JP3197534U - Hot water receiving member, tilting rod and slag bucket - Google Patents

Abstract

An object of the present invention is to provide a molten metal receiving member capable of further improving the durability of a hot water contact portion where molten metal such as a tilted pouring rod and slag bucket falls, shortening the construction time of the pouring rod and slag bucket, and suppressing manufacturing costs. An decanting rod and a slag bucket using the same are provided. A pouring receptacle having a laying portion 32 having a hot water contact portion 20 for receiving a high-temperature fluid to be poured, mainly formed by a castable, and side wall portions 33, 34 extending from at least a part of a peripheral portion of the laying portion 32. It is a member, Comprising: The said hot water contact part 20 was comprised with the non-fired magnesia-carbon fixed brick. [Selection] Figure 3

Description

  The present invention relates to a pouring receiving member used for a hot water hitting portion, an inclined pouring rod and a slag bucket using the same.

  Conventionally, tilting irons have been proposed that receive hot metal via a tap extending from a blast furnace. The tilting iron is tilted after receiving the hot metal, so that the received hot metal is put into a conveying container such as a torpedo car or a hot metal ladle.

  This tilting rod is formed by pouring a castable material having fluidity on site or by building a large number of bricks on site. In the former case, the durability is not always sufficient. In the latter case, there is a problem that prior melting damage occurs in the joints between the bricks, time is required for building, and the bricks are dropped depending on use conditions.

There are also the following problems. Generally, the tilting rod is arranged lower than the outlet of the tap. Therefore, when the hot metal transitions to the tilting iron, the portion of the tilting iron on which the hot metal that has fallen from the spear landed (hereinafter referred to as the “hot water contact portion”) is damaged by the heat of the hot metal or the impact of the hot metal falling. Becomes intense. As a result, the life of the tilting rod is shortened. Further, in recent years, desiliconization processing has been performed in a tilting rod. The formation of an oxidizing atmosphere and a decrease in the basicity of the slag associated with the desiliconization process at this time are increasing the erosion damage of the portion of the decanted water. In addition, the desiliconization process is a process in which silicon in the molten iron is oxidized to slag as SiO ₂ by adding an iron oxide-based treatment agent to the molten iron accommodated in the tilting iron. By this treatment, silicon in the hot metal can be reduced.

  With respect to such a problem, a tilting iron having a central region that receives the hot metal of the tilting iron is constituted by a precast block and the other part is castable (Patent Document 1). Further, a tilting iron in which a portion that receives hot metal is formed of alumina-chromia fired brick is disclosed (Patent Document 2). However, the tilting iron of Patent Document 1 still has a problem that the hot water contact portion where the hot metal falls greatly melts. This is considered to be because the strength expression due to insufficient heat reception at the initial use of the precast block is not sufficient. Moreover, since the fired brick of patent document 2 uses expensive Cr, it has not yet solved the problem that a manufacturing cost increases and the problem which causes the prior | preceding melting damage of the joint between bricks.

JP2002-69515 JP 2007-217737 A

  The present invention has been made in view of the above-mentioned circumstances, further improving the durability of the hot water contact portion where the molten iron such as the tilting iron and the slag bucket falls, shortening the construction time of the tilting iron and the slag bucket, and the like. An object of the present invention is to provide a pouring receiving member capable of suppressing the manufacturing cost, an inclined pouring rod and a slag bucket using the same.

  In order to solve the above-described problems, a pouring receiving member of the present invention is mainly formed of a castable portion having a hot water receiving portion for receiving a high-temperature fluid to be poured, and a side wall portion extending from at least a part of the peripheral portion of the pouring portion. The hot water receiving member is characterized in that the hot water contact portion is made of unfired magnesia-carbon shaped brick.

  In the present invention, the hot water contact portion, which is considered to be severely melted, is made of unfired magnesia-carbon shaped brick. Usually, the brick which has this magnesia-carbon as a main component is excellent in corrosion resistance by containing magnesia, and is excellent in thermal shock resistance and slag resistance by containing carbon. The present invention uses unfired bricks. As the name suggests, unfired bricks do not require a firing step in the brick manufacturing process. That is, the present invention using non-fired bricks can shorten the time for constructing a tilting rod, a slag bucket, and the like than those using fired bricks, and thus can suppress an increase in manufacturing cost.

