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CN103484593A - Smelting method for increasing manganese content in molten steel at end point of small converter - Google Patents

Smelting method for increasing manganese content in molten steel at end point of small converter Download PDF

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Publication number
CN103484593A
CN103484593A CN201310478304.4A CN201310478304A CN103484593A CN 103484593 A CN103484593 A CN 103484593A CN 201310478304 A CN201310478304 A CN 201310478304A CN 103484593 A CN103484593 A CN 103484593A
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molten iron
primary converter
converter
smelting
content
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CN103484593B (en
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李明
陶镳
胡道峰
翟卫江
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Nanjing Iron and Steel Co Ltd
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Nanjing Iron and Steel Co Ltd
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Abstract

The invention relates to a smelting method for increasing manganese content in molten steel at the end point of a small converter. The smelting method comprises the steps of firstly, controlling slag formation conditions at the initial smelting stage of the small converter; secondly, controlling conditions in the converter after slag is formed in the converter, and meanwhile, raising the temperature; thirdly, adding manganese ores in batches at the middle smelting stage of the small converter, and meanwhile, controlling smelting conditions; fourthly, controlling conditions in the converter before the middle smelting stage of the small converter is ended; fifthly, controlling smelting conditions at the later smelting stage of the small converter; sixthly, controlling conditions in the converter at the smelting end point of the small converter, and meanwhile, carrying out catch carbon operation; seventhly, ending the smelting of the small converter. A process for directly adding the manganese ores on the small converter can be effectively implemented according to the characteristics of the small converter.

