CN114457383A - Cathode tamping paste for environment-friendly aluminum electrolysis cell - Google Patents
Cathode tamping paste for environment-friendly aluminum electrolysis cell Download PDFInfo
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- CN114457383A CN114457383A CN202210187572.XA CN202210187572A CN114457383A CN 114457383 A CN114457383 A CN 114457383A CN 202210187572 A CN202210187572 A CN 202210187572A CN 114457383 A CN114457383 A CN 114457383A
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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
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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
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/28—Polysaccharides or derivatives thereof
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/30—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values
- C04B2201/32—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values for the thermal conductivity, e.g. K-factors
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Metallurgy (AREA)
- Structural Engineering (AREA)
- Electrolytic Production Of Metals (AREA)
Abstract
The invention relates to an environment-friendly cathode tamping paste for an aluminum electrolysis cell, belongs to the technical field of aluminum electrolysis, and solves the technical problems of environmental pollution, harm to the mind and body of operators and the like caused by the overflow of harmful benzopyrene in the traditional binder. The solution is as follows: the cathode tamping paste for the environment-friendly aluminum electrolytic cell comprises the following components in parts by weight: 55-65 parts of aggregate, 35-45 parts of powder and 12-20 parts of binder; the aggregate comprises electrically calcined coal aggregate, and the granularity of the electrically calcined coal aggregate is less than or equal to 10 mm; the powder comprises electric calcined coal powder, artificial stone milled powder and cooked crushed powder, wherein the purity of the electric calcined coal powder is 50-55%, the purity of the artificial stone milled powder is 30-35%, and the purity of the cooked crushed powder is 55-60%; the adhesive comprises rosin and dextrin, wherein the rosin accounts for 55-65% of the total amount of the adhesive. The invention has no overflow of harmful ingredients of benzopyrene in the building and using processes of the aluminum electrolytic cell, is green and environment-friendly, and improves the performance of the tamping paste.
Description
Technical Field
The invention belongs to the technical field of aluminum electrolysis, and particularly relates to an environment-friendly cathode tamping paste for an aluminum electrolysis cell.
Background
At present, the global aluminum yield and consumption are increased by 4-5%, and China is one of the world's largest aluminum producing countries.
In the process of building and overhauling the aluminum cell, a large amount of cathode bottom blocks, side blocks and a corresponding matched cathode paste are needed for building, the cathode tamping paste is an important component in the cathode material of the aluminum cell, is mainly used as a bonding material between the carbon blocks at the bottom of the aluminum cell, between the carbon blocks at the side parts and between the carbon blocks at the bottom and the steel bar, and the using amount of the cathode tamping paste accounts for about 25 percent of the total amount of all cathode materials in the building and tamping process of the aluminum cell, which is equivalent to 25 percent of the bottom area of the whole aluminum cell, so the product quality and the construction quality of the aluminum cell are of great importance to the running state and the service life of the aluminum cell.
The currently produced cathode tamping paste is mainly a series of hot tamping pastes with construction temperature of about 110 ℃, warm tamping pastes with construction temperature of about 55 ℃ and series of cold tamping pastes with construction temperature of 20-30 ℃ aiming at high-graphite cathode carbon blocks with artificial graphite content of about 30-50%. The characteristics of the products are as follows: in the production process, asphalt is used as a main binder for mixing and kneading, so that during the building and starting processes of the aluminum electrolytic cell, benzopyrene which is a harmful component in the binder overflows, and the overflowing amount of benzopyrene accounts for 2.5-3.5% of the using amount of the binder under normal conditions, so that the production environment is polluted, the mind and body of an operator are harmed, and green and environment-friendly production is not facilitated. Therefore, a novel environment-friendly paste which is environment-friendly, does not harm the production environment and operators and contains no benzopyrene in the binder is urgently needed to be developed.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides the cathode tamping paste for the environment-friendly aluminum electrolytic cell, and solves the technical problems of environmental pollution, harm to the body and mind of operators and the like caused by the overflow of harmful benzopyrene in the traditional binder.
In order to solve the problems, the technical scheme of the invention is as follows: an environment-friendly cathode tamping paste for an aluminum electrolysis cell, wherein: the paint comprises the following components in parts by weight: 55-65 parts of aggregate, 35-45 parts of powder and 12-20 parts of binder;
the aggregate comprises electrically calcined coal aggregate, and the granularity of the electrically calcined coal aggregate is less than or equal to 10 mm;
the powder comprises electric calcined coal powder, artificial stone milled powder and cooked crushed powder, wherein the purity of the electric calcined coal powder is 50-55%, the purity of the artificial stone milled powder is 30-35%, and the purity of the cooked crushed powder is 55-60%;
the adhesive comprises rosin and dextrin, wherein the rosin accounts for 55-65% of the total amount of the adhesive.
