Blast furnace hearth pouring technology

Abstract

The invention discloses a blast furnace hearth pouring technology which comprises the following steps: step 1, blending Metpump10 castable which comprises more than or equal to 70% of sulfur trioxide, more than or equal to 12% of silicon carbide and less than or equal to 8% of silicon dioxide; step 2, blending MetpumpXSR castable, wherein the MetpumpXSR castable comprises not less than 9% of sulfur trioxide, not less than 74% of silicon carbide and not more than 10% of silicon dioxide; thirdly, a residual iron notch channel is subjected to pouring repair, specifically, the residual iron discharging channel is expanded through a drill bit with the large diameter, purging is conducted, it is guaranteed that no foreign matter such as residual iron exists in the channel, and pouring repair is conducted on the residual iron channel through Metpump10 castable; and fourthly, casting of the slag-off door high-heat-conduction lining and the outer ring of the furnace bottom is conducted, specifically, a steel mold of the hearth side wall high-heat-conduction lining is built at the slag-off door through a steel mold plate with the height being 1500 mm and a scaffold pipe, the distance between the inner surface of the steel mold and the hot face of the cooling wall is 250 mm, and grease needs to be evenly smeared on the inner surface of the mold plate so that demolding can be facilitated. The invention relates to the field of blast furnace design, in particular to a blast furnace hearth pouring technology.

Description

Technical Field

[0001] The present invention relates to the field of blast furnace design, in particular to a blast furnace hearth casting technology. Background Art

[0002] The furnace hearth utilizes carbon bricks and ceramic cups. The hearth's "elephant's foot" area experienced elevated temperatures, with temperatures at various taphole locations rising to over 700°C. Furnace protection measures have curbed the temperature increase, but the temperature remains elevated and fluctuates significantly. Overall erosion of the hearth's sidewalls is not yet severe, but localized weaknesses due to "elephant's foot" erosion exist. It is estimated that only 300-400mm of carbon brick thickness remains in areas of thinness. The high temperature, high pressure, and dusty coal gas flow within the furnace pose a potential risk of blowing the steel shell apart. This presents a significant safety hazard in blast furnace operations and requires swift action. To address these hazards, save time, and extend the life of the furnace, a pouring repair of the hearth is necessary. Based on experience with similar blast furnace repairs, the planned implementation includes: removing residual iron, protectively cleaning the furnace bottom and hearth sidewalls, and performing a full-scale pouring repair over the old refractory material.

[0003] Our investigations and discussions revealed that similar blast furnace hearths typically have a relatively short service life after casting, often less than three years. After three years, the furnaces often require major repairs or recasting, severely impacting production and operations. Therefore, through research, we discovered that the primary factors influencing the service life of cast hearths are: cast material quality (primarily the formula), cast thickness, and baking schedule. Summary of the Invention