Description

Improve the smelting process of primary converter endpoint molten steel manganese content
Technical field
The present invention relates to a kind of smelting molten steel method, especially a kind of smelting process that improves primary converter endpoint molten steel manganese content, be specially adapted for primary converter.
Background technology
At present in the field of business have two kinds usually by the method for manganese element alloying, and the first is first to utilize manganese ore to produce the including Mn-Fe alloy, then in including Mn-Fe ladle refining ladle, to improve endpoint molten steel manganese content; The second is directly manganese ore to be added in converter and carry out alloying.Facts have proved, second method is better than first method, can not only reduce the iron alloy consumption, reduces costs, and shortens flow process, energy-saving and emission-reduction, and the manganese ore of can also usining replaces iron ore as oxygenant, also can be used as refrigerant in order to temperature adjustment.
Manganese element is a large amount of oxidations of initial stage quilt in converter, but tend to balance in smelting later stage oxidation, and along with the oxidation of carbon, in slag, FeO content reduces, and MnO is reduced, and metal M n enters in molten steel; Improve converter terminal molten steel manganese content and can reduce the ferromanganese consumption, be conducive to reduce the STEELMAKING PRODUCTION cost; Along with the raising of endpoint molten steel manganese content, molten steel oxidation decline, the slag desulfurization rate improves, thereby improves Molten Steel Cleanliness.
According to the knowledge of the applicant, the manganese ore of China 95% is the poor manganese ore that manganese content is lower, has seriously restricted the effect that directly adds manganese ore, mostly by improving technique, improves effect at present, and the method that makes directly to add manganese ore can practice and extension.
For example, Steelmaking Plant In Baoshan Iron And Steel Works adopts " three is de-" (being desulfurization, dephosphorization, desiliconization) molten iron to carry out less slag blowing, and simultaneously with addition of manganese ore, the manganese ore manganese content is 34%~36%; Unslaked lime unit consumption 11.3kg/ts, light dolomite unit consumption 6.3kg/ts, converter quantity of slag 30kg/ts, be 1/3 of the conventional quantity of slag; Add manganese ore and be greater than 8kg/ts, in the situation that blocking content is blown in converter, be greater than 0.08%, the recovery rate of manganese is greater than 50%.
For another example, Steelmaking Project factory had once carried out adding manganese ore test in its No. 1 converter, and the manganese ore manganese content is 27%, and every stove 200kg once adds in stove opening while blowing, and because add-on is few, end point carbon is low, the quantity of slag is large, the Mn rate of recovery only has 28%, need to make further improvements.By molten iron " three is de-", Less Slag Steelmaking in Converter, improve endpoint carbon content afterwards, and after final manganese ore alloying, the rate of recovery of Mn reaches more than 75%.
And for example, Chinese invention patent application (the title: a kind of technique of performing manganese ore alloying by converter less-slag melting) of application number 201010183481.6 application notification number CN101880743A, reduce the quantity of slag by converter deslagging midway, the smelting initial stage adds manganese ore 1kg/t-2.5kg/t, reduce the converter steelmaking process quantity of slag, pour out slag midway more than 50%, adopt the technique of high catch carbon during tapping, carbon content control is more than 0.08%, and air supply intensity is at 0.03-0.3Nm 3/ mint, the poor manganese ore recovery rate reaches more than 40%.
Yet, because primary converter does not possess the condition of molten iron " three de-", two slag melting, top bottom blowing, above-mentioned technique all can't be directly applied for primary converter, and the applicant also finds specially directly to add manganese ore technique for primary converter.
Summary of the invention
Technical problem to be solved by this invention is, the problem existed for prior art, propose a kind of smelting process that improves primary converter endpoint molten steel manganese content, specially for the primary converter characteristics, can be on primary converter effectively enforcement directly add the technique of manganese ore.
The technical scheme that the present invention solves its technical problem is as follows:
A kind of smelting process that improves primary converter endpoint molten steel manganese content, is characterized in that, comprises the following steps:
The first step, at primary converter, smelt the initial stage, in molten iron in stove, add slag material; Described slag material comprises lime and light dolomite, and add-on is respectively lime 20-30kg/t molten iron, light dolomite 5-10kg/t molten iron; Keep oxygen pressure is 0.8-0.9Mpa simultaneously, and keeping the oxygen lance position height is 800-900mm;
Second step, after slagging in stove, add lime 10-15kg/t molten iron immediately in molten iron in stove, and control molten iron temperature and rise gradually;
The 3rd step, at primary converter, smelt mid-term, after completing in the silicomanganese reaction period, carbon starts the stage that vigorous oxidation, molten iron temperature rise rapidly, and minutes at least 2 batches add manganese ore, and the total amount that adds of manganese ore is the 6-8kg/t molten iron; Keep the oxygen lance position height is 1000-1400mm simultaneously, while adjusting the oxygen lance position height, adjusts gradually;
The 4th step, before the distance primary converter is smelted and to be finished at least 8min mid-term, add lime 10-15kg/t molten iron in stove, and light dolomite 5-20kg/t molten iron;
The 5th step, at primary converter, smelt the later stage, oxygen pressure is brought up to at least 0.9Mpa gradually, the oxygen lance position height is down to gradually minimum spacing simultaneously;
The 6th step, at the primary converter smelting endpoint, the oxygen rifle blows the time deeply for 15s at least; The operation of enforcement catch carbon, make carbon content >=weight percentage 0.1% in endpoint molten steel, makes oxygen level reduce 50-100ppm, and manganese content reaches weight percentage 0.11-0.13%; Make finishing slag MnO content raise, FeO content reduces simultaneously, and to make finishing slag basicity be 3-5; Controlling terminal temperature is 1640 ℃-1680 ℃;
The 7th step, primary converter are smelted and are finished.
The present invention further perfect technical scheme is as follows:
Preferably, in the 3rd step, the manganese ore manganese content is weight percentage 15-30%.
More preferably, manganese ore is weight percentage 5-20% containing the Fe amount, containing SiO 2amount is weight percentage 5-20%, P content≤weight percentage 0.035%, and containing S amount≤weight percentage 0.02%, water content≤weight percentage 1.0%; The granularity of manganese ore is 20-40mm.
Preferably, in the first step, lime adding amount is the 20kg/t molten iron, and the light dolomite add-on is the 8kg/t molten iron, and oxygen pressure is 0.8Mpa, and the oxygen lance position height is 800mm;
In second step, lime adding amount is the 15kg/t molten iron;
