Method and equipment for preparing magnesia carbon brick by reusing refractory material

Abstract

The invention provides a method and equipment for preparing a magnesia carbon brick by using a refractory material, belongs to the technical field of magnesia carbon bricks, and solves the technical problems of low preparation quality and the like in the prior art. Performing peeling operation by using frosted sand to obtain a regenerated material; the peeled regenerated materials are fed into a crushing box through a material conveying mechanism to be crushed, and regenerated particles are obtained; the regenerated particles are fed into a mixing box, heating and drying are conducted firstly, the heating temperature is 70-90 DEG C, and the drying time is 30-50 min; the preparation method comprises the following steps: adding modified phenolic resin into a mixing box, mixing for 5-10 minutes, adding high-purity magnesia, tar, aluminum oxide, bentonite and asphalt, and mixing at 90-110 DEG C for 2535 minutes. The refractory material crushing device has the advantages that the refractory material is peeled before crushing, and the processing quality is further improved.

Description

Technical Field

[0001] This invention belongs to the field of magnesia-carbon brick technology, and relates to a method for preparing magnesia-carbon bricks, particularly a method and equipment for preparing magnesia-carbon bricks by reusing refractory materials. Background Technology

[0003] Currently, the primary method for disposing of waste refractory materials is landfilling. This not only occupies land but also, due to weathering and rain exposure, easily damages the soil. With my country's advancement of its circular economy and sustainable development strategy, the research and reuse of used waste refractory materials needs to be gradually increased to prevent resource waste.

[0004] A search revealed a method for producing magnesia-carbon bricks from recycled waste refractory materials in Chinese patent literature [Application No.: 202211588106.9; Publication No.: CN 115959889 A]. The process involves classifying and screening the waste refractory materials, mixing them according to a prescribed ratio based on the total mass of the recycled material, crushing them, removing iron with copper sulfate, heating and drying, heating and mixing, high-pressure firing, and then allowing them to cool and regenerate into magnesia-carbon bricks. This invention utilizes waste refractory materials to produce recycled magnesia-carbon bricks. The process is simple, reduces waste of waste refractory materials, and promotes the recycling and increased added value of waste materials. The recycled magnesia-carbon bricks produced using waste refractory materials as raw materials have good thermal shock resistance and pressure resistance, resulting in considerable economic benefits.

[0005] Although the preparation process disclosed in this patent produces recycled magnesia-carbon bricks with good thermal shock resistance and pressure resistance, resulting in considerable economic benefits, the process does not perform a peeling operation before crushing the refractory material. The surface of the waste refractory material contains a large amount of impurities, which affects the quality of subsequent processing. Summary of the Invention

[0006] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a method and equipment for preparing magnesia-carbon bricks using recycled refractory materials. The technical problem this invention aims to solve is: how to remove the outer layer of the refractory material before crushing, thereby further improving the quality of the processing.

[0007] The objective of this invention can be achieved through the following technical solutions: A method for preparing magnesia-carbon bricks using recycled refractory materials includes the following steps: S1. Placing the recycled refractory material into a grinding box and using abrasive grinding to remove the outer layer, obtaining recycled material; S2. Feeding the removed recycled material into a crushing box via a conveying mechanism for crushing, obtaining recycled granular material; S3. Feeding the recycled granules into a mixing box, first heating and drying at a temperature of 70-90℃ for 30-50 minutes; S4. First adding modified phenolic resin to the mixing box and mixing for 5-10 minutes, then adding high-purity magnesia, tar, alumina, bentonite, and asphalt, and mixing at 90-110℃ for 25-35 minutes; S5. High-pressure molding of the resulting mixture, firing in a high-temperature tunnel kiln at 1100-1400℃ for 79 hours, and cooling to obtain recycled magnesia-carbon bricks.

[0008] The heating and drying conditions in step S3 are a heating rate of 5-10℃ / min.

[0009] The pressure range for high-pressure molding in step S5 is 150-350 MPa.

[0010] The weight ratio in step S4 is as follows: 30-40 parts recycled granules, 25-45 parts high-purity magnesia, 15-20 parts phenolic resin, 3-5 parts tar, 8-10 parts alumina, 5-10 parts bentonite, and 4-6 parts asphalt.

