Lightweight sintered brick prepared from waste felt carbon fiber and processing technology thereof

Abstract

The application discloses a kind of light sintered brick prepared by waste felt carbon fiber and processing technology thereof, it is related to carbon material technical field, to improve the reuse of waste felt carbon fiber, the raw material of sintered brick is modified by the present application, by forming silicon carbide layer on the surface of carbon fiber, thereby realizing the effective protection of carbon fiber matrix, thereby avoiding the oxidation of carbon fiber at high temperature, and, since carbon fiber material belongs to ridge material, to avoid the decrease of bonding strength and mechanical strength of sintered brick during sintering process, therefore boron mud component is also added in the present application, boron mud is an industrial solid waste residue generated in the production of borax and boric acid, which contains a lot of amorphous substances, adding it to the raw material can effectively improve the wettability of carbon fiber, so that carbon fiber and sintered brick are better combined together, and the bending strength of sintered brick is improved.

Description

Technical Field

[0001] This invention relates to the field of carbon materials technology, specifically to a lightweight sintered brick prepared from waste felt carbon fiber and its processing technology. Background Technology

[0002] Carbon fiber felt is a thermal insulation material formed by bonding and curing carbon fibers with a bonding resin. It is widely used in thermal insulation projects in industry and transportation. Although carbon fibers have good mechanical properties and high temperature resistance, and can withstand temperatures of several hundred degrees Celsius with stable properties, the properties of the bonding resin itself are limited. Under long-term high-temperature environments, the bonding resin will deteriorate, leading to a continuous decrease in the strength of the carbon fiber felt and defects such as shedding. This makes it unable to meet the requirements of thermal insulation projects. Directly discarding and landfilling waste carbon fiber felt would undoubtedly cause huge waste. Therefore, it is necessary to study the reuse of waste carbon fiber felt. Summary of the Invention

[0003] The purpose of this invention is to provide a lightweight sintered brick prepared from waste felt carbon fiber and its processing technology, so as to solve the problems raised in the prior art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a processing method for lightweight sintered bricks prepared using waste felt carbon fibers, comprising the following steps:

[0005] S1. Waste carbon fiber felt is sheared and crushed to obtain a mixture of waste carbon fiber.

[0006] S2. Under a nitrogen atmosphere, the waste carbon fiber mixture is heated to 450~500℃ and held for 25~40 min. Then, it is cooled to 300~350℃, air is introduced, and it is held for 10~15 min. After cooling to room temperature, the calcined waste carbon fiber mixture is added to clean water and ultrasonically treated to remove residual carbon powder on the surface. After separation and drying, it is added again to a mixture of concentrated sulfuric acid and concentrated nitric acid, heated to 60℃, ultrasonically vibrated for 20~40 min, centrifuged to separate the precipitate, washed until neutral, and dried to obtain recycled carbon fiber.

[0007] S3. Add the recycled carbon fiber to anhydrous ethanol, add KH550, mix well, add deionized water, and continue to add dilute hydrochloric acid to adjust the pH of the mixture to 2.5~3.5. After ultrasonic vibration reaction for 12 hours, dry to constant weight, heat to 350~400℃ under nitrogen atmosphere and hold for 10~15 minutes, then heat to 980~1050℃, introduce methane gas, hold for 1~4 hours, and cool to room temperature to obtain modified recycled carbon fiber.

[0008] S4. After crushing and sieving coal gangue, bentonite, red mud and boron mud respectively, they are mixed with modified recycled carbon fiber to obtain dry mixture. After adding binder, a semi-wet blank is prepared. After blanking, it is placed in an environment of 20~25℃ and 85~95% relative humidity for 3~5 days to age. After sintering, a lightweight sintered brick made from waste felt carbon fiber is obtained.

[0009] Furthermore, in step S1, the particle size length of the waste carbon fiber mixture in each direction is 5~25mm.

[0010] Furthermore, in step S2, the mixed acid is a mixed acid solution of concentrated sulfuric acid and concentrated nitric acid in a volume ratio of 3:1.

[0011] Furthermore, in step S3, the amount of each component added, by weight, is 1 part of recycled carbon fiber, 3-5 parts of anhydrous ethanol, 0.1-0.4 parts of KH550, and 0.5-1.5 parts of deionized water.

