CN101519712A - Ladle refining slag modifier, preparation method and slag modifying method - Google Patents
Ladle refining slag modifier, preparation method and slag modifying method Download PDFInfo
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- CN101519712A CN101519712A CN200910029247A CN200910029247A CN101519712A CN 101519712 A CN101519712 A CN 101519712A CN 200910029247 A CN200910029247 A CN 200910029247A CN 200910029247 A CN200910029247 A CN 200910029247A CN 101519712 A CN101519712 A CN 101519712A
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- slag
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The invention belongs to the technical field of steelmaking and refining, and discloses a ladle refining slag modifier, a preparation method and a slag modifying method. The slag modifier comprises the following chemical components in percentage by mass: 30 to 60 percent of CaO, 30 to 60 percent of Al2O3, 2 to 10 percent of MgO2, 2 to 10 percent of B2O3, and less than 8 percent of impurities. The slag modifying method using the slag modifier comprises that: the slag modifier is hoisted to the front of a refining furnace after a steelmaking furnace discharges steels, and then is directly fed into ladles, or the slag modifier can also be fed into the furnace along with other slags at a refining station; the components of modifying slag are determined according to the ladle residue amount and components, desulfuration amount and steel deoxidation product amount; and the modifying slag for controlling the ladle slag comprises the following components according to the adding amount: 48 to 54 percent of CaO, 26 to 32 percent of Al2O3, 6 to 8 percent of MgO, 2 to 4 percent of B2O3, and 0 to 8 percent of SiO2, wherein the modifying slag is better if the content of the SiO2 is lower. The slag modifier has the capabilities of quickly manufacturing the slag, improving desulfuration and deoxidation of the refining slag and accommodating and absorbing deoxidation products, and is simple to prepare and convenient to store, transport and use.
Description
Technical field
The present invention relates to a kind of ladle refining slag slag supplying agent and preparation method thereof and residue adjustment method, particularly a kind of steel melting furnace tapping back belongs to technical field of steelmaking and refining to the refining slag slag supplying agent that residue in the ladle carries out modifier treatment and refining process adding.
Background technology
Along with The development in society and economy, the user has proposed more and more higher requirement to the quality of steel, China has also proposed development " super-steel plan " at the beginning of century, one of realization means of super-steel are exactly the high pure of steel, promptly very strict to the content requirement of sulphur, phosphorus, oxygen and inclusion in the steel, as requiring S in the steel＜0.005% in the high trade mark pipe line steel, total oxygen T[O in the bearing steel]＜0.0007. is therefore, traditional converter process is difficult to satisfy, furnace outer refining technology is able to fast development, and the liquid steel refining rate of large-scale iron and steel enterprise reaches 100%.External refining is to carry out in the ladle after the steel melting furnace tapping, difference according to the main body refining function, form multiple refinery practice, wherein ladle furnace refining comprises technologies such as LF and CAS-OB, by preparing or control dark desulfurization, the phosphorus of ladle top slag realization to molten steel, adjust composition and temperature, remove steel inclusion or to its denaturing treatment etc., has multiple refining function, and ladle furnace refining technology has also that equipment is simple, the construction period is short, less investment, advantages such as easy controlled operation, so ladle furnace refining becomes one of the most general furnace outer refining process.One of gordian technique of ladle furnace refining is to make the synthetic slag refining with good metallurgical performance, because the steel melting furnace tapping process can not be realized slag free tapping fully at present, and at present in the ladle slagging-off technology that is that all right is ripe, to consider the influence of the remaining steel-making slag of ladle when therefore making synthetic slag, in addition, the ladle furnace refining process need carries out deoxidization desulfuration etc. to steel, the clearance of these deoxidization desulfuration products and these components all need to take all factors into consideration to ladle furnace refining slag Effect on Performance, so, the slagging process more complicated of ladle furnace refining but most important, refining slag will have good desulfurization, deoxidation, the ability that absorption is mingled with also will have promptly lower fusing point of good melting properties and suitable viscosity.
