Efficient tundish coating material spraying and building method

Abstract

The invention relates to the technical field of ferrous metallurgy refractory material maintenance, and particularly discloses an efficient tundish coating material spraying masonry method which comprises the following steps: adjusting the mixing ratio of a coating material and water, and fully stirring; the stirred coating material is continuously conveyed into a high-pressure hose in a mechanical transmission mode; a homodromous compressed air source pipeline is arranged at an outlet of the high-pressure hose, and the coating slurry flowing out of the outlet of the high-pressure hose is uniformly blown to a tundish lining and is attached to a tundish permanent layer; the temperature of the tundish permanent layer is controlled at 160-240 DEG C before the coating material is sprayed, and moisture can be quickly evaporated after the coating material is sprayed; a layer-by-layer spraying mode is used, and a next layer is sprayed after the sprayed coating material is solidified and dried; after the last layer of coating material is sprayed, the surface is flattened through a flat plate type tool; carrying out hole pricking on the trowelled coating material; the tundish building speed is effectively increased, the building period is shortened, safety and reliability are achieved, and the labor intensity of operators is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of refractory maintenance in iron and steel metallurgy, and particularly relates to a method for spraying and laying a high-efficiency tundish daubing material. Background Art

[0002] The spraying of refractory materials for continuous casting tundishes is a key process in continuous casting production, directly affecting the service life of tundishes, the purity of molten steel, and production costs.

[0003] Generally, two types of refractory materials, dry materials and daubing materials, are used for continuous casting tundishes. Due to defects such as low laying efficiency and high labor intensity of daubing materials, they have gradually been replaced by dry materials. However, because daubing materials have a lower cost and lower requirements for carbon content such as ultra-low carbon, there is still a large volume of application for daubing materials in tundish refractory materials. Currently, the service life of daubing materials is long, the spraying efficiency is low, and the labor intensity is high. Therefore, a method for spraying and laying a high-efficiency tundish daubing material is designed to solve the problems of low laying efficiency and high labor intensity of existing daubing materials. Summary of the Invention

[0004] Aiming at the problems existing in the prior art, the purpose of the present invention is to provide a method for spraying and laying a high-efficiency tundish daubing material.

[0005] The technical solution adopted by the present invention to solve its technical problems is: a method for spraying and laying a high-efficiency tundish daubing material, comprising the following steps:

[0006] 1) Adjust the water mixing ratio of the daubing material and fully stir it;

[0007] 2) Use a mechanical transmission method to continuously convey the stirred daubing material into a high-pressure hose;

[0008] 3) Set a co-directional compressed air gas source pipeline at the outlet of the high-pressure hose, and evenly blow the daubing material slurry flowing out of the outlet of the high-pressure hose onto the inner lining of the tundish and attach it to the permanent layer of the tundish;

[0009] 4) Control the temperature of the permanent layer of the tundish at 160 - 240 °C before spraying the daubing material, so that the water can be quickly evaporated after spraying the daubing material;

[0010] 5) Use a layer-by-layer spraying method, and spray the next layer after the sprayed daubing material solidifies and dries;

[0011] 6) After the last layer of daubing material is sprayed, use a flat tool to level the surface;

[0012] 7) Punch holes in the leveled daubing material.

[0013] Specifically, the mixing ratio of the coating material and water in step 1) is to mix at a ratio of 200-260 kg of water per 1 ton of coating material, and use manual stirring or mechanical stirring to fully stir until it becomes viscous and flowable.

[0014] Specifically, the mechanical transmission method in step 2) is screw pump transportation. The discharge port of the screw pump is connected to a high-pressure hose, and the inner diameter of the high-pressure hose is 30-40 mm, and the length of the high-pressure hose is controlled within 10 m.

[0015] Specifically, the compressed air source pipeline in step 3) is connected to an air compressor, and the air compressor controls the pressure of the compressed air source pipeline to be 0.4-0.8 MPa.

