CN116145195A - Method for improving quality homogeneity of carbon anode green body for aluminum - Google Patents
Method for improving quality homogeneity of carbon anode green body for aluminum Download PDFInfo
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- CN116145195A CN116145195A CN202310016870.7A CN202310016870A CN116145195A CN 116145195 A CN116145195 A CN 116145195A CN 202310016870 A CN202310016870 A CN 202310016870A CN 116145195 A CN116145195 A CN 116145195A
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- petroleum coke
- coal tar
- tar pitch
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/08—Producing shaped prefabricated articles from the material by vibrating or jolting
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
- C04B35/52—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbon, e.g. graphite
- C04B35/528—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbon, e.g. graphite obtained from carbonaceous particles with or without other non-organic components
- C04B35/532—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbon, e.g. graphite obtained from carbonaceous particles with or without other non-organic components containing a carbonisable binder
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
- C25C3/00—Electrolytic production, recovery or refining of metals by electrolysis of melts
- C25C3/06—Electrolytic production, recovery or refining of metals by electrolysis of melts of aluminium
- C25C3/08—Cell construction, e.g. bottoms, walls, cathodes
- C25C3/12—Anodes
- C25C3/125—Anodes based on carbon
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
- C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
- C04B2235/6562—Heating rate
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention discloses a method for improving the quality homogeneity of a carbon anode green body for aluminum, which belongs to the technical field of preparation of carbon anodes for aluminum and comprises the following steps: s1: screening the petroleum coke, screening out the larger-size petroleum coke, reserving smaller-size powder, and crushing the larger-size petroleum coke raw material; s2: mixing the crushed petroleum coke and the coal tar pitch binder, and granulating the mixed petroleum coke and coal tar pitch raw materials by a granulator; s3: drying the granulated petroleum coke and coal tar pitch particles, and grinding into powder through grinding equipment; s4: and (3) repeating the step (S2) to add a coal tar pitch bonding agent into the petroleum coke and coal tar pitch mixed powder which are ground into powder for mixing, and granulating the mixed petroleum coke and coal tar pitch mixed powder mixture. The preparation method can carry out pelletization and grinding on petroleum coke and coal tar pitch for a plurality of times, and improves the homogeneity of the carbon anode green compact by controlling the rising rate of vibration force during vibration molding.
Description
Technical Field
The invention relates to the technical field of preparation of carbon anodes for aluminum, in particular to a method for improving quality homogeneity of green bodies of carbon anodes for aluminum.
Background
In the aluminum electrolysis cell, a carbon anode is a core component and is used for being connected with an anode in the electrolysis cell, the main components of the carbon anode are petroleum coke and coal tar pitch, self baking or prebaking is needed in the preparation process of the carbon anode, processes such as crushing, proportioning, kneading and the like are needed before baking, assembly is carried out after molding and baking, and defects exist in the production process of a green body of the carbon anode for aluminum;
in the existing preparation process of the carbon anode green compact, the petroleum coke and coal tar pitch raw materials are mixed for a single time and then granulated and milled, and although the mixing function can be realized, the quality homogeneity of the carbon anode green compact cannot be ensured, and the existing preparation method of the carbon anode green compact cannot limit the lifting rate of vibration force during vibration molding, so that the homogeneity of the quality of the carbon anode green compact can be influenced due to overlarge lifting of the braking rate.
Thus, we have made improvements to this and have proposed a method of improving the homogeneity of the green mass of carbon anodes for aluminium.
Disclosure of Invention
The present invention has been made in view of the problems existing in the existing carbon anode green body.
