Carbon block for slicing and forming method thereof

Abstract

The invention provides a carbon block for slicing and a forming method thereof, and relates to the technical field of carbon block production, the raw materials comprise a first coke material, a second coke material, a third coke material, a fourth coke material, a fifth coke material, asphalt and modified powder; the modified powder is graphite powder, and the final temperature of a flame path is controlled to be 1140-1160 DEG C in the roasting process. According to the preparation method, the graphite powder modified powder is added in the carbon block forming process, meanwhile, the roasting process is adjusted, and the final temperature of a flame path is increased, so that the resistivity of the carbon block for slicing is as low as 50 omega.m, and the carbon block serves as a carrier for calcining a negative electrode material, so that energy is saved in the calcining process.

Description

Technical Field

[0001] The invention relates to the technical field of carbon block production, in particular to a carbon block for slicing and a forming method thereof. Background Art

[0002] Carbon block is an important metallurgical furnace structural material, mainly used for the construction of aluminum electrolytic cells, blast furnaces, ferroalloy furnaces, etc. They are usually made of anthracite and metallurgical coke as the main raw materials, and coal tar as a binder. They are made through a series of processes such as raw material preparation, batching, mixing, molding, roasting, and machining. Carbon blocks have good high temperature resistance and corrosion resistance, as well as certain electrical conductivity and thermal conductivity.

[0003] After slicing, the carbon blocks for slicing are assembled into carriers for high-temperature calcination of negative electrode materials. Their conductivity, oxidation resistance, internal structure and other indicators are superior to those of conventional anode carbon blocks.

[0004] The traditional carbon block for slicing has a high resistivity (about 57µΩ·m) due to the limitation of the ingredients and production process, and consumes more power during the high-temperature calcination of the negative electrode material. Therefore, the present invention provides a carbon block for slicing and a forming method thereof. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention provides a carbon block for slicing and a forming method thereof, which solves the problem that the traditional carbon block for slicing has a high resistivity (about 57µΩ·m) due to the limitations of the ingredient composition and production process, and consumes more power during the high-temperature calcination process of the negative electrode material.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0007] A carbon block for slicing, comprising the following components by weight:

[0008] 5-15 parts of the first coke material, 18-28 parts of the second coke material, 26-28 parts of the third coke material, 9-19 parts of the fourth coke material, 21-31 parts of the fifth coke material, 15-16 parts of asphalt, and 1.5-2.5 parts of modified powder;

[0009] The first coke material has a particle size of 3-10 mm and a tap density of 0.80-0.85 g / cm 3 of coke;

[0010] The second coke material has a particle size of 0-3 mm and a tap density of 0.80-0.85 g / cm 3 of coke;

[0011] The third coke material is: coke powder with a particle size less than 200 mesh;

[0012] The fourth coke material has a particle size of 3-10 mm and a tap density of 0.88-0.92 g / cm 3 of coke;

[0013] The fifth coke material has a particle size of 0-3 mm and a tap density of 0.88-0.92 g / cm 3 of coke;

[0014] The modified powder is graphite powder.

[0015] Preferably, it also includes: 3-4 parts by weight of raw crushed material, wherein the raw crushed material is obtained by crushing waste material generated in the process of preparing carbon blocks for slicing.

[0016] Preferably, the purity of the third coke material at 70-80 μm is 72% to 80%.

[0017] Another object of the present invention is to provide a method for forming a carbon block for slicing, which uses the above-mentioned carbon block components for slicing to prepare a carbon block for slicing, and specifically comprises the following steps:

[0018] S1: weigh the ingredients;

[0019] S2: mixing the first coke material, the second coke material, the third coke material, the fourth coke material and the fifth coke material to obtain a paste, preheating the paste, then adding the preheated asphalt to mix, knead, cool and shape to obtain a green block, and adding the modified powder during the shaping process;

[0020] S3: calcining the green block to form a carbon block for slicing;

[0021] During the roasting process, the final temperature of the fire channel is controlled to be 1140-1160°C.

