CN101284736A - Antisticking coating mixture for steel-smelting and preparation method threreof - Google Patents
Antisticking coating mixture for steel-smelting and preparation method threreof Download PDFInfo
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- CN101284736A CN101284736A CNA2008100376300A CN200810037630A CN101284736A CN 101284736 A CN101284736 A CN 101284736A CN A2008100376300 A CNA2008100376300 A CN A2008100376300A CN 200810037630 A CN200810037630 A CN 200810037630A CN 101284736 A CN101284736 A CN 101284736A
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Abstract
The invention relates to an anti-sticking daubing material applied in steelmaking as well as the preparation method thereof, and is characterized in that the daubing material is composed of the following components by weight percentages as follows: 65 to 80 percent of 0 to 3 mm waste magnesia-carbon brick powder, 10 to 30 percent of waste magnesia-carbon brick powder, 5 to 30 percent of fused magnesia powder, 1 to 4 percent of fine silica powder, 1 to 4 percent of fine Alpha-Al2O3 powder, 0.1 to 1 percent of sodium hexameta phosphate, 0.1 to 0.8 percent of calcium lignosulfonat and 1 to 5 percent of soft clay. The daubing material can prevent the penetration of molten slag by utilizing the lubricating property of graphite in the waste magnesia-carbon bricks, and the slag is not easy to be hung on the surface, thereby not only effectively utilizing the waste magnesia-carbon bricks, but also prolonging the service life and reducing the cost.
Description
Technical field
The present invention relates to a kind of steel-making with antiseized coating and preparation method thereof.Be mainly used in the lining surface coating of steel-making such as RH refining furnace, LF refining furnace with the elevated temperature heat construction equipment.Belong to the amorphous refractory category.
Background technology
Fire-resistant coating is one of important kind in the amorphous refractory, early uses in China, for the more than ten years are developed a kind of faster material recently.On kiln and Thermal Equipment, such material can be used for smearing new lining body, also can be used for having used the coating of lining body, or is used to repair bricking local damage place, to protect former lining body., economic benefit simple because of its construction well is used widely.
At present, this series products mainly with magnesia corundum matter, siliceous be raw material, of a great variety.But in actual use, fire-resistant coating is damaged serious, causes duration of service shorter, and generally be lower than 10h the work-ing life of coating, thereby one ton of every production refractory materials amount that steel consumed is increased, and has increased cost to a certain extent.
Research and development can improve fire-resistant coating self work-ing life, serve as a contrast the body problem in work-ing life thereby improve, and have become the direction that fire-resistant industry worker makes great efforts the merit pass.
Summary of the invention
Technical problem to be solved by this invention is: provide a kind of steel-making with antiseized coating and preparation method thereof.Discarded magnesia carbon brick is developed and utilized the refractory materials resource of saves valuable.Product significantly improves the work-ing life of coating work-ing life more than 10h, reach the purpose of the former lining body of effective protection.
The technical scheme that provides for technical problem to be solved is:
1, the selection of raw material:
The waste magnesia carbon brick particulate material that with the granularity is 0-3mm is as aggregate.The mass percent (wt%) of discarded each component of magnesia carbon brick sand particle should meet the following conditions: MgO 〉=80%, C 〉=12%.Volume density 〉=3.20g/cm
3
Fineness＜0.088mm that the waste magnesia carbon brick powder requires, the mass percent of each component is: C 〉=14.00%, MgO 〉=78%
The electric molten magnesite powder requires the massfraction (wt%) of its each component to meet the following conditions: MgO 〉=97.00%, CaO≤1.50%, SiO
2≤ 1.0%, igloss≤0.3%.
Soft clay requires the mass percent (wt%) of its each component SiO that should meet the following conditions
2〉=50.00%, Al
2O
3〉=30.00%, Fe
2O
3≤ 1.50%,, igloss≤10.0%.Refractoriness 〉=1730 ℃.
Fine silica powder, α-Al
2O
3Purity 〉=95% of raw materials such as micro mist, Sodium hexametaphosphate 99, calcium lignin sulphonate.
