CN101481257A - Ladle slag line gunning refractory - Google Patents
Ladle slag line gunning refractory Download PDFInfo
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- CN101481257A CN101481257A CNA2009101031788A CN200910103178A CN101481257A CN 101481257 A CN101481257 A CN 101481257A CN A2009101031788 A CNA2009101031788 A CN A2009101031788A CN 200910103178 A CN200910103178 A CN 200910103178A CN 101481257 A CN101481257 A CN 101481257A
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- gunning refractory
- slag line
- ladle slag
- gunning
- magnesium
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Abstract
The invention discloses a ladle slag line gunning refractory. The gunning refractory comprises main material, a binding agent and a B2O3 additive; the main material is consistent with the gunned body and is a magnesium and/or magnesium-calcium basic material, and the chemical components thereof are MgO, CaO and SiO2; the critical particle size of the components is less than or equal to 3mm, wherein, the particle size distribution is as follows: coarse particles: intermediate particles: fine powder=(4.2-5.8):(1.5-2.8):(2.4-3.9); the binding agent is a composite binding agent of phosphate and silicate of random proportions; and the gunning refractory comprises 85-95% of the magnesium main material and the magnesium-calcium main material, 1-10% of the binding agent and 0.1-5% of the B2O3 additive. The ladle slag line gunning refractory has the advantages of easy transportation, good wettability, high adhesive rate, suitable curing characteristic and good durability, thus being capable of prolonging the use by 3-5 times by once gunning, improving the service life of the ladle slag line by more than 10 times on average, improving the sintering characteristic of the ladle slag line gunning refractory, improving anti-corrosion capacity and anti-stripping capacity of the gunning refractory, and prolonging the service life of ladle slag line magnesia carbon bricks.
Description
Technical field
The present invention relates to the hot patching material after a kind of magnesia, magnesia carbon refractory furnace lining is etched, the ladle slag line gunning refractory after especially being etched at the ladle slag line position.
Background technology
In recent years, because smelt the needs of Clean Steel, the application of various molten steel refining technologies is promoted rapidly, the ladle working conditions worsens day by day, ladle liner is very outstanding with the phenomenon of refractory corrosion inequality, and particularly the influence of the life-span of ladle slag line position magnesia carbon brick is the most serious.Become one of the principal element in each big steel enterprise ladle bag of restriction age the work-ing life of ladle slag line magnesia carbon brick, particularly the influence of LF refining ladle is even more serious.After the ladle slag line position is etched or part corrodes, by being etched position spray repair patching material,, just can reuse after being etched the position and carrying out hot patching; If the patching material of choosing is suitable, every spray repair once can prolong and use 3～5 times.Average energy improves the ladle slag line life-span more than 10 times, significantly reduces its use cost.Construction technology is simple, cost is low because of having for the hot gunning technology of ladle slag line, with strong points, characteristics such as maintenance speed is fast, safeguards novel process as a kind of ladle, is now adopted by numerous producers.Be not easy sintering after the ladle slag line gunning refractory spray repair in the past, peel off easily, cause work-ing life lower, do not reach well after taking spray repair to safeguard and produce effects.
Summary of the invention
The present invention is directed to the above-mentioned deficiency of the ladle slag line gunning refractory of prior art, provide a kind of adhesive rate height, curing characteristics is suitable, wearing quality good, can improve the sintering character of ladle Gunning refractory, the ladle slag line gunning refractory in the use that improves the ladle slag line magnesia carbon brick, significant prolongation ladle slag line work-ing life.
