CN102534088A - Process for demanganizing molten iron by utilizing dephosphorizing station - Google Patents
Process for demanganizing molten iron by utilizing dephosphorizing station Download PDFInfo
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- CN102534088A CN102534088A CN2012100209268A CN201210020926A CN102534088A CN 102534088 A CN102534088 A CN 102534088A CN 2012100209268 A CN2012100209268 A CN 2012100209268A CN 201210020926 A CN201210020926 A CN 201210020926A CN 102534088 A CN102534088 A CN 102534088A
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- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention relates to a process for demanganizing molten iron by utilizing a dephosphorizing station. The technical scheme is that: demanganization is performed by using a supply auxiliary system, a power system, a blowing system, a weighing system and an operating system of the existing molten iron dephosphorizing station, wherein oxidized iron skin serves as a demanganizing agent; the temperature of the molten iron is controlled to be between 1,300 and 1,400 DEG C; a top oxygen blowing gun is provided; the oxygen-blowing quantity is adjusted; the temperature of the molten iron is controlled not to be reduced; and the slag alkalinity R is controlled to be less than 1.0. The process has the beneficial effects that: the manganese content of the molten iron is reduced to be 0.05 to 0.10 percent by the process, so the smelting requirement of low-manganese steel grade is met completely, the product quality is improved obviously and the price of each ton of steel is increased to 200 yuan; and the technology for demanganizing the molten iron by utilizing the conventional dephosphorizing station is implemented on the basis of not increasing cost and investment, so the process is high in practicability and wide in application prospect.
Description
Technical field
The present invention relates to a kind of technology of utilizing the dephosphorization station to carry out the molten iron demanganize, belong to metallurgy industry hot metal pretreatment technical field.
Background technology
In smelting iron and steel technology, low manganese product is for guaranteeing product performance, need guarantee that manganese content that molten iron goes into converter is below 0.10%.In the background technology, adopt simple and easy demanganize method during blast furnace casting, promptly when tapping a blast furnace, add the demanganize agent, though this method can the part demanganize, the demanganize rate is very low, and only about 30%, Mn content still reaches 0.20-0.30%, can't satisfy the converter process requirement.If build special molten iron demanganize station, need a large amount of fund inputs.
Summary of the invention
The object of the invention provides a kind of technology of utilizing the dephosphorization station to carry out the molten iron demanganize, utilizes enterprise existing dephosphorization of molten iron station, accomplishes the molten iron demanganize, does not need the substantial contribution input, and demanganize is effective, solves the problems referred to above that exist in the background technology.
Technical scheme of the present invention is: a kind of technology of utilizing the dephosphorization station to carry out the molten iron demanganize comprises following steps:
1. utilize the auxilliary system of confession, power system, injection system, Weighing system, the control system at existing dephosphorization of molten iron station, carry out the demanganize operation;
2. iron scale is adopted in the demanganize agent, and molten iron temperature is controlled at 1300 ℃ to 1400 ℃ intervals; The configuration top blow oxygen lance, the adjustment blowing oxygen quantity, the temperature of control molten iron does not reduce; Control basicity of slag R < 1.0.
Add 10% SiO2 in the demanganize agent, by mass percentage, the demanganize agent is added 20% SiO2 again as 100%.
Process step more specifically: use the hot-metal car of band tipple to run to the processing position of preprocessing station, measure the molten iron liquid level, carry out the thermometric sampling simultaneously; Press the thermometric sampling result and set winding-up, oxygen blast parameter; Begin winding-up, processing begins automatically, and spray gun oxygen rifle descends, after setting the position, begins winding-up; By computer calculates demanganize agent add-on, carry out demanganize according to hot metal composition, demanganize finishes and promotes spray gun and oxygen rifle; Carry out thermometric and sampling again, wait for coupon results simultaneously, the hot metal ladle of tumbling is taken off the demanganize slag; Last hot-metal car is left, and the handling molten iron is blended into converter smelting.
By computer calculates demanganize agent add-on, the demanganize reaction formula is following according to hot metal composition:
[Mn]+1/2(O2)=MnO
[Mn]+(FeO)+(SiO2)=MnO.SiO2+[Fe]
Calculate according to above reaction formula, if with in the molten iron [Mn " take off to 0.06% from 0.30%, press utilising efficiency 0.25 calculating of oxygen among the FeO, molten iron per ton need add demanganize agent 12.6kg.Desiliconization consumes red stone: calculate by sloughing 0.2%Si, need to consume 9.5kg/t demanganize agent.
Reduction 55 gram Mn need 16 gram oxygen or 72 gram FeO; Adopt Fe2O3 then only to need 53.33 grams.In line with the policy and the low-cost principle of comprehensive utilization of resources, selective oxidation iron sheet of the present invention is as the demanganize agent.
