CN103667577B - Molten iron desulphurization method for molten iron mixing process - Google Patents
Molten iron desulphurization method for molten iron mixing process Download PDFInfo
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- CN103667577B CN103667577B CN201310714954.4A CN201310714954A CN103667577B CN 103667577 B CN103667577 B CN 103667577B CN 201310714954 A CN201310714954 A CN 201310714954A CN 103667577 B CN103667577 B CN 103667577B
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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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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The invention discloses a molten iron desulphurization method for a molten iron mixing process, and belongs to the technical field of molten iron preprocessing. A process of adding molten iron into a molten iron ladle from an iron mixing furnace/car is utilized as the desulphurization reaction time of the molten iron in a molten pool and the potential energy of the molten iron is utilized as the stirring power of the molten pool; a granular desulphurization agent with the proportion the same as the iron output quantity is continuously added in a molten iron mixing impact region through a simple device, so that the best desulphurization environment is created in the molten iron mixing impact region during the whole dynamic molten iron mixing process; when the sulfur-containing molten iron flowing at high speed enters the molten pool of the molten iron, quick and efficient desulphurization is achieved. The method is high in desulphurization efficiency, simple in process, easy and convenient to operate and low in process cost.
Description
Technical field
The invention belongs to technical field of hot metal pretreatment, particularly a kind of molten iron desulfurizing method of hot metal charging process.
Background technology
Along with the continued downturn in market, iron and steel enterprise from before extensive expansion mode change into focus on cost, Pay attention to benefits mode of sustainable development.Iron and steel enterprise is more and more careful to the investment of newly added equipment on the one hand, on the other hand in the work of links Efforts To Develop cost efficiency, to strengthen enterprise competitiveness.At present, the control for molten steel sulfur content is mainly divided into blast furnace internal control sulphur, desulfurizing iron pre-treatment and external refining desulfuration three class mode.External refining desulfuration is mainly used in the production of low-sulfur steel, and production cost is higher; Desulfurizing iron pre-treatment needs proprietary equipment and place, is the necessary equipment of advanced iron and steel enterprise, but comparatively large owing to once investing, and production run costly, exists larger investment pressure for medium and small steel enterprise.The medium and small steel enterprise equipped for not having desulfurizing iron pre-treatment, main dependence sacrifices the object that blast furnace economic target (promote furnace temperature, improve basicity, strengthen the quantity of slag, control feed stock for blast furnace sulphur content etc.) reaches molten iron control sulphur, the fluctuation of this method molten steel sulfur content is larger, control sulphur ability is very limited, larger to low-sulphur steel desulfurization load in smelting.Therefore, for medium and small steel enterprise, on the basis of existing Production Flow Chart, equipment, carry out suitable technological transformation and solve/alleviate molten iron sulphur problem there is very large realistic meaning.
Hot metal mixer/car is that the unmatched visual plant of ironmaking-steel making ability is alleviated in medium and small steel enterprise, but its functional localization single (storing molten iron, hot-metal insulating etc.), Slack Time is more simultaneously, and functional development potentiality are larger.At present the report of relevant sulfur removal technology aspect is mainly and adopts blowing process in hot metal mixer/car, and carries out desulfurization about the process procedure utilizing hot metal mixer/car toward hot metal ladle hot metal charging and do not have relevant report.
Patent documentation CN 101649367A and CN 100482809C, it openly adopts the method for carrier gas blowing desulfurization agent to realize desulfurizing iron in hot metal mixer/car, hot metal mixer/car is carried out desulfurization as single molten iron container by the method, dynamic conditions is bad, there is dead band, and efficiency is not high, and convert in iron process toward hot metal ladle, desulfurization slag easily enters in hot metal ladle, causes converter procedure to return sulphur, and in hot metal mixer/car, the removal of desulfurization slag is also a great problem simultaneously.
Summary of the invention
The object of the present invention is to provide a kind of molten iron desulfurizing method of hot metal charging process, described hot metal composition is, C:3.5% ~ 4.5%; Si:0.2% ~ 0.5%, S:0.03% ~ 0.06%, Mn, P content does not do requirement, and surplus is Fe and other inevitable residual element.The method utilizes hot metal mixer/car toward the process (4 ~ 10min) of hot metal ladle hot metal charging as the desulfurizing iron reaction times in molten bath, and molten iron potential energy is as melting bath stirring power.Continue to add and go out iron small-particle sweetening agent in proportion converting iron shock zone, to make in the dynamic process of whole hot metal charging, build best desulfurization environment converting iron shock zone, when swiftly flowing sulfur-bearing molten iron enters iron bath, realize desulfurization quickly and efficiently.Present method iron bath stirs fully, and desulfuration efficiency is high, easy and simple to handle, operation expense is low.