[0016] Specifically, the layer-by-layer spraying method in step 5) is to evenly spray the fully mixed and stirred coating material onto the permanent layer of the tundish in the manner described in step 2) and step 3). The thickness of each layer of coating material is controlled within 15-20 mm, and 2-4 layers are sprayed according to needs.

[0017] Specifically, the hole punching in step 7) uses steel nails with a diameter of 1-2 mm, the hole punching depth is 15-25 mm, and the hole spacing is 40-60 mm to enable rapid and sufficient evaporation of moisture.

[0018] The present invention has the following beneficial effects:

[0019] The high-efficiency tundish coating material spraying and masonry method designed by the present invention effectively improves the tundish masonry speed, reduces the masonry construction period, and the curing time (masonry and drying time) is reduced from more than 12 hours to 8 hours.

[0020] The high-efficiency tundish coating material spraying and masonry method designed by the present invention has a large spraying force, a uniform spraying surface, stronger adhesion, reduces the risk of collapse of the working layer of the tundish, and is safer and more reliable.

[0021] The high-efficiency tundish coating material spraying and masonry method designed by the present invention does not use carbon-containing substances such as phenolic resin as a binder, and there is no dust during the spraying process, which conforms to the national industrial policy of green, low-carbon and environmental protection.

[0022] The high-efficiency tundish coating material spraying and masonry method designed by the present invention utilizes the waste heat after the permanent layer of the tundish is recycled. When spraying, the temperature is high and the moisture evaporates quickly.

[0023] The high-efficiency tundish coating material spraying and masonry method designed by the present invention improves the masonry efficiency of the coating material and reduces the labor intensity of the operators. Detailed implementation method

[0024] The technical solutions in the embodiments of the present invention will be further described clearly and completely below. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0025] An efficient spraying and laying method for tundish coating material includes the following steps:

[0026] 1. Adjust the water mixing ratio of the coating material. Mix it at a ratio of 200 - 260 kilograms of water per 1 ton of coating material, and use manual stirring or mixer stirring to fully stir until it becomes viscous and flowable.

[0027] 2. Use a mechanical transmission method, which is screw pump transportation. The discharge port of the screw pump is connected to a high-pressure hose. Continuously transport the stirred coating material into the high-pressure hose. The inner diameter of the high-pressure hose is 30 - 40 mm, and the length of the high-pressure hose is controlled within 10 m.

[0028] 3. Set a co-directional compressed air gas source pipeline at the outlet of the high-pressure hose. The compressed air gas source pipeline is connected to an air compressor. The air compressor controls the pressure of the compressed air gas source pipeline to be 0.4 - 0.8 MPa, and evenly spray the coating material slurry flowing out of the outlet of the high-pressure hose onto the tundish inner lining, so that it can strongly and evenly adhere to the tundish permanent layer.

[0029] 4. Control the temperature of the tundish permanent layer before spraying the coating material at 160 - 240 °C, so that the moisture can be quickly evaporated after spraying the coating material.

[0030] 5. Use a layer-by-layer spraying method. Uniformly spray the fully mixed and stirred coating material onto the tundish permanent layer in the manner described in steps 2 and 3. The thickness of each layer of coating material is controlled at 15 - 20 mm. Spray the next layer after the sprayed coating material solidifies and dries. Spray 2 - 4 layers according to needs.

[0031] 6. After the last layer of coating material is sprayed, use a flat tool to smooth the surface.

[0032] 7. Use steel nails with a diameter of 1 - 2 mm to punch holes in the smoothed coating material. The depth of the punched holes is 15 - 25 mm, and the hole spacing is 40 - 60 mm to enable the moisture to evaporate quickly and fully.

[0033] Example 1: The coating material has a large viscosity and a large coating thickness.

[0034] 1. Adjust the water mixing ratio of the coating material. Mix it at a ratio of 200 kilograms of water per 1 ton of coating material, and use manual stirring or mixer stirring to fully stir until it becomes viscous and flowable.