[0004] The technical problem to be solved by the present invention is To solve the above problems, the technical solution adopted by the present invention is as follows: The present invention is a blast furnace hearth casting technology, comprising the following steps: Step 1: Prepare Metpump10 castable, including sulfur trioxide ≥ 70%, silicon carbide ≥ 12%, and silicon dioxide ≤ 8%; Step 2: Prepare MetpumpXSR castable, including sulfur trioxide ≥9%, silicon carbide ≥74%, and silicon dioxide ≤10%; Step 3: Repair the residual iron channel by pouring: Use a larger diameter drill bit to expand the residual iron channel and blow it out to ensure that there is no residual iron or other foreign matter in the channel. Use Metpump10 castable to repair the residual iron channel by pouring. Step 4: Casting the high thermal conductivity lining of the slag removal door and the outer ring of the furnace bottom: Use a 1500mm high steel template and scaffolding pipe to build a steel mold for the high thermal conductivity lining of the furnace side wall at the slag removal door. The inner surface of the steel mold should be 250mm away from the hot surface of the cooling wall. The inner surface of the template should be evenly greased to facilitate demoulding; use Metpump XSR castable for casting, with a height of 1500mm. Use the plumb line at the outer edge of the front end of the middle sleeve to measure the center point of the furnace bottom to determine the center point of the furnace bottom. Use a 600mm high steel template and scaffolding pipe to build the furnace bottom ring mold on the basis of the furnace bottom carbon bricks. Use Metpump10 castable for casting, with a thickness of 590-610mm; Step 5: Casting the center pad of the furnace bottom: After the casting and curing in step 4 are completed, remove the steel mold, place a 60mm thick ceramic fiberboard on the inner surface of the annular castable, and then cast the center pad of the furnace bottom with Metpump10 castable to a thickness of 600mm; Step 6: First pouring of the side wall working lining: After the curing of the castable in step 5 is completed, the center point of the furnace hearth is confirmed again by measuring the center with the vertical line hanging from the outer edge of the front end of the middle sleeve. A 60° inclined steel formwork with a vertical height of 1000mm and a scaffolding pipe are used to build the first layer of steel mold for the side wall working lining of the furnace hearth on the inner annular surface of the furnace hearth. The inner radius of the upper opening of the inclined formwork in the non-iron mouth area is 5510mm, and the formwork below the iron mouth area is molded according to a straight chord. From the center of the furnace hearth to the midpoint of the straight chord, the horizontal distance is controlled at 4930mm. The inner surface of the steel mold needs to be evenly greased to facilitate demoulding. Use Metpump 10 for pouring, with a height of 990-1010mm. Step 7, second pouring of the side wall, the lower section of the taphole: After the upper layer of castables has cured, use a dry cloth to clean the debris on the top surface of the first layer, and use a template with a height of 1500mm to build the second layer of steel mold for the working lining of the furnace side wall on the upper mold. The inner radius of the non-taphole area is 5510mm, and the taphole chord is controlled by a horizontal distance of 4930mm from the center of the furnace to the midpoint of the chord. Grease the inner surface of the steel mold evenly to facilitate demoulding. During the mold making process, Party A needs to install a steel pipe with an outer diameter of approximately 108mm inside each taphole and adjust the angle. At the same time, weld and seal the outer edge of the taphole frame with steel plates to prevent leakage during pouring. After the steel mold is built, pump Metpump 10 castable into the steel mold, and the pouring height is 1390-1410mm. Step 8: Third pouring of the side wall, upper section of the taphole: After the upper layer of castable is cured, use a dry cloth to clean the debris on the top surface of the second layer. Use a template with a height of 1500mm to build the third layer of steel mold for the working lining of the furnace side wall on the upper mold. The inner radius of the non-taphole area is 5510mm, and the taphole chord is controlled by the horizontal distance of 4930mm from the center of the furnace to the midpoint of the chord. Grease the inner surface of the steel mold evenly to facilitate demoulding. After the steel mold is built, pump Metpump 10 castable into the steel mold. The pouring height is 1590-1610mm. Step 9: Fourth pouring of the side wall, from the taphole to the position below the tuyere: After the upper layer of castable is cured, use a dry cloth to clean the debris on the top surface of the third layer. Use a template with a height of 1500mm to build the fourth layer of steel mold for the working lining of the furnace side wall on the upper mold. The inner radius is unified to 5650mm, and the taphole is staggered. The inner surface of the steel mold needs to be evenly greased to facilitate demoulding. After the steel mold is built, pump the Metpump 10 castable into the steel mold. The pouring height is 1490-1510mm. Step 10, the fifth pouring of the side wall, the lower section of the tuyere belt: After the upper layer of castable is cured, use a dry cloth to clean the debris on the top surface of the fourth layer, and use a template with a height of 1200mm to build the fifth layer of steel mold of the furnace side wall working lining on the upper mold. Take the inner edge of the front end of the tuyere sleeve as the reference, and unify the inner radius of 6000mm. The inner surface of the steel mold needs to be evenly greased to facilitate demoulding. After the steel mold is built, pump Metpump10 castable into the steel mold, and the pouring height is 1190-1210mm. Step 11: Sixth sidewall pour, upper section of the tuyere belt: After the upper layer of castable material has cured, use a dry cloth to clean debris from the top surface of the previous layer. Use a 1500mm-high template to build this layer of steel mold for the working lining of the furnace sidewall on the previous mold. Using the inner edge of the front end of the tuyere sleeve as the reference, set the inner radius to 6000mm. Evenly grease the inner surface of the steel mold to facilitate demolding. Once the steel mold is complete, pump the Metpump10 castable into the mold, pouring it to a height of 1490-1510mm.

[0005] Furthermore, the compressive strength of Metpump10 castable at 110°C for 24 hours is required to be greater than or equal to 24 MPa; the compressive strength of MetpumpXSR castable at 110°C for 24 hours is required to be greater than or equal to 17 MPa.

