Construction method of tundish dry material working layer for continuous casting

Abstract

The invention discloses a construction method of a tundish dry material working layer for continuous casting, which relates to the field of metallurgical engineering and comprises the following steps: step 1, preparation before construction; secondly, bottom covering construction is conducted; thirdly, a mold and a partition plate are installed; 4, side wall construction; step 5, vibration and strickling; step 6, baking and curing; and 7, demolding and subsequent treatment are conducted. The method can avoid the use of a wet process, save energy consumed by construction, prevent impurities from influencing the construction quality, enhance the structural integrity of the permanent layer, guarantee the normal function of the tundish, improve the construction efficiency and the quality of finished products, prevent materials from blocking a water gap, prevent local difference from influencing the construction quality, and realize seamless installation of the partition plate; the problems of material leakage and the like are prevented, the side wall construction quality can be guaranteed, normal use of the tundish is facilitated, the pouring material quality can be improved, the compacted pouring material is prevented from being damaged, the curing quality is guaranteed, and damage to a working lining and collision of a mold are avoided.

Description

Technical Field

[0001] The invention relates to the field of metallurgical engineering, in particular to a method for constructing a working layer of a middle-package dry material for continuous casting. Background Art

[0002] The working layer of dry material in the tundish for continuous casting refers to the dry material layer inside the tundish (middle ladle) used to carry the molten metal during the continuous casting process. This layer of material is usually used to improve the refractory and thermal insulation properties of the tundish, ensure that the temperature of the molten metal is maintained from the furnace to the casting process, and prevent direct contact between the molten metal and the ladle wall, thereby reducing the wear of the ladle wall and the oxidation of the molten metal.

[0003] Traditionally, the construction of the working layer of the tundish mostly adopts wet processes, such as using refractory castables by adding water and stirring before pouring. However, this wet process has many disadvantages. Adding water during the construction process will introduce moisture, and a lot of time and energy are required to remove the moisture during the subsequent baking and drying. If the moisture is not completely removed, water vapor is easily generated when the molten steel is injected, which will cause quality problems such as molten steel splashing and inclusions, affecting the purity of the ingot. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides a method for constructing a working layer of a middle-package dry material for continuous casting, which solves the problems raised in the above-mentioned background technology.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: A method for constructing a working layer of a middle-package dry material for continuous casting, comprising the following steps:

[0006] Step 1: Preparation before construction: clean the permanent layer of the tundish, prepare the fetal membrane, and prepare dry materials;

[0007] Step 2: Ladle bottom construction: install the tundish water inlet seat bricks and pour the dry material into the ladle bottom;

[0008] Step 3: Install the mold and partition: Place a standard thickness mold in the middle of the impact zone and the steel casting zone, and install a movable partition at the boundary between the impact zone and the steel casting zone;

[0009] Step 4: Side wall construction: Use dry material to cast the wall in sequence;

[0010] Step 5: Vibration and leveling: Pull out the movable partition, turn on the automatic vibrator, and then level the surface of the casting material;

[0011] Step 6: Bake and solidify: Turn on the baker, set the time and temperature for baking;

[0012] Step 7: Demolding and subsequent processing: Take out the baking utensils and install the slag retaining wall.

[0013] According to the above technical solution, the pre-construction preparation process described in step 1 includes the following steps:

[0014] S1: Clean the permanent layer of the tundish. It is necessary to remove the residue and dust of the permanent layer of the tundish, repair the local damaged parts, and ensure that its outer surface is flat and smooth;

[0015] S2: prepare the fetal membrane, make the fetal membrane and inspect and clean it, and after cleaning, apply a mixture of graphite and waste oil as a release agent;

[0016] S3: Prepare dry materials, mix aggregate and powder in a specific proportion, add binder and stir thoroughly.

[0017] According to the above technical scheme, during the bottom construction process described in step 2, the level of the tundish water inlet seat brick is ensured when it is installed, and a woven bag or the like is stuffed into the inner hole of the seat brick to prevent leakage and clogging of the water inlet. After the dry material is evenly poured into the bottom of the ladle according to the designed thickness, it is leveled with a shovel and then flattened with a tamping tool. The construction height is slightly higher than the upper surface of the water inlet seat brick.

