A dry vibrating aluminum-magnesium slag retaining wall and preparation method thereof

Abstract

The present invention discloses a dry-type vibrating aluminum-magnesium slag retaining wall and a preparation method, aiming to provide a dry-type vibrating aluminum-magnesium slag retaining wall and a preparation method which is in the form of a split combination and is simple and easy to manufacture, and can effectively remove impurities in molten steel and improve the purity of molten steel. It comprises an upper wall and a lower wall arranged below the upper wall, the side wall of the upper wall is provided with a steel flow hole penetrating the upper wall, the bottom of the upper wall is provided with a mounting block, the inner wall of the steel flow hole is provided with a plurality of slag retaining blocks, the lower wall is provided with a mounting surface and a stepped surface, the mounting surface is provided with a mounting groove, and the mounting block is connected to the mounting groove. The beneficial effects of the present invention are: it is manufactured and processed in the form of a split combination, which is simple and easy to manufacture, solves the difficulties in manufacturing the slag retaining wall as a whole, and improves the manufacturing efficiency; slows down the flow rate of molten steel, increases the residence time of molten steel, causes impurities to float, and improves the purity of molten steel.

Description

Technical Field

[0001] The present invention relates to the technical field related to refractory materials, and in particular to a dry vibrating aluminum-magnesium slag retaining wall and a preparation method thereof. Background Art

[0002] As an important basic raw material, steel plays a vital role in the economic development of countries around the world. In the process of producing various steel products in steel plants, there are two methods of using molten steel to solidify and form: traditional mold casting and continuous steel casting. The continuous casting technology that appeared in Europe and the United States in the 1950s is an advanced technology that directly casts molten steel into shape. Compared with traditional methods, continuous casting technology has significant advantages such as greatly improving metal recovery rate and billet quality, saving energy, etc. The tundish is a refractory container used in steelmaking. It first receives the molten steel poured from the ladle, and then distributes it to each crystallizer through the tundish water outlet.

[0003] The use of slag retaining walls in the tundish for continuous casting of molten steel can extend the residence time of molten steel in the tundish to a certain extent, allowing inclusions in the molten steel to gather and float up, thus purifying the molten steel. The complex slag retaining walls currently used are difficult to produce, and the slag retaining walls have a short blocking time for molten steel, and the floating speed of inclusions is slow, resulting in low purity of the molten steel. Therefore, a slag retaining wall that is simple to manufacture and can effectively improve the purity of molten steel is needed to improve the above problems. Summary of the invention

[0004] The present invention aims to overcome the shortcomings of the prior art that slag retaining walls are difficult to manufacture and have poor impurity removal effects, and provides a dry vibrating aluminum-magnesium slag retaining wall and a preparation method that is in a split combination form, simple and easy to manufacture, and can effectively remove impurities from molten steel and improve the purity of molten steel.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A dry vibrating aluminum-magnesium slag retaining wall comprises an upper wall and a lower wall arranged below the upper wall, the side wall of the upper wall is provided with a steel flow hole penetrating the upper wall, the bottom of the upper wall is provided with a mounting block, the inner wall of the steel flow hole is provided with a plurality of slag retaining blocks, the lower wall is provided with a mounting surface and a receiving surface, the mounting surface is provided with a mounting groove, and the mounting block is connected to the mounting groove.

[0007] The slag retaining wall includes an upper wall and a lower wall, and the upper wall is placed above the lower wall. A mounting block is provided at the bottom of the upper wall, and a mounting surface and a receiving surface are provided on the upper surface of the lower wall. A mounting groove is provided on the mounting surface, and the upper and lower walls are connected by the mounting block and the mounting groove. Dividing the slag retaining wall into two parts can facilitate the casting and forming of the slag retaining wall, making the structure of the slag retaining wall easier to realize. A steel flow hole is provided on the side wall of the upper wall, and the steel flow hole penetrates and connects the inner wall and the outer wall of the upper wall. A number of slag retaining blocks are provided on the inner wall of the steel flow hole, which can slow down the outflow speed of the molten steel, increase the time of the molten steel in the tundish, and be more conducive to the floating removal of impurities in the molten steel and the capture of debris, thereby improving the purity of the molten steel.

