Preparation method and gunning device of electric furnace lining gunning material

Abstract

The invention discloses a preparation method of an electric furnace lining gunning material and a gunning device thereof, and the preparation method comprises the following steps: 1, uniformly mixing fly ash and titanium-containing powder, and heating to a first temperature to obtain an initial material; 2, the initial material is subjected to heat preservation at the first temperature for 1.5-2.5 h and then naturally cooled to the room temperature, and a first material is obtained; and step 3, crushing the first material and preparing the first material into slurry to form the gunning material. According to the preparation method of the electric furnace lining gunning material and the gunning device of the electric furnace lining gunning material, the fly ash and the titanium-containing powder react at a high temperature to obtain TiC, magnesium aluminate spinel and perovskite, the three high-melting-point solid-phase substances have the characteristics of high corrosion resistance, high viscosity and the like at the same time, the three high-melting-point solid-phase substances are gunned to the damaged part of the furnace lining, and the damage to the damaged part of the furnace lining is avoided. The direct contact between the slag and the furnace lining can be effectively prevented, and the further melting loss and scouring consumption speed of the slag to the furnace lining is reduced, so that the service life of the furnace lining is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of titanium extraction from blast furnace slag, and in particular to a preparation method of an electric furnace lining gunning material and a gunning device thereof. Background Art

[0002] Panzhihua Iron and Steel uses AC electric furnaces with carbon to smelt titanium-containing blast furnace slag to extract TiO2 from the slag. This technology has been widely used since 2018. The service life of the AC electric furnace lining is relatively short. The reason is that the TiO2 contained in the titanium-containing blast furnace slag can react rapidly with aluminum, magnesium, carbon, magnesium-carbon and other refractory bricks at a smelting temperature of 1400-1700℃, resulting in a large amount of corrosion of the refractory bricks in the furnace lining.

[0003] In blast furnace maintenance, the traditional repair method is to manually clean the slag at the repair site, then manually deliver the repair material to the repair site, and then use tools to compact it. Manual repair requires stopping production and stopping the furnace for maintenance. The repair cost of re-bricking and lining is high, time-consuming and labor-intensive, and the production cost is high, so it has gradually been eliminated. Another repair method is to repair through a repair device, but the price of the repair material used is relatively high, and coupled with the construction cost, it increases the maintenance cost of the smelting enterprise.

[0004] Based on this, the existing technology still needs to be improved. Summary of the invention

[0005] To solve the above technical problems, an embodiment of the present invention proposes a method for preparing a gunning material for an electric furnace lining and a gunning device thereof, wherein the gunning material is gunned on the inner wall of the furnace lining to reduce the corrosion of the refractory bricks of the furnace lining by titanium-containing molten blast furnace slag, thereby extending the service life of the AC furnace lining.

[0006] In order to solve the above technical problems, some embodiments of the present invention disclose a method for preparing a gunning material for an electric furnace lining, comprising: Step 1: Evenly mix the dust removal ash and the titanium-containing powder and heat them to a first temperature to obtain an initial material; Step 2, keeping the initial material at the first temperature for 1.5 to 2.5 hours, and then naturally cooling to room temperature to obtain a first material; Step 3: crushing the first material and making it into slurry to form a gunning material.

[0007] In some embodiments, the dust removal ash includes: CaO, MgO, Al2O3 and C, in percentage by mass: C 40~60%, Al2O3 15~20%, CaO 8~15%, MgO 5~8%.

[0008] In some embodiments, the titanium-containing powder includes TiO2, and the content of TiO2 is not less than 70% by mass.

[0009] In some embodiments, the mass ratio is: titanium-containing powder: dust ash = 1:4~1:8.

[0010] In some embodiments, the first temperature is 1800±50°C.

[0011] In some embodiments, the first material is crushed into a particle size of 50 mesh to 150 mesh.