[0011] A device for preparing magnesia-carbon bricks using recycled refractory materials includes a grinding box, a crushing box, a mixing box, and a waste bin. The grinding box contains a stirring mechanism and a discharge port at its lower end, equipped with a discharge mechanism. A conveying mechanism connects the grinding box and the crushing box. A screw feeder connects the crushing box and the mixing box. A feeding hopper and a mixing motor are fixed to the upper end of the mixing box. A rotating cylinder is fixed to the output shaft of the mixing motor. A rotating column is slidably connected to the inside of the rotating cylinder via a slide rail. A grinding seat is fixed to the lower end of the rotating column. A screening plate that mates with the grinding seat is fixed inside the mixing box. The screening holes on the screening plate are arranged in multiple rows in a ring. A sealing mechanism that mates with the screening plate is located inside the mixing box. The system includes a material chamber formed between the lower side of the screening plate and the mixing box, a communication port between the debris box and the material chamber, a rotary motor fixed inside the mixing box, a circular plate fixed at the output shaft end of the rotary motor located in the communication port, several magnetic plates and non-magnetic plates fixed on the outer periphery of the circular plate, the magnetic plates and non-magnetic plates being arranged alternately, a scraper hood fixed inside the debris box, the inner side of the scraper hood contacting the upper and lower surfaces of the magnetic plates and non-magnetic plates, several leakage holes opened on the non-magnetic plates, several heating rods fixed inside the grinding seat, several screw conveyors fixed inside the grinding seat, the lower end of the screw conveyor blades extending out of the lower end of the grinding seat, the discharge port of the screw conveyor located in the upper inner part of the mixing box, and a discharge pipe fixed at the lower end of the mixing box.

[0012] Using the above structure, the recycled refractory material is placed in the grinding box and peeled using abrasive grinding to obtain recycled material. The peeled recycled material is then fed into the crushing box via a conveying mechanism to obtain recycled granules. These granules are then fed into the mixing box, where they are first heated and dried using a heating rod at 70-90℃ for 30-50 minutes. Simultaneously, the mixing motor is activated, driving the grinding head and grinding seat to rotate. The grinding seat and screw conveyor mechanism agitate the material, ensuring efficient drying. Next, modified phenolic resin is added to the mixing box and mixed for 5-10 minutes. Then, high-purity magnesia, tar, alumina, bentonite, and asphalt are added, and the mixture is mixed at 90-110℃ for 2 minutes. The grinding process takes 535 minutes. The grinding base and screening plate work together to grind the material. During rotary grinding, the screw conveyor is intermittently activated to transport the material between the grinding base and screening plate to the top, allowing other mixed materials to be ground and ensuring uniform grinding. After grinding, the sealing mechanism is activated, allowing the mixed material to fall from the screening holes into the material chamber. Simultaneously, the rotary motor is activated, driving the magnetic plate and non-magnetic plate to rotate. The magnetic plate collects iron filings and other impurities from the mixed material, which then rotates into the waste bin. A scraper cover scrapes the iron filings off the magnetic plate, causing them to fall into the waste bin, thus completing the impurity removal process and ensuring the purity of the mixed material. This structure offers good impurity removal effect and high efficiency.

[0013] The sealing assembly includes a sealing frame with a slip ring fixed to its outer periphery. An annular groove is provided inside the mixing chamber, and the slip ring is rotatably connected to the annular groove. A drive motor is fixed to the bottom of the mixing chamber, and a drive shaft is fixed to the output shaft end of the drive motor. The drive shaft is fixedly connected to the sealing frame. The sealing frame is composed of several annularly distributed sealing plates.

[0014] With the above structure, when grinding and mixing materials, the blocking plate blocks the screening holes on the screening plate. After grinding and mixing are completed, the drive motor drives the drive shaft to rotate, which in turn drives the blocking frame to rotate, causing the blocking plate to deviate from the screening holes, so that the mixed material can fall. The structure is simple, highly automated, and reduces the difficulty of the work.

[0015] The stirring mechanism includes a grinding motor, a grinding shaft is fixed to the output shaft end of the grinding motor, and several stirring plates are fixed to the outer periphery of the grinding shaft.

