CN105986054A - Method for modifying and reducing converter final slag - Google Patents
Method for modifying and reducing converter final slag Download PDFInfo
- Publication number
- CN105986054A CN105986054A CN201510081021.5A CN201510081021A CN105986054A CN 105986054 A CN105986054 A CN 105986054A CN 201510081021 A CN201510081021 A CN 201510081021A CN 105986054 A CN105986054 A CN 105986054A
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- Prior art keywords
- slag
- converter
- carburant
- ferrosilicon
- molten steel
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- 239000002893 slag Substances 0.000 title claims abstract description 92
- 238000000034 method Methods 0.000 title claims abstract description 28
- 230000001603 reducing effect Effects 0.000 title abstract description 6
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 62
- 239000010959 steel Substances 0.000 claims abstract description 62
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims abstract description 28
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 18
- 229910052742 iron Inorganic materials 0.000 claims abstract description 17
- 238000010079 rubber tapping Methods 0.000 claims abstract description 17
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 23
- 238000003723 Smelting Methods 0.000 claims description 11
- 239000002994 raw material Substances 0.000 claims description 11
- 229910045601 alloy Inorganic materials 0.000 claims description 7
- 239000000956 alloy Substances 0.000 claims description 7
- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical compound [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 claims description 7
- 239000004568 cement Substances 0.000 claims description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 5
- 238000005272 metallurgy Methods 0.000 claims description 5
- 229910052710 silicon Inorganic materials 0.000 claims description 5
- 239000010703 silicon Substances 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 4
- 238000007667 floating Methods 0.000 claims description 4
- 238000005507 spraying Methods 0.000 claims description 4
- 239000004567 concrete Substances 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims 1
- 238000004064 recycling Methods 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000003912 environmental pollution Methods 0.000 abstract 1
- 239000011572 manganese Substances 0.000 description 13
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 11
- 239000000292 calcium oxide Substances 0.000 description 9
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 9
- 229910052681 coesite Inorganic materials 0.000 description 6
- 229910052906 cristobalite Inorganic materials 0.000 description 6
- 239000000377 silicon dioxide Substances 0.000 description 6
- 229910052682 stishovite Inorganic materials 0.000 description 6
- 229910052905 tridymite Inorganic materials 0.000 description 6
- 239000000203 mixture Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- 235000012239 silicon dioxide Nutrition 0.000 description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 2
- 239000003818 cinder Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 229910052593 corundum Inorganic materials 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 229910001845 yogo sapphire Inorganic materials 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 239000013070 direct material Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000006253 efflorescence Methods 0.000 description 1
- 238000001879 gelation Methods 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000007885 magnetic separation Methods 0.000 description 1
- 150000002696 manganese Chemical class 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 206010037844 rash Diseases 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention provides a method for modifying and reducing converter final slag, which is characterized in that after converter tapping, a carburant and ferrosilicon are added into the slag, Fe, Mn and P elements in the slag are reduced into molten steel, and the molten steel containing the Fe, Mn and P elements and the dephosphorized and modified slag are separated and reused respectively. Compared with the prior art, the invention has the beneficial effects that: a method for modifying and reducing converter final slag can effectively recycle and utilize the converter final slag, finally realize the complete recycling of the converter final slag, and solve the problems of difficult treatment of converter tail slag and environmental pollution.
Description
Technical field
The present invention relates to the energy-conserving and emission-cutting technology field in metallurgy industry, particularly to a kind of modified to converter finishing slag and reduce
Method.
Background technology
Slag is the waste residue of steel industry, and its discharge capacity is about the 12%～about 15% of output of steel, in recent years, along with China's steel
Developing rapidly of ferrum industry, slag amount the most constantly increases, and the only output of China's slag in 2013 is just more than 2.5 hundred million tons.By
Not obtaining extensively effectively utilizing in slag for a long time, big steel slag throws aside slag field, both land occupation resource, pollutes again
Environment.
Slag contains the gelling mineral such as a number of C2S, C3S, is that one has a potential gelation activity material, but by
Containing unease materials such as certain free calcium oxide f-CaO in vessel slag, during its hydrolysis, volume is by increase about 1 times, and
The efflorescence causing vessel slag expands, its as the application in building material industry such as aggregate, admixture by bigger restriction.
Though the stability of slag is had necessarily by the methods such as traditional process for treating steel slag such as hot application method, heat stewing method, drum process, wind quenching method
Improve, but be all difficult to thoroughly solve the unease problem of f-CaO etc..