[0022] Preferably, the resistivity of the carbon block for slicing is lower than 50 µΩ·m.

[0023] Preferably, the bulk density of the green block is greater than or equal to 1.64 g / cm 3 .

[0024] Preferably, the molding process adopts natural exhaust vibration molding.

[0025] Preferably, the first coke material, the second coke material, and the third coke material are all obtained by crushing and screening calcined coke produced by a rotary furnace process, and 22%-35% low-emission petroleum coke is added during the production of calcined coke by the rotary furnace process;

[0026] The fourth coke material and the fifth coke material are both obtained by crushing and screening the calcined coke produced by the pot furnace process.

[0027] Preferably, the sulfur content in the paste is not more than 2.55%.

[0028] Preferably, the paste preheating temperature is 182-188°C, the asphalt preheating temperature is 180-186°C, and the temperature of the molding process is the asphalt softening point temperature plus 40°C.

[0029] The present invention provides a carbon block for slicing and a forming method thereof. It has the following beneficial effects:

[0030] 1. The present invention adds graphite powder modification powder during the carbon block forming process and adjusts the roasting process to increase the final temperature of the fire channel (the final temperature of the fire channel is controlled to be 1140-1160°C during the roasting process), so that the resistivity of the carbon block for slicing is as low as 50µΩ·m, and the conductive heating process is more energy-saving.

[0031] 2. The present invention adopts natural exhaust vibration molding in the molding process, which greatly reduces the difficulty of the stress release process, reduces the generation of internal cracks, and ensures the uniformity and integrity of the product.

[0032] 3. The present invention reasonably controls the particle size and tap density of the raw materials so that the bulk density of the green blocks obtained is greater than or equal to 1.64 g / cm 3 The obtained product has moderate density, which further reduces the occurrence of internal cracks and ensures the uniformity and integrity of the product. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present invention will be described clearly and completely below in combination with the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] Embodiment 1:

[0035] The embodiment of the present invention provides a carbon block for slicing, which comprises the following components by weight:

[0036] 5 parts of the first coke material, 18 parts of the second coke material, 26 parts of the third coke material, 9 parts of the fourth coke material, 21 parts of the fifth coke material, 15 parts of asphalt, and 1.5 parts of modified powder;

[0037] The first coke material has a particle size of 3-10 mm and a tap density of 0.80-0.85 g / cm 3 of coke;

[0038] The second coke material has a particle size of 0-3 mm and a tap density of 0.80-0.85 g / cm 3 of coke;

[0039] The third coke material is: coke powder with a particle size less than 200 mesh;

[0040] The fourth coke material has a particle size of 3-10 mm and a tap density of 0.88-0.92 g / cm 3 of coke;

[0041] The fifth coke material has a particle size of 0-3 mm and a tap density of 0.88-0.92 g / cm 3 of coke;

[0042] The modified powder is graphite powder.

[0043] 3-4 parts by weight of raw crushed material can also be appropriately added to the above components. The raw crushed material is obtained by crushing the waste material generated in the process of preparing carbon blocks for slicing. The components in the raw crushed material are the same as those in the raw material without raw crushed material. Therefore, adding a small amount of raw crushed material will not affect the data and can reasonably utilize the waste material. The purity of the third coke material at 70-80μm is 72% to 80%.

[0044] Embodiment 2:

[0045] The embodiment of the present invention provides a carbon block for slicing, which comprises the following components by weight:

[0046] 15 parts of the first coke material, 28 parts of the second coke material, 28 parts of the third coke material, 19 parts of the fourth coke material, 31 parts of the fifth coke material, 16 parts of asphalt, and 2.5 parts of modified powder;

[0047] The first coke material has a particle size of 3-10 mm and a tap density of 0.80-0.85 g / cm 3 of coke;

[0048] The second coke material has a particle size of 0-3 mm and a tap density of 0.80-0.85 g / cm 3 of coke;

[0049] The third coke material is: coke powder with a particle size less than 200 mesh;

[0050] The fourth coke material has a particle size of 3-10 mm and a tap density of 0.88-0.92 g / cm 3 of coke;

[0051] The fifth coke material has a particle size of 0-3 mm and a tap density of 0.88-0.92 g / cm 3 of coke;

[0052] The modified powder is graphite powder.