[0016] With the above structure, when peeling refractory materials, the grinding motor drives the grinding shaft and the agitator to rotate, so that the internal abrasives peel the refractory materials, thereby removing the impurities on the outside of the refractory materials and improving the quality of subsequent processing.

[0017] The discharge mechanism includes a filter screen. A sliding cavity is provided inside the grinding box. A first electric telescopic rod is fixed inside the sliding cavity. A filter screen is fixed to the telescopic end of the first electric telescopic rod. The filter screen is located inside the discharge port. A discharge motor is fixed to the lower end of the grinding box. A connecting frame is fixed to the output shaft end of the discharge motor. A sealing plate is fixed on the connecting frame. The sealing plate abuts against the lower end of the discharge port.

[0018] With the above structure, after peeling, the discharge motor first drives the sealing plate to detach from the discharge port, and the abrasive is discharged through the discharge port. The filter screen blocks the refractory material. After the abrasive is discharged, the first electric telescopic rod drives the filter screen to open, and the refractory material is fed into the conveying mechanism. The operation is simple and convenient, and it is easy to separate the refractory material from the abrasive.

[0019] The material conveying assembly includes a mounting frame and a slide rail. The slide rail is located at the lower end of the grinding box. A movable seat is slidably connected to the slide rail. An electric wheel is installed on the movable seat. A support column is fixed to the upper end of the movable seat. A connecting seat is inserted into the upper end of the support column. A conveying box is fixed to the connecting seat. Square seats are fixed to the left and right ends of the conveying box. A square opening is opened on the directional seat. The mounting frame is fixed to the grinding box and the crushing box. A moving motor is fixed to the mounting frame. A threaded rod is fixed to the output shaft end of the moving motor. A translation seat is threadedly connected to the threaded rod. Two second electric telescopic rods are fixed to the lower side of the translation seat. A tilting motor is fixed to the telescopic end of the second electric telescopic rod. A third electric telescopic rod is fixed to the output shaft end of the tilting motor. A tilting block is fixed to the telescopic end of the third electric telescopic rod.

[0020] Using the above structure, the conveyor box is initially placed below the discharge port to receive the refractory material. After receiving, the electric wheel moves to the right, and then the second electric telescopic rod drives the tilting block to descend. After aligning the tilting block with the square opening, the third electric rod sends the tilting block into the directional opening. Then, using the cooperation of the second electric telescopic rod and the moving motor, the conveyor box is moved to the top of the feed hopper of the crushing box. The tilting motor drives the conveyor box to tilt, realizing the feeding. Then the conveyor box is placed back on the moving base. The automation level is high, saving time and labor.

[0021] Compared with existing technologies, the method and equipment for preparing magnesia-carbon bricks by reusing refractory materials have the following advantages: 1. The preparation process of this invention can utilize waste refractory materials, which is energy-saving and environmentally friendly, reduces production costs, and improves the quality of magnesia-carbon bricks through the peeling process.

[0022] 2. The grinding base and screening plate work together to grind the material. During the rotary grinding process, the screw conveyor is intermittently activated to transport the material between the grinding base and the screening plate to the top of the material, allowing other mixed materials to be ground and ensuring uniform grinding. After grinding, the sealing mechanism is activated, allowing the mixed material to fall from the screening holes into the material chamber. At the same time, the rotary motor is activated, driving the magnetic plate and non-magnetic plate to rotate. The magnetic plate collects iron filings and other impurities in the mixed material, which then rotates into the waste bin. A scraper cover scrapes the iron filings off the magnetic plate, causing them to fall into the waste bin, thus completing the impurity removal operation of the mixed material and ensuring its purity. This structure has a good impurity removal effect and high efficiency.

[0023] 3. When grinding and mixing materials, the blocking plate blocks the screening holes on the screening plate. After grinding and mixing, the drive motor drives the drive shaft to rotate, which in turn drives the blocking frame to rotate, causing the blocking plate to deviate from the screening holes, allowing the mixed material to fall. The structure is simple, highly automated, and reduces the difficulty of the work.

