CN101052251A - Dipping type anti-oxidant for improving graphite electrode performance of electric arc steelmaking - Google Patents
Dipping type anti-oxidant for improving graphite electrode performance of electric arc steelmaking Download PDFInfo
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Abstract
The invention comprises: solid constituent aluminium phosphate, silicon dioxide, alumina and aqueous solution. The grain size of said solid constituent is 0.01-1 mu m oxide particle stably dispersed in the aqueous solution to form multi phase suspended liquid. Calculated based on the 100% of solid constituent weight, wherein, the aluminium phosphate is 40wt%-64wt%, the silicon dioxide is 30wt%-57wt%; the alumina is 1wt%-6wt%; the heat-resistance of oxidation resistance ceramic film formed using the invention can reach 1400 deg.c The fluid graphite electrode is dipped in the invention, and after drying, an oxidation resistance ceramic film is formed on the graphite electrode.
Description
Technical field
The present invention relates to graphite electrode, particularly a kind ofly be used to improve electric arc steelmaking with the high-temperature oxidation resistance of graphite electrode and the dipping type anti-oxidant of high temperature break resistant intensity.
Background technology
Graphite is unique industrial materials that are suitable for electric-arc furnace steelmaking with electrode, and its weak point is that oxidation resistance is poor.In electric-arc furnace steelmaking, oxidational losses partly reaches 40%～70% of consumption of electrode total amount.40%～70% of the graphite electrode that uses in electric-arc furnace steelmaking is owing to reacting with airborne oxygen and having consumed in vain.Graphite electrode itself is a kind of highly energy-consuming product, and only electric energy just need be more than the consumption 4000kwh to produce 1 ton of graphite electrode, and the consumption that reduces graphite electrode can reduce energy consumption and the production cost that electric-arc furnace steelmaking is produced effectively.
By forming the oxidation-resistant ceramic film, be the effective ways that reduce the graphite electrode oxidization burning loss at graphite electrode surface.Following technology and product are arranged in the market:
1, is coated with high temperature anti-oxidation coating at electrode surface
This technology once obtained popularization with one of effective method of graphite electrode oxidational losses in electric-arc furnace steelmaking factory as reducing arc furnace.But resist the poor performance of mechanical shock and thermal shock with the oxidation-resistant ceramic film that the method generates at electrode surface, be easy to peel off from electrode surface, and along with increasing considerably and the use of electrode water spray cooling technology of electric-arc furnace steelmaking power, the oxidation-resistant ceramic film that forms with the method can not reach the requirement of conductivity and resistance to water fully and be terminated use.
2, motlten metal, melten glass are to the dipping of graphite electrode
Means by high temperature pressurization down, decompression immerse motlten metal, melten glass in the hole of graphite electrode, to improve its oxidation resistance.But because need impregnating equipment complexity, cost under the high temperature too high and do not applied.
3, add the non-oxidizability dusty material in the graphite electrode raw material
Add B in the raw material of graphite electrode
4C, SiC, SiB
2In powder, through be shaped and high-temperature calcination after on the surface of graphite electrode and the inner surface of hole generate the oxidation-resistant ceramic film of borosilicate.Because B in this material
4C, SiC, SiB
2Content reach more than the 40wt%, cause the deterioration of its conductivity and thermal shock resistance, be not suitable for the graphite electrode of requirement satisfactory electrical conductivity and thermal-shock resistance.
4, the dipping of BAS
After being dissolved in boric acid in the aqueous solution or the organic solution, it is immersed graphite electrode, at the inner surface generation boric acid film of graphite electrode surface and hole thereof.The heat resisting temperature of the boric acid film that forms at graphite electrode surface is lower than 1000 ℃.And because the water-resistance of boric acid film is poor, present most of electrical arc furnace has all been installed the water-cooled shower nozzle of cooling electrode at the electrode holde place, but is to use this technology not have much effects.
