Quick repair hot patching material for aluminum melting furnace and preparation process of quick repair hot patching material

Abstract

The invention relates to the field of hot patching materials and preparation processes, in particular to an aluminum melting furnace quick repair hot patching material and a preparation process thereof, and the hot patching material is prepared by mixing high bauxite aggregate, silicon carbide, high aluminum fine powder, an aluminum dihydrogen phosphate solution, kyanite powder and silica powder; wherein the hot patching material comprises the following components in percentage by weight; the high-alumina bauxite aggregate accounts for 43 to 57 parts, the silicon carbide accounts for 5 to 14 parts, the high-alumina fine powder accounts for 16 to 22 parts, the aluminum dihydrogen phosphate solution accounts for 6 to 10 parts, the kyanite powder accounts for 0.7 to 3.3 parts, and the silica powder accounts for 0.5 to 2.5 parts; according to the aluminum melting furnace quick repair hot patching material and the preparation process thereof, through the use of the overturning part, materials in the stirring barrel can be conveniently fed into the discharging plate through the discharging plate, so that the mixed materials can be conveniently discharged through the discharging plate; the silicon carbide and the kyanite powder are added into a stirring machine step by step for dry mixing, the aluminum dihydrogen phosphate solution obtained after dry mixing is evenly added into the stirring machine in three times, the production steps of the quick patching material are optimized through the steps, and the prepared hot patching material is better in performance.

Description

Technical Field

[0001] The invention belongs to the field of hot patching materials and preparation processes, and particularly relates to a hot patching material for quick repair of an aluminum melting furnace and a preparation process thereof. Background Art

[0002] Aluminum melting furnaces are common equipment used in industrial aluminum smelting. During the process of filling the furnace, the furnace is susceptible to friction and scratching. Chinese Patent No. CN101219904B discloses a repair material and a repair method. The repair material comprises 80-120 parts by weight of Material A, which contains refractory aggregate, refractory powder, and additives of pre-adjusted particle size; 15-35 parts by weight of Material B, which contains a binder and a diluent; and a hardener, a hardening accelerator, and a humectant added to either Material A or Material B, or one or more of these is added to Material A, with the remaining ingredients added to Material B. The repair material contains 0.1-2 parts by weight of hardener, 0.1-2 parts by weight of hardening accelerator, and 0.1-2 parts by weight of humectant. The repair method includes a secondary stirring process before the repair material is pressed into the delivery pipeline. The present invention has high continuity in the repair operation and good repair effect, and can achieve the goal of controlling the hardening reaction speed at any temperature and at any time from the time the repair material is pressed in to the time it hardens; However, the technical solution has the problem that the effect of the hot patch material is not ideal and there is a lack of special stirring equipment during the production process of the hot patch material, which increases the workload of the staff and is not conducive to the full mixing of the hot patch material, thereby reducing the performance of the hot patch material. Therefore, there is an urgent need for a quick repair hot patch material for an aluminum melting furnace and a preparation process thereof. Summary of the Invention

[0003] The purpose of the present invention is to overcome the defects in the background technology, such as the unsatisfactory effect of the hot patching material currently prepared and the lack of special stirring equipment during the production process of the hot patching material, which increases the workload of the staff and is not conducive to the sufficient mixing of the hot patching material, thereby reducing the performance of the hot patching material, thereby realizing a hot patching material for quick repair of aluminum melting furnaces and its preparation process.

[0004] To achieve the above-mentioned object, the technical solution of the present invention is: a quick-repair hot-patch material for an aluminum melting furnace and a preparation process thereof, comprising a hot-patch material formed by mixing high-alumina bauxite aggregate, silicon carbide, high-alumina fine powder, aluminum dihydrogen phosphate solution, kyanite powder, and silicon micropowder; wherein the weight fraction ratio of the hot-patch material is; The high-alumina bauxite aggregate is 43-57 parts, the silicon carbide is 5-14 parts, the high-alumina fine powder is 16-22 parts, the aluminum dihydrogen phosphate solution is 6-10 parts, the kyanite powder is 0.7-3.3 parts and the silicon micropowder is 0.5-2.5 parts.

