CN109913613A - The half steel of rapid slagging lacks slag dephosphorization smelting process - Google Patents
The half steel of rapid slagging lacks slag dephosphorization smelting process Download PDFInfo
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- CN109913613A CN109913613A CN201910258193.3A CN201910258193A CN109913613A CN 109913613 A CN109913613 A CN 109913613A CN 201910258193 A CN201910258193 A CN 201910258193A CN 109913613 A CN109913613 A CN 109913613A
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Abstract
The invention discloses a kind of half steels of rapid slagging to lack slag dephosphorization smelting process, belong to iron and steel smelting technology field, the following steps are included: (1) is in converter, there are under conditions of clinker, it is 2-2.5 that composite fluxing medium working the slag basicity is added after slag splashing, it is blended into half steel, is then supplied oxygen in top blast, carries out blowing slag making under conditions of bottom blowing gas, it is 1.5-2, the slagging of falling furnace after finishing blowing that composite fluxing medium control basicity of slag is added during blowing；(2) it after step (1) slagging, is supplied oxygen in top blast, the basicity that dolomitic lime and active lime control terminal clinker is added under conditions of bottom blowing gas into converter is 3-4, it blows to obtaining qualified molten steel, tapping, stays slag entirely, obtains being present in the clinker B in converter；(3) circulation carries out step (1)-(2), wherein clinker existing for initial converter is the clinker B that step (2) obtain in step (1).
Description
Technical field
The invention belongs to iron and steel smelting technology fields, and in particular to a kind of half steel of rapid slagging lacks slag dephosphorization smelting side
Method.
Background technique
China possesses v-ti magnetite ore resources abundant, the country climb steel, hold steel, elder brother's steel, Wei Gangdeng iron and steel enterprise all adopt
It is smelted with vanadium titano-magnetite, pneumatic steelmaking main material is using the half steel after dedicated vanadium extraction by converter blowing, vanadium-bearing hot metal warp
Carbon mass percentage is 3.4%-4.0% in the half steel obtained after desulfurization vanadium extraction, silicon, manganese fever slagging constituent content in half steel
It is trace, phosphorus mass percentage is 0.060%-0.080%, therefore semisteel smelting has acid slagging object in converting process
The features such as matter is few, slag system constituent element is single and shortage of heat.It is therefore, long the time required to forming initial stage slag under the conditions of semi-steel making,
Dephosphorization rate is low and supplementary product onsumption is larger.
In order to improve dephosphorization effect, the prior art generally uses double slag process, i.e. the dephosphorization phase quickly improves slag using high rifle position
Middle FeO promotes slugging, the then secondary slag making smelting of the progress of falling slag.CN107034334A discloses the half of the quick slagging of falling furnace of one kind
The double slag melting methods of steel, comprising the following steps: a, after being blended into half steel is added dolomitic lime, active lime, top blast oxygen, simultaneously
Corundum slag and composite fluxing medium is added, adjusts initial stage basicity of slag and bleeds off the furnace of 70-90% when temperature reaches 1400-1500 DEG C
Slag；B, after step a slagging, dolomitic lime, active lime and composite fluxing medium is added, control finishing slag basicity is 3.5-4.5, is continued
Top blast oxygen opens addition ferrosilicon 1-2kg/t steel while blowing, until smelting endpoint, tapping, obtain clinker A.Above-mentioned patent in order to
Reach suitable basicity of slag, while joined composite fluxing medium, dolomitic lime and active lime, causes sludging time long (just
Phase slag forms time clinker after 2min or more, secondary slag making and forms the time in 1min or more), the big problem of supplementary product onsumption.
Summary of the invention
The technical problem to be solved in the present invention are as follows: when the existing smelting half steel using double slag process, sludging time is long, supplementary product onsumption
It is larger.
The technical solution of present invention solution above-mentioned technical problem are as follows: the half steel for providing a kind of rapid slagging lacks slag dephosphorization smelting
Smelting method, comprising the following steps:
It (1) is 2- there are composite fluxing medium working the slag basicity is added under conditions of clinker, after slag splashing in converter
2.5, it is blended into half steel, is then supplied oxygen in top blast, carries out blowing slag making under conditions of bottom blowing gas, is added during blowing multiple
Closing slag former control basicity of slag is 1.5-2, the slagging of falling furnace after finishing blowing；
(2) it after step (1) slagging, is supplied oxygen in top blast, dolomitic lime and work is added under conditions of bottom blowing gas into converter
Property lime control terminal clinker basicity be 3-4, blow to qualified molten steel is obtained, tapping stays slag entirely, obtains being present in converter
In clinker B；
(3) circulation carries out step (1)-(2), wherein clinker existing for initial converter is that step (2) obtain in step (1)
Clinker B.
