CN104946850A - Converter tapping slag washing method using low-Al alumina ball - Google Patents
Converter tapping slag washing method using low-Al alumina ball Download PDFInfo
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- CN104946850A CN104946850A CN201510323854.8A CN201510323854A CN104946850A CN 104946850 A CN104946850 A CN 104946850A CN 201510323854 A CN201510323854 A CN 201510323854A CN 104946850 A CN104946850 A CN 104946850A
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Abstract
The invention discloses a converter tapping slag washing method using a low-Al alumina ball, and belongs to the technical field of a converter tapping slag washing technology. In the tapping process, a ladle bottom blowing argon system is started, and the flow of argon is controlled to range from 300 NL/min to 1200 NL/min; when the tapping amount accounts for 25% to 35% of the total amount, white ash and the low-Al alumina ball are added; and when refining is arrived, according to requirements of different steel type components, the temperature of arrived molten steel and a molten slag condition, a slag material and a deoxidizing agent are adjusted, and then temperature rising and subsequent molten steel treatment are carried out. The method has the beneficial effects that the slag washing manner of the white ash and the low-Al alumina ball is adopted, and the requirements that a refining arrival slag melting point is lowered, the slag fluidity is improved, the slagging speed is increased, the slag making time is shortened, the slag inclusion adsorption capacity is improved, and the comprehensive slag making cost is reduced are met.
Description
Technical field
The invention belongs to converter tapping deslagging process technical field, particularly a kind of converter tapping uses low Al alumina balls wash heat method.Especially to reduction converter slag washery slag system fusing point, improve refining and to arrive at a station slag conditions, shorten the refining slag time, improve inclusion adsorptive power, reduce comprehensive cost and have and improve effect greatlyr.
Background technology
Along with the lasting weakness of steel market situation, constantly reduce production cost, Improving The Quality of Products becomes each big steel enterprise top priority.Wash heat is as the outer treatment process of a kind of stove, and have cost low, the features such as slagging is fast, are the simple effective means obtaining ladle refining slag fast, effectively can remove and be mingled with cleaning molten steel.Its basic technology method is in tapping process, add wash heat material, and rely on good ladle bottom blowing to stir and the stirring of steel stream, the wash heat material dissolved rapidly can be made fully to contact with molten steel, liquid wash heat feed liquid is dripped and can be combined with deoxidation products immediately, adsorb also floating upward quickly eliminating, the object realizing cleaning molten steel, improve steel quality, improve fluidity molten steel.The domestic and international research for converter tapping deslagging process is more at present, but the relevant report that the alumina balls more cheap to employing price carry out wash heat is less.
Publication number is that the Chinese patent of CN 101235431A discloses a kind of convertor tapping washing fining furnace fast desulfurization method.The method mainly adopts the proportioning mode of pre-melted slag and lime to carry out wash heat.Comprise ladle wash heat and LF stove refining two steps.Special feature is: the lime adding pre-melted slag and 3-5kg/t in ladle wash heat step according to the ratio of 7-12Kg/t; Add pre-melted slag according to the ratio of 3-5kg/t in LF stove refinement step, and add slag former according to following ratio: lime 3-5kg/t, calcium carbide 2-4kg/t, ferrosilicon powder 2-4kg/t.The method is not suitable for the weak deoxidization technique condition of converter, and does not relate to the proportioning mode adopting alumina balls.
Publication number is that the Chinese patent of CN 101139644A discloses a kind of high-basicity refining slag for slag washing of revolving furnace steel-making.A kind of wash heat material that this refining slag is made up of active ash, fluorite and calcined soda for industry.It has higher basicity, dual alkalinity >=23.3.But the method mainly adopts fluorite as its dissolving agent, its higher fluorite has comparatively severe corrosive to resistance to material, and Al
2o
3content is on the low side, 0 < Al
2o
3≤ 4.5%.With wash heat material in this paper, there is bigger difference.
Publication number is that the Chinese patent of CN 1962888A discloses a kind of ladle slag modified aluminium slag pellet.Its objective is the proterties of ladle slag when molten steel is carried out to Alloying Treatment and improves refining treatment.This patent its be mainly used in the proterties that RH stove improves ladle slag, and it is mainly a kind of high alumina aluminium slag ball.Wash heat process smoke level is large, is not suitable for converter wash heat.Have to strengthen with the low aluminum aluminum oxide ball carried herein and distinguish.
