CN105219918A - Reduce the arc furnace steelmaking process of phosphorus element content in molten steel - Google Patents
Reduce the arc furnace steelmaking process of phosphorus element content in molten steel Download PDFInfo
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- CN105219918A CN105219918A CN201510630652.8A CN201510630652A CN105219918A CN 105219918 A CN105219918 A CN 105219918A CN 201510630652 A CN201510630652 A CN 201510630652A CN 105219918 A CN105219918 A CN 105219918A
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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
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Abstract
A kind of arc furnace steelmaking process reducing phosphorus element content in molten steel, comprise the steps: to be equipped with add predetermined amount in the electric arc furnace of furnace charge and lime oxidation sludge and fluorite after, electric arc furnace is started working, wherein, oxidation sludge is utilized to increase the oxidisability of the slag in electric arc furnace, to strengthen the dephosphorizing capacity of slag, utilize fluorite to promote CaO-SiO
2the rapid melting of mixture, to improve the CaO content of slag, increases slag dephosphorizing capacity; In the melting period of furnace charge, in electric arc furnace, blow oxygen; In the oxygen blast later stage, the body of heater of inclination electric arc furnace, flows out to make slag.
Description
Technical field
The present invention relates to smelting molten steel technical field, particularly a kind of arc furnace steelmaking process reducing phosphorus element content in molten steel.
Background technology
Solid materials melts by the steps such as electric-arc furnace steelmaking mainly melts, be oxidized, reduction, and removes the harmful element in molten steel.Phosphoric, as harmful element, can increase the cold shortness of foundry goods, and welding property is deteriorated, and reduces the plasticity of foundry goods, so dephosphorization is one of main task of electric-arc furnace steelmaking.Along with the development of modern science and technology, the performance requriements of association area to foundry goods improves constantly, and how to produce the matter of utmost importance that Low-phosphorus Steel has become the research of many steel-making producers.
In conventional arc stove method for making steel, be that lime is added furnace bottom, react by the CaO in lime and the phosphoric in molten steel the object reaching dephosphorization, and carry out stream slag early stage in oxygen blast, oxygen blast terminates rear sampling and analyzes, if phosphoric reaches code requirement, can reduce tapping.But there is following problem in above-mentioned conventional arc stove method for making steel: the SiO of the CaO in lime easily and in molten steel
2in conjunction with generation CaO-SiO
2mixture, this mixture is extremely infusibilized, can hinder dephosphorisation reaction, causes and is difficult to the phosphorus content in molten steel to take off in extremely low scope.
Summary of the invention
In view of this, be necessary to provide a kind of arc furnace steelmaking process reducing phosphorus element content in molten steel.
Reduce an arc furnace steelmaking process for phosphorus element content in molten steel, comprise the steps:
To be equipped with add predetermined amount in the electric arc furnace of furnace charge and lime oxidation sludge and fluorite after, electric arc furnace is started working, wherein, utilizes oxidation sludge to increase the oxidisability of the slag in electric arc furnace, to strengthen the dephosphorizing capacity of slag, utilize fluorite to promote CaO-SiO
2the rapid melting of mixture, to improve the CaO content of slag, increases slag dephosphorizing capacity;
In the melting period of furnace charge, in electric arc furnace, blow oxygen;
In the oxygen blast later stage, the body of heater of inclination electric arc furnace, flows out to make slag.
Preferably, the add-on of oxidation sludge is 1 ~ 2t, and oxidation sludge must be added to the mid-way of furnace charge, prevents electrode from contacting with oxidation sludge and non-conductive, and causing cannot power transmission.
Preferably, the add-on of fluorite is 0.3% ~ 0.5% of furnace charge gross weight.
Preferably, the add-on of fluorite is 0.4% of furnace charge gross weight.
Preferably, the step of " in the melting period of furnace charge, blowing oxygen in electric arc furnace " is specially: in electric arc furnace after load melting half, just to oxygen decarburization in molten steel, and oxygen blast pressure is 1.2 ~ 1.6Mpa, and oxygen blast flow is 2500 ~ 3000m
3/ h.
Preferably, oxygen blast pressure is 1.4Mpa, and oxygen blast flow is 2750m
3/ h.