In general, the available resource of slag includes melt cinder sensible heat, fe and tailings mineral.Existing liquid slag processes
In technique, slag cooling procedure is mainly based on water-cooled, and the quantity of steam of generation is big, pressure is low, quality is low, it is difficult to by produce
Steam is used, and the most existing various Technology of Steel Slag Processings fail to realize melt cinder and show pick up the heat, mainly examine
Consider fe and the comprehensive utilization of tailings mineral.
Major part iron and steel enterprise is all that hot steel slag carries out carrying out after various different cooling processes a broken screening one both at home and abroad
Magnetic separation is processed, and is used after extracting metal therein again.
At the initial stage in last century, the value of the slag that abroad begins one's study, some main iron and steel manufacturing country metallurgical slags are substantially so far
Have been realized in all of, as U.S.'s metallurgical slag utilization rate has been over 98%, Germany and Japan more than 95%, and I
State, compared with foreign iron and steel industrially developed country, there is also bigger gap in terms of slag comprehensive utilization.According to data of literatures
Report, current China steel slag utilization rate only 36%, along with increasing considerably of recent year iron and steel output, slag comprehensive utilization
It is relative drop trend by rate.
Summary of the invention
It is an object of the invention to provide method that is a kind of modified to converter finishing slag and that reduce, can effectively reclaim and utilize converter
Finishing slag, finally realizes whole recyclings of converter finishing slag, solves converter tailings and processes problem difficult, that pollute environment.
For achieving the above object, the present invention realizes by the following technical solutions:
Method that is a kind of modified to converter finishing slag and that reduce, after converter tapping, by adding carburant, ferrosilicon in slag,
Fe in slag, Mn, P element are reverted in molten steel, and by containing Fe, Mn, P element molten steel modified with dephosphorization
Slag separate, each re-use；Concrete method step is as follows:
1) converter is normally tapped, and after arriving zero-bit, adds carburant at once in slag；
2) addition carburant is after 1 minute, then adds ferrosilicon in slag；
3) addition ferrosilicon is after 3-5 minute, and grate is tapped, and tapping hole is blocked up tight by front floating plug of tapping, and during tapping, converter is straight
Connecing and shake 95 ° with prestissimo, steel stream is near the outer edge of ladle, by containing Fe, Mn, the molten steel overturning of P element
Enter in the mold of furnace rear；
4) having gone out steel and carried out deslagging, and slag is carried out water-spraying control, the slag after modified with reduction is used as cement raw material and uses,
Or it is reused for smelting molten steel as converter molten steel raw materials for metallurgy to use；
5) it is little steel ingot by pouring in furnace rear mold containing Fe, Mn, the molten steel cooled and solidified of P element, uses with alloy form
In the smelting of phosphorous steel grade.
Described carburant be carbon containing be the carburant of 90%, the addition of carburant be slag per ton add 5-10Kg carburant.
Described ferrosilicon be silicon content be the ferrosilicon of 75%, the addition of ferrosilicon be slag per ton add 80-90Kg ferrosilicon.
Compared with prior art, the invention has the beneficial effects as follows:
Method that is a kind of modified to converter finishing slag and that reduce, utilizes the alloy ferrosilicon of strong reducing property, slag is carried out modified with reduction
Processing, the molten steel after reduction can use as the alloy smelting phosphorous steel grade after taking off slag, and be modified and depart from from molten steel
Slag out can use as the direct material producing cement, or is reused for smelting molten steel as converter smelting raw material.
Finally realize whole recyclings of slag, solve converter tailings and process problem difficult, that pollute environment.The present invention is simple,
Practical, use carburant that slag is tentatively reduced in advance, cost can be reduced.
Detailed description of the invention
Below in conjunction with Figure of description, the present invention is described in detail, it should be noted that the enforcement of the present invention be not limited to
Under embodiment.
Method that is a kind of modified to converter finishing slag and that reduce, after converter tapping, by adding carburant, ferrosilicon in slag,
Fe in slag, Mn, P element are reverted in molten steel, and by containing Fe, Mn, P element molten steel modified with dephosphorization
Slag separate, each re-use；Concrete method step is as follows:
1) converter is normally tapped, and after arriving zero-bit, adds carburant at once in slag；
2) addition carburant is after 1 minute, then adds ferrosilicon in slag；
3) addition ferrosilicon is after 3-5 minute, and grate is tapped, and tapping hole is blocked up tight by front floating plug of tapping, and during tapping, converter is straight
Connect and shake 95 ° with prestissimo, steel stream near the outer edge of ladle, by containing Fe, Mn, P element molten steel rapid
Overturning enters in the mold of furnace rear；
4) having gone out steel and carried out deslagging, and slag is carried out water-spraying control, the slag after modified with reduction is used as cement raw material and uses,
Or it is reused for smelting molten steel as converter molten steel raw materials for metallurgy to use；
5) it is little steel ingot by pouring in furnace rear mold containing Fe, Mn, the molten steel cooled and solidified of P element, uses with alloy form
In the smelting of phosphorous steel grade.