[0012] Some embodiments of the present invention further disclose a gunning device for the gunning operation of the above-mentioned gunning material, comprising: a scanning component, a gunning component and a lifting component, wherein: The lifting assembly includes a first lifting frame and a second lifting frame; The first lifting frame and the second lifting frame are located at the outlet end of the electric furnace; The scanning assembly is arranged on the first lifting frame; The spraying assembly is arranged on the second lifting frame.

[0013] In some embodiments, the first lifting frame is further provided with a first cooling mechanism, the first cooling mechanism comprising a partition wall and a shell. The partition wall divides the shell into a first cooling chamber and a second cooling chamber; The first cooling chamber is connected to the compressed air storage tank; The scanning assembly is located in the first cooling chamber; The second cooling cavity is wrapped around the outside of the first cooling cavity; The second cooling chamber is connected to the circulating water pipeline; The outer wall of the shell is coated with a high temperature resistant coating; The first cooling mechanism is also provided with a first through hole, and the first through hole penetrates from the first cooling cavity to the shell; The hole wall of the first through hole extends from the partition wall to the shell; The scanning component is arranged toward the first through hole.

[0014] In some embodiments, the spray repair assembly includes a fully automatic mechanical spray gun and a spray repair tank, and the feed port of the fully automatic mechanical spray gun is connected to the discharge port of the spray repair tank.

[0015] In some embodiments, the fully automatic mechanical spray gun includes a mounting base and a nozzle, the spraying angle of the nozzle is 360°, and the spraying range of the nozzle in the vertical direction is 3~4.5m; the pressure of the spray tank is 0.5~1Mpa.

[0016] By adopting the above technical solution, the present invention has at least the following beneficial effects: The present invention provides a method for preparing an electric furnace lining gunning material and a gunning device thereof. Dust removal ash is mixed with titanium-containing powder. The gunning material obtained by the reaction has the characteristics of high melting point, high viscosity and strong corrosion resistance. The gunning material is gunned on the inner wall of the furnace lining to form a "barrier layer" between the titanium-containing molten blast furnace slag and the refractory bricks of the furnace lining, thereby reducing the corrosion of the refractory bricks of the furnace lining by the titanium-containing molten blast furnace slag and extending the service life of the AC furnace lining. This technology uses a large amount of solid waste such as dust removal ash, has low cost, and has significant environmental benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 The present invention is a flowchart of a method for preparing an electric furnace lining gunning material disclosed in some embodiments of the present invention. DETAILED DESCRIPTION

[0019] The following is a further detailed description of the embodiments of the present disclosure in conjunction with the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to exemplarily illustrate the principles of the present disclosure, but cannot be used to limit the scope of the present disclosure. The present disclosure can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

[0020] The present disclosure provides these embodiments to make the present disclosure thorough and complete, and to fully express the scope of the present disclosure to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the parts and steps, the composition of the materials, the numerical expressions and the numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary, and not as limiting.

[0021] It should be noted that, in the description of the present disclosure, unless otherwise specified, the meaning of "multiple" is greater than or equal to two; the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicating the orientation or positional relationship, are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present disclosure. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0022] In addition, the words "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different parts. "Vertical" does not mean vertical in the strict sense, but is within the tolerance range. "Parallel" does not mean parallel in the strict sense, but is within the tolerance range. "Include" or "comprising" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements.

[0023] It should also be noted that in the description of the present disclosure, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to the specific circumstances. When a specific device is described as being located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device.

[0024] All terms used in the present disclosure have the same meanings as those understood by those of ordinary skill in the art to which the present disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries, for example, should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined as such herein.

[0025] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0026] like Figure 1 As shown, some embodiments of the present invention disclose a method for preparing an electric furnace lining gunning material, comprising: Step 1: Evenly mix the dust removal ash and titanium-containing powder and heat them to the first temperature to obtain the initial material. The dust removal ash includes: CaO, MgO, Al2O3, C, in terms of mass percentage: C 40-60%, Al2O315-20%, CaO 8-15%, MgO5-8%; the titanium-containing powder includes TiO2, and in terms of mass percentage, the content of TiO2 is not less than 70%, such as titanium dioxide, high titanium slag, titanium-rich materials and other titanium-containing raw materials; and in terms of mass ratio: titanium-containing powder: dust removal ash = 1:4-1:8; wherein the first temperature is 1800±50℃.