[0012] Furthermore, in step S4, the coal gangue, after being crushed, has a particle size of 1-3 mm; the bentonite, red mud, and borax mud, after being crushed, have a particle size of 0.05-0.1 mm.

[0013] Furthermore, in step S4, the contents of each component by weight are 20-35 parts coal gangue, 20-30 parts bentonite, 5-10 parts red mud, 5-10 parts boron mud and 5-15 parts modified recycled carbon fiber.

[0014] Furthermore, in step S4, the adhesive is an aqueous solution of carboxymethyl cellulose, wherein the concentration of carboxymethyl cellulose is 2-4 wt%.

[0015] The amount of adhesive added is 12-15 wt% of the dry mix.

[0016] Furthermore, in step S4, during sintering, the brick blank is heated to 250-300℃ at a rate of 2-3℃ / min, held for 15-30min, then heated to 800-950℃ at a rate of 1-2℃ / min, and then heated again to 1050-1150℃ at a rate of 0.5-1℃ / min, held for 30-45min, and then cooled to room temperature in the furnace to obtain a lightweight sintered brick prepared using waste felt carbon fiber.

[0017] Furthermore, a lightweight sintered brick prepared using waste felt carbon fiber is obtained by the above method.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] This invention aims to improve the reuse of waste felt carbon fiber by modifying it as a raw material for sintered bricks. Since sintered bricks require high-temperature sintering at thousands of degrees Celsius during preparation, carbon fiber materials are often oxidized by air at this temperature, leading to performance degradation and even consumption. Therefore, to avoid oxidation loss of carbon fiber during sintering, this invention, after the old carbon fiber felt has been crushed and sheared, heats it to 450-500°C in a nitrogen atmosphere to remove surface resin. Then, it is cooled to about 300°C and placed in an air atmosphere to further remove resin residue. Afterward, it undergoes acid etching oxidation treatment to increase its surface hydroxyl content. Finally, it is mixed with KH550 and subjected to water... After the silica gel is formed, it is heated and methane gas is introduced to generate a silicon carbide layer on the surface of the carbon fiber. The silicon carbide layer can effectively protect the carbon fiber matrix, thereby preventing the carbon fiber from oxidizing at high temperatures. Furthermore, since carbon fiber is a brittle material, in order to avoid the decrease in bonding strength and mechanical strength of the sintered brick during the sintering process, this application also adds a boron mud component. Boron mud is an industrial solid waste generated during the production of borax and boric acid, which contains a large amount of amorphous substances. Adding it to the raw material can effectively improve the wettability of the carbon fiber, thereby better bonding the carbon fiber and the sintered brick and improving the flexural strength of the sintered brick. Detailed Implementation

[0020] Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Example 1. A processing method for lightweight sintered bricks prepared using waste felt carbon fiber, comprising the following steps:

[0022] S1. After shearing and crushing the waste carbon fiber felt, a mixture of waste carbon fiber with a particle size of 15~20mm in each direction is obtained;

[0023] S2. The waste carbon fiber mixture is heated to 450℃ under a nitrogen atmosphere, held for 25 minutes, cooled to 300℃, air is introduced, held for 15 minutes, and then cooled to room temperature. The calcined waste carbon fiber mixture is added to clean water, ultrasonically treated to remove residual carbon powder on the surface, separated and dried, and then added again to a mixed acid of concentrated sulfuric acid and concentrated nitric acid in a volume ratio of 3:1. The mixture is heated to 60℃, ultrasonically vibrated for 20 minutes, centrifuged to separate the precipitate, washed until neutral, and dried to obtain recycled carbon fiber.

[0024] S3. By weight, 1 part of recycled carbon fiber was added to 5 parts of anhydrous ethanol, 0.1 part of KH550 was added, and after mixing evenly, 0.5 part of deionized water was added, followed by the addition of dilute hydrochloric acid. The pH of the mixture was adjusted to 3, and the mixture was ultrasonically vibrated for 12 hours. After drying to constant weight, the mixture was heated to 350℃ and held for 15 minutes under a nitrogen atmosphere. Then, the temperature was raised to 980℃, methane gas was introduced, and the mixture was held for 4 hours. Finally, the mixture was cooled to room temperature to obtain modified recycled carbon fiber.

