CN103373854B - A kind of Large face repair material of converter and preparation method thereof - Google Patents
A kind of Large face repair material of converter and preparation method thereof Download PDFInfo
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- CN103373854B CN103373854B CN201210117259.5A CN201210117259A CN103373854B CN 103373854 B CN103373854 B CN 103373854B CN 201210117259 A CN201210117259 A CN 201210117259A CN 103373854 B CN103373854 B CN 103373854B
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- alumina brick
- magnesia alumina
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Abstract
The invention discloses a kind of repair material for smelting molten steel stove, particularly a kind of repair material for converter working lining and preparation method thereof.The technical problem that existing converter working lining repair material cost is high, resistance to fouling is low.Technical scheme of the present invention is: a kind of Large face repair material of converter, and the weight percent of its chemical composition is: magnesia alumina brick 19-65%, magnesite clinker 27-70%, pre-melted slag 3-4%, tripoly phosphate sodium STPP 3-4%, solid water glass 1-2%.The present invention is mainly used in the hot patching in large face before and after converter.
Description
Technical field
The present invention relates to a kind of repair material for smelting molten steel stove, particularly a kind of repair material for converter working lining and preparation method thereof.
Background technology
Converter is the major equipment of STEELMAKING PRODUCTION, converter is impacted and slag action owing to being subject to mechanical force for a long time at high operating temperatures, causes the refractory materials in the large face of its furnace bottom and front and back to be very easily etched damage, for improving life of converter, reduce steel-making cost, usually converter working lining is safeguarded.The present method adopting maintenance is that splashing slag in converter and large face hot repair carry out simultaneously.Damage due to converter working lining is irregular, molten iron, steel scrap add and the factor such as tapping makes the damage of the refractory materials in the large face of the furnace bottom of converter and front and back comparatively other position is serious, need to adopt repair material to repair to these positions.
Converter working lining needs to have excellent resistance to fouling and erosion, therefore also requires higher to the quality of repair material.At present, large face of converter generally adopts the repair material of MgO base, to resist erosion and the souring of steel-making pyrotic smelting.The Gunning refractory of MgO base comprises magnesian gunning refractory, magnesium-calcium gunning refractory, magnesium chromium matter Gunning refractory etc.Chinese patent CN101792322A discloses a kind of environment-friendly aqueous long-life self-flowing repairing mix for converter and preparation method thereof, with electrosmelted magnesite clinker, magnesite clinker and fine silica powder are main raw material, compound use ferrosilicon powder, carborundum powder and metal fine powder etc. one or more as short burning agent, adopt citric acid, boric acid, tartrate, oxalic acid etc. are retardant, obtain through mix and blend, although environmental protection, but there is preparation cost high defect in it, and there is the evaporation of low molten thing or the steam at high temperature produced due to it, make the working lining short texture after repairing, intensity is very little, there is work-ing life short, converter is repaired frequent, have impact on the production efficiency of converter.Also there is no at present a kind of with low cost, converter working lining repair material that resistance to fouling is high.
Summary of the invention
The object of the invention is: a kind of with low cost, Large face repair material of converter that resistance to fouling is high is provided, solves the technical problem that existing Large face repair material of converter cost is high, resistance to fouling is low.
Technical scheme of the present invention is:
A kind of Large face repair material of converter, the weight percent of its chemical composition is: magnesia alumina brick 19-65%, magnesite clinker 27-70%, pre-melted slag 3-4%, tripoly phosphate sodium STPP 3-4%, solid water glass 1-2%.
Wherein, the ladle of the iron and steel enterprise that magnesia alumina brick employing is reclaimed uses rear discarded magnesia alumina brick, contains certain aluminium, be conducive to the intensity improving converter working lining, and can improve the resistance to fouling of Gunning refractory as Gunning refractory with in rear magnesia alumina brick.