[0006] Furthermore, the flexural strength of Metpump10 castable at 110°C for 24 hours is required to be greater than or equal to 3 MPa; the flexural strength of MetpumpXSR castable at 110°C for 24 hours is required to be greater than or equal to 3 MPa.

[0007] Furthermore, the bulk density of Metpump10 castable at 110°C for 24 hours is required to be greater than or equal to 2.9 g / cm 3 MetpumpXSR castable, bulk density at 110℃ for 24h, required to be greater than or equal to 2.4g / cm 3 .

[0008] Preferably, the baking system is also optimized and implemented as shown in Table 1 below:

[0009] Table 1 Preferably, other specifications of Metpump10 castable and MetpumpXSR are as shown in Table 2: Table 2 The beneficial effects achieved by the present invention using the above structure are as follows: Our company strictly implements the plan. After its implementation in January 2021, it has been working continuously for 3.5 years. The furnace hearth temperature has been normal. There has been no fluctuation in furnace hearth temperature, redness of the furnace shell, air leakage, or blowing open. The blast furnace has achieved safe, long-lasting and efficient production, bringing huge economic benefits to the company. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a baking and drying curve diagram of the blast furnace hearth casting technology proposed by the present invention. DETAILED DESCRIPTION

[0011] The present invention relates to a blast furnace hearth casting technology, which achieves the beneficial effects of safety and longevity by improving the casting material quality, casting thickness and baking system. Example 1