  Further, the vertical cross-sectional shape of the non-fired magnesia-carbon shaped brick is trapezoidal, and the trapezoidal shape has a short side on one side in contact with the high-temperature fluid and a long side on the other side facing the short side. It is desirable.

  According to this structure, it can suppress that the non-fired magnesia-carbon fixed brick embedded as hot water hitting parts, such as a tilting iron and a slag bucket, will detach | leave by melting.

  Moreover, it is desirable to use the molten metal receiving member of the present invention as a blast furnace tilting pouring rod or as a slag bucket.

  According to this configuration, it is possible to improve the durability of the blast furnace tilting rod and the slag bucket.

  According to the molten metal receiving member of the present invention, the hot water contact portion, which is considered to be severely melted, is composed of non-fired magnesia-carbon shaped bricks, so that it is excellent in corrosion resistance, thermal shock resistance, and slag resistance. Therefore, it is possible to improve the durability of tilting rods and slag buckets. Moreover, since the non-fired brick which does not contain Cr is used, it is possible to shorten the time for constructing a tilting rod, a slag bucket, and the like, thereby suppressing an increase in manufacturing cost.

Top view of tilting rod of embodiment 1 AA sectional view of a tilting rod in embodiment 1. BB sectional view of the tilting rod in the first embodiment The schematic diagram of the form which equips the blast furnace in Embodiment 1 with the tilting rod. Sectional drawing of the slug bucket of Embodiment 2.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same portions are described using the same reference numerals. FIG. 1 is a plan view schematically showing the tilting rod of the first embodiment. FIG. 2 is a cross-sectional view schematically showing an AA vertical cross section of the tilting rod shown in FIG. 3 is a cross-sectional view schematically showing a BB vertical cross section of the tilting rod shown in FIG. FIG. 4 is a schematic view schematically showing a form in which the tilting rod shown in FIG. 1 is actually used. FIG. 5 is a cross-sectional view schematically showing a vertical cross section of the slag bucket of the second embodiment.

(First embodiment)
Hereinafter, Embodiment 1 of the present invention will be specifically described with reference to FIGS.

  As shown in FIG. 4, the tilting iron 1 of the first embodiment is configured so that the hot metal discharged from the blast furnace 2 functioning as a blast furnace is discharged from the tip end of the intermediate iron 4 via the large iron 3 and the middle iron 4 serving as iron. Receive from 5. The tilting iron 1 that has received this hot metal moves the hot metal to a desired hot metal pan 6 or a torpedo car (not shown) by tilting left and right. This inclined pouring rod 1 corresponds to a pouring receiving member of the present invention.

  The tilting rod 1 is disposed on the tip outlet 5 side of the middle rod 4. The tilting rod 1 includes a tilting rod main body 12 and a hot water contact portion 20.

  The tilting iron main body 12 has hot metal discharge ports 11 formed at both ends in the longitudinal direction, and can tilt in the directions of arrows A1, A2, B1, and B2, as shown in FIG.

  The tilting rod main body 12 includes a steel shell member 14 having a bottom container shape having a bottom surface 13 that rises and slopes toward the distal end in the longitudinal direction, and a castable layer provided in almost the entire area on the bottom surface 13 side of the shell member 14. 30. The castable layer 30 is formed by casting a flowable castable material mainly composed of a refractory. On the upper surface of the castable layer 30, an inclined surface 31 that is a rising surface toward the hot metal discharge port 11 is formed. The hot water contact portion 20 is integrally embedded in the castable layer 30 in the central region in the longitudinal direction of the tilting rod main body 12, and is located between the descending ends of the inclined surfaces 31.

  As shown in FIG. 3, the central region including the hot water contact portion 20 is formed in a bowl shape having a substantially U-shaped vertical cross section (BB cross section), and a bottom portion 32 and a bottom portion 32 are formed. Side wall portions 33 and 34 erected from both sides are integrated. The side wall portions 33 and 34 are arranged to face each other.

  The hot water contact portion 20 is disposed in the central region of the floor portion 32. The hot water contact portion 20 is formed by arranging one or a plurality of unfired magnesia-carbon shaped bricks. The hot water contact portion 20 is formed integrally with the castable layer 30. At this time, it is preferable that the hot water hitting part 20 is one unfired magnesia-carbon shaped brick. Thereby, the joint 20 which is the joint of a brick and a brick does not exist in the hot water contact part 20, and the problem of the melting which tends to occur in a joint part can be avoided.