5, generate SiO with dipping method at graphite electrode surface
2-Al
2O
3-phosphoric acid is ceramic membrane
Use a kind of suspension and water paint of mixing of phosphoric acid, boric acid by silicon dioxide, aluminium oxide, graphite electrode forms SiO at the inner surface of its surface and hole behind this coating dipping
2-Al
2O
3-P
2O
5-B
2O
3It is ceramic membrane.When the serviceability temperature of graphite electrode is higher than 1000 ℃, formed SiO
2-Al
2O
3-P
2O
5-B
2O
3Be ceramic membrane because the boiling point low (being lower than 300 ℃) of phosphoric acid and boric acid, volatile, the continuity of film is destroyed under the high temperature, has lost antioxidant effect.That is to say that this graphite electrode anti-oxidant prevents that serviceability temperature that agent is only applicable to graphite electrode is lower than the non-oxidizability that could improve graphite electrode under 1000 ℃ the temperature range situation.
Summary of the invention
Task of the present invention provides a kind of new raising the electric arc steelmaking high-temperature oxidation resistance of graphite electrode and the dipping type anti-oxidant of high temperature break resistant intensity, it has solved the conductivity and the poor water resistance of above-mentioned prior art and product, the production equipment complexity, cost is too high, the problem of service condition harshness.
Technical solution of the present invention is as follows:
A kind of dipping type anti-oxidant that improves graphite electrode performance of electric arc steelmaking, adopt liquid antioxidant to be coated in graphite electrode surface or be impregnated in the minute aperture of graphite, allow after the water evaporates, form the oxidation-resistant ceramic film at graphite electrode surface and graphite electrode minute aperture inner surface, contain the solid constituent aluminum phosphate in the described liquid antioxidant, silicon dioxide and aluminium oxide and the aqueous solution, its particle diameter of described solid constituent is that the oxide particle of 0.01～1 μ m stably is dispersed in the heterogeneous suspension liquid of formation in the aqueous solution, weight 100% by solid constituent is calculated, wherein aluminum phosphate is 40wt%～64wt%, silicon dioxide 30wt%～57wt%, alundum (Al 1wt%～6wt%, the heat resisting temperature of formed oxidation-resistant ceramic film reach 1400 ℃.
Liquid graphite electrode is flooded in graphite electrode with dipping type anti-oxidant of the present invention, after drying, at the inner surface generation oxidation-resistant ceramic film of graphite electrode surface and hole.The heat resisting temperature of this oxidation-resistant ceramic film reaches 1400 ℃.The oxidation-resistant ceramic film stably covers graphite electrode surface, has stoped the oxygen in the atmosphere to graphite electrode surface and along hole moving to inside effectively.
After graphite electrode floods liquid antioxidant of the present invention, the oxidation-resistant ceramic film that can form is especially at the temperature range good stability that is higher than 1100 ℃, and the graphite electrode behind dipping uses under the temperature range condition more than 1100 ℃ also good antioxygenic property.
Use dipping type anti-oxidant of the present invention, can improve the high-temperature oxidation resistance and the high temperature break resistant intensity of graphite electrode, reduce the consumption of graphite electrode in the electric-arc furnace steelmaking.
Description of drawings
Fig. 1 is the electron microscopic picture of the formed oxidation-resistant ceramic film of the dipping liquid antioxidant of the present invention in graphite electrode.
Fig. 2 is the picture that part is amplified among Fig. 1.
Fig. 3 represents the relation of temperature-rise period graphite sample oxygenation efficiency and temperature.
Fig. 4 represents to use the changes in contrast situation of the graphite electrode consumption of electric-arc furnace steelmaking before and after the antioxidant of the present invention.
Fig. 5 is the rupture strength reduced parameter table that the graphite electrode sample floods antioxidant of the present invention front and back.
Fig. 6 is not with the graphite electrode sample of antioxidant dipping and the comparison diagram of the graphite electrode sample that uses antioxidant dipping of the present invention.
Embodiment
Referring to Fig. 1 and Fig. 2, the present invention is a kind of the electric arc steelmaking high-temperature oxidation resistance of graphite electrode and dipping type anti-oxidant of high temperature break resistant intensity of improving, the graphite electrode of using to electric-arc furnace steelmaking floods the liquid antioxidant of this immersion-type, after drying at room temperature, sclerosis, form fine and close oxidation-resistant ceramic film, reduced the surface area that graphite electrode contacts with air at graphite electrode surface and fine-pored inner surface.The heat resisting temperature of this oxidation-resistant ceramic film reaches 1400 ℃, has reduced the oxidation rate of graphite electrode under high-temperature oxydation atmosphere effectively, has improved the high temperature break resistant intensity of graphite electrode simultaneously.
