CN102212639A - Converter foamed slag pressing agent and using method thereof - Google Patents
Converter foamed slag pressing agent and using method thereof Download PDFInfo
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- CN102212639A CN102212639A CN 201110134378 CN201110134378A CN102212639A CN 102212639 A CN102212639 A CN 102212639A CN 201110134378 CN201110134378 CN 201110134378 CN 201110134378 A CN201110134378 A CN 201110134378A CN 102212639 A CN102212639 A CN 102212639A
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- slag
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Abstract
The invention discloses a converter foamed slag pressing agent and a using method thereof. The converter foamed slag pressing agent comprises the following components in percentage by weight: 30 to 35 percent of CaO, 20 to 25 percent of MgO, 10 to 15 percent of Al2O3, 10 to 15 percent of SiO2, less than 1 percent of FeO, 1.5 to 2.5 percent of B2O3, and the balance of impurities. The using method comprises that: the converter foamed slag pressing agent is added into a converter at the carbon oxidation period of converter blowing, wherein the adding amount of the slag pressing agent is 2 to 3 kg/t of molten steel. Wastes produced after the production of corresponding industries are used in the slag pressing agent, so the slag pressing agent is favorable for saving energy, improving the utilization rate of resources and protecting the environment, and simultaneously is favorable for promoting proper foaming in the converter.
Description
Technical field
The invention belongs to metallurgical technology field, particularly a kind of converter foamy slag is pressed slag agent and using method thereof.
Background technology
In converter steelmaking process, because the oxygen jet acutely mixes molten bath upper metal, slag and gas three-phase to the intense impact in molten bath and the wallop of carbon-oxygen reaction generation CO bubble, form emulsification and foam state flourishing in the converter.Accurately emulsification concept refers to molten drop or bubble disperse in slag, if drop or bubbles volume are littler and can freely-movable in slag, then this phenomenon is slag steel or the emulsification of slag gas; If bubble is only arranged in the slag, and quantity is many or bubble is big, makes the bubble can't freely-movable, and then this phenomenon is the slag foamed, and it is a kind of common phenomenon in the slag gas emulsification system.
At the converter carbon period, development and decline take place along with carbon-oxygen reaction ups and downs in emulsification and frothing.Bubble level and converter oxygen supply and slagging regime, and slag ingredient, slag viscosity etc. are closely related, it is to be attended by a kind of complicated phenomenon that influenced by multiple operation factors that chemical reaction takes place under the high temperature.There are some researches show, total oxygen blow duration 1/4 after, shower nozzle is immersed in the emulsion, after this oxygen rifle such as inflator constantly make the slag foaming; Total oxygen blow duration about 1/2 after, liquid level increases to the top, this moment the decarbonization rate maximum; Last 1/10 at total oxygen blow duration is because the molten bath phosphorus content reduces and decarbonization rate descends and makes liquid level decline.
In operation control not at that time, can cause foamed slag especially to develop, the top of the slag is gone up fast.Usually the carbon period fire door of the seeing slag that overflows is exactly the foamed slag prosperity, and the slag liquid level goes up highly above due to the fire door.The operation serious mistake will cause splash, and slag iron moment is gushed, and cause and blow damage, increase iron and steel stock consumption.Simultaneously, splash also jeopardizes operator safety and possibility burning apparatus.Therefore directly start with from the development of inhibition foamed slag and take measures, will be more favourable to the hidden danger that the excessive foamed of elimination slag is brought, and also do not have at present such solution of problem technical scheme of disclosed Introduction of Literatures.
Summary of the invention
The purpose of this invention is to provide a kind of converter foamed slag pressing agent and using method thereof, by when bessemerizing, adding foamed slag pressing agent, suppress the development of foam, accelerate simultaneously smelting process, improve the life-span of refractory material, environmental contamination reduction.
