CN107043276B - Graphite electrode protection method - Google Patents

Graphite electrode protection method Download PDF

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Publication number
CN107043276B
CN107043276B CN201710276386.2A CN201710276386A CN107043276B CN 107043276 B CN107043276 B CN 107043276B CN 201710276386 A CN201710276386 A CN 201710276386A CN 107043276 B CN107043276 B CN 107043276B
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graphite electrode
tio
sio
micro powder
mixed micro
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CN107043276A (en
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黄家旭
程晓哲
王唐林
王东生
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Pangang Group Research Institute Co Ltd
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Pangang Group Research Institute Co Ltd
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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
    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/80—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only ceramics
    • C04B41/81—Coating or impregnation
    • C04B41/85—Coating or impregnation with inorganic materials
    • C04B41/87—Ceramics
    • 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
    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/009—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone characterised by the material treated
    • 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
    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
    • C04B41/50—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
    • C04B41/5053—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials non-oxide ceramics
    • C04B41/5057—Carbides
    • 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
    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
    • C04B41/50—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
    • C04B41/5053—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials non-oxide ceramics
    • C04B41/5057—Carbides
    • C04B41/5059—Silicon carbide
    • 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
    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
    • C04B41/50—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
    • C04B41/5053—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials non-oxide ceramics
    • C04B41/5062—Borides, Nitrides or Silicides

Abstract

The invention discloses a graphite electrode protection method in the technical field of high-temperature smelting, which comprises the following steps: firstly, the graphite electrode is heated, and then,the surface temperature of the graphite electrode reaches more than 1500 ℃, and then SiO is sprayed on the surface of the incandescent graphite electrode by high-pressure nitrogen2And TiO2The mixed micro powder of (2) forms a compact carbide or nitride coating on the surface of the graphite electrode through reduction reaction and nitridation reaction. The invention has the beneficial effects that: blowing SiO to surface of incandescent graphite electrode by high-pressure nitrogen2And TiO2The mixed micro powder forms a compact carbide or nitride coating on the surface of the graphite electrode through reduction reaction and nitridation reaction, plays a role in isolating the graphite electrode body, thereby slowing down the oxidation consumption speed of the graphite electrode, and the protective coating is compactly combined with the surface of the graphite electrode, is not easy to fall off, does not influence the conductivity of the graphite electrode, prolongs the service life of the graphite electrode, and reduces the production cost of the electric furnace.

Description

Graphite electrode protection method
Technical Field
The invention relates to the technical field of high-temperature smelting, in particular to a graphite electrode protection method suitable for an intermittent smelting electric furnace.
Background
The electric furnace is widely used in the fields of titanium slag smelting, alloy smelting, steel making and iron making and the like at present, and the graphite electrode is used as a conductive material produced by the electric furnace due to the characteristics of good conductivity, excellent heat resistance and excellent corrosion resistance. However, the erosion and erosion consumption of the smelting slag to the electrode and the oxidation consumption exposed in the air all reduce the service life of the graphite electrode to a certain extent. The conventional graphite electrode protection methods comprise graphite electrode coating protection, impregnation layer protection and the like, but the conventional methods can reduce the conductivity of the graphite electrode, are easy to fall off after being wetted and have limited protection on the surface of the graphite electrode.
Disclosure of Invention
In order to overcome the defects that the coating and the dipping layer of the prior graphite electrode are easy to fall off, influence the conductivity and the like, the invention aims to solve the technical problems that: provided is a method capable of improving the stability and conductivity of a graphite electrode protective layer.
The technical scheme adopted by the invention for solving the technical problems is as follows: a graphite electrode protection method comprises the following steps: firstly heating the graphite electrode to make its surface temp. be up to above 1500 deg.C, then using high-pressure nitrogen gas to spray S on the surface of incandescent graphite electrodeiO2And TiO2The mixed micro powder of (2) forms a compact carbide or nitride coating on the surface of the graphite electrode through reduction reaction and nitridation reaction.
Further, the graphite electrode was heated to 1600 ℃.
Further, the SiO2And TiO2The granularity of the mixed micro powder is less than or equal to 200 meshes.
Further, SiO is blown2And TiO2The fine powder mixture of (2) is sprayed for a period of not more than 20 seconds.
Further, SiO in the sprayed fine mixed powder2And TiO2The mass ratio of (A) to (B) is 1: 1-5: 1.
The invention has the beneficial effects that: blowing SiO to surface of incandescent graphite electrode by high-pressure nitrogen2And TiO2The mixed micro powder forms a compact carbide or nitride coating on the surface of the graphite electrode through reduction reaction and nitridation reaction, plays a role in isolating the graphite electrode body, thereby slowing down the oxidation consumption speed of the graphite electrode, and the protective coating is compactly combined with the surface of the graphite electrode, is not easy to fall off, does not influence the conductivity of the graphite electrode, prolongs the service life of the graphite electrode, and reduces the production cost of the electric furnace.
Detailed Description
The invention is further described below by means of specific embodiments.
A graphite electrode protection method comprises the following steps: firstly heating the graphite electrode to make its surface temp. be up to above 1500 deg.C, then using high-pressure nitrogen gas to spray SiO on the surface of incandescent graphite electrode2And TiO2The mixed micro powder of (2) forms a compact carbide or nitride coating on the surface of the graphite electrode through reduction reaction and nitridation reaction. In the actual operation, the method can be carried out in the slag tapping stage of each smelting of the electric furnace, and the graphite electrode still has higher temperature during slag tapping, so that the spraying and coating operation can be directly carried out. Before the mixed micro powder is sprayed, an infrared thermometer is used for measuring the surface temperature of the graphite electrode, the temperature must be more than or equal to 1500 ℃, and carbon particles on the surface of the graphite electrode are difficult to react with the mixed micro powder below the temperature.Theoretical analysis and experiments show that the temperature of about 1600 ℃ can bring the best reaction effect. The nitrogen is used as a blowing medium, so that a nitride layer can be formed on the surface of the graphite electrode, and other components in the air are prevented from influencing the graphite electrode.
In order to ensure that the carbonization-reduction reaction is rapidly carried out on the surface of the graphite electrode, SiO2And TiO2The granularity of the mixed micro powder is required to be less than or equal to 200 meshes. Too large particle size can cause insufficient reaction between the micro powder particles and the surface layer of the graphite electrode, and the micro powder particles are not firmly bonded and easily fall off.
The spraying time of the mixed micro powder is not more than 20s generally, because the graphite electrode is exposed in the air when the micro powder is sprayed, and the graphite electrode is easy to react with other components in the air after too long time, thereby influencing the quality of a good coating of the graphite electrode.
Therefore, SiO is selected2And TiO2The mixed fine powder of (2) is SiO2Compared with TiO2The former reacts more easily with carbon particles at the same temperature, but the latter carbides are more resistant to high temperature and corrosion. The mixture of the two can have the double characteristics of high temperature resistance and corrosion resistance. In order to ensure the stability and isolation of the coating and to have a certain thickness, SiO is required2And TiO2The mass ratio of (A) to (B) is 1: 1-5: 1.
The first embodiment is as follows:
titanium slag is smelted at the bottom of a certain 50kVA direct current electric arc furnace, and the diameter of a graphite electrode is 75mm, and the length is 800 mm. In the slag discharging stage of titanium slag smelting, the slag is discharged without power interruption, and the actual measurement shows that the surface temperature of the graphite electrode is 1600 ℃. At this time, 150-200 mesh SiO2And TiO2The mixed micro powder is sprayed to the surface of the graphite electrode through nitrogen, and the mass of the mixed micro powder and the graphite electrode is 1: blowing time 1, 10 s. After cooling, a protective coating was observed on the surface of the graphite electrode. Physical and chemical detection is carried out on the protective coating, and the protective coating is found to be compactly combined with the surface of the graphite electrode, so that the surface of the original graphite electrode is completely wrapped in the protective coating, the conductivity of the graphite electrode is not influenced by the protective coating, and the protective coating has stable chemical properties and is difficult to react with other substances. In summary, the graphite electrode protective layer obtained by the methodThe graphite electrode is compactly combined with the surface of the graphite electrode, is not easy to fall off, does not influence the conductivity of the graphite electrode, can prolong the service life of the graphite electrode, and reduces the production cost of the electric furnace.