[0005] Specifically, the high-alumina bauxite aggregate is dried in a dryer at a temperature of 108-111° C. for 17-25 hours, so that the moisture content of the high-alumina bauxite aggregate is ≤0.31%.

[0006] Specifically, the silicon carbide is 80-120 mesh and is acid-washed with 10% hydrogen fluoride for 30-38 minutes.

[0007] Specifically, 15-23 μm high-alumina fine powder is ball milled for 4-5 hours to a specific surface area of ​​≥0.35 m² / g; the kyanite powder is 200 mesh, pre-calcined at a temperature of 1350° C. and maintained for 2 hours.

[0008] Specifically, the concentration of the aluminum dihydrogen phosphate solution is 48±1%, and the aging time is 143-158 hours.

[0009] Specifically, the silicon powder is 0.2 μm.

[0010] A preparation process comprises the following steps: S1. Preprocessing The dried high-alumina bauxite aggregate is crushed into high-alumina bauxite particles with a diameter of 2.5-4.6 mm, and iron impurities are removed by magnetic separation; Dry the silicon carbide and kyanite powder at 197-210℃ for 4.1-4.4 hours to make the moisture content ≤0.31%; S2, dry mixing The dried high-alumina bauxite aggregate is added to a mixer at a speed of 30-35 rpm and mixed for 3-4 minutes. Then, the silicon carbide, silicon micropowder and kyanite powder in step S1 are added and mixed for 10 minutes, and the mixing uniformity CV is ≤5%. S3, wet mixing Add the aluminum dihydrogen phosphate solution into the above mixer in three equal portions, with a total mixing time of 20±2 min, so that the slurry expansion is ≥160 mm; S4, trapped material The slurry in step S3 is stored in a stainless steel silo, which is maintained at a temperature of 23-25° C., a humidity less than 39.5%, and is protected by nitrogen.

[0011] Specifically, the mixer includes a support frame, a discharge plate with an upper opening is installed on the support frame, a hollow mixing drum is provided on the upper side of the discharge plate, the lower side of the interior of the mixing drum is connected to a rotating shaft through a bearing seat, and multiple groups of stirring components are installed on the rotating shaft for rapid mixing of materials in the mixing drum, one end of the rotating shaft is connected to a power motor, the power motor is fixed to the support frame, a discharge plate is provided in contact with the lower side of the middle of the mixing drum, a flip component is fixedly provided on the lower side of the discharge plate, and the flip component is connected to the rotating shaft through a pulley and a belt.

[0012] The transmission gear is engaged with the gear train of said sliding panel and the transmission gear is engaged with the gear of said sliding panel and the transmission gear is engaged with the gear of said sliding panel and the transmission gear is engaged with the gear of said sliding panel and the transmission gear is engaged with the gear of said sliding panel and the transmission gear is engaged with the gear of said sliding panel and the transmission gear is

[0013] Specifically, the stirring component includes a sleeve plate that is slidably arranged with the rotating shaft, a locking pin is threadedly connected to one side of the sleeve plate, and multiple groups of evenly distributed sockets are opened in the length direction of the sleeve plate. The side of the locking pin away from the thread is located in the socket and can be pulled out in the socket, and the sleeve plates are fixed with an arc-shaped stirring wheel.

[0014] Compared with the prior art, the aluminum melting furnace quick repair hot patch material and its preparation process of the present invention have at least the following beneficial effects: The present invention facilitates the rapid mixing of materials in the mixing drum by installing multiple groups of stirring components on the rotating shaft. The use of the flipping component facilitates the feeding of the materials in the mixing drum into the discharge plate through the discharge plate, thereby facilitating the discharge of the mixed materials through the discharge plate. The pretreated high-alumina bauxite particles, silicon carbide, and kyanite powder are added to the mixer step by step for dry mixing, and the dry-mixed aluminum dihydrogen phosphate solution is added to the above-mentioned mixer in three equal amounts. The above steps optimize the production steps of the fast-filling material, and the configured hot-filling material has better performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a process flow chart for preparing the hot patch material of the present invention; Figure 2 It is a first overall structural diagram of the mixer of the present invention; Figure 3 It is a second overall structural schematic diagram of the mixer of the present invention; Figure 4 It is a schematic diagram of the structure of the mixing drum of the present invention; Figure 5 It is a schematic structural diagram of the stirring component of the present invention; Figure 6 Schematic diagram of the active rack structure of the present invention; Figure 7 It is a schematic structural diagram of the discharge plate of the present invention.