The recycling technique of magnesia alumina brick discarded after ladle uses comprises the following steps: the step that the magnesia alumina brick after ladle being used is removed from ladle, by the step that the slag iron of magnesia alumina brick surface bonding is removed, by the step of magnesia alumina brick fragmentation, magnesia alumina brick after fragmentation is carried out the step of sieving, the separation of iron particle of magnetic separation is carried out to the magnesia alumina brick after screening and then obtains the step of magnesia alumina brick feed particles.The magnesia alumina brick reclaimed, the weight percent of its chemical composition is: MgO76-80%, C14-17%, Al
2o
33-8%, SiO
21-3%.
The add-on of magnesia alumina brick is lower than 19%, and less by the aluminium content adding magnesia alumina brick introducing, it is to the scarce capacity improving working lining permeability resistance, and not obvious to the reduction of Gunning refractory manufacturing cost; The add-on of magnesia alumina brick is higher than 65%, because of use magnesia alumina brick in a large number, the amount of water of repair material and apparent porosity are obviously increased, intensity also reduces, the content of magnesia powder is less simultaneously, cause that the viscosity of repair material is poor, tack reduces, the add-on weight percent of magnesia alumina brick controls at 1-3mm to be good.
Magnesia alumina brick plays skeletal support effect in repair material, volume particle size magnesia alumina brick and original converter working lining contact area are less than the small grain size magnesia alumina brick in homogenous quantities, volume particle size magnesia alumina brick is difficult to merge the key coat forming densification mutually with original working lining, peeling off of repair layer can be caused after repairing, the undersized of magnesia alumina brick, then its intensity can reduce, and can not play the effect of aggregate, and magnesia alumina brick Task-size Controlling is good at 19-65%.
Bonding agent of the present invention adopts tripoly phosphate sodium STPP, Sodium hexametaphosphate 99, solid water glass, silicon powder and light-burning magnesium powder etc., adds viscosity and plasticity that pre-melted slag can improve repair material and large face of converter.Pre-melted slag: pre-melted slag principal constituent is calcium aluminate system (CaO-Al
2o
3), for ensureing purity and homogeneity, production method must adopt electric smelting method to produce, and the pre-melted slag granularity requirements produced is less than 35mm.Pre-melted slag Composition Control scope and other performance index will ask for an interview to table 1.
Table 1: the chemical composition of pre-melted slag
| CaO | Al 2O 3 | SiO 2 | MgO | FeO | TiO 2 |
| 49-54％ | 40-45％ | ＜3.5％ | ＜2.0％ | ＜2.0％ | ＜1.0％ |
| P | S | C | Moisture | Temperature of fusion | / |
| ＜0.05％ | ＜0.05％ | ＜0.05％ | ≤0.3％ | ≯1340℃ | / |
The present invention has following positively effect compared to existing technology:
1. the aluminium containing certain content in the present composition, is conducive to as Gunning refractory the intensity improving converter working lining, and can improves the resistance to fouling of Gunning refractory.
2. the magnesia alumina brick that the ladle of the employing iron and steel enterprise of one of main raw material of the present invention magnesia alumina brick is discarded after using, greatly can reduce the cost of repair material.
Embodiment
A kind of Large face repair material of converter, the weight percent of its chemical composition is: magnesia alumina brick 19-65%, magnesite clinker 27-70%, pre-melted slag 3-4%, tripoly phosphate sodium STPP 3-4%, solid water glass 1-2%.Magnesia-alumina-carbon brick is purchased from Nanjing Mei Shanmeilida Materials Co., Ltd, and model is YHMTZ-95, and pre-melted slag is purchased from Jiaozhuo Zhen De ceramic industry company limited, and model is YRZ-60.
Technique prepared by Large face repair material of converter is, magnesia alumina brick after ladle being used is removed from ladle, then the slag iron that it is bonding is removed, carry out fragmentation again, finally the magnesia alumina brick after fragmentation is sieved, get granularity 1-3mm magnesia alumina brick as raw material, then mix with the magnesite clinker purchased, pre-melted slag stirrer, in the process of mixing, add tripoly phosphate sodium STPP and solid water glass, fully obtain converter working lining of the present invention large repair material after mixing.
