CN109750132A - A kind of bottom-blowing of converter mixes oxygen method - Google Patents
A kind of bottom-blowing of converter mixes oxygen method Download PDFInfo
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- CN109750132A CN109750132A CN201910095640.8A CN201910095640A CN109750132A CN 109750132 A CN109750132 A CN 109750132A CN 201910095640 A CN201910095640 A CN 201910095640A CN 109750132 A CN109750132 A CN 109750132A
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- nitrogen
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 143
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 143
- 239000001301 oxygen Substances 0.000 title claims abstract description 143
- 238000007664 blowing Methods 0.000 title claims abstract description 121
- 238000000034 method Methods 0.000 title claims abstract description 39
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 139
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 111
- 229910052742 iron Inorganic materials 0.000 claims abstract description 63
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 55
- 239000007789 gas Substances 0.000 claims abstract description 27
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 20
- 229910052698 phosphorus Inorganic materials 0.000 claims description 16
- 229910052710 silicon Inorganic materials 0.000 claims description 15
- 229910052717 sulfur Inorganic materials 0.000 claims description 15
- 238000003723 Smelting Methods 0.000 abstract description 42
- 229910000831 Steel Inorganic materials 0.000 abstract description 32
- 239000010959 steel Substances 0.000 abstract description 32
- 238000011010 flushing procedure Methods 0.000 abstract description 12
- 230000000694 effects Effects 0.000 abstract description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 5
- 230000008569 process Effects 0.000 abstract description 5
- 238000002156 mixing Methods 0.000 abstract description 4
- 230000008859 change Effects 0.000 abstract description 3
- 230000009467 reduction Effects 0.000 abstract description 2
- 238000000265 homogenisation Methods 0.000 abstract 1
- 239000004615 ingredient Substances 0.000 description 15
- 230000000052 comparative effect Effects 0.000 description 14
- 229910052748 manganese Inorganic materials 0.000 description 14
- 239000012535 impurity Substances 0.000 description 13
- 238000005070 sampling Methods 0.000 description 13
- 239000002994 raw material Substances 0.000 description 10
- 239000007788 liquid Substances 0.000 description 4
- 238000009628 steelmaking Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000005261 decarburization Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000036284 oxygen consumption Effects 0.000 description 3
- 230000004044 response Effects 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 241001417490 Sillaginidae Species 0.000 description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000004069 differentiation Effects 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000014075 nitrogen utilization Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention discloses a kind of bottom-blowing of converter to mix oxygen method, includes the following steps: molten iron being blended into top and bottom combined blown converter, then top oxygen gun oxygen blast, and furnace bottom oxygen blast gas or compressed air, nitrogen flushing are smelted, and top blast oxygen flow is 1.5~4.5m3/ (tmin), the flow of oxygen proportion is 0.001~0.3m in bottom blowing oxygen or compressed air3/ (tmin), bottom blowing nitrogen flow are 1.5~3.0m3/ (tmin), the present invention carry out bottom blowing by entering back into bottom-blowing of converter element after mixing oxygen or compressed air with nitrogen, do not change the existing bottom blowing element of converter；Simultaneously by adjusting the flow-rate ratio of oxygen and nitrogen in bottom blowing mixed gas, makes bath temperature homogenization, improves smelting dynamic conditions, improve blowing efficiency, make the reduction of molten steel endpoint carbon content, dephosphorization effect is higher, and the entire process flow of the present invention is simple, and smelting cost is low.
Description
Technical field
The present invention relates to converter steelmaking process technical fields more particularly to a kind of bottom-blowing of converter to mix oxygen method, by simultaneously
It is stirred to top and bottom combined blown converter bottom injecting oxygen, nitrogen, improves slag interface response intensity and decarburization, dephosphorization, desulfurization
Effect, while reducing clinker bubble level.
Background technique
Converter top bottom compositing blowing steelmaking technology is a kind of advanced process for making to grow up at the end of the seventies, the beginning of the eighties, this
Technique is installed bottom tuyere, is carried out bottom gas-feeding while top gun oxygen blast based on original oxygen top-blown converter
(N2、Ar、CO2、O2), this top bottom compositing blowing steelmaking technology can accelerate the reaction in converter between molten steel clinker gas to balance, and reach
Splash is reduced, recovery rate of iron is improved, reduces the purpose of endpoint molten steel oxygen content, uniform liquid steel temperature and ingredient.
