CN103667577A - 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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- CN103667577A CN103667577A CN201310714954.4A CN201310714954A CN103667577A CN 103667577 A CN103667577 A CN 103667577A CN 201310714954 A CN201310714954 A CN 201310714954A CN 103667577 A CN103667577 A CN 103667577A
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- molten iron
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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 Liquid Iron Pretreatment Technology field, 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 the mode of sustainable development of focusing on cost, Pay attention to benefits into.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 modes.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 because once investment is larger, production run expense is higher, for the larger investment pressure of medium and small steel enterprise's existence.For there is no the medium and small steel of desulfurizing iron pre-treatment equipment, do not look forward to, main dependence sacrificed 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, this method molten steel sulfur content fluctuation is larger, control sulphur ability is very limited, larger to low-sulfur steel grade 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 and there is very large realistic meaning.
Hot metal mixer/car is the unmatched visual plant of medium and small steel enterprise's alleviation ironmaking-steel-making ability, 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 in hot metal mixer/car, adopts blowing process, and there is no relevant report about utilizing hot metal mixer/car to carry out desulfurization toward the process procedure of hot metal ladle hot metal charging.
Patent documentation CN 101649367A and CN 100482809C, it openly adopts the method for carrier gas blowing desulfurization agent in hot metal mixer/car, to realize desulfurizing iron, the method is carried out desulfurization using hot metal mixer/car as single molten iron container, dynamic conditions is bad, has 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 that converter operation returns 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 are not done requirement, and surplus is Fe and other inevitable residual element.The method utilize 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, molten iron potential energy is as melting bath stirring power.Continue to add and the amount of tapping a blast furnace small-particle sweetening agent in proportion converting iron shock zone, so that 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, in conjunction with hot metal mixer/car flow that taps a blast furnace, calculate sweetening agent and add 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, kg/s toward hot metal ladle;
V
convert iron: hot metal mixer/car unit time is converted iron speed, kg/s toward hot metal ladle;
W
[S] 0: the initial element sulphur content of molten iron in hot metal mixer/car, %;
W
[S] 1: hot metal mixer/car has been converted after molten iron in hot metal ladle, molten iron target molten iron element sulphur content, %;
W
[CaO]: CaO content in sweetening agent, %;
η: sweetening agent utilising efficiency;
2, convert the iron stage: 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, immediate unlock rotary conveyor by sweetening agent (pre-melted desulfurizing agent or adopt the autogamy type sweetening agents such as lime/calcium carbide, fluorite, aluminum shot) by feed bin chute along with adding that flowing molten iron continues to molten iron shock zone, realize molten iron and convert 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, at hot metal charging, add 0～100kg small-particle fluorite mid-term.
3, in the slagging-off stage: after converting iron and finishing, molten iron surface slag is taken off/pull out and be more than 90%, molten iron returns sulphur rate lower than 5%, get as required molten steel sample, 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 treatment is complete.
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 is converted 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) be that blast furnace or external refining operation reduce desulfurization load, strengthen process matching ability.
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 ℃, hot metal ladle plan dress 120t molten iron, the about 6.2min of whole hot metal charging process.
In hot metal mixer hot metal charging process, to hot metal ladle molten iron shock zone, continue to add the pre-melted desulfurizing agent of 1mm～3mm, sweetening agent main component is CaO:68%, SiO
2: 2.5%, MgO:3.5%, CaF
2: 1.8%, Al
2o
3: 10%; 1275 ℃ of fusing points.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, with overhead traveling crane, hot metal ladle is winched to and drags for slag station, pull fast molten iron surface slag out 95%, after processing, 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 ℃, hot metal ladle plan dress 80t molten iron, the about 4.8min of whole hot metal charging process.
In hot metal mixer hot metal charging process, to hot metal ladle molten iron shock zone, continue to add the autogamy type sweetening agent of 1mm～5mm, sweetening agent (lime: fluorite: aluminum shot=8:0.7:1.3) amount 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, with overhead traveling crane, hot metal ladle is winched to and drags for slag station, pull fast molten iron surface slag out 93%, after processing, 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 explanation, above embodiment is only unrestricted so that technical scheme of the present invention to be described.Although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can carry out the modification in parameter area or be equal to replacement 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 claim scope 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, kg/s toward hot metal ladle;
V
convert iron: hot metal mixer/car unit time is converted iron speed, kg/s toward hot metal ladle;
W
[S] 0: the initial element sulphur content of molten iron in hot metal mixer/car, %;
W
[S] 1: hot metal mixer/car has been converted after molten iron in hot metal ladle, molten iron target molten iron element sulphur content, %;
W
[CaO]: CaO content in sweetening agent, %;
η: sweetening agent utilising efficiency;
(2) convert the iron stage: 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, open rotary conveyor by sweetening agent by feed bin chute along with adding that flowing molten iron continues to molten iron shock zone, sweetening agent particle size range is 1mm～5mm, sweetening agent adds speed 0.5～2.0kg/s; At hot metal charging, add 0～100kg small-particle fluorite mid-term;
(3) the slagging-off stage: after converting iron and finishing, molten iron surface slag is taken off/pull out and be more than 90%, molten iron returns sulphur rate lower than 5%, and 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 treatment is complete.
2. method according to claim 1, is characterized in that, described sweetening agent is pre-melted desulfurizing agent or adopts lime/calcium carbide, fluorite, aluminum shot autogamy type sweetening agent.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105018678A (en) * | 2015-08-04 | 2015-11-04 | 承德建龙特殊钢有限公司 | Steel-making desulfurizing agent, desulfurizing method thereof and steel making method |
| CN113106183A (en) * | 2021-04-17 | 2021-07-13 | 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 |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105018678A (en) * | 2015-08-04 | 2015-11-04 | 承德建龙特殊钢有限公司 | Steel-making desulfurizing agent, desulfurizing method thereof and steel making method |
| 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 |
| CN113106183A (en) * | 2021-04-17 | 2021-07-13 | 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 |
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