Method for improving the sintering effect of a neutral lining material on a furnace lining

Abstract

The application discloses a method for improving sintering effect of a neutral furnace lining material, and comprises the following steps: S1, designing an arc-shaped furnace heating steel block; S2, manufacturing a furnace heating steel wood mold; S3, manufacturing a furnace heating steel resin sand mold, and obtaining independent mold furnace heating steel blocks; S4, when heating the furnace, the furnace heating steel blocks are closely arranged on the crucible wall from the bottom to the top, and then the furnace charging material or small pieces of scrap steel are put into the inner cavity; S5, after the temperature is kept at 1000 DEG C, the molten steel with a temperature of 1600-1650 DEG C is added from another furnace, until the liquid surface rises to 2 / 3 of the height of the furnace chamber, then the power is increased, and the scrap steel is timely added until the furnace is full, after the furnace is full, the temperature is increased to 1700 DEG C, and then the temperature is kept for a period of time, then the continuous smelting furnace is used, after smelting is completed, the empty molten steel is discharged, and then the furnace cover is covered to slowly cool down. The application makes the sintered furnace wall smooth, without pits and cracks, prolongs the service life of the furnace lining, reduces the material and labor loss, and reduces the risk of furnace penetration. Moreover, the structure is simple, the method is simple and easy to operate.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of furnace baking process, in particular to a method for improving the baking furnace lining sintering effect of neutral furnace lining material. BACKGROUND

[0002] The neutral furnace lining has high refractoriness, less furnace lining erosion during smelting, good material chemical stability, and no chemical reaction with metal elements in the molten steel, so it is often used in alloy steel smelting. However, the furnace lining is not easy to sinter, and in the general furnace lining sintering process (such as shown in the figure), the baking material added is blocky, flaky, polygonal, or scrap steel, the baking material shape is various, the stacking is not dense, the baking crucible is easy to form point contact, and the concentrated discharge phenomenon occurs, under the action of discharge, the baking crucible (thickness 3-5mm) is locally broken down, forming a broken hole with a width of 10-15mm and a length of 50-150mm. At the position where the crucible is broken and forms a cavity, the furnace lining material has not been completely sintered and is in a dispersed state, loses the support of the baking crucible, and the furnace lining material will leak out of the broken hole, and the leakage position will inevitably form a pit after sintering, reducing the effective thickness of the furnace lining; at the same time, because of the leakage of the neutral furnace lining material, the overall density of the furnace lining is also destroyed, resulting in a decrease in the strength of the furnace lining. The service life of the furnace lining sintered by the traditional process is very short, the minimum is only 30 heats, causing a large amount of material and labor loss, and also accompanied by an increase in the risk of furnace penetration. The traditional process furnace lining sintering process chart is shown in the figure Figure 1 Figure 1 SUMMARY In view of the above problems, the present application provides a method for improving the baking furnace lining sintering effect of neutral furnace lining material.

[0003] To achieve the above purpose, the present application adopts the following technical scheme:

[0004] A method for improving the baking furnace lining sintering effect of neutral furnace lining material, comprising the following steps:

[0005] S1, design an arc-shaped baking steel block, the arc surface size is matched with the diameter size of the crucible;

[0006] S2, make a baking steel wood mold, the baking steel wood molds are connected through flow channels;

[0007] S3, make a baking steel resin sand mold, store it in the pouring area, pour the tail water of daily pouring into the sand mold, and after cooling, box and shot blasting, and the connected flow channels are removed by gas cutting, to obtain independent type baking steel blocks;

[0008] S4, during baking, the baking steel blocks are tightly stacked against the crucible wall from the bottom to the top, and then the re-melting material or small scrap steel is put into the inner cavity;

[0009]

[0010] ​S5, after the temperature keeping at 1000 DEG C, the molten steel at 1600-1650 DEG C is added from another furnace, until the liquid level rises to 2 / 3 of the height of the hearth, then the power is raised, and scrap steel is added in time until the furnace is full, after the furnace is full, the temperature is raised to 1700 DEG C and kept for a period of time, then the molten steel is tapped and poured, after the first sintering, continuous smelting of no less than 4 furnaces is required, after the shift smelting is completed, the empty molten steel is discharged, and then the furnace cover is covered and slowly cooled.

[0011] As a preferred embodiment of the above scheme, in step S1, the weight of the oven steel block is no more than 5 kg.

[0012] As a preferred embodiment of the above scheme, in step S2, the oven steel wood mold adopts a 1-type 20-piece layout, and each piece is connected through a 20*30 runner.

[0013] As a preferred embodiment of the above scheme, in step S4, the oven steel block is stacked in 2 layers from the bottom to the top of the furnace.

[0014] As a preferred embodiment of the above scheme, in step S5, the temperature is raised to 1700 DEG C and kept for 2 hours.