[0012] The present invention is a blast furnace hearth casting technology, comprising the following steps: Step 1: Prepare Metpump10 castable, including 80% sulfur trioxide, 12% silicon carbide, and 8% silicon dioxide. The compressive strength at 110℃ for 24 hours is required to be greater than or equal to 24Mpa, the flexural strength at 110℃ for 24 hours is required to be greater than or equal to 3Mpa, and the bulk density at 110℃ for 24 hours is required to be greater than or equal to 2.9g / cm 3 ; Step 2: Prepare MetpumpXSR castable, including 10% sulfur trioxide, 80% silicon carbide, and 10% silicon dioxide. The compressive strength at 110°C for 24 hours is required to be greater than or equal to 17 MPa, the flexural strength at 110°C for 24 hours is required to be greater than or equal to 3 MPa, and the bulk density at 110°C for 24 hours is required to be greater than or equal to 2.4 g / cm 3 ; Step 3: Repair the residual iron channel by pouring: Use a larger diameter drill bit to expand the residual iron channel and blow it out to ensure that there is no residual iron or other foreign matter in the channel. Use Metpump10 castable to repair the residual iron channel by pouring. Step 4: Casting the high thermal conductivity lining of the slag removal door and the outer ring of the furnace bottom: Use a 1500mm high steel template and scaffolding pipe to build a steel mold for the high thermal conductivity lining of the furnace side wall at the slag removal door. The inner surface of the steel mold should be 250mm away from the hot surface of the cooling wall. The inner surface of the template should be evenly greased to facilitate demoulding; use Metpump XSR castable for casting, with a height of 1500mm. Use the plumb line at the outer edge of the front end of the middle sleeve to measure the center point of the furnace bottom to determine the center point of the furnace bottom. Use a 600mm high steel template and scaffolding pipe to build the furnace bottom ring mold on the basis of the furnace bottom carbon bricks. Use Metpump10 castable for casting, with a thickness of 590mm. Step 5: Casting the center pad of the furnace bottom: After the casting and curing in step 4 are completed, remove the steel mold, place a 60mm thick ceramic fiberboard on the inner surface of the annular castable, and then cast the center pad of the furnace bottom with Metpump10 castable to a thickness of 600mm; Step 6: First pouring of the side wall working lining: After the curing of the castable in step 5 is completed, the center point of the furnace hearth is confirmed again by measuring the center with the vertical line hanging from the outer edge of the front end of the middle sleeve. A 60° inclined steel formwork with a vertical height of 1000mm and a scaffolding pipe are used to build the first layer of steel mold for the side wall working lining of the furnace hearth on the inner annular surface of the furnace hearth. The inner radius of the upper opening of the inclined formwork in the non-iron mouth area is 5510mm, and the template below the iron mouth area is molded according to a straight chord. From the center of the furnace hearth to the midpoint of the straight chord, the horizontal distance is controlled at 4930mm. The inner surface of the steel mold needs to be evenly greased to facilitate demoulding. Use Metpump 10 for pouring, with a height of 990mm. Step 7, second pouring of the side wall, the lower section of the taphole: After the upper layer of castables has cured, use a dry cloth to clean the debris on the top surface of the first layer, and use a template with a height of 1500mm to build the second layer of steel mold for the working lining of the furnace side wall on the upper mold. The inner radius of the non-taphole area is 5510mm, and the taphole chord is controlled by a horizontal distance of 4930mm from the center of the furnace to the midpoint of the chord. Grease the inner surface of the steel mold evenly to facilitate demoulding. During the mold making process, Party A needs to install a steel pipe with an outer diameter of approximately 108mm inside each taphole and adjust the angle. At the same time, weld and seal the outer edge of the taphole frame with steel plates to prevent leakage during pouring. After the steel mold is built, pump Metpump 10 castable into the steel mold, and the pouring height is 1390mm. Step 8: Third pouring of the side wall, upper section of the taphole: After the upper layer of castable is cured, use a dry cloth to clean the debris on the top surface of the second layer. Use a template with a height of 1500mm to build the third layer of steel mold for the working lining of the furnace side wall on the upper mold. The inner radius of the non-taphole area is 5510mm, and the taphole chord is controlled by the horizontal distance of 4930mm from the center of the furnace to the midpoint of the chord. Grease the inner surface of the steel mold evenly to facilitate demoulding. After the steel mold is built, pump the Metpump 10 castable into the steel mold. The pouring height is 1590mm. Step 9: Fourth pouring of the side wall, from the taphole to the position below the tuyere: After the upper layer of castable is cured, use a dry cloth to clean the debris on the top surface of the third layer. Use a template with a height of 1500mm to build the fourth layer of steel mold for the working lining of the furnace side wall on the upper mold. The inner radius is unified to 5650mm, and the taphole is staggered. The inner surface of the steel mold needs to be evenly greased to facilitate demoulding. After the steel mold is built, pump the Metpump 10 castable into the steel mold. The pouring height is 1490mm. Step 10, the fifth pouring of the side wall, the lower section of the tuyere belt: After the upper layer of castable is cured, use a dry cloth to clean the debris on the top surface of the fourth layer, and use a template with a height of 1200mm to build the fifth layer of steel mold of the furnace side wall working lining on the upper mold. Take the inner edge of the front end of the tuyere middle sleeve as the reference, and unify the inner radius of 6000mm. The inner surface of the steel mold needs to be evenly greased to facilitate demoulding. After the steel mold is built, pump the Metpump10 castable into the steel mold, and the pouring height is 1190mm. Step 11: Sixth sidewall pour, upper section of the tuyere belt: After the upper layer of castable material has cured, use a dry cloth to clean debris from the top surface of the previous layer. Use a 1500mm-high template to build the steel mold for this layer of the furnace sidewall working lining on the previous mold. Using the inner edge of the front end of the tuyere sleeve as the reference, the inner radius is standardized to 6000mm. Grease the inner surface of the steel mold evenly to facilitate demolding. Once the steel mold is complete, pump the Metpump10 castable into the mold, pouring to a height of 1490mm.

[0013] And implement the baking system in Table 1 during the implementation process. Example 2