Further, the paint comprises the following components in parts by weight: 60 parts by weight of aggregate, 40 parts by weight of powder and 16 parts by weight of binder.
Further, the rosin in the binder accounts for 60% of the total amount of the binder.
Further, the binder is obtained by adding 60-70 ℃ water into the dextrin, uniformly stirring the dextrin and the rosin, and uniformly mixing the dextrin and the rosin.
Compared with the prior art, the invention has the beneficial effects that:
the invention has no overflow of harmful ingredients of benzopyrene in the building and using processes of the aluminum electrolytic cell, the binder is green and environment-friendly, the invention overcomes the defect of unstable softening point of the traditional liquid asphalt, and also eliminates the defect of poor infiltration effect of solid asphalt, so that the plasticity of the paste material reaches the best during kneading, the performance of the ramming paste is improved, and the service life of the electrolytic cell is further prolonged.
Detailed Description
The present invention will be described in further detail with reference to examples.
Example one
An environment-friendly cathode tamping paste for an aluminum electrolysis cell, wherein: the paint comprises the following components in parts by weight: 55-65 parts of aggregate, 35-45 parts of powder and 12-20 parts of binder;
the aggregate comprises electrically calcined coal aggregate, and the granularity of the electrically calcined coal aggregate is less than or equal to 10 mm;
the powder comprises electric calcined coal powder, artificial stone milled powder and cooked crushed powder, wherein the purity of the electric calcined coal powder is 50%, the purity of the artificial stone milled powder is 30%, and the purity of the cooked crushed powder is 55%;
the adhesive comprises rosin and dextrin, wherein the rosin accounts for 55-65% of the total amount of the adhesive.
Further, the binder is obtained by adding 60-70 ℃ water into the dextrin, uniformly stirring the dextrin and the rosin, and uniformly mixing the dextrin and the rosin.
The test results of the tamping paste performance indexes are as follows:
example two
An environment-friendly cathode tamping paste for an aluminum electrolysis cell, wherein: the paint comprises the following components in parts by weight: 55-65 parts of aggregate, 35-45 parts of powder and 12-20 parts of binder;
the aggregate comprises electrically calcined coal aggregate, and the granularity of the electrically calcined coal aggregate is less than or equal to 10 mm;
the powder comprises electric calcined coal powder, artificial stone milled powder and cooked crushed powder, wherein the purity of the electric calcined coal powder is 53%, the purity of the artificial stone milled powder is 62%, and the purity of the cooked crushed powder is 58%;
the adhesive comprises rosin and dextrin, wherein the rosin accounts for 55-65% of the total amount of the adhesive.
Further, the binder is obtained by adding 60-70 ℃ water into the dextrin, uniformly stirring the dextrin and the rosin, and uniformly mixing the dextrin and the rosin.
The test results of the tamping paste performance indexes are as follows:
EXAMPLE III
An environment-friendly cathode tamping paste for an aluminum electrolysis cell, wherein: the paint comprises the following components in parts by weight: 55-65 parts of aggregate, 35-45 parts of powder and 12-20 parts of binder;
the aggregate comprises electrically calcined coal aggregate, and the granularity of the electrically calcined coal aggregate is less than or equal to 10 mm;
the powder comprises electric calcined coal powder, artificial stone milled powder and cooked crushed powder, wherein the purity of the electric calcined coal powder is 55%, the purity of the artificial stone milled powder is 35%, and the purity of the cooked crushed powder is 60%;
the adhesive comprises rosin and dextrin, wherein the rosin accounts for 55-65% of the total amount of the adhesive.
Further, the binder is obtained by adding 60-70 ℃ water into the dextrin, uniformly stirring the dextrin and the rosin, and uniformly mixing the dextrin and the rosin.
The test results of the tamping paste performance indexes are as follows:
the quality of the cathode tamping paste is greatly influenced by the properties of the raw materials, different raw materials have different characteristics, and the quality characteristics of the produced products also have obvious differences. Therefore, in order to improve the quality of the cathode base paste, the properties and the types of the used raw materials need to be researched, selected and determined according to the quality characteristic requirements of products, the physical and chemical characteristics of different raw materials are analyzed, compared and researched, the physical and chemical properties such as ash, sulfur, graphitization degree and the like are respectively tested, and the raw materials of various production places are tested for mechanical strength on a rotary drum testing machine and a Hardgrove grindability index tester so as to detect and compare the crushing strength and the abrasion resistance index between the raw materials and select the optimal raw material.