In order to solve the technical problems, according to one aspect of the present invention, the following technical solutions are provided: a method for improving the quality homogeneity of a carbon anode green body for aluminum, comprising the steps of:
s1: screening the petroleum coke, screening out the larger-size petroleum coke, reserving smaller-size powder, and crushing the larger-size petroleum coke raw material;
s2: mixing the crushed petroleum coke and the coal tar pitch binder, and granulating the mixed petroleum coke and coal tar pitch raw materials by a granulator;
s3: drying the granulated petroleum coke and coal tar pitch particles, and grinding into powder by grinding equipment;
s4: repeating the step S2, adding a coal tar pitch bonding agent into the petroleum coke and coal tar pitch mixed powder which are ground into powder for mixing, and granulating the mixed petroleum coke and coal tar pitch mixed powder mixture to form petroleum coke and coal tar pitch mixed powder mixture particles;
s5: calcining the petroleum coke and coal tar pitch mixed powder mixture particles in the step S4 by a calciner;
s6: pouring the calcined petroleum coke and coal pitch mixed powder mixture particles into a vibration molding device for vibration to mold a carbon anode green body;
s7: and roasting the carbon anode green body formed by vibration.
As a preferred embodiment of the method for improving the quality homogeneity of a carbon anode green body for aluminum according to the present invention, wherein: in the step S1, the granularity of crushed petroleum coke particles is less than or equal to 1mm.
As a preferred embodiment of the method for improving the quality homogeneity of a carbon anode green body for aluminum according to the present invention, wherein: in the step S2, the granularity of the granulated petroleum coke and coal tar pitch raw materials is less than or equal to 5mm.
As a preferred embodiment of the method for improving the quality homogeneity of a carbon anode green body for aluminum according to the present invention, wherein: in the step S3, the granularity of the petroleum coke and coal tar pitch particles after grinding is 5-10 mu m.
As a preferred embodiment of the method for improving the quality homogeneity of a carbon anode green body for aluminum according to the present invention, wherein: in the step S4, the step S2 is repeated for 3-5 times, the particle size of the petroleum coke and coal tar pitch mixed powder mixture is smaller than 2mm, the proportion of the total amount of the petroleum coke and the coal tar pitch added in the step S2 is kept the same, and meanwhile, in the process of granulating for a plurality of times, the particle size of the particles after granulating each time is decreased, and the kneading time is increased.
As a preferred embodiment of the method for improving the quality homogeneity of a carbon anode green body for aluminum according to the present invention, wherein: in the step S5, the calcination temperature is 1200-1240 ℃.
As a preferred embodiment of the method for improving the quality homogeneity of a carbon anode green body for aluminum according to the present invention, wherein: in the step S6, the vibration frequency of vibration molding is 28-33Hz, and the vibration force is 400-600KN.
As a preferred embodiment of the method for improving the quality homogeneity of a carbon anode green body for aluminum according to the present invention, wherein: the lifting rate of the vibrating force is 30-50KN/s.
As a preferred embodiment of the method for improving the quality homogeneity of a carbon anode green body for aluminum according to the present invention, wherein: in the step S7, the initial temperature is 600 ℃, the heating rate is 8-10 ℃/h, and the final roasting temperature is 1150-1200 ℃.
Compared with the prior art, the invention has the beneficial effects that:
1. the preparation method comprises the steps of repeatedly grinding and granulating petroleum coke and coal tar pitch raw materials, gradually reducing the granularity in the granulating process, ensuring better mixing and homogenizing effects after grinding and granulating, and ensuring the homogeneity of the carbon anode green body.
2. According to the preparation method of the carbon anode, in the process of preparing the green carbon anode, after the micro powder is poured into a vibration forming machine, the vibration force is gradually increased, so that the force for ensuring that particles mutually collide is gradually increased, the compactness of the green carbon anode is improved while the homogeneity is ensured, the production quality of the green carbon anode is further improved, and the defect that the homogeneity of the green carbon anode prepared by the existing preparation method of the carbon anode is poor is overcome.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following detailed description will be given with reference to the accompanying drawings and detailed embodiments, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained from these drawings without inventive effort to a person of ordinary skill in the art.
Wherein:
FIG. 1 is a flow chart of a method of improving the quality homogeneity of a carbon anode green body for aluminum in accordance with the present invention.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present invention is not limited to the specific embodiments disclosed below.