For steelmaking process, nitrogen is most widely used bottom blown gas, however in converting process, pass through nitrogen bottom blowing
It is lower to will lead to top and bottom combined blown converter bottom temperature, provided shortage of heat leads to that molten steel temperature is lower, density is larger, smelting
It is poor to refine dynamic conditions, generally requires and increases Bottom Blowing Gas Flow Rate solution, thus furnace lining and bottom blowing element can be caused biggish
It influences.
In order to solve the above technical problems, the present invention, which provides a kind of bottom-blowing of converter, mixes oxygen method, by the way that oxygen or compression is empty
Gas enters back into bottom-blowing of converter element and carries out bottom blowing after mixing with nitrogen, carbon, which reacts, in oxygen and molten steel generates carbon monoxide
And a large amount of heat is released, while carbon monoxide further functions as stirring action to molten steel, liquid steel temperature is homogenized, is improved
The dynamic conditions of smelting molten steel.
Summary of the invention
In response to the problems existing in the prior art, the purpose of the present invention is to provide a kind of bottom-blowing of converter to mix oxygen method, by same
When be stirred to top and bottom combined blown converter bottom injecting oxygen, nitrogen, improve slag interface response intensity and decarburization, dephosphorization, de-
Sulphur effect, while reducing clinker bubble level shortens duration of blast, improves blowing efficiency, thus save oxygen consumption and
Oxygen supply time, and the entire process flow of the present invention is simple, smelting cost is low.
To achieve the above object, the technical solution adopted by the present invention is that:
A kind of bottom-blowing of converter mixes oxygen method, includes the following steps: molten iron being blended into top and bottom combined blown converter, the top blast into molten iron
Oxygen, meanwhile, the mixed gas that bottom blowing is made of oxygen or compressed air and nitrogen into molten iron；Wherein, oxygen in mixed gas
Gas content is less than or equal to the 10% of mixed gas total flow.
Preferably, the top blast oxygen flow is 1.5~4.5m3In/(tmin), bottom blowing oxygen or bottom blowing compressed air
The flow of oxygen proportion is 0.001~0.3m3/ (tmin), bottom blowing nitrogen flow are 1.5~3.0m3/ (tmin), into
Row is smelted.
The present invention is by entering back into bottom-blowing of converter element after mixing oxygen or compressed air with nitrogen in branch pipeline
Bottom blowing is carried out, and by adjusting Bottom Blowing Gas Flow Rate, the flow proportional of optimization oxygen and nitrogen, oxygen utilization rate can be improved, adopt
After top bottom blowing technique of the present invention, molten steel composition and more uniform temperature can be made, blow more steady, improvement smelting power
Condition to make the reduction of molten steel endpoint carbon content, and keeps liquid steel dephosphorization effect higher；When being conducive to shorten oxygen supply and blowing
Between, to save oxygen consumption and improve blowing efficiency.
Preferably, the oxygen or compressed air branch pipe manifold pressure are higher than nitrogen branch pipe manifold pressure 0.05-
0.1Mpa, by entering back into bottom-blowing of converter after mixing oxygen or compressed air force feed with nitrogen to nitrogen pipeline in branch pipeline
Element.
Further, the nitrogen branch pipe manifold pressure is 0.5~1MPa.
Preferably, the mass percent of middle C, Si, Mn, P and S of the molten iron are respectively as follows: C 3.0-4.5%；Si
0.46-0.73%；Mn 0.58-0.84；P 0.09-0.12%；S 0.02-0.05%.
Preferably, the molten iron temperature is 1200-1350 DEG C.
Compared with prior art, the beneficial effects of the present invention are:
(1) present invention improves top and bottom combined blown converter steel smelting technique, by bottom blowing oxygen and nitrogen simultaneously, passes through
Bottom blown gas is much larger than top blast oxygen to the stirring action of molten steel, after top bottom blowing technique of the present invention, not only molten steel
Ingredient and more uniform temperature, blowing is more stable and molten steel endpoint carbon content reduces, and dephosphorization effect is higher.
(2) by adjusting furnace bottom mixed injection oxygen, nitrogen gas flow proportional, furnace bottom injecting oxygen not only can be with steel
The reaction of water carbon generates CO gas and further functions as stirring action to molten steel, while can release heat, improves liquid steel temperature
And the uniformity, and then promote metallurgical effect.
(3) by increasing furnace bottom blast pass amount, reach shortening duration of blast, realize that the quick decarburization of top and bottom combined blown converter is de-
Phosphorus improves blowing efficiency, to save oxygen consumption and oxygen supply time.