Publication number be CN 1410556A, CN 1521279A etc. its be a kind of preparation method, do not relate to technique using method and reference mark.And be high Al class, be different from content described herein.
In document, " application of aluminium slag ball on LF refining furnace " only points out its use in refining LF smelting process, does not relate to converter tapping and uses.Other documents relate generally to aluminium slag ball preparation method, do not use to make to technique to illustrate.
By to the Patents of domestic alumina balls or aluminium slag ball and literature search known, current alumina balls mainly use for refining process, do not relate to converter tapping and use.Major part is mainly for its preparation method simultaneously, not mentioned concrete technology using method.And alumina balls are high aluminium ball, use at converter tapping process and there is larger restriction.
Based on above reason, this patent proposes a kind of for adopting low aluminum aluminum oxide ball to carry out the method for wash heat, achieves low cost, low melting point, floride-free deslagging process.
Summary of the invention
The object of the present invention is to provide a kind of converter tapping to use low Al alumina balls wash heat method, solve the problems such as original wash heat condition is poor, cost is high, resistance to material corrosion.
Basic technology route is: converter smelting-wash heat-ladle furnace refining-(RH vacuum refinement)-sheet billet continuous casting.Concrete steps and parameter as follows:
1), in tapping process, open ladle bottom blowing argon gas system, argon flow amount controls at 300-1200NL/min.
2) when tap reaches the 25%-35% of total amount, lime and low Al alumina balls are added; Lime: low Al alumina balls are 1.5-4.0; Wherein in low Al alumina balls: Al≤5wt%, ∑ (Al+Al
2o
3)>=70wt%, SiO
2≤ 5wt%, pressure ball is of a size of 40 ± 10mm.
3) refining is arrived at a station, and requires, arrive at a station liquid steel temperature, slag conditions etc. according to different steel grade compositions, regulates slag charge and reductor, then carries out heating up and follow-up steel treatment.Concrete control is as follows:
General carbon not Aluminum steel: after molten steel arrives at a station, after carrying out the sampling of blowing argon gas 3min thermometric, carries out hyperthermic treatment, adopts 9/1 grade of 1minization slag; Turn 3/4 grade of intensification.Molten steel can suitably regulate lime and fluorite, fluorite total amount≤0.6kg/t steel according to change slag situation in treating processes.
General carbon Aluminum steel: after molten steel arrives at a station, after carrying out the sampling of blowing argon gas 3min thermometric, carries out hyperthermic treatment, adopt 9/1 grade of 1minization slag, turn 6/1 grade of 2minization slag, then turn 3/4 grade of intensification, lime and fluorite can be suitably regulated, fluorite total amount≤0.6kg/t steel according to change slag situation in process.
Low-sulfur and aluminum-containing steel: after molten steel arrives at a station, after carrying out the sampling of blowing argon gas 3min thermometric, when molten steel arrives at a station temperature >=1570 DEG C, adds lime 3.0-5.0kg/t steel, fluorite 0.3-0.5kg/t steel, aluminum shot 0.3-0.5kg/t steel.When molten steel arrives at a station temperature < 1570 DEG C, first heat up.Adopt 9/1 grade of 2minization slag, turn 6/1 grade of 2minization slag, then turn 3/4 grade of intensification, in process, can suitably regulate lime and fluorite, fluorite total amount≤1.0kg/t steel according to change slag situation.
The invention has the advantages that:
1, the wash heat slag system fusing point of joining is low, and the quantity of slag is large.Effectively can improve refining to arrive at a station slag conditions, shortening slag making in early stage and change slag time.
2, use this technology, the dissolving agents such as part fluorite, bauxitic clay can be replaced with the low aluminum aluminum oxide ball of relative low price, the erosion effectively reducing the overall slag making cost of refinery practice and reduce the resistance to material of ladle.
3, because this slag system mobility is better, the Al simultaneously containing 18-25% in slag system
2o
3, this slag system effectively can promote that the floating of foreign substance in molten steel absorbs, and is conducive to improving Molten Steel Cleanliness.
Embodiment
Embodiment 1
XxxQ00162 heat, not Aluminum steel kind A ship steel, the operational path of employing is: converter smelting-wash heat-ladle furnace refining-sheet billet continuous casting.