  Further, the hot water contact portion 20 has a substantially flat shape and has an inner bottom surface 21 on the side in contact with the hot metal, and a conical shape having an outer bottom surface 22 on the castable layer 30 side which is provided facing the inner bottom surface 21 and has a substantially flat shape. A trapezoidal shape is desirable. As shown in FIG. 3, in the vertical sectional view (BB sectional view), it is desirable that the hot water contact portion 20 has a trapezoidal shape in which one side formed by the outer bottom surface 22 is longer than one side formed by the inner bottom surface 21. As a result, even if melting of the floor portion 32 other than the hot water contact portion 20 occurs in advance, the side made by the outer bottom surface 22 is longer than the side made by the inner bottom surface 21 in the vertical cross-sectional view. It can suppress that the non-fired magnesia-carbon fixed brick which comprises 20 slips out.

  As shown in FIGS. 1 and 2, the hot water contact portion 20 is provided only in the central region in the longitudinal direction of the tilting rod 1, and is not provided at both longitudinal ends of the tilting rod 1. The reason is that the hot molten iron flowing from the middle rod 4 is received in the central region in the longitudinal direction of the tilting rod 1 together with the slag having erodibility. For this reason, the center region in the longitudinal direction of the tilting rod 1 is required to have the most durability against hot metal. In many cases, the hot water contact portion 20 of the laying portion 32 is the landing portion of the hot metal falling from the intermediate iron 4 and is the portion most affected by the falling hot metal. Therefore, further durability is required compared with other parts.

  The hot water contact portion 20 is made of unfired magnesia-carbon shaped brick. Of the composition of the non-fired magnesia-carbon shaped brick, the carbon material is not particularly limited, but graphite such as scaly graphite, earthy graphite, artificial graphite, expanded graphite and the like, carbon black, powder pitch, mesophase pitch, etc. Carbonaceous materials can be used. The amount of the carbon material used is preferably 1 to 70% by weight, more preferably 3 to 30% by weight. If it is in this range, the slag permeation in the hot water contact portion 20 of the present embodiment can be more effectively suppressed and the spalling resistance can be improved more effectively.

  Of the composition of non-fired magnesia-carbon shaped bricks, the magnesia raw material is not particularly limited, but each material mainly composed of magnesia such as electrofused magnesia, sintered magnesia, natural magnesite, olivine, dolomite, spinel, etc. Alternatively, two or more kinds can be used in combination. In addition to these magnesia aggregates, a small amount of oxide refractory raw material, non-oxide refractory raw material and the like can be added within a range of 10% by weight or less.

Further, oxidation prevention of metals such as Al, Si, Mg, AlMg, and AlSi, and boron compounds such as B ₄ C, AlB ₂ , CaB ₆ , and MgB ₂ that are generally used for the purpose of preventing oxidation. Agents can be added as needed.

  The method for producing the unfired magnesia-carbon shaped brick according to Embodiment 1 may be the same as the conventional production method. That is, a carbonaceous raw material is added to magnesia aggregate, and metal powder and other known additives are added as necessary, and a binder that forms a carbon bond such as phenol resin, pitch, tar, etc. is preferably 1 to 15% by weight. Is added and kneaded by adding 3 to 8% by weight. And after shaping | molding, low-temperature heat processing of 100-500 degreeC preferably 150-400 degreeC is carried out, and it is set as a non-fired fixed brick.

  The castable layer 30 constituting the floor portion 32 and the side wall portions 33 and 34 excluding the hot water contact portion 20 is an alumina-silicon carbide system, particularly an alumina-silicon carbide-silica system, and among them, alumina-silicon carbide-silica. -It is desirable to be a carbon-based refractory. The weight ratio may include about 65-80% alumina, about 10-30% silicon carbide, about 3-7% silica, and 1-5% carbon. Within this composition range, the spalling resistance can be more effectively improved by adding silicon carbide and carbon, and by adding a part of silicon carbide in the form of ultrafine powder, the oxidation resistance and resistance to carbon can be improved. The hot metal property is improved more effectively.

  The inclined pouring rod 1 which is a hot water receiving member of the present invention is used as follows. The hot metal discharged from the blast furnace 2 positioned higher than the tilting iron 1 flows down from the tip outlet 5 to the tilting iron 1 via the large iron 3 and the middle iron 4. This hot metal is transferred to the hot metal ladle 16 or torpedo car located at a lower position than the tilting iron 1 through the inside of the tilting iron 1 when the tilting iron 1 is tilted in the directions of A1, A2, B1, B2.