Technical scheme of the present invention: ladle slag line gunning refractory, its component comprises material of main part, wedding agent and B2O3 additive, material of main part is with consistent by spray repair body material, be the magnesia and/or calcareous basic material of magnesium, main chemical composition comprises MgO, CaO, SiO2, wherein the content of MgO is between 50～99%, and the content of CaO is between 0.5～48%, and the content of SiO2 is between 0.10～5.0%; The critical granularity of component is 3mm (being less than or equal to 3mm), and size-grade distribution wherein is a coarse particles: middle particle: fine powder=(4.2～5.8): (1.5～2.8): (2.4～3.9); Wedding agent is the phosphoric acid salt and the silicate combined binder of arbitrary proportion;
The weight proportion scope of material of main part, wedding agent and B2O3 additive is: the calcareous material of main part 85～95% of magnesia, magnesium, and wedding agent: 1～10%, B
2O
3Additive: 0.1～5%.
Ladle slag line gunning refractory of the present invention with respect to prior art, has following characteristics:
1, the part B in the Gunning refractory
2O
3Enter in the slag, with the α-C in the slag
2S forms sosoloid, has suppressed α-C
2S is to γ-C
2The transformation of S prevents the magnesia carbon brick damage that causes because of the slag efflorescence; Form the dross protective layer easily on the Gunning refractory surface, can effectively prevent the oxidation of magnesia carbon brick, improve the ability of the anti-LF efflorescence of slag line magnesia carbon brick scouring.
2, ladle slag line gunning refractory of the present invention is easily carried, wettability is good, adhesive rate is high, curing characteristics is suitable, wearing quality is good, and spray repair once can prolong to be used 3～5 times, safeguards by spray repair, on average can improve the ladle slag line life-span more than 10 times.
3, add B
2O
3Additive can improve the sintering character of ladle Gunning refractory, improves the anti-erosion and the antistripping ability of Gunning refractory, improves the work-ing life of ladle slag line magnesia carbon brick.
Embodiment
Ladle slag line gunning refractory of the present invention, its component comprises material of main part, wedding agent and B
2O
3Additive, material of main part are the magnesia and/or calcareous basic material of magnesium magnesium with consistent by spray repair body material, and chemical composition comprises MgO, CaO, SiO
2The critical granularity of component is 3mm (being less than or equal to 3mm), and size-grade distribution wherein is a coarse particles: middle particle: fine powder=(4.2～5.8): (1.5～2.8): (2.4～3.9); Wedding agent is the phosphoric acid salt and the silicate combined binder of arbitrary proportion;
Material of main part, wedding agent and B
2O
3The weight proportion scope of additive is: the calcareous material of main part 85～95% of magnesia, magnesium, and wedding agent: 1～10%, B
2O
3Additive: 0.1～5%.This paper provides following several concrete proportioning: material of main part 88%, and wedding agent: 8%, B
2O
3Additive: 4%; Material of main part 90%, wedding agent: 7%, B
2O
3Additive: 3%; Material of main part 92.5%, wedding agent: 5.5%, B
2O
3Additive: 2%; Material of main part 94%, wedding agent: 5%, B
2O
3Additive: 1%; Material of main part 95%, wedding agent: 3.5%, B
2O
3Additive: 1.5%.
Because the anti-erosional competency of magnesia raw material is strong and can absorb slag and react, makes its sintering temperature reduce, improve cohesiveness, improve intensity.Simultaneously, consider slag penetration resistance and basicity of slag in the Gunning refractory use, and CaO/SiO in the high CaO content magnesium material
2Than improving, can form high melting compound, the melting loss speed of slag can be reduced, and, SiO in the slag can be stoped from working face crystallization more nearby
2The infiltration of composition.Consider that ladle slag line adopts magnesia carbon brick to build by laying bricks or stones, according to the Gunning refractory material must with by the consistent principle of spray repair body material, therefore, the material of main part raw material select for use magnesia and/or the calcareous basic material of magnesium as main raw material(s), the main chemical composition of material of main part comprises MgO, CaO, SiO
2, all the other are moisture and rational impurity.No matter what adopt is the calcareous basic material of magnesian or magnesium, wherein the content of MgO between 50～99%, the content of CaO between 0.5～48%, SiO
2Content between 0.10～5.0%.A kind of concrete composition of magnesia material of main part: MgO is 95.24%, CaO is 0.87%, SiO
2Be 0.68%, its moisture is less than 0.5%, and all the other are impurity, and volume density is greater than 3.20%.A kind of concrete composition of the calcareous material of main part of magnesium: MgO is 68.98%, CaO is 26.87%, SiO
2Be 1.75%, its moisture is less than 0.5%, and all the other are impurity, and volume density is greater than 3.20%.
