Method for replacing center brick of hot-metal bottle with spherical bottom

Abstract

The invention discloses a spherical bottom hot-metal bottle center brick replacement method. The method comprises the following steps that an original center brick in a bottom center area is smashed and taken out; crushing and taking out a permanent layer material at the bottom of the original central brick, and cleaning residues, residual iron and residual ash in the central area of the bottom; high-aluminum castable is poured at the permanent layer part at the bottom of the original center brick, the pouring height of the high-aluminum castable is flush with the permanent layer which is not excavated and repaired at the joint part, and the high-aluminum castable is cured and initially set; a new center brick is taken, at least one center brick is cut, the periphery of the cut brick and the periphery of the complete center brick are coated with alumina-magnesia-carbon daub, the bottom center area is filled with the alumina-magnesia-carbon daub, it is ensured that gaps between all the bricks and gaps between the bricks and a non-excavated and repaired working layer of the joint position do not exceed 1 mm, and the overall working face and the peripheral surface of the bottom center area are flat; and baking after curing. The method provided by the invention realizes patching of the circular-truncated-cone-shaped center brick, and is simple, high in repairing efficiency, low in cost and long in service life after repairing.

Description

Technical Field

[0001] The invention relates to the technical field of refractory materials for molten iron tanks, and in particular to a method for replacing a central brick of a spherical bottom molten iron tank. Background Art

[0002] In iron and steel metallurgy, the molten iron tank is an important container for molten iron transportation and pretreatment. The spherical bottom is a shape structure of the molten iron tank. The advantage is that the non-working surface size of the bottom working layer brick is larger than the corresponding size of the working surface, and the overall withdrawal phenomenon will not occur under the effect of thermal expansion and contraction. The bottom working layer is generally built by first laying the truncated cone-shaped center brick, and then the other bottom bricks are built in a circular manner around the center brick. Because the center brick is too large, it is generally composed of four identical bricks.

[0003] With the advancement of smelting technology, the central area of ​​the bottom of some steel plants has been increasingly eroded and corroded by molten iron, and cannot reach the life matching the working lining of other areas, so it needs to be repaired and maintained in the middle of use. There are currently two common bottom maintenance methods: the first is to clean the residual iron at the bottom and directly use matching castables for pouring and repairing; the second is to clean the residual iron at the bottom and place several erosion-resistant high-aluminum brick products near the impact point in the central area, and then cover the high-aluminum bricks with matching castables, and then use them after curing and baking. The above two methods have a low service life after each maintenance, and multiple pouring and repairing are required to achieve the goal of matching the life of the working lining bricks. In addition, each construction requires curing and baking for at least 24 hours before it can be used. The repair cycle is too long, which affects the turnover of the molten iron tank.

[0004] Therefore, it is urgent to develop a repair method with low cost and long service life after repair to realize the repair and maintenance of the center brick. Summary of the invention

[0005] In order to overcome the shortcomings of the above-mentioned technology, the purpose of the present invention is to provide a method for replacing the center bricks of a spherical bottom iron water tank, which can realize the excavation and patching of the center bricks of the spherical bottom iron water tank, and solve the problems of high maintenance and repair costs of the center bricks and short service life after maintenance and repair.

[0006] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0007] A method for replacing the central bricks of a spherical bottom iron ladle, wherein the iron ladle is composed of an outer shell, a permanent layer and a working layer from the outside to the inside, and the working layer in the central area of ​​the bottom of the iron ladle is built with central bricks; the central bricks form a truncated cone structure in the central area of ​​the bottom, and the replacement method comprises the following steps:

[0008] 1) Break and remove the original center brick in the center area of ​​the bottom;

[0009] 2) Break up the permanent layer of material at the bottom of the original center brick and remove it, and clean up the residue, iron residue and ash in the center area of ​​the bottom;

[0010] 3) Pour high-aluminum castables into the permanent layer at the bottom of the original center brick. The pouring height should be level with the permanent layer at the joint part that has not been excavated and repaired. Curing should be carried out for at least 8 hours and initial setting should be achieved.

[0011] 4) Take a new center brick, cut at least one of the center bricks, apply aluminum-magnesium-carbon mortar around the cut bricks and the complete center bricks, and fill them into the bottom center area, ensuring that the gaps between the bricks and between the bricks and the unrepaired working layers of the joints filled with aluminum-magnesium-carbon mortar do not exceed 1 mm, and the overall working surface of the bottom center area and the surrounding surfaces are flat;

[0012] 5) Bake after curing.