Traditional treatment process is that adding the calcium carbide piece in ladle slag (mainly is CaC after the steel melting furnace tapping
2) and the aluminium slag (mainly be Al
2O
3), the effect of calcium carbide piece mainly is to make iron oxide reduction in the slag, guarantee the reductibility of slag, the effect that has desulfurization simultaneously, the effect of aluminium slag is a melting properties of adjusting slag, adds lime in the ladle furnace refining process to reach the purpose of desulfurization, because the fusing point of lime is higher in slag, for quickening the lime fusion, will add the fusing assistant fluorite when adding lime (mainly is CaF
2).The deficiency of above-mentioned slagging process mainly contains: (one), fluorite are made fusing assistant because its effect of fluxing is general, so its add-on is bigger, the pyrolytic decomposition of fluorite and with the reaction of other oxide compounds, cause serious fluoride pollution; (2), slag making speed is slow, it is low to smelt efficient, has prolonged refining time; (3), lime, aluminium slag and fluorite must use after toasting, and produces volume of smoke in the use, cause the environment of significant loss and severe exacerbation operation site, and slag ingredient is inhomogeneous, reduces refining efficiency.At the problems referred to above, Chinese invention patent: CN 1224722C (denomination of invention: aluminium calcium slag and preparation method thereof) propose to take raw materials such as lime, aluminium slag are made the fritting slag modifier for refining, can under situation, improve the onset speed of slag supplying agent like this, be worth using for reference without fluorite; But the main deficiency of this invention is the helpless branch that is melt in this pre-melted slag, fusing point is more than 1350 ℃, so its fusing time is longer in the adding stove, onset speed is slow, in addition, aspect the preparation technology of pre-melted slag, owing to contain the Calucium Silicate powder composition in the slag, after this slag fritting, if do not adopt special method for rapid cooling, occur the nature efflorescence after solidifying, influence result of use.
In sum, study a kind of free-floride, to be mingled with ability ladle refining slag supplying agent strong, that be convenient to accumulating and use be to give full play to the ladle refining function, improve refining effect, shorten the key of refining time for fast, the desulfurization of burn-off rate and absorption.
Summary of the invention
Residue adjustment treatment process when the purpose of this invention is to provide the preparation method of a kind of slag supplying agent of novel ladle refining slag and this slag supplying agent and using this slag supplying agent, by modified to top slag in the ladle, make it satisfy the requirement of ladle refining, give full play to the ladle refining function, improve the effect of refining slag desulfurization, deoxidation and absorption inclusion, solve the key issue that present ladle furnace slag making refining exists.
The objective of the invention is to realize by following technical proposal:
A kind of ladle refining slag supplying agent is characterized in that: composition is in mass percent, CaO30～60%, Al
2O
330～60%, MgO2～10%, B
2O
32～10%, the impurity in the slag supplying agent should be less than 8%.
In the above-mentioned slag supplying agent, impurity comprises SiO
2, sulphur and phosphorus.
The preparation method of the slag supplying agent of above-mentioned composition is characterized in that: by industrial reagent: unslaked lime, aluminium ash, magnesia and boric anhydride, by above-mentioned given composition preparation, the content of impurity is low more good more in the raw material, will satisfy SiO after its batching
2, impurity such as sulphur and phosphorus is less than 8%.Answer thorough drying before the raw material weighing, through weigh batching, be ground into the following particle of 10mm, behind batch mixing, add smelting furnace, after 1350 ℃ of fusings evenly, in stove, emit, liquid slag is cooled to grains of sand shape fast under the high pressure water impact of 0.25～0.6MPa, get final product packed for standby use after grain slag drying plant drying.
The residue adjustment method that adopts this slag supplying agent is that steel melting furnace tapping back is directly dropped into ladle in handling to refining furnace, also can after reaching the refining station, ladle add in the ladle furnace with other slag charge, the composition of modified slag is determined according to ladle residue composition and the quantity of slag, desulfurization amount and steel-deoxidizing product amount, the composition of slag supplying agent and add-on consist of in the control ladle refining slag: with mass percent, CaO 48～54%, Al
2O
326～32%, MgO 6～8%, B
2O
32～4%, SiO
20～8%, SiO wherein
2Content is low more good more.
The adding slag supplying agent is modulated into the ladle refining slag of above-mentioned composition, have the basicity height, sweetening power is strong, holds characteristics such as the ability that absorbs the aluminium deoxidation product is strong, simultaneously, the refining slag of high basicity and high MgO content can effectively be controlled the erosion of ladle refining slag to the cylinder-packing refractory materials, in addition the B in the slag
2O
3Play good fluxing action, the fusing point of above-mentioned composition slag is at 1200～1230 ℃, viscosity in the time of 1300 ℃ is less than 0.1Pas, help quick slag making, absorb the residual oxygen in more inclusion and the reduction steel than low melting point and viscosity, higher basicity and lower viscosity then help desulfurization and deoxidation.