Dipping type anti-oxidant of the present invention is a base-material with the inorganic high-temperature agglomerant aluminium phosphate aqueous solution, to the oxide of wherein dispersed silicon, aluminium, titanium, zirconium, boron and form liquid antioxidant, and its good fluidity, apparent viscosity is less than 50mPas; Again because good with the wetability of graphite electrode material, be easy to sprawl and be impregnated in minute aperture in the graphite electrode or small crackle, the defective at graphite electrode surface, after dehydration, drying, repair graphite electrode surface and underbead crack, defective, thereby improve the high temperature break resistant intensity of graphite electrode.
Contain solid constituent aluminum phosphate, silicon dioxide and aluminium oxide and the aqueous solution in the liquid antioxidant of the present invention.The particle diameter of the oxide particle of solid constituent is 0.01～1 μ m, and oxide particle stably is dispersed in and forms heterogeneous suspension liquid in the aqueous solution.Remove wherein moisture, calculate by the weight 100% of solid constituent, wherein aluminum phosphate is 40wt%～64wt%, silicon dioxide 30wt%～57wt%, aluminium oxide 1wt%～6wt%.
Also contain solid constituent titanium dioxide 0.1wt%～3wt%, diboron trioxide 0.5wt%～3wt% and zirconium dioxide 0.1wt%～1wt% in the liquid antioxidant of the present invention.
This liquid antioxidant is made up of the aqueous solution and oxide solid, and wherein the aqueous solution accounts for 70%, and oxide solid accounts for 30%, and its stability was greater than 6 months, and wherein dispersed particle does not precipitate, and viscosity can not rise with the prolongation in storage time yet.
Referring to Fig. 3, Fig. 3 has represented to use dipping type anti-oxidant impregnated graphite electrode sample of the present invention, the oxygenation efficiency after drying and the relation of oxidizing temperature, and with the contrast situation of doing without the experimental result of this antioxidant impregnation process.1. uppermost curve is not with the heated oxide curve of the graphite electrode sample of this antioxidant dipping among Fig. 3.
Wherein, sample weight * 100% before the oxygenation efficiency of graphite electrode sample=(sample weight after the preceding sample weight-oxidation of oxidation) ÷ oxidation
With apparent porosity be 24.8%, purity is that cylindrical sample that 99.99% graphite electrode is processed into diameter 50mm, high 50mm is equipped with experiment and uses.The graphite electrode sample is put into small-sized antioxidant dipping tank, inject liquid antioxidant of the present invention, under normal pressure, soak and flooded in 20 minutes.Then, 200 ℃ of dryings of temperature 60 minutes.
Sample bench is placed on the balance under the heating furnace, various graphite electrode samples are placed on the sample bench, with the programming rate to 1600 of 5 ℃ of per minutes ℃, the weight of a sample of 50 ℃ of records of every intensification, weight is calculated the oxygenation efficiency of sample thus.
Referring to Fig. 4, Fig. 4 has shown the changes in contrast situation of the graphite electrode consumption that uses antioxidant of the present invention front and back electric-arc furnace steelmaking.Wherein, used electrode diameter is 14 inches, and the arc furnace nominal capacity is 30 tons.Behind the graphite electrode dipping antioxidant, obviously less than the situation before the dipping, graphite electrode consumption can reduce by 22%～28% to its consumption situation.
Referring to Fig. 5, Fig. 5 has shown that the graphite electrode sample floods the rupture strength reduced parameter before and after the antioxidant of the present invention, and behind the graphite electrode sample dipping antioxidant, its rupture strength is the situation before the dipping antioxidant in the time of 300 ℃ to 900 ℃.
Performance to each solid constituent of dipping type anti-oxidant of the present invention is described in detail below.
One, aluminum phosphate is as one of principal component of antioxidant.