[0025] S4. By weight, 20 parts of coal gangue were crushed and sieved to obtain coal gangue particles with a particle size of 1-3 mm; 20 parts of bentonite, 5 parts of red mud and 5 parts of boron mud were crushed and sieved to obtain bentonite particles, red mud particles and boron mud particles with a particle size of 0.05-0.1 mm. These were then mixed with 5 parts of modified recycled carbon fiber. A 2wt% carboxymethyl aqueous solution was added at 15% of the dry mixture mass to prepare a semi-wet blank. After the blank was shaped, it was aged in an environment of 20℃ and 85% relative humidity for 3 days. The blank was then sintered. During sintering, the blank was heated to 300℃ at 2℃ / min, held for 15 min, then heated to 850℃ at 2℃ / min, and then heated to 1100℃ again at a rate of 0.5℃ / min, held for 30 min, and then cooled to room temperature in the furnace to obtain a lightweight sintered brick made from waste felt carbon fiber.

[0026] Example 2. A processing method for lightweight sintered bricks prepared using waste felt carbon fiber, comprising the following steps:

[0027] Compared with Example 1, this example increases the amount of KH550 added in step S3;

[0028] S1. After shearing and crushing the waste carbon fiber felt, a mixture of waste carbon fiber with a particle size of 15~20mm in each direction is obtained;

[0029] S2. The waste carbon fiber mixture is heated to 450℃ under a nitrogen atmosphere, held for 25 minutes, cooled to 300℃, air is introduced, held for 15 minutes, and then cooled to room temperature. The calcined waste carbon fiber mixture is added to clean water, ultrasonically treated to remove residual carbon powder on the surface, separated and dried, and then added again to a mixed acid of concentrated sulfuric acid and concentrated nitric acid in a volume ratio of 3:1. The mixture is heated to 60℃, ultrasonically vibrated for 20 minutes, centrifuged to separate the precipitate, washed until neutral, and dried to obtain recycled carbon fiber.

[0030] S3. By weight, add 1 part of recycled carbon fiber to 5 parts of anhydrous ethanol, add 0.4 parts of KH550, mix well, add 0.5 parts of deionized water, continue to add dilute hydrochloric acid, adjust the pH of the mixture to 3, ultrasonically vibrate for 12 hours, dry to constant weight, heat to 350℃ and hold for 15 minutes under nitrogen atmosphere, heat to 980℃, introduce methane gas, hold for 4 hours, cool to room temperature, and obtain modified recycled carbon fiber.

[0031] S4. By weight, 20 parts of coal gangue were crushed and sieved to obtain coal gangue particles with a particle size of 1-3 mm; 20 parts of bentonite, 5 parts of red mud and 5 parts of boron mud were crushed and sieved to obtain bentonite particles, red mud particles and boron mud particles with a particle size of 0.05-0.1 mm. These were then mixed with 5 parts of modified recycled carbon fiber. A 2wt% carboxymethyl aqueous solution was added at 15% of the dry mixture mass to prepare a semi-wet blank. After the blank was shaped, it was aged in an environment of 20℃ and 85% relative humidity for 3 days. The blank was then sintered. During sintering, the blank was heated to 300℃ at 2℃ / min, held for 15 min, then heated to 850℃ at 2℃ / min, and then heated to 1100℃ again at a rate of 0.5℃ / min, held for 30 min, and then cooled to room temperature in the furnace to obtain a lightweight sintered brick made from waste felt carbon fiber.

[0032] Example 3. A processing method for lightweight sintered bricks prepared using waste felt carbon fiber, comprising the following steps:

[0033] Compared with Example 2, this example increases the amount of modified recycled carbon fiber added in step S4;

[0034] S1. After shearing and crushing the waste carbon fiber felt, a mixture of waste carbon fiber with a particle size of 15~20mm in each direction is obtained;

[0035] S2. The waste carbon fiber mixture is heated to 450℃ under a nitrogen atmosphere, held for 25 minutes, cooled to 300℃, air is introduced, held for 15 minutes, and then cooled to room temperature. The calcined waste carbon fiber mixture is added to clean water, ultrasonically treated to remove residual carbon powder on the surface, separated and dried, and then added again to a mixed acid of concentrated sulfuric acid and concentrated nitric acid in a volume ratio of 3:1. The mixture is heated to 60℃, ultrasonically vibrated for 20 minutes, centrifuged to separate the precipitate, washed until neutral, and dried to obtain recycled carbon fiber.