In above-mentioned reduction molten steel phosphorus element content arc furnace steelmaking process in, oxidation sludge and the fluorite of predetermined amount is added in the electric arc furnace that furnace charge and lime be housed, utilize oxidation sludge to increase the oxidisability of the slag in electric arc furnace, to strengthen the dephosphorizing capacity of slag, utilize fluorite to promote CaO-SiO
2the rapid melting of mixture, to improve the CaO content of slag, increase slag dephosphorizing capacity, in the melting period of furnace charge, oxygen is blowed in the oxygen blast later stage in electric arc furnace, the body of heater of inclination electric arc furnace, to make slag flow out, so can be removed to less than 0.002% by minimum for the phosphorus in molten steel in electric arc furnace, in stove, blow oxygen in melting period simultaneously, be conducive to the fusing promoting furnace charge, improve the efficiency of electric arc furnace, saved production cost.In addition, use oxidation sludge to replace iron ore not only can quick dephosphorization, and a part of cost can be saved.
Embodiment
The invention provides a kind of arc furnace steelmaking process reducing phosphorus element content in molten steel, by adding oxidation sludge, fluorite in furnace charge, and in electric arc furnace, blow the modes such as oxygen in melting period the phosphorus content in molten steel is taken off lowest range.In this reduction molten steel, the arc furnace steelmaking process of phosphorus element content, comprises the steps:
Step S300, to be equipped with add predetermined amount in the electric arc furnace of furnace charge and lime oxidation sludge and fluorite after, electric arc furnace is started working, wherein, utilize oxidation sludge to increase the oxidisability of the slag in electric arc furnace, to strengthen the dephosphorizing capacity of slag, utilize fluorite to promote CaO-SiO
2the rapid melting of mixture, to improve the CaO content of slag, increases slag dephosphorizing capacity.Wherein, the add-on of oxidation sludge is 1 ~ 2t, and oxidation sludge must be added to the mid-way of furnace charge, prevents electrode from contacting with oxidation sludge and non-conductive, and causing cannot power transmission; The add-on of fluorite is 0.3% ~ 0.5% of furnace charge gross weight, and such as, the add-on of fluorite is 0.4% of furnace charge gross weight.In this step, adopt oxidation sludge to replace iron ore, have the following advantages: oxidation sludge is as the waste of foundry, price is very cheap, adds in electric arc furnace and turns waste into wealth, not only can produce a part of molten steel, and the oxidisability of slag can be increased, strengthen its dephosphorizing capacity.
Step S301, in the melting period of furnace charge, blows oxygen in electric arc furnace.The step " in the melting period of furnace charge, blowing oxygen in electric arc furnace " is specially: in electric arc furnace after load melting half, just to oxygen decarburization in molten steel, and oxygen blast pressure is 1.2 ~ 1.6Mpa, and oxygen blast flow is 2500 ~ 3000m
3/ h, such as, oxygen blast pressure is 1.4Mpa, and oxygen blast flow is 2750m
3/ h.In the melting period of furnace charge, because furnace charge does not melt completely, molten steel temperature is very low, add oxygen blast and stir molten steel, slag fully contacts with molten steel, the carrying out of the dephosphorisation reaction that is highly advantageous to, so not only can improve electric arc furnace smelting efficiency, and the effect of quick dephosphorization can be played.
Step S302, in the oxygen blast later stage, the body of heater of inclination electric arc furnace, flows out to make slag.Tradition steel-making mode, owing to worrying that the phosphoric in slag comes back in molten steel, so take oxygen blast while the mode of the slag that outflows toward stove early stage in oxygen blast, arriving like this in oxygen blast later stage electric arc furnace and not having bits, continuing dephosphorization again by being difficult to.Bits in stove, in the electric arc furnace oxygen blast later stage, drain off only by the present invention, can effectively utilize slag to be removed by the phosphorus in molten steel.
In above-mentioned reduction molten steel phosphorus element content arc furnace steelmaking process in, oxidation sludge and the fluorite of predetermined amount is added in the electric arc furnace that furnace charge and lime be housed, utilize oxidation sludge to increase the oxidisability of the slag in electric arc furnace, to strengthen the dephosphorizing capacity of slag, utilize fluorite to promote CaO-SiO
2the rapid melting of mixture, to improve the CaO content of slag, increase slag dephosphorizing capacity, in the melting period of furnace charge, oxygen is blowed in the oxygen blast later stage in electric arc furnace, the body of heater of inclination electric arc furnace, to make slag flow out, so can be removed to less than 0.002% by minimum for the phosphorus in molten steel in electric arc furnace, in stove, blow oxygen in melting period simultaneously, be conducive to the fusing promoting furnace charge, improve the efficiency of electric arc furnace, saved production cost.In addition, use oxidation sludge to replace iron ore not only can quick dephosphorization, and a part of cost can be saved.