Converter smelting: endpoint carbon content of converter [C]=0.125%, final sulfur content [S]=0.0137%, terminal temperature T=1655 DEG C; Tapping adopts weak deoxidation and pushing off the slag operation.
Wash heat: when tap reaches 30% of total amount, adds lime 5.06kg/t steel, low Al alumina balls 1.5kg/t steel.
Ladle furnace refining: refining is arrived at a station ladle argon-blown 3min, argon flow amount 800NL/min.Thermometric 1567 DEG C, enters and adds thermal potential process, adopts 9/1 grade to change slag 1min.Turn 3/4 grade of intensification 15min.Process adds lime 214kg, fluorite 25kg.
On general effect, cost is comparatively with watering time reduction by 0.4 yuan/ton, and slag making time shorten 4min, slag mobility experience index is CaO/Al
2o
3be 3.25, meet within the scope of 2.4-3.6.Center segregation is C class 1.5.
Embodiment 2
XxxN00107 heat, containing aluminium straight carbon steel B-S, the operational path of employing is: converter smelting-wash heat-ladle furnace refining-sheet billet continuous casting.
Converter smelting: endpoint carbon content of converter [C]=0.112wt%, final sulfur content [S]=0.0225%, terminal temperature T=1652 DEG C; Tapping adopts weak deoxidation and pushing off the slag operation.
Wash heat: tap reach total amount three/for the moment, add lime 4.82kg/t steel, low Al alumina balls 2.00kg/t steel.
Ladle furnace refining: refining is arrived at a station ladle argon-blown 3min, argon flow amount 800NL/min.Thermometric 1558 DEG C, adopts 9/1 grade to change slag 1min, turns 6/1 grade and changes slag 2min, then turn 3/4 grade of (magnitude of voltage 169v) intensification 10min.Process adds lime 5.56kg/t steel, aluminum shot 45kg/t steel, ferro-aluminum 1.36kg/t steel.Fluorite 0.46kg/t steel.
On general effect, cost is comparatively with watering time reduction by 1.4 yuan/ton, and slag making time shorten 3min, slag mobility experience index is CaO/Al
2o
3be 2.52, meet within the scope of 2.4-3.6.Center segregation is C class 1.5.
Embodiment 3
Xxx Q00112 heat, containing aluminium low-sulfur steel S355G8+M, the operational path of employing is: converter smelting-wash heat-ladle furnace refining-RH vacuum refinement-sheet billet continuous casting.
Converter smelting: endpoint carbon content of converter [C]=0.039%, final sulfur content [S]=0.0226%, terminal temperature T=1667 DEG C; Tapping adopts strong deoxidation and pushing off the slag operation.
Wash heat: tap reach total amount three/for the moment, add lime 4.12kg/t steel, low Al alumina balls 2.00kg/t steel.Ferro-aluminum 4.70kg/t steel.
Ladle furnace refining: refining is arrived at a station ladle argon-blown 3min, argon flow amount 800NL/min.Thermometric 1555 DEG C.Regulate dissolving agent and aluminum shot.Fluorite 0.60-1.00kg/t steel.Enter and add thermal potential process, adopt 9/1 grade to change slag 2min, turn 6/1 grade and change slag 2min (magnitude of voltage 146v), then turn 3/4 grade of intensification 31min, procedure regulation lime 16.77kg/t steel, fluorite 0.89kg/t steel, aluminum shot 0.91kg/t steel, ferro-aluminum 1.24kg/t steel.
On general effect, cost is comparatively with watering time reduction by 0.9 yuan/ton, and slag making time shorten 2min, slag mobility experience index is CaO/Al
2o
3be 2.52, meet within the scope of 2.4-3.6.Center segregation is C class 0.5.This waters time B inclusion and is slightly and is carefully be 0.5 to the maximum.