(4) present invention improves oxygen by adjusting the flow proportional of top gun gun bit, bottom rifle gas flow and oxygen and nitrogen
Utilization rate, entire process flow is simple, and smelting cost is low.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to embodiments, to the present invention
It is further elaborated；It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to
Limit the present invention；Unless stated otherwise, the present invention uses reagent, method and apparatus is the art conventional reagents, method
And equipment.
Embodiment 1
Requirement to the raw material and smelting furnace of smelting is as follows:
Using top and bottom complex blowing K-OBM-S converter, the volume of the furnace is 90t, top blowing oxygen maximum stream flow 200m3/min；Bottom blowing
Gas maximum stream flow 60m3/min。
A kind of bottom-blowing of converter of the present embodiment mixes oxygen method, includes the following steps:
Molten iron is blended into top and bottom combined blown converter, molten iron temperature is 1280 DEG C, to molten iron sampling analysis, in molten iron C, Si,
The mass percent of Mn, P and S are respectively as follows: C 4.0%；Si 0.60%；Mn 0.70%；P 0.1%；S 0.03%；Top oxygen
Rifle oxygen blast, furnace bottom oxygen blast, nitrogen flushing are smelted, and top blast oxygen flow is 2.0m3/ (tmin), bottom blowing oxygen flow are 0.15m3/
(tmin), bottom blowing nitrogen flow is 2.5m3/ (tmin), is smelted.
Wherein, the nitrogen branch pipe manifold pressure is 0.8MPa, oxygen manifold manifold pressure 0.9MPa.
The weight percent of smelting endpoint molten steel ingredient are as follows: C 0.20%；Si 0.71%；Mn 0.80；P 0.015%；S
0.006%, remaining is Fe and inevitable impurity.
Embodiment 2
Requirement to the raw material and smelting furnace of smelting is as follows:
Using top and bottom complex blowing K-OBM-S converter, the volume of the furnace is 90t, top blowing oxygen maximum stream flow 200m3/min；Bottom blowing
Gas maximum stream flow 60m3/min。
A kind of bottom-blowing of converter of the present embodiment mixes oxygen method, includes the following steps:
Molten iron is blended into top and bottom combined blown converter, molten iron temperature is 1200 DEG C, to molten iron sampling analysis, in molten iron C, Si,
The mass percent of Mn, P and S are respectively as follows: C 3.0%；Si 0.46%；Mn 0.58%；P 0.09%；S 0.02%；Top
Oxygen gun blowing, furnace bottom oxygen blast, nitrogen flushing are smelted, and top blast oxygen flow is 1.5m3/ (tmin), bottom blowing oxygen flow are 0.001m3/
(tmin), bottom blowing nitrogen flow is 3.0m3/ (tmin), is smelted.
Wherein, the nitrogen branch pipe manifold pressure is 0.5MPa, oxygen manifold manifold pressure 0.6MPa.
The weight percent of smelting endpoint molten steel ingredient are as follows: C 0.22%；Si 0.65%；Mn 0.65%；P
0.019%；S 0.008%, remaining is Fe and inevitable impurity.
Embodiment 3
Requirement to the raw material and smelting furnace of smelting is as follows:
Using top and bottom complex blowing K-OBM-S converter, the volume of the furnace is 90t, top blowing oxygen maximum stream flow 200m3/min；Bottom blowing
Gas maximum stream flow 60m3/min。
A kind of bottom-blowing of converter of the present embodiment mixes oxygen method, includes the following steps:
Molten iron is blended into top and bottom combined blown converter, molten iron temperature is 1350 DEG C, to molten iron sampling analysis, in molten iron C, Si,
The mass percent of Mn, P and S are respectively as follows: C 4.5%；Si 0.73%；Mn 0.84%；P 0.12%；S 0.05%；Top
Oxygen gun blowing, furnace bottom oxygen blast, nitrogen flushing are smelted, and top blast oxygen flow is 4.5m3/ (tmin), bottom blowing oxygen flow are 0.3m3/
(tmin), bottom blowing nitrogen flow is 1.5m3/ (tmin), is smelted.
Wherein, the nitrogen branch pipe manifold pressure is 1.0MPa, oxygen manifold manifold pressure 1.05MPa.
The weight percent of smelting endpoint molten steel ingredient are as follows: C 0.24%；Si 0.75%；Mn 0.85%；P
0.017%；S 0.009%, remaining is Fe and inevitable impurity.
