CN111548657A - Graphite electrode coating and preparation method thereof - Google Patents
Graphite electrode coating and preparation method thereof Download PDFInfo
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- CN111548657A CN111548657A CN202010589493.2A CN202010589493A CN111548657A CN 111548657 A CN111548657 A CN 111548657A CN 202010589493 A CN202010589493 A CN 202010589493A CN 111548657 A CN111548657 A CN 111548657A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/18—Fireproof paints including high temperature resistant paints
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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Abstract
The invention discloses a graphite electrode coating and a preparation method thereof, wherein the graphite electrode coating comprises the following raw materials in parts by weight: 50-55 parts of natural graphite powder, 30-40 parts of silicon carbide powder, 32-35 parts of compact corundum powder, 1-5 parts of dispersing agent and 1-5 parts of boride. The graphite electrode coating prepared by the invention adopts natural graphite, has good conductivity, does not need graphitization, solves the problems of high energy consumption and graphite electrode conductivity, screens raw materials after primary grinding and crushing, adopts a grain size distribution form to prepare the anti-oxidation coating, obviously improves the compactness of the coating, greatly reduces cracks and fine seams of the coating, and obviously improves the quality of the coating.
Description
Technical Field
The invention relates to the technical field of graphite electrodes, in particular to a graphite electrode coating and a preparation method thereof.
Background
The graphite electrode is a high-temperature resistant graphite conductive material which is prepared by using petroleum coke and pitch coke as aggregates and coal pitch as an adhesive through the steps of raw material calcination, crushing and grinding, batching, kneading, molding, roasting, dipping, graphitization and machining, is called an artificial graphite electrode (graphite electrode for short) and is different from a natural graphite electrode prepared by using natural graphite as a raw material.
The graphite material starts to be oxidized from about 400 ℃, the oxidation is increased rapidly after the temperature exceeds 750 ℃, and the oxidation is increased continuously along with the increase of the temperature. The oxidation corrosion under the high temperature condition can cause the surface structure of the graphite material to be loose, even to generate a shedding phenomenon, thereby affecting the normal use of the graphite device, and the heating efficiency is reduced, therefore, the surface of the graphite material is usually required to be coated with an oxidation resistant coating to enhance the oxidation resistance.
The electrified graphite electrode is easy to oxidize and corrode at high temperature, and chemical damage and physical damage are particularly serious at the part below the furnace cover of the electric furnace, especially the part contacting or approaching a melt. Generally, the chemical damage of the electrode is mainly caused by the oxidation of carbon element at high temperature, while the physical damage of the electrode is manifold, mainly including the mass transfer between the electrode and the melt, the ion migration when the current passes through, the mechanical action of the electric arc to the electrode, and the like. However, according to the prior art, most of the coatings have poor effects in the using process and cannot meet the requirements of reducing electrode consumption, prolonging service life and the like, so that a graphite electrode coating and a preparation method thereof are designed to solve the problems.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides a graphite electrode coating and a preparation method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
the graphite electrode coating comprises the following raw materials in parts by weight: 50-55 parts of natural graphite powder, 30-40 parts of silicon carbide powder, 32-35 parts of compact corundum powder, 1-5 parts of dispersing agent and 1-5 parts of boride.
As a preferable technical scheme of the invention, the feed comprises the following raw materials in parts by weight: 53 parts of natural graphite powder, 35 parts of silicon carbide powder, 33 parts of compact corundum powder, 3 parts of dispersing agent and 3 parts of boride.
As a preferable technical scheme of the invention, the dispersing agent is one or more of ammonium citrate, polyacrylamide and sodium tripolyphosphate.
According to a preferable technical scheme of the invention, the natural graphite powder is powder with a particle size of less than 0.05mm, and the boride is one of borax and boric acid.
A preparation method of graphite electrode paint comprises the following steps,
s1, respectively carrying out primary grinding on the raw materials such as the silicon carbide powder and the compact corundum powder through a grinder, and screening the ground raw materials through a standard sieve of 400 meshes;
s2, adding industrial phosphoric acid into the silicon carbide powder and the natural graphite powder, and stirring by a stirrer to obtain a mixed solution A;
s3, adding industrial phosphoric acid into the dense corundum powder, the boride and the dispersing agent, and stirring by a stirrer to obtain a mixed solution B;
and S4, mixing the mixed solution A, the mixed solution B and water to obtain the electrode paint.
In a preferred embodiment of the present invention, the concentration of industrial phosphoric acid in S2 and S3 is 85%.
As a preferable technical scheme of the invention, the stirring speed of the stirrer in S2 is 1000-1400 r/min, and the temperature in the reaction container is 30-32 ℃.