  The tilting rod 1 which is the pouring receiving member of the present invention configured as described above is tilted by the hot metal dropped on the hot water hitting portion 20 because the hot water hitting portion 20 is formed of unfired magnesia-carbon shaped brick. It is possible to effectively suppress the erosion of the bowl 1. As a result, the durability of the tilting rod 1 can be increased. In addition, since magnesia-carbon brick is used, it is possible to improve the wear resistance against hot metal and the corrosion resistance against slag. Therefore, it is effective for improving the durability and durability of the tilting rod 1, and as a result, the amount of thread in the tilting rod 1 can be increased.

(Second Embodiment)
Hereinafter, the second embodiment will be described with reference to FIG. In the second embodiment, the slag bucket 60 corresponds to the pouring receiving member of the present invention.

  When making molten steel with a predetermined composition from iron ore, molten slag is generated in each process such as blast furnace, hot metal pretreatment, converter, degassing, continuous casting and the like. These molten slags are generally discharged into the hot metal ladle in each process, and the hot metal ladle is transported to a slag treatment plant by a transportation means such as a railroad or a truck. The slag bucket 60 of this Embodiment 2 is used as this hot metal ladle. When the molten slag is poured into the slag bucket 60, the bottom portion (laying portion) of the slag bucket 60, which is the landing point of the molten slag, is particularly severely damaged by the heat of the molten slag and the impact of the molten slag falling.

  As shown in FIG. 5, the slag bucket 60 is formed by an iron shell member 51 having a deep bottom container shape, and a castable layer 50 provided in an almost entire area on the inner surface side of the shell member 51. The castable layer 50 is formed by casting a castable material having fluidity mainly composed of a refractory.

  The castable layer 50 includes side walls 53 and 54 that are arranged opposite to a floor portion 52 that forms a bottom portion. And the hot water contact part 40 is arrange | positioned in the center area | region of the floor part 52. FIG. The hot water contact portion 40 is made of a material different from that of the castable layer 50 and is embedded in the castable layer 50 integrally.

  The hot water contact portion 40 is formed by arranging one or a plurality of non-fired magnesia-carbon shaped bricks. The hot water contact portion 40 is formed integrally with the castable layer 50. In particular, it is preferable that the hot water contact portion 40 be one non-fired magnesia-carbon shaped brick. Thereby, the joint part which is a joint of a brick and a brick does not exist in the hot water contact part 40, and the problem of the melt | disconnection which tends to occur in a joint part can be avoided.

  The hot water contact portion 40 includes a substantially flat inner bottom surface 41 on the side in contact with the molten slag to be poured, and an outer bottom surface 42 on the castable layer 50 side, which is provided facing the inner bottom surface 41 and has a substantially flat shape. It is desirable to have a truncated cone shape. As shown in FIG. 5, in the vertical cross-sectional view, the shape of the hot water contact portion 40 is desirably a trapezoid in which one side made by the outer bottom surface 42 is longer than one side made by the inner bottom surface 41. As a result, even if melting of the laying portion 52 other than the hot water contact portion 40 occurs in advance, the side made by the outer bottom surface 42 is longer than the side made by the inner bottom surface 41 in the vertical sectional view. It is possible to prevent the unfired magnesia-carbon shaped bricks constituting 40 from coming out.

  The hot water contact portion 40 is made of unfired magnesia-carbon shaped brick. Of the composition of the non-fired magnesia-carbon shaped brick, the carbon material is not particularly limited, but graphite such as scaly graphite, earthy graphite, artificial graphite, expanded graphite and the like, carbon black, powder pitch, mesophase pitch, etc. Carbonaceous materials can be used. The amount of the carbon material used is preferably 1 to 70% by weight, more preferably 3 to 30% by weight. If it is in this range, the slag permeation in the hot water contact portion 20 of the present embodiment can be more effectively suppressed and the spalling resistance can be improved more effectively.

  Of the composition of non-fired magnesia-carbon shaped bricks, the magnesia raw material is not particularly limited, but each material mainly composed of magnesia such as electrofused magnesia, sintered magnesia, natural magnesite, olivine, dolomite, spinel, etc. Alternatively, two or more kinds can be used in combination. In addition to these magnesia aggregates, a small amount of oxide refractory raw material, non-oxide refractory raw material and the like can be added within a range of 10% by weight or less.