Aluminum phosphate is a purposes inorganic high-temp bonding agent very widely in the industrial materials.Liquid antioxidant as base-material, is equipped with an amount of silicon dioxide, alundum (Al, diboron trioxide with aluminium phosphate aqueous solution.With its coating be immersed in graphite electrode surface or the minute aperture of graphite electrode in, through the drying at room temperature film forming of can hardening, just can form water-fast and the cold and hot adhesion of graphite electrode is that thermal-shock resistance is good, adeciduate oxidation-resistant ceramic film at 300 ℃.
In the solid constituent of antioxidant, aluminum phosphate content is 40wt%～64wt%, is preferably 45wt%～55wt%.If its content is lower than 40wt%, behind the graphite electrode dipping, drying at room temperature can not form stable film; If its content is higher than 64wt%, the film forming of can not hardening at normal temperatures.
Aluminum phosphate is that dihydro aluminum phosphate or generation aluminum phosphate are best with aluminium dihydrogen phosphate.Aluminium dihydrogen phosphate can be water-soluble, and disperse diboron trioxide B to it
2O
3Also can obtain more low viscous dispersion less than 50mPas.
Two, silicon dioxide is as one of principal component of antioxidant.
Silicon dioxide is a kind of aboundresources, inexpensive, good film-forming property, be widely used in sol-gel process forms oxide ceramic film.
In the solid constituent of antioxidant, dioxide-containing silica is 30wt%～57wt%, is preferably 30wt%～50wt%.If its content is lower than 30wt%, then the compactness of oxidation-resistant ceramic film is bad; If its content is higher than 57wt%, the heat resisting temperature that makes the oxidation-resistant ceramic film is lower than 1300 ℃.
Silicon dioxide is best with amorphous silica.Amorphous silica is easy to be dispersed into suspension liquid in the aqueous solution.Also the suspension of available silicon dioxide replaces SiO 2 powder.
The particle diameter of silicon dioxide is preferably 0.01～1 μ m less than 1 μ m.If its particle diameter is greater than 1 μ m, it is very difficult that the dispersion in aluminium phosphate aqueous solution will become, and the stability of disperse system reduces, and the holding time will shorten significantly.
Three, alundum (Al is as one of principal component of antioxidant.
The speed that in liquid antioxidant, adds an amount of alundum (Al and sclerosis film forming at room temperature dry to the liquid antioxidant in the graphite electrode with facilitating impregnation.Be higher than 1000 ℃ temperature range in the graphite electrode serviceability temperature, alundum (Al and silicon dioxde reaction generate alumina silicate (mullite) composite oxides, will increase substantially the compactness of the stability at elevated temperature and the film of oxidation-resistant ceramic film.
In the solid constituent of antioxidant, alumina content is 1wt%～6wt%, is preferably 2wt%～5wt%.If its content is lower than 1wt%, then do not have the effect of the compactness of the high-temperature stability that improves the oxidation-resistant ceramic film and film; If its content is higher than 6wt%, more than 1000 ℃ the time, the compactness of oxidation-resistant ceramic film reduces on the contrary, and the effect of oxidation-resistant ceramic film descends.
The particle diameter of alundum (Al is preferably 0.01～0.1 μ m less than 1 μ m.If its particle diameter is greater than 1 μ m, it is very difficult that the dispersion in the aqueous solution will become, and the stability of disperse system reduces, but the holding time will shorten significantly.
Alundum (Al is best with amorphous alundum (Al or β-alundum (Al, also can use the hydrosol of alundum (Al.
Four, diboron trioxide is as one of adding ingredient of antioxidant.
Adding diboron trioxide in antioxidant can make the film with the aluminum phosphate base-material just have very strong resistance to water at 300 ℃.And diboron trioxide at high temperature is easy to generate borosilicate with silicon dioxide.Because the generation of borosilicate,, improve antioxidant effect with improving the oxidation-resistant ceramic film widely under the temperature more than 1200 ℃ and the hot adhesiveness and the compactness of graphite electrode.
In the solid constituent of antioxidant, diboron trioxide content is 0.5wt%～3wt%, is preferably 1wt%～3wt%.If its content is lower than 0.5wt%, just can not improve the resistance to water of oxidation-resistant ceramic film; But when its content is higher than 3wt%, at normal temperatures can not dry, sclerosis film forming behind the graphite electrode dipping, the also easy moisture absorption behind the heat drying can not form firm oxidation-resistant ceramic film.