[0018] According to the above technical solution, during the installation of the mold and the partition described in step three, a standard thickness mold is placed in the middle position between the impact zone and the steel pouring zone, the roaster mold is lifted and placed in the tundish to fit it with the mold, and a movable partition is installed at the boundary between the impact zone and the steel pouring zone to ensure that there is no gap at the contact between the partition and the mold and the permanent lining.

[0019] According to the above technical scheme, during the side wall construction process described in step 4, a crane is used to lift the ton bag of dry material of the working lining of the impact zone to the middle ladle, the discharge port is opened, and the material is poured evenly while moving. After filling one side of the bag wall, the other side is constructed; the same method is used to pour the dry material of the working lining of the steel zone.

[0020] According to the above technical solution, during the vibration and leveling process described in step five, the movable partition and the standard thickness mold are pulled out, the baking machine is turned on to automatically vibrate for 20 seconds to 30 seconds, and then the surface of the casting material is leveled.

[0021] According to the above technical solution, during the baking and curing process described in step six, the automatic baker on the mold is turned on, the baking time is set to 90 minutes-150 minutes, the maximum temperature is set to 300℃-380℃, the heating rate is set to 8℃ / min-12℃, and the cooling time is 120 minutes-180 minutes.

[0022] According to the above technical solution, after the demoulding described in step seven and the automatic baking in the subsequent processing process is completed, the baking machine mold is pulled out vertically by a crane to avoid bumping against the working lining, and the slag retaining wall is installed.

[0023] The present invention provides a method for constructing a working layer of a middle-package dry material for continuous casting. It has the following beneficial effects:

[0024] (1) The dry material working layer construction method for the tundish for continuous casting avoids the use of wet process, saves energy consumed in construction, is conducive to the subsequent material bonding, avoids the influence of impurities on the construction quality, can enhance the structural integrity of the permanent layer, prevent problems during use, ensure the normal function of the tundish, ensure the demoulding effect, and improve the construction efficiency and the quality of the finished product.

[0025] (2) The construction method of the dry material working layer of the intermediate ladle for continuous casting can ensure smooth subsequent use, avoid material blocking the water inlet, avoid local differences affecting the construction quality, ensure the overall bottom construction quality, ensure construction safety and quality, ensure installation quality, avoid gaps affecting use, achieve seamless installation of partitions, prevent material leakage and other problems, ensure the side wall construction quality, and facilitate the normal use of the intermediate ladle.

[0026] (3) The construction method of the working layer of the middle-package dry material for continuous casting can avoid collision and scratching, ensure smooth vibration, improve the quality of the casting material, avoid damage to the dense casting material, ensure that the casting material is fully solidified, ensure the solidification quality, and avoid damage to the working lining and collision with the mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall steps of the present invention;

[0028] Figure 2 This is a schematic diagram of step 1 of the present invention. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] See also Figure 1-Figure 2 The present invention specifically provides a method for constructing a working layer of a middle-package dry material for continuous casting, comprising the following steps:

[0031] Step 1: Preparation before construction: clean the permanent layer of the tundish, prepare the fetal membrane, and prepare dry materials;

[0032] Step 2: Ladle bottom construction: install the tundish water inlet seat bricks and pour the dry material into the ladle bottom;

[0033] Step 3: Install the mold and partition: Place a standard thickness mold in the middle of the impact zone and the steel casting zone, and install a movable partition at the boundary between the impact zone and the steel casting zone;

[0034] Step 4: Side wall construction: Use dry material to cast the wall in sequence;

[0035] Step 5: Vibration and leveling: Pull out the movable partition, turn on the automatic vibrator, and then level the surface of the casting material;

[0036] Step 6: Bake and solidify: Turn on the baker, set the time and temperature for baking;

[0037] Step 7: Demolding and subsequent processing: Take out the baking utensils and install the slag retaining wall as needed.