In a preferred embodiment of the present invention, in step S4, the mixed solution A, the mixed solution B and water are mixed in a container at a rotation speed of 15-25r/min for 10-50min
The graphite electrode coating prepared by the invention adopts natural graphite, has good conductivity and does not need graphitization, thus solving the problems of high energy consumption and graphite electrode conductivity, the raw materials are screened after being primarily ground and crushed, and the oxidation resistant coating is prepared in a particle size grading mode, the compactness of the coating is obviously improved, the cracks and the fine seams of the coating are greatly reduced, the quality of the coating is obviously improved, the natural graphite powder has a particle size of less than 0.05mm, has small particle size, is easy to form the coating, is also easy to form a sintering-state high-temperature protective coating at high temperature, has scientific and reasonable coating formula, outstanding oxidation resistance and good bonding property, and does not fall off when being sprayed or brushed on a graphite electrode; the invention has the advantages that the production process is simple, only simple preparation is needed, the graphite coating is a single component before preparation, and the transportation and the storage are convenient.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments.
Example one
The invention provides a graphite electrode coating which comprises the following raw materials in parts by weight: 50 parts of natural graphite powder, 30 parts of silicon carbide powder, 32 parts of compact corundum powder, 1 part of dispersing agent and 1 part of boride.
A preparation method of graphite electrode paint comprises the following steps,
s1, respectively carrying out primary grinding on the raw materials such as the silicon carbide powder and the compact corundum powder through a grinder, and screening the ground raw materials through a standard sieve of 400 meshes;
s2, adding industrial phosphoric acid into the silicon carbide powder and the natural graphite powder, and stirring by a stirrer to obtain a mixed solution A;
s3, adding industrial phosphoric acid into the dense corundum powder, the boride and the dispersing agent, and stirring by a stirrer to obtain a mixed solution B;
and S4, mixing the mixed solution A, the mixed solution B and water to obtain the electrode paint.
Example two
The invention provides a graphite electrode coating which comprises the following raw materials in parts by weight: 53 parts of natural graphite powder, 35 parts of silicon carbide powder, 33 parts of compact corundum powder, 3 parts of dispersing agent and 3 parts of boride.
A preparation method of graphite electrode paint comprises the following steps,
s1, respectively carrying out primary grinding on the raw materials such as the silicon carbide powder and the compact corundum powder through a grinder, and screening the ground raw materials through a standard sieve of 400 meshes;
s2, adding industrial phosphoric acid into the silicon carbide powder and the natural graphite powder, and stirring by a stirrer to obtain a mixed solution A;
s3, adding industrial phosphoric acid into the dense corundum powder, the boride and the dispersing agent, and stirring by a stirrer to obtain a mixed solution B;
and S4, mixing the mixed solution A, the mixed solution B and water to obtain the electrode paint.
EXAMPLE III
The invention provides a graphite electrode coating which comprises the following raw materials in parts by weight: 55 parts of natural graphite powder, 40 parts of silicon carbide powder, 35 parts of compact corundum powder, 5 parts of dispersing agent and 5 parts of boride.
A preparation method of graphite electrode paint comprises the following steps,
s1, respectively carrying out primary grinding on the raw materials such as the silicon carbide powder and the compact corundum powder through a grinder, and screening the ground raw materials through a standard sieve of 400 meshes;
s2, adding industrial phosphoric acid into the silicon carbide powder and the natural graphite powder, and stirring by a stirrer to obtain a mixed solution A;
s3, adding industrial phosphoric acid into the dense corundum powder, the boride and the dispersing agent, and stirring by a stirrer to obtain a mixed solution B;
and S4, mixing the mixed solution A, the mixed solution B and water to obtain the electrode paint.
The electrode coatings of three groups of embodiments are produced and coated on the surface of a graphite electrode, and then two groups of graphite electrode coatings commonly used in the market are adopted, and the electrode is respectively placed at 300 ℃ and normal temperature, so that the loss reduction of the electrode is detected;
| group of | Example one | Example two | EXAMPLE III | Comparison group one | Comparison group two |
| 300℃ | 10.7% | 12.7% | 10.1% | 4.2% | 3.5% |
| At normal temperature | 16.8% | 19.9% | 17.1% | 7.9% | 13.1% |
As can be seen from the above table, the loss reduction of the comparison group is significantly lower than that of the coating in the present embodiment, the graphite electrode coating of the present embodiment can form an ultra-high temperature resistant oxidation-resistant coating after being coated on the surface of the substrate of the graphite product and dried, and the coating has very stable chemical properties and is resistant to corrosion by chemicals such as alkali, acid, etc.; the coating can be adhered to the surface of a graphite matrix under a high-temperature condition, does not crack, has good sealing property, can effectively isolate air from directly contacting the graphite matrix under the severe working condition of a graphite electrode, and reduces the oxidation consumption of a graphite product under the high-temperature environment.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (8)
1. The graphite electrode coating is characterized by comprising the following raw materials in parts by weight: 50-55 parts of natural graphite powder, 30-40 parts of silicon carbide powder, 32-35 parts of compact corundum powder, 1-5 parts of dispersing agent and 1-5 parts of boride.