2, steel-making provided by the invention with the mass percent of the concrete raw material of antiseized coating composition is:
Waste magnesia carbon brick sand aggregate 0-3mm 65-80%
Waste magnesia carbon brick powder＜0.088mm 10-30%
Electric molten magnesite powder＜0.088mm 5-30%
Fine silica powder≤45 μ m 1-4%
α-Al
2O
3Micro mist≤45 μ m 1-4%
Sodium hexametaphosphate 99 0.1-1%
Calcium lignin sulphonate 0.1-0.8%
Soft clay 1-5%
3, steel-making provided by the invention is the mass percent 65%-80% of aggregate with the grain composition of antiseized coating, powder 35%-20%.
4, steel-making provided by the invention with the concrete preparation technology of antiseized coating is:
Discarded magnesia carbon brick is rejected useless brick alterated layer through the artificial hand selection.Use the jaw crushing crusher machine, drum roller rolls, to eliminate false particle.Through multilayer translational vibration screen sizing, obtain main raw material again.Carry out the proportioning weighing by the combination that is provided then.At first the fine powder class is put into mixer and carry out pre-mixing 10---15min, add 0-3mm waste magnesia carbon brick sand particulate material stirring and evenly mixing.Always the time of mixing is 20---discharging after the 25min, inspection by sampling, weighing, packing, warehouse-in.
By above technical scheme as can be seen: steel-making provided by the invention with the characteristics of antiseized coating is: (1), in a large number uses discarded magnesia carbon brick to be raw material, usage quantity accounts for ingredients by weight per-cent can be up to 80%, the saving cost.(2), make full use of in the reclaimed materials graphite and have excellent lubrication and resistance to fouling and the heat characteristics such as stability of shaking, make coating in the high temperature environment for use, can stop the intrusion of slag liquid effectively, make the coating surface be difficult for dross, play the effect of anti-dry slag.(3), introduce oxide micropowder SiO
2And α-Al
2O
3During construction, under calcium lignin sulphonate and compound dissemination Sodium hexametaphosphate 99, effectively fill the space, reduce the water consumption when mixing, play the effect that improves volume density and significantly reduce void content, improve intensity, enhancing solidity to corrosion and the wear resistance of product with this.The adding of micro mist, the while has also increased the flowability of coating, helps improving the workability of product.When high temperature used, micro mist formed ceramic combination because of it is easy to sintering, and its intensity improves gradually with the raising of thermal treatment temp.The adding of micro mist can strengthen reactivity and the coking property between coating.SiO
2With the periclasite reaction, form forsterite.The high-temperature flame-proof of forsterite, slag resistance and hard-to-sinter are the densification process that prolongs coating, and the sintering successively of coating and greater than having created good condition the work-ing life of 10h.(4), the compound use of wedding agent soft clay and Sodium hexametaphosphate 99, give the workability of product fine, can improve the sticking power of product, can guarantee again product in, low temperature intensity.
In a word, the present invention is a main raw material with the discarded magnesia carbon brick of steel mill, uses suitable batching to form, and improves the use properties of fire-resistant coating, protects RH refining furnace, LF refining furnace and other steel-making furnace lining with Thermal Equipment effectively, the work-ing life of improving furnace lining.Particularly utilize the lubricating property of graphite in the waste magnesia carbon brick, stop slag penetration, make the surface of fire-resistant coating be difficult for dross, thereby prolong the work-ing life of coating.Resource has been saved in the utilization of discarded magnesia carbon brick, has reduced cost, has produced good economic benefit and social benefit.Characteristics such as the present invention has that production technique is simple, product performance are good, intensity is high, wear-resistant, anti-dry slag, system's save energy, day output are big have good practical and popularizing value (seeing embodiment 3 for details).
Embodiment
Further illustrate substantive distinguishing features of the present invention and obvious improvement below by specific embodiment.
Embodiment 1
Provide steel-making with the quality percentage composition of antiseized coating main chemical compositions to be: MgO 74.80%, Al
2O
33.11%, CaO 2.13%, and C 10.98%, SiO
23.45%, Fe
2O
31.26%.
The concrete proportioning (weight percent) of each raw material is: granularity is the useless magnesium carbon granule 75% of 0-3mm, useless magnesium carbon dust 10%, electric molten magnesite powder 6%, silicon powder 3.5%, α-Al
2O
32.0%, Sodium hexametaphosphate 99 0.6%, calcium lignin sulphonate 0.4%, soft clay 2.5%.