[0053] You can also add 3-4 parts by weight of raw crushed material to the above components. The raw crushed material is obtained by crushing the waste generated in the process of preparing carbon blocks for slicing. The components in the raw crushed material are the same as those in the raw material without raw crushed material. Therefore, adding a small amount of raw crushed material will not affect the data and can make rational use of the waste material. The purity of the third coke material at 70-80μm is 72-80%.

[0054] Embodiment three:

[0055] The embodiment of the present invention provides a carbon block for slicing, which comprises the following components by weight:

[0056] 10 parts of the first coke material, 23 parts of the second coke material, 27 parts of the third coke material, 14 parts of the fourth coke material, 26 parts of the fifth coke material, 15.3 parts of asphalt, and 2 parts of modified powder.

[0057] The first coke material has a particle size of 3-10 mm and a tap density of 0.80-0.85 g / cm 3 of coke;

[0058] The second coke material has a particle size of 0-3 mm and a tap density of 0.80-0.85 g / cm 3 of coke;

[0059] The third coke material is: coke powder with a particle size less than 200 mesh;

[0060] The fourth coke material has a particle size of 3-10 mm and a tap density of 0.88-0.92 g / cm 3 of coke;

[0061] The fifth coke material has a particle size of 0-3 mm and a tap density of 0.88-0.92 g / cm 3 of coke;

[0062] The modified powder is graphite powder.

[0063] You can also add 3-4 parts by weight of raw crushed material to the above components. The raw crushed material is obtained by crushing the waste generated in the process of preparing carbon blocks for slicing. The components in the raw crushed material are the same as those in the raw material without raw crushed material. Therefore, adding a small amount of raw crushed material will not affect the data and can make rational use of the waste material. The purity of the third coke material at 70-80μm is 72-80%.

[0064] Embodiment 4:

[0065] A method for forming a carbon block for slicing, specifically comprising the following steps:

[0066] S1: weigh the ingredients;

[0067] S2: The first coke material, the second coke material, the third coke material, the fourth coke material and the fifth coke material are mixed to obtain a paste, wherein the sulfur content in the paste is not more than 2.55%, the paste is preheated at a temperature of 182-188°C, and then the preheated asphalt is added for kneading, cooling and molding to obtain a green block, and modified powder is added during the molding process, the asphalt preheating temperature is 180-186°C, and the molding process temperature is the asphalt softening point temperature plus 40°C;

[0068] S3: calcining the green block to form a carbon block for slicing; during the calcining process, the final temperature of the fire channel is controlled to be 1140-1160°C, preferably 1150°C; the resistivity of the carbon block for slicing is less than 50µΩ·m; the volume density of the green block is greater than or equal to 1.64g / cm 3 The molding process adopts natural exhaust vibration molding, which greatly reduces the difficulty of the stress release process, reduces the generation of internal cracks, and ensures the uniformity and integrity of the product.

[0069] The first coke material, the second coke material and the third coke material are all obtained by crushing and screening the calcined coke produced by the rotary furnace process, and 22%-35% low-emission petroleum coke is added in the process of producing the calcined coke by the rotary furnace process; and the fourth coke material and the fifth coke material are all obtained by crushing and screening the calcined coke produced by the pot furnace process.

[0070] The carbon blocks for slicing were manufactured using the components of the carbon blocks for slicing in Example 1, Example 2, and Example 3 respectively, and according to the forming method of the carbon blocks for slicing in Example 4. The carbon blocks for slicing were tested to obtain the following data:

[0071] Data one source: the components of the carbon block for slicing in Example 1 and the molding method of the carbon block for slicing in Example 4 to manufacture the carbon block for slicing; Data two source: the components of the carbon block for slicing in Example 2 and the molding method of the carbon block for slicing in Example 4 to manufacture the carbon block for slicing; Data three source: the components of the carbon block for slicing in Example 3 and the molding method of the carbon block for slicing in Example 4 to manufacture the carbon block for slicing.