Embodiment 4
A kind of bottom-blowing of converter of the present embodiment mixes oxygen method, includes the following steps:
Molten iron is blended into top and bottom combined blown converter, molten iron temperature is 1280 DEG C, to molten iron sampling analysis, in molten iron C, Si,
The mass percent of Mn, P and S are respectively as follows: C 4.0%；Si 0.60%；Mn 0.70%；P 0.1%；S 0.04%；Top oxygen
Rifle oxygen blast, furnace bottom blowing compressed air, nitrogen flushing are smelted, and top blast oxygen flow is 2.0m3/ (tmin), bottom blowing compressed air, compression
The flow of oxygen proportion is 0.15m in air3/ (tmin), bottom blowing nitrogen flow are 2.5m3/ (tmin) carries out smelting
Refining.
Wherein, the nitrogen branch pipe manifold pressure is 0.8MPa, compressed air branch pipe manifold pressure 0.9MPa.
The weight percent of smelting endpoint molten steel ingredient are as follows: C 0.25%；Si 0.69%；Mn 0.80%；P
0.018%；S 0.008%, remaining is Fe and inevitable impurity.
Embodiment 5
A kind of bottom-blowing of converter of the present embodiment mixes oxygen method, includes the following steps:
Molten iron is blended into top and bottom combined blown converter, molten iron temperature is 1200 DEG C, to molten iron sampling analysis, in molten iron C, Si,
The mass percent of Mn, P and S are respectively as follows: C 3.0%；Si 0.46%；Mn 0.58%；P 0.09%；S 0.02%；Top
Oxygen gun blowing, furnace bottom blowing compressed air, nitrogen flushing are smelted, and top blast oxygen flow is 1.5m3/ (tmin), bottom blowing compressed air, pressure
The flow of oxygen proportion is 0.25m in contracting air3/ (tmin), bottom blowing nitrogen flow are 3.0m3/ (tmin) is carried out
It smelts.
Wherein, the nitrogen branch pipe manifold pressure is 0.5MPa, compressed air branch pipe manifold pressure 0.6MPa.
The weight percent of smelting endpoint molten steel ingredient are as follows: C 0.27%；Si 0.70%；Mn 0.60%；P
0.019%；S 0.01%, remaining is Fe and inevitable impurity.
Embodiment 6
A kind of bottom-blowing of converter of the present embodiment mixes oxygen method, includes the following steps:
Molten iron is blended into top and bottom combined blown converter, molten iron temperature is 1200 DEG C, to molten iron sampling analysis, in molten iron C, Si,
The mass percent of Mn, P and S are respectively as follows: C 4.5%；Si 0.73%；Mn 0.84%；P 0.12%；S 0.05%；Top
Oxygen gun blowing, furnace bottom blowing compressed air, nitrogen flushing are smelted, and top blast oxygen flow is 4.5m3/ (tmin), bottom blowing compressed air, pressure
The flow of oxygen proportion is 0.01m in contracting air3/ (tmin), bottom blowing nitrogen flow are 1.5m3/ (tmin) is carried out
It smelts.
Wherein, the nitrogen branch pipe manifold pressure is 1.0MPa, compressed air branch pipe manifold pressure 1.05MPa.
The weight percent of smelting endpoint molten steel ingredient are as follows: C 0.35%；Si 0.74%；Mn 0.84%；P 0.02%；
S 0.016%, remaining is Fe and inevitable impurity.
Comparative example 1
Requirement to the raw material and smelting furnace of smelting is as follows:
Using top and bottom complex blowing K-OBM-S converter, the volume of the furnace is 90t, top blowing oxygen maximum stream flow 200m3/min；Bottom blowing
Gas maximum stream flow 60m3/min。
This comparative example provides a kind of bottom-blowing of converter and mixes oxygen method, includes the following steps:
Molten iron is blended into top and bottom combined blown converter, molten iron temperature is 1280 DEG C, to molten iron sampling analysis, in molten iron C, Si,
The mass percent of Mn, P and S are respectively as follows: C 4.0%；Si 0.60%；Mn 0.70%；P 0.1%；S 0.03%；Top oxygen
Rifle oxygen blast, furnace bottom nitrogen flushing are smelted, and top blast oxygen flow is 2.15m3/ (tmin), bottom blowing nitrogen flow are 2.5m3/(t·
Min), smelted.
Wherein, the nitrogen branch pipe manifold pressure is 0.8MPa, oxygen manifold manifold pressure 0.9MPa.
The weight percent of smelting endpoint molten steel ingredient are as follows: C 1.5%；Si 0.61%；Mn 0.71%；P 0.08%；S
0.029%, remaining is Fe and inevitable impurity.