The composition of converter foamed slag pressing agent of the present invention contains CaO30 ~ 35% by weight percentage, MgO20 ~ 25%, Al
2O
310 ~ 15%, SiO
210 ~ 15%, FeO＜1%, B
2O
31.5 ~ 2.5%, surplus is impurity.
It is the spherical of diameter 20 ~ 30mm that above-mentioned foamy slag is pressed the slag agent.
Above-mentioned converter foamy slag presses the preparation method of slag agent to carry out according to the following steps:
1, boron mud powder, metallurgy lime powder and aluminium ash are mixed, blending ratio is carried out proportioning according to the chemical analysis results of each raw material by mentioned component;
2, with the moistening rolling balling of mixed material water on pelletizer, diameter 20 ~ 30mm, seasoning or dry under 120 ± 10 ℃ of conditions then to moisture weight content＜1%, obtains the converter foamy slag and presses the slag agent.
Above-mentioned boron mud powder is to make after being pulverized by boron mud drying, and main component contains MgO35 ~ 45%, SiO by weight percentage
222 ~ 32%, B
2O
32.5 ~ 5.6%, Al
2O
30.1 ~ 5.0%, CaO2.0 ~ 6.0%, moisture 1wt%, surplus is impurity;
The above-mentioned waste residue of aluminium ash for producing in the industrial aluminium generation fused operation, wherein alumina weight content is 75 ~ 80%, surplus is oxide compound and the impurity of Mg, Si, Fe.
Converter foamy slag of the present invention presses the using method of slag agent to be:
At the carbon period of bessemerizing, press the slag agent to join in the converter converter foamy slag, add-on is 2 ~ 3kg/t molten steel.
In the above-mentioned using method, press the slag agent to be transported in the converter liftout storehouse converter foamy slag, join in the converter by feeder system.
In the above-mentioned using method, converter foamed slag pressing agent divided secondary or joins in the converter for three times at the oxidation of coal of bessemerizing before mid-term.
Oxygen coverter foamy slag of the present invention presses slag agent granularity at 20 ~ 30mm, granularity is between the middle limit of lime block size range, and the granularity fluctuation range is little, join and pass through slag blanket after the converter and can play the physical damage effect the bubble in the slag, make gas evolution in the slag, thereby suppress the trend that slag steeps excessive foamed.Smelting is to have certain basicity, suitable oxidisability and flowability, appropriate foamed to the requirement of slag; Improve basicity of slag and just need to add alkaline slag making materials, foamed slag pressing agent main body composition of the present invention is CaO, MgO, SiO
2, steel-making main slag material commonly used just; Simultaneously, owing to boron mud in the pressure agent contains B
2O
3, it is the low melting point flux, is conducive to original slag charge fusing in foamed slag pressing agent self and the stove, therefore product of the present invention is equivalent to the synthetic slag former of boracic, is conducive to promote and participate in the converter rapid slagging, is conducive to promote to smelt finishing of task.
Converter smelting is Si, Mn oxidation period in earlier stage, because adding main slag making materials lime, a large amount of oxidations of Si, Mn and institute do not melt fully as yet and slagging, therefore in Si, Mn oxidation end and oxidation of coal initial stage, basicity of slag is not high, have the complicated chain or the web-like silicon oxonium ion of a large amount of large groups in the slag, slag viscosity is very big; Can produce O when adding
2-Oxide compounds such as CaO, MgO the time, can impel complicated silica ion to be cracked into simple silica ion, bits viscosity is reduced, this low viscosity slag makes in the slag gas be discharged easily; Product of the present invention is a main component with CaO, MgO, helps reducing slag viscosity, thereby also helps the discharge of gas in the foamy slag.