[0024] 4. After peeling, the discharge motor first drives the sealing plate to detach from the discharge port, and the abrasive is discharged through the discharge port. The filter screen blocks the refractory material. After the abrasive is discharged, the first electric telescopic rod drives the filter screen to open, and the refractory material is fed into the conveying mechanism. The operation is simple and convenient, and it is easy to separate the refractory material from the abrasive.

[0025] 5. Initially, the conveyor box is placed below the discharge port to receive the refractory material. After receiving, the electric wheel moves to the right, and then the second electric telescopic rod drives the tilting block to descend. After aligning the tilting block with the square opening, the third electric rod sends the tilting block into the directional opening. Then, using the cooperation of the second electric telescopic rod and the moving motor, the conveyor box is moved to the top of the feed hopper of the crushing box. The tilting motor drives the conveyor box to tilt, realizing the feeding. Then, the conveyor box is placed back on the moving seat. The degree of automation is high, saving time and labor. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the process flow of the present invention.

[0027] Figure 2 This is a schematic diagram of the equipment used to prepare magnesium-carbon bricks according to the present invention.

[0028] Figure 3 This is a schematic diagram of the grinding box in this invention.

[0029] Figure 4 This is a schematic diagram of the mixing box in this invention.

[0030] Figure 5This is a schematic diagram of the flipping part in this invention.

[0031] Figure 6 This is a schematic diagram of the sealing mechanism in this invention.

[0032] Figure 7 This is a schematic diagram of the magnetic plate in this invention.

[0033] Figure 8 This is the test form of the present invention.

[0034] In the diagram: 1. Grinding box; 2. Slide rail; 3. Moving seat; 4. Support column; 5. Connecting seat; 6. Conveying box; 7. Square seat; 8. Mounting frame; 9. Moving motor; 10. Threaded rod; 11. Translation seat; 12. Second electric telescopic rod; 13. Tilting motor; 14. Crushing box; 15. Screw feeder; 16. Mixing box; 17. Third electric telescopic rod; 18. Tilting block; 19. Grinding motor; 20. Grinding shaft; 21. Disruptor plate; 22. Filter screen; 23. First electric telescopic rod. 24. Shrink rod; 25. Discharge motor; 26. Connecting frame; 27. Sealing plate; 28. Feeding hopper; 29. ​​Mixing motor; 30. Rotating drum; 31. Rotating column; 32. Grinding seat; 33. Screw conveyor; 34. Screening plate; 35. Sealing frame; 36. Heating rod; 37. Miscellaneous box; 38. Scraper cover; 39. Circular plate; 40. Rotary motor; 41. Drive motor; 42. Drive shaft; 43. Sealing plate; 44. Slip ring; 45. Non-magnetic plate; 46. Magnetic plate; 47. Leakage hole. Detailed Implementation

[0035] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0036] like Figure 1 As shown, this embodiment provides a method for preparing magnesia-carbon bricks using recycled refractory materials, including the following steps: S1, placing the recycled refractory material into a grinding box and using abrasive to remove the outer layer, obtaining recycled material; S2, feeding the removed recycled material into a crushing box via a conveying mechanism for crushing, obtaining recycled granular material; S3, feeding the recycled granules into a mixing box, first heating and drying at a temperature of 70-90℃ for 30-50 minutes; S4, first adding modified phenolic resin to the mixing box and mixing for 5-10 minutes, then adding high-purity magnesia, tar, alumina, bentonite, and asphalt, mixing at 90-110℃ for 25-35 minutes; S5, the resulting mixture is subjected to high-pressure molding and fired in a high-temperature tunnel kiln at 1100-1400℃ for 79 hours, and after cooling, recycled magnesia-carbon bricks are obtained.

[0037] The heating and drying conditions in step S3 are a heating rate of 5-10℃ / min.

[0038] The pressure range for high-pressure molding in step S5 is 150-350 MPa.

[0039] The weight ratio in step S4 is as follows: 30-40 parts recycled granules, 25-45 parts high-purity magnesia, 15-20 parts phenolic resin, 3-5 parts tar, 8-10 parts alumina, 5-10 parts bentonite, and 4-6 parts asphalt.