[0027] Step 2: Keep the initial material at the first temperature for 1.5 to 2.5 hours, and then cool it naturally to room temperature to obtain the first material. Ensure that the slag is gradually and slowly cooled to room temperature, and no rapid cooling measures should be added at this time to avoid the formation of high melting point solid phases such as magnesium aluminum spinel and perovskite.

[0028] Step 3: crush the first material to a particle size of 50-150 mesh, and make it into a slurry to form a gunning material.

[0029] Specifically, the C in the dust ash reacts with titanium-containing powder at high temperature to obtain TiC (melting point 3140±90℃); MgO and Al2O3 in the dust ash are remelted to obtain magnesium-aluminum spinel (melting point 2250℃); CaO in the dust ash and TiO2 powder are remelted and cooled to obtain perovskite (melting point 1940℃); in addition, the dust ash also includes a small amount of potassium and sodium oxides. The potassium and sodium vapor formed after potassium and sodium are heated helps the above three substances to adhere to the surface of the furnace lining. TiC, magnesium-aluminum spinel, and perovskite, three high-melting-point solid phases, have the characteristics of strong corrosion resistance and high viscosity. When they are sprayed on the damaged part of the furnace lining, they can effectively prevent the slag from directly contacting the furnace lining.

[0030] The preparation method of the electric furnace lining gunning material disclosed in the above embodiment is to mix dust removal ash with titanium-containing powder. The gunning material obtained by the reaction has the characteristics of high melting point, high viscosity and strong corrosion resistance. The gunning material is gunned on the inner wall of the furnace lining to form a "barrier layer" between the titanium-containing molten blast furnace slag and the refractory bricks of the furnace lining, thereby reducing the corrosion of the refractory bricks of the furnace lining by the titanium-containing molten blast furnace slag and extending the service life of the AC furnace lining.

[0031] Some embodiments of the present invention also disclose a gunning device, including: a scanning component, a gunning component and a lifting component, wherein the lifting component includes a first lifting frame and a second lifting frame; the first lifting frame and the second lifting frame are located at the outlet of the electric furnace; the scanning component is arranged on the first lifting frame; and the gunning component is arranged on the second lifting frame. In this embodiment, the scanning component and the gunning component are arranged at the outlet of the electric furnace through the lifting component, and the furnace lining can be scanned and repaired according to work needs to prevent the furnace lining from being corroded and damaged.

[0032] Some embodiments of the present invention disclose a spray repair device. On the basis of the above embodiments, a first lifting frame is further provided with a first cooling mechanism, the first cooling mechanism includes a partition wall and a shell, the partition wall divides the shell into a first cooling chamber and a second cooling chamber; the first cooling chamber is connected to a compressed air storage tank; the scanning assembly is located in the first cooling chamber; the second cooling chamber is wrapped around the outside of the first cooling chamber; the second cooling chamber is connected to a circulating water pipe; the outer wall of the shell is coated with a high-temperature resistant coating; the first cooling mechanism is also provided with a first through hole, the first through hole passes through the first cooling chamber to the shell; the hole wall of the first through hole extends from the partition wall to the shell; the scanning assembly is arranged toward the first through hole.

[0033] Since the spraying operation involves high temperature conditions, the first cooling chamber is connected to a compressed air storage tank, the scanning assembly is placed in the first cooling chamber, the second cooling chamber is wrapped around the outside of the first cooling chamber, and the second cooling chamber is connected to a circulating water pipeline, and a high-temperature resistant coating is applied to the outer wall of the shell. A triple cooling system of air cooling, water cooling and coating of high-temperature resistant coating is adopted to provide a combined temperature reduction protection for the scanning assembly to prevent burn damage to the scanning assembly caused by the high-temperature working environment, wherein the high-temperature resistant coating is a coating that can withstand at least 1200°.

