High temperature melt delivery ladle quick opening method

Abstract

This invention discloses a rapid opening method for high-temperature melt conveying ladles in the field of metal smelting technology, comprising the following steps: S1: Equipment screening: Install a baking flange at the baking furnace opening; S2: Ladle pretreatment: Transport the cold ladle to the baking furnace station and remove the blind flange of the siphon pipe interface; S3: Split baking: Lift the crucible from the ladle and place it in the baking furnace, aligning the crucible flange with the baking flange and connecting the crucible grounding wire; S4: Gradient heating: Start the heaters in each baking zone, first baking at a preset temperature for a preset time, then heating and baking for a preset time; S5: Sealing reinforcement: After baking, tighten the sealing bolts between the crucible and the cover after power is cut off; S6: Rapid integration: Lift the crucible into the ladle shell and then install the dried siphon pipe; S7: Direct discharge: Connect the assembled ladle to the electrolytic cell discharge system; The overall process can effectively reduce energy consumption and process time, improve work efficiency, and reduce costs.

Description

Technical Field

[0001] This invention relates to the field of metal smelting technology, and in particular to a method for rapid opening of a ladle for conveying high-temperature melt. Background Technology

[0002] High-temperature molten metal ladle is a key piece of equipment in the metallurgical industry used to hold and transfer liquid metal at 800℃–1600℃. Opening the ladle refers to the preparatory operation before opening the ladle cover and pouring out the molten metal after transportation or settling, involving core aspects such as temperature control, confirmation of the condition of the seals, and environmental isolation. Traditional ladle opening requires placing the entire ladle in a furnace for baking, which is energy-intensive and time-consuming, thus increasing costs. Summary of the Invention

[0003] To overcome the shortcomings of the prior art, the technical problem to be solved by the present invention is: how to improve the problem of the high time and energy consumption in the process of lifting and opening the high temperature melt in the prior art.

[0004] The technical solution adopted by this invention to solve its technical problem is: A method for rapid opening of a high-temperature melt conveying ladle includes the following steps: S1: Equipment selection: Install baking flanges at the oven opening; S2: Pre-treatment of lifting package: Transport the cold lifting package to the baking oven station and remove the blind flange of the siphon pipe interface; S3: Split-type baking: Lift out the crucible from the lifting bag and place it in the baking oven, so that the crucible flange is connected to the baking flange, and connect the crucible grounding wire; S4: Gradient heating: Start the heaters in each baking zone, first bake at the preset temperature for the preset time, then increase the temperature and bake for the preset time; S5: Sealing Enhancement: After baking, tighten the sealing bolts between the crucible and the lid after power is turned off; S6: Rapid integration: Hoist the crucible into the outer shell of the lifting bag, and then install the dried siphon tube; S7: Direct discharge: Connect the assembled package to the electrolytic cell discharge system.

[0005] Furthermore, in step S4, the temperature is first set at 400℃-550℃ for a preset time, and then the temperature is increased to 850℃-950℃ for a preset time.

[0006] Furthermore, bake at a temperature range of 400℃-550℃ for 1-3 hours, and then increase the temperature to 850℃-950℃ for 4-6 hours.

[0007] Furthermore, in step S4, the material in the crucible is heated and baked for a preset time until the material is completely melted and the inner wall of the crucible is completely red-hot.

[0008] Furthermore, an infrared thermal imager is used to monitor the melting state of the material in real time. When the internal temperature of the crucible is ≥850℃ and continues for ≥1 hour, the melting is considered complete.

[0009] Furthermore, in step S5, the sealing bolts are tightened using a cross-symmetric pressure method, with the torque gradient increasing to 120% or more of the design value.

[0010] Furthermore, in step S6, the drying step of the siphon tube includes: pre-baking at a temperature range of 100℃-150℃ for 2h-3h, so that the moisture content of the siphon tube is ≤0.1%.

[0011] The beneficial effects of this invention are: The process breaks down the bale into a crucible (main heating element) and an outer shell (non-heating element), reducing ineffective heat load and the need for routine bale washing. Furthermore, a variable-temperature melting control process is implemented: the heaters in each baking zone are activated, first baking at a preset temperature for a preset time, then increasing the temperature and baking for another preset time. The initial baking stage removes water of crystallization, while the heating stage achieves low-superheat melting of the material and rapidly increases the internal temperature of the crucible. An independent drying siphon avoids localized overheating caused by simultaneous baking with the crucible and effectively removes moisture. The overall process effectively reduces energy consumption and processing time, improves work efficiency, and lowers costs. Attached Figure Description

[0012] Figure 1 This is a flowchart of the process method of the present invention; Figure 2 This is a schematic diagram of the bag-lifting device of the present invention. Figure 1 ; Figure 3 This is a schematic diagram of the bag-lifting device of the present invention. Figure 2 ; The diagram is labeled as follows: 1-lifting bag, 2-crucible, 3-large cover, 4-crucible flange. Detailed Implementation

[0013] The invention will be further described below with reference to the accompanying drawings.