In the 3rd step, after primary converter is smelted and to be started 3min mid-term, minutes at least 2 batches add the manganese ore that total amount is the 8kg/t molten iron;
In the 4th step, before the distance primary converter is smelted and to be finished 8min mid-term, in stove, add lime 15kg/t molten iron, and light dolomite 20kg/t molten iron;
In the 5th step, oxygen pressure progressively is increased to 0.9Mpa;
In the 6th step, the time of blowing is 15s to the oxygen rifle deeply.
Preferably, controlling temperature at the primary converter smelting initial stage is 1400 ℃-1450 ℃, smelts at primary converter that to control temperature mid-term be 1560 ℃-1600 ℃, and smelting the later stage at primary converter, to control temperature be 1640 ℃-1680 ℃.
Key point of the present invention is: the above-mentioned specified phase that (1) smelts mid-term at primary converter adds manganese ore, can take full advantage of slag and start easily to return dry opportunity, and the manganese element in poor manganese ore is more easily entered in molten iron, finally makes endpoint molten steel manganese content increase; (2) control respectively smelting condition in stove each period of smelting at primary converter, especially at terminal, implement the catch carbon operation, can effectively promote that the manganese element in manganese ore enters in molten iron, obtain good result.
Beneficial effect of the present invention is:
(1), specially for the primary converter characteristics, making directly to add manganese ore technique can be achieved on primary converter.
(2) smelt and add the alternative iron ore dissolving agent of manganese ore mid-term at primary converter, change the slag better effects if, can not produce the metal splash, the finishing slag good fluidity, can reduce the deoxygenated alloy consumption, reduces smelting cost; In addition, manganese ore also alternative iron ore adjust tapping temperature as refrigerant.
(3) smelt and add manganese ore can effectively improve finishing slag MnO content mid-term at primary converter, thereby increase reducible manganese element amount, be conducive to increase endpoint molten steel manganese content, reduce the endpoint molten steel oxygen level, improve steel quality; Can further reduce FeO content and oxygen level in finishing slag, slow down the erosion of slag to furnace lining, reduce iron and steel stock consumption, improve Molten Steel Cleanliness simultaneously.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail.But the invention is not restricted to given example.
Embodiment
The smelting process that the present embodiment improves primary converter endpoint molten steel manganese content comprises the following steps:
The first step, at primary converter, smelt the initial stage, in molten iron in stove, add slag material; Described slag material comprises lime and light dolomite, and add-on is respectively lime 20-30kg/t molten iron (preferably 20kg/t molten iron), light dolomite 5-10kg/t molten iron (preferably 8kg/t molten iron); Keep oxygen pressure is the preferred 0.8Mpa of 0.8-0.9Mpa(simultaneously), keeping the oxygen lance position height is the preferred 800mm of 800-900mm();
Second step, after slagging in stove, add lime 10-15kg/t molten iron (preferably 15kg/t molten iron) immediately in molten iron in stove, and control molten iron temperature and rise gradually;
The 3rd step, at primary converter, smelt mid-term, after completing in the silicomanganese reaction period, carbon starts vigorous oxidation, rapid stage of rising of molten iron temperature (after preferably primary converter is smelted and started 3min mid-term), divide at least 2 batches and add manganese ore, the total amount that adds of manganese ore is 6-8kg/t molten iron (preferably 8kg/t molten iron); Keep the oxygen lance position height is 1000-1400mm simultaneously, adjusts gradually (forbidding the rifle position to rise and fall sharply and quickly) while adjusting the oxygen lance position height;
The manganese ore manganese content is weight percentage 15-30%, containing the Fe amount, is weight percentage 5-20%, containing SiO 2amount is weight percentage 5-20%, P content≤weight percentage 0.035%, and containing S amount≤weight percentage 0.02%, water content≤weight percentage 1.0%; The granularity of manganese ore is 20-40mm;
The 4th step, at the distance primary converter, smelt and to finish at least preferred 8min of 8min(mid-term) before, in stove, add lime 10-15kg/t molten iron (preferably 15kg/t molten iron), and light dolomite 5-20kg/t molten iron (preferably 20kg/t molten iron);
The 5th step, at primary converter, smelt the later stage, oxygen pressure brought up to at least preferred 0.9Mpa of 0.9Mpa(gradually), the oxygen lance position height is down to gradually minimum spacing simultaneously;
The 6th step, at the primary converter smelting endpoint, the oxygen rifle blows the time deeply for the preferred 15s of 15s(at least) (should strengthen melting bath stirring) simultaneously; The operation of enforcement catch carbon, make carbon content >=weight percentage 0.1% in endpoint molten steel, makes oxygen level reduce 50-100ppm, and manganese content reaches weight percentage 0.11-0.13%; Make finishing slag MnO content raise, FeO content reduces simultaneously, and to make finishing slag basicity be 3-5; Controlling terminal temperature is 1640 ℃-1680 ℃;
The 7th step, primary converter are smelted and are finished.
In addition, controlling temperature at the primary converter smelting initial stage is 1400 ℃-1450 ℃, smelts at primary converter that to control temperature mid-term be 1560 ℃-1600 ℃, and smelting the later stage at primary converter, to control temperature be 1640 ℃-1680 ℃.
Application case:
3 of oxygen top blown primary converters, tap 40t, smelting cycle 25min, pure oxygen blow duration 13min.Slag material is lime, light dolomite, return mine/manganese ore, iron scale etc.Deoxygenated alloy adopts ferrosilicon, ferromanganese, aluminium manganese, calcium carbide etc.
Nascent slag is mainly used FeO, SiO 2, and a small amount of MnO form, when block lime contacts with nascent slag, because slag and lime infiltrate, slag will enter pore and the crackle on lime surface.Form high melting compound 2CaOSiO on the lime block surface 2(C2S phase region) and 3CaOSiO 2(C3S phase region) tectum, they separate lime block and slag, and the lime dissolution rate is slowed down.Improve MnO content, be conducive to the CaO saturation solubility and improve, (C2S+L) two-phase region dwindles, tectum attenuation, lime enhanced dissolution rate.Increase MnO in slag and there is good ensured sustained development slag effect.
Use manganese ore, in slag, FeO reduces by a relatively large margin, contributes to improve the alloy material specific absorption and slows down lining erosion, improves the finishing slag mobility, makes to spatter slag and holds up the stove effect to make moderate progress.
Adopt the present embodiment method in this application case after, in the 6th step, endpoint molten steel manganese content reaches weight percentage 0.126%; The rate of recovery of manganese ore alloying Mn can reach more than 37%, respond well; And in endpoint molten steel, manganese content improves 0.1%, in endpoint molten steel, oxygen level reduces 18ppm.
In addition to the implementation, the present invention can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of requirement of the present invention.