[0034] Some embodiments of the present invention disclose a spray patching device, based on the above embodiments, the spray patching assembly may include a fully automatic mechanical spray gun and a spray patching tank, wherein the feed port of the fully automatic mechanical spray gun is connected to the discharge port of the spray patching tank. Specifically, the fully automatic mechanical spray gun may include a mounting seat and a nozzle, the spray angle of the nozzle is 360°, and the spray range of the nozzle in the vertical direction is 3~4.5m; the pressure of the spray patching tank is 0.5~1Mpa. In addition, since the spray patching operation is a high-temperature condition, corresponding cooling protection measures can also be taken for the spray patching assembly, for example, a water cooling mechanism is added to the periphery of the spray patching assembly, and a high-temperature resistant coating is applied, so as to prevent the spray patching assembly from being burned by high temperature.

[0035] During operation, the scanning component can scan the furnace lining as a whole and build a three-dimensional model. Then, by comparing it with the original model of the furnace lining, the corroded area of ​​the lining is found. Subsequently, the location of the weak area of ​​the lining and parameters such as the amount of lining erosion are calculated. Finally, the spray repair operation is completed by a fully automatic mechanical spray gun.

[0036] The spray patching device disclosed in the above embodiment has the characteristics of one-touch convenient operation, accurate spray patching position finding, and reduced consumption of spray patching materials, which can ensure that the "barrier layer" spray patching operation is convenient, accurate, and saves the use of barrier materials.

[0037] Example 1 like Figure 1 The preparation method of the electric furnace lining gunning material shown comprises: The dust removal ash and the titanium-containing powder are uniformly mixed in a mass ratio of 1:4 and heated to 1800°C to obtain an initial material; wherein the main components of the dust removal ash include: CaO, MgO, Al2O3, C, and in terms of mass percentage: C is 40%, Al2O3 is 15%, CaO is 15%, MgO is 8%, and the content of TiO2 in the titanium-containing powder is 70%; the initial material is kept at 1800°C for 1.5 hours, and then naturally cooled to room temperature to obtain a first material; the first material is crushed to a particle size of 50 mesh to 150 mesh, and made into a slurry to form a gunning material.

[0038] Example 2 like Figure 1The preparation method of the electric furnace lining gunning material shown comprises: The dust removal ash and the titanium-containing powder are evenly mixed in a mass ratio of 1:6 and heated to 1820°C to obtain an initial material; wherein the main components of the dust removal ash include: CaO, MgO, Al2O3, C, in terms of mass percentage: C is 50%, Al2O3 is 18%, CaO is 12%, MgO is 7%, and the content of TiO2 in the titanium-containing powder is 75%; the initial material is kept at 1820°C for 2 hours, and then naturally cooled to room temperature to obtain a first material; the first material is crushed to a particle size of 50 mesh to 150 mesh, and made into a slurry to form a gunning material.

[0039] Example 3 like Figure 1 The preparation method of the electric furnace lining gunning material shown comprises: The dust removal ash and the titanium-containing powder are evenly mixed in a mass ratio of 1:8 and heated to 1850°C to obtain an initial material; wherein the main components of the dust removal ash include: CaO, MgO, Al2O3, C, in terms of mass percentage: C is 60%, Al2O3 is 20%, CaO is 8%, MgO is 5%, and the content of TiO2 in the titanium-containing powder is 80%; the initial material is kept at 1850°C for 2.5 hours, and then naturally cooled to room temperature to obtain a first material; the first material is crushed to a particle size of 50 mesh to 150 mesh, and made into a slurry to form a gunning material.