The size composition of the component of Gunning refractory all has a significant impact tack and wearing quality.Fine granularity can be improved adhesion property, good, the Gunning refractory adhesive rate height of plasticity-, but the spray repair hourly water consumption is low than ambassador's material volume density, void content is high, antistripping difference and erosion resistance are bad; Coarse particles can make that the spray repair layer is stable, Gunning refractory density height, wearing quality are good, but coarse particles spray gun is stifled easily when too much, rebound degree is high, loss is big, influences spray repair efficient when serious, result of use is also undesirable.
For making Gunning refractory have rational size composition, higher adhesive rate and good wearing quality when guaranteeing spray repair, we adopt identical raw material, wedding agent and additive, and the Gunning refractory that different grain size is formed is tested.By test relatively, and according to on-the-spot actually operating situation, determine that the Gunning refractory critical granularity is 3mm, particle size distribution is a coarse particles: middle particle: fine powder=(4.2～5.8): (1.5～2.8): (2.4～3.9); The optimum size distribution range is a coarse particles: middle particle: fine powder=5:2:3.
Wedding agent all has a significant impact tack, workability and the wearing quality of Gunning refractory.Must consider dispersiveness, instantly-soluble, construction property when selecting the Gunning refractory wedding agent and to the influence of performance Gunning refractory wearing qualities such as Gunning refractory viscosity and intensity, guarantee that in whole temperature range Gunning refractory has enough intensity and reduces wedding agent to greatest extent to the influence of spray repair use properties etc.Gunning refractory generally is divided into phosphorus system (phosphoric acid salt mostly is composite phosphate) and non-phosphorus system (silicate and pure calcium aluminate cement, micro mist etc. are arranged) with wedding agent.Wherein, to adopt quick dissolved sodium silicate in conjunction with Gunning refractory be that (modulus of water glass is SiO to wedding agent to silicate more
2/ Na
2O 2.7), the adhesion property at this Gunning refractory spray repair initial stage is good, but 800 ℃～1000 ℃ medium temperature intensity is low, and strength degradation during high temperature, resistance to fouling is poor, wearing quality is bad.Make silicate with CaO and MgO reaction not generate low-melting CaOMgOSiO if will improve the content that the erosion resistance of Gunning refractory must be controlled CaO in the raw material this moment
2, improve the temperature of fusion of Gunning refractory, and then improve its use properties.When adopting phosphoric acid salt to be wedding agent, Gunning refractory heat-treated Temperature Influence is bigger, and drying property is poor, be prone to be full of cracks and burst phenomenon, often occurs the spot shape in the use and peels off.For reducing with phosphoric acid salt is wedding agent Gunning refractory peeling off in use, should select high CaO/SiO
2The magnesia of ratio. make sodium phosphate and CaO reaction generate dystectic Na
2O2CaOP
2O
5Deng mineral, thereby make between Gunning refractory and the mother metal because high-melting-point mineral " bridgings " form directly and combine, when improving the Gunning refractory spalling resistance, raising adhesive rate and wearing quality.Concrete wedding agent is chosen the phosphoric acid salt and the silicate combined binder of arbitrary proportion.
When concrete operations, can be equipped with the supplementary additive (comprise setting accelerator, sintering aid and antiknock split agent etc.) of prior art, this Gunning refractory setting time is suitable, and has good coking property and adhesivity etc.