Claims (5)

1. a smelting process that improves primary converter endpoint molten steel manganese content, is characterized in that, comprises the following steps:
The first step, at primary converter, smelt the initial stage, in molten iron in stove, add slag material; Described slag material comprises lime and light dolomite, and add-on is respectively lime 20-30kg/t molten iron, light dolomite 5-10kg/t molten iron; Keep oxygen pressure is 0.8-0.9Mpa simultaneously, and keeping the oxygen lance position height is 800-900mm;
Second step, after slagging in stove, add lime 10-15kg/t molten iron immediately in molten iron in stove, and control molten iron temperature and rise gradually;
The 3rd step, at primary converter, smelt mid-term, after completing in the silicomanganese reaction period, carbon starts the stage that vigorous oxidation, molten iron temperature rise rapidly, and minutes at least 2 batches add manganese ore, and the total amount that adds of manganese ore is the 6-8kg/t molten iron; Keep the oxygen lance position height is 1000-1400mm simultaneously, while adjusting the oxygen lance position height, adjusts gradually;
The 4th step, before the distance primary converter is smelted and to be finished at least 8min mid-term, add lime 10-15kg/t molten iron in stove, and light dolomite 5-20kg/t molten iron;
The 5th step, at primary converter, smelt the later stage, oxygen pressure is brought up to at least 0.9Mpa gradually, the oxygen lance position height is down to gradually minimum spacing simultaneously;
The 6th step, at the primary converter smelting endpoint, the oxygen rifle blows the time deeply for 15s at least; The operation of enforcement catch carbon, make carbon content >=weight percentage 0.1% in endpoint molten steel, makes oxygen level reduce 50-100ppm, and manganese content reaches weight percentage 0.11-0.13%; Make finishing slag MnO content raise, FeO content reduces simultaneously, and to make finishing slag basicity be 3-5; Controlling terminal temperature is 1640 ℃-1680 ℃;
The 7th step, primary converter are smelted and are finished.
2. improve according to claim 1 the smelting process of primary converter endpoint molten steel manganese content, it is characterized in that, in the 3rd step, the manganese ore manganese content is weight percentage 15-30%.
3. improve according to claim 2 the smelting process of primary converter endpoint molten steel manganese content, it is characterized in that, manganese ore is weight percentage 5-20% containing the Fe amount, containing SiO 2amount is weight percentage 5-20%, P content≤weight percentage 0.035%, and containing S amount≤weight percentage 0.02%, water content≤weight percentage 1.0%; The granularity of manganese ore is 20-40mm.
4. according to the smelting process of claim 1 or 2 or 3 described raising primary converter endpoint molten steel manganese content, it is characterized in that, in the first step, lime adding amount is the 20kg/t molten iron, the light dolomite add-on is the 8kg/t molten iron, and oxygen pressure is 0.8Mpa, and the oxygen lance position height is 800mm;
In second step, lime adding amount is the 15kg/t molten iron;
In the 3rd step, after primary converter is smelted and to be started 3min mid-term, minutes at least 2 batches add the manganese ore that total amount is the 8kg/t molten iron;
In the 4th step, before the distance primary converter is smelted and to be finished 8min mid-term, in stove, add lime 15kg/t molten iron, and light dolomite 20kg/t molten iron;
In the 5th step, oxygen pressure progressively is increased to 0.9Mpa;
In the 6th step, the time of blowing is 15s to the oxygen rifle deeply.
5. according to the smelting process of claim 1 or 2 or 3 described raising primary converter endpoint molten steel manganese content, it is characterized in that, controlling temperature at the primary converter smelting initial stage is 1400 ℃-1450 ℃, smelt at primary converter that to control temperature mid-term be 1560 ℃-1600 ℃, smelting the later stage at primary converter, to control temperature be 1640 ℃-1680 ℃.
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CN105543440A (en) * 2015-12-30 2016-05-04 武钢集团昆明钢铁股份有限公司 Decarbonization and manganese conservation converter smelting method for high manganese molten iron
CN106148629A (en) * 2015-03-28 2016-11-23 鞍钢股份有限公司 Method for controlling manganese content of high-manganese molten iron end point
CN108396093A (en) * 2017-02-05 2018-08-14 鞍钢股份有限公司 Method for improving residual manganese content of molten steel at converter end point
CN109161633A (en) * 2018-09-30 2019-01-08 武钢集团昆明钢铁股份有限公司 Manganese high phosphorus hot metal proposes the preparation method that carbon protects manganese in a kind of converter smelting
CN109385503A (en) * 2018-12-06 2019-02-26 云南玉溪仙福钢铁(集团)有限公司 It protects carbon and protects manganese converter steelmaking process
CN109666775A (en) * 2018-11-16 2019-04-23 九江萍钢钢铁有限公司 A kind of blast furnace labour quick smelting process of converter
CN110527785A (en) * 2019-10-10 2019-12-03 攀钢集团攀枝花钢铁研究院有限公司 Half steel less-slag melting converter manganese ore direct alloying technique technique
CN110616290A (en) * 2019-09-30 2019-12-27 山东钢铁股份有限公司 Converter single slag remaining smelting method capable of reducing final slag height
CN111534660A (en) * 2020-05-22 2020-08-14 山东钢铁股份有限公司 Method for improving manganese element in molten steel at converter end point
CN112853026A (en) * 2021-01-06 2021-05-28 鞍钢股份有限公司 Manganese alloying method for smelting high manganese steel by converter