[0016] In the figure: 1-cover plate; 2-mixing drum; 3-support frame; 4-filling pipe; 5-power motor; 6-auxiliary ribs; 7-discharge plate; 8-rotating shaft; 9-mixing wheel; 10-vertical rod; 12-locking pin; 13-flip rod; 14-discharge plate; 15-reinforcement rib; 16-socket; 17-connecting shaft; 18-transmission gear; 19-transmission rack; 20-driving gear; 21-driving rack; 22-limiting plate; 23-fixing rod; 24-positioning plate; 25-guide trough; 26-insert plate. DETAILED DESCRIPTION

[0017] The aluminum melting furnace quick repair hot patching material and its preparation process of the present invention are described in more detail below with reference to the accompanying drawings and through specific implementation methods.

[0018] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0019] This embodiment discloses a quick repair hot patch material for aluminum melting furnace and its preparation process, such as Figure 1-7 As shown, the hot patching material comprises a mixture of high-alumina bauxite aggregate, silicon carbide, high-alumina fine powder, aluminum dihydrogen phosphate solution, kyanite powder and silicon powder; wherein the weight fraction ratio of the above hot patching materials is; The high-alumina bauxite aggregate is 43-57 parts, the silicon carbide is 5-14 parts, the high-alumina fine powder is 16-22 parts, the aluminum dihydrogen phosphate solution is 6-10 parts, the kyanite powder is 0.7-3.3 parts and the silicon micropowder is 0.5-2.5 parts.

[0020] The high-alumina bauxite aggregate is dried using a chain dryer at a temperature of 108-111° C. for 17-25 hours, so that the moisture content of the high-alumina bauxite aggregate is ≤0.31%.

[0021] The silicon carbide is 80-120 mesh and is acid-washed with 10% hydrogen fluoride for 30-38 minutes.

[0022] The 15-23 μm high-alumina fine powder is ball-milled for 4-5 hours to a specific surface area of ​​≥0.35 m² / g; the kyanite powder is 200 mesh and pre-calcined at a temperature of 1350°C for 2 hours.

[0023] The concentration of the aluminum dihydrogen phosphate solution is 48±1%, and the aging time is 143-158 hours.

[0024] The silicon powder is 0.2 μm.

[0025] A preparation process comprises the following steps: S1. Preprocessing The dried high-alumina bauxite aggregate is crushed into high-alumina bauxite particles with a diameter of 2.5-4.6 mm, and iron impurities are removed by magnetic separation; Dry the silicon carbide and kyanite powder at 197-210℃ for 4.1-4.4 hours to make the moisture content ≤0.31%; S2, dry mixing The dried high-alumina bauxite aggregate is added to a mixer at a speed of 30-35 rpm and mixed for 3-4 minutes. Then, the silicon carbide, silicon micropowder and kyanite powder in step S1 are added and mixed for 10 minutes, and the mixing uniformity CV is ≤5%. S3, wet mixing Add the aluminum dihydrogen phosphate solution into the above mixer in three equal portions, with a total mixing time of 20±2 min, so that the slurry expansion is ≥160 mm; S4, trapped material The slurry in step S3 is stored in a stainless steel silo, which is maintained at a temperature of 23-25° C., a humidity less than 39.5%, and is protected by nitrogen.