Claims (6)
1. reduce an arc furnace steelmaking process for phosphorus element content in molten steel, comprise the steps:
To be equipped with add predetermined amount in the electric arc furnace of furnace charge and lime oxidation sludge and fluorite after, electric arc furnace is started working, wherein, utilizes oxidation sludge to increase the oxidisability of the slag in electric arc furnace, to strengthen the dephosphorizing capacity of slag, utilize fluorite to promote CaO-SiO
2the rapid melting of mixture, to improve the CaO content of slag, increases slag dephosphorizing capacity;
In the melting period of furnace charge, in electric arc furnace, blow oxygen;
In the oxygen blast later stage, the body of heater of inclination electric arc furnace, flows out to make slag.
2. the arc furnace steelmaking process of phosphorus element content in reduction molten steel according to claim 1, it is characterized in that: the add-on of oxidation sludge is 1 ~ 2t, oxidation sludge must be added to the mid-way of furnace charge, prevents electrode from contacting with oxidation sludge and non-conductive, and causing cannot power transmission.
3. the arc furnace steelmaking process of phosphorus element content in reduction molten steel according to claim 1, is characterized in that: the add-on of fluorite is 0.3% ~ 0.5% of furnace charge gross weight.
4. the arc furnace steelmaking process of phosphorus element content in reduction molten steel according to claim 3, is characterized in that: the add-on of fluorite is 0.4% of furnace charge gross weight.
5. the arc furnace steelmaking process of phosphorus element content in reduction molten steel according to claim 1, it is characterized in that: the step of " in the melting period of furnace charge; blow oxygen in electric arc furnace " is specially: in electric arc furnace after load melting half, just to oxygen decarburization in molten steel, oxygen blast pressure is 1.2 ~ 1.6Mpa, and oxygen blast flow is 2500 ~ 3000m
3/ h.
6. the arc furnace steelmaking process of phosphorus element content in reduction molten steel according to claim 5, it is characterized in that: oxygen blast pressure is 1.4Mpa, oxygen blast flow is 2750m
3/ h.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20180363077A1 (en) * | 2017-06-16 | 2018-12-20 | University Of Science And Technology Beijing | Production method for smelting clean steel from full-scrap steel using duplex electric arc furnaces |
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| CN101892352A (en) * | 2010-07-27 | 2010-11-24 | 辽宁天和矿产有限公司 | Arc furnace deep dephosphorization technology and deep dephosphorization agent thereof |
| CN102634634A (en) * | 2012-04-24 | 2012-08-15 | 攀钢集团成都钢钒有限公司 | Method for producing high-alloy low-phosphorous steel used for boiler tube by adopting electric-arc furnace |
| CN102965467A (en) * | 2012-10-31 | 2013-03-13 | 德龙钢铁有限公司 | Low-cost efficient dephosphorization smelting process for electric arc furnace |
| CN104313487A (en) * | 2014-10-27 | 2015-01-28 | 黑龙江省冶金研究所 | Steel having no surface hardening and used for ultrahigh strength sucker rod and preparation method of steel |
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2015
- 2015-09-29 CN CN201510630652.8A patent/CN105219918A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101892352A (en) * | 2010-07-27 | 2010-11-24 | 辽宁天和矿产有限公司 | Arc furnace deep dephosphorization technology and deep dephosphorization agent thereof |
| CN102634634A (en) * | 2012-04-24 | 2012-08-15 | 攀钢集团成都钢钒有限公司 | Method for producing high-alloy low-phosphorous steel used for boiler tube by adopting electric-arc furnace |
| CN102965467A (en) * | 2012-10-31 | 2013-03-13 | 德龙钢铁有限公司 | Low-cost efficient dephosphorization smelting process for electric arc furnace |
| CN104313487A (en) * | 2014-10-27 | 2015-01-28 | 黑龙江省冶金研究所 | Steel having no surface hardening and used for ultrahigh strength sucker rod and preparation method of steel |
Non-Patent Citations (1)
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| 沈才芳 等: "《电弧炉炼钢工艺与设备》", 31 January 2001, 冶金工业出版社 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20180363077A1 (en) * | 2017-06-16 | 2018-12-20 | University Of Science And Technology Beijing | Production method for smelting clean steel from full-scrap steel using duplex electric arc furnaces |
| US10767239B2 (en) * | 2017-06-16 | 2020-09-08 | University Of Science And Technology Beijing | Production method for smelting clean steel from full-scrap steel using duplex electric arc furnaces |
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Application publication date: 20160106 |