CN106119459A - Oxygen top-blown converter stays the dephosphorization method of slag - Google Patents

Oxygen top-blown converter stays the dephosphorization method of slag Download PDF

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Publication number
CN106119459A
CN106119459A CN201610774034.5A CN201610774034A CN106119459A CN 106119459 A CN106119459 A CN 106119459A CN 201610774034 A CN201610774034 A CN 201610774034A CN 106119459 A CN106119459 A CN 106119459A
Authority
CN
China
Prior art keywords
slag
rifle
oxygen
dephosphorization
converter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201610774034.5A
Other languages
Chinese (zh)
Inventor
么洪勇
郝华强
陈建军
孙玉霞
刘善喜
王振刚
李硕
项有兵
张虎成
常凤
王文辉
郑虎
林文龙
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tangshan Iron and Steel Group Co Ltd
Original Assignee
Tangshan Iron and Steel Group Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tangshan Iron and Steel Group Co Ltd filed Critical Tangshan Iron and Steel Group Co Ltd
Priority to CN201610774034.5A priority Critical patent/CN106119459A/en
Publication of CN106119459A publication Critical patent/CN106119459A/en
Pending legal-status Critical Current

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Classifications

    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28Manufacture of steel in the converter
    • C21C5/36Processes yielding slags of special composition
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/20Recycling

Abstract

The invention discloses a kind of oxygen top-blown converter and stay the dephosphorization method of slag, it is before slag splashing, after tapping, stay interpolation Dephosphorising agent in the slag in converter, then use oxygen rifle top blast noble gas to carry out slag splashing operation, the initial slag smelted as next heat after slag dephosphorization.Remaining Slag Operation on LD Converter and slag dephosphorization technology are combined by this method, the phosphorus content stayed in slag can be effectively reduced, the amount of bringing into of phosphorus when reducing next heat converter smelting, it is thus possible to lime adding amount when reducing next heat converter smelting, reduces converter smelting cost.The present invention can take off the part P elements in the slag staying converter, and the smelting process quantity of slag is little, heat waste is low and iron loss is few, and slag dephosphorization effect is good, significantly reduces smelting cost.