[0013] Furthermore, the center brick is a 1 / 4 truncated cone brick, the top and bottom surfaces of the center brick are fan-shaped surfaces, and the fan-shaped radius of the bottom surface is larger than the fan-shaped radius of the top surface; four center bricks can be spliced ​​into a truncated cone structure.

[0014] As a preferred embodiment, the high-alumina castable in step 3) is a high-alumina castable combined with calcium aluminate cement.

[0015] Furthermore, in the high-aluminum castable, the content of Al2O3 is 45-95%. The Al2O3 content needs to be at least 45% to ensure the refractoriness, mechanical properties and thermal shock resistance of the castable.

[0016] Furthermore, in step 3), before pouring the high-aluminum castable, water is added to the high-aluminum castable, and pouring is performed after stirring and mixing, and the surface of the castable is patted and flattened after pouring; wherein the weight of the water is 5-7% of the weight of the high-aluminum castable.

[0017] As a preferred solution, in step 4), at least two of the center bricks are cut to form at least one rectangular parallelepiped brick. Since the working layer portion of the bottom center area is a truncated cone structure, the bottom diameter is larger than the top, and a complete center brick cannot be directly filled in, so the center brick needs to be cut and filled in. To avoid the situation where the center brick cannot be filled in after cutting, it is ensured that there is at least one rectangular parallelepiped brick among the bricks to be filled in, which can be directly inserted into the bottom center area to achieve the replacement of the center brick.

[0018] Furthermore, the rectangular parallelepiped brick is filled into the bottom center area last.

[0019] Furthermore, in step 4), after the cut bricks and the complete center bricks coated with aluminum-magnesium-carbon mortar are filled into the bottom center area, the gaps are filled with aluminum-magnesium-carbon mortar to form an aluminum-magnesium-carbon mortar layer, and the gaps between the bricks, i.e., the thickness of the aluminum-magnesium-carbon mortar layer, does not exceed 1 mm. When applying the aluminum-magnesium-carbon mortar, the coating thickness is 0.5 to 1.5 mm.

[0020] Furthermore, the step 4) comprises:

[0021] Take a central brick and cut it with a surface parallel to any trapezoidal side surface as a first cutting surface to obtain a first irregular fan-shaped brick and a first brick, wherein the first brick is an irregular rectangular parallelepiped brick with a curved surface;

[0022] Take the first irregular sector-shaped brick and cut it along the second cutting surface to obtain a second irregular sector-shaped brick and a second brick, the second cutting surface is perpendicular to the first cutting surface and the sector-shaped surface of the center brick, and the second brick is an irregular rectangular parallelepiped brick with a curved surface; take the second irregular sector-shaped brick and cut it to obtain a third brick, and the third brick is a rectangular parallelepiped brick;

[0023] Taking another central brick, cutting it along a surface parallel to the first cutting surface to obtain a fourth brick, wherein the fourth brick is an irregular fan-shaped brick;

[0024] Taking another central brick, cutting it along a surface parallel to the second cutting surface to obtain a fifth brick, wherein the fifth brick is an irregular fan-shaped brick;

[0025] Apply aluminum-magnesium-carbon mortar all around the first brick, the second brick, the third brick, the fourth brick, the fifth brick and two complete center bricks, and then fill in the center brick area; among them, the first brick and the fourth brick are spliced ​​into the shape of a center brick, and the second brick, the third brick and the fifth brick are spliced ​​into the shape of a center brick.

[0026] Furthermore, during the cutting process of the fourth brick, the width of the cut portion thereof is not less than the width of the first brick, and the difference between the two widths is not greater than 1 mm;

[0027] During the cutting process of the fifth brick, the width of the cut part is not less than the width of the second brick and the length of one side of the third brick, and the difference between the width of the cut part and the width of the second brick and the length of the side of the third brick is no more than 1mm; the other side of the third brick is smaller than the total width of the first brick and the loss of the cut brick body during the cutting process, and the difference is no more than 1mm.

[0028] Furthermore, the cutting portions of the fourth brick and the fifth brick have the same width.

[0029] During the cutting process, each cut will lose 4 to 6 mm of width. The loss is too large. If all of it is filled with aluminum-magnesium-carbon mortar, the strength will be too low, affecting the service life of the repaired molten iron tank. Through the precise design of the cutting and splicing dimensions of multiple center bricks, the gap between the center bricks is maintained at no more than 1 mm. By cutting multiple center bricks and splicing the cut parts of different center bricks, the problem of too large gaps after splicing due to the loss of the cut bricks during the cutting process can be avoided. The above cutting method can effectively maintain the gap between the bricks to be patched below 1 mm. After the center bricks are spliced, the deviation from the original center brick is less than 1 mm. At the same time, it solves the problem that the center brick is small on the top and large on the bottom and cannot be patched.