[0040] like Figure 2-7 As shown, an apparatus for preparing magnesia-carbon bricks using recycled refractory materials includes a grinding box 1, a crushing box 14, a mixing box 16, and a waste bin 36. The grinding box 1 is equipped with a stirring mechanism. A discharge port is located at the lower end of the grinding box 1, and a discharge mechanism is installed on the discharge port. A conveying mechanism is installed between the grinding box 1 and the crushing box 14. A screw feeder 15 is installed between the crushing box 14 and the mixing box 16. A feeding hopper 27 is fixed to the upper end of the mixing box 16, and a mixing motor 28 is fixed to the upper end of the mixing box 16. A rotating cylinder 29 is fixed to the output shaft end of the mixing motor 28. A rotating column 30 is slidably connected inside the rotating cylinder 29 via a slide rail 2. A grinding seat 31 is fixed to the lower end of the rotating column 30. A screening plate 33, which cooperates with the grinding seat 31, is fixed inside the mixing box 16. The screening holes on the screening plate 33 are arranged in multiple rows in a ring. A sealing machine, which cooperates with the screening plate 33, is installed inside the mixing box 16. The structure includes a material cavity formed between the lower side of the screening plate 33 and the mixing box 16, a communication port between the waste box 36 and the material cavity, a rotary motor 39 fixed inside the mixing box 16, a circular plate 38 fixed at the output shaft end of the rotary motor 39 located in the communication port, a number of magnetic plates 45 and non-magnetic plates 44 fixed on the outer periphery of the circular plate 38, the magnetic plates 45 and non-magnetic plates 44 being arranged alternately, a scraper cover 37 fixed inside the waste box 36, the inner side of the scraper cover 37 contacting the upper and lower surfaces of the magnetic plates 45 and the non-magnetic plates 44, a number of leakage holes 46 opened on the non-magnetic plates 44, a number of heating rods 35 fixed inside the grinding seat 31, a number of screw conveyors 32 fixed inside the grinding seat 31, the lower end of the screw conveyor blades of the screw conveyor 32 extending out of the lower end of the grinding seat 31, the discharge port of the screw conveyor 32 located in the upper inner part of the mixing box 16, and a discharge pipe fixed at the lower end of the mixing box 16.

[0041] The recycled refractory material is placed into the grinding box 1 and descaled using abrasive grinding to obtain recycled material. The descaled recycled material is then fed into the crushing box 14 via a conveying mechanism to obtain recycled granules. These granules are then fed into the mixing box 16, where they are first heated and dried using a heating rod 35 at a temperature of 70-90℃ for 30-50 minutes. Simultaneously, the mixing motor 28 is activated, driving the grinding head and grinding seat 31 to rotate. The grinding seat 31 and screw conveyor 32 are used to stir the material, ensuring efficient drying. Next, modified phenolic resin is added to the mixing box 16 and mixed for 5-10 minutes. Then, high-purity magnesia, tar, alumina, bentonite, and asphalt are added and mixed at 90-110℃ for 25-35 minutes. The grinding base 31 and the screening plate 33 work together to grind the material. During the rotary grinding, the screw conveyor 32 is intermittently turned on to transport the material between the grinding base 31 and the screening plate 33 to the top of the material, so that other mixed materials can be ground, ensuring the uniformity of grinding. After grinding is completed, the sealing mechanism is turned on, so that the mixed material falls from the screening hole into the material chamber. At the same time, the rotary motor 39 is turned on, which drives the magnetic plate 45 and the non-magnetic plate 44 to rotate. The magnetic plate 45 collects iron filings and other impurities in the mixed material, and then rotates into the waste box 36. The scraper cover 37 scrapes the iron filings off the magnetic plate 45 and they fall into the waste box 36, completing the impurity removal operation of the mixed material and ensuring the purity of the mixed material. This structure has a good impurity removal effect and high efficiency.

[0042] The sealing assembly includes a sealing frame 34, with a slip ring 43 fixed to the outer periphery of the sealing frame 34. An annular groove is provided inside the mixing box 16, and the slip ring 43 is rotatably connected to the annular groove. A drive motor 40 is fixed to the bottom of the mixing box 16, and a drive shaft 41 is fixed to the output shaft end of the drive motor 40. The drive shaft 41 is fixedly connected to the sealing frame 34. The sealing frame 34 is composed of several annularly distributed sealing plates 42.