Carburant be carbon containing be the carburant of 90%, the addition of carburant be slag per ton add 5-10Kg carburant.
Ferrosilicon be silicon content be the ferrosilicon of 75%, the addition of ferrosilicon be slag per ton add 80-90Kg ferrosilicon.
Embodiment 1: produce Q235B steel grade, as a example by the converter finishing slag of generation, converter finishing slag with 260 tons of item bottom blown converters
Amount is 25 tons.The composition of converter finishing slag and content is as listed in table 1:
Table 1:
| Composition | SiO2 | Al2O3 | CaO | MgO | TFe | MnO | f-CaO | P2O5 |
| Content (%) | 12.99 | 1.4 | 39.31 | 9.26 | 18.44 | 2.78 | 7.35 | 2.71 |
And the method reduced modified to converter finishing slag and specifically comprising the following steps that
1) after converter tapping, when arriving zero-bit, adding 200Kg carburant, used in the present embodiment, carburant is middle coal
The carburant 90 that Ningxia carburant factory produces.
2) addition carburant is after 1 minute, adds 2 tons of ferrosilicon, and the ferrosilicon used in the present embodiment is the western gold mine in Erdos
The FeSi75-B ferrosilicon that smelting Co., Ltd produces.
3) addition ferrosilicon is after 3-5 minute, and grate is tapped, and tapping hole is blocked up tight by front floating plug of tapping, during tapping, and converter
Directly shake 95 ° with prestissimo, steel stream near ladle outer edge, by containing Fe, Mn, P element molten steel rapid
Overturning enters in the mold of furnace rear, sees that slag lifts stove.
4) having gone out steel and carried out deslagging, and slag is carried out water-spraying control, the slag after modified with reduction can serve as cement raw material
Use, it is also possible to be reused for smelting molten steel as converter molten steel raw materials for metallurgy and use.
5) it is little steel ingot by pouring in furnace rear mold containing Fe, Mn, the molten steel cooled and solidified of P element, uses with alloy form
In the smelting of phosphorous steel grade.
In order to cost-effective, in converter finishing slag, add carburant in advance, the unnecessary oxygen in slag is reduced, then
Add ferrosilicon, utilize the silicon in ferrosilicon further the Fe in slag, Mn, P element to be separated in molten steel.Reducing
The chemical reaction occurred in journey is:
2 (MnO)+Si=(SiO2)+2 [Mn]
Si+2 (FeO)=(SiO2)+2 [Fe]
5Si+2 (P2O5)=5 (SiO2)+4 [P]
Converter final slag composition after carrying out reduction and content is as listed in table 2:
Table 2:
| Composition | SiO2 | Al2O3 | CaO | MgO | TFe | MnO | f-CaO | P2O5 |
| Content (%) | 28.75 | 1.24 | 40.52 | 9.85 | 2.50 | 0.28 | 0.38 | 0.20 |
Contrast visible through table 1, table 2, TFe, MnO, the P in slag after reduction2O5Substantially reducing, it is in slag
Content substantially zeroed, the Fe thinking in former slag that therefore can approximate, Mn, P element fully enter in molten steel, after separation
Molten steel be used as phosphorous steel grade alloy, the steel grade demand to phosphorus can be met, also consequently reduce phosphorous steel grade manganese class close
The usage amount of gold, saves corresponding cost.And after the slag of P content essentially zero can being separated, it is re-used as
The raw material of pneumatic steelmaking dephosphorization uses.
Meanwhile, it is shown in Table 2, along with SiO2Increase reduction after the basicity of slag also decrease, along with the fall of basicity of slag
Low, the content of the free calcium oxide f-CaO in slag also decreases, and can be approximately considered its content is zero, therefore after reduction
Slag can directly as produce cement raw material use.