[0038] Step 1 The pre-construction preparation process includes the following steps:

[0039] S1: Clean the permanent layer of the tundish. It is necessary to remove the residue and dust of the permanent layer of the tundish, repair the local damaged parts, and ensure that its outer surface is flat and smooth;

[0040] S2: Prepare the membrane, use an integral working layer membrane, the gas type of the membrane is coke oven gas, and the calorific value of the gas is 18GJ / kM 3 The gas pressure is 0.6MPa, the combustion medium is air, the combustion method is forced blast, the baking temperature is between 350-400℃, the baking time is about 2 hours, the cooling method is forced blast cooling, and PLC control is used during baking. The working layer thickness of the finished fetal membrane reaches 90mm for the steel area wall, 60mm for the non-steel area wall, and 60mm for the bottom of the package. After the fetal membrane is prepared, it is processed and cleaned. After that, a mixture of graphite and waste oil is applied as a release agent;

[0041] S3: Prepare dry materials, mix aggregates and powders in a specific proportion, add binders and mix thoroughly. These steps are conducive to the subsequent material bonding, avoid impurities affecting the construction quality, enhance the structural integrity of the permanent layer, prevent problems during use, ensure the normal function of the tundish, ensure the demoulding effect, improve construction efficiency and product quality, and avoid the use of wet processes, saving energy consumed in construction.

[0042] The purpose of step one is to achieve this:

[0043] Use a soft-bristle brush and a small vacuum cleaner to thoroughly remove the residue and dust attached to the surface of the permanent layer. For some corners and gaps that are difficult to clean, you can use a slender cleaning tool or a high-pressure air gun to clean them to ensure that there are no residual impurities. Carefully check each part of the permanent layer and mark the locally damaged parts. For the damaged parts, take different repair measures according to the degree of damage. If the damaged area is small, you can use repair materials. After the repair materials are prepared, apply them evenly to the damaged area, and use a spatula to compact and smooth them to ensure that the repaired area is smoothly connected with the surrounding intact parts. If the damaged area is large, you need to first remove the damaged part, re-support the formwork and pour the corresponding repair material. After it is completely solidified, proceed with subsequent construction.

[0044] Select the type of gas as coke oven gas, the calorific value of the gas is 18GJ / kM 3 , the gas pressure value is 0.6MPa, the combustion medium is air, the combustion method is forced blast, the baking temperature is between 350-400℃, the baking time is about 2 hours, the cooling method is forced blast cooling, and PLC control is used during baking. The working layer thickness of the finished tire membrane reaches 90mm for the steel area wall, 60mm for the non-steel area wall, and 60mm for the bottom of the tire mold. Before use, its outer surface is strictly inspected. If unevenness, protrusions or depressions are found, use sandpaper, files and other tools to polish it so that the outer surface reaches the standard of flatness and smoothness. Place the cleaned tire mold in a well-ventilated and clean place, use a clean rag to dip an appropriate amount of detergent, wipe the outer surface again to ensure that there is no oil stains, water stains and other impurities remaining, then use graphite and waste oil to stir and mix to form a release agent, use a brush to evenly apply the release agent on the outer surface of the tire mold, and ensure that there are no missing parts when applying, so as to facilitate the demolding operation after the subsequent dry material construction is completed.

[0045] According to the construction design requirements, accurately weigh the required aggregates and powders, pour the weighed aggregates and powders into professional mixing equipment for preliminary mixing and stirring so that the aggregates and powders can be evenly distributed, add binders to the evenly stirred aggregate and powder mixture, start the mixing equipment again, and continue stirring. During this period, the stirring can be appropriately paused to observe the mixing of the materials. If necessary, manually assist in turning the materials to ensure that the binder is fully integrated with the aggregates and powders, and finally obtain dry materials with uniform texture and stable performance for subsequent construction use.

[0046] During the bottom construction process of the step 2, the level of the water outlet seat brick of the middle ladle is ensured when it is installed, and a woven bag is inserted into the inner hole of the seat brick to prevent leakage and clogging of the water outlet. After the dry material is evenly poured into the bottom of the ladle according to the designed thickness, it is leveled with a shovel and then flattened with a tamping tool. The construction height is slightly higher than the upper surface of the water outlet seat brick to ensure the level and prevent poor drainage of the water outlet, thereby ensuring smooth subsequent use. The anti-leakage treatment can prevent materials from clogging the water outlet, maintain normal production order, and prevent local differences from affecting the construction quality. The initial leveling makes the thickness of the dry material in each place consistent, and the material is flattened and the construction height is controlled in sequence, which can reserve settlement space, ensure the overall bottom construction quality, and ensure construction safety and quality.