Therefore, major advantage of the present invention is summarized as follows:
1, adds boron oxide in the modified slag and make fusing assistant, replace fluorite, overcome fluoride pollution, and boron oxide has the very strong effect of fluxing, slag supplying agent is rapid-action, residue adjustment is effective, ladle after residue adjustment is handled has promptly been brought into play the residue adjustment effect in handling in the process of refining station, the residue adjustment time is shortened in the 2min by 2 original～5min, after the residue adjustment, the fusing point of slag and viscosity are all low than adopting other slag supplying agent (as lime+fluorite, lime+aluminium slag+fluorite), the fusing point of modified slag is low, realizes rapid slag and has improved the refining effect of ladle slag;
2, modified basicity of slag height, fusing point is low, helps desulfurization, deoxidation and removal steel inclusion, to deoxidation products Al
2O
3The receptivity of holding improve;
3, the magnesia in the adjusting material has the furnace lining of minimizing by the effect of scouring, and the life-span of slag lining refractory materials is enhanced about more than once;
4, water steel after, the ladle slag vitrifying that remains in the ladle is obvious, is easy to cleaning, ladle dry slag problem is solved;
5, the preparation method of modified slag adopts the quick granulation refrigerative of fritting+high pressure water impact method, the slag particle degree that this method makes is even, no efflorescence, overcome the pulverizing problem that in the past prepares the slow process of cooling of pre-melted slag, also saved the broken process of fritting clinker, therefore pre-melted slag of the present invention cooling fast after the high pressure water granulation, no fine powder, greatly the reduction of degree on-the-spot dust rate, improved the Working environment at refining scene;
6, spreadability was good after grains of sand slag supplying agent was thrown bag, and slagging is rapid, and the use of slag supplying agent is flexible, can use simultaneously with other reductive agents, reductor and slag making materials etc., and this modified slag also has the characteristics of being convenient to accumulating.
Embodiment
Embodiment 1
The invention will be further elaborated below in conjunction with embodiment.Embodiment only is used to illustrate the present invention, rather than limits the present invention by any way
(1) preparation of pre-melted slag
The raw material that embodiment adopts is as follows, all is weight percentage when below relating to percentage ratio:
The chemical constitution of quickened lime is: 100%〉CaO 〉=90.0,5% 〉=MgO〉0,2.5% 〉=SiO
20, all the other are Al
2O
3Deng trace impurity;
The chemical constitution of aluminium ash: 100%〉Al
2O
3〉=90.0,5% 〉=CaO〉0,3% 〉=MgO〉0,1.5% 〉=SiO
20, all the other are trace impurity;
The chemical constitution of magnesia: 100%〉MgO 〉=90.0,5% 〉=CaO〉0,3% 〉=Al
2O
30,1% 〉=SiO
20, all the other are trace impurity;
The chemical constitution of boric anhydride: 98.0%〉B
2O
3〉=85.0,5% 〉=CaO〉0,3% 〉=MgO〉0,3% 〉=SiO
20, all the other are trace impurity;
Get above-mentioned raw materials 150～300 ℃ of baking back weighings down; quickened lime 100Kg; aluminium ash 80Kg; magnesia 12Kg; boric anhydride 8Kg; each raw material crushing is become below the 1mm, join behind the mechanical mixing in the refractory materials container (similar ladle), make it 1350 ℃ of fusings down with the coal gas heating; be transported to the flush slag place after melting clearly; slowly pour slag into slag trough, the end of slag trough is provided with water blast gun, implements high pressure water flushing cinder granulation; hydraulic pressure 0.5MPa; behind sedimentation and filtration, the water breakthrough flushing cinder is pulled out, and dry back is stand-by.The chemical constitution of this flush slag is: CaO50%, Al
2O
339%, MgO 4%, B
2O
34%, SiO
22%, surplus impurity 1%.
(2) use of pre-melted slag
Get above-mentioned pre-melted slag, carry out commerical test on 30 tons of LF ladle refining furnaces, the smelting steel grade is a carbon aluminium-killed steel, behind the converter tapping,, measure the composition of ladle slag and estimate its following quantity of slag at 300Kg at the converter tapping station, add calcium carbide powder 20Kg and slag supplying agent 100Kg, be transported to the refining station in the 2min, slag is changed, behind the refining 15min, alloying behind the aluminium deoxidation, steel sample after getting final refining slag and refining behind the soft blow argon 5min, by analysis, the composition of refining finishing slag is that CaO 52%, Al
2O
332%, MgO 8%, B
2O
33%, SiO
25%, the massfraction of sulphur is 0.0004% in the steel, total oxygen T[O] massfraction be 0.0006, desulfurization degree when adopting this synthetic slag refining is 81.7%, the deoxidation rate is 55%, average desulfurization degree (50% below) when directly adopting lime+aluminium ash+fluorite slag making and on average deoxidation rate (about 30%) significantly raising is arranged, in addition, from slag making speed, the spreadability that the modified slag of fritting adds behind the ladle is very good, sludging time is in 2min, and the flowability that slagging speed improves slag satisfies efficient requirement of smelting, water steel after, the dry slag of ladle wall seldom, substantially can arrive totally, ladle slag line position erosion amount is very little, and it is overweight and improved ladle continuous work-ing life to have controlled the ladle dry slag.