[0026] The mixer includes a support frame 3, a discharge plate 7 with an upper opening is installed on the support frame 3, a hollow mixing drum 2 is arranged on the upper side of the discharge plate 7, and a rotating shaft 8 is connected to the lower side of the mixing drum 2 through a bearing seat. A plurality of stirring components are installed on the rotating shaft 8 for rapid mixing of materials in the mixing drum 2, one end of the rotating shaft 8 is connected to a power motor 5, the power motor 5 is fixed to the support frame 3, a discharge plate 14 is provided in contact with the lower side of the middle of the mixing drum 2, a flip component is fixedly provided on the lower side of the discharge plate 14, and the flip component is connected to the rotating shaft 8 through a pulley and a belt. By putting the processed high-alumina bauxite aggregate into the mixing drum 2, and then turning on the power motor 5 in the forward direction, the power motor 5 drives The rotating shaft 8 rotates, and the rotating shaft 8 drives the stirring component to rotate, thereby facilitating the stirring and mixing of the materials in the mixing drum 2. By turning on the power motor 5 in the reverse direction, the rotating shaft 8 is reversed, and the rotation drives the flipping component to work, thereby facilitating the material in the mixing drum 2 to be fed into the discharge plate 7 through the discharge plate 14, thereby facilitating the discharge of the mixed material through the discharge plate 7. A cover plate 1 is hinged on the mixing drum 2 for closing the opening position on the upper side of the mixing drum 2. A filling pipe 4 is fixedly connected to the cover plate 1, which facilitates the addition of materials into the mixing drum 2 through the filling pipe 4. An auxiliary rib 6 is fixedly provided on the support frame 3. The auxiliary rib 6 is fixedly provided with the mixing drum 2, and the auxiliary rib 6 has a supporting function.

[0027] The flipping component includes a flipping rod 13 fixedly provided with a blanking plate 14, a transmission gear 18 fixedly provided on one side of the flipping rod 13, and the transmission gear 18 is meshedly connected with a transmission rack 19. A positioning plate 24 with a slide groove is fixedly provided on the support frame 3, and a slide plate that cooperates with the slide groove is inserted in the middle side of the positioning plate 24. One side of the slide plate is fixedly provided with the transmission rack 19, and the other side of the slide plate is fixedly provided with an active rack 21. The active rack 21 is meshedly connected with a driving gear 20, and the driving gear 20 is fixed to the flipping rod 13. The active rack 21 is symmetrically fixed with two sets of fixed plates in the upper and lower directions. The fixed plates are fixed with fixed rods 23. Any set of fixed rods 23 is connected with a limiting plate 22. Two springs are fixed between the limiting plate 22 and the corresponding fixed plate. The springs are sleeved on the outside of the fixing rods 23. The active gear 20 is fixedly connected with a connecting shaft 17. The connecting shaft 17 is rotatably arranged with the support frame 3. The connecting shaft 17 is connected to the rotating shaft 8 through a pulley and a belt. By rotating the rotating shaft 8 in the opposite direction, the rotating shaft 8 drives the active gear 20 to rotate. The driving gear 20 drives the driving rack 21 to move downward. Due to the use of the lower spring, the driving gear 20 is disengaged from the driving rack 21. At the same time, the spring gives the limiting plate 22 an upward force, so that the driving gear 20 is always engaged with the limiting plate 22. At this time, the driving rack 21 opens the blanking plate 14 during the downward movement. When the driving gear 20 is engaged with the limiting plate 22, the blanking plate 14 reaches a maximum opening angle. At the same time, the rotating shaft 8 rotates in the opposite direction to drive the material in the mixing drum 2 to come down from the blanking plate 14. It can also reduce the accumulation of material in the mixing drum 2 and make it difficult to fall into the position of the blanking plate 14; similarly, the power motor 5 is turned on in the forward direction, and the power motor 5 drives the rotating shaft 8 to rotate forward, so that the blanking plate 14 closes the opening position of the lower side of the mixing drum 2. The rotating shaft 8 drives multiple stirring components to rotate. Through the coordinated use of several stirring components, it is convenient to efficiently stir the material in the mixing drum 2; a plurality of reinforcing ribs 15 are fixedly connected to the flip rod 13, and the reinforcing ribs 15 are fixedly arranged with the blanking plate 14.