B
2O
3Be very effective flux in the steelmaking process, its fusing point is 450 ℃, can rapid melting in slag, simultaneously can with slag in the multiple basic anhydride such as CaO, MgO form the low melting point complex chemical compound, be 988 ℃ MgO B such as fusing point
2O
3, fusing point is 1100 ℃ CaO B
2O
3Deng, make the slag system melting point depression, promote the CaO dissolving, accelerate the carrying out of refining process; B
2O
3Ratio is by CaF
2The complex chemical compound fusing point that forms with slag neutral and alkali oxide is relative low about 300 ℃, and its ionic radius is little, and effect is rapid, so be to compare CaF
2More effective flux can promote rapid slagging; Introduce according to the study B in the slag
2O
3Every increase by 1% can reduce about 25 ℃ of slag molten temps; In addition, use B
2O
3Replace CaF
2Change slag, can reduce CaF
2To the erosion of furnace lining, help to improve refractory material service life, also reduced CaF simultaneously
2To the pollution of environment and the harm of human body.
Raw materials used boron mud of product of the present invention and aluminium ash all are the waste products after the corresponding industry production; Boron mud mainly contains alkaline matter, and not even a blade of grass grows for the discharging part, influences soil and water quality; The back Chang Suifeng that dries out disperses, and ecological and atmosphere are worked the mischief; Also contain the aluminium ash in the raw material, it is the waste residue in the aluminium melting process, and recovery bauxite resource wherein can reduce cost and protect environment.The present invention provides new use approach for above-mentioned industrial waste, and is all favourable with raising resource utilization and environmental protection to energy savings, helps simultaneously to solve the problem of the suitable foamed of slag in the converter.
Embodiment
The boron mud powder that adopts in the embodiment of the invention is by boron mud after drying, will become the piece partial crushing to make with physical method, and main component is a magnesium oxide, and all the other compositions are the oxide compound and the impurity of boron, silicon, aluminium, calcium and potassium.
The boron mud that the present invention adopts is the by product that produces when being raw material production borax and boric acid with the szaibelyite, adopts wet method to discharge boron mud in the production process, and boron mud natural moisture content is 25 ~ 35wt%, is the tiny brown mud shape of particle.
The metallurgy lime powder main component that adopts in the embodiment of the invention is CaO, content 80 ~ 90%, and surplus is an impurity.
The aluminium ash that adopts in the embodiment of the invention is the waste residue that produces in the industrial aluminium generation fused operation, and wherein alumina weight content is 75 ~ 80%, and surplus is oxide compound and the impurity of Mg, Si, Fe.
The pelletizer that adopts in the embodiment of the invention is disc balling machine.
Embodiment 1
The composition of converter foamed slag pressing agent contains CaO35%, MgO20%, Al by weight percentage
2O
315%, SiO
215%, FeO0.6%, B
2O
31.5%, impurity 12.9%, outward appearance is the spherical of diameter 20mm;
The preparation method is: boron mud powder, metallurgy lime powder and aluminium ash are mixed, and blending ratio is carried out proportioning according to the chemical analysis results of each raw material by mentioned component; With the moistening rolling balling of mixed material water on pelletizer, diameter 20mm, the consumption of water was as the criterion can make the material balling-up when water was moistening;
Seasoning obtains the converter foamy slag and presses the slag agent to moisture weight content＜1% then;
Using method is:
Smelt ordinary steel in the 150t converter, molten iron is handled through pre-desulfurization;
Press the slag agent to be transported in the converter liftout storehouse converter foamy slag, joined in the converter by feeder system, in oxidation of coal average mark secondary adding before mid-term, total add-on is the 2kg/t molten steel;
After adding foamed slag pressing agent, the foamed trend in the converter obviously reduces, and smelting process is steady, and the terminal point hit rate improves.Adopt same equipment by original technology refining, the quantity of slag, smelting endpoint composition and temperature controlled water are flat general, and it is undesired that molten iron causes rhythm of production not enough sometimes, has splash and excessive slag phenomenon and occur.