[0014] The present invention is a blast furnace hearth casting technology, comprising the following steps: Step 1: Prepare Metpump10 castable, including 75% sulfur trioxide, 17% silicon carbide, and 8% silicon dioxide. The compressive strength at 110℃ for 24 hours is required to be greater than or equal to 24 MPa, the flexural strength at 110℃ for 24 hours is required to be greater than or equal to 3 MPa, and the bulk density at 110℃ for 24 hours is required to be greater than or equal to 2.9 g / cm 3 ; Step 2: Prepare MetpumpXSR castable, including 20% ​​sulfur trioxide, 75% silicon carbide, and 5% silicon dioxide. The compressive strength at 110℃ for 24 hours is required to be greater than or equal to 17Mpa, the flexural strength at 110℃ for 24 hours is required to be greater than or equal to 3Mpa, and the bulk density at 110℃ for 24 hours is required to be greater than or equal to 2.4g / cm 3 ; Step 3: Repair the residual iron channel by pouring: Use a larger diameter drill bit to expand the residual iron channel and blow it out to ensure that there is no residual iron or other foreign matter in the channel. Use Metpump10 castable to repair the residual iron channel by pouring. Step 4: Casting the high thermal conductivity lining of the slag removal door and the outer ring of the furnace bottom: Use a 1500mm high steel template and scaffolding pipe to build a steel mold for the high thermal conductivity lining of the furnace side wall at the slag removal door. The inner surface of the steel mold should be 250mm away from the hot surface of the cooling wall. The inner surface of the template should be evenly greased to facilitate demoulding; use Metpump XSR castable for casting, with a height of 1500mm. Use the plumb line at the outer edge of the front end of the middle sleeve to measure the center point of the furnace bottom, and use a 600mm high steel template and scaffolding pipe to build the furnace bottom ring mold on the basis of the furnace bottom carbon bricks. Use Metpump10 castable for casting, with a thickness of 600mm; Step 5: Casting the center pad of the furnace bottom: After the casting and curing in step 4 are completed, remove the steel mold, place a 60mm thick ceramic fiberboard on the inner surface of the annular castable, and then cast the center pad of the furnace bottom with Metpump10 castable to a thickness of 600mm; Step 6: First pouring of the side wall working lining: After the curing of the castable in step 5 is completed, the center point of the furnace hearth is confirmed again by measuring the center with the vertical line hanging from the outer edge of the front end of the middle sleeve. A 60° inclined steel formwork with a vertical height of 1000mm and a scaffolding pipe are used to build the first layer of steel mold for the side wall working lining of the furnace hearth on the inner annular surface of the furnace hearth. The inner radius of the upper opening of the inclined formwork in the non-iron mouth area is 5510mm, and the formwork below the iron mouth area is molded according to a straight chord. From the center of the furnace hearth to the midpoint of the straight chord, the horizontal distance is controlled at 4930mm. The inner surface of the steel mold needs to be evenly greased to facilitate demoulding. Use Metpump 10 for pouring at a height of 1000mm. Step 7, second pouring of the side wall, the lower section of the taphole: After the upper layer of castables has cured, use a dry cloth to clean the debris on the top surface of the first layer, and use a template with a height of 1500mm to build the second layer of steel mold for the working lining of the furnace side wall on the upper mold. The inner radius of the non-taphole area is 5510mm, and the taphole chord is controlled by a horizontal distance of 4930mm from the center of the furnace to the midpoint of the chord. Grease the inner surface of the steel mold evenly to facilitate demoulding. During the mold making process, Party A needs to install a steel pipe with an outer diameter of approximately 108mm inside each taphole and adjust the angle. At the same time, weld and seal the outer edge of the taphole frame with steel plates to prevent leakage during pouring. After the steel mold is built, pump Metpump 10 castable into the steel mold, and the pouring height is 1400mm. Step 8: Third pouring of the side wall, upper section of the taphole: After the upper layer of castable is cured, use a dry cloth to clean the debris on the top surface of the second layer. Use a template with a height of 1500mm to build the third layer of steel mold for the working lining of the furnace side wall on the upper mold. The inner radius of the non-taphole area is 5510mm, and the taphole chord is controlled by the horizontal distance of 4930mm from the center of the furnace to the midpoint of the chord. Grease the inner surface of the steel mold evenly to facilitate demoulding. After the steel mold is built, pump the Metpump 10 castable into the steel mold. The pouring height is 1600mm. Step 9: Fourth pouring of the side wall, from the taphole to the position below the tuyere: After the upper layer of castable is cured, use a dry cloth to clean the debris on the top surface of the third layer. Use a template with a height of 1500mm to build the fourth layer of steel mold for the working lining of the furnace side wall on the upper mold. The inner radius is unified to 5650mm, and the taphole is staggered. The inner surface of the steel mold needs to be evenly greased to facilitate demoulding. After the steel mold is built, pump the Metpump 10 castable into the steel mold. The pouring height is 1500mm. Step 10, the fifth pouring of the side wall, the lower section of the tuyere belt: After the upper layer of castable is cured, use a dry cloth to clean the debris on the top surface of the fourth layer, and use a template with a height of 1200mm to build the fifth layer of steel mold of the furnace side wall working lining on the upper mold. Take the inner edge of the front end of the tuyere sleeve as the reference, and unify the inner radius of 6000mm. The inner surface of the steel mold needs to be evenly greased to facilitate demoulding. After the steel mold is built, pump the Metpump10 castable into the steel mold, and the pouring height is 1200mm. Step 11, Sixth Sidewall Casting, Upper Tuyere Zone: After the upper layer of castable material has cured, use a dry cloth to clean debris from the upper layer's top surface. Use a 1500mm-high template to build the steel mold for this layer of the furnace sidewall working lining on the upper mold. Using the inner edge of the front end of the tuyere sleeve as a reference, maintain a uniform inner radius of 6000mm. Grease the inner surface of the steel mold evenly to facilitate demolding. Once the steel mold is complete, pump the Metpump10 castable into the mold, pouring to a height of 1500mm.