Technological process comprises following steps:
1, Theoretical Calculation: according to hot metal mixer/car hot metal charging speed, the initial sulphur content of molten iron, desulfurized molten iron target sulphur content, to tap a blast furnace flow in conjunction with hot metal mixer/car, calculates sweetening agent and adds speed.
Sweetening agent feed rate calculation formula is as follows:
V
sweetening agent=V
convert iron× (W
[S] 0-W
[S] 1) [56 × 2/32]/W
[CaO]/ η
Remarks: V
sweetening agent: the unit time adds the feed rate of solid desulfurating agent toward hot metal ladle, kg/s;
V
convert iron: hot metal mixer/car unit time converts iron speed, kg/s toward hot metal ladle;
W
[S] 0: the initial sulfur content of molten iron in hot metal mixer/car, %;
W
[S] 1: after hot metal mixer/car has converted molten iron in hot metal ladle, molten iron target molten iron sulfur content, %;
W
[CaO]: CaO content in sweetening agent, %;
η: sweetening agent utilising efficiency;
2, the iron stage is converted: inclination hot metal mixer/car is blended into the molten iron of hot metal ladle total volume 70% ~ 80% to hot metal ladle.At hot metal charging simultaneously, what sweetening agent (pre-melted desulfurizing agent or employing lime/calcium carbide, fluorite, aluminum shot etc. are from distribution type sweetening agent) was continued to molten iron shock zone along with flowing molten iron by feed bin chute by immediate unlock rotary conveyor adds, and realizes molten iron and converts the omnidistance uniform high-efficiency desulfurization of iron stage.Sweetening agent particle size range is 1mm ~ 5mm, and sweetening agent adds speed 0.5 ~ 2.0kg/s.Depending on slag blanket multiviscosisty situation in reinforced process, add 0 ~ 100kg small-particle fluorite mid-term at hot metal charging.
3, remove the gred the stage: after converting iron and terminating, molten iron surface slag is taken off/pull out more than 90%, molten iron returns sulphur rate lower than 5%, get molten steel sample as required, slag specimen detects.
4, overhead traveling crane handling: winch to converter molten iron region to be installed by overhead traveling crane after molten iron surface slag processes.
Due to hot metal ladle capacity and hot metal mixer/car design dimension specification difference, hot metal mixer/car hot metal charging speed range is 100 ~ 400kg/s, according to each iron and steel enterprise's hot metal ladle differing capacities (50t ~ 200t), it is 4 ~ 10min that hot metal mixer/car converts iron time range to hot metal ladle.
Compared with prior art, the invention has the beneficial effects as follows:
1) the omnidistance evenly desulfurization of whole hot metal charging process, the desulfurization time length is long, and desulfurization degree is high.
2) for blast furnace or external refining operation reduce desulfurization load, process matching ability is strengthened.
3) reinforced simple, reaction desulfuration slag is easy to remove, and time sulphur rate is low, and production and operation cost is low.
Case study on implementation 1
Melten iron in hot-metal mixer composition is C:0.41%, Si:0.38%, Mn:0.18%, S:0.049%, P:0.082%.Molten iron hot metal mixer hot metal charging speed 320kg/s, molten iron temperature is 1350 DEG C, and hot metal ladle plan dress 120t molten iron, whole hot metal charging process is about 6.2min.
In hot metal mixer hot metal charging process, continue to hot metal ladle molten iron shock zone the pre-melted desulfurizing agent adding 1mm ~ 3mm, sweetening agent main component is CaO:68%, SiO
2: 2.5%, MgO:3.5%, CaF
2: 1.8%, Al
2o
3: 10%; Fusing point 1275 DEG C.It is 0.81kg/s that sweetening agent adds speed, and amounting to a ton iron consumption is 2.5kg/t
iron.
Wait to have converted iron, hot metal ladle to be winched to overhead traveling crane and drag for slag station, pull molten iron surface slag out 95% fast, after process, molten steel sulfur content is 0.011%, and desulfurization degree reaches 77%.After having dragged for slag, foundry ladle overhead traveling crane is winched to converter region to be installed.
Case study on implementation 2
Melten iron in hot-metal mixer composition is C:0.40%, Si:0.35%, Mn:0.15%, S:0.035%, P:0.105%.Molten iron hot metal mixer hot metal charging speed 280kg/s, molten iron temperature is 1375 DEG C, and hot metal ladle plan dress 80t molten iron, whole hot metal charging process is about 4.8min.
In hot metal mixer hot metal charging process, to hot metal ladle molten iron shock zone continue to add 1mm ~ 5mm from distribution type sweetening agent, sweetening agent (lime: fluorite: aluminum shot=8:0.7:1.3) amounts to 280kg.It is 1.0kg/s that sweetening agent adds speed, and amounting to a ton iron consumption is 3.5kg/t
iron.