[0043] When grinding and mixing materials, the blocking plate 42 blocks the screening holes on the screening plate 33. After grinding and mixing are completed, the drive motor 40 drives the drive shaft 41 to rotate, thereby driving the blocking frame 34 to rotate, so that the blocking plate 42 deviates from the screening holes, allowing the mixed material to fall. The structure is simple, the degree of automation is high, and the difficulty of the work is reduced.

[0044] The stirring mechanism includes a grinding motor 19, a grinding shaft 20 is fixed to the output shaft end of the grinding motor 19, and a small stirring plate 21 is fixed to the outer periphery of the grinding shaft 20.

[0045] With the above structure, when peeling the refractory material, the grinding motor 19 drives the grinding shaft 20 and the disturbance plate 21 to rotate, so that the internal abrasives peel the refractory material, thereby removing the impurities on the outside of the refractory material and improving the quality of subsequent processing.

[0046] The discharge mechanism includes a filter screen 22. The interior of the grinding box 1 has a sliding cavity. A first electric telescopic rod 23 is fixed inside the sliding cavity. The telescopic end of the first electric telescopic rod 23 is fixed with the filter screen 22. The filter screen 22 is located inside the discharge port. The lower end of the grinding box 1 is fixed with a discharge motor 24. The output shaft end of the discharge motor 24 is fixed with a connecting frame 25. A sealing plate 26 is fixed on the connecting frame 25. The sealing plate 26 abuts against the lower end of the discharge port.

[0047] After peeling, the discharge motor 24 drives the sealing plate 26 to detach from the discharge port, and the abrasive is discharged through the discharge port. The filter screen 22 blocks the refractory material. After the abrasive is discharged, the first electric telescopic rod 23 drives the filter screen 22 to open, and the refractory material is fed into the conveying mechanism. The operation is simple and convenient, and it is easy to separate the refractory material from the abrasive.

[0048] The material conveying assembly includes a mounting frame 8 and a slide rail 2. The slide rail 2 is located at the lower end of the grinding box 1. A movable seat 3 is slidably connected to the slide rail 2. An electric wheel is provided on the movable seat 3. A support column 4 is fixed to the upper end of the movable seat 3. A connecting seat 5 is inserted into the upper end of the support column 4. A conveying box 6 is fixed to the connecting seat 5. Square seats 7 are fixed to the left and right ends of the conveying box 6. A square opening is provided on the directional seat. The mounting frame 8 is fixed to the grinding box 1 and the crushing box 14. A moving motor 9 is fixed to the mounting frame 8. A threaded rod 10 is fixed to the output shaft end of the moving motor 9. A translation seat 11 is threadedly connected to the threaded rod 10. Two second electric telescopic rods 12 are fixed to the lower side of the translation seat 11. A tilting motor 13 is fixed to the telescopic end of the second electric telescopic rod 12. A third electric telescopic rod 17 is fixed to the output shaft end of the tilting motor 13. A tilting block 18 is fixed to the telescopic end of the third electric telescopic rod 17.

[0049] Initially, the conveyor box 6 is placed below the discharge port to receive the refractory material. After receiving, it moves to the right using an electric wheel. Then, the second electric telescopic rod 12 drives the tilting block 18 to descend. After aligning the tilting block 18 with the square opening, the third electric rod sends the tilting block 18 into the directional opening. Then, using the cooperation of the second electric telescopic rod 12 and the moving motor 9, the conveyor box 6 is moved above the feed hopper of the crushing box 14. The tilting motor 13 drives the conveyor box 6 to tilt, thus feeding the material. Then, the conveyor box 6 is placed back on the moving seat 3. The process is highly automated and saves time and effort.

[0050] Experimental Example Under the same raw material ratio, the performance of the magnesia-carbon bricks in this embodiment was tested. Ten samples were prepared for each experimental example, dried at 200℃ to constant weight, and then vacuum-sealed to test the bulk density and porosity. Ten samples were also prepared for each experimental example, dried at 200℃ to constant weight, and the compressive strength at room temperature was tested. The results of the physicochemical index tests are as follows: Figure 8 As shown.

