CN103114170A - Smelting process for increasing yield of electric-arc furnace - Google Patents
Smelting process for increasing yield of electric-arc furnace Download PDFInfo
- Publication number
- CN103114170A CN103114170A CN2012105187458A CN201210518745A CN103114170A CN 103114170 A CN103114170 A CN 103114170A CN 2012105187458 A CN2012105187458 A CN 2012105187458A CN 201210518745 A CN201210518745 A CN 201210518745A CN 103114170 A CN103114170 A CN 103114170A
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- CN
- China
- Prior art keywords
- cinder notch
- carbon
- cinder
- smelting
- steel
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- Granted
Links
- 238000003723 Smelting Methods 0.000 title claims abstract description 21
- 238000010891 electric arc Methods 0.000 title claims abstract description 8
- 238000000034 method Methods 0.000 title abstract description 9
- 239000003818 cinder Substances 0.000 claims abstract description 57
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 42
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 42
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 29
- 239000010959 steel Substances 0.000 claims abstract description 29
- 239000002893 slag Substances 0.000 claims abstract description 19
- 238000010079 rubber tapping Methods 0.000 claims abstract description 14
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 8
- 239000001301 oxygen Substances 0.000 claims abstract description 8
- 229910000805 Pig iron Inorganic materials 0.000 claims abstract description 5
- 238000007664 blowing Methods 0.000 claims abstract description 4
- 238000005245 sintering Methods 0.000 claims abstract description 4
- 239000007921 spray Substances 0.000 claims description 13
- 238000005516 engineering process Methods 0.000 claims description 10
- 238000011084 recovery Methods 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 4
- 230000002950 deficient Effects 0.000 claims description 3
- 230000003647 oxidation Effects 0.000 claims description 3
- 238000007254 oxidation reaction Methods 0.000 claims description 3
- 238000005502 peroxidation Methods 0.000 claims description 3
- 210000003625 skull Anatomy 0.000 claims description 3
- 239000004449 solid propellant Substances 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract 4
- 238000005507 spraying Methods 0.000 abstract 4
- 102100034176 Glutathione-specific gamma-glutamylcyclotransferase 1 Human genes 0.000 abstract 2
- 101710175495 Glutathione-specific gamma-glutamylcyclotransferase 1 Proteins 0.000 abstract 2
- 229910052742 iron Inorganic materials 0.000 abstract 2
- 238000002844 melting Methods 0.000 abstract 2
- 230000008018 melting Effects 0.000 abstract 2
- 238000002485 combustion reaction Methods 0.000 abstract 1
- 239000000843 powder Substances 0.000 abstract 1
- 239000002699 waste material Substances 0.000 abstract 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 3
- 239000006260 foam Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000011017 operating method Methods 0.000 description 1
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
Abstract
The invention discloses a smelting process for increasing yield of an electric-arc furnace, and belongs to the technical field of smelting. According to the smelting process, procedures such as plugging the cinder notch, opening the cinder notch and spraying carbon in time are added. The smelting process comprises the following specific steps of: A. plugging the cinder notch, namely, adding pig iron in different batches, wherein the total carbon content is 2-10%, and when motel iron in a melting pool overflows from the cinder notch, the cinder notch is plugged by using a powder waste material so as to form a slag crust to plug the cinder notch under the function of high-temperature sintering; B. completely plugging the cinder botch, namely, after the pig iron is added for the third time, as the melting pool is limited in size, more generally a large quantity of molten ion overflows from the cinder notch, then increasing the height of the cinder notch till the cinder botch is completely plugged; C. opening the cinder notch, namely, at the later period of smelting and when the carbon element is completely reacted, opening the cinder notch by using a self-consumed oxygen gun in a combustion mode, blowing the cinder notch and shaking the furnace so as to prevent the slag steel from overflowing; D. spraying carbon, namely, after the cinder notch is combusted, inserting the carbon gun into the furnace port in time to start the carbon spraying operation so as to achieve an appropriate steel tapping carbon content, wherein the carbon spraying quantity is determined according to the residual carbon content of the motel iron; and E. tapping steel, namely, raising the temperature in large current till the steel is smelted.
Description
Technical field
The invention belongs to technical field of smelting.
Background technology
The characteristics of electric arc furnace smelting be in theory can be endless the cold burdens such as use steel scrap, there is no to use full scrap smelting under the condition of hot metal charge, in the situation that appointed condition allows to use the scrap steel preheating technology.The electric arc furnace of some little section steel works uses full scrap smelting under the condition that there is no the scrap steel preheating technology at present, the most foamy slags that use of the method for electric arc furnace smelting are smelted method, but in the situation that not stifled cinder notch, the foam slag blanket is thin, slag steel milkiness degree is little than this method, and under the identical device ability condition, speed of response is slow, the problem such as in smelting process carbon content is low, the steel scrap recovery rate is not high, and does not farthest excavate and produce potential.