Wait to have converted iron, hot metal ladle to be winched to overhead traveling crane and drag for slag station, pull molten iron surface slag out 93% fast, after process, molten steel sulfur content is 0.007%, and desulfurization degree reaches 80%.After having dragged for slag, foundry ladle overhead traveling crane is winched to converter region to be installed.
Finally illustrate, above embodiment is only to illustrate technical scheme of the present invention and unrestricted.Although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that, the amendment in parameter area can be carried out or be equal to replacing to technical scheme of the present invention, and not departing from aim and the scope of technical solution of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (2)
1. a molten iron desulfurizing method for hot metal charging process, is characterized in that, the technical parameter of processing step and control is as follows:
(1) calculate sweetening agent and add speed
Sweetening agent adds speed V
sweetening agentcalculation formula as follows:
V
sweetening agent=V
convert iron× (W
[S] 0-W
[S] 1) [56 × 2/32]/W
[CaO]/ η
V
sweetening agent: the unit time adds the feed rate of solid desulfurating agent toward hot metal ladle, kg/s;
V
convert iron: hot metal mixer/car unit time converts iron speed, kg/s toward hot metal ladle;
W
[S] 0: the initial sulfur content of molten iron in hot metal mixer/car, %;
W
[S] 1: after hot metal mixer/car has converted molten iron in hot metal ladle, molten iron target molten iron sulfur content, %;
W
[CaO]: CaO content in sweetening agent, %;
η: sweetening agent utilising efficiency;
(2) the iron stage is converted: inclination hot metal mixer/car is blended into the molten iron of hot metal ladle total volume 70% ~ 80% to hot metal ladle; At hot metal charging simultaneously, what sweetening agent was continued to molten iron shock zone along with flowing molten iron by feed bin chute by unlatching rotary conveyor adds, and sweetening agent particle size range is 1mm ~ 5mm, and sweetening agent adds speed 0.5 ~ 2.0kg/s; 0 ~ 100kg small-particle fluorite is added mid-term at hot metal charging;
(3) remove the gred the stage: after converting iron and terminating, molten iron surface slag is taken off/pull out more than 90%, molten iron returns sulphur rate lower than 5%, slag specimen detects;
(4) overhead traveling crane handling: winch to converter molten iron region to be installed by overhead traveling crane after molten iron surface slag processes.
2. method according to claim 1, is characterized in that, described sweetening agent is pre-melted desulfurizing agent or adopts lime/calcium carbide and fluorite, aluminum shot from distribution type sweetening agent.
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| CN103667577B true CN103667577B (en) | 2015-05-06 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105018678B (en) * | 2015-08-04 | 2018-03-27 | 承德建龙特殊钢有限公司 | A kind of steel desulfurization agent and its sulfur method and method for making steel |
| CN113106183B (en) * | 2021-04-17 | 2022-11-11 | 乌海市包钢万腾钢铁有限责任公司 | Molten iron desulfurizer adding method for steelmaking |
| CN115386682A (en) * | 2022-08-30 | 2022-11-25 | 江苏沙钢集团有限公司 | Two-step deep iron desulphurization device and process method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS544219A (en) * | 1977-06-10 | 1979-01-12 | Sumitomo Metal Ind Ltd | Hot iron desulfurizing method |
| KR100325320B1 (en) * | 1997-03-31 | 2002-07-04 | 이구택 | Hot metal desulfurizing agent used in mechanic agitation type desulfurization |
| CN101676410A (en) * | 2008-09-18 | 2010-03-24 | 宝山钢铁股份有限公司 | Aluminum slag, desulfurizer and desulfurizing method for desulfurization of high silicon molten iron |
| CN202898458U (en) * | 2012-10-20 | 2013-04-24 | 江阴兴澄特种钢铁有限公司 | Liquid iron desulfuration lime discharging pipe |
-
2013
- 2013-12-20 CN CN201310714954.4A patent/CN103667577B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS544219A (en) * | 1977-06-10 | 1979-01-12 | Sumitomo Metal Ind Ltd | Hot iron desulfurizing method |
| KR100325320B1 (en) * | 1997-03-31 | 2002-07-04 | 이구택 | Hot metal desulfurizing agent used in mechanic agitation type desulfurization |
| CN101676410A (en) * | 2008-09-18 | 2010-03-24 | 宝山钢铁股份有限公司 | Aluminum slag, desulfurizer and desulfurizing method for desulfurization of high silicon molten iron |
| CN202898458U (en) * | 2012-10-20 | 2013-04-24 | 江阴兴澄特种钢铁有限公司 | Liquid iron desulfuration lime discharging pipe |
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