The property and the use ratio of the binder greatly influence the plasticity of the paste and directly influence various physical and chemical indexes of the tamping paste. The two factors were subjected to an orthogonal test with a binder ratio of 1 percentage point for each increase and a kneading temperature of 2 ℃ for each increase. And respectively observing and comparing the plasticity condition of the paste, the appearance quality of the product and various physical and chemical performance conditions under different kneading temperatures and proportioning conditions. In particular, the indexes of volatile matter, volume density, tamping degree, expansion rate, shrinkage rate and the like of the paste are analyzed, researched and compared.
The viscosity of the binder is within a range of 850 to 900mPa.s, wherein the measurement temperature of the viscosity is 50 ℃.
A bonding test is carried out under the existing mixing kneading and roasting conditions, the mixing kneading temperature in the mixing kneading process is 45-50 ℃, after roasting and sintering, the apparent density is reduced by about 11%, and the ash content is increased by about 20%.
The industrial production test process is as follows:
1) according to the formula and the technological parameters determined by the laboratory test results, 5-10 times of industrial production tests are carried out on various different kinds of pastes in the existing process. And the results of each test are analyzed and compared according to the standards of foreign similar products, and various test parameters are continuously corrected and adjusted. Finally, all physical and chemical performance indexes of various products reach the best;
2) simulating the construction condition of an electrolysis site according to parameters of an electrolytic cell masonry process and a paste binding process, and carrying out binding test and roasting test on the test paste so as to observe and compare the bonding condition of the novel paste in the actual process and the expansion and contraction condition of the paste in the roasting process;
3) various pastes required by 5-10 electrolytic cells are manufactured in a trial mode, industrial application tests are carried out on the electrolytic cells, the starting roasting curve of the electrolytic cells, the physical and chemical properties and the use conditions of products, particularly the expansion condition of the tamping paste before binder coking and the contraction condition of the tamping paste after coking are researched and tested, and the influence mechanism and the damage degree of the expansion and the contraction of the tamping paste on the structure of the electrolytic cells before and after binder coking are mastered and known.
And correcting and adjusting the formula, the types and the proportions of the binders, the process parameters and the starting curve of the product area again according to the test result, and selecting the most appropriate components and binders.
Claims (4)
1. The cathode tamping paste for the environment-friendly aluminum electrolysis cell is characterized by comprising the following components in parts by weight: the paint comprises the following components in parts by weight: 55-65 parts of aggregate, 35-45 parts of powder and 12-20 parts of binder;
the aggregate comprises electrically calcined coal aggregate, and the granularity of the electrically calcined coal aggregate is less than or equal to 10 mm;
the powder comprises electric calcined coal powder, artificial stone milled powder and cooked crushed powder, wherein the purity of the electric calcined coal powder is 50-55%, the purity of the artificial stone milled powder is 30-35%, and the purity of the cooked crushed powder is 55-60%;
the adhesive comprises rosin and dextrin, wherein the rosin accounts for 55-65% of the total amount of the adhesive.
2. The cathode tamping paste for the environment-friendly aluminum electrolytic cell as claimed in claim 1, wherein: the paint comprises the following components in parts by weight: 60 parts by weight of aggregate, 40 parts by weight of powder and 16 parts by weight of binder.
3. The cathode tamping paste for the environment-friendly aluminum electrolytic cell as claimed in claim 1, wherein: the rosin in the adhesive accounts for 60% of the total amount of the adhesive.
4. The cathode tamping paste for the environment-friendly aluminum electrolytic cell as claimed in claim 1, wherein: the adhesive is obtained by adding 60-70 ℃ water into the dextrin, uniformly stirring the dextrin and the rosin, and uniformly mixing the dextrin and the rosin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210187572.XA CN114457383B (en) | 2022-02-28 | 2022-02-28 | Cathode tamping paste for environment-friendly aluminum electrolysis cell |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210187572.XA CN114457383B (en) | 2022-02-28 | 2022-02-28 | Cathode tamping paste for environment-friendly aluminum electrolysis cell |
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| Publication Number | Publication Date |
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| CN114457383A true CN114457383A (en) | 2022-05-10 |
| CN114457383B CN114457383B (en) | 2023-05-23 |
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| CN202210187572.XA Active CN114457383B (en) | 2022-02-28 | 2022-02-28 | Cathode tamping paste for environment-friendly aluminum electrolysis cell |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116589292A (en) * | 2023-06-02 | 2023-08-15 | 平罗县中兴碳素有限公司 | Preparation method of high-conductivity cold ramming steel bar paste for aluminum electrolysis cell |
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2022
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| CN114457383B (en) | 2023-05-23 |
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