[0008] Preferably, the upper wall is an arc-shaped wall with a right-angled trapezoidal cross section. The inclined sidewall of the upper wall faces the direction of molten steel inflow. An air inlet is provided at the top of the upper wall, and a ventilation pipeline is provided inside. The ventilation pipeline is connected to the air inlet. The cross section of the upper wall is a right-angled trapezoid. The inclined surface of the upper wall faces the side where the molten steel is poured. The side of the upper wall that is perpendicular to the horizontal plane is the side where the molten steel is discharged. The inclined surface of the upper wall can increase the contact time between the molten steel and the slag retaining wall, which is beneficial to the floating of impurities in the molten steel. The air inlet provided at the top of the upper wall is connected to the ventilation pipeline provided inside. The air inlet can transport the external argon gas to the corresponding position through the ventilation pipeline, providing a transportation channel for the argon gas.

[0009] Preferably, the steel flow hole is tilted, the central axis of the steel flow hole forms an acute angle with the bottom surface of the upper wall, and the opening of the steel flow hole arranged on the inclined side wall of the upper wall is lower than the opening of the steel flow hole on the vertical side wall of the upper wall. The steel flow hole is tilted, and the opening of the steel flow hole on the inclined side wall of the upper wall is lower than the opening of the vertical side wall of the upper wall, so that when the molten steel is discharged outward through the steel flow hole, the contact time between the molten steel and the slag retaining wall can be increased compared with the horizontally arranged steel flow hole, so that the flow of the molten steel is slowed down, which is conducive to the floating of impurities in the molten steel and improves the purity of the molten steel.

[0010] Preferably, the slag stopping block is a semicircular block with a trapezoidal cross-section. The height of the slag stopping block is smaller than the radius of the steel flow hole. A second air permeable brick is arranged inside the slag stopping block. The cross-section of the second air permeable brick is a cross. One end face of the second air permeable brick is connected to the ventilation pipeline and the corresponding end face faces the central axis of the steel flow hole. The other end faces of the second air permeable brick are in contact with the outer surface of the slag stopping block. The height of the slag blocking block is smaller than the radius of the steel flow hole, which is beneficial to the passage of molten steel; the inclined side surface of the slag blocking block is arranged to provide guidance for the flow direction of the molten steel; the cross-section of the second air brick arranged in the slag blocking block is cross-shaped, and the end faces of the second air brick are in contact with and flush with the outer surface of the slag blocking block, and the second air brick is connected to the ventilation pipeline to ensure that the second air brick is in full contact with the molten steel flowing through. At the same time, the trapezoidal cross-section of the second air brick allows the molten steel to fully contact the slag blocking block when passing through the steel flow hole, and the argon gas discharged from the ventilation pipeline generates argon bubbles in the molten steel, and the argon bubbles collide with the impurities in the molten steel, promote the floating of impurities and capture and remove them, thereby improving the purity of the molten steel.

[0011] Preferably, the opening of the steel flow hole arranged on the upper wall inclined surface side wall is provided with a ceramic ring, the ceramic ring is sleeved with the steel flow hole, the end of the ceramic ring is provided with a flange edge, and the flange edge surface is in contact with the upper wall inclined surface side wall. The ceramic ring can prevent the impact force of the falling molten steel from being too large to damage the opening of the steel flow hole of the upper wall, and the ceramic ring can be made of boron nitride material to make the upper wall have better impact resistance.

[0012] Preferably, a reinforcing plate is arranged inside the upper wall, the reinforcing plate is close to the vertical side wall of the upper wall and is parallel to the outer side surface of the upper wall. The design of the reinforcing plate can ensure the strength of the upper wall and improve its impact resistance.

[0013] Preferably, the air inlet is externally connected to an air inlet pipe, and the air inlet pipe is externally connected to an air inlet pump. The external air inlet pump can make the argon gas entering the air inlet have a certain impact force, so that the argon gas fully collides with impurities in the molten steel and promotes the impurities to float up and be removed, thereby improving the purity of the molten steel.

[0014] Preferably, the receiving surface is stepped, and the horizontal surfaces of each layer of the receiving surface are connected by arc transition. The horizontal surface of the receiving surface is provided with a plurality of rectangular first air-permeable bricks, the top surface of the first air-permeable brick is flush with the horizontal surface, and the bottom surface is connected with the ventilation pipeline. The horizontal surface where the receiving surface is connected to the inclined side wall of the upper wall is the highest level, and the horizontal surface is connected to the inclined side wall of the upper wall by an arc transition. The receiving surface designed in the lower wall contacts with the molten steel for the first time, and the receiving surface is stepped, which can effectively alleviate the impact of the impact force on the inclined side wall of the upper wall during the falling process of the molten steel. A number of rectangular first air-permeable bricks are arranged on the horizontal surface of the receiving surface, and the lower end of the air-permeable brick is connected with the ventilation pipeline to ensure that the argon gas entering the ventilation pipeline can be discharged through the first air-permeable brick and enter the molten steel, fully collide with the impurities in the molten steel, and promote the floating and removal of impurities; the arc transition connection between the layers of the receiving surface ensures the smooth flow of the molten steel and avoids the formation of dead water areas; the highest layer of the receiving surface is tangentially connected to the inclined side wall of the upper wall, effectively guiding the molten steel on the lower wall upward, changing the flow direction of the molten steel, removing the bottom impurities, and shortening the floating time of the impurities, which is beneficial to improving the purity of the molten steel.