[0036] S3. By weight, add 1 part of recycled carbon fiber to 5 parts of anhydrous ethanol, add 0.4 parts of KH550, mix well, add 0.5 parts of deionized water, continue to add dilute hydrochloric acid, adjust the pH of the mixture to 3, ultrasonically vibrate for 12 hours, dry to constant weight, heat to 350℃ and hold for 15 minutes under nitrogen atmosphere, heat to 980℃, introduce methane gas, hold for 4 hours, cool to room temperature, and obtain modified recycled carbon fiber.

[0037] S4. By weight, 20 parts of coal gangue were crushed and sieved to obtain coal gangue particles with a particle size of 1-3 mm; 20 parts of bentonite, 5 parts of red mud and 5 parts of boron mud were crushed and sieved to obtain bentonite particles, red mud particles and boron mud particles with a particle size of 0.05-0.1 mm. These were then mixed with 15 parts of modified recycled carbon fiber. A 2wt% carboxymethyl aqueous solution was added at 15% of the dry mixture mass to prepare a semi-wet blank. After the blank was shaped, it was aged in an environment of 20℃ and 85% relative humidity for 3 days. The blank was then sintered. During sintering, the blank was heated to 300℃ at 2℃ / min, held for 15 min, then heated to 850℃ at 2℃ / min, and then heated to 1100℃ again at a rate of 0.5℃ / min, held for 30 min, and then cooled to room temperature in the furnace to obtain a lightweight sintered brick made from waste felt carbon fiber.

[0038] Example 4. A processing method for lightweight sintered bricks prepared using waste felt carbon fiber, comprising the following steps:

[0039] Compared with Example 3, this example increases the amount of boron mud added in step S4;

[0040] S1. After shearing and crushing the waste carbon fiber felt, a mixture of waste carbon fiber with a particle size of 15~20mm in each direction is obtained;

[0041] S2. The waste carbon fiber mixture is heated to 450℃ under a nitrogen atmosphere, held for 25 minutes, cooled to 300℃, air is introduced, held for 15 minutes, and then cooled to room temperature. The calcined waste carbon fiber mixture is added to clean water, ultrasonically treated to remove residual carbon powder on the surface, separated and dried, and then added again to a mixed acid of concentrated sulfuric acid and concentrated nitric acid in a volume ratio of 3:1. The mixture is heated to 60℃, ultrasonically vibrated for 20 minutes, centrifuged to separate the precipitate, washed until neutral, and dried to obtain recycled carbon fiber.

[0042] S3. By weight, add 1 part of recycled carbon fiber to 5 parts of anhydrous ethanol, add 0.4 parts of KH550, mix well, add 0.5 parts of deionized water, continue to add dilute hydrochloric acid, adjust the pH of the mixture to 3, ultrasonically vibrate for 12 hours, dry to constant weight, heat to 350℃ and hold for 15 minutes under nitrogen atmosphere, heat to 980℃, introduce methane gas, hold for 4 hours, cool to room temperature, and obtain modified recycled carbon fiber.

[0043] S4. By weight, 20 parts of coal gangue were crushed and sieved to obtain coal gangue particles with a particle size of 1-3 mm; 20 parts of bentonite, 5 parts of red mud and 10 parts of boron mud were crushed and sieved to obtain bentonite particles, red mud particles and boron mud particles with a particle size of 0.05-0.1 mm. These were then mixed with 15 parts of modified recycled carbon fiber. A 2wt% carboxymethyl aqueous solution was added at 15% of the dry mixture mass to prepare a semi-wet blank. After the blank was shaped, it was aged in an environment of 20℃ and 85% relative humidity for 3 days. The blank was then sintered. During sintering, the blank was heated to 300℃ at 2℃ / min, held for 15 min, then heated to 850℃ at 2℃ / min, and then heated to 1100℃ again at a rate of 0.5℃ / min, held for 30 min, and then cooled to room temperature in the furnace to obtain a lightweight sintered brick made from waste felt carbon fiber.