Embodiment 2
The composition of converter foamed slag pressing agent contains CaO30%, MgO25%, Al by weight percentage
2O
310%, SiO
210%, FeO0.9%, B
2O
32.0%, impurity 22.1%, outward appearance is the spherical of diameter 25mm;
The preparation method is: boron mud powder, metallurgy lime powder and aluminium ash are mixed, and blending ratio is carried out proportioning according to the chemical analysis results of each raw material by mentioned component; With the moistening rolling balling of mixed material water on pelletizer, diameter 25mm, the consumption of water was as the criterion can make the material balling-up when water was moistening;
Under 120 ± 10 ℃ of conditions, dry then, obtain the converter foamy slag and press the slag agent to moisture weight content＜1%;
Using method is:
80t converter smelting ordinary steel, molten iron is processed the hot metal composition instability through pre-desulfurization;
Press the slag agent to be transported in the converter liftout storehouse converter foamy slag, joined in the converter by feeder system, in oxidation of coal three addings of average mark before mid-term, total add-on is the 2.5kg/t molten steel;
Foamed slag pressing agent has many-sided effect of pressing slag, slag making, change slag after using, and accelerates slagging and the effect that suppresses the foamed slag excessive development is arranged; Adopt same equipment by original technology refining, the quantity of slag, the Terminal Process Control level is general, has splash and excessive slag phenomenon to occur.
Embodiment 3
The composition of converter foamed slag pressing agent contains CaO30%, MgO25%, Al by weight percentage
2O
310%, SiO
210%, FeO0.5%, B
2O
32.5%, impurity 22%, outward appearance is the spherical of diameter 30mm;
The preparation method is: boron mud powder, metallurgy lime powder and aluminium ash are mixed, and blending ratio is carried out proportioning according to the chemical analysis results of each raw material by mentioned component; With the moistening rolling balling of mixed material water on pelletizer, diameter 30mm, the consumption of water was as the criterion can make the material balling-up when water was moistening;
Under 120 ± 10 ℃ of conditions, dry then, obtain the converter foamy slag and press the slag agent to moisture weight content＜1%;
Using method is:
Press the slag agent to be transported in the converter liftout storehouse converter foamy slag, joined in the converter by feeder system, in oxidation of coal three addings of average mark before mid-term, total add-on is the 3kg/t molten steel;
Foamed slag pressing agent has many-sided effect of pressing slag, slag making, change slag after using, and accelerates slagging and the effect that suppresses the foamed slag excessive development is arranged; Adopt same equipment by original technology refining, the quantity of slag, smelting endpoint Composition Control level is general, has splash and excessive slag phenomenon to occur.
Claims (4)
1. a converter foamed slag pressing agent is characterized in that the composition of this pressure agent contains CaO30 ~ 35% by weight percentage, MgO20 ~ 25%, Al
2O
310 ~ 15%, SiO
210 ~ 15%, FeO＜1%, B
2O
31.5 ~ 2.5%, surplus is impurity.
2. a kind of converter foamy slag according to claim 1 is pressed the slag agent, it is characterized in that this pressure slag agent is the spherical of diameter 20 ~ 30mm.
3. the using method of the described converter foamed slag pressing agent of claim 1, it is characterized in that carrying out according to the following steps: at the carbon period of bessemerizing, converter foamed slag pressing agent is joined in the converter, addition is 2 ~ 3kg/t molten steel; The composition of described converter foamed slag pressing agent contains CaO30 ~ 35% by weight percentage, MgO20 ~ 25%, Al
2O
310 ~ 15%, SiO
210 ~ 15%, FeO＜1%, B
2O
31.5 ~ 2.5%, surplus is impurity.