Wherein, the half steel of above-mentioned rapid slagging lacks slag dephosphorization smelting process, the composite fluxing medium, dolomitic lime and work
Total addition level 20~40kg/t steel of property lime.
Wherein, the half steel of above-mentioned rapid slagging lacks slag dephosphorization smelting process, in step (1), in the composite fluxing medium
SiO2Content >=40wt%；Described be blended into before half steel also needs that steel scrap is added.
Wherein, the half steel of above-mentioned rapid slagging lacks slag dephosphorization smelting process, in step (1), the condition of the top blast oxygen supply
Include: oxygen supply intensity be 2-2.5m3/ (t steel min), the rifle position of oxygen rifle are 1.2-1.5m.
Wherein, the half steel of above-mentioned rapid slagging lacks slag dephosphorization smelting process, in step (1), the time of the blowing are as follows: add
Enter the 1.5-2.5min that blows before composite fluxing medium, the 1-1.5min that blows is added after composite fluxing medium.
Wherein, the half steel of above-mentioned rapid slagging lacks slag dephosphorization smelting process, in step (1), bottom blowing gas flow when blowing
For 1200-1600NL/min；Bottom blowing gas flow is 500-600NL/min when slagging.
Wherein, the half steel of above-mentioned rapid slagging lacks slag dephosphorization smelting process, in step (1), the temperature of molten steel when finishing blowing
Degree is 1300-1340 DEG C；The amount of the slagging is the 80-95wt% of clinker total amount.
Wherein, the half steel of above-mentioned rapid slagging lacks slag dephosphorization smelting process, in step (2), the condition of the top blast oxygen supply
Include: oxygen supply intensity be 3-4m3/ (t steel min), the rifle position of oxygen rifle are 1.3-2.2m.
Wherein, the half steel of above-mentioned rapid slagging lacks slag dephosphorization smelting process, and in step (2), the bottom blowing gas flow is
700-900NL/min。
Wherein, the half steel of above-mentioned rapid slagging lacks slag dephosphorization smelting process, and in step (2), the dolomitic lime contains for MgO
The lime of 30-40wt% is measured, additive amount is 11-15kg/t steel；The active lime is CaO content >=85wt% lime, is added
Dosage is 11-15kg/t steel.
Compared with prior art, the beneficial effects of the present invention are:
By being added separately to slag former, dolomitic lime and active lime, in conjunction with the adjusting of basicity twice before slagging, so that just
Sludging time after the formation time of phase slag and secondary slag making greatly shortens, and the formation time of initial stage slag only needs 0.3-0.4min,
The sludging time of secondary slag making is 0.5-0.6min；Auxiliary material (composite fluxing medium, dolomitic lime and work can also be greatly decreased simultaneously
Property lime) consumption, supplementary product onsumption is in 40kg/tSteelWithin；And the time of slagging is short, and slagging amount can reach 80% or more.
Specific embodiment
Specifically, a kind of half steel of rapid slagging lacks slag dephosphorization smelting process, comprising the following steps:
It (1) is 2- there are composite fluxing medium working the slag basicity is added under conditions of clinker, after slag splashing in converter
2.5, it is blended into half steel, is then supplied oxygen in top blast, carries out blowing slag making under conditions of bottom blowing gas, is added during blowing multiple
Closing slag former control basicity of slag is 1.5-2, the slagging of falling furnace after finishing blowing；
(2) it after step (1) slagging, is supplied oxygen in top blast, dolomitic lime and work is added under conditions of bottom blowing gas into converter
Property lime control terminal clinker basicity be 3-4, blow to qualified molten steel is obtained, tapping stays slag entirely, obtains being present in converter
In clinker B；
(3) circulation carries out step (1)-(2), wherein clinker existing for initial converter is that step (2) obtain in step (1)
Clinker B.
The clinker that step (1) of the present invention uses for the first time, which refers to, smelts the furnace obtained after half steel using the method for the prior art
Slag.
Qualified molten steel, which refers to, meets variety classes steel grade endpoint carbon content, temperature and the molten steel of phosphorus content requirement.