[0030] Furthermore, the radius of the sector surface of the central brick 6 is 200-250 mm.

[0031] Furthermore, in step 4), during the cutting process of preparing the fourth brick and the fifth brick, the width of the cut portion is 50-60 mm. When it is less than 50 mm, the strength of the first brick and the second brick is too low and they are easy to break during the splicing process. When it is greater than 60 mm, the fourth brick and the fifth brick are too small and difficult to splice.

[0032] As a preferred solution, in the aluminum-magnesium-carbon mortar in step 5), the Al2O3 content is 50-80%, the MgO content is 5-15%, and the C content is 5-15%. In the aluminum-magnesium-carbon mortar, when the MgO content is less than 5%, the aluminum-magnesium-carbon mortar will not expand significantly, and when it exceeds 15%, the expansion is too large, which affects the splicing of bricks, so the MgO content is selected to be 5-15%. When the C content is less than 5%, the aluminum-magnesium-carbon mortar cannot effectively resist penetration, and when it exceeds 15%, its strength is too low, affecting the service life after repair.

[0033] Furthermore, in step 5), the aluminum-magnesium-carbon mortar is mixed with water before applying the aluminum-magnesium-carbon mortar, and is stirred into a slurry state in a mixer before construction can be carried out; the weight of the water is 25-45% of the weight of the aluminum-magnesium-carbon mortar.

[0034] As a preferred embodiment, in step 5), the curing time is 8 to 24 hours.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] The invention realizes the digging and patching of the truncated cone-shaped center brick, and the method is simple, the patching efficiency is high, the cost is low, and the service life after the patching is long.

[0037] The cutting method used in the present invention effectively solves the problem of excessive gaps caused by loss during the cutting process, avoids the phenomenon of molten iron infiltrating along the gaps of the center bricks due to the replacement of the center bricks, and greatly improves the safety of the operation of the molten iron tank; when the present invention digs and repairs the center brick, the permanent layer below the center brick is removed together, and the castable is re-tied, which plays a supporting role for the center brick and prevents the displacement of the center brick after the digging and repair during use; the present invention uses aluminum-magnesium-carbon mortar to fill the brick joints. On the one hand, the addition of carbon can effectively improve the resistance of the brick joints to erosion and permeability of molten iron, and on the other hand, aluminum oxide and magnesium oxide react at high temperature to produce spinel to produce a certain expansion, which can further fill the brick joints and prevent iron seepage. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 , Figure 2 , Figure 3 This is a schematic diagram of cutting a center brick in an embodiment;

[0039] Figure 4 This is a schematic diagram of assembling the center brick after cutting in the embodiment;

[0040] Figure 5 It is a cross-sectional schematic diagram of the center brick of the bottom of the molten iron tank after the center brick of the spherical bottom molten iron tank in the embodiment is replaced;

[0041] Markings in the figure: 1. The first brick; 2. The second brick; 3. The third brick; 4. The fourth brick; 5. The fifth brick; 6. The center brick; 8. The loss of brick cutting; 9. The aluminum-magnesium-carbon mortar layer; 10. The bottom center area; 11. The bottom center permanent layer; 12. The annular area; 13. The un-excavated permanent layer. DETAILED DESCRIPTION

[0042] In order to better explain the present invention, the main content of the present invention is further explained below in combination with specific embodiments, but the content of the present invention is not limited to the following embodiments. The "width" mentioned herein is the distance between two parallel lines on the top surface of the brick body or two parallel surfaces of the brick body.

[0043] Example 1

[0044] like Figure 5As shown, the wall of the spherical bottom molten iron ladle is composed of the molten iron ladle shell, the permanent layer and the working layer from the outside to the inside. The working layer of the bottom of the molten iron ladle is composed of the bottom central area 10 and the annular area 12. The working layer of the bottom central area 10 is a truncated cone structure, which is spliced ​​by four identical center bricks 6. The center brick 6 is paved with fan-shaped bricks around, and the fan-shaped bricks are laid into the annular area 12 by the circular masonry method. The center brick 6 is a 1 / 4 truncated cone brick, and the top and bottom surfaces of the center brick 6 are fan-shaped surfaces, and the fan-shaped radius of the bottom surface is larger than the fan-shaped radius of the top surface. The structure of the bottom of the molten iron ladle is the prior art. Because the bottom central area 10 is subjected to the scouring and erosion of molten iron for a long time, it cannot reach the life matching the working lining of other areas, and needs to be repaired and maintained.