[0015] And implement the baking system in Table 1 during the implementation process. Example 3

[0016] The present invention is a blast furnace hearth casting technology, comprising the following steps: Step 1: Prepare Metpump10 castable, including 70% sulfur trioxide, 25% silicon carbide, and 5% silicon dioxide. The compressive strength at 110℃ for 24 hours is required to be greater than or equal to 24 MPa, the flexural strength at 110℃ for 24 hours is required to be greater than or equal to 3 MPa, and the bulk density at 110℃ for 24 hours is required to be greater than or equal to 2.9 g / cm 3 ; Step 2: Prepare MetpumpXSR castable, including 15% sulfur trioxide, 75% silicon carbide, and 10% silicon dioxide. The compressive strength at 110℃ for 24 hours is required to be greater than or equal to 17Mpa, the flexural strength at 110℃ for 24 hours is required to be greater than or equal to 3Mpa, and the bulk density at 110℃ for 24 hours is required to be greater than or equal to 2.4g / cm 3 ; Step 3: Repair the residual iron channel by pouring: Use a larger diameter drill bit to expand the residual iron channel and blow it out to ensure that there is no residual iron or other foreign matter in the channel. Use Metpump10 castable to repair the residual iron channel by pouring. Step 4: Casting the high thermal conductivity lining of the slag removal door and the outer ring of the furnace bottom: Use a 1500mm high steel template and scaffolding pipe to build a steel mold for the high thermal conductivity lining of the furnace side wall at the slag removal door. The inner surface of the steel mold should be 250mm away from the hot surface of the cooling wall. The inner surface of the template should be evenly greased to facilitate demoulding; use Metpump XSR castable for casting, with a height of 1500mm. Use the plumb line at the outer edge of the front end of the middle sleeve to measure the center point of the furnace bottom, and use a 600mm high steel template and scaffolding pipe to build the furnace bottom ring mold on the basis of the furnace bottom carbon bricks. Use Metpump10 castable for casting, with a thickness of 610mm; Step 5: Casting the center pad of the furnace bottom: After the casting and curing in step 4 are completed, remove the steel mold, place a 60mm thick ceramic fiberboard on the inner surface of the annular castable, and then cast the center pad of the furnace bottom with Metpump10 castable to a thickness of 600mm; Step 6: First pouring of the side wall working lining: After the curing of the castable in step 5 is completed, the center point of the furnace hearth is confirmed again by measuring the center with the vertical line at the outer edge of the front end of the middle sleeve. A 60° inclined steel formwork with a vertical height of 1000mm and a scaffolding pipe are used to build the first layer of steel mold for the side wall working lining of the furnace hearth on the inner annular surface of the furnace hearth. The inner circle radius of the upper opening of the inclined formwork in the non-iron mouth area is 5510mm, and the template below the iron mouth area is molded according to a straight chord. From the center of the furnace hearth to the midpoint of the straight chord, the horizontal distance is controlled at 4930mm. The inner surface of the steel mold needs to be evenly greased to facilitate demoulding. Use Metpump 10 for pouring, with a height of 1010mm. Step 7, second pouring of the side wall, the lower section of the taphole: After the upper layer of castables has cured, use a dry cloth to clean the debris on the top surface of the first layer, and use a template with a height of 1500mm to build the second layer of steel mold for the working lining of the furnace side wall on the upper mold. The inner radius of the non-taphole area is 5510mm, and the taphole chord is controlled by a horizontal distance of 4930mm from the center of the furnace to the midpoint of the chord. Grease the inner surface of the steel mold evenly to facilitate demoulding. During the mold making process, Party A needs to install a steel pipe with an outer diameter of approximately 108mm inside each taphole and adjust the angle. At the same time, weld and seal the outer edge of the taphole frame with steel plates to prevent leakage during pouring. After the steel mold is built, pump Metpump 10 castable into the steel mold, and the pouring height is 1410mm; Step 8: Third pouring of the side wall, upper section of the taphole: After the upper layer of castable is cured, use a dry cloth to clean the debris on the top surface of the second layer. Use a template with a height of 1500mm to build the third layer of steel mold for the working lining of the furnace side wall on the upper mold. The inner radius of the non-taphole area is 5510mm, and the taphole chord is controlled by the horizontal distance of 4930mm from the center of the furnace to the midpoint of the chord. Grease the inner surface of the steel mold evenly to facilitate demoulding. After the steel mold is built, pump Metpump 10 castable into the steel mold. The pouring height is 1610mm. Step 9: Fourth pouring of the side wall, from the taphole to the position below the tuyere: After the upper layer of castable is cured, use a dry cloth to clean the debris on the top surface of the third layer. Use a template with a height of 1500mm to build the fourth layer of steel mold for the working lining of the furnace side wall on the upper mold. The inner radius is unified to 5650mm, and the taphole is staggered. The inner surface of the steel mold needs to be evenly greased to facilitate demoulding. After the steel mold is built, pump Metpump 10 castable into the steel mold. The pouring height is 1510mm. Step 10, the fifth pouring of the side wall, the lower section of the tuyere belt: After the upper layer of castable is cured, use a dry cloth to clean the debris on the top surface of the fourth layer, and use a template with a height of 1200mm to build the fifth layer of steel mold of the furnace side wall working lining on the upper mold. Take the inner edge of the front end of the tuyere sleeve as the reference, and unify the inner radius of 6000mm. The inner surface of the steel mold needs to be evenly greased to facilitate demoulding. After the steel mold is built, pump Metpump10 castable into the steel mold, and the pouring height is 1210mm; Step 11: Sixth sidewall pour, upper section of the tuyere belt: After the upper layer of castable material has cured, use a dry cloth to clean debris from the top surface of the previous layer. Use a 1500mm-high template to build this layer of steel mold for the working lining of the furnace sidewall on the previous mold. Using the inner edge of the front end of the tuyere sleeve as the reference, set the inner radius to 6000mm. Evenly grease the inner surface of the steel mold to facilitate demolding. Once the steel mold is complete, pump the Metpump10 castable into the mold, pouring it to a height of 1510mm.