Diboron trioxide can or contain boron phosphate and the mixture of diboron trioxide with highly purified diboron trioxide.
Five, titanium dioxide is as one of adding ingredient of antioxidant.
In antioxidant, add titanium dioxide and be the important means that keeps oxide film compactness when improving more than the temperature to 1200 ℃.
In the solid constituent of antioxidant, content of titanium dioxide is 0.1wt%～3wt%, is preferably 0.5wt%～2wt%.If its content is lower than 0.1wt%, then do not have the effect that improves oxidation-resistant ceramic film compactness; If its content is higher than 2wt%, in aluminum phosphate solution, can not disperse to form the dispersion that good stability, viscosity are lower than 50mPas.
The particle diameter of titanium dioxide is preferably 0.01～0.05 μ m less than 1 μ m.If its particle diameter is less than 0.01 μ m, because of powder price is too high, production cost will increase substantially; If particle diameter, reach the purpose that stable dispersion also can store the long period in the aqueous solution greater than 1 μ m, must improve the viscosity of disperse system, so just make dip operation become very difficult.
Titanium dioxide with unsetting titanium dioxide for well.Available acid tio_2 suspension replaces.
Six, zirconium dioxide is as one of adding ingredient of antioxidant.
In antioxidant, add zirconium dioxide and will improve the stability of oxidation-resistant ceramic film under the serviceability temperature more than 1400 ℃.Stop the oxidation-resistant ceramic film to occur in the contraction that the graphite material surface is produced, keep the integrality of oxidation-resistant ceramic film at graphite electrode surface because of fusion.
Zirconium dioxide can be any one material of high-purity titanium dioxide zirconium powder, zirconium silicate, basic zirconium phosphate or these three kinds of materials are added simultaneously.
In the solid constituent of antioxidant, zirconium dioxide content is 0.1wt%～1wt%, is preferably 0.2wt%～0.4wt%.If its content is lower than 0.1wt%, then do not have the fusing point that improves the oxidation-resistant ceramic film, the shrinkage phenomenon that is produced on the graphite material surface that stops the oxidation-resistant ceramic film to take place because of fusion; If its content is higher than 1wt%, then can not in aluminium phosphate aqueous solution, form the dispersion of good stability.
The particle diameter of zirconium dioxide, zirconium silicate or basic zirconium phosphate is preferably 0.01～0.05 μ m less than 1 μ m.If its particle diameter is less than 0.01 μ m, because of powder price is too high, production cost will increase substantially; If the purpose that particle diameter, reach the stable dispersion in the aqueous solution greater than 1 μ m and can store the long period, the necessary viscosity that improves disperse system so just makes dip operation become very difficult.
Further describe the part embodiment of each constituent content of dipping type anti-oxidant of the present invention below.
Embodiment 1:
In conjunction with referring to Fig. 3,2. curve is the heated oxide curve behind the graphite electrode sample dipping antioxidant, this antioxidant ingredients comprises the 12.1wt% aluminum phosphate, 13wt% silicon dioxide (particle diameter 0.03～0.05 μ m), 4.5wt% alundum (Al (particle diameter 0.03～0.05 μ m), 0.25wt% diboron trioxide, and 70.15wt% water.Solid constituent with antioxidant is calculated, and aluminum phosphate content is 40.5wt%, and dioxide-containing silica is 43.6wt%, and alundum (Al content is 15.1wt%, and diboron trioxide content is 0.8wt%.
Embodiment 2:
In conjunction with referring to Fig. 3,3. curve is the heated oxide curve behind the graphite electrode sample dipping antioxidant, this antioxidant ingredients comprises the 15wt% aluminum phosphate, 13wt% silicon dioxide (particle diameter 0.03～0.05 μ m), 1.5wt% alundum (Al (particle diameter 0.03～0.05 μ m), 0.5wt% diboron trioxide, and 70wt% water.Solid constituent with antioxidant is calculated, and aluminum phosphate content is 50wt%, and dioxide-containing silica is 43.3wt%, and alundum (Al content is 5wt%, and diboron trioxide content is 1.7wt%.