About molten iron temperature control, the demanganize reaction only could effectively realize molten iron demanganize reaction under the situation of demanganize agent fusing, and higher molten iron temperature helps the fusing of demanganize agent.But from oxidizing reaction, the demanganize reaction is thermopositive reaction, and molten iron temperature is low more, and the oxidation of manganese is fast more, and terminal point [Mn] is also just low more.The present invention is through experiment showed, temperature in 1300 ℃ to 1400 ℃ intervals, and the reaction equilibrium constant of demanganize does not receive the influence of molten iron temperature basically, keeps steady state value.Under certain blowing oxygen quantity and the oxygen blast rate conditions and under the demanganize agent situation that can fully melt, molten iron temperature is low more in this temperature range, and FeO is high more in the slag, and demanganize speed is big more, and terminal point [Mn " low more.In winding-up demanganize process, cause that the hot metal temperature drop factor has the heat absorption of winding-up stirring, molten iron and iron ladle heat loss through radiation and adding demanganize agent etc.So demanganize winding-up of the present invention needs to consider to carry out oxygen blast temperature control technology, the configuration top blow oxygen lance can not reduce according to the temperature of adjustment blowing oxygen quantity control molten iron.
About basicity of slag control, under certain temperature condition (as T=1400 ℃), basicity of slag has very big influence to the oxidation of manganese in the molten iron, and it is very serious to return manganese during basicity index R=1.9, and the demanganize rate is less than 18%; During R=0.5, do not return the manganese phenomenon, the demanganize rate is up to 74%.Under the low basicity condition, [Si] of molten iron is high more, and demanganize speed is fast more, and the demanganize rate is high more.Under the high basicity condition, demanganize speed is very slow, and the demanganize rate is very low, is generally less than 23%.Add too much CaO in the demanganize agent and can improve basicity of slag, be unfavorable for that demanganize carries out, the present invention obtains optimum through overtesting, control basicity of slag R < 1.0.
Because SiO2 oxygen gesture is lower than MnO, the demanganize reaction always is accompanied by desilication reaction.Add SiO2 and can suppress desilication reaction, promotion demanganize reaction.Behind the SiO2 of interpolation 10%, can make the desiliconization rate reduce by 5.7% in the demanganize agent, the demanganize rate improves 6.7%.
Positively effect of the present invention: adopt the present invention, molten iron manganese is reduced to 0.05-0.10%, satisfies the low manganese steel kind fully and smelts demand, and quality product obtains obviously to promote, and ton steel price increases by 200 yuan/ton; The present invention utilizes existing dephosphorization station to carry out molten iron demanganize technology on the basis that does not increase cost and investment, and feasibility is high, have a extensive future.
Description of drawings
Accompanying drawing 1 is an embodiment of the invention process flow diagram;
Accompanying drawing 2 is the embodiment of the invention one demanganize design sketchs;
Accompanying drawing 3 is the embodiment of the invention two demanganize design sketchs;
Accompanying drawing 4 is the embodiment of the invention three demanganize design sketchs.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described further through embodiment.
With reference to accompanying drawing 1, concrete process step: use the hot-metal car of being with tipple to run to the processing position of preprocessing station, measure the molten iron liquid level, carry out the thermometric sampling simultaneously; Press the thermometric sampling result and set winding-up, oxygen blast parameter; Begin winding-up, processing begins automatically, and spray gun oxygen rifle descends, after setting the position, begins winding-up; By computer calculates demanganize agent add-on, carry out demanganize according to hot metal composition, demanganize finishes and promotes spray gun and oxygen rifle; Carry out thermometric and sampling again, wait for coupon results simultaneously, the hot metal ladle of tumbling is taken off the demanganize slag; Last hot-metal car is left, and the handling molten iron is blended into converter smelting.
Embodiment one
1) dephosphorization station processing parameter
Hot metal supply condition: molten iron temperature (before handling): about 1320 ℃, molten iron original chemical composition: C:>=4.0%, Mn:0.27～0.48%; The molten iron band quantity of slag :≤0.7%; Weight of molten iron in jar: average 45 tons; Molten iron headroom:>=1500mm.
The material unit consumption sees the following form
Condition of power supply: voltage: AC 380V+-10%, 50Hz; Be taken to stainless steel 2# steel-making electric substation.Installed capacity: mechanical means 190Kw; Weight handling equipment 400Kw; Control voltage: AC 220V; SV: DC 24V.
Winding-up and top feeding parameter: in mass ratio 3:1 ratio mixing good CaO and CaF2 pulvis; Adopt air conveying mode to be transported in the storage tank with tank car and store, through fluidization equipment and winding-up metering system pulvis is sprayed in the molten iron through the spray gun that inserts in the molten iron during winding-up.Iron scale as the demanganize agent then adopts the top feeding mode to add.Oxygen blows to the iron liquid level through water cooled oxygen lance, and the rifle position is in the above 0.7--1.5m of liquid level position.
The demanganize effect of embodiment one is seen accompanying drawing 2.
Embodiment two
1) dephosphorization station equipment parameter such as embodiment (one)
2) winding-up situation is following:
The demanganize effect of embodiment two is seen accompanying drawing 3.