[0017] And implement the baking system in Table 1 during the implementation process.

[0018] It should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. Blast furnace hearth casting technology, characterized in that: The steps include: Step 1: prepare Metpump10 casting material, including sulfur trioxide ≥ 70%, silicon carbide ≥ 12%, and silicon dioxide ≤ 8%; Step 2: prepare MetpumpXSR castable, including sulfur trioxide ≥ 9%, silicon carbide ≥ 74%, and silicon dioxide ≤ 10%; Step 3: Repair the residual iron channel by pouring: Use a larger diameter drill to expand the residual iron channel and blow it to ensure that there is no residual iron or other foreign matter in the channel. Use Metpump10 casting material to repair the residual iron channel by pouring. Step 4: Casting of high thermal conductivity lining of the slag removal door and outer ring of the furnace bottom: Use a steel template with a height of 1500mm and scaffolding pipe to build a steel template for the high thermal conductivity lining of the furnace side wall at the slag removal door. The inner surface of the steel template is 250mm away from the hot surface of the cooling wall. Grease should be evenly applied to the inner surface of the template to facilitate demoulding; Use Metpump XSR castable for casting, with a height of 1500mm, and measure the center with the vertical line at the outer edge of the front end of the middle sleeve to determine the center point of the furnace cylinder. Use a steel template with a height of 600mm and scaffolding pipe to build a furnace bottom ring mold on the basis of the furnace bottom carbon bricks, and use Metpump10 castable for casting, with a thickness of 590-610mm; Step 5: Casting the center pad of the furnace bottom: After the casting and curing in step 4 are completed, remove the steel mold, place a 60mm thick ceramic fiberboard on the inner surface of the annular casting material, and then cast the center pad of the furnace bottom with Metpump10 casting material, with a thickness of 600mm; Step 6, first pouring of the side wall working lining: After the curing of the castable in step 5 is completed, measure the center with the vertical line hanging from the outer edge of the front end of the middle sleeve, confirm the center point of the furnace cylinder again, and use a 60° inclined steel template with a vertical height of 1000mm and a scaffolding pipe to build the first layer of steel mold for the working lining of the side wall of the furnace cylinder on the inner annular surface of the side wall of the furnace cylinder. The inner radius of the upper opening of the inclined mold in the non-iron mouth area is 5510mm, and the template below the iron mouth area is molded according to the straight chord. From the center of the furnace cylinder to the midpoint of the straight chord, the horizontal distance is controlled at 4930mm. Grease should be evenly applied to the inner surface of the steel mold to facilitate demoulding. Use Metpump 10 for pouring, and the height is 990-1010mm; Step 7, second pouring of the side wall, the lower section of the iron mouth: After the upper layer of castables is cured, use a dry cloth to clean the debris on the top surface of the first layer, and use a template with a height of 1500mm to build the second layer of steel mold for the working lining of the furnace side wall on the upper mold. The inner radius of the non-iron mouth area is 5510mm, and the iron mouth straight chord is controlled according to the horizontal distance of 4930mm from the center of the furnace to the midpoint of the straight chord. Grease should be evenly applied to the inner surface of the steel mold to facilitate demoulding. During the mold making process, Party A needs to install a steel pipe with an outer diameter of about 108mm inside each iron mouth and adjust the angle. At the same time, the outer edge of the iron mouth frame is welded and sealed with