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CN106148629A (en) * 2015-03-28 2016-11-23 鞍钢股份有限公司 Method for controlling manganese content of high-manganese molten iron end point
CN105543440B (en) * 2015-12-30 2017-06-16 武钢集团昆明钢铁股份有限公司 A kind of carbon elimination of ferromanganese water high protects manganese converter smelting method
CN105543440A (en) * 2015-12-30 2016-05-04 武钢集团昆明钢铁股份有限公司 Decarbonization and manganese conservation converter smelting method for high manganese molten iron
CN108396093A (en) * 2017-02-05 2018-08-14 鞍钢股份有限公司 Method for improving residual manganese content of molten steel at converter end point
CN109161633B (en) * 2018-09-30 2020-03-20 武钢集团昆明钢铁股份有限公司 Preparation method for extracting carbon from medium-manganese high-phosphorus iron water and protecting manganese in converter smelting
CN109161633A (en) * 2018-09-30 2019-01-08 武钢集团昆明钢铁股份有限公司 Manganese high phosphorus hot metal proposes the preparation method that carbon protects manganese in a kind of converter smelting
CN109666775A (en) * 2018-11-16 2019-04-23 九江萍钢钢铁有限公司 A kind of blast furnace labour quick smelting process of converter
CN109385503A (en) * 2018-12-06 2019-02-26 云南玉溪仙福钢铁(集团)有限公司 It protects carbon and protects manganese converter steelmaking process
CN109385503B (en) * 2018-12-06 2021-01-05 云南玉溪仙福钢铁(集团)有限公司 Carbon-preserving manganese-preserving converter steelmaking process
CN110616290A (en) * 2019-09-30 2019-12-27 山东钢铁股份有限公司 Converter single slag remaining smelting method capable of reducing final slag height
CN110616290B (en) * 2019-09-30 2021-06-18 山东钢铁股份有限公司 Converter single slag remaining smelting method capable of reducing final slag height
CN110527785A (en) * 2019-10-10 2019-12-03 攀钢集团攀枝花钢铁研究院有限公司 Half steel less-slag melting converter manganese ore direct alloying technique technique
CN110527785B (en) * 2019-10-10 2021-05-28 攀钢集团攀枝花钢铁研究院有限公司 Direct alloying process of manganese ore in semi-steel low-slag smelting converter
CN111534660A (en) * 2020-05-22 2020-08-14 山东钢铁股份有限公司 Method for improving manganese element in molten steel at converter end point
CN111534660B (en) * 2020-05-22 2022-04-29 山东钢铁股份有限公司 Method for improving manganese element in molten steel at converter end point
CN112853026A (en) * 2021-01-06 2021-05-28 鞍钢股份有限公司 Manganese alloying method for smelting high manganese steel by converter

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