[0072] Table 1: data Resistivity (µΩ·m) Defective rate (%) Data 1 48.6 2 Data 2 47.2 2.2 Data 3 48.5 1.8

[0073] From the data in Table 1, it can be seen that the carbon blocks for slicing manufactured by the above process have low resistivity, good product uniformity and integrity, and low scrap rate.

[0074] In the process of producing calcined coke by rotary furnace technology, by reasonably controlling the amount of low-emission petroleum coke added, adding 22%-35% low-emission petroleum coke, it can ensure that the sulfur content and vanadium content are reduced.

[0075] Table 2:

[0076] From the data in Table 2, it can be seen that by reasonably controlling the amount of low-emission petroleum coke added, the sulfur content and vanadium content in each link can be guaranteed to meet the requirements.

[0077] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A carbon block for slicing, characterized in that: The components include the following by weight: 5-15 parts of the first coke material, 18-28 parts of the second coke material, 26-28 parts of the third coke material, 9-19 parts of the fourth coke material, 21-31 parts of the fifth coke material, 15-16 parts of asphalt, and 1.5-2.5 parts of modified powder; The first coke material has a particle size of 3-10 mm and a tap density of 0.80-0.85 g / cm 3 of coke; The second coke material has a particle size of 0-3 mm and a tap density of 0.80-0.85 g / cm 3 of coke; The third coke material is: coke powder with a particle size less than 200 mesh; The fourth coke material has a particle size of 3-10 mm and a tap density of 0.88-0.92 g / cm 3 of coke; The fifth coke material has a particle size of 0-3 mm and a tap density of 0.88-0.92 g / cm 3 of coke; The modified powder is graphite powder.

2. A carbon block for slicing according to claim 1, characterized in that: Also includes: 3-4 parts by weight of raw crushed material, wherein the raw crushed material is obtained by crushing the waste material generated in the process of preparing carbon blocks for slicing.

3. The carbon block for slicing according to claim 1, characterized in that: The purity of the third coke material at 70-80 μm is 72% to 80%.

4. A method for forming a carbon block for slicing, characterized in that: The carbon block for slicing is prepared by using the carbon block component for slicing according to any one of claims 1 to 3, which specifically comprises the following steps: S1: weigh the ingredients; S2: mixing the first coke material, the second coke material, the third coke material, the fourth coke material and the fifth coke material to obtain a paste, preheating the paste, then adding the preheated asphalt to mix, knead, cool and shape to obtain a green block, and adding the modified powder during the shaping process; S3: calcining the green block to form a carbon block for slicing; During the roasting process, the final temperature of the fire channel is controlled to be 1140-1160°C.

5. The method for forming a carbon block for slicing according to claim 4, characterized in that: The resistivity of the carbon block for slicing is lower than 50 µΩ·m.

6. The method for forming a carbon block for slicing according to claim 4, characterized in that: The bulk density of the green block is greater than or equal to 1.64 g / cm 3 .

7. The method for forming a carbon block for slicing according to claim 4, characterized in that: The molding process adopts natural exhaust vibration molding.

8. The method for forming a carbon block for slicing according to claim 4, characterized in that: The first coke material, the second coke material and the third coke material are all obtained by crushing and screening the calcined coke produced by the rotary furnace process, and 22%-35% low-emission petroleum coke is added to the calcined coke produced by the rotary furnace process; The fourth coke material and the fifth coke material are both obtained by crushing and screening the calcined coke produced by the pot furnace process.

9. The method for forming a carbon block for slicing according to claim 8, characterized in that: The sulfur content in the paste is not more than 2.55%.

10. The method for forming a carbon block for slicing according to claim 4, characterized in that: The paste preheating temperature is 182-188°C, the asphalt preheating temperature is 180-186°C, and the temperature of the molding process is the asphalt softening point temperature plus 40°C.

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