By above weight percent weighing, earlier the fine powder class is put into mixer and carry out pre-mixing 10min, add 0-3mm particulate material stirring and evenly mixing again.Always the time of mixing is discharging after the 20min, inspection by sampling, weighing and bagging.Standby.
Embodiment 2
Provide steel-making with the quality percentage composition of antiseized coating main chemical compositions to be: MgO 79.16%, Al
2O
33.77%, CaO 1.63%, and C 9.08%, SiO
23.85%, Fe
2O
31.69%.
The concrete proportioning (weight percent) of each raw material is: granularity is the useless magnesium carbon granule 70% of 0-3mm, useless magnesium carbon dust 8%, electric molten magnesite powder 12%, silicon powder 3.0%, α-Al
2O
33.0%, Sodium hexametaphosphate 99 0.6%, calcium lignin sulphonate 0.4%, soft clay 3.0%
By above weight percent weighing, earlier the fine powder class is put into mixer and carry out pre-mixing 10min, add 0-3mm particulate material stirring and evenly mixing again.Always the time of mixing is discharging after the 20min, inspection by sampling, weighing and bagging.Standby.
Embodiment 3
Performance, application and the economic efficiency contrast of coating provided by the invention and original coating that uses:
1, performance comparison
The steel-making of getting embodiment 1 production is an amount of with antiseized coating, adds suitable quantity of water and stirs, and three gang moulds and the endoporus that take shape in 160 * 40 * 40mm are of a size of in the crucible die of φ 25mm * 40mm, normal temperature is placed 24h, the demoulding, 110 ℃ of baking 24h detect the oven dry performance index.Put into the 30g slag charge in crucible, carry out the thermal treatment of 1500 ℃ of φ * 3h in High Temperature Furnaces Heating Apparatus, naturally cooling detects the slagging of retractory degree of depth.Anti-slag test is to climb steel steel-making finishing slag with slag, and embodiment 2 and comparative example forming method are with embodiment 1.Comparative example is original product.Detect index such as following table:
2, use
(1) produce steel-making with 2 tons of antiseized coatings according to embodiment 1, on probation on January 3rd, 2007 in the tubular stinger coating of certain RH of steel mill refining furnace.Working hour is 10 hours 12 minutes, and disintegration is good, and workability is good.
(2) produce steel-making with 2 tons of antiseized coatings according to embodiment 2, smear on probation at certain LF of steel mill refining furnace bell on January 18th, 2007.Working hour is 10 hours 32 minutes, and disintegration is good, and workability is good.
(3) comparative example is original product, uses under identical environment for use with embodiment 1, and the working hour only is 8 hours 45 minutes.Use under identical environment for use with embodiment 2, the working hour only is 7 hours 15 minutes.
By practical probation, reached expected effect of the present invention.
3, economic benefit
About 1180 yuan/ton of the recovery tooling cost of the main raw material waste magnesia carbon brick of this product, about 1820 yuan/ton of the main raw material electrosmelted magnesite clinker per ton cost of other similar coating.Product per ton only one of main raw material with regard to cost-saved 640 yuan.Economic benefit is considerable, has good application prospects.
Claims (10)
1, the antiseized coating of a kind of steel-making is characterized in that the mass percent of described coating is:
Waste magnesia carbon brick sandpipe material 0-3mm 65-80%
Waste magnesia carbon brick powder＜0.088mm 10-30%
Electric molten magnesite powder＜0.088mm 5-30%
Fine silica powder 1-4%
α-Al
2O
3Micro mist 1-4%
Sodium hexametaphosphate 99 0.1-1%
Calcium lignin sulphonate 0.1-0.8%
Soft clay 1-5%.
2,, it is characterized in that forming mass percent as the waste magnesia carbon brick sand of aggregate is MgO 〉=80%, C 〉=12%, volume density 〉=3.20g/cm by the antiseized coating of the described steel-making of claim 1
3
3, by the antiseized coating of the described steel-making of claim 1, the composition mass percent that it is characterized in that described waste magnesia carbon brick powder is C 〉=14%, MgO 〉=78%.