For result of use of the present invention is adopted in contrast, following table has provided and has adopted lime+fluorite, lime+aluminium slag+fluorite pre-melted slag on the 30tLF refining furnace respectively and use slag supplying agent residue adjustment of the present invention to handle melting properties index and the metallurgical index and the service condition contrast of back slag.(annotate: average data is for using the average result of 30 stoves respectively in the table)
From above correlation data as can be known: use this slag supplying agent, the fusing point of slag and viscosity reduce, and average refining time shortens, and average desulfurization degree and average deoxidation rate improve, and have reduced lining erosion and ladle wall dry slag amount, have effectively improved ladle life.
Claims (4)
1, a kind of ladle refining slag supplying agent is characterized in that: composition is in mass percent, and CaO 30～60%, Al
2O
330～60%, MgO 2～10%, B
2O
32～10%, the impurity in the slag supplying agent should be less than 8%.
2, the described slag supplying agent of claim 1, it is characterized in that: impurity comprises SiO
2, sulphur and phosphorus.
3, the preparation method of the described slag supplying agent of claim 1, it is characterized in that: with unslaked lime, aluminium ash, magnesia and boric anhydride thorough drying, behind weigh batching, be ground into the following particle of 10mm, behind batch mixing, add smelting furnace, after 1350 ℃ of fusings evenly, liquid slag is cooled to grains of sand shape fast under the high pressure water impact of 0.25～0.6MPa, packing is used after grain slag drying plant drying.
4, adopt the residue adjustment method of claim 1 or 2 described ladle refining slag supplying agents, it is characterized by: slag supplying agent directly drops into ladle to the refining furnace or adds in the stove with other slag charge at the refining station in the handling of steel melting furnace tapping back, the slag supplying agent add-on consists of with the control ladle refining slag: CaO 48～54%, Al
2O
326～32%, MgO 6～8%, B
2O
32～4%, SiO
20～8% is as the criterion, wherein SiO
2Content is low more good more.
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|---|---|---|---|
| CN2009100292475A CN101519712B (en) | 2009-04-03 | 2009-04-03 | Ladle refining slag modifier, preparation method and slag modifying method |
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|---|---|---|---|
| CN2009100292475A CN101519712B (en) | 2009-04-03 | 2009-04-03 | Ladle refining slag modifier, preparation method and slag modifying method |
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| Publication Number | Publication Date |
|---|---|
| CN101519712A true CN101519712A (en) | 2009-09-02 |
| CN101519712B CN101519712B (en) | 2011-01-05 |
Family
ID=41080508
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|---|---|---|---|
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101665857B (en) * | 2008-12-25 | 2011-03-23 | 营口晟尔冶金新材料有限公司 | Novel liquid steel refining fluxing slag |
| CN102212639A (en) * | 2011-05-24 | 2011-10-12 | 大石桥市荣源镁矿有限公司 | Converter foamed slag pressing agent and using method thereof |
| CN102747194A (en) * | 2012-07-18 | 2012-10-24 | 河南通宇冶材集团有限公司 | Fluoride-free environmental-friendly slag dilution solvent for electric furnace, converter and medium frequency furnace and preparation method of fluoride-free environmental-friendly slag dilution solvent |
| CN102041355B (en) * | 2009-10-23 | 2012-12-12 | 宝山钢铁股份有限公司 | Ladle slag modifier for stainless steel refining process |
| CN103451374A (en) * | 2013-09-22 | 2013-12-18 | 新疆中合大正商贸有限公司 | Production process of aluminium slag adjusting agent for LF refining furnace |
| 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 |
| CN104046747A (en) * | 2013-10-19 | 2014-09-17 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Medium and low carbon steel, molten steel refining flux of medium and low carbon steel, preparation method of steel, and preparation method of flux |
| CN104232845A (en) * | 2014-09-03 | 2014-12-24 | 浙江瑞浦科技有限公司 | Argon oxygen decarburization (AOD) slag-making method during smelting of sulfur-containing free-cutting stainless steel |