[0040] Experiments have proved that the gunning material prepared by the above-mentioned method for preparing electric furnace lining gunning material has the characteristics of strong corrosion resistance and high viscosity. When the gunning material is sprayed on the inner wall of the furnace lining, a "barrier layer" can be formed between the titanium-containing molten blast furnace slag and the refractory bricks of the furnace lining, thereby reducing the corrosion of the refractory bricks of the furnace lining by the titanium-containing molten blast furnace slag and extending the service life of the AC furnace lining; in addition, the gunning device disclosed in the present application has the characteristics of one-button convenient operation, accurate gunning position finding, and reduced gunning material consumption, which can ensure that the "barrier layer" gunning operation is convenient, accurate, and saves the amount of barrier material.

[0041] So far, various embodiments of the present disclosure have been described in detail. In order to avoid obscuring the concept of the present disclosure, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed here.

[0042] Although some specific embodiments of the present disclosure have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. It should be understood by those skilled in the art that the above embodiments may be modified or some technical features may be replaced by equivalents without departing from the scope and spirit of the present disclosure. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict.

Claims

1. A method for preparing a gunning material for an electric furnace lining, characterized in that: include: Step 1: Evenly mix the dust removal ash and the titanium-containing powder and heat them to a first temperature to obtain an initial material; Step 2, keeping the initial material at the first temperature for 1.5 to 2.5 hours, and then naturally cooling to room temperature to obtain a first material; Step three: crushing the first material and making it into slurry to form gunning material.

2. The method for preparing the electric furnace lining gunning material according to claim 1, characterized in that: The dust removal ash includes: CaO, MgO, Al2O3 and C, and the mass percentage is: C 40-60%, Al2O3 15-20%, CaO 8-15%, MgO 5-8%.

3. The method for preparing the electric furnace lining gunning material according to claim 1, characterized in that: The titanium-containing powder includes TiO2, and the content of TiO2 is not less than 70% by mass.

4. The method for preparing the electric furnace lining gunning material according to claim 1, characterized in that: Calculated by mass ratio: titanium-containing powder: dust ash = 1:4~1:

8.

5. The method for preparing the electric furnace lining gunning material according to claim 1, characterized in that: The first temperature is 1800±50°C.

6. The method for preparing the electric furnace lining gunning material according to claim 1, characterized in that: The first material is crushed into a particle size of 50 mesh to 150 mesh.

7. A gunning device, characterized in that: include: Scanning assembly, spraying assembly and lifting assembly, among which, The lifting assembly includes a first lifting frame and a second lifting frame; The first lifting frame and the second lifting frame are located at the outlet end of the electric furnace; The scanning component is arranged on the first lifting frame; The spraying assembly is arranged on the second lifting frame.

8. The gunning device according to claim 7, characterized in that: The first lifting frame is also provided with a first cooling mechanism, which includes a partition wall and a shell. The partition wall divides the shell into a first cooling chamber and a second cooling chamber; The first cooling chamber is connected to a compressed air storage tank; The scanning assembly is located in the first cooling cavity; The second cooling cavity is wrapped around the outside of the first cooling cavity; The second cooling chamber is connected to a circulating water pipeline; The outer wall of the shell is coated with a high temperature resistant coating; The first cooling mechanism is further provided with a first through hole, and the first through hole penetrates from the first cooling cavity to the shell; The hole wall of the first through hole extends from the partition wall to the shell; The scanning component is arranged toward the first through hole.

9. The gunning device according to claim 7, characterized in that: The spray repair assembly comprises a fully automatic mechanical spray gun and a spray repair tank, and the feed inlet of the fully automatic mechanical spray gun is connected to the discharge outlet of the spray repair tank.

10. The gunning device according to claim 9, characterized in that: The fully automatic mechanical spray gun comprises a mounting seat and a nozzle, the spraying angle of the nozzle is 360°, and the spraying range of the nozzle in the vertical direction is 3-4.5 m; the pressure of the spray tank is 0.5-1 MPa.

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