In addition, oxidation of metals such as Al, Si, Mg, AlMg, and AlSi, and boron compounds such as B ₄ C, AlB ₂ , CaB ₆ , and MgB ₂ that are generally used for the purpose of preventing oxidation. An inhibitor can be added as needed.

  The manufacturing method of the non-fired magnesia-carbon shaped brick of the present invention may be the same as the conventional manufacturing method. That is, a carbonaceous raw material is added to magnesia aggregate, and metal powder and other known additives are added as necessary, and a binder that forms a carbon bond such as phenol resin, pitch, tar, etc. is preferably 1 to 15% by weight. Is added and kneaded by adding 3 to 8% by weight. And after shaping | molding, low-temperature heat processing of 100-500 degreeC preferably 150-400 degreeC is carried out, and it is set as a non-fired regular brick.

  The castable layer 50 constituting the floor portion 52 and the side wall portions 53 and 54 excluding the hot water contact portion 40 is an alumina-silicon carbide system, particularly an alumina-silicon carbide-silica system, and among them, alumina-silicon carbide-silica. -It is desirable to be a carbon-based refractory. The weight ratio may include about 65-80% alumina, about 10-30% silicon carbide, about 3-7% silica, and 1-5% carbon. Within this composition range, the spalling resistance can be more effectively improved by adding silicon carbide and carbon, and by adding a part of silicon carbide in the form of ultrafine powder, the oxidation resistance and resistance to carbon can be improved. The hot metal property is improved more effectively.

  By using the slag bucket 60 which is the pouring receiving member of the present invention having the bottom portion (laying portion) 52 configured in this way, the melting of the laying portion 52 (especially the hot water contact portion 40) where the molten slag to be poured lands is obtained. The loss can be effectively suppressed. As a result, the durability of the slag bucket 60 can be increased. Moreover, since the hot water hitting part 40 uses magnesia-carbon bricks, it is possible to improve the wear resistance against hot metal and the corrosion resistance against slag. Therefore, the durability of the slag bucket 60 is further improved.

  In addition, although embodiment concerning this invention was described, the range of this invention is not limited to this, A various change is possible in the range which does not deviate from the summary of invention.

1: Tilt casting rod 2: Blast furnace 3: Large rod 4: Medium rod 5: Middle rod end outlet 6: Hot metal ladle
11: Hot metal discharge port 12: Tilt injection main body 13: Shell member bottom surface 14, 51: Shell member
20, 40: Hot water contact portion 21, 41: Inner bottom surface 22, 42: Outer bottom surface
30, 50: Castable layer 31: Inclined surface 32, 52: Laying portion
33, 34, 53, 54: Side wall part 60: Slag bucket

Claims (4)

A pouring receiving member having a base portion having a hot water receiving portion for receiving a high temperature fluid to be poured mainly formed by castable and a side wall portion extending from at least a part of a peripheral portion of the base portion,
The hot water receiving portion is composed of non-fired magnesia-carbon shaped bricks. The vertical cross-sectional shape of the unfired magnesia-carbon shaped brick is trapezoidal,
The molten metal receiving member according to claim 1, wherein the trapezoidal shape has a short side on one side in contact with the high-temperature fluid, and a long side on the other side opposite to the short side. A tiltable shallow container-like shell member having a hot metal discharge port at both ends, and a castable layer provided on the bottom side of the shell member,
The castable layer has a floor portion and a side wall portion extending from at least a part of a peripheral edge portion of the floor portion,
In the central region of the laying part, a hot water receiving part that receives a high-temperature fluid to be poured is an inclined pouring pad that is embedded integrally with the castable layer,
The hot water hitting part is composed of unfired magnesia-carbon shaped bricks. A deep-bottom vessel-shaped shell member and a castable layer provided on the inner surface side of the shell member;
The castable layer has a floor portion and a side wall portion extending from at least a part of a peripheral edge portion of the floor portion,
In the central region of the floor portion, a hot water receiving portion that receives a high-temperature fluid to be poured is a slag bucket that is embedded integrally with the castable layer,
The slag bucket, wherein the hot water contact portion is made of unfired magnesia-carbon shaped brick.

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