[0015] Preferably, the cross section of the installation groove is an inverted T-shape, the cross section of the installation block is an I-shape, the upper end of the installation block is connected to the upper wall, and the lower end is matched and connected to the installation groove. The installation groove is a through groove with a certain arc and an inverted T-shaped cross section. The installation groove penetrates the two side end faces of the lower wall. When the upper wall is cast, the installation block is connected to the upper wall. The cross section of the installation block is an I-shape, and the cross section of the installation block is matched with the inverted T-shaped size of the cross section of the installation groove. The installation block can slide into the installation groove from one side of the installation groove to achieve a matched connection with the installation groove, ensuring the connection stability between the upper wall and the lower wall. At the same time, it adopts a split combination form, which is simple and easy, avoiding the difficulty of making an integral slag retaining wall and improving the production efficiency.

[0016] A method for preparing a dry vibrating aluminum-magnesium slag retaining wall, the steps are as follows:

[0017] 1) Prepare a mixture by mixing aggregates with additives to obtain a dry vibrating magnesium-aluminum mixture that meets the requirements;

[0018] 2) Casting of the lower wall: placing the membrane of the lower wall on the casting platform, placing the second air-permeable brick at the corresponding position of the membrane, pouring the mixture into the membrane of the lower wall, letting it stand, demoulding, and firing;

[0019] 3) Casting of the upper wall: Place the membrane of the upper wall on the casting platform, place the first air-permeable brick at the corresponding position of the membrane, place the mounting block at the bottom of the membrane, place the reinforcing plate near the outer wall of the membrane, cast the mixture into the membrane of the upper wall, let it stand, demould, and fire;

[0020] 4) Install the reinforcement, put the ceramic ring into the flow steel hole, and make the flange surface of the ceramic ring contact with the upper wall;

[0021] 5) Assemble the upper and lower walls. Install the mounting block of the upper wall into the mounting groove of the lower wall to complete the assembly of the upper and lower walls.

[0022] The beneficial effects of the present invention are as follows: the overall slag retaining wall is manufactured and processed in the form of a split assembly, which is simple and easy, solves the difficulty of manufacturing the slag retaining wall as a whole, and improves the manufacturing efficiency; the design of the related structure of the receiving surface alleviates the impact force of the falling molten steel, increases the residence time of the molten steel, and effectively improves the purity of the molten steel; the design of the slag retaining block arranged upward and inside the steel flow hole is conducive to slowing down the flow rate of the molten steel, increasing the residence time of the molten steel, and facilitating the floating of impurities in the molten steel, effectively improving the purity of the molten steel; the air-permeable bricks arranged inside the slag retaining block and on the receiving surface inject external argon gas into the molten steel, so that the argon bubbles collide with the impurities and improve the purity of the molten steel. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is an overall stereogram of the present invention;

[0024] Figure 2 is a cross-sectional view of the present invention;

[0025] Figure 3 This is a top view of the lower wall.

[0026] In the accompanying drawings,

[0027] 1. Upper wall, 2. Lower wall, 3. Steel flow hole, 4. Mounting block, 10. Air inlet hole, 11. Ventilation pipeline, 12. Reinforcement plate, 13. Air inlet pipe, 20. Mounting surface, 21. Supporting surface, 22. Mounting groove, 23. First air brick, 30. Slag block, 31. Second air brick, 32. Ceramic ring. DETAILED DESCRIPTION

[0028] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0029] Embodiment 1,

[0030] like Figure 1-3 As shown, a dry vibrating aluminum-magnesium slag retaining wall includes an upper wall 1 and a lower wall 2 arranged below the upper wall 1. The side wall of the upper wall 1 is provided with a steel flow hole 3 penetrating the upper wall 1. A mounting block 4 is provided at the bottom of the upper wall 1. A plurality of slag retaining blocks 30 are provided on the inner wall of the steel flow hole 3. The lower wall 2 is provided with a mounting surface 20 and a receiving surface 21. The mounting surface 20 is provided with a mounting groove 22. The mounting block 4 is connected to the mounting groove 22.