| CN104342533A (en) * | 2013-07-31 | 2015-02-11 | 沈阳铸造研究所 | Special slag forming agent for smelting steel containing active elements and preparation method thereof |
| TWI487794B (en) * | 2012-01-12 | 2015-06-11 | Nat Univ Chung Hsing | Adjustment agent for steelmaking |
| CN106337101A (en) * | 2016-11-11 | 2017-01-18 | 攀钢集团攀枝花钢铁研究院有限公司 | Calcium series top slag modification agent and application method thereof |
| CN110106311A (en) * | 2019-05-16 | 2019-08-09 | 中天钢铁集团有限公司 | It is a kind of to reduce the refining slag control technique corroded resistance to material |
| CN111485063A (en) * | 2020-06-06 | 2020-08-04 | 内蒙古铧钰环保材料有限公司 | High-efficiency utilization process of aluminum ash in electrolytic aluminum plant |
| CN111996335A (en) * | 2020-09-10 | 2020-11-27 | 河北工程大学 | Core-spun yarn core powder composition for high-aluminum steel production and processing method |
| CN112011669A (en) * | 2019-05-29 | 2020-12-01 | 宝山钢铁股份有限公司 | Molten iron slag modifier |
| CN114150108A (en) * | 2021-12-03 | 2022-03-08 | 商丘市商鼎耐火材料有限公司 | High-aluminum slag modifier for refining and using aluminum ash as raw material and using method thereof |
-
2009
- 2009-04-03 CN CN2009100292475A patent/CN101519712B/en not_active Expired - Fee Related
Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101665857B (en) * | 2008-12-25 | 2011-03-23 | 营口晟尔冶金新材料有限公司 | Novel liquid steel refining fluxing slag |
| CN102041355B (en) * | 2009-10-23 | 2012-12-12 | 宝山钢铁股份有限公司 | Ladle slag modifier for stainless steel refining process |
| CN102212639A (en) * | 2011-05-24 | 2011-10-12 | 大石桥市荣源镁矿有限公司 | Converter foamed slag pressing agent and using method thereof |
| TWI487794B (en) * | 2012-01-12 | 2015-06-11 | Nat Univ Chung Hsing | Adjustment agent for steelmaking |
| CN102747194A (en) * | 2012-07-18 | 2012-10-24 | 河南通宇冶材集团有限公司 | Fluoride-free environmental-friendly slag dilution solvent for electric furnace, converter and medium frequency furnace and preparation method of fluoride-free environmental-friendly slag dilution solvent |
| CN102747194B (en) * | 2012-07-18 | 2014-10-15 | 河南通宇冶材集团有限公司 | Fluoride-free environmental-friendly slag dilution solvent for electric furnace, converter and medium frequency furnace and preparation method of fluoride-free environmental-friendly slag dilution solvent |
| 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 |
| CN104342533B (en) * | 2013-07-31 | 2016-04-06 | 沈阳铸造研究所 | A kind of smelting special slag former containing active element steel and preparation method thereof |
| CN104342533A (en) * | 2013-07-31 | 2015-02-11 | 沈阳铸造研究所 | Special slag forming agent for smelting steel containing active elements and preparation method thereof |
| CN103451374A (en) * | 2013-09-22 | 2013-12-18 | 新疆中合大正商贸有限公司 | Production process of aluminium slag adjusting agent for LF refining furnace |
| CN104046747A (en) * | 2013-10-19 | 2014-09-17 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Medium and low carbon steel, molten steel refining flux of medium and low carbon steel, preparation method of steel, and preparation method of flux |
| CN104232845A (en) * | 2014-09-03 | 2014-12-24 | 浙江瑞浦科技有限公司 | Argon oxygen decarburization (AOD) slag-making method during smelting of sulfur-containing free-cutting stainless steel |
| CN106337101A (en) * | 2016-11-11 | 2017-01-18 | 攀钢集团攀枝花钢铁研究院有限公司 | Calcium series top slag modification agent and application method thereof |
| CN110106311A (en) * | 2019-05-16 | 2019-08-09 | 中天钢铁集团有限公司 | It is a kind of to reduce the refining slag control technique corroded resistance to material |
| CN112011669A (en) * | 2019-05-29 | 2020-12-01 | 宝山钢铁股份有限公司 | Molten iron slag modifier |
| CN111485063A (en) * | 2020-06-06 | 2020-08-04 | 内蒙古铧钰环保材料有限公司 | High-efficiency utilization process of aluminum ash in electrolytic aluminum plant |
| CN111996335A (en) * | 2020-09-10 | 2020-11-27 | 河北工程大学 | Core-spun yarn core powder composition for high-aluminum steel production and processing method |
| CN114150108A (en) * | 2021-12-03 | 2022-03-08 | 商丘市商鼎耐火材料有限公司 | High-aluminum slag modifier for refining and using aluminum ash as raw material and using method thereof |
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| Publication number | Publication date |
|---|---|
| CN101519712B (en) | 2011-01-05 |
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