Erosion condition according to ladle slag line, needs are carried out the position of spray repair and will take even spray repair, frequent mobile spray gun is adjusted the spray repair position, keeps smooth smooth by the spray repair position, and suitably enlarge the spray repair scope, guarantee the sintering character of Gunning refractory and ladle slag line brick parent.The place of dell or disconnected brick is appearred in the part, adopt closely once spray flat.The hot spray repair of ladle is in line with all mending, mend soon, approaching the principle of mending, and the inhomogeneous or blocked up Gunning refractory that all can cause of spray repair comes off, and increases loss per ton steel.The spray repair gauge control is in 50mm.Ladle slag line materials of every spray repair amount is about 120Kg, has carried out test altogether and follow the tracks of on 20 ladles, and each ladle takes spray repair to safeguard that the optimum test scheme can make the ladle slag line magnesia carbon brick on average improve more than 10 times work-ing life more than 3 times at least.
After ladle is filled molten steel, a spot of B
2O
3Enter in the slag, according to " boron abnormal phenomena ", B
2O
3Content more after a little while, the boron ion is in [BO
4] the tetrahedron state; make slag structure tight; viscosity raises; form the viscosity slag protective layer of one deck densification at slag line magnesia carbon brick Decarburized layer working face; hinder the Mg steam of consumable reaction generation in the magnesia carbon brick and the effusion of CO gas; cause the beginning temperature of MgO and carbon reaction to raise, thus the carrying out of slowing down or stoping consumable reaction in the magnesia carbon brick.B in the Gunning refractory
2O
3Part enters in the slag, with the Q-C in the slag
2S forms sosoloid, has suppressed α-C
2S is to γ-C
2The transformation of S prevents the magnesia carbon brick damage that causes because of the slag efflorescence; Form the dross protective layer easily on the Gunning refractory surface, can effectively prevent the oxidation of magnesia carbon brick, improve the ability of the anti-LF efflorescence of slag line magnesia carbon brick scouring.
When concrete spray repair was operated, the selection control of water consumption and blast was very big to the adhesivity influence.The too small meeting of the water yield causes " being fuming " phenomenon, Gunning refractory be subjected to spray plane because of the water yield is little can't be wetting, elastic collision takes place, material can't adhere to; The water yield is excessive, and the Gunning refractory trickling is serious, also can't adhere to.The water yield should reduce consumption as far as possible during spray repair under the prerequisite that guarantees adhesive rate, in order to avoid influence the use properties of Gunning refractory.High-pressure blast is a carrier of carrying Gunning refractory during the spray repair operation, and blast is crossed conference and caused material abundant inadequately, wetting undesirable in mixing of muzzle place with water, and excessive with the liner elastic collision, and tack is poor; When blast is not enough, Gunning refractory be subjected to contacting of spray plane insufficient, adhesive rate is also undesirable.In addition, the required spray repair thickness of ladle liner needs through repeatedly spray repair operation, the thickness of each spray repair can not be blocked up, this not only helps the sintering of Gunning refractory, also make the spray plane that is subjected to that becomes the operation of spray repair once more at first attached to the Gunning refractory on the ladle liner, rebound degree when having reduced spray repair, adhesive rate improves.
Gunning refractory of the present invention is except can be good at being applied to the ladle slag line spray repair safeguards, the hot spray repair that also can be applied to all Industrial Stoves that uses is magnesia, magnesia carbon refractory is built by laying bricks or stones simultaneously safeguards, raising furnace lining work-ing life.As: the spray repair of furnace linings such as steel-making converter, electric furnace is safeguarded.