Claims (3)

1. A graphite electrode protection method is characterized by comprising the following steps: firstly heating the graphite electrode to make its surface temp. be up to above 1500 deg.C, then using high-pressure nitrogen gas to spray SiO on the surface of incandescent graphite electrode2And TiO2The mixed micro powder forms a compact carbide or nitride coating on the surface of the graphite electrode through reduction reaction and nitridation reaction, and the SiO is2And TiO2The particle size of the mixed micro powder is less than or equal to 200 meshes, and SiO in the mixed micro powder2And TiO2The mass ratio of (A) to (B) is 1: 1-5: 1.
2. The method for protecting a graphite electrode as claimed in claim 1, wherein: the graphite electrode was heated to 1600 ℃.
3. The method for protecting a graphite electrode as claimed in claim 1, wherein: blowing SiO2And TiO2The fine powder mixture of (2) is sprayed for a period of not more than 20 seconds.
CN201710276386.2A 2017-04-25 2017-04-25 Graphite electrode protection method Active CN107043276B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2788294C1 (en) * 2022-06-28 2023-01-17 федеральное государственное бюджетное образовательное учреждение высшего образования "Санкт-Петербургский горный университет" Method for protection of graphitized electrodes from high-temperature oxidation

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109456060B (en) * 2018-11-23 2020-07-28 大同新成新材料股份有限公司 Anti-oxidation graphite electrode with sound insulation and noise absorption functions and preparation method thereof

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1098794A (en) * 1912-10-29 1914-06-02 Nat Carbon Co Article with protective coating.
CN87102214A (en) * 1986-03-20 1987-10-14 赖搏尔德-斯特里克股份公司 Method for making with graphite mo(u)ld goods of conduction and oxidation-stable coating
US5254359A (en) * 1989-06-02 1993-10-19 Air Products And Chemicals, Inc. Method of forming titanium nitride coatings on carbon/graphite substrates by electric arc thermal spray process using titanium feed wire and nitrogen as the atomizing gas

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009107884A1 (en) * 2008-02-28 2009-09-03 Changwon National University Industry Academy Cooperation Corps Synthetic method for anti-oxidation ceramic coatings on graphite substrates

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1098794A (en) * 1912-10-29 1914-06-02 Nat Carbon Co Article with protective coating.
CN87102214A (en) * 1986-03-20 1987-10-14 赖搏尔德-斯特里克股份公司 Method for making with graphite mo(u)ld goods of conduction and oxidation-stable coating
US5254359A (en) * 1989-06-02 1993-10-19 Air Products And Chemicals, Inc. Method of forming titanium nitride coatings on carbon/graphite substrates by electric arc thermal spray process using titanium feed wire and nitrogen as the atomizing gas

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2788294C1 (en) * 2022-06-28 2023-01-17 федеральное государственное бюджетное образовательное учреждение высшего образования "Санкт-Петербургский горный университет" Method for protection of graphitized electrodes from high-temperature oxidation

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