Large face repair material of converter is used for repairing hot large face of converter, repairs temperature generally at 800 ~ 1500 DEG C.For such spray repair industrial and mineral condition, first require that Gunning refractory has good tack when hot spray repair.During due to hot spray repair, moisture in sprayed coating sharply evaporates, require that repair material has certain intensity under middle temperature, moisture sharply evaporates simultaneously needs enough air vent channels, higher void content is then conducive to the evaporation of moisture, otherwise sprayed coating easily peels off under the effect of certain water vapor pressure.
The proportioning of the present invention's example enforcement case
Using method: spatter after slag until converter and carry out fettling, consumption is determined as the case may be, after repair material adds body of heater, shakes to proper angle as early as possible by body of heater, do not want grate back and forth, sintering time general control is about 30min.
Adopt after the present invention repairs large face of converter, the average specific in work-ing life of large face of converter adopt conventional existing repair material improve 5 stoves/time, achieve the object improving the life-span, and convenient at the construction process repairing large face of converter, in repairing work, flue dust is little; Present invention employs and use rear magnesia alumina brick, achieve the recycle with rear resistance to material, reduce 260 yuan/ton by its purchase cost of rear magnesia alumina brick than existing conventional magnesian gunning refractory Large face repair material of converter cost, reduce the manufacturing cost of Gunning refractory.
Claims (3)
1. a Large face repair material of converter, the weight percent of its chemical composition is: magnesia alumina brick 19-65%, magnesite clinker 27-70%, pre-melted slag 3-4%, tripoly phosphate sodium STPP 3-4%, solid water glass 1-2%, each weight percentages of components sum is 100%, described pre-melted slag principal constituent is calcium aluminate system, for ensureing purity and homogeneity, production method must adopt electric smelting method to produce, and the pre-melted slag granularity requirements produced is less than 35mm, and described magnesia alumina brick is the magnesia alumina brick after ladle uses.
2. Large face repair material of converter according to claim 1, is characterized in that, the granularity of described magnesia alumina brick is less than or equal to 3mm.
3. the preparation method of Large face repair material of converter according to claim 1, comprises the step of magnesia alumina brick, magnesite clinker, pre-melted slag, tripoly phosphate sodium STPP, solid water glass being carried out being mixed; It is characterized in that, before being also included in the step that is mixed, the magnesia alumina brick step choosing granularity 1-3mm is sieved to magnesia alumina brick.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210117259.5A CN103373854B (en) | 2012-04-20 | 2012-04-20 | A kind of Large face repair material of converter and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210117259.5A CN103373854B (en) | 2012-04-20 | 2012-04-20 | A kind of Large face repair material of converter and preparation method thereof |
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| CN103373854A CN103373854A (en) | 2013-10-30 |
| CN103373854B true CN103373854B (en) | 2015-08-19 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103601515B (en) * | 2013-11-18 | 2015-10-28 | 河南海格尔高温材料有限公司 | A kind of exterior ventilating seat brick hot-patch material and preparation method thereof |
| CN108264362A (en) * | 2016-12-30 | 2018-07-10 | 上海梅山钢铁股份有限公司 | A kind of Large face repair material of converter and preparation method thereof |
| CN112321304A (en) * | 2020-11-03 | 2021-02-05 | 湖南湘钢瑞泰科技有限公司 | Aluminum carbon lower nozzle waste repairing mass |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10253712B4 (en) * | 2002-11-18 | 2005-09-22 | Refratechnik Holding Gmbh | Refractory repair compound offset and method for its manufacture |
| CN1546420A (en) * | 2003-12-03 | 2004-11-17 | 焦作市振德窑业有限责任公司 | Rapid repair material for tap hole brick of revolving furnace and electric furnace |
| CN1804055A (en) * | 2005-01-12 | 2006-07-19 | 宝山钢铁股份有限公司 | Premelting slag for RH vacuum treatment deep desulfurization of ultra low carbon steel |
| CN102372487B (en) * | 2010-08-25 | 2013-04-24 | 宝山钢铁股份有限公司 | Magnesium-carbon gunning mix |
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