Claims (3)
1. a method that is modified to converter finishing slag and that reduce, it is characterised in that after converter tapping, by adding in slag
Add carburant, ferrosilicon, the Fe in slag, Mn, P element are reverted in molten steel, and by containing Fe, Mn, P element
The molten steel slag modified with dephosphorization is separated, and each re-uses；Concrete method step is as follows:
1) converter is normally tapped, and after arriving zero-bit, adds carburant at once in slag；
2) addition carburant is after 1 minute, then adds ferrosilicon in slag；
3) addition ferrosilicon is after 3-5 minute, and grate is tapped, and tapping hole is blocked up tight by front floating plug of tapping, and during tapping, converter is straight
Connect and shake 95 ° with prestissimo, steel stream near the outer edge of ladle, by containing Fe, Mn, P element molten steel rapid
Overturning enters in the mold of furnace rear；
4) having gone out steel and carried out deslagging, and slag is carried out water-spraying control, the slag after modified with reduction is used as cement raw material and uses,
Or it is reused for smelting molten steel as converter molten steel raw materials for metallurgy to use；
5) it is little steel ingot by pouring in furnace rear mold containing Fe, Mn, the molten steel cooled and solidified of P element, uses with alloy form
In the smelting of phosphorous steel grade.
Method that is the most according to claim 1 a kind of modified to converter finishing slag and that reduce, it is characterised in that described increasing
Carbon agent be carbon containing be the carburant of 90%, the addition of carburant be slag per ton add 5-10Kg carburant.
Method that is the most according to claim 1 a kind of modified to converter finishing slag and that reduce, it is characterised in that described silicon
Ferrum be silicon content be the ferrosilicon of 75%, the addition of ferrosilicon be slag per ton add 80-90Kg ferrosilicon.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510081021.5A CN105986054A (en) | 2015-02-13 | 2015-02-13 | Method for modifying and reducing converter final slag |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510081021.5A CN105986054A (en) | 2015-02-13 | 2015-02-13 | Method for modifying and reducing converter final slag |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105986054A true CN105986054A (en) | 2016-10-05 |
Family
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| CN201510081021.5A Pending CN105986054A (en) | 2015-02-13 | 2015-02-13 | Method for modifying and reducing converter final slag |
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| Country | Link |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108504799A (en) * | 2018-05-15 | 2018-09-07 | 鞍钢股份有限公司 | Method for reducing FeO content in final slag in molten converter slag modification |
| CN111850239A (en) * | 2020-08-12 | 2020-10-30 | 宝武集团鄂城钢铁有限公司 | LF furnace refining method for smelting phosphorus-containing steel by using converter high-phosphorus slag |
| CN114672607A (en) * | 2022-03-18 | 2022-06-28 | 中国重型机械研究院股份公司 | Method for reducing iron oxide on line by converter deslagging |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101194028A (en) * | 2005-09-12 | 2008-06-04 | 安东·梅齐 | Method for treating metallurgical slag |
| CN101880755A (en) * | 2010-06-13 | 2010-11-10 | 东北大学 | Method for preparing high-phosphorus pig iron by using dephosphorized converter slag |
| CN102534070A (en) * | 2012-02-07 | 2012-07-04 | 中冶南方工程技术有限公司 | Method for processing convertor steelmaking slag |
| CN103740869A (en) * | 2013-08-30 | 2014-04-23 | 新疆八一钢铁股份有限公司 | Process for making high-phosphor slag steel |
| CN103930574A (en) * | 2012-06-27 | 2014-07-16 | 新日铁住金株式会社 | Steel slag reduction equipment and steel slag reduction system |
-
2015
- 2015-02-13 CN CN201510081021.5A patent/CN105986054A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101194028A (en) * | 2005-09-12 | 2008-06-04 | 安东·梅齐 | Method for treating metallurgical slag |
| CN101880755A (en) * | 2010-06-13 | 2010-11-10 | 东北大学 | Method for preparing high-phosphorus pig iron by using dephosphorized converter slag |
| CN102534070A (en) * | 2012-02-07 | 2012-07-04 | 中冶南方工程技术有限公司 | Method for processing convertor steelmaking slag |
| CN103930574A (en) * | 2012-06-27 | 2014-07-16 | 新日铁住金株式会社 | Steel slag reduction equipment and steel slag reduction system |
| CN103740869A (en) * | 2013-08-30 | 2014-04-23 | 新疆八一钢铁股份有限公司 | Process for making high-phosphor slag steel |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108504799A (en) * | 2018-05-15 | 2018-09-07 | 鞍钢股份有限公司 | Method for reducing FeO content in final slag in molten converter slag modification |
| CN108504799B (en) * | 2018-05-15 | 2019-08-27 | 鞍钢股份有限公司 | Method for reducing FeO content in final slag in molten converter slag modification |
| CN111850239A (en) * | 2020-08-12 | 2020-10-30 | 宝武集团鄂城钢铁有限公司 | LF furnace refining method for smelting phosphorus-containing steel by using converter high-phosphorus slag |
| CN114672607A (en) * | 2022-03-18 | 2022-06-28 | 中国重型机械研究院股份公司 | Method for reducing iron oxide on line by converter deslagging |
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