[0047] During the step three of installing the mold and the partition, a standard thickness mold is placed in the middle position between the impact zone and the steel casting zone, the roaster mold is lifted and placed in the tundish to fit the mold, and a movable partition is installed at the boundary between the impact zone and the steel casting zone to ensure that there is no gap between the partition and the mold and the permanent lining. This can ensure the overall installation accuracy, allow the molds to fit closely, ensure the installation quality, avoid gaps affecting use, achieve seamless installation of the partition, and prevent problems such as material leakage.

[0048] During the side wall construction process of step 4, a crane is used to lift the ton bag of dry material for the working lining of the impact zone to the tundish, the discharge port is opened, and the material is poured evenly while moving. After one side of the tundish wall is filled, the other side is constructed. The same method is used to pour the dry material for the working lining of the steel zone, so that the dry material of the tundish wall is filled evenly and the thickness meets the standard, which can ensure the quality of the side wall construction and facilitate the normal use of the tundish.

[0049] The above purpose is achieved as follows:

[0050] Carefully place the nozzle seat brick to the predetermined position, use a level to measure from multiple directions, and fine-tune the position of the seat brick to ensure that it is in an absolutely horizontal state to avoid problems such as poor drainage of the nozzle during subsequent use. Select a clean, tightly packed woven bag of suitable size to insert into the inner hole of the seat brick. When inserting, pay attention to filling the woven bag as much as possible so that it can fit tightly to the inner hole wall to effectively prevent the material in the tundish from leaking into the nozzle during subsequent construction and use, thereby causing blockage. Slowly and evenly pour the prepared dry material into the bottom of the bag. During the pouring process, the dry material should be dispersed as much as possible to avoid local accumulation of too high or too low. Use a shovel to level the poured dry material. Try to keep it steady and gentle when operating the shovel. Start from one end of the bottom of the bag and gradually push toward the other end to roughly scrape the surface of the dry material so that the thickness of the dry material is basically the same everywhere. Use a tamping tool to start from the edge of the bottom of the bag and flatten the dry material in a certain order, such as pushing spirally toward the center, so that it is slightly higher than the upper surface of the nozzle seat brick, and the height should be controlled at 5-10mm.

[0051] Lift the standard thickness mold to the middle position between the impact zone and the steel casting zone, slowly lower it, and accurately place the mold in place according to the pre-marked placement reference line. After placement, use a level meter and other tools to check the levelness of the mold again. If any tilt is found, make fine adjustments in time to ensure that the mold is level and the position is accurate. After lifting the mold above the tundish, slowly lower the mold according to the placed mold position. During the lowering process, constantly fine-tune the position of the mold so that all parts can fit tightly with the mold. After fitting, use a feeler gauge and other tools to check the gap at the fitting. The gap width should be controlled to a minimum value, such as less than 1mm. If the gap is too large, the mold position needs to be readjusted until the fitting standard is met. It is required to lift the movable partition to above the boundary between the impact zone and the steel pouring zone, and slowly lower it so that the bottom edge of the partition contacts the bottom of the ladle first, and then gradually adjust the verticality of the partition. Vertical benchmarks can be set on both sides of the partition for comparison and reference to ensure that the partition is placed vertically. Starting from one end of the partition, gradually push the partition to the other end to make it contact with the mold and the permanent lining. During the contact process, use thin iron sheets and other tools to assist in adjustment to ensure that the contact between the partition and the mold and the permanent lining is tight and there is no gap. After the fitting is completed, use a strong flashlight to illuminate from one side and observe whether there is light transmittance on the other side to check whether there is a gap. If there is light transmittance, further adjust the position of the partition until there is no gap at all.

[0052] Use a crane to steadily lift the ton bag of dry material for the working lining of the impact zone to the predetermined position above the tundish, keep the ton bag stable, slowly open the discharge port, operate the crane to make the ton bag start to move slowly along one side of the bag wall while evenly pouring the dry material, the moving speed should be moderate and maintained at a uniform speed, and during the pouring process, arrange a special person to use tools, such as a long-handled rake, etc., to properly guide the poured dry material so that it can fill the bag wall more evenly to avoid local accumulation or vacancies. When one side of the bag wall is filled, close the discharge port, lift the ton bag to the other side, and construct the other side of the bag wall in the same way to ensure that the dry material filling effect of the two sides of the bag wall is consistent and the thickness is uniform. Lift the ton bag to the top of the tundish, open the discharge port, and evenly pour the dry material while moving along the bag wall of the steel casting area. Pay attention to the guidance of the dry material during the process, fill one side of the bag wall before constructing the other side, to ensure that the construction quality of the working lining dry material of the entire steel casting area meets the requirements, and the filling is uniform and the thickness meets the standards.