[0045] The method for replacing the central brick of a spherical bottom molten iron tank of the present invention is used to maintain the central area 10 of the bottom of the molten iron tank, and the steps are as follows:

[0046] 1) If Figure 5 As shown, the original center brick in the center area 10 of the bottom of the spherical bottom iron ladle is broken and removed manually with a pneumatic pick, and the bottom bricks in the annular area 12 around the center brick must not be damaged;

[0047] 2) Use a pneumatic pick to manually break up and remove the original permanent layer material below the bottom center area 10, and clean up the residue, residual iron and residual ash in the bottom center area 10;

[0048] 3) A layer of high-aluminum castable material combined with calcium aluminate cement with an aluminum oxide content of 45% is poured on the original permanent layer below the bottom center area 10 to form a maintained bottom center permanent layer 11. The amount of water added during construction is 7% of the weight of the high-aluminum castable material. The high-aluminum castable material and water are mixed in a mixer before pouring. After pouring, the surface of the castable is flattened with a shovel so that the height of the bottom center permanent layer 11 is level with the permanent layer 13 of the connecting part that has not been excavated. The next step can be performed after curing for 8 hours and initial setting;

[0049] 4) Take five center bricks 6 and cut three of them; the radius of the top sector surface of the center brick 6 is 200 mm, and the radius of the bottom sector surface is 250 mm.

[0050] like Figure 1As shown, a central brick 6 is cut along a first cutting plane parallel to a trapezoidal side of the central brick 6 to obtain a first brick 1, which is an irregular rectangular parallelepiped brick with a curved surface; the remaining irregular sector is cut along a second cutting plane to obtain a second brick 2, the second cutting plane is perpendicular to the first cutting plane and the sector of the central brick 6, and the second brick 2 is an irregular rectangular parallelepiped brick with a curved surface; finally, the remaining part is cut to obtain a third brick 3, which is a rectangular parallelepiped brick. The width of the first brick 1 is 49 mm, the width of the second brick 2 is 49 mm, and the width and length of the third brick 3 are 49 mm and 53 mm respectively.

[0051] like Figure 2 As shown, a central brick 6 is cut along a plane parallel to the first cutting plane to obtain a fourth brick 4, the fourth brick 4 is an irregular fan-shaped brick, and the width of the cut part is 50mm. There is a loss 8 of the cut brick body during the cutting process.

[0052] like Figure 3 As shown, a central brick 6 is cut along a plane parallel to the second cutting plane to obtain a fifth brick 5, wherein the fifth brick 5 is an irregular fan-shaped brick with a cut-off width of 50 mm. There is a loss 8 of the cut brick body during the cutting process.

[0053] The width of the cut brick loss 8 is 5mm.

[0054] Aluminum-magnesium-carbon mortar is applied around the fifth brick 5, the fourth brick 4, the first brick 1, the second brick 2, the third brick 3 and the two center bricks 6 to form an aluminum-magnesium-carbon mortar layer 9 between the brick joints. The composition of the aluminum-magnesium-carbon mortar is: Al2O3 content is 50%, MgO content is 15%, C content is 15%, and the amount of water added during construction is 32% of the weight of the aluminum-magnesium-carbon mortar.

[0055] Fill the bricks coated with aluminum-magnesium-carbon mortar into the bottom center area 10, ensuring that the thickness of each gap, i.e., the aluminum-magnesium-carbon mortar layer 9, after the bricks are assembled does not exceed 1 mm, and the overall working surface and surrounding surfaces of the working layer are flat; Figure 4 As shown, a fifth brick 5, a second brick 2 and a third brick 3 are filled into the central brick area and assembled into the shape of a central brick 6, and a fourth brick 4 and the first brick 1 are filled into the central brick area and assembled into the shape of a central brick 6, wherein the third brick 3 is the last one to be filled into the central brick area.

[0056] 5) After curing for 8 hours, bake and set aside.

[0057] Example 2

[0058] The repairing method of this embodiment is substantially the same as that of embodiment 1, except that:

[0059] In step 3), the alumina content in the high-alumina castable is 60%, the amount of water added during the construction of the high-alumina castable is 6% of the weight of the high-alumina castable, and the curing time is 12 hours.