[0014] like Figures 1-3 As shown, this application proposes a method for rapid unloading of a high-temperature melt conveying ladle, comprising the following steps: S1: Equipment Selection: Install baking flanges at the oven opening; specifically, select baking ovens with normal resistance wire function in each zone, and install baking-specific flanges at the oven opening flanges; S2: Pre-treatment of lifting bag 1: Transport the cold lifting bag 1 to the baking oven station and remove the blind plate of the siphon pipe interface; S3: Split-type baking: Lift out the crucible 2 from the lifting bag 1 and place it in the baking oven, so that the crucible flange 4 is connected to the baking flange, and connect the crucible 2 grounding wire; S4: Gradient Heating: Start the heaters in each baking zone, first baking at a preset temperature for a preset time, then baking for a preset time after increasing the temperature; continue baking for a preset time after increasing the temperature until the material in crucible 2 is completely melted and the inner wall of crucible 2 is completely red-hot, ensuring the complete melting state of the high-temperature melt. First, bake for a preset time at a temperature range of 400℃-550℃ to remove the water of crystallization; then heat to a temperature range of 850℃-950℃ and bake for a preset time, achieving low superheat melting of the material and rapidly increasing the internal temperature of crucible 2 at the 850-950℃ stage.

[0015] Specifically, bake at a temperature range of 400℃-550℃ for 1-3 hours to ensure complete removal of crystal water and improve baking effect; then raise the temperature to 850℃-950℃ and bake for 4-6 hours to ensure complete melting of the material at low superheat, thus improving the melting state of the high-temperature melt during the unpacking process.

[0016] Furthermore, an infrared thermal imager is used to monitor the melting state of the material in real time. When the internal temperature of crucible 2 is ≥850℃ and continues for ≥1 hour, the melting is determined to be complete.

[0017] S5: Sealing Enhancement: After baking, tighten the sealing bolts between crucible 2 and lid 3 after power is turned off; the sealing bolts are tightened using a cross-symmetric pressure method, with the torque gradient increasing to ≥120% of the design value to ensure the sealing effect inside crucible 2.

[0018] S6: Rapid integration: Suspend crucible 2 into the outer shell of lifting bag 1, and then install the dried siphon tube; The drying steps of the siphon tube include: pre-baking at a temperature range of 100℃-150℃ for 2h-3h, so that the moisture content of the siphon tube is ≤0.1%, and drying the siphon tube independently avoids local overheating caused by simultaneous baking with crucible 2 and achieves the purpose of removing moisture from the siphon tube.

[0019] S7: Direct discharge: Connect the assembled lifting package 1 to the discharge system of the electrolytic cell.

[0020] Example 1 The furnace consists of a 2.5-ton high-temperature melt ladle and two crucibles (material: 304 stainless steel), with a power density of 100kW / m².

[0021] S1: Equipment selection: Install a baking flange at the oven opening.

[0022] S2: Pre-treatment of lifting package 1: Transport the cold lifting package 1 to the baking oven station and remove the blind plate of the siphon pipe interface.

[0023] S3: Split-type baking: Lift out the crucible 2 from the lifting bag 1 and place it in the baking oven, so that the flange of crucible 2 is connected to the baking flange, and connect the grounding wire of crucible 2.

[0024] S4: Gradient heating: Start the heaters in each baking zone, bake at 400-550℃ for 1 hour, then bake at 850-950℃ for 4 hours until the material in crucible 2 is completely melted and the inner wall of crucible 2 is completely red-hot.

[0025] S5: Sealing Enhancement: After baking is complete, immediately tighten the sealing bolts between the crucible 2 and the large cover 3 after power is turned off.

[0026] S6: Rapid integration: Suspend crucible 2 into the outer shell of lifting bag 1, and then install the pre-baked dry siphon tube. The temperature of the siphon tube after pre-baking is ≥60℃.

[0027] S7: Direct discharge: Connect the assembled lifting package 1 to the discharge system of the electrolytic cell.

[0028] After the above process is completed, the total opening time is 5.2 hours, which saves 43% energy compared to the traditional method.

[0029] Example 2 The furnace consists of a 4-ton high-temperature melt ladle, two crucibles (material: 304 stainless steel), and a baking furnace power density of 100kW / m².

[0030] S1: Equipment selection: Install a baking flange at the oven opening.

[0031] S2: Pre-treatment of lifting package 1: Transport the cold lifting package 1 to the baking oven station and remove the blind plate of the siphon pipe interface.

[0032] S3: Split-type baking: Lift out the crucible 2 from the lifting bag 1 and place it in the baking oven, so that the flange of crucible 2 is connected to the baking flange, and connect the grounding wire of crucible 2.

[0033] S4: Gradient heating: Start the heaters in each baking zone, bake at 400-550℃ for 1.5 hours, then bake at 850-950℃ for 5 hours until the material in crucible 2 is completely melted and the inner wall of crucible 2 is completely red-hot.

[0034] S5: Sealing Enhancement: After baking is complete, immediately tighten the sealing bolts between the crucible 2 and the large cover 3 after power is turned off.

[0035] S6: Rapid integration: Suspend crucible 2 into the outer shell of lifting bag 1, and then install the pre-baked dry siphon tube; the temperature of the siphon tube after pre-baking is ≥60℃.