Embodiment 3:
In conjunction with referring to Fig. 3,4. curve is the heated oxide curve behind the graphite electrode sample dipping antioxidant, this antioxidant ingredients comprises the 15wt% aluminum phosphate, 12.5wt% silicon dioxide (particle diameter 0.03～0.05 μ m), 1.5wt% alundum (Al (particle diameter 0.03～0.05 μ m), the 0.5wt% diboron trioxide, 0.5wt% titanium dioxide, and 70wt% water.Solid constituent with antioxidant is calculated, and aluminum phosphate content is 50wt%, and dioxide-containing silica is 41.7wt%, and alundum (Al content is 5wt%, and diboron trioxide content is 1.7wt%, and content of titanium dioxide is 1.6wt%.
Embodiment 4:
In conjunction with referring to Fig. 3,5. curve is the heated oxide curve behind the graphite electrode sample dipping antioxidant, this antioxidant ingredients comprises the 15wt% aluminum phosphate, 12.2wt% silicon dioxide (particle diameter 0.03～0.05 μ m), 1.5wt% alundum (Al (particle diameter 0.03～0.05 μ m), 0.5wt% diboron trioxide, 0.5wt% titanium dioxide, 0.3wt% zirconium dioxide, and 70wt% water.Solid constituent with antioxidant is calculated, and aluminum phosphate content is 50wt%, and dioxide-containing silica is 40.7wt%, and alundum (Al content is 5wt%, and diboron trioxide content is 1.7wt%, and content of titanium dioxide is 1.6wt%, and zirconium dioxide content is 1wt%.
Embodiment 5:
This antioxidant ingredients comprises the 12wt% aluminum phosphate, 17.1wt% silicon dioxide, 0.9wt% alundum (Al, and 70wt% water.Solid constituent with antioxidant is calculated, and aluminum phosphate content is 40wt%, and dioxide-containing silica is 57wt%, and alundum (Al content is 3wt%.
Embodiment 6:
This antioxidant ingredients comprises the 12wt% aluminum phosphate, 16.2wt% silicon dioxide, 1.8wt% alundum (Al, and 70wt% water.Solid constituent with antioxidant is calculated, and aluminum phosphate content is 40wt%, and dioxide-containing silica is 54wt%, and alundum (Al content is 6wt%.
Embodiment 7:
This antioxidant ingredients comprises the 19.2wt% aluminum phosphate, 10.5wt% silicon dioxide, 0.3wt% alundum (Al, and 70wt% water.Solid constituent with antioxidant is calculated, and aluminum phosphate content is 64wt%, and dioxide-containing silica is 35wt%, and alundum (Al content is 1wt%.
Embodiment 8:
This antioxidant ingredients comprises the 19.2wt% aluminum phosphate, 9wt% silicon dioxide, 1.8wt% alundum (Al, and 70wt% water.Solid constituent with antioxidant is calculated, and aluminum phosphate content is 64wt%, and dioxide-containing silica is 30wt%, and alundum (Al content is 6wt%.
Embodiment 9:
This antioxidant ingredients comprises the 11.1wt% aluminum phosphate, 17.1wt% silicon dioxide, 1.8wt% alundum (Al, and 70wt% water.Solid constituent with antioxidant is calculated, and aluminum phosphate content is 40wt%, and dioxide-containing silica is 57wt%, and alundum (Al content is 6wt%.
Embodiment 10:
This antioxidant ingredients comprises the 14.4wt% aluminum phosphate, 12.9wt% silicon dioxide, 1.5wt% alundum (Al, 1.2wt% diboron trioxide, and 70wt% water.Solid constituent with antioxidant is calculated, and aluminum phosphate content is 48wt%, and dioxide-containing silica is 43wt%, and alundum (Al content is 5wt%, and diboron trioxide content is 4wt%.
Embodiment 11:
This antioxidant ingredients comprises the 14.4wt% aluminum phosphate, 12.9wt% silicon dioxide, 1.5wt% alundum (Al, 1.2wt% titanium dioxide, and 70wt% water.Solid constituent with antioxidant is calculated, and aluminum phosphate content is 48wt%, and dioxide-containing silica is 43wt%, and alundum (Al content is 5wt%, and content of titanium dioxide is 4wt%.