Examples
The following detailed description of specific embodiments of the invention is provided in connection with the accompanying drawings and examples. The following examples are only illustrative of the present invention and are not intended to limit the scope of the invention.
Example 1:
the embodiment provides a method for improving the quality homogeneity of a carbon anode green body for aluminum, which comprises the following steps:
s1: screening the petroleum coke, screening out the larger-sized petroleum coke, reserving smaller-sized powder, crushing the larger-sized petroleum coke raw material, and enabling the granularity of crushed petroleum coke particles to be 1mm;
s2: mixing the crushed petroleum coke and the coal tar pitch binder, and granulating the mixed petroleum coke and coal tar pitch raw materials by a granulator, wherein the granularity of the granulated petroleum coke and coal tar pitch raw materials is 5mm;
s3: drying the granulated petroleum coke and coal tar pitch particles, and grinding the petroleum coke and coal tar pitch particles into powder by grinding equipment, wherein the granularity of the petroleum coke and coal tar pitch particles is 10 mu m;
s4: repeating the step S2, adding a coal tar pitch binder into the ground petroleum coke and coal tar pitch mixed powder for mixing, granulating the mixed petroleum coke and coal tar pitch mixed powder mixture to form petroleum coke and coal tar pitch mixed powder mixture particles, and repeating the step S2 for 5 times, wherein the particle size of the petroleum coke and coal tar pitch mixed powder mixture is 1.5mm;
s5: calcining the petroleum coke and coal tar pitch mixed powder mixture particles in the step S4 by a calciner, wherein the calcining temperature is 1240 ℃;
s6: pouring the calcined petroleum coke and coal tar pitch mixed powder mixture particles into a vibration molding device for vibration to mold a carbon anode green body, wherein the vibration frequency of the vibration molding is 33Hz, the vibration force is 400-600KN, and the lifting rate of the vibration force is 50KN/s;
s7: and roasting the carbon anode green body formed by vibration, wherein the initial temperature is 600 ℃, the heating rate is 10 ℃/h, and the final roasting temperature is 1200 ℃.
Example 2:
the scheme of example 1 is further described in conjunction with the specific operation described below:
specifically, the method for improving the quality homogeneity of the carbon anode green body for aluminum comprises the following steps:
s1: screening the petroleum coke, screening out the larger-sized petroleum coke, reserving smaller-sized powder, crushing the larger-sized petroleum coke raw material, and enabling the granularity of crushed petroleum coke particles to be 0.5mm;
s2: mixing the crushed petroleum coke and the coal tar pitch binder, and granulating the mixed petroleum coke and coal tar pitch raw materials by a granulator, wherein the granularity of the granulated petroleum coke and coal tar pitch raw materials is 3mm;
s3: drying the granulated petroleum coke and coal tar pitch particles, and grinding the petroleum coke and coal tar pitch particles into powder by grinding equipment, wherein the granularity of the petroleum coke and coal tar pitch particles is 5 mu m;
s4: repeating the step S2, adding a coal tar pitch binder into the ground petroleum coke and coal tar pitch mixed powder for mixing, granulating the mixed petroleum coke and coal tar pitch mixed powder mixture to form petroleum coke and coal tar pitch mixed powder mixture particles, and repeating the step S2 for 3 times, wherein the particle size of the petroleum coke and coal tar pitch mixed powder mixture is 1mm;
s5: calcining the petroleum coke and coal tar pitch mixed powder mixture particles in the step S4 by a calciner, wherein the calcining temperature is 1200 ℃;
s6: pouring the calcined petroleum coke and coal tar pitch mixed powder mixture particles into a vibration molding device for vibration to mold a carbon anode green body, wherein the vibration frequency of the vibration molding is 28Hz, the vibration force is 400KN, and the lifting rate of the vibration force is 30KN/s;
s7: and roasting the carbon anode green body formed by vibration, wherein the initial temperature is 600 ℃, the heating rate is 8 ℃/h, and the final roasting temperature is 1150 ℃.