Claims (2)
1, ladle slag line gunning refractory is characterized in that: component comprises material of main part, wedding agent and B
2O
3Additive, material of main part are magnesia and/or the calcareous basic material of magnesium, and chemical composition comprises MgO, CaO, SiO
2Wherein the content of MgO is between 50～99%, the content of CaO between 0.5～48%, SiO
2Content between 0.10～5.0%;
The granularity of component is less than or equal to 3mm, and particle size distribution wherein is a coarse particles: middle particle: fine powder=(4.2～5.8): (1.5～2.8): (2.4～3.9);
Wedding agent is the phosphoric acid salt and the silicate combined binder of arbitrary proportion;
The weight proportion scope of material of main part, wedding agent and B2O3 additive is: material of main part 85～95%, and wedding agent: 1～10%, B
2O
3Additive: 0.1～5%.
2, ladle slag line gunning refractory according to claim 1 is characterized in that: the particle size distribution of described component is a coarse particles: middle particle: fine powder=5:2:3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101031788A CN101481257B (en) | 2009-02-12 | 2009-02-12 | Ladle slag line gunning refractory |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101031788A CN101481257B (en) | 2009-02-12 | 2009-02-12 | Ladle slag line gunning refractory |
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| Publication Number | Publication Date |
|---|---|
| CN101481257A true CN101481257A (en) | 2009-07-15 |
| CN101481257B CN101481257B (en) | 2012-08-22 |
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ID=40878573
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009101031788A Active CN101481257B (en) | 2009-02-12 | 2009-02-12 | Ladle slag line gunning refractory |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102168161A (en) * | 2011-04-12 | 2011-08-31 | 马鞍山钢铁股份有限公司 | Method for filling gap between bricks and lining of tapping hole of converter |
| CN102372487A (en) * | 2010-08-25 | 2012-03-14 | 宝山钢铁股份有限公司 | Magnesium-carbon gunning mix |
| CN103979990A (en) * | 2014-05-29 | 2014-08-13 | 张婷 | Small ladle gunning mix |
| CN104003739A (en) * | 2014-05-29 | 2014-08-27 | 张婷 | 50-ton steel ladle gunning mix |
| CN108675805A (en) * | 2018-06-14 | 2018-10-19 | 玉和建设有限公司 | A kind of mixed binding fire-resistant abrasion-proof is moldable |
| CN116375485A (en) * | 2023-03-22 | 2023-07-04 | 中钢洛耐科技股份有限公司 | Aluminate cement combined unshaped refractory repair material and preparation method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1239429C (en) * | 2003-02-28 | 2006-02-01 | 上海汇集新材料股份有限公司 | Gunning refractory of converter tap hole |
-
2009
- 2009-02-12 CN CN2009101031788A patent/CN101481257B/en active Active
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102372487A (en) * | 2010-08-25 | 2012-03-14 | 宝山钢铁股份有限公司 | Magnesium-carbon gunning mix |
| CN102168161A (en) * | 2011-04-12 | 2011-08-31 | 马鞍山钢铁股份有限公司 | Method for filling gap between bricks and lining of tapping hole of converter |
| CN102168161B (en) * | 2011-04-12 | 2013-01-09 | 马鞍山钢铁股份有限公司 | Method for filling gap between bricks and lining of tapping hole of converter |
| CN103979990A (en) * | 2014-05-29 | 2014-08-13 | 张婷 | Small ladle gunning mix |
| CN104003739A (en) * | 2014-05-29 | 2014-08-27 | 张婷 | 50-ton steel ladle gunning mix |
| CN103979990B (en) * | 2014-05-29 | 2016-08-24 | 南通纺都置业有限公司 | A kind of little ladle gunning refractory |
| CN104003739B (en) * | 2014-05-29 | 2016-08-24 | 南通纺都置业有限公司 | A kind of 50 tons of ladle gunning refractories |
| CN108675805A (en) * | 2018-06-14 | 2018-10-19 | 玉和建设有限公司 | A kind of mixed binding fire-resistant abrasion-proof is moldable |
| CN116375485A (en) * | 2023-03-22 | 2023-07-04 | 中钢洛耐科技股份有限公司 | Aluminate cement combined unshaped refractory repair material and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101481257B (en) | 2012-08-22 |
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