[0031] like Figure 1 , 2As shown, the upper wall 1 is an arc-shaped wall with a right-angled trapezoidal cross section. The inclined side wall of the upper wall 1 faces the direction of molten steel inflow. An air inlet 10 is arranged at the top of the upper wall 1, and a ventilation pipe 11 is arranged inside. The ventilation pipe 11 is connected to the air inlet 10. The steel flow hole 3 is arranged at an angle. The central axis of the steel flow hole 3 forms an acute angle with the bottom surface of the upper wall 1. The orifice of the steel flow hole 3 arranged on the inclined side wall of the upper wall 1 is lower than the orifice of the steel flow hole 3 on the vertical side wall of the upper wall 1. The slag blocking block 30 is a semicircular block with a trapezoidal cross section. The height of the slag blocking block 30 is less than the radius of the steel flow hole 3. A second air brick 31 is arranged in the slag blocking block 30. The cross section of the second air brick 31 is a cross. One end face of the second air brick 31 is connected to the ventilation pipe 11, and the corresponding end face faces the central axis of the steel flow hole 3. The other end faces of the second air brick 31 are in contact with the outer surface of the slag blocking block 30. A ceramic ring 32 is provided at the opening of the steel flow hole 3 provided on the inclined side wall of the upper wall 1. The ceramic ring 32 is sleeved with the steel flow hole 3. A flange edge is provided at the end of the ceramic ring 32, and the flange edge surface is in contact with the inclined side wall of the upper wall 1. A reinforcing plate 12 is provided inside the upper wall 1. The reinforcing plate 12 is close to the vertical side wall of the upper wall 1 and is parallel to the vertical side wall of the upper wall 1. The air inlet 10 is externally connected to the air inlet pipe 13. The air inlet pipe 13 is externally connected to the air inlet pump.

[0032] like Figure 3 As shown, the receiving surface 21 is in a step shape. The horizontal planes of each layer of the receiving surface 21 are connected by a circular arc transition. The horizontal plane of the receiving surface 21 is provided with a plurality of rectangular first air bricks 23. The top surface of the first air brick 23 is flush with the horizontal plane, and the bottom surface is connected to the ventilation pipe 11. The horizontal plane where the receiving surface 21 is connected to the inclined side wall of the upper wall 1 is the highest level, and the horizontal plane is connected to the inclined side wall of the upper wall 1 by a circular arc transition. The cross section of the mounting groove 22 is an inverted T-shape. The cross section of the mounting block 4 is an I-shape. The upper end of the mounting block 4 is connected to the upper wall 1, and the lower end is matched and connected to the mounting groove 22.

[0033] A method for preparing a dry vibrating aluminum-magnesium slag retaining wall, such as Figure 1-3 As shown, the steps are as follows:

[0034] 1) Prepare a mixture by mixing aggregates with additives to obtain a dry vibrating magnesium-aluminum mixture that meets the requirements.

[0035] 2) Casting of the lower wall: placing the membrane of the lower wall 2 on the casting platform, placing the first air-permeable brick 23 at the corresponding position of the membrane, casting the mixture into the membrane of the lower wall 2, letting it stand, demoulding, and firing.

[0036] 3) Casting of the upper wall: Place the membrane of the upper wall 1 on the casting platform, place the second air-permeable brick 31 at the corresponding position of the membrane, place the mounting block 4 at the bottom of the membrane, place the reinforcing plate 12 near the outer wall of the membrane, cast the mixture into the membrane of the upper wall 1, let it stand, demould, and fire.

[0037] 4) Install the reinforcement member, sleeve the ceramic ring 32 into the flow steel hole 3, and make the flange surface of the ceramic ring 32 contact the upper wall 1.

[0038] The upper and lower walls are assembled together, and the mounting block 4 of the upper wall 1 is installed into the mounting groove 22 of the lower wall 2 to complete the assembly of the upper and lower walls.