2. The graphite electrode coating as claimed in claim 1, which is characterized by comprising the following raw materials in parts by weight: 53 parts of natural graphite powder, 35 parts of silicon carbide powder, 33 parts of compact corundum powder, 3 parts of dispersing agent and 3 parts of boride.
3. The graphite electrode coating as claimed in claim 1, wherein the dispersant is one or more of ammonium citrate, ammonium polyacrylate and sodium tripolyphosphate.
4. The graphite electrode coating as claimed in claim 1, wherein the natural graphite powder is a powder having a particle size of 0.05mm or less, and the boride is one of borax and boric acid.
5. A preparation method of graphite electrode coating is characterized by comprising the following steps,
s1, respectively carrying out primary grinding on the raw materials such as the silicon carbide powder and the compact corundum powder through a grinder, and screening the ground raw materials through a standard sieve of 400 meshes;
s2, adding industrial phosphoric acid into the silicon carbide powder and the natural graphite powder, and stirring by a stirrer to obtain a mixed solution A;
s3, adding industrial phosphoric acid into the dense corundum powder, the boride and the dispersing agent, and stirring by a stirrer to obtain a mixed solution B;
and S4, mixing the mixed solution A, the mixed solution B and water to obtain the electrode paint.
6. The method for preparing graphite electrode coating according to claim 5, wherein the industrial phosphoric acid concentration in S2 and S3 is 85%.
7. The method for preparing the graphite electrode coating according to claim 5, wherein the stirring speed of the stirrer in S2 is 1000-1400 r/min, and the temperature in the reaction vessel is 30-32 ℃.
8. The method for preparing graphite electrode coating according to claim 5, wherein in S4, the mixed solution A, the mixed solution B and water are mixed in a container and mixed for 10-50min at a rotating speed of 15-25 r/min.
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| CN202010589493.2A CN111548657A (en) | 2020-06-24 | 2020-06-24 | Graphite electrode coating and preparation method thereof |
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| CN202010589493.2A CN111548657A (en) | 2020-06-24 | 2020-06-24 | Graphite electrode coating and preparation method thereof |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1052878A (en) * | 1989-12-27 | 1991-07-10 | 冶金部洛阳耐火材料研究院 | Anti-oxidation coating for graphite electrode |
| CN1070933A (en) * | 1992-09-18 | 1993-04-14 | 袁观银 | Antioxidant coating for graphite electrode |
| CN103642284A (en) * | 2013-12-12 | 2014-03-19 | 江西恒大高新技术股份有限公司 | High-temperature anti-oxidation coating of high-temperature graphite electrode |
| CN110002839A (en) * | 2019-05-17 | 2019-07-12 | 郑州市瑞沃耐火材料有限公司 | Graphite electrode antioxidant coating in electric furnace smelting |
| CN110072308A (en) * | 2019-04-22 | 2019-07-30 | 瑞泰科技股份有限公司湘潭分公司 | A kind of graphite electrode coating and preparation method |
| CN111117306A (en) * | 2019-12-24 | 2020-05-08 | 江阴硕人节能环保科技有限公司 | Graphite electrode coating and preparation method thereof |
-
2020
- 2020-06-24 CN CN202010589493.2A patent/CN111548657A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1052878A (en) * | 1989-12-27 | 1991-07-10 | 冶金部洛阳耐火材料研究院 | Anti-oxidation coating for graphite electrode |
| CN1070933A (en) * | 1992-09-18 | 1993-04-14 | 袁观银 | Antioxidant coating for graphite electrode |
| CN103642284A (en) * | 2013-12-12 | 2014-03-19 | 江西恒大高新技术股份有限公司 | High-temperature anti-oxidation coating of high-temperature graphite electrode |
| CN110072308A (en) * | 2019-04-22 | 2019-07-30 | 瑞泰科技股份有限公司湘潭分公司 | A kind of graphite electrode coating and preparation method |
| CN110002839A (en) * | 2019-05-17 | 2019-07-12 | 郑州市瑞沃耐火材料有限公司 | Graphite electrode antioxidant coating in electric furnace smelting |
| CN111117306A (en) * | 2019-12-24 | 2020-05-08 | 江阴硕人节能环保科技有限公司 | Graphite electrode coating and preparation method thereof |
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