[0035] 2. Use a mechanical transmission method, which is screw pump transportation. The discharge port of the screw pump is connected to a high-pressure hose, and the well-mixed coating material is continuously transported into the high-pressure hose. The inner diameter of the high-pressure hose is 40 mm, and the length of the high-pressure hose is 10 m.

[0036] 3. At the outlet of the high-pressure hose, a co-directional compressed air gas source pipeline is set up. The compressed air gas source pipeline is connected to an air compressor. The air compressor controls the pressure of the compressed air gas source pipeline to be 0.4 MPa, and the coating material slurry flowing out of the outlet of the high-pressure hose is evenly blown onto the lining of the tundish, so that it can adhere to the permanent layer of the tundish powerfully and evenly.

[0037] 4. Before spraying the coating material on the permanent layer of the tundish, the temperature is controlled at 160 °C, and the moisture can be quickly evaporated after spraying the coating material.

[0038] 5. Use the layer-by-layer spraying method, and spray the well-mixed and stirred coating material evenly onto the permanent layer of the tundish in the manner described in Step 2 and Step 3. The thickness of each layer of the coating material is controlled at 20 mm. After the sprayed coating material solidifies and dries, then spray the next layer. Spray 4 layers according to needs.

[0039] 6. After the last layer of the coating material is sprayed, use a flat tool to level the surface.

[0040] 7. Use steel nails with a diameter of 2 mm to punch holes in the leveled coating material. The depth of the punched holes is 25 mm, and the hole spacing is 60 mm, so that the moisture can evaporate quickly and fully.

[0041] The curing time (laying and drying time) is 10 hours.

[0042] Example 2: The viscosity of the coating material is moderate and the coating thickness is moderate.

[0043] 1. Adjust the water mixing ratio of the coating material, and mix it at a ratio of 230 kg of water per 1 ton of coating material. Use manual stirring or mixer stirring method, and stir it fully until it is viscous and flowable.

[0044] 2. Use a mechanical transmission method, which is screw pump transportation. The discharge port of the screw pump is connected to a high-pressure hose, and the well-mixed coating material is continuously transported into the high-pressure hose. The inner diameter of the high-pressure hose is 35 mm, and the length of the high-pressure hose is 10 m.

[0045] 3. At the outlet of the high-pressure hose, a co-directional compressed air gas source pipeline is set up. The compressed air gas source pipeline is connected to an air compressor. The air compressor controls the pressure of the compressed air gas source pipeline to be 0.6 MPa, and the coating material slurry flowing out of the outlet of the high-pressure hose is evenly blown onto the lining of the tundish, so that it can adhere to the permanent layer of the tundish powerfully and evenly.

[0046] 4. The temperature of the tundish permanent layer before spraying the coating material is controlled at 200°C, and the moisture can be quickly evaporated after spraying the coating material.

[0047] 5. Use the layer-by-layer spraying method to evenly spray the well-mixed coating material onto the tundish permanent layer in the manner described in steps 2 and 3. The thickness of each layer of the coating material is controlled at 18 mm. After the sprayed coating material solidifies and dries, spray the next layer. Spray 3 layers as needed.

[0048] 6. After the last layer of the coating material is sprayed, use a flat tool to smooth the surface.

[0049] 7. Use steel nails with a diameter of 1.5 mm to punch holes in the smoothed coating material. The depth of the holes is 20 mm, and the hole spacing is 50 mm to allow the moisture to evaporate quickly and fully.

[0050] The curing time (laying and drying time) is 9 hours.

[0051] Example 3: The coating material has a low viscosity and a small coating thickness.

[0052] 1. Adjust the water mixing ratio of the coating material. Mix it at a ratio of 260 kg of water per 1 ton of the coating material. Use manual stirring or mixer stirring methods to fully stir until it becomes viscous and flowable.

[0053] 2. Use the mechanical transmission method. The mechanical transmission method is screw pump transportation. The discharge port of the screw pump is connected to a high-pressure hose. Continuously transport the stirred coating material into the high-pressure hose. The inner diameter of the high-pressure hose is 30 mm, and the length of the high-pressure hose is 10 m.