4. converter foamy slag according to claim 3 is pressed the using method of slag agent, it is characterized in that the converter foamy slag presses the slag agent to divide secondary before mid-term or join in the converter for three times at the oxidation of coal of bessemerizing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110134378 CN102212639A (en) | 2011-05-24 | 2011-05-24 | Converter foamed slag pressing agent and using method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110134378 CN102212639A (en) | 2011-05-24 | 2011-05-24 | Converter foamed slag pressing agent and using method thereof |
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|---|---|
| CN102212639A true CN102212639A (en) | 2011-10-12 |
Family
ID=44744170
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103572000A (en) * | 2012-07-19 | 2014-02-12 | 宝钢不锈钢有限公司 | Low fluorine melting point lowering agent for chromium-containing hot metal smelting, and use methods thereof |
| CN103667599A (en) * | 2013-01-21 | 2014-03-26 | 营口联众冶金技术有限公司 | Environment-friendly molten steel refining fluxing slag |
| CN105132613A (en) * | 2015-09-25 | 2015-12-09 | 唐山不锈钢有限责任公司 | Application of coal gangue used as converter slag inhibiting agent, and converter slag inhibiting method |
| CN109321706A (en) * | 2018-12-15 | 2019-02-12 | 新疆互力佳源环保科技有限公司 | Prevent the safe technology that converter slag ladle contains desiliconization slag and splash occurs for dephosphorized slag |
| CN111593162A (en) * | 2020-05-29 | 2020-08-28 | 攀钢集团攀枝花钢铁研究院有限公司 | Converter slag pressing agent and use method thereof |
| CN113042720A (en) * | 2021-02-23 | 2021-06-29 | 首钢京唐钢铁联合有限责任公司 | Molten iron inhibitor and preparation method and use method thereof |
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| JP2003027122A (en) * | 2001-07-11 | 2003-01-29 | Sumikin Koka Co Ltd | Defoaming agent and its producing method |
| CN101519712A (en) * | 2009-04-03 | 2009-09-02 | 江苏大学 | Ladle refining slag modifier, preparation method and slag modifying method |
| CN101824506A (en) * | 2010-05-28 | 2010-09-08 | 攀枝花钢城集团有限公司 | Revolving furnace slag pressing agent and revolving furnace slag pressing method |
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2011
- 2011-05-24 CN CN 201110134378 patent/CN102212639A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003027122A (en) * | 2001-07-11 | 2003-01-29 | Sumikin Koka Co Ltd | Defoaming agent and its producing method |
| CN101519712A (en) * | 2009-04-03 | 2009-09-02 | 江苏大学 | Ladle refining slag modifier, preparation method and slag modifying method |
| CN101824506A (en) * | 2010-05-28 | 2010-09-08 | 攀枝花钢城集团有限公司 | Revolving furnace slag pressing agent and revolving furnace slag pressing method |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103572000A (en) * | 2012-07-19 | 2014-02-12 | 宝钢不锈钢有限公司 | Low fluorine melting point lowering agent for chromium-containing hot metal smelting, and use methods thereof |
| CN103667599A (en) * | 2013-01-21 | 2014-03-26 | 营口联众冶金技术有限公司 | Environment-friendly molten steel refining fluxing slag |
| CN103667599B (en) * | 2013-01-21 | 2015-10-28 | 营口联众冶金技术有限公司 | A kind of environment-friendly type liquid steel refining fluxing slag |
| CN105132613A (en) * | 2015-09-25 | 2015-12-09 | 唐山不锈钢有限责任公司 | Application of coal gangue used as converter slag inhibiting agent, and converter slag inhibiting method |
| CN105132613B (en) * | 2015-09-25 | 2017-10-10 | 唐山不锈钢有限责任公司 | The application and converter that gangue presses down slag agent as converter press down the method for slag |
| CN109321706A (en) * | 2018-12-15 | 2019-02-12 | 新疆互力佳源环保科技有限公司 | Prevent the safe technology that converter slag ladle contains desiliconization slag and splash occurs for dephosphorized slag |
| CN111593162A (en) * | 2020-05-29 | 2020-08-28 | 攀钢集团攀枝花钢铁研究院有限公司 | Converter slag pressing agent and use method thereof |
| CN113042720A (en) * | 2021-02-23 | 2021-06-29 | 首钢京唐钢铁联合有限责任公司 | Molten iron inhibitor and preparation method and use method thereof |
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Application publication date: 20111012 |