[0053] During the vibration and leveling process in step five, the movable partition and the standard thickness mold are pulled out, the baking machine is turned on to automatically vibrate for 20 seconds to 30 seconds, and then the surface of the casting material is scraped flat. This can ensure that the partition and the mold are lifted steadily to avoid collision and scratching, which is beneficial for subsequent storage and maintenance, making the casting material more dense and uniform, ensuring smooth vibration, and improving the quality of the casting material. The scraping operation can make the surface flat, control height errors, avoid damaging the dense casting material, and is beneficial for subsequent processes.

[0054] During the baking and curing process described in step 6, turn on the automatic baker on the mold, set the baking time to 90 minutes-150 minutes, the maximum temperature to 300℃-380℃, the heating rate to 8℃ / min-12℃, and the cooling time to 120 minutes-180 minutes, which can ensure that the casting material is fully cured and the curing quality is ensured.

[0055] After the automatic baking is completed in the demoulding and subsequent processing of step seven, the baking machine mold is pulled out vertically by a crane to avoid bumping into the working lining. The slag retaining wall is installed as needed. The vertical pulling out operation is standardized, which is conducive to smooth and complete demoulding. The subsequent lifting, storage and maintenance are conducive to the recycling of the mold.

[0056] The above purpose is achieved as follows:

[0057] Use lifting tools to carefully hook the pre-set lifting points on the movable partition and the standard thickness mold. When lifting, operate the lifting equipment to lift upward slowly and evenly. During the process, arrange special personnel to closely observe the lifting status of the partition and the mold to ensure their smooth rise and avoid scratching and collision with other parts of the tundish. Turn on the automatic vibrator of the baker through the control button, and set the vibration time accurately within the range of 20 seconds to 30 seconds. The appropriate specific vibration duration can be selected according to the actual filling situation of the casting and on-site experience. For example, if the casting is relatively densely filled, you can choose a vibration time of about 25 seconds to scrape off the excess part of the casting surface to make the surface as smooth as possible. During the scraping process, pay attention to keeping the angle between the scraper and the casting surface appropriate, generally controlled at about 30°-45°.

[0058] According to the process requirements, the baking time is accurately set between 90 minutes and 150 minutes in the control system of the baker. The specific duration can be determined comprehensively according to factors such as the type and thickness of the casting material and the on-site environment. For example, for a thicker casting material layer, the baking time can be appropriately extended to about 120 minutes, and the maximum temperature can be set between 300℃-380℃. It should also be adjusted according to the actual situation. If the casting material is highly sensitive to temperature, a maximum temperature of about 320℃ can be selected, and the heating rate can be set to 8℃ / min-12℃ / min. Generally, the initial heating can be slightly slower, and the speed can be appropriately increased when approaching the maximum temperature. It can be flexibly adjusted according to the actual situation. After completing the parameter setting, press the start button to turn on the automatic baker and start the baking and curing process.

[0059] After the automatic baking is completed and the temperature of the tundish is reduced to a suitable range, generally controlled at around 50℃-80℃, to avoid scalding the operator due to excessive temperature and to prevent the working lining from being damaged due to unstable strength caused by excessive temperature. The hook is tightly connected to the lifting point of the mold to ensure that the lifting force is evenly distributed on the mold. During the lifting process, the crane hook is kept vertically lifted upward, and the speed is controlled at a uniform and slow state. Generally, the lifting speed is controlled at around 5cm / s-10cm / s. At the same time, a special person is arranged to closely observe the process of mold extraction, and pay attention to the separation between the mold and the working lining. If any abnormal phenomena such as jamming and adhesion are found, stop lifting immediately and take corresponding measures, such as gently shaking the mold, applying release agent again, etc. to avoid bumping the working lining due to forced lifting, and ensure that the mold can be smoothly and completely pulled out vertically from the tundish.