[0044] Comparative Example 1. A processing method for lightweight sintered bricks prepared using waste felt carbon fiber, comprising the following steps:

[0045] Compared with Example 1, no boron mud was added in this comparative example;

[0046] S1. After shearing and crushing the waste carbon fiber felt, a mixture of waste carbon fiber with a particle size of 15~20mm in each direction is obtained;

[0047] S2. The waste carbon fiber mixture is heated to 450℃ under a nitrogen atmosphere, held for 25 minutes, cooled to 300℃, air is introduced, held for 15 minutes, and then cooled to room temperature. The calcined waste carbon fiber mixture is added to clean water, ultrasonically treated to remove residual carbon powder on the surface, separated and dried, and then added again to a mixed acid of concentrated sulfuric acid and concentrated nitric acid in a volume ratio of 3:1. The mixture is heated to 60℃, ultrasonically vibrated for 20 minutes, centrifuged to separate the precipitate, washed until neutral, and dried to obtain recycled carbon fiber.

[0048] S3. By weight, 1 part of recycled carbon fiber was added to 5 parts of anhydrous ethanol, 0.1 part of KH550 was added, and after mixing evenly, 0.5 part of deionized water was added, followed by the addition of dilute hydrochloric acid. The pH of the mixture was adjusted to 3, and the mixture was ultrasonically vibrated for 12 hours. After drying to constant weight, the mixture was heated to 350℃ and held for 15 minutes under a nitrogen atmosphere. Then, the temperature was raised to 980℃, methane gas was introduced, and the mixture was held for 4 hours. Finally, the mixture was cooled to room temperature to obtain modified recycled carbon fiber.

[0049] S4. By weight, 20 parts of coal gangue were crushed and sieved to obtain coal gangue particles with a particle size of 1-3 mm; 20 parts of bentonite and 5 parts of red mud were crushed and sieved to obtain bentonite particles and red mud particles with a particle size of 0.05-0.1 mm. These were then mixed with 5 parts of modified recycled carbon fiber. A 2wt% carboxymethyl aqueous solution was added at 15% of the dry mixture mass to prepare a semi-wet blank. After the blank was shaped, it was aged in an environment of 20℃ and 85% relative humidity for 3 days. The blank was then sintered. During sintering, the blank was heated to 300℃ at 2℃ / min and held for 15 min. Then, it was heated to 850℃ at 2℃ / min and then heated to 1100℃ again at a rate of 0.5℃ / min and held for 30 min. Finally, it was cooled to room temperature in the furnace to obtain a lightweight sintered brick made from waste felt carbon fiber.

[0050] Comparative Example 2. A processing method for lightweight sintered bricks prepared using waste felt carbon fiber, comprising the following steps:

[0051] Compared with Example 1, this comparative example did not perform the original step S3.

[0052] S1. After shearing and crushing the waste carbon fiber felt, a mixture of waste carbon fiber with a particle size of 15~20mm in each direction is obtained;

[0053] S2. The waste carbon fiber mixture is heated to 450℃ under a nitrogen atmosphere, held for 25 minutes, cooled to 300℃, air is introduced, held for 15 minutes, and then cooled to room temperature. The calcined waste carbon fiber mixture is added to clean water, ultrasonically treated to remove residual carbon powder on the surface, separated and dried, and then added again to a mixed acid of concentrated sulfuric acid and concentrated nitric acid in a volume ratio of 3:1. The mixture is heated to 60℃, ultrasonically vibrated for 20 minutes, centrifuged to separate the precipitate, washed until neutral, and dried to obtain recycled carbon fiber.

[0054] S3. By weight, 20 parts of coal gangue were crushed and sieved to obtain coal gangue particles with a particle size of 1-3 mm; 20 parts of bentonite, 5 parts of red mud and 5 parts of boron mud were crushed and sieved to obtain bentonite particles, red mud particles and boron mud particles with a particle size of 0.05-0.1 mm. These were then mixed with 5 parts of recycled carbon fiber. A 2wt% carboxymethyl aqueous solution was added at 15% of the dry mixture mass to prepare a semi-wet blank. After the blank was shaped, it was aged in an environment of 20℃ and 85% relative humidity for 3 days. The blank was then sintered. During sintering, the blank was heated to 300℃ at 2℃ / min, held for 15 min, then heated to 850℃ at 2℃ / min, and then heated to 1100℃ again at a rate of 0.5℃ / min, held for 30 min, and then cooled to room temperature in the furnace to obtain a lightweight sintered brick made from waste felt carbon fiber.