[0051] Experimental Example 1: The heating and drying temperature was 80℃, the drying time was 40 min, the modified phenolic resin was added and mixed for 8 minutes, then high-purity magnesia, tar, alumina, bentonite and asphalt were added, the mixing temperature was 100℃, the mixing time was 30 min, and the high-pressure molding temperature was 1250℃ in a high-temperature tunnel kiln for 8 hours.

[0052] Experimental Example 2: The heating and drying temperature was 7℃, the drying time was 50min, the modified phenolic resin was added and mixed for 5 minutes, then high-purity magnesia, tar, alumina, bentonite and asphalt were added, the mixing temperature was 110℃, the mixing time was 25min; the high-pressure molding temperature was 1400℃ and the firing was carried out in a high-temperature tunnel kiln for 7h.

[0053] Experimental Example 3: The heating and drying temperature was 90℃, the drying time was 30 min, the modified phenolic resin was added and mixed for 10 min, then high-purity magnesia, tar, alumina, bentonite and asphalt were added, the mixing temperature was 90℃, the mixing time was 35 min; the high-pressure molding temperature was 1100℃ and the firing was carried out in a high-temperature tunnel kiln for 9 h.

[0054] Experiments 1 to 3 were identical except for the data mentioned above.

[0055] According to experimental data, the physicochemical properties of the magnesia-carbon bricks prepared using the preparation process and equipment of this invention are excellent, exceeding the level of normal magnesia-carbon bricks. They can be applied to the working layer of dry vibrating materials, coating materials, and insulation boards, achieving the goal of turning waste into treasure.

[0056] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A method of preparing magnesia-carbon brick from recycled refractories, characterized by, The method comprises the following steps: S1, the recycled refractory is put into a grinding box to perform peeling operation by using sandpaper to obtain regenerated material; S2, the regenerated material after peeling is sent into a crushing box by a feeding mechanism to perform crushing to obtain regenerated granular material; S3, the regenerated granular material is sent into a mixing box to first perform heating and drying, the heating temperature is 70-90℃, and the drying time is 30-50min; S4, modified phenolic resin is first added into the mixing box and mixed for 5-10min, then high-purity magnesia, tar, alumina, bentonite and pitch are added, and mixing is performed at 90110℃ for 2535min; S5, the obtained mixture is subjected to high-pressure forming, and is fired in a high-temperature tunnel kiln at 11001400℃ for 79h, and after cooling, regenerated magnesia-carbon brick is obtained.

2. A method of preparing MgO-C brick from recycled refractories according to claim 1, characterized in that, The heating and drying condition in the step S3 is that the temperature rising rate is 510℃ / min.

3. A method of preparing MgO-C brick from recycled refractories according to claim 1, characterized in that, The pressure range of the high-pressure forming in the step S5 is 150-350Mpa.

4. A method of preparing MgO-C brick from recycled refractories according to claim 1, characterized in that, The weight ratio in the step S4 is that the regenerated granular material is 3040 parts, the high-purity magnesia is 2545 parts, the phenolic resin is 1520 parts, the tar is 35 parts, the alumina is 810 parts, the bentonite is 510 parts, and the pitch is 46 parts.

