furnace port 7 as shown in FIG. Therefore, the slag 10 leaking into the furnace can be minimized, and the slag 10 can be scraped out efficiently. In this case, by setting the width of the annular body 4 on the front side in the scraping direction to be narrower than the furnace port 7, the resistance when taking it out of the furnace is reduced, and it can be easily taken out.

  9 and 10, in the evacuation device 1 of the second embodiment, the front side of the annular body 4 in the scraping direction is not connected to the support arm 3, and the furnace port is taken out when the annular body 4 is taken out of the furnace. In some cases, smooth removal may be hindered due to an increase in the resistance to 7. In order to prevent such a situation, as shown in FIG. It is preferable that the scraper side of the annular body 4 is also movable in the vertical direction or the front-rear direction. The second support arm 3 </ b> A is also connected to the evacuation device main body 2 and is configured to operate by the evacuation device main body 2. FIG. 12 is a schematic side sectional view showing the positional relationship between the waste disposal apparatus 1 according to the present invention having the second support arm 3 </ b> A and the rolled-up converter 6.

  In the waste disposal apparatus 1 having the second support arm 3A, as shown in FIG. 13, the second support arm 3A is shown in the figure with the tip of the support arm 3 in contact with the furnace bottom of the converter 6. By operating in the direction of the arrow, the annular body 4A can be deformed like the annular body 4 following the shape of the bottom of the converter 6. By doing in this way, since the clearance gap between the annular body 4 and the bottom part of the converter 6 becomes small, the slag 10 which exists in the deepest part can also be scraped out efficiently. Further, when the annular body 4 is taken out of the furnace, it is desirable to incline the support arm 3 and the annular body 4 so that the front side in the scraping direction of the annular body 4 becomes higher as shown in FIG. By installing the second support arm 3A, the annular body 4 can be easily inclined so that the front side in the scraping direction becomes higher. FIG. 13 shows an annular body 4 when the second support arm 3A is operated and the annular body 4 is pressed against the bottom side of the converter 6 in the waste disposal apparatus 1 having the second support arm 3A according to the present invention. It is a plane cross-sectional schematic diagram which shows the deformation | transformation condition of this, and the code | symbol 4A represents the condition of the annular body 4 before pressing.

  In the evacuation device 1 shown in FIG. 12, the second support arm 3A receives the load of the annular body 4, so that the structure of the evacuation device 1 is complicated, but as shown in FIG. A movable portion 15 that can move the support arm 3 is provided, the movable portion 15 and the front side in the scraping direction of the annular body 4 are coupled, and the second support arm 3A is coupled to the movable portion 15, thereby The support arm 3A is not subjected to the load of the annular body 4, and the structure of the evacuation device 1 can be simplified. In this case, the width of the movable portion 15 needs to be smaller than the inner diameter of the furnace port 7. The evacuation device 1 shown in FIG. 14 can also move in the same manner as the evacuation device 1 shown in FIG.

  In the first and second embodiments, the metal plate constituting the annular body 4 that is a scraper is preferably the same type of metal as the hot metal 9, that is, iron, steel, or an iron-based alloy. By doing in this way, even if the annular body 4 is dissolved in the molten iron 9, it does not become an impurity. Moreover, when the annular body 4 becomes unusable, it can be effectively used as an iron source by being put into the converter 6. When the molten metal is other than the hot metal 9, the metal is the same type as the molten metal.

  Furthermore, it is preferable to install a separation mechanism capable of remotely separating the support arm 3 and the annular body 4. Even if it becomes difficult to take out the annular body 4 out of the furnace because the annular body 4 is welded to slag, metal or the like attached to the furnace wall, the annular body 4 is separated from the support arm 3 remotely, Damage to the evacuation apparatus 1 can be minimized. In this case, the annular body 4 remains in the furnace, but is melted by the heat of the hot metal 9 in the furnace, and the influence on the refining process can be ignored.

  Any mechanism may be used as the separation mechanism, and for example, the separation mechanism 5 shown in FIG. 15 may be used. That is, a rotary hook 11 having a shaft 11A as a rotation axis is provided at the tip of the support arm 3, and the rotary hook 11 is fitted and fixed to the fitting portion 14 of the annular body 4, and a wire is used for disconnection. This is a mechanism in which the rotary hook 11 is removed from the fitting portion 14 by pulling 12. A spring 13 is attached to the rotary hook 11 so that the rotary hook 11 normally does not rotate.

  In the waste disposal apparatus 1 according to the present invention configured as described above, the annular body 4 deforms narrowly according to the dimensions of the inlet portion when passing through the narrow inlet portion of the portion of the furnace port 7, and the converter When inserted into the center portion of 6, the metal plate constituting the annular body 4 is restored to its original shape by the restoring force of the metal plate 4, and a large area can be scraped out at a time. Moreover, since the metal plate which comprises the annular body 4 deform | transforms according to the shape of the wall of the converter 6 by pressing on the wall of the deepest part, the slag 10 which exists in the deepest part can also be scraped out efficiently. Moreover, since the structure is simple, the equipment cost can be suppressed.