Claims

1. A dry vibrating aluminum-magnesium slag retaining wall, characterized in that: The invention comprises an upper wall (1) and a lower wall (2) arranged below the upper wall (1), wherein the side wall of the upper wall (1) is provided with a steel flow hole (3) penetrating the upper wall (1), a mounting block (4) is provided at the bottom of the upper wall (1), a plurality of slag blocking blocks (30) are provided on the inner wall of the steel flow hole (3), the lower wall (2) is provided with a mounting surface (20) and a receiving surface (21), the mounting surface (20) is provided with a mounting groove (22), the mounting block (4) is connected to the mounting groove (22), and the The upper wall (1) is an arc-shaped wall with a right-angled trapezoidal cross section. The inclined side wall of the upper wall (1) faces the direction of molten steel inflow. An air inlet (10) is arranged at the top of the upper wall (1) and a ventilation pipeline (11) is arranged inside the upper wall (1). The ventilation pipeline (11) is connected to the air inlet (10). The steel flow hole (3) is arranged obliquely. The central axis of the steel flow hole (3) forms an acute angle with the bottom surface of the upper wall (1). The opening of the steel flow hole (3) arranged on the inclined side wall of the upper wall (1) is low. The slag blocking block (30) is a semicircular block with a trapezoidal cross section at the opening of the steel flow hole (3) on the vertical side wall of the upper wall (1). The height of the slag blocking block (30) is less than the radius of the steel flow hole (3). A second air-permeable brick (31) is arranged inside the slag blocking block (30). The cross section of the second air-permeable brick (31) is cross-shaped. One end face of the second air-permeable brick (31) is connected to the ventilation pipeline (11) and the corresponding end face faces the central axis of the steel flow hole (3). The other end faces of the second air-permeable brick (31) are connected to the slag blocking block. (30) is in contact with the outer surface, the receiving surface (21) is in a step shape, and the horizontal surfaces of each layer of the receiving surface (21) are connected by arc transitions. The horizontal surface of the receiving surface (21) is provided with a plurality of rectangular first air-permeable bricks (23), the top surface of the first air-permeable bricks (23) is flush with the horizontal surface, and the bottom surface is connected to the ventilation pipeline (11), and the horizontal surface where the receiving surface (21) is connected to the inclined side wall of the upper wall (1) is the highest level, and the horizontal surface is connected to the inclined side wall of the upper wall (1) by an arc transition.

2. The dry vibrating aluminum-magnesium slag retaining wall according to claim 1 is characterized in that: The opening of the steel flow hole (3) arranged on the inclined side wall of the upper wall (1) is provided with a ceramic ring (32), the ceramic ring (32) is sleeved with the steel flow hole (3), and the end of the ceramic ring (32) is provided with a flange edge, and the flange edge surface is in contact with the inclined side wall of the upper wall (1).

3. The dry vibrating aluminum-magnesium slag retaining wall according to claim 1 is characterized in that: A reinforcing plate (12) is arranged inside the upper wall (1), and the reinforcing plate (12) is close to the vertical side wall of the upper wall (1) and parallel to the vertical side wall of the upper wall (1).

4. The dry vibrating aluminum-magnesium slag retaining wall according to claim 1 is characterized in that: The air inlet (10) is externally connected to an air inlet pipe (13), and the air inlet pipe (13) is externally connected to an air inlet pump.

5. The dry vibrating aluminum-magnesium slag retaining wall according to claim 1 is characterized in that: The cross section of the mounting groove (22) is an inverted T-shape, the cross section of the mounting block (4) is an I-shape, the upper end of the mounting block (4) is connected to the upper wall (1), and the lower end is matched and connected to the mounting groove (22).

6. The method for preparing a dry vibrating aluminum-magnesium slag retaining wall according to claim 1, characterized in that the steps as follows: Making a mixture, mixing aggregates with additives to obtain a dry vibrating magnesium-aluminum mixture that meets the requirements; Casting the lower wall, placing the membrane of the lower wall (2) on a casting platform, placing the first air-permeable brick (23) at a corresponding position of the membrane, casting the mixture into the membrane of the lower wall (2), letting it stand, demoulding, and firing; Casting the upper wall; placing the membrane of the upper wall (1) on a casting platform, placing the second air-permeable brick (31) at a corresponding position of the membrane, placing a mounting block (4) at the bottom of the membrane, placing a reinforcing plate (12) near the outer wall of the membrane, casting the mixture into the membrane of the upper wall (1), letting it stand, demoulding, and firing; The reinforcement member is installed, and the ceramic ring (32) is sleeved into the flow steel hole (3) so that the flange surface of the ceramic ring (32) is aligned with the upper wall (1); The upper and lower walls are assembled together, and the mounting block (4) of the upper wall (1) is installed into the mounting groove (22) of the lower wall (2), thereby completing the assembly of the upper and lower walls.

Images