Summary of the invention
The purpose of this invention is to provide a kind of smelting technology that improves the electric arc furnace recovery rate, thinner to solve the prior art foamy slag, the problem such as the steel scrap recovery rate is low.
The technical solution adopted for the present invention to solve the technical problems is to increase gradation to block up cinder notch, open cinder notch and spray carbon operation, and its concrete technology step is as follows:
A, stifled cinder notch: pig iron amount is added in batches, total mixed carbon comtent is at 2%-10%, after the second defective material adds, when the molten steel in the molten bath is arranged overflows sign from cinder notch, begin with the stifled cinder notch of powdered solid fuel, form skull and block cinder notch under the high temperature sintering effect, this stage need not to block fully, guarantees that water cooled oxygen lance still can be as the criterion in the fire door operation.
B, stifled cinder notch entirely: because the molten bath is limited, the more meeting of molten steel drops down from cinder notch in a large number after material adds for the third time, should raise the height of stifled cinder notch this moment until block fully.
C, open cinder notch: smelting the later stage, will react completely at carbon, foamy slag begins to weaken, furnace charge all molten clear and temperature also near tapping temperature, when temperature is elevated to 1550-1600 ℃, with the boiled cinder notch of Self comsuming oxygen rifle, when blowing cinder notch open, the while grate, overflow with the anti-slag steel.
D, spray carbon: after boiled cinder notch, in time the carbon rifle is inserted fire door and begin to spray the carbon operation, be used for the FeO of reducing slag, also join carbon and outwell the partial oxidation slag in molten steel simultaneously, prevent the peroxidation of molten steel, reach suitable tapping carbon content, spray carbon amount is decided according to the residual carbon content of molten steel.
E, tapping: large electric current temperature raising is until tapping.Wherein electric current is 30KA-35KA, temperature 〉=1650 ℃.
Adopting positively effect of the present invention is stifled cinder notch operating procedure, can be in the situation that full scrap smelting, with recovery rate bring up to average every stove 92.5% and more than.Blow cinder notch in the smelting later stage open with Self comsuming oxygen rifle and carry out slagging, spray carbon with the carbon rifle to cinder notch in the time of slagging, in reducing slag, ferric oxide improves recovery rate.
Embodiment
The present invention increases the stifled cinder notch of gradation, opens cinder notch and in time spray the carbon operation, and its concrete technology step is as follows:
A, stifled cinder notch: pig iron amount is added in batches, mixed carbon comtent 5%, after the second defective material adds, when the molten steel in the molten bath is arranged overflows sign from cinder notch, begin with the stifled cinder notch of powdered solid fuel, form skull and block cinder notch under the high temperature sintering effect, this stage need not to block fully, guarantees that water cooled oxygen lance still can be as the criterion in the fire door operation.
B, stifled cinder notch entirely: because the molten bath is limited, the more meeting of molten steel drops down from cinder notch in a large number after material adds for the third time, and should raise the height of stifled cinder notch this moment, until block fully.
C, open cinder notch: smelting the later stage, will react completely at carbon, foamy slag begins to weaken, furnace charge all molten clear and temperature also near tapping temperature, when temperature is elevated to approximately more than 1550 ℃, with the boiled cinder notch of Self comsuming oxygen rifle, when blowing cinder notch open, the while grate, overflow with the anti-slag steel.
D, spray carbon: after boiled cinder notch, in time the carbon rifle is inserted fire door and begin to spray the carbon operation, be used for the FeO of reducing slag, join carbon and outwell the partial oxidation slag in molten steel simultaneously, prevent the peroxidation of molten steel, reach suitable tapping carbon content, spray carbon amount is decided according to the residual carbon content of molten steel.
E, tapping: large electric current temperature raising is until tapping.Wherein electric current is 30KA, and temperature is 〉=1650 ℃.