4,, it is characterized in that each mass percent of forming of described electric molten magnesite powder is MgO 〉=97%, CaO 〉=1.5%, SiO by the antiseized coating of the described steel-making of claim 1
2≤ 1.0%.
5,, it is characterized in that the mass percent that described soft clay is formed is SiO by the antiseized coating of the described steel-making of claim 1
2〉=50%, Al
2O
3〉=30%, Fe
2O
3≤ 1.5%.
6, by the antiseized coating of the described steel-making of claim 1, the grain composition that it is characterized in that coating is that the mass percent of aggregate is 65～80%, and powder quality per-cent is 35～20%.
7, by the antiseized coating of the described steel-making of claim 1, it is characterized in that fine silica powder and α-Al
2O
3Grain size of micropowder is≤45 μ m; Purity 〉=95%.
8, preparation is characterized in that by the method for the described steel-making of claim 1 with antiseized coating:
(1) discarded magnesia carbon brick is made through artificial hand, rejects useless brick alterated layer;
(2) roll with a formula crusher in crushing, drum roller, through multilayer translational vibration screen sizing, obtain the waste magnesia carbon brick main raw material again;
(3) then, form weighing by the proportioning in the claim 1;
(4) will form in fine powder put into mixer pre-mixing 10～15min, the waste magnesia carbon brick sand that adds 0～3mm again stirs, and always mixes 20～25 minutes time, mix the back discharging.
9, by the described steel-making of claim 8 with the preparation method of antiseized coating, it is characterized in that in the mixer that it is 10 minutes that fine powder is done time in advance, always the time of mixing is 20 minutes.
10, by the application of the described steel-making of claim 1, it is characterized in that being used for RH refining furnace or LF refining furnace furnace lining with antiseized coating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100376300A CN101284736A (en) | 2008-05-20 | 2008-05-20 | Antisticking coating mixture for steel-smelting and preparation method threreof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100376300A CN101284736A (en) | 2008-05-20 | 2008-05-20 | Antisticking coating mixture for steel-smelting and preparation method threreof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101284736A true CN101284736A (en) | 2008-10-15 |
Family
ID=40057180
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008100376300A Pending CN101284736A (en) | 2008-05-20 | 2008-05-20 | Antisticking coating mixture for steel-smelting and preparation method threreof |
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| CN101863671A (en) * | 2010-05-07 | 2010-10-20 | 武汉钢铁(集团)公司 | Slag adhesion resistant gunning refractory for converter |
| CN102515797A (en) * | 2011-12-08 | 2012-06-27 | 山西高科耐火材料股份有限公司 | Low-cost magnesium gunning material and its preparation method |
| CN102674850A (en) * | 2012-04-16 | 2012-09-19 | 莱芜钢铁集团有限公司 | Magnesium-carbon coating used for fixing weirs and dams of tundish of continuous caster and construction method of magnesium-carbon coating |
| CN102674862A (en) * | 2012-05-25 | 2012-09-19 | 无锡市南方耐材有限公司 | High-temperature antioxidation antifriction lubricant and preparation method thereof |
| CN102815956A (en) * | 2012-08-29 | 2012-12-12 | 江苏恒耐炉料集团有限公司 | Wear-resistant coating mixture for waste heat power generation pipelines |
| CN102965474A (en) * | 2012-11-22 | 2013-03-13 | 河南省西保冶材集团有限公司 | Anti-slag agent for high temperature VD (Vaccum Distillation) furnace |
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| CN101863671A (en) * | 2010-05-07 | 2010-10-20 | 武汉钢铁(集团)公司 | Slag adhesion resistant gunning refractory for converter |
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| CN110642611A (en) * | 2019-10-11 | 2020-01-03 | 鄂尔多斯市瀚博科技有限公司 | Refractory ramming mass for iron ladle of ferrosilicon electric furnace and preparation method thereof |
| CN112358269A (en) * | 2020-11-20 | 2021-02-12 | 攀枝花钢城集团有限公司 | Anti-sticking agent for improving slag pot turnover rate and preparation method thereof |
| CN113912403A (en) * | 2021-09-06 | 2022-01-11 | 海城利尔麦格西塔材料有限公司 | Low-cost grouting material for back of cooling wall of blast furnace |
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