[0060] Determine whether it is necessary to install a slag retaining wall device based on demand. If necessary, first check the appearance of these devices to see if they have quality problems such as deformation and damage. During installation, lift the slag retaining wall device to the top of the corresponding position according to the pre-marked installation position in the tundish, and slowly lower it so that the bottom of the device fits well with the bottom of the tundish or the surface of the working lining. Use suitable connecting bolts, nuts and other connecting parts, and tighten and install them according to the specified torque requirements to ensure that the device is installed firmly and stably, and will not loosen or shift during subsequent use. After the installation is completed, check again whether the installation position of the device is accurate and whether the connection with the surrounding components is tight and seamless to ensure that it can normally perform functions such as slag retaining.

[0061] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for constructing a working layer of a middle-package dry material for continuous casting, characterized in that: The following steps are involved: Step 1: Preparation before construction: clean the permanent layer of the tundish, prepare the fetal membrane, and prepare dry materials; Step 2: Ladle bottom construction: install the tundish water inlet seat bricks and pour the dry material into the ladle bottom; Step 3: Install the mold and partition: Place a standard thickness mold in the middle of the impact zone and the steel casting zone, and install a movable partition at the boundary between the impact zone and the steel casting zone; Step 4: Side wall construction: Use dry material to cast the wall in sequence; Step 5: Vibration and leveling: Pull out the movable partition, turn on the automatic vibrator, and then level the surface of the casting material; Step 6: Bake and solidify: Turn on the baker, set the time and temperature for baking; Step 7: Demolding and subsequent processing: Take out the baking utensils and install the slag retaining wall.

2. A method for constructing a working layer of a middle-package dry material for continuous casting according to claim 1, characterized in that: Step 1: Pre-construction preparation process The following steps are involved: S1: Clean the permanent layer of the tundish. It is necessary to remove the residue and dust of the permanent layer of the tundish, repair the local damaged parts, and ensure that its outer surface is flat and smooth; S2: prepare the fetal membrane, make the fetal membrane and inspect and clean it, and after cleaning, apply a mixture of graphite and waste oil as a release agent; S3: Prepare dry materials, mix aggregate and powder, add binder and stir evenly.

3. The method for constructing a working layer of a middle-package dry material for continuous casting according to claim 2, characterized in that: During the bottom construction process of the step 2, the level of the water outlet seat brick of the tundish is ensured when it is installed, and a woven bag is stuffed into the inner hole of the seat brick to prevent leakage and blockage of the water outlet. After the dry material is evenly poured into the bottom of the ladle, it is leveled with a shovel and then flattened with a tamping tool. The construction height is slightly higher than the upper surface of the water outlet seat brick.

4. A method for constructing a working layer of a middle-package dry material for continuous casting according to claim 3, characterized in that: During the step 3 of installing the mold and the partition, a standard thickness mold is placed in the middle of the impact zone and the steel casting zone, the roaster mold is lifted and placed in the tundish to fit the mold, and a movable partition is installed at the boundary between the impact zone and the steel casting zone to ensure that there is no gap at the contact between the partition and the mold and the permanent lining.

5. A method for constructing a working layer of a middle-package dry material for continuous casting according to claim 4, characterized in that: During the side wall construction process of step 4, a crane is used to lift the ton bag of dry material for the working lining of the impact zone to the tundish, the discharge port is opened, and the material is poured evenly while moving. After filling one side of the bag wall, the other side is constructed. The same method is used to pour the dry material for the working lining of the steel zone.

6. A method for constructing a working layer of a middle-package dry material for continuous casting according to claim 5, characterized in that: During the vibration and leveling process in step 5, the movable partition and the standard thickness mold are pulled out, the baking machine is turned on to automatically vibrate for 20 seconds to 30 seconds, and then the surface of the casting material is leveled.

7. A method for constructing a working layer of a middle-package dry material for continuous casting according to claim 6, characterized in that: During the baking and curing process in step 6, the automatic baker on the mold is turned on, the baking time is set to 90 minutes to 150 minutes, the maximum temperature is set to 300°C to 380°C, the heating rate is set to 8°C / min-12°C, and the cooling time is 120 minutes to 180 minutes.

8. A method for constructing a working layer of a middle-package dry material for continuous casting according to claim 7, characterized in that: After the automatic baking is completed in the demoulding and subsequent processing of step seven, the baking machine mold is pulled out vertically by a crane to avoid bumping against the working lining, and the slag retaining wall is installed.

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