[0028] The stirring component includes a sleeve 11 slidingly arranged on the rotating shaft 8, and a locking pin 12 is threadedly connected to one side of the sleeve 11. A plurality of groups of evenly distributed sockets 16 are opened in the length direction of the sleeve 11. The side of the locking pin 12 away from the thread is located in the socket 16 and can be pulled out in the socket 16. The sleeve 11 is fixed with an arc-shaped stirring wheel 9, and a vertical rod 10 is fixedly arranged on the lower side of the stirring wheel 9. The lower side of the vertical rod 10 is fixed to the sleeve 11, which is convenient for fixing the position of the stirring wheel 9 on the sleeve 11.

[0029] The sleeve plate 11 is fixed to the length direction of the rotating shaft 8 by the threaded connection between the locking pin 12 and the sleeve plate 11 and the pulling of the locking pin 12 and the insertion hole 16; a material guide groove 25 is provided at the lower side of the discharge plate 7, and an insert plate 26 is inserted in the middle of the material guide groove 25. The insert plate 26 and the discharge plate 7 are slidingly arranged to facilitate the upward movement of the position of the insert plate 26, so that the material after mixing is discharged through the material guide groove 25.

[0030] The present invention comprises the following steps: crushing dried high-alumina bauxite aggregate into high-alumina bauxite particles with a diameter of 2.5-4.6 mm, and removing iron impurities by magnetic separation; adding the dried high-alumina bauxite aggregate into a mixer with a rotation speed of 30-35 rpm, mixing for 3-4 minutes, adding the silicon carbide, silicon micropowder and kyanite powder in the above step S1 and mixing, and then adding the aluminum dihydrogen phosphate solution into the mixer in equal amounts three times for a total mixing time of 20±2 minutes, so that the slurry expansion is ≥160 mm, and finally storing the slurry in step S3 in a stainless steel silo and protecting it with nitrogen.

[0031] It should be noted that the structures depicted in the drawings herein are not fixed, unchangeable implementations of the present invention in practice. The components of the embodiments of the present invention generally described and illustrated in the drawings herein may be arranged and designed in a variety of different configurations. Furthermore, the drawings in this specification and the abstract are schematic only and do not represent the specific structure or actual quantities of the components in practice.

[0032] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by persons of ordinary skill in the field to which the invention belongs. The use of "one" or "an" and other similar words in the specification and claims of this application does not necessarily indicate a quantitative limitation. "Include" or "comprising" and other similar words mean that the elements or parts preceding the word include the elements or parts listed after the word and their equivalents, without excluding other elements or parts. "Connect" or "connected" and other similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0033] The exemplary embodiments of the present invention are described in detail above with reference to preferred embodiments. However, it will be understood by those skilled in the art that, without departing from the concept of the present invention, various variations and modifications may be made to the above-mentioned specific embodiments, and various combinations of the various technical features and structures proposed in the present invention may be made without exceeding the scope of protection of the present invention.

Claims

1. A quick repair hot patching material for an aluminum melting furnace, characterized by: A hot-repairing material comprising a mixture of high-alumina bauxite aggregate, silicon carbide, high-alumina fine powder, aluminum dihydrogen phosphate solution, kyanite powder and silicon powder; wherein the weight fraction ratio of the hot-repairing material is: The high-alumina bauxite aggregate is 43-57 parts, the silicon carbide is 5-14 parts, the high-alumina fine powder is 16-22 parts, the aluminum dihydrogen phosphate solution is 6-10 parts, the kyanite powder is 0.7-3.3 parts and the silicon micropowder is 0.5-2.5 parts.

2. The aluminum melting furnace quick repair hot patching material according to claim 1, characterized in that: The high-alumina bauxite aggregate is dried in a dryer at a temperature of 108-111° C. for 17-25 hours, so that the moisture content of the high-alumina bauxite aggregate is ≤0.31%.

3. The aluminum melting furnace quick repair hot patching material according to claim 2, characterized in that: The silicon carbide is 80-120 mesh and is acid-washed with 10% hydrogen fluoride for 30-38 minutes.

4. The aluminum melting furnace quick repair hot patching material according to claim 1, characterized in that: The 15-23 μm high-alumina fine powder is ball-milled for 4-5 hours to a specific surface area of ​​≥0.35 m² / g; the kyanite powder is 200 mesh and pre-calcined at a temperature of 1350° C. for 2 hours.