[0054] 3. Set a co-directional compressed air gas source pipeline at the outlet of the high-pressure hose. The compressed air gas source pipeline is connected to an air compressor. The air compressor controls the pressure of the compressed air gas source pipeline at 0.8 MPa. Evenly spray the coating material slurry flowing out of the outlet of the high-pressure hose onto the tundish lining so that it can strongly and evenly adhere to the tundish permanent layer.

[0055] 4. The temperature of the tundish permanent layer before spraying the coating material is controlled at 240°C, and the moisture can be quickly evaporated after spraying the coating material.

[0056] 5. Use the layer-by-layer spraying method to evenly spray the well-mixed coating material onto the tundish permanent layer in the manner described in steps 2 and 3. The thickness of each layer of the coating material is controlled at 15 mm. After the sprayed coating material solidifies and dries, spray the next layer. Spray 2 layers as needed.

[0057] 6. After the last layer of the coating material is sprayed, use a flat tool to smooth the surface.

[0058] 7. Use a 1-mm-diameter steel nail to punch holes in the plaster after troweling. The depth of the holes is 15 mm, and the hole spacing is 40 mm to allow water to evaporate quickly and fully.

[0059] The curing time (laying and drying time) is 8 hours.

[0060] The present invention is not limited to the above embodiments. Anyone should know that structural changes made under the inspiration of the present invention, as long as they have the same or similar technical solutions as the present invention, fall within the protection scope of the present invention.

[0061] The technologies, shapes, and structures not described in detail in the present invention are all well-known technologies.

Claims

1. An efficient spraying and laying method for tundish coating materials, characterized in that It includes the following steps: 1) Adjust the water mixing ratio of the daubing material and stir it thoroughly. 2) Use a mechanical transmission method to continuously convey the stirred daubing material into a high-pressure hose. 3) Set a co-directional compressed air source pipeline at the outlet of the high-pressure hose, and evenly spray the daubing material slurry flowing out of the outlet of the high-pressure hose onto the lining of the tundish and attach it to the permanent layer of the tundish. 4) Control the temperature of the tundish permanent layer before spraying the daubing material at 160 - 240 °C, and the water can be quickly evaporated after spraying the daubing material. 5) Use a layer-by-layer spraying method, and spray the next layer after the sprayed daubing material solidifies and dries. 6) After the last layer of daubing material is sprayed, use a flat tool to smooth the surface. 7) Punch holes in the smoothed daubing material.

2. The efficient tundish coating spraying and laying method according to claim 1, wherein In step 1), the water mixing ratio of the daubing material is mixed at a ratio of 200 - 260 kg of water per 1 ton of daubing material, and it is stirred thoroughly by manual stirring or using a mixer until it becomes viscous and flowable.

3. The high-efficiency tundish coating spraying and masonry method according to claim 1, characterized in that, In step 2), the mechanical transmission method is screw pump transportation. The discharge port of the screw pump is connected to the high-pressure hose. The inner diameter of the high-pressure hose is 30 - 40 mm, and the length of the high-pressure hose is controlled within 10 m.

4. The spraying and masonry method of the high-efficiency tundish coating according to claim 1, wherein In step 3), the compressed air source pipeline is connected to an air compressor, and the air compressor controls the pressure of the compressed air source pipeline at 0.4 - 0.8 MPa.

5. The spraying and laying method of the high-efficiency tundish coating according to claim 1, characterized in that In step 5), the layer-by-layer spraying method is to evenly spray the daubing material that has been fully mixed and stirred onto the permanent layer of the tundish in the manner described in steps 2) and 3). The thickness of each layer of daubing material is controlled at 15 - 20 mm, and 2 - 4 layers are sprayed according to needs.

6. The high-efficiency tundish coating spraying and laying method according to claim 1, characterized in that In step 7), the hole punching is carried out with steel nails with a diameter of 1 - 2 mm, the hole punching depth is 15 - 25 mm, and the hole spacing is 40 - 60 mm to enable the water to evaporate quickly and fully.