  In the above description, the molten metal container is used as a converter and the molten metal is used as hot metal, but the present invention is not limited to the above description and can be applied in various ways. For example, the present invention can be applied to a case where a molten metal container is a ladle type container and slag is discharged from the ladle type container. Moreover, it can apply along the above even if it is a molten steel instead of hot metal, and also a nonferrous metal.

It is a side cross-sectional schematic diagram of the converter rolled over. It is the schematic which looked at the converter turned over from the front of the furnace port. It is a side cross-sectional schematic diagram which shows the positional relationship of the waste disposal apparatus of the 1st Example of this invention, and the rolled-up converter. It is a plane cross-sectional schematic diagram which shows the deformation | transformation condition of an annular body when the support arm of the waste disposal apparatus shown in FIG. 3 is inserted in the converter. It is a plane cross-sectional schematic diagram which shows a deformation | transformation condition when the annular body which is a scraper of the waste disposal apparatus shown in FIG. 3 contact | abuts to the bottom part of a converter. It is a plane cross-sectional schematic diagram which shows a deformation | transformation condition when the annular body which is a scraper of the waste disposal apparatus shown in FIG. 3 passes through the site | part of the furnace port of a converter. FIG. 4 is a schematic side cross-sectional view showing the positional relationship of the annular body when the support arm is inclined in the rejecting device shown in FIG. 3. FIG. 4 is a schematic plan cross-sectional view showing an elliptical annular body having the same size as the inside of the furnace in the waste disposal apparatus shown in FIG. 3. It is a side cross-sectional schematic diagram which shows the positional relationship of the waste disposal apparatus of the 2nd Example of this invention, and the rolled-up converter. It is a plane cross-sectional schematic diagram which shows the state of a cyclic | annular body when the support arm of the waste disposal apparatus shown in FIG. 9 is inserted in the converter. It is a plane cross-sectional schematic diagram which shows a deformation | transformation condition when the annular body which is a scraper of the waste disposal apparatus shown in FIG. 9 passes the site | part of the furnace port of a converter. It is a side cross-sectional schematic diagram which shows the positional relationship of the waste disposal apparatus of the 2nd Example of this invention which has a 2nd support arm, and the rolled-up converter. FIG. 13 is a schematic cross-sectional plan view showing a deformation state when the second support arm is operated and the annular body is pressed against the bottom side of the converter in the waste disposal apparatus of the present invention shown in FIG. 12. It is a side cross-sectional schematic diagram which shows the positional relationship of the other example of the waste disposal apparatus of the 2nd Example of this invention which has a 2nd support arm, and the rolled-up converter. It is the schematic which shows the example of a separation mechanism.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Exhaust device 2 Exhaust device main body 3 Support arm 4 Ring body 5 Separation mechanism 6 Converter 7 Furnace port 8 Hot water outlet 9 Hot metal 10 Slag 11 Rotating hook 12 Wire 13 Spring 14 Fitting part 15 Movable part

Claims (7)

  Slag that scrapes the slag present on the bath surface of the molten metal contained in the molten metal container from the slag discharge port of the molten metal container by a scraping plate attached to the tip of the support arm and capable of reciprocating in the horizontal direction. In the apparatus, the scraping plate is formed of a metal plate annular body, and one end of the annular body on the front side in the scraping direction is attached to the support arm.   Slag that scrapes the slag present on the bath surface of the molten metal contained in the molten metal container from the slag discharge port of the molten metal container by a scraping plate attached to the tip of the support arm and capable of reciprocating in the horizontal direction. In the apparatus, the scraping plate is formed of a metal plate annular body, and one end of the annular body opposite to the scraping direction is attached to the support arm.   One end of the annular body on the front side in the scraping direction of the annular body is attached to the second support arm, and the connection portion of the annular body with the second support arm is vertically moved by the operation of the second support arm. The evacuation device according to claim 2, wherein the evacuation device is movable in the front-rear direction.   The molten metal container is a converter type molten metal container having a larger internal cross-sectional area than the cross-sectional area of the soot discharge port, and the width of the annular body is larger than the inner diameter of the soot discharge port of the molten metal container. The annular body is elastically deformed when passing through the soot discharge port, and returns to its original shape after passing through the soot discharge port. The exclusion apparatus as described in any one of these.   The evacuation apparatus according to any one of claims 1 to 4, wherein the metal plate is made of the same type of metal as the molten metal housed in a molten metal container.   6. The evacuation device according to claim 1, wherein the evacuation device includes a detachment mechanism that can detach the support arm and the scraper plate remotely. apparatus.   The waste metal device according to any one of claims 1 to 6, wherein the molten metal is hot metal.

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