5. A plant for the production of magnesia-carbon bricks from recycled refractory materials according to any one of claims 1-4, characterized in that, The utility model relates to a grinding box (1), crushing box (14), mixing box (16) and sundry box (36) are included, be provided with stirring mechanism in grinding box (1), the lower end of grinding box (1) is equipped with discharge gate, be equipped with discharge mechanism on discharge gate, be equipped with feed mechanism between grinding box (1) and crushing box (14), be equipped with spiral feeder (15) between crushing box (14) and mixing box (16), the upper end of mixing box (16) is fixed with feeding hopper (27), the upper end of mixing box (16) is fixed with mixing motor (28), the output shaft end of mixing motor (28) is fixed with rotating cylinder (29), rotating cylinder (29) is slidably connected with rotating column (30) through slide rail (2) in the inside, the lower end of rotating column (30) is fixed with grinding seat (31), the inside of mixing box (16) is fixed with screening plate (33) with grinding seat (31) cooperation, the screening hole on screening plate (33) is annular distribution and has multiple rows, the inside of mixing box (16) is provided with the blocking mechanism with screening plate (33) cooperation, the downside of screening plate (33) and mixing box (16) between form material cavity, be equipped with the communicating port between sundry box (36) and material cavity, the inside of mixing box (16) is fixed with rotating motor (39), the output shaft end of rotating motor (39) is fixed with the circular plate (38) in communicating port, the periphery of circular plate (38) is fixed with a plurality of magnetic plate (45) and non -magnetic board (44), magnetic plate (45) and non -magnetic board (44) staggered arrangement, the inside of sundry box (36) is fixed with scraping cover (37), the inside of scraping cover (37) and the upper and lower two sides of magnetic plate (45) and non -magnetic board (44) are in contact, a plurality of leakage holes (46) are equipped on non -magnetic board (44), the inside of grinding seat (31) is fixed with a plurality of heating rods (35), the inside of grinding seat (31) is fixed with a plurality of spiral conveyors (32), the spiral conveying blade lower end of spiral conveyor (32) extends the lower end of grinding seat (31), the discharge gate of spiral conveyor (32) is located in the inner upper portion of mixing box (16), the lower end of mixing box (16) is fixed with the downcomer.

6. The apparatus for preparing magnesium-carbon brick from recycled refractories according to claim 1, wherein The blocking assembly includes a blocking frame (34), a slip ring (43) is fixed to the periphery of the blocking frame (34), an annular groove is formed in the interior of the mixing box (16), the slip ring (43) is rotatably connected to the annular groove, a drive motor (40) is fixed to the bottom of the mixing box (16), a drive shaft (41) is fixed to the output shaft of the drive motor (40), the drive shaft (41) is fixedly connected to the blocking frame (34), and the blocking frame (34) is composed of a plurality of annular blocking plates (42).

7. The apparatus for preparing magnesia carbon brick from recycled refractories as claimed in claim 5 wherein, The stirring mechanism includes a grinding motor (19), a grinding shaft (20) is fixed to the output shaft of the grinding motor (19), and a plurality of disturbance plates (21) are fixed to the periphery of the grinding shaft (20).

8. The apparatus for preparing magnesium-carbon brick from recycled refractories according to claim 5, wherein The discharging mechanism comprises a filter screen (22), the inside of the polishing box (1) is provided with a sliding cavity, the inside of the sliding cavity is fixedly provided with a first electric telescopic rod (23), the telescopic end of the first electric telescopic rod (23) is fixedly provided with the filter screen (22), the filter screen (22) is located in the discharge port, the lower end of the polishing box (1) is fixedly provided with a discharging motor (24), the output shaft end of the discharging motor (24) is fixedly provided with a connecting frame (25), the connecting frame (25) is fixedly provided with a closing plate (26), and the closing plate (26) abuts against the lower end of the discharge port.

9. The apparatus for preparing magnesium-carbon brick from recycled refractories according to claim 5, wherein The material conveying assembly comprises a mounting frame (8) and a sliding rail (2), the sliding rail (2) is located at the lower end of the polishing box (1), the sliding rail (2) is slidably connected with a moving seat (3), the moving seat (3) is provided with an electric wheel, the upper end of the moving seat (3) is fixedly provided with a support column (4), the upper end of the support column (4) is inserted with a connecting seat (5), the connecting seat (5) is fixedly provided with a conveying box (6), the left and right ends of the conveying box (6) are fixedly provided with square seats (7), the square seats (7) are provided with square openings, the mounting frame (8) is fixed on the polishing box (1) and the crushing box (14), the mounting frame (8) is fixedly provided with a moving motor (9), the output shaft end of the moving motor (9) is fixedly provided with a threaded rod (10), the threaded rod (10) is threadedly connected with a translation seat (11), the lower side of the translation seat (11) is fixedly provided with two second electric telescopic rods (12), the telescopic end of the second electric telescopic rod (12) is fixedly provided with a turnover motor (13), the output shaft end of the turnover motor (13) is fixedly provided with a third electric telescopic rod (17), and the telescopic end of the third electric telescopic rod (17) is fixedly provided with a turnover block (18).

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