[0055] Comparative Example 3. A processing method for lightweight sintered bricks prepared using waste felt carbon fiber, comprising the following steps:

[0056] Compared to Example 1, no carbon fiber was added in this comparative example;

[0057] By weight, 20 parts of coal gangue were crushed and sieved to obtain coal gangue particles with a particle size of 1-3 mm; 20 parts of bentonite, 5 parts of red mud and 5 parts of boron mud were crushed and sieved separately to obtain bentonite particles, red mud particles and boron mud particles with a particle size of 0.05-0.1 mm. These were then mixed with 5 parts of recycled carbon fiber. A 2wt% carboxymethyl aqueous solution was added at 15% of the dry mixture mass to prepare a semi-wet blank. After the blank was shaped, it was aged in an environment of 20℃ and 85% relative humidity for 3 days. The blank was then sintered. During sintering, the blank was heated to 300℃ at 2℃ / min, held for 15 min, then heated to 850℃ at 2℃ / min, and then heated again to 1100℃ at a rate of 0.5℃ / min, held for 30 min, and then cooled to room temperature in the furnace to obtain a lightweight sintered brick made from waste felt carbon fiber.

[0058] Testing: The flexural strength and splitting tensile strength of the lightweight sintered bricks prepared in Examples 1-4 and Comparative Examples 1-3 were tested according to GB / T 25993-2010; the test results are shown in the table below.

[0059]

[0060] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A processing technology for lightweight sintered bricks prepared using waste felt carbon fiber, characterized in that, Includes the following steps: S1. Waste carbon fiber felt is sheared and crushed to obtain a mixture of waste carbon fiber. The particle size length of the waste carbon fiber mixture in each direction is 5~25mm; S2. Under a nitrogen atmosphere, the waste carbon fiber mixture is heated to 450~500℃ and held for 25~40 min. Then, it is cooled to 300~350℃, air is introduced, and it is held for 10~15 min. After cooling to room temperature, the calcined waste carbon fiber mixture is added to clean water and ultrasonically treated to remove residual carbon powder on the surface. After separation and drying, it is added again to a mixture of concentrated sulfuric acid and concentrated nitric acid, heated to 60℃, ultrasonically vibrated for 20~40 min, centrifuged to separate the precipitate, washed until neutral, and dried to obtain recycled carbon fiber. The mixed acid is a mixed acid solution of concentrated sulfuric acid and concentrated nitric acid in a volume ratio of 3:1; S3. Add the recycled carbon fiber to anhydrous ethanol, add KH550, mix well, add deionized water, and continue to add dilute hydrochloric acid to adjust the pH of the mixture to 2.5~3.

5. After ultrasonic vibration reaction for 12 hours, dry to constant weight, heat to 350~400℃ under nitrogen atmosphere and hold for 10~15 minutes, then heat to 980~1050℃, introduce methane gas, hold for 1~4 hours, and cool to room temperature to obtain modified recycled carbon fiber. The composition, by weight, consists of 1 part recycled carbon fiber, 3-5 parts anhydrous ethanol, 0.1-0.4 parts KH550, and 0.5-1.5 parts deionized water. S4. After crushing and sieving coal gangue, bentonite, red mud and boron mud respectively, they are mixed with modified recycled carbon fiber to obtain dry mixture. After adding binder, a semi-wet blank is prepared. After blanking, it is placed in an environment of 20~25℃ and 85~95% relative humidity for 3~5 days. The brick blank is then sintered. During sintering, the brick blank is heated to 250~300℃ at 2~3℃ / min and held for 15~30min. Then, it is heated to 800~950℃ at 1~2℃ / min and then heated to 1050~1150℃ at 0.5~1℃ / min and held for 30~45min. After cooling to room temperature in the furnace, a lightweight sintered brick made from waste felt carbon fiber is obtained after sintering. Among them, the particle size of coal gangue after crushing is 1~3mm; the particle size of bentonite, red mud and boron mud after crushing is 0.05~0.1mm. By weight, the contents of each component are 20-35 parts coal gangue, 20-30 parts bentonite, 5-10 parts red mud, 5-10 parts boron mud and 5-15 parts modified recycled carbon fiber.

2. The processing technology for lightweight sintered bricks prepared using waste felt carbon fiber according to claim 1, characterized in that: In step S4, the adhesive is an aqueous solution of carboxymethyl cellulose, wherein the concentration of carboxymethyl cellulose is 2-4 wt%. The amount of adhesive added is 12-15 wt% of the dry mix.

3. A lightweight sintered brick prepared from waste felt carbon fiber using the processing technology described in any one of claims 1 to 2.

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