Claims (1)
1. smelting technology that improves the electric arc furnace recovery rate, this smelting technology increase the stifled cinder notch of gradation, open cinder notch and spray carbon operation, and its concrete technology step is as follows:
A, stifled cinder notch: pig iron amount is added in batches, total mixed carbon comtent is at 2%-10%, after the second defective material adds, when the molten steel in the molten bath is arranged overflows sign from cinder notch, begin with the stifled cinder notch of powdered solid fuel, form skull and block cinder notch under the high temperature sintering effect, this stage need not to block fully, guarantees that water cooled oxygen lance still can be as the criterion in the fire door operation;
B, stifled cinder notch entirely: because the molten bath is limited, the more meeting of molten steel drops down from cinder notch in a large number after material adds for the third time, should raise the height of stifled cinder notch this moment until block fully;
C, open cinder notch: smelting the later stage, will react completely at carbon, foamy slag begins to weaken, furnace charge all molten clear and temperature also near tapping temperature, when temperature is elevated to 1550-1600 ℃, with the boiled cinder notch of Self comsuming oxygen rifle, when blowing cinder notch open, the while grate, overflow with the anti-slag steel;
D, spray carbon: after boiled cinder notch, in time the carbon rifle is inserted fire door and begin to spray the carbon operation, be used for the FeO of reducing slag, also join carbon and outwell the partial oxidation slag in molten steel simultaneously, prevent the peroxidation of molten steel, reach suitable tapping carbon content, spray carbon amount is decided according to the residual carbon content of molten steel;
E, tapping: large electric current temperature raising is until tapping, and wherein electric current is 30KA-35KA, temperature 〉=1650 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210518745.8A CN103114170B (en) | 2012-12-06 | 2012-12-06 | Smelting process for increasing yield of electric-arc furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210518745.8A CN103114170B (en) | 2012-12-06 | 2012-12-06 | Smelting process for increasing yield of electric-arc furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103114170A true CN103114170A (en) | 2013-05-22 |
| CN103114170B CN103114170B (en) | 2014-09-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210518745.8A Active CN103114170B (en) | 2012-12-06 | 2012-12-06 | Smelting process for increasing yield of electric-arc furnace |
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| Country | Link |
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| CN (1) | CN103114170B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109609725A (en) * | 2019-01-28 | 2019-04-12 | 中南大学 | A method of improving electric-arc furnace steelmaking fire door stream slag magnetic separation iron yield |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2797152B2 (en) * | 1991-03-07 | 1998-09-17 | トーア・スチール株式会社 | DC electric furnace for metal refining |
| CN1199853A (en) * | 1997-04-14 | 1998-11-25 | 奥托库姆普联合股份公司 | Method for cleaning slag in electric furnace |
| KR20010009762A (en) * | 1999-07-13 | 2001-02-05 | 이구택 | Operation method of twin shell electrode arc furnace |
| KR20110130719A (en) * | 2010-05-28 | 2011-12-06 | 현대제철 주식회사 | Lance apparatus of electric furnace |
-
2012
- 2012-12-06 CN CN201210518745.8A patent/CN103114170B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2797152B2 (en) * | 1991-03-07 | 1998-09-17 | トーア・スチール株式会社 | DC electric furnace for metal refining |
| CN1199853A (en) * | 1997-04-14 | 1998-11-25 | 奥托库姆普联合股份公司 | Method for cleaning slag in electric furnace |
| KR20010009762A (en) * | 1999-07-13 | 2001-02-05 | 이구택 | Operation method of twin shell electrode arc furnace |
| KR20110130719A (en) * | 2010-05-28 | 2011-12-06 | 현대제철 주식회사 | Lance apparatus of electric furnace |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109609725A (en) * | 2019-01-28 | 2019-04-12 | 中南大学 | A method of improving electric-arc furnace steelmaking fire door stream slag magnetic separation iron yield |
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| Publication number | Publication date |
|---|---|
| CN103114170B (en) | 2014-09-10 |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of invention: Smelting process for increasing yield of electric-arc furnace Effective date of registration: 20190227 Granted publication date: 20140910 Pledgee: Yucheng Branch of Agricultural Bank of China Ltd. Pledgor: TONGYU HEAVY INDUSTRY Co.,Ltd. Registration number: 2019990000162 |
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Date of cancellation: 20210304 Granted publication date: 20140910 Pledgee: Yucheng Branch of Agricultural Bank of China Ltd. Pledgor: TONGYU HEAVY INDUSTRY Co.,Ltd. Registration number: 2019990000162 |
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Denomination of invention: Smelting process to improve the yield of EAF Effective date of registration: 20210304 Granted publication date: 20140910 Pledgee: Yucheng Branch of Agricultural Bank of China Ltd. Pledgor: TONGYU HEAVY INDUSTRY Co.,Ltd. Registration number: Y2021990000216 |
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Date of cancellation: 20230320 Granted publication date: 20140910 Pledgee: Yucheng Branch of Agricultural Bank of China Ltd. Pledgor: TONGYU HEAVY INDUSTRY Co.,Ltd. Registration number: Y2021990000216 |
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Denomination of invention: Smelting process for improving the yield of electric arc furnace Effective date of registration: 20230323 Granted publication date: 20140910 Pledgee: Yucheng Branch of Agricultural Bank of China Ltd. Pledgor: TONGYU HEAVY INDUSTRY Co.,Ltd. Registration number: Y2023980035948 |
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