First composite fluxing medium adjustment basicity of slag 2-2.5 is added in method of the invention before being blended into half steel, is conducive to
Slag fluidity is improved, reduces the generation of high-melting-point substances, and keep steel slag in furnace sufficiently mixed using impact force when being blended into half steel
It is even, achieve the purpose that rapid slagging.Initial stage clinker is formed after being blended into half steel, is conducive to dephosphorization.Initial stage slag forms the time
Shorter, dephosphorization effect is better.It is to further improve clinker that composite fluxing medium was added again and reduces basicity to 1.5-2 the dephosphorization phase
Mobility shortens the time of falling slag, pours out richness phosphorus clinker early period more, for further dephosphorization provides safeguard after secondary slag making.
In the present invention, the active lime, dolomitic lime and composite fluxing medium be this field in steel-making commonly used by
Active lime, dolomitic lime and composite fluxing medium.The active lime mainly contains CaO, and with the gross weight of the active lime
On the basis of amount, the content of CaO is 85-90wt%.The dolomitic lime mainly contains MgO and CaO, with the total of the dolomitic lime
On the basis of weight, the content of MgO is 30-40wt%, and the content of CaO is 48-55wt%.The main component of the composite fluxing medium
It is SiO2, the composite fluxing medium can be SiO2Content is the acid steelmaking slagging material of 40-70wt%；Under preferable case, institute
State SiO in composite fluxing medium2Content be 40-60wt%, the oxide (Fe of iron2O3And FeO) content be 15-20wt%,
The content of CaO is 10-15wt%, and the content of MgO is 3-9wt%, remaining is a small amount of impurity.
In the present invention, steel scrap is added according to actual needs, and steel scrap is added before being blended into half steel to carry out using to steel scrap
Preheating improves in-furnace temperature utilization rate, can also reduce soot emissions when being blended into half steel.
In the present invention, early period, oxygen supply intensity was set as 2-2.5m3/ (t steel min) is to reduce to bath lancing
Amount reduces reaction between carbon and oxygen early period rate, reduces molten bath heating rate, and then extend the low temperature dephosphorization time, promotes dephosphorization early period.Afterwards
The oxygen supply of phase higher-strength is set as 3-4m3/ (t steel min) is the penetration depth and impact in order to guarantee oxygen rifle jet stream to molten bath
Face achievees the purpose that ingredient and temperature in uniform furnace, shortens the heat.
The gas source that bottom blowing of the present invention uses for nitrogen or argon gas, gas supply flow using early period high (1200-1600NL/min),
Slagging low (500-600NL/min), the purpose in later period slightly higher (700-900NL/min) are mainly: early period is supplied using high bottom blowing
Throughput increases the stirring to molten bath, promotes steel-slag interfacial reaction, and dephosphorisation reaction is steel-slag interfacial reaction, and then is improved de-
Phosphorus efficiency.It is that clinker springs up excessive in order to prevent that flow is reduced when slagging, and the when of falling slag seethes generation peril.And the later period uses
Suitable flow is that have good melting bath stirring effect while guaranteeing the service life of bottom-blown air brick under high temperature in order to realize.
In the present invention, the reason of low rifle position and fluctuation range small (1.2-1.5m) are used before slagging: first is that in order to increase
Melting bath stirring promotes dephosphorization；Second is that clinker excessively actively causes splash and difficult slagging in order to prevent.Rifle position fluctuation range after slagging
(1.3-2.2m) is primarily to flexibly control, guarantees that clinker is active, be conducive to dephosphorization greatly.
A specific embodiment of the invention is further described below with reference to embodiment, is not therefore limited the present invention
System is among the embodiment described range.
Embodiment 1
The 120t converter of certain factory uses semi-steel making, and entering furnace half steel phosphorus content is 0.080%, is carried out using method of the invention
It smelts, it is 2 that a upper furnace, which stays and composite fluxing medium control initial stage basicity of slag is only added after slag into converter, and then addition steel scrap 6t, is converted
Lower rifle starts to blow after entering half steel, and top blow oxygen lance oxygen supply intensity is 2m3/ (t steel min), blowing rifle position control is in 1.2m-
1.3m, bottom blowing flow are 1200NL/min；Blow 1.5min when composite fluxing medium be added again reduce basicity of slag to 1.5, after
The slagging of falling furnace when continuous oxygen blast is to 3min, phosphorus content 0.019% in the when of falling furnace molten steel, slagging amount is the 92wt% of clinker total amount, is put
Bottom blowing flow is 500NL/min when slag, and half steel temperature is 1300 DEG C when slagging.Secondary slag making is carried out after slagging, when secondary slag making
Dolomitic lime 11kg/t steel is only added and active lime 15kg/t steel controls finishing slag basicity 3, top blow oxygen lance supplies oxygen after secondary slag making
Intensity is 3m3/ (t steel min), the control of blowing rifle position is in 1.3m-1.9m, and bottom blowing flow is 700NL/min, until finishing blowing
Qualified molten steel, no longer slagging after finishing blowing are obtained, direct tapping stays slag to be used for next furnace initial stage dephosphorization entirely after tapping,
So circulation.