5. The aluminum melting furnace quick repair hot patching material according to claim 2, characterized in that: The concentration of the aluminum dihydrogen phosphate solution is 48±1%, and the aging time is 143-158 hours.

6. The aluminum melting furnace quick repair hot patching material according to claim 5, characterized in that: The silicon powder is 0.2 μm.

7. A preparation process, applied to the aluminum melting furnace quick repair hot patching material according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1. Preprocessing The dried high-alumina bauxite aggregate is crushed into high-alumina bauxite particles with a diameter of 2.5-4.6 mm, and iron impurities are removed by magnetic separation; Dry the silicon carbide and kyanite powder at 197-210℃ for 4.1-4.4 hours to make the moisture content ≤0.31%; S2, dry mixing The dried high-alumina bauxite aggregate is added to a mixer at a speed of 30-35 rpm and mixed for 3-4 minutes. Then, the silicon carbide, silicon micropowder and kyanite powder in step S1 are added and mixed for 10 minutes, and the mixing uniformity CV is ≤5%. S3, wet mixing Add the aluminum dihydrogen phosphate solution into the above mixer in three equal portions, with a total mixing time of 20±2 min, so that the slurry expansion is ≥160 mm; S4, trapped material The slurry in step S3 is stored in a stainless steel silo, which is maintained at a temperature of 23-25° C., a humidity less than 39.5%, and is protected by nitrogen.

8. A preparation process according to claim 7, characterized in that: The mixer comprises a support frame (3), a discharge plate (7) with an upper opening is mounted on the support frame (3), a hollow mixing drum (2) is arranged on the upper side of the discharge plate (7), a rotating shaft (8) is connected to the lower side of the interior of the mixing drum (2) via a bearing seat, a plurality of stirring components are mounted on the rotating shaft (8) for quickly mixing the materials in the mixing drum (2), one end of the rotating shaft (8) is connected to a power motor (5), the power motor (5) is fixedly arranged on the support frame (3), a discharge plate (14) is contacted with the lower side of the middle of the mixing drum (2), a flip component is fixedly arranged on the lower side of the discharge plate (14), and the flip component is connected to the rotating shaft (8) via a pulley and a belt.

9. A preparation process according to claim 8, characterized in that: The flipping component includes a flipping rod (13) fixedly arranged with the blanking plate (14), a transmission gear (18) fixedly arranged on one side of the flipping rod (13), the transmission gear (18) meshingly connected with the transmission rack (19), a positioning plate (24) with a slide groove fixedly arranged on the support frame (3), a slide plate matched with the slide groove inserted in the middle side of the positioning plate (24), one side of the slide plate is fixedly arranged with the transmission rack (19), and the other side of the slide plate is fixedly arranged with an active rack (21), the active rack (21) meshingly connected with the active gear (20), the active gear (20) 0) is fixedly arranged with the flip rod (13), the active rack (21) is symmetrically fixed with two sets of fixed plates in the upper and lower directions, and the fixed plates are fixedly provided with fixed rods (23), and any set of fixed rods (23) is plugged with a limiting plate (22), and two springs are fixedly arranged between the limiting plate (22) and the corresponding fixed plate, and the springs are sleeved on the outside of the fixed rods (23), the active gear (20) is fixedly connected with a connecting shaft (17), and the connecting shaft (17) and the support frame (3) are rotatably arranged, and the connecting shaft (17) is connected to the rotating shaft (8) through a pulley and a belt.

10. A preparation process according to claim 7, characterized in that: The stirring component comprises a sleeve (11) slidably arranged with the rotating shaft (8), a locking pin (12) being threadedly connected to one side of the sleeve (11), a plurality of evenly distributed insertion holes (16) being provided in the length direction of the sleeve (11), a side of the locking pin (12) away from the thread being located in the insertion hole (16) and capable of being pulled out of the insertion hole (16), and an arc-shaped stirring wheel (9) being fixedly arranged on each sleeve (11).

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