[0036] S7: Direct discharge: Connect the assembled lifting package 1 to the discharge system of the electrolytic cell.

[0037] After the above process is completed, the total opening time is 6.7 hours, which saves 39% energy compared to the traditional method.

[0038] Example 3 The furnace consists of a 6-ton high-temperature melt ladle, two crucibles (material: 310S stainless steel), and a baking furnace power density of 100kW / m².

[0039] S1: Equipment selection: Install a baking flange at the oven opening.

[0040] S2: Pre-treatment of lifting package 1: Transport the cold lifting package 1 to the baking oven station and remove the blind plate of the siphon pipe interface.

[0041] S3: Split-type baking: Lift out the crucible 2 from the lifting bag 1 and place it in the baking oven, so that the flange of crucible 2 is connected to the baking flange, and connect the grounding wire of crucible 2.

[0042] S4: Gradient heating: Start the heaters in each baking zone, bake at 400-550℃ for 2 hours, then bake at 850-950℃ for 5 hours until the material in crucible 2 is completely melted and the inner wall of crucible 2 is completely red-hot.

[0043] S5: Sealing Enhancement: After baking is complete, immediately tighten the sealing bolts between the crucible 2 and the large cover 3 after power is turned off.

[0044] S6: Rapid integration: Suspend crucible 2 into the outer shell of lifting bag 1, and then install the pre-baked dry siphon tube; the temperature of the siphon tube after pre-baking is ≥60℃.

[0045] S7: Direct discharge: Connect the assembled lifting package 1 to the discharge system of the electrolytic cell.

[0046] After the above process is completed, the total opening time is 7.2 hours, which saves 35% energy compared to the traditional method.

[0047] In summary, this invention proposes a rapid opening method for high-temperature melt conveying ladle. Through a combined process of gradient baking of a split crucible 2 and pre-installation of a siphon, it solves the problems of discharge delay and ladle blockage caused by material solidification during the opening of the cold ladle 1. The method includes: screening baking furnaces with functional resistance wires in each zone; disassembling the ladle 1 into an outer shell and crucible 2 module for independent hoisting; employing a two-stage variable-temperature baking process: the first stage at 400-550℃ for 1-3 hours, and the second stage at 850-950℃ for 4-6 hours, achieving simultaneous material melting and sealing; after baking, directly assembling the ladle 1 into its outer shell, preheating and drying the siphon, and connecting it to the discharge system. Compared to traditional methods, the opening time is reduced by more than 40%, avoiding energy waste caused by repeated heating, and is suitable for conveying magnesium chloride and liquid materials.

Claims

1. A method for rapid opening of a high-temperature melt conveying ladle, characterized in that, Includes the following steps: S1: Equipment selection: Install baking flanges at the oven opening; S2: Pre-treatment of lifting package (1): Transport the cold lifting package (1) to the baking oven station and remove the blind plate of the siphon pipe interface; S3: Split-type baking: Lift out the crucible (2) inside the lifting bag (1) and place it in the baking oven, so that the crucible flange (4) is connected to the baking flange, and connect the crucible (2) grounding wire; S4: Gradient heating: Start the baking heater, first bake at the preset temperature for a preset time, then increase the temperature and bake for a preset time; S5: Sealing reinforcement: After baking, tighten the sealing bolts between the crucible (2) and the lid (3) after power is turned off; S6: Rapid integration: Hang the crucible (2) into the outer shell of the lifting bag (1), and then install the dried siphon tube; S7: Direct discharge: Connect the assembled lifting package (1) to the discharge system of the electrolytic cell.

2. The method for rapid opening of a high-temperature melt conveying ladle according to claim 1, characterized in that, In step S4, the oven is first baked for a preset time at a temperature range of 400℃-550℃, and then the temperature is increased to a preset time at a temperature range of 850℃-950℃.

3. The method for rapid opening of a high-temperature melt conveying ladle according to claim 2, characterized in that, Bake at a temperature range of 400℃-550℃ for 1-3 hours, then increase the temperature to 850℃-950℃ and bake for 4-6 hours.

4. The method for rapid opening of a high-temperature melt conveying ladle according to claim 1, characterized in that, In step S4, the material in the crucible (2) is heated and baked for a preset time until the material is completely melted and the inner wall of the crucible (2) is completely red-hot.

5. The method for rapid opening of a high-temperature melt conveying ladle according to claim 4, characterized in that, The melting state of the material is monitored in real time using an infrared thermal imager. When the internal temperature of the crucible (2) is ≥850℃ and the duration is ≥1h, the melting is considered complete.

6. The method for rapid opening of a high-temperature melt conveying ladle according to claim 1, characterized in that, In step S5, the sealing bolts are tightened using a cross-symmetric pressure method, with the torque gradient increasing to ≥120% of the design value.

7. The method for rapid opening of a high-temperature melt conveying ladle according to claim 1, characterized in that, In step S6, the drying step of the siphon tube includes: pre-baking at a temperature range of 100℃-150℃ for 2h-3h, and completing the drying process after detecting that the moisture content of the siphon tube is ≤0.1%.

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