Few slag dephosphorization steel-making is carried out according to the present invention, the converter initial stage slag formation time is only 0.3min, the time of falling slag at initial stage
Only 3min；Secondary slag making sludging time is only 0.5min, ton steel auxiliary material (composite fluxing medium and dolomitic lime and active stone
It is grey) consumption is only 34kg, and final dephosphorization rate reaches 90%, and with rapid slagging, easily slag, supplementary product onsumption are low, and dephosphorization rate is high
The characteristics of.
Embodiment 2
The 120t converter of certain factory uses semi-steel making, and entering furnace half steel phosphorus content is 0.060%.It is carried out using method of the invention
It smelts, it is 2.3 that a upper furnace, which stays and composite fluxing medium control initial stage basicity of slag is only added after slag into converter, then addition steel scrap 7t,
Lower rifle starts to blow after being blended into half steel, and top blow oxygen lance oxygen supply intensity is 2.3m3/ (t steel min), blowing rifle position control is in 1.3m-
1.4m, bottom blowing flow are 1400NL/min；Composite fluxing medium is added when blowing 2min again reduces basicity of slag to 1.8, continues
The slagging of falling furnace when oxygen blast is to 3.2min, phosphorus content 0.018% in the when of falling furnace molten steel, slagging amount is the 85wt% of clinker total amount, is put
Bottom blowing flow is 550NL/min when slag, and half steel temperature is 1320 DEG C when slagging.Secondary slag making is carried out after slagging, when secondary slag making
Dolomitic lime 13kg/t steel is only added and active lime 13kg/t steel controls finishing slag basicity 3.5, top blow oxygen lance supplies after secondary slag making
Oxygen intensity is 3.5m3/ (t steel min), for the control of blowing rifle position in 1.6m-2.2m, bottom blowing flow is 800NL/min, until blowing
End obtains qualified molten steel, no longer slagging after finishing blowing, and direct tapping stays slag de- for next furnace initial stage entirely after tapping
Phosphorus so recycles.
Few slag dephosphorization steel-making is carried out according to the present invention, the converter initial stage slag formation time is only 0.34min, the time of falling slag at initial stage
Only 1.5min；Secondary slag making sludging time is only 0.6min, ton steel auxiliary material (composite fluxing medium and dolomitic lime and active stone
It is grey) consumption is only 32kg, and final dephosphorization rate reaches 88%, and with rapid slagging, easily slag, supplementary product onsumption are low, and dephosphorization rate is high
The characteristics of.
Embodiment 3
The 120t converter of certain factory uses semi-steel making, and entering furnace half steel phosphorus content is 0.075%.It is carried out using method of the invention
It smelts, it is 2.5 that a upper furnace, which stays and composite fluxing medium control initial stage basicity of slag is only added after slag into converter, then addition steel scrap 8t,
Lower rifle starts to blow after being blended into half steel, and top blow oxygen lance oxygen supply intensity is 2.5m3/ (t steel min), blowing rifle position control is in 1.4m-
1.5m, bottom blowing flow are 1600NL/min；Composite fluxing medium is added when blowing 2.5min again reduces basicity of slag to 2, continues
The slagging of falling furnace when oxygen blast is to 3.5min, phosphorus content 0.018% in the when of falling furnace molten steel, slagging amount is the 80wt% of clinker total amount, is put
Bottom blowing flow is 600NL/min when slag, and half steel temperature is 1340 DEG C when slagging.Secondary slag making is carried out after slagging, when secondary slag making
Dolomitic lime 15kg/t steel is only added and active lime 15kg/t steel controls finishing slag basicity 4, top blow oxygen lance supplies oxygen after secondary slag making
Intensity is 4m3/ (t steel min), the control of blowing rifle position is in 1.5m-1.8m, and bottom blowing flow is 900NL/min, until finishing blowing
Qualified molten steel, no longer slagging after finishing blowing are obtained, direct tapping stays slag to be used for next furnace initial stage dephosphorization entirely after tapping,
So circulation.