Embodiment three
1) dephosphorization station equipment parameter such as embodiment (one)
Annotate: in the test, the lime injection rate is set to minimum value (20kg/min), and the blowing oxygen amount is 25m3/min.Carried out taking off slag operation during the desiliconization.
The demanganize effect of embodiment three is seen accompanying drawing 4.
Claims (4)
1. technology of utilizing the dephosphorization station to carry out the molten iron demanganize is characterized in that comprising following steps:
1. utilize the auxilliary system of confession, power system, injection system, Weighing system, the control system at existing dephosphorization of molten iron station, carry out the demanganize operation;
2. iron scale is adopted in the demanganize agent, and molten iron temperature is controlled at 1300 ℃ to 1400 ℃ intervals; The configuration top blow oxygen lance, the adjustment blowing oxygen quantity, the temperature of control molten iron does not reduce; Control basicity of slag R < 1.0.
2. a kind of technology of utilizing dephosphorization station carry out molten iron demanganize according to claim 1 is characterized in that adding 10% SiO2 in the demanganize agent, and by mass percentage, the demanganize agent is added 20% SiO2 again as 100%.
3. root is according to claim 1 or 2 said a kind of technologies of utilizing the dephosphorization station to carry out the molten iron demanganize; It is characterized in that process step more specifically: use the hot-metal car of being with tipple to run to the processing position of preprocessing station; Measure the molten iron liquid level, carry out the thermometric sampling simultaneously; Press the thermometric sampling result and set winding-up, oxygen blast parameter; Begin winding-up, processing begins automatically, and spray gun oxygen rifle descends, after setting the position, begins winding-up; By computer calculates demanganize agent add-on, carry out demanganize according to hot metal composition, demanganize finishes and promotes spray gun and oxygen rifle; Carry out thermometric and sampling again, wait for coupon results simultaneously, the hot metal ladle of tumbling is taken off the demanganize slag; Last hot-metal car is left, and the handling molten iron is blended into converter smelting.
4. a kind of technology of utilizing dephosphorization station carry out molten iron demanganize according to claim 3 is characterized in that according to hot metal composition by computer calculates demanganize agent add-on, the demanganize reaction formula is following:
[Mn]+1/2(O2)=MnO
[Mn]+(FeO)+(SiO2)=MnO.SiO2+[Fe]
Calculate according to above reaction formula; With in the molten iron [Mn " take off to 0.06% from 0.30%, press the utilising efficiency 0.25 of oxygen among the FeO and calculate, molten iron per ton need add demanganize agent 12.6kg; desiliconization consumes red stone: calculate by sloughing 0.2%Si, need to consume 9.5kg/t demanganize agent.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104451007A (en) * | 2014-12-03 | 2015-03-25 | 北京首钢股份有限公司 | Method for removing manganese from molten iron of blast furnace |
| CN108929933A (en) * | 2018-09-21 | 2018-12-04 | 上海电气上重铸锻有限公司 | A kind of smelting process of low manganese Low-phosphorus Steel |
| CN110551865A (en) * | 2019-09-17 | 2019-12-10 | 天津达亿冶金技术研究有限公司 | system and process for treating molten iron of manganese-rich slag furnace by utilizing induction heating and blowing |
| CN115247222A (en) * | 2021-04-28 | 2022-10-28 | 河北龙凤山铸业有限公司 | Control method for preparing 4N-grade high-purity iron and ultralow manganese through pyrogenic process purification |
| CN115369205A (en) * | 2022-08-30 | 2022-11-22 | 鞍钢股份有限公司 | Low manganese steel converter blowing method |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104451007A (en) * | 2014-12-03 | 2015-03-25 | 北京首钢股份有限公司 | Method for removing manganese from molten iron of blast furnace |
| CN108929933A (en) * | 2018-09-21 | 2018-12-04 | 上海电气上重铸锻有限公司 | A kind of smelting process of low manganese Low-phosphorus Steel |
| CN110551865A (en) * | 2019-09-17 | 2019-12-10 | 天津达亿冶金技术研究有限公司 | system and process for treating molten iron of manganese-rich slag furnace by utilizing induction heating and blowing |
| CN115247222A (en) * | 2021-04-28 | 2022-10-28 | 河北龙凤山铸业有限公司 | Control method for preparing 4N-grade high-purity iron and ultralow manganese through pyrogenic process purification |
| CN115247222B (en) * | 2021-04-28 | 2023-11-24 | 河北龙凤山铸业有限公司 | Control method for preparing 4N-grade high-purity iron ultralow manganese through fire purification |
| CN115369205A (en) * | 2022-08-30 | 2022-11-22 | 鞍钢股份有限公司 | Low manganese steel converter blowing method |
| CN115369205B (en) * | 2022-08-30 | 2023-08-18 | 鞍钢股份有限公司 | Converting method of low manganese steel converter |
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Application publication date: 20120704 |