steel plates to prevent leakage during pouring. After the steel mold is built, pump Metpump 10 castable into the steel mold, and the pouring height is 1390-1410mm; Step 8, third pouring of the side wall, upper part of the taphole: After the upper layer of castables is cured, use a dry cloth to clean the debris on the top surface of the second layer, and use a template with a height of 1500mm to build the third layer of steel mold for the working lining of the furnace side wall on the upper mold. The inner radius of the non-taphole area is 5510mm, and the taphole straight chord is controlled by the horizontal distance of 4930mm from the center of the furnace to the midpoint of the straight chord. Grease should be evenly applied to the inner surface of the steel mold to facilitate demoulding. After the steel mold is built, pump Metpump 10 castable into the steel mold, and the pouring height is 1590-1610mm; Step 9, the fourth pouring of the side wall, from the top of the taphole to the position below the tuyere: After the upper layer of castables is cured, use a dry cloth to clean the debris on the top surface of the third layer, and use a template with a height of 1500mm to build the fourth layer of steel mold for the working lining of the furnace side wall on the upper mold, with a unified inner radius of 5650mm, and the top of the taphole is staggered. Grease should be evenly applied to the inner surface of the steel mold to facilitate demoulding. After the steel mold is built, pump Metpump 10 castable into the steel mold, and the pouring height is 1490-1510mm; Step 10, the fifth pouring of the side wall, the lower section of the tuyere belt: After the upper layer of the castable is cured, use a dry cloth to clean the debris on the top surface of the fourth layer, and use a template with a height of 1200mm to build the fifth layer of steel mold of the working lining of the furnace side wall on the upper mold. Take the inner edge of the front end of the tuyere middle sleeve as the reference, and unify the inner radius of 6000mm. Grease should be evenly applied to the inner surface of the steel mold to facilitate demoulding. After the steel mold is built, pump the Metpump10 castable into the steel mold, and the pouring height is 1190-1210mm; Step 11, the sixth pouring of the side wall, the upper position of the tuyere belt: After the upper layer of castables is cured, use a dry cloth to clean the debris on the top surface of the upper layer, and use a template with a height of 1500mm to build this layer of steel mold for the working lining of the furnace side wall on the upper layer of the mold. Take the inner edge of the front end of the tuyere middle sleeve as the reference, and unify the inner radius of 6000mm. Grease should be evenly applied to the inner surface of the steel mold to facilitate demoulding. After the steel mold is built, pump the Metpump10 castable into the steel mold, and the pouring height is 1490-1510mm.

2. The blast furnace hearth casting technology according to claim 1, characterized in that: Metpump10 castable, compressive strength at 110℃ for 24h is required to be greater than or equal to 24Mpa; MetpumpXSR castable, compressive strength at 110℃ for 24h is required to be greater than or equal to 17Mpa.

3. The blast furnace hearth casting technology according to claim 2 is characterized in that: Metpump10 castable, flexural strength at 110℃ for 24h is required to be greater than or equal to 3Mpa; MetpumpXSR castable, flexural strength at 110℃ for 24h is required to be greater than or equal to 3Mpa.

4. The blast furnace hearth casting technology according to claim 3 is characterized in that: Metpump10 casting material, volume density at 110℃ for 24h, required to be greater than or equal to 2.9g / cm 3 ; MetpumpXSR castable, volume density at 110℃ for 24h, required to be greater than or equal to 2.4g / cm 3 .

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