[0060] In step 4), during the cutting process of preparing the fifth brick 5 and the fourth brick 4, the width of the cut part is 60 mm; the width of the first brick 1 is 59 mm, the width of the second brick 2 is 59 mm, and the width and length of the third brick 3 are 59 mm and 63 mm respectively.

[0061] The composition of aluminum-magnesium-carbon mortar is: Al2O3 content is 80%, MgO content is 5%, C content is 5%, and the amount of water added during construction is 28% of the weight of the aluminum-magnesium-carbon mortar.

[0062] In step 6), the health-preserving time is 12 hours.

[0063] Example 3

[0064] The repairing method of this embodiment is substantially the same as that of embodiment 1, except that:

[0065] In step 3), the alumina content in the high-alumina castable is 95%, the amount of water added during the construction of the high-alumina castable is 5% of the weight of the high-alumina castable, and the curing time is 24 hours.

[0066] In step 4), during the cutting process of preparing the fifth brick 5 and the fourth brick 4, the width of the cut part is 50 mm; the width of the first brick 1 is 49.5 mm, the width of the second brick 2 is 49.5 mm, and the width and length of the third brick 3 are 49.5 mm and 53.5 mm respectively. The composition of the aluminum-magnesium-carbon mortar is: Al2O3 content is 70%, MgO content is 8%, C content is 8%, and the amount of water added during construction is 28% of the weight of the aluminum-magnesium-carbon mortar.

[0067] In step 5), the maintenance time is 24 hours.

[0068] Example 4

[0069] The repairing method of this embodiment is substantially the same as that of embodiment 1, except that:

[0070] In step 3), the alumina content in the high-alumina castable is 65%, and the amount of water added during the construction of the high-alumina castable is 6.5% of the weight of the high-alumina castable.

[0071] In step 4), during the cutting process of preparing the fifth brick 5 and the fourth brick 4, the width of the cut part is 55mm; the width of the first brick 1 is 54mm, the width of the second brick 2 is 54mm, and the width and length of the third brick 3 are 54mm and 58mm respectively. The composition of the aluminum-magnesium-carbon mortar is: Al2O3 content is 60%, MgO content is 12%, C content is 12%, and the amount of water added during construction is 32% of the weight of the aluminum-magnesium-carbon mortar.

[0072] In step 5), the curing time is 18 hours.

[0073] Example 5

[0074] The repairing method of this embodiment is substantially the same as that of embodiment 1, except that:

[0075] In step 3), the alumina content in the high-alumina castable is 75%, and the amount of water added during the construction of the high-alumina castable is 5.5% of the weight of the high-alumina castable.

[0076] In step 4), during the cutting process of preparing the fifth brick 5 and the fourth brick 4, the width of the cut portion is 51 mm; the width of the first brick 1 is 50 mm, the width of the second brick 2 is 50 mm, and the width and length of the third brick 3 are 50 mm and 54 mm respectively. The composition of the aluminum-magnesium-carbon mortar is: Al2O3 content is 55%, MgO content is 13%, C content is 13%, and the amount of water added during construction is 37% of the weight of the aluminum-magnesium-carbon mortar.

[0077] In step 5), the curing time is 16 hours.

[0078] The use effect and cost of the spherical bottom iron ladle after repair in the above embodiments 1 to 5 are shown in Table 1.

[0079] Table 1: Service life of the central area 10 of the bottom of the spherical bottom iron ladle after repair in Examples 1 to 5

[0080] Average service life, furnace Cost, yuan / time Example 1 620 1000 Example 2 650 1100 Example 3 750 1200 Example 4 640 1050 Example 5 690 1150 Conventional castable repair 240 4000 High alumina brick composite castable repair 400 5000

[0081] As can be seen from Table 1, the cost of the repair method designed by the present invention is less than 1 / 3 of that of ordinary pouring repair, and the service life of the center area of ​​the bottom after maintenance is more than 1.5 times that of ordinary pouring repair. It can be seen that the digging and patching method designed by the present invention is conducive to improving the service life of the bottom of the molten iron tank after repair, and the cost of using the method of the present invention is lower than that of conventional castable repair and high-aluminum brick composite castable repair.

[0082] The above embodiments are only the best examples, and are not intended to limit the implementation of the present invention. In addition to the above embodiments, the present invention has other implementations. Any technical solution formed by equivalent replacement or equivalent transformation falls within the protection scope required by the present invention. Other parts not described belong to the prior art.