It should be noted that, the ratio of the total amount of petroleum coke and coal pitch added when repeating step S2 in examples 1 and 2 remains the same, and in the process of granulating for multiple times, it is necessary to ensure that the particle size of the granulated material after each granulation decreases, and the kneading time after each granulation increases, so as to maximize the homogeneity of the carbon anode green compact.
The above embodiments are only for illustrating the present invention, and are not limiting of the present invention. While the invention has been described in detail with reference to the embodiments, those skilled in the art will appreciate that various combinations, modifications, and substitutions can be made thereto without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (9)
1. A method for improving the quality homogeneity of a carbon anode green body for aluminum, comprising the steps of:
s1: screening the petroleum coke, screening out the larger-size petroleum coke, reserving smaller-size powder, and crushing the larger-size petroleum coke raw material;
s2: mixing the crushed petroleum coke and the coal tar pitch binder, and granulating the mixed petroleum coke and coal tar pitch raw materials by a granulator;
s3: drying the granulated petroleum coke and coal tar pitch particles, and grinding into powder by grinding equipment;
s4: repeating the step S2, adding a coal tar pitch bonding agent into the petroleum coke and coal tar pitch mixed powder which are ground into powder for mixing, and granulating the mixed petroleum coke and coal tar pitch mixed powder mixture to form petroleum coke and coal tar pitch mixed powder mixture particles;
s5: calcining the petroleum coke and coal tar pitch mixed powder mixture particles in the step S4 by a calciner;
s6: pouring the calcined petroleum coke and coal pitch mixed powder mixture particles into a vibration molding device for vibration to mold a carbon anode green body;
s7: and roasting the carbon anode green body formed by vibration.
2. The method for improving the quality homogeneity of a carbon anode green body for aluminum according to claim 1, wherein in S1, the particle size of crushed petroleum coke particles is less than or equal to 1mm.
3. The method for improving the quality homogeneity of the carbon anode green body for aluminum according to claim 2, wherein in the step S2, the granularity of the granulated petroleum coke and coal tar pitch raw materials is less than or equal to 5mm.
4. The method for improving the quality homogeneity of a carbon anode green body for aluminum according to claim 1, wherein in S3, the particle size of petroleum coke and coal pitch particles after grinding is 5-10 μm.
5. The method for improving the quality homogeneity of the carbon anode green body for aluminum according to claim 1, wherein in the step S4, the step S2 is repeated 3 to 5 times, the particle size of the petroleum coke and coal pitch mixed powder mixture is smaller than 2mm, the proportion of the total amount of the petroleum coke and the coal pitch added in the step S2 is kept the same, and in the process of granulating for a plurality of times, the particle size of the particles after each granulating is decreased, and the kneading time is increased.
6. The method for improving the quality homogeneity of a carbon anode green body for aluminum according to claim 1, wherein in S5, the calcination temperature is 1200 to 1240 ℃.
7. The method for improving the quality homogeneity of a carbon anode green body for aluminum according to claim 1, wherein in S6, the vibration frequency of the vibration molding is 28-33Hz, and the vibration force is 400-600KN.
8. The method of claim 7, wherein the rate of increase of the vibratory force is between 30 and 50KN/s.
9. The method for improving the quality homogeneity of a carbon anode green body for aluminum according to claim 1, wherein in S7, the initial temperature is 600 ℃, the heating rate is 8-10 ℃/h, and the final baking temperature is 1150-1200 ℃.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310016870.7A CN116145195A (en) | 2023-01-06 | 2023-01-06 | Method for improving quality homogeneity of carbon anode green body for aluminum |
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| CN202310016870.7A CN116145195A (en) | 2023-01-06 | 2023-01-06 | Method for improving quality homogeneity of carbon anode green body for aluminum |
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| CN116145195A true CN116145195A (en) | 2023-05-23 |
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| CN202310016870.7A Pending CN116145195A (en) | 2023-01-06 | 2023-01-06 | Method for improving quality homogeneity of carbon anode green body for aluminum |
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- 2023-01-06 CN CN202310016870.7A patent/CN116145195A/en active Pending
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