[0015] Due to the above structure, the beneficial effects of the present application are as follows:

[0016] The present application adjusts the sintering parameters through the steps of designing the arc oven steel block, making an independent type oven steel block, and the like, so that the sintered furnace wall is smooth without pits and cracks, effectively solving the problem that in the background art, the furnace charge is easy to contact the crucible and easy to produce a discharge phenomenon, resulting in the problem of the crucible being punctured, prolonging the service life of the furnace lining, reducing material and labor loss, and reducing the risk of furnace penetration. Moreover, the structure is simple, the method is simple and easy to operate. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiment description.

[0018] Figure 1 It is a structural schematic diagram of the traditional process;

[0019] Figure 2 It is a structural schematic diagram of the present application;

[0020] Figure 3 It is a method flowchart of the present application;

[0021] Figure 4 It is a structural schematic diagram of the arc oven steel block of the present application;

[0022] Figure 5 It is a structural schematic diagram of the oven steel wood mold of the present application;

[0023] Figure 6This is a schematic diagram of the structure of the resin sand mold for the baking furnace steel of the present invention;

[0024] Figure 7 This is a diagram showing the actual stacking of furnace iron in the crucible according to the present invention;

[0025] Figure 8 This is an image showing the effect of the furnace lining after sintering according to the present invention. Detailed Implementation

[0026] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0027] like Figure 2 As shown, this embodiment provides a method for improving the sintering effect of neutral furnace lining during baking, including the following steps (such as...). Figure 3 As shown):

[0028] S1, Design of arc-shaped furnace steel blocks (such as...) Figure 4 As shown), the weight of a single piece is no more than 5kg, making it convenient for manual stacking;

[0029] S2. Make the steel and wood mold for the baking oven, such as Figure 5 As shown, the steel-wood mold for the baking oven adopts a 20-piece layout of type 1, with each piece connected by a 20*30 flow channel;

[0030] S3, Making furnace steel resin sand molds (such as...) Figure 6 As shown), the wastewater from daily casting is poured into the sand mold, cooled, shot-blasted, and the connecting flow channels are removed by gas cutting to obtain individual molded furnace steel blocks.

[0031] S4. During furnace drying, the furnace steel blocks should be stacked tightly against the crucible wall, forming two concentric layers from the furnace bottom to the top. Then, recycled materials or small pieces of scrap steel should be placed inside the furnace cavity, stacked as follows: Figure 7 As shown;

[0032] S5. After holding at 1000℃, add molten steel at 1600-1650℃ from another furnace until the liquid level rises to 2 / 3 of the furnace height. Then increase the power and add scrap steel to fill the furnace as needed. Once the furnace is full, raise the temperature to 1700℃ and hold for 2 hours. Then tap out the steel and pour it into the furnace. After the first furnace is sintered, it must be continuously smelted for no less than 4 furnaces. After the smelting is completed on the shift, empty the molten steel and then cover the furnace with the lid to cool it slowly.

[0033] The effect diagram of the furnace wall after sintering is as follows: Figure 8 As shown, the furnace wall is smooth, without pits or cracks.

[0034] The above merely describes the preferred embodiments of the present application, and is not used to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for improving the sintering effect of neutral furnace lining during baking, characterized in that: Includes the following steps: S1. Design an arc-shaped furnace steel block, with the arc surface dimensions matching the crucible diameter. S2. Make oven steel and wood molds, and connect the oven steel and wood molds through flow channels; S3. Make a resin sand mold for furnace steel and store it in the casting area. Pour the tail water from daily casting into the sand mold. After cooling, shot blast the mold and remove the connecting flow channels by gas cutting to obtain individual furnace steel blocks. S4. When drying the furnace, the steel blocks are placed tightly against the crucible wall from the bottom to the top of the furnace, and then recycled materials or small pieces of scrap steel are put into the inner cavity. S5. After holding at 1000℃, add molten steel at 1600-1650℃ from another furnace until the liquid level rises to 2 / 3 of the furnace height. Then increase the power and add scrap steel to fill the furnace as needed. After the furnace is full, raise the temperature to 1700℃ and hold for a period of time. Then tap out the steel and pour it into the furnace. After the first furnace is sintered, it must be continuously smelted for no less than 4 furnaces. After the smelting is completed in the shift, empty the molten steel and then cover the furnace with the lid to cool it slowly. In step S1, the weight of a single furnace steel block shall not exceed 5 kg.

2. The method for improving the sintering effect of neutral furnace lining according to claim 1, characterized in that: In step S2, the oven steel-wood mold adopts a 20-piece layout of type 1, with each piece connected by a 20*30 flow channel.

3. The method for improving the sintering effect of neutral furnace lining according to claim 1, characterized in that: In step S4, the furnace steel blocks are stacked in two concentric layers from the bottom to the top of the furnace.

4. The method for improving the sintering effect of neutral furnace lining according to claim 1, characterized in that: In step S5, the temperature is raised to 1700℃ and then kept at that temperature for 2 hours.

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