Claims

1. A method for replacing the center bricks of a spherical bottom iron ladle, wherein the iron ladle is composed of an outer shell, a permanent layer and a working layer from the outside to the inside, and the working layer in the central area of ​​the bottom of the iron ladle is built by center bricks; the center bricks form a truncated cone structure in the central area of ​​the bottom, characterized in that: The replacement method comprises the following steps: 1) Break and remove the original center brick in the center area of ​​the bottom; 2) Break up the permanent layer of material at the bottom of the original center brick and remove it, and clean up the residue, iron residue and ash in the center area of ​​the bottom; 3) Pour high-alumina castables into the permanent layer at the bottom of the original center brick, with the pouring height being level with the permanent layer at the joint part that has not been excavated and repaired, and allow it to cure and initially set; 4) Take a new center brick, cut at least one of the center bricks, apply aluminum-magnesium-carbon mortar around the cut bricks and the complete center bricks, and fill them into the bottom center area, ensuring that the gaps between the bricks and between the bricks and the unrepaired working layers of the joints filled with aluminum-magnesium-carbon mortar do not exceed 1 mm, and the overall working surface of the bottom center area and the surrounding surfaces are flat; 5) Bake after curing.

2. The method for replacing the center brick of a spherical bottom iron water tank according to claim 1, characterized in that: The center brick is a 1 / 4 truncated cone brick, the top and bottom surfaces of the center brick are fan-shaped surfaces, and the fan-shaped radius of the bottom surface is larger than the fan-shaped radius of the top surface; four center bricks can be spliced ​​into a truncated cone structure.

3. The method for replacing the center brick of a spherical bottom iron ladle according to claim 1, characterized in that: The high-alumina castable in step 3) is a high-alumina castable combined with calcium aluminate cement.

4. The method for replacing the center brick of a spherical bottom molten iron tank according to claim 3, characterized in that: The content of Al2O3 in the high-aluminum castable is 45-95%.

5. The method for replacing the center brick of a spherical bottom molten iron tank according to claim 4, characterized in that: In step 3), before pouring the high-aluminum castable, water is added to the high-aluminum castable, and pouring is performed after stirring and mixing. After pouring, the surface of the castable is patted and made flat; wherein the weight of the water is 5-7% of the weight of the high-aluminum castable.

6. The method for replacing the center brick of a spherical bottom iron water tank according to claim 2, characterized in that: In step 4), at least two of the center bricks are cut to form at least one rectangular parallelepiped brick.

7. The method for replacing the center brick of a spherical bottom iron water tank according to claim 6, characterized in that: The rectangular brick is filled into the bottom center area last.

8. The method for replacing the center brick of a spherical bottom iron ladle according to claim 2, characterized in that: The step 4) comprises: Take a central brick and cut it with a surface parallel to any trapezoidal side surface as a first cutting surface to obtain a first irregular fan-shaped brick and a first brick, wherein the first brick is an irregular rectangular parallelepiped brick with a curved surface; Take the first irregular sector-shaped brick and cut it along the second cutting surface to obtain a second irregular sector-shaped brick and a second brick, the second cutting surface is perpendicular to the first cutting surface and the sector-shaped surface of the center brick, and the second brick is an irregular rectangular parallelepiped brick with a curved surface; take the second irregular sector-shaped brick and cut it to obtain a third brick, and the third brick is a rectangular parallelepiped brick; Taking another central brick, cutting it along a surface parallel to the first cutting surface to obtain a fourth brick, wherein the fourth brick is an irregular fan-shaped brick; Taking another central brick, cutting it along a surface parallel to the second cutting surface to obtain a fifth brick, wherein the fifth brick is an irregular fan-shaped brick; Apply aluminum-magnesium-carbon mortar all around the first brick, the second brick, the third brick, the fourth brick, the fifth brick and two complete center bricks, and then fill in the center brick area; among them, the first brick and the fourth brick are spliced ​​into the shape of a center brick, and the second brick, the third brick and the fifth brick are spliced ​​into the shape of a center brick.

9. The method for replacing the center brick of a spherical bottom iron water tank according to claim 1, characterized in that: In the aluminum-magnesium-carbon mortar described in step 5), the Al2O3 content is 50-80%, the MgO content is 5-15%, and the C content is 5-15%.

10. The method for replacing the center brick of a spherical bottom iron ladle according to any one of claims 1 to 9, characterized in that: In step 5), before applying the aluminum-magnesium-carbon mortar, the aluminum-magnesium-carbon mortar is mixed with water and stirred into a slurry state before construction; the weight of the water is 25-45% of the weight of the aluminum-magnesium-carbon mortar.

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