Description

Oxygen top-blown converter stays the dephosphorization method of slag
Technical field
The invention belongs to steelmaking technical field, a kind of oxygen top-blown converter stays the dephosphorization method of slag.
Background technology
Remaining Slag Operation on LD Converter in phase early 1980s just it has been proposed that owing to operating after not having grasp to stay slag Safe Problem, occurs spraying greatly at hot metal charging often, and therefore remaining slag operation popularization and application are restricted.Oxygen top-blown converter stays slag Operation can be greatly lowered steel technology, saves Calx, can quickly bring up high alkalinity oxidizing slag at the initial stage of bessemerizing, Be conducive to improving production efficiency, and there is significant economic benefit;At present under the pressure of the pressure of production cost, a lot of enterprises have taked The precautionary measures of effect implement remaining slag operation.The elements such as the main calcic of converter slag, magnesium, ferrum, silicon, phosphorus, phosphorus is to most steel All a kind of harmful element for Zhong, in steel phosphorous high time, the plasticity of steel and toughness can be made to reduce, i.e. occur that the fragility of steel is existing As, more serious during low temperature, the most cold short, therefore make great efforts to reduce the phosphorus content in steel be metallargist all the time The target of struggle.
The Chinese patent application of publication number CN105420490A provides a kind of method that vessel slag is carried out dephosphorization, its bag Include: under the conditions of predetermined atmosphere, melted vessel slag introducing incandescent coke heap is carried out carbon thermal reduction dephosphorization;Not only take full advantage of The latent heat of melted vessel slag, and when melted vessel slag is through red-hot broken Jiao, substantially improve the dynamic conditions of dephosphorization, de- Phosphorus efficiency is high.The method energy consumption is low, and technique is simple, but requires the temperature flowing temperature more than raw material vessel slag liquid of broken Jiao Dui, And be a kind of converter slag is rolled off the production line after method of comprehensive utilization.
The Chinese patent of publication number CN101597669A provides a kind of top and bottom combined blown converter ferrum under the conditions of slag splashing The method of water dephosphorization, the method uses top-submerged lance noble gas to carry out slag splashing, the hopper being provided above by converter to The Dephosphorising agent based on Calx, iron ore and fluorite is added in molten iron bath face, supplies oxygen supply by oxygen rifle from top to molten iron bath face Gas, by converter bottom gas supply system to molten steel internal supply stirring gas.The method is by the effective profit of slag splashing operation With the decarbonized slag of previous stove and protection furnace lining, it is primarily directed to the molten steel decarburization after spattering slag.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of oxygen top-blown converter and stays the dephosphorization method of slag, effectively to drop Low steel grade phosphorus content.
For solving above-mentioned technical problem, the technical solution used in the present invention is: before slag splashing, stays after tapping Slag in converter adds Dephosphorising agent, then uses oxygen rifle top blast noble gas to carry out slag splashing operation, after slag dephosphorization The initial slag smelted as next heat.
Dephosphorising agent of the present invention is carbon dust.In tapping of the present invention during C > 0.08wt%, carbon dust addition be 20~ 27kg/ ton stays slag;In tapping during 0.04wt%≤C≤0.08wt%, carbon dust addition is that 27~40kg/ tons stay slag;C < in tapping During 0.04wt%, carbon dust addition is that 40~54kg/ tons stay slag.The granularity of described carbon dust is 0.4cm~0.6cm.
In tapping of the present invention during C > 0.08wt%, oxygen rifle starts to spatter slag in basic rifle position of blowing;0.04wt% in tapping During≤C≤0.08wt%, oxygen rifle is starting to spatter slag higher than basic rifle position 300~400mm of blowing, and drops rifle after the flourishing disappearance of fire door To basic rifle position of blowing;In tapping during C < 0.04wt%, oxygen rifle is starting to spatter slag higher than basic rifle position 800~900mm of blowing, and treats Rifle drops after fire door flame extinction to higher than basic rifle position 500~600mm of blowing.
Use and have the beneficial effects that produced by technique scheme: the present invention is by Remaining Slag Operation on LD Converter and stove Slag dephosphorization technology combines, and can effectively reduce the phosphorus content stayed in slag, the band of phosphorus when reducing next heat converter smelting Enter amount, it is thus possible to lime adding amount when reducing next heat converter smelting, reduce converter smelting cost.The present invention can take off and stay Part P elements in the slag of converter, the smelting process quantity of slag is little, heat waste is low and iron loss is few, and slag dephosphorization effect is good, significantly Reduce smelting cost.