Embodiment 12:
This antioxidant ingredients comprises the 14.4wt% aluminum phosphate, 12.9wt% silicon dioxide, 1.5wt% alundum (Al, 1.2wt% zirconium dioxide, and 70wt% water.Solid constituent with antioxidant is calculated, and aluminum phosphate content is 48wt%, and dioxide-containing silica is 12.9wt%, and alundum (Al content is 5wt%, and zirconium dioxide content is 4wt%.
By referring to Fig. 6, more demonstrating graphite electrode floods behind the liquid antioxidant of the present invention under 1100 ℃～1400 ℃ temperature conditions, its oxygenation efficiency shows thus that less than the graphite electrode that does not use this antioxidant liquid antioxidant of the present invention has good antioxygenic property.
Certainly, those skilled in the art in the present technique field will be appreciated that, the foregoing description only is to be used for illustrating the present invention, and be not as limitation of the invention, as long as in connotation scope of the present invention, all will drop in the scope of claim of the present invention conversion, the modification of the foregoing description.
Claims (2)
1. dipping type anti-oxidant that improves graphite electrode performance of electric arc steelmaking, adopt liquid antioxidant to be coated in graphite electrode surface or be impregnated in the minute aperture of graphite, allow after the water evaporates, form the oxidation-resistant ceramic film at graphite electrode surface and graphite electrode minute aperture inner surface, it is characterized in that, contain the solid constituent aluminum phosphate in the described liquid antioxidant, silicon dioxide and aluminium oxide and the aqueous solution, its particle diameter of described solid constituent is that the oxide particle of 0.01～1 μ m stably is dispersed in the heterogeneous suspension liquid of formation in the aqueous solution, weight 100% by solid constituent is calculated, wherein aluminum phosphate is 40wt%～64wt%, silicon dioxide 30wt%～57wt%, alundum (Al 1wt%～6wt%, the heat resisting temperature of formed oxidation-resistant ceramic film reach 1400 ℃.
2. the dipping type anti-oxidant of raising graphite electrode performance of electric arc steelmaking according to claim 1, it is characterized in that, also contain solid constituent titanium dioxide 0.1wt%～3wt%, diboron trioxide 0.5wt%～3wt% and zirconium dioxide 0.1wt%～1wt% in the described liquid antioxidant.
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| CN108456005A (en) * | 2018-04-20 | 2018-08-28 | 郑州大学 | Graphite antioxidant coating and preparation method thereof |
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| CN105958005A (en) * | 2016-06-24 | 2016-09-21 | 苏州华冲精密机械有限公司 | Electrode for saving energy and reducing consumption |
| CN108064097A (en) * | 2017-12-05 | 2018-05-22 | 攀枝花钢城集团瑞钢工业有限公司 | For the electrode and its spraying method of electric-arc furnace steelmaking |
| CN108456005A (en) * | 2018-04-20 | 2018-08-28 | 郑州大学 | Graphite antioxidant coating and preparation method thereof |
| CN108456005B (en) * | 2018-04-20 | 2021-04-27 | 郑州大学 | Graphite oxidation resistant coating |
| CN108752049A (en) * | 2018-07-19 | 2018-11-06 | 成都百里恒新材料有限公司 | A kind of carbon product impregnating protective agent and preparation method thereof |
| 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 |
| CN110423141A (en) * | 2019-08-12 | 2019-11-08 | 广东省材料与加工研究所 | Promote processing method, graphite jig and the application of the anti-cyclic oxidation of graphite jig |
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| CN110526742A (en) * | 2019-09-04 | 2019-12-03 | 鞍钢股份有限公司 | A kind of maceration extract improving LF graphite electrode service life |
| CN112063798A (en) * | 2020-09-16 | 2020-12-11 | 攀钢集团研究院有限公司 | Method for reducing electrode consumption of electric furnace |
| CN112063798B (en) * | 2020-09-16 | 2022-03-22 | 攀钢集团研究院有限公司 | Method for reducing electrode consumption of electric furnace |
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