Claims (2)
1. converter tapping uses a low Al alumina balls wash heat method, and operational path is: converter smelting-wash heat-ladle furnace refining-RH vacuum refinement-sheet billet continuous casting; It is characterized in that, concrete steps and parameter as follows:
1), in tapping process, open ladle bottom blowing argon gas system, argon flow amount controls at 300-1200NL/min;
2) when tap reaches the 25%-35% of total amount, lime and low Al alumina balls are added; Lime: low Al alumina balls are 1.5-4.0;
3) refining is arrived at a station, and according to the requirement of different steel grade compositions, the liquid steel temperature that arrives at a station, slag conditions, regulates slag charge and reductor, then carries out heating up and follow-up steel treatment; Concrete control is as follows:
General carbon not Aluminum steel: after molten steel arrives at a station, after carrying out the sampling of blowing argon gas 3min thermometric, carries out hyperthermic treatment, adopts 9/1 grade of 1minization slag; Turn 3/4 grade of intensification; Molten steel is fluorite total amount≤0.6kg/t steel in treating processes;
General carbon Aluminum steel: after molten steel arrives at a station, after carrying out the sampling of blowing argon gas 3min thermometric, carries out hyperthermic treatment, adopts 9/1 grade of 1minization slag, turn 6/1 grade of 2minization slag, then turn 3/4 grade of intensification, fluorite total amount≤0.6kg/t steel in process;
Low-sulfur and aluminum-containing steel: after molten steel arrives at a station, carries out the sampling of blowing argon gas 3min thermometric, when molten steel arrives at a station temperature >=1570 DEG C, adds lime 3.0-5.0kg/t steel, fluorite 0.3-0.5kg/t steel, aluminum shot 0.3-0.5kg/t steel; When molten steel arrives at a station temperature < 1570 DEG C, first heat up; Adopt 9/1 grade of 2minization slag, turn 6/1 grade of 2minization slag, then turn 3/4 grade of intensification, fluorite total amount≤1.0kg/t steel in process.
2. method according to claim 1, is characterized in that, step 2) described in low Al alumina balls in Al≤5wt%, ∑ (Al+Al
2o
3)>=70wt%, SiO
2≤ 5wt%, pressure ball is of a size of 40 ± 10mm.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105648150A (en) * | 2016-03-30 | 2016-06-08 | 首钢总公司 | Method for using bauxite slag washing process in converter steel tapping |
| CN114318113A (en) * | 2021-12-17 | 2022-04-12 | 扬州恒润海洋重工有限公司 | Slag washing direct-upward continuous casting production process of hot rolled steel converter |
| CN114672610A (en) * | 2022-04-11 | 2022-06-28 | 广东韶钢松山股份有限公司 | HRB400E steel washing bag treatment method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1410556A (en) * | 2002-10-17 | 2003-04-16 | 江苏江南铁合金有限公司 | Aluminium slag ball and its preparation method |
| CN101748236A (en) * | 2008-12-15 | 2010-06-23 | 鞍钢股份有限公司 | Method for controlling titanium component content in molten steel |
| CN103233098A (en) * | 2013-05-13 | 2013-08-07 | 涟源市飞达冶金炉料厂 | Novel direct slag-feeding washing mixed material application method in converter tapping process |
-
2015
- 2015-06-13 CN CN201510323854.8A patent/CN104946850B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1410556A (en) * | 2002-10-17 | 2003-04-16 | 江苏江南铁合金有限公司 | Aluminium slag ball and its preparation method |
| CN101748236A (en) * | 2008-12-15 | 2010-06-23 | 鞍钢股份有限公司 | Method for controlling titanium component content in molten steel |
| CN103233098A (en) * | 2013-05-13 | 2013-08-07 | 涟源市飞达冶金炉料厂 | Novel direct slag-feeding washing mixed material application method in converter tapping process |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105648150A (en) * | 2016-03-30 | 2016-06-08 | 首钢总公司 | Method for using bauxite slag washing process in converter steel tapping |
| CN114318113A (en) * | 2021-12-17 | 2022-04-12 | 扬州恒润海洋重工有限公司 | Slag washing direct-upward continuous casting production process of hot rolled steel converter |
| CN114672610A (en) * | 2022-04-11 | 2022-06-28 | 广东韶钢松山股份有限公司 | HRB400E steel washing bag treatment method |
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| CN104946850B (en) | 2017-12-15 |
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Effective date of registration: 20190325 Address after: 063200 Iron and Steel Power Park, Caofeidian Industrial Zone, Tangshan City, Hebei Province Patentee after: Shougang Jingtang Steel & Iron United Co., Ltd. Address before: 066326 Du Zhuang Township, Funing County, Qinhuangdao, Hebei Patentee before: Qinhuangdao Shouqin Metal Material Co., Ltd. |
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