Accompanying drawing explanation
The present invention is further detailed explanation with detailed description of the invention below in conjunction with the accompanying drawings.
Fig. 1 is the process flow diagram of converter smelting of the present invention;
Fig. 2 is the oxygen lance position schematic diagram that remained converter slag of the present invention spatters slag.
Detailed description of the invention
This oxygen top-blown converter stays the dephosphorization method of slag to use following technique: 1, shown in Fig. 1, use before slag splashing, After having gone out steel, interpolation Dephosphorising agent-carbon dust, the addition of carbon dust in the converter of slag is stayed by the high hopper above converter flue Depending on carbon content in tapping according to this heat terminal;Then oxygen rifle top blast noble gas, preferably nitrogen is used to carry out spattering slag Furnace retaining operates, and the rifle position spattering slag determines according to the physical property of slag.After slag splashing operation, in converter, take off the slag of part phosphorus The initial slag smelted as next heat, next heat can reduce slag making according to staying slag situation when smelting in smelting process The input amount of agent-Calx.
2, carbon dust Adding Way and addition: added by high hopper before spattering slag after having gone out steel, addition opportunity is that converter goes out Complete steel shakes positive furnace rear and adds.The granularity of carbon dust is preferably 0.4cm~0.6cm, and addition is according to the carbon in the tapping of this heat of converter Situation determines, is specifically shown in Table 1.
Table 1: carbon dust addition
Described in table 1 stay slag refer to tapping after stay in converter slag.
3, spattering slag rifle position to require: shown in Fig. 2, during C > 0.08wt%, after adding coke, oxygen rifle is opened when blowing basic rifle position Begin to spatter slag, after fire door slag particle reduces, progressively drop rifle.During 0.04wt%≤C≤0.08wt%, after adding coke, oxygen rifle is higher than blowing Basic rifle position 300~400mm starts to spatter slag, progressively drops rifle to the basic rifle position of blowing after the flourishing disappearance of fire door, and fire door slag particle is dilute Rifle the most progressively drops after Shao.During C < 0.04wt%, after adding coke, treat that nitrogen is opened, rapidly oxygen rifle is mentioned higher than the basic rifle that blows Position 800~900mm, prevent slag from overflowing, progressively drop after fire door flame extinction rifle to be higher than blowing basic rifle position 500~ 600mm, progressively drops rifle after observing fire door slag particle rareness.Spattering the slag time mainly suitably adjusts according to slag fluidity, is normally 3min。
4, remaining slag operation requires: slag spatters dry after carrying rifle, first evenly laid out for slag in big face, then converter has been shaken and has added Enter steel scrap (iron making in Fig. 1 adds steel scrap process), then to big face grate 1~2 times, it is necessary to assure steel scrap is pressed in above slag.
5, blowing and catch carbon require: converting process (starting in Fig. 1 is blown, and oxygen process is determined in thermometric, sampling) is according to flame Normal charging;Staying slag alternative part slag former because of a upper stove, lime adding amount is fewer than value of calculation adds 300~500 kilograms.Draw Suitably during carbon pour out part slag, it is to avoid stay that the quantity of slag is excessive affects normal operating more, can first fall if the quantity of slag is excessive in stove after Chu Gang Go out part slag, then spatter slag operation carrying out.
Embodiment 1-9: this oxygen top-blown converter stays the concrete technology of the dephosphorization method of slag as described below.
Smelting steel grade is low-alloy HRB400B, molten iron charge weight 70 tons, steel scrap charge weight 5 tons;Catch carbon makes aim carbon exist Below 0.11wt%, average out to 0.052wt%;Terminal mean temperature 1663 DEG C;Terminal FeO content is more than 15.15wt%, average out to 17.48wt%;Basicity average out to 2.2;The average addition of coke powder (carbon dust) is 144kg/ stove.Slag dephosphorization rate 31.02%~ Between 43.42%, meansigma methods is 36%;The technological parameter that each embodiment is concrete is shown in Table 2.
Table 2: the technological parameter of each embodiment
It is oxygen rifle limit inferior rifle position that table 2 spatters the 998mm in slag rifle position " 998-1980 ".
After using this method, reducing Calx 300~500kg/ stove, equivalent ton steel cost saves 2~3 yuan;Empirically data Saving the average 200~500 kilograms/stove of metallic iron, equivalent ton steel cost saves 4~9 yuan;Every stove adds Dephosphorising agent 34~65kg, Increasing cost of material 74~141 yuan/stove, equivalent ton steel cost increases by 1~2 yuan;Cost is added up to reduce by 5~10 yuan.Remaining slag operation The slag effectively utilizing previous heat to remain reduces steel technology, saves Calx, if the slag stayed first carries out dephosphorization, can subtract Few heat waste and iron loss improve dephosphorization efficiency simultaneously, reduce smelting cost.