Few slag dephosphorization steel-making is carried out according to the present invention, the converter initial stage slag formation time is only 0.4min, the time of falling slag at initial stage
Only 2.5min；Secondary slag making sludging time is only 0.55min, ton steel auxiliary material (composite fluxing medium and dolomitic lime and activity
Lime) consumption is only 38kg, and final dephosphorization rate reaches 89%, there is rapid slagging, easily slag, supplementary product onsumption are low, dephosphorization rate
High feature.
Claims (10)
1. the half steel of rapid slagging lacks slag dephosphorization smelting process, which comprises the following steps:
(1) it is 2-2.5 there are composite fluxing medium working the slag basicity is added under conditions of clinker, after slag splashing in converter, converts
Enter half steel, is then supplied oxygen in top blast, carry out blowing slag making under conditions of bottom blowing gas, compound slag making is added during blowing
It is 1.5-2, the slagging of falling furnace after finishing blowing that agent, which controls basicity of slag,；
(2) it after step (1) slagging, is supplied oxygen in top blast, dolomitic lime and active stone is added under conditions of bottom blowing gas into converter
The basicity of ash control terminal clinker is 3-4, is blown to qualified molten steel is obtained, tapping stays slag entirely, obtains being present in converter
Clinker B；
(3) circulation carries out step (1)-(2), wherein clinker existing for initial converter is the furnace that step (2) obtain in step (1)
Slag B.
2. the half steel of rapid slagging lacks slag dephosphorization smelting process according to claim 1, which is characterized in that the compound slag making
The total addition level of agent, dolomitic lime and active lime is 20~40kg/t steel.
3. the half steel of rapid slagging lacks slag dephosphorization smelting process according to claim 1, which is characterized in that in step (1), institute
State SiO in composite fluxing medium2Content >=40wt%；Described be blended into before half steel also needs that steel scrap is added.
4. the half steel of rapid slagging lacks slag dephosphorization smelting process according to claim 1, which is characterized in that in step (1), institute
It is 2-2.5m that the condition for stating top blast oxygen supply, which includes: oxygen supply intensity,3/ (t steel min), the rifle position of oxygen rifle are 1.2-1.5m.
5. the half steel of rapid slagging lacks slag dephosphorization smelting process according to claim 1, which is characterized in that in step (1), institute
State the time of blowing are as follows: blow 1.5-2.5min before addition composite fluxing medium, and blow 1-1.5min after addition composite fluxing medium.
6. the half steel of rapid slagging lacks slag dephosphorization smelting process according to claim 1, which is characterized in that in step (1), blow
Bottom blowing gas flow is 1200-1600NL/min when refining；Bottom blowing gas flow is 500-600NL/min when slagging.
7. the semi-steel dephosphorizing smelting process of rapid slagging according to claim 1, which is characterized in that in step (1), blowing knot
The temperature of molten steel is 1300-1340 DEG C when beam；The amount of the slagging is the 80-95wt% of clinker total amount.
8. the half steel of rapid slagging lacks slag dephosphorization smelting process according to claim 1, which is characterized in that in step (2), institute
It is 3-4m that the condition for stating top blast oxygen supply, which includes: oxygen supply intensity,3/ (t steel min), the rifle position of oxygen rifle are 1.3-2.2m.
9. the semi-steel dephosphorizing smelting process of rapid slagging according to claim 1, which is characterized in that in step (2), the bottom
Blowing gas supply flow is 700-900NL/min.
10. the half steel of rapid slagging lacks slag dephosphorization smelting process according to claim 1, which is characterized in that in step (2),
The dolomitic lime is the lime of content of MgO 30-40wt%, and additive amount is 11-15kg/t steel；The active lime contains for CaO
Amount >=85wt% lime, additive amount are 11-15kg/t steel.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112795724A (en) * | 2020-12-28 | 2021-05-14 | 河钢股份有限公司承德分公司 | Method for accelerating slagging of converter smelting semisteel |
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| JP2005206900A (en) * | 2004-01-23 | 2005-08-04 | Kobe Steel Ltd | Converter operating method |
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| CN112795724A (en) * | 2020-12-28 | 2021-05-14 | 河钢股份有限公司承德分公司 | Method for accelerating slagging of converter smelting semisteel |
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