Claims (5)

1. an oxygen top-blown converter stays the dephosphorization method of slag, it is characterised in that: before slag splashing, after tapping, stay converter Interior slag adds Dephosphorising agent, then uses oxygen rifle top blast noble gas to carry out slag splashing operation, conduct after slag dephosphorization The initial slag that next heat is smelted.
Oxygen top-blown converter the most according to claim 1 stays the dephosphorization method of slag, it is characterised in that: described Dephosphorising agent is carbon Powder.
Oxygen top-blown converter the most according to claim 2 stays the dephosphorization method of slag, it is characterised in that: C > in described tapping During 0.08wt%, carbon dust addition is that 20~27kg/ tons stay slag;In tapping during 0.04wt%≤C≤0.08wt%, carbon dust addition It is that 27~40kg/ tons stay slag;In tapping during C < 0.04wt%, carbon dust addition is that 40~54kg/ tons stay slag.
Oxygen top-blown converter the most according to claim 2 stays the dephosphorization method of slag, it is characterised in that: the granularity of described carbon dust For 0.4cm~0.6cm.
5. the dephosphorization method of slag is stayed according to the oxygen top-blown converter described in claim 1-4 any one, it is characterised in that: institute When stating C > 0.08wt% in tapping, oxygen rifle starts to spatter slag in basic rifle position of blowing;In tapping during 0.04wt%≤C≤0.08wt%, Oxygen rifle is starting to spatter slag higher than basic rifle position 300~400mm of blowing, and drops rifle to basic rifle position of blowing after the flourishing disappearance of fire door; In tapping during C < 0.04wt%, oxygen rifle is starting to spatter slag, after fire door flame extinction higher than basic rifle position 800~900mm of blowing Fall rifle is to higher than basic rifle position 500~600mm of blowing.
CN201610774034.5A 2016-08-31 2016-08-31 Oxygen top-blown converter stays the dephosphorization method of slag Pending CN106119459A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107299181A (en) * 2017-07-19 2017-10-27 华北理工大学 The method of converter gasification dephosphorized slag circulation dephosphorization steel-making
CN107419061A (en) * 2017-08-01 2017-12-01 华北理工大学 Bottom-blowing of converter dust improve gasification dephosphorization effect method
CN111635975A (en) * 2020-06-09 2020-09-08 首钢集团有限公司 Method for recycling converter slag

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1827793A (en) * 2006-03-24 2006-09-06 河北理工大学 Molten slag gasification dephosphorization method during converter splash protection process
CN101597669A (en) * 2009-07-03 2009-12-09 首钢总公司 A kind of under the slag splashing condition method of top and bottom combined blown converter dephosphorization of molten iron
CN103776272A (en) * 2014-03-05 2014-05-07 北京大学 Converter gas mass-energy conversion and CO2 cycle steelmaking method
CN104611500A (en) * 2015-02-27 2015-05-13 马钢(集团)控股有限公司 Method for preventing splashing in iron blending by all slag retention in low-carbon steel smelting process

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1827793A (en) * 2006-03-24 2006-09-06 河北理工大学 Molten slag gasification dephosphorization method during converter splash protection process
CN101597669A (en) * 2009-07-03 2009-12-09 首钢总公司 A kind of under the slag splashing condition method of top and bottom combined blown converter dephosphorization of molten iron
CN103776272A (en) * 2014-03-05 2014-05-07 北京大学 Converter gas mass-energy conversion and CO2 cycle steelmaking method
CN104611500A (en) * 2015-02-27 2015-05-13 马钢(集团)控股有限公司 Method for preventing splashing in iron blending by all slag retention in low-carbon steel smelting process

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107299181A (en) * 2017-07-19 2017-10-27 华北理工大学 The method of converter gasification dephosphorized slag circulation dephosphorization steel-making
CN107419061A (en) * 2017-08-01 2017-12-01 华北理工大学 Bottom-blowing of converter dust improve gasification dephosphorization effect method
CN107419061B (en) * 2017-08-01 2019-10-18 华北理工大学 Bottom-blowing of converter dust improve gasification dephosphorization effect method
CN111635975A (en) * 2020-06-09 2020-09-08 首钢集团有限公司 Method for recycling converter slag

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Application publication date: 20161116