Comparative example 2
Requirement to the raw material and smelting furnace of smelting is as follows:
Using top and bottom complex blowing K-OBM-S converter, the volume of the furnace is 90t, top blowing oxygen maximum stream flow 200m3/min；Bottom blowing
Gas maximum stream flow 60m3/min。
This comparative example provides a kind of bottom-blowing of converter and mixes oxygen method, includes the following steps:
Molten iron is blended into top and bottom combined blown converter, molten iron temperature is 1280 DEG C, to molten iron sampling analysis, in molten iron C, Si,
The mass percent of Mn, P and S are respectively as follows: C 4.0%；Si 0.60%；Mn 0.70%；P 0.1%；S 0.03%；Top oxygen
Rifle oxygen blast, furnace bottom oxygen blast are smelted, and top blast oxygen flow is 2.0m3/ (tmin), bottom blowing oxygen flow are 2.65m3/(t·
Min), smelted.
Wherein, the oxygen manifold manifold pressure 1.0MPa, oxygen manifold manifold pressure 1.05MPa.
The weight percent of smelting endpoint molten steel ingredient are as follows: C 1.2%；Si 0.62%；Mn 0.71%；P 0.091%；
S 0.031%, remaining is Fe and inevitable impurity.
Comparative example 3
Requirement to the raw material and smelting furnace of smelting is as follows:
Using top and bottom complex blowing K-OBM-S converter, the volume of the furnace is 90t, top blowing oxygen maximum stream flow 200m3/min；Bottom blowing
Gas maximum stream flow 60m3/min。
This comparative example provides a kind of bottom-blowing of converter and mixes oxygen method, includes the following steps:
Molten iron is blended into top and bottom combined blown converter, molten iron temperature is 1280 DEG C, to molten iron sampling analysis, in molten iron C, Si,
The mass percent of Mn, P and S are respectively as follows: C 4.0%；Si 0.60%；Mn 0.70%；P 0.1%；S 0.03%；Top oxygen
Rifle oxygen blast, furnace bottom oxygen blast, nitrogen flushing are smelted, and top blast oxygen flow is 2.0m3/ (tmin), bottom blowing oxygen flow are 0.15m3/
(tmin), bottom blowing nitrogen flow is 2.5m3/ (tmin), is smelted.
Wherein, the nitrogen branch pipe manifold pressure is 0.8MPa, oxygen manifold manifold pressure 0.6MPa.
The weight percent of smelting endpoint molten steel ingredient are as follows: C 0.80%；Si 0.65%；Mn 0.72%；P 0.07%；
S 0.02%, remaining is Fe and inevitable impurity.
Comparative example 4
Requirement to the raw material and smelting furnace of smelting is as follows:
Using top and bottom complex blowing K-OBM-S converter, the volume of the furnace is 90t, top blowing oxygen maximum stream flow 200m3/min；Bottom blowing
Gas maximum stream flow 60m3/min。
This comparative example provides a kind of bottom-blowing of converter and mixes oxygen method, includes the following steps:
Molten iron is blended into top and bottom combined blown converter, molten iron temperature is 1100 DEG C, to molten iron sampling analysis, in molten iron C, Si,
The mass percent of Mn, P and S are respectively as follows: C 4.0%；Si 0.60%；Mn 0.70%；P 0.1%；S 0.03%；Top oxygen
Rifle oxygen blast, furnace bottom oxygen blast, nitrogen flushing are smelted, and top blast oxygen flow is 2.0m3/ (tmin), bottom blowing oxygen flow are 0.18m3/
(tmin), bottom blowing nitrogen flow is 2.5m3/ (tmin), is smelted.
Wherein, the nitrogen branch pipe manifold pressure is 0.8MPa, oxygen manifold manifold pressure 1.0MPa.
The weight percent of smelting endpoint molten steel ingredient are as follows: C 1.0%；Si 0.61%；Mn 0.71%；P 0.069%；
S 0.024%, remaining is Fe and inevitable impurity.
Comparative example 5
Requirement to the raw material and smelting furnace of smelting is as follows:
Using top and bottom complex blowing K-OBM-S converter, the volume of the furnace is 90t, top blowing oxygen maximum stream flow 200m3/min；Bottom blowing
Gas maximum stream flow 60m3/min。
This comparative example provides a kind of bottom-blowing of converter and mixes oxygen method, includes the following steps:
Molten iron is blended into top and bottom combined blown converter, molten iron temperature is 1280 DEG C, to molten iron sampling analysis, in molten iron C, Si,
The mass percent of Mn, P and S are respectively as follows: C4.0%；Si 0.60%；Mn 0.70%；P 0.1%；S 0.03%；Top oxygen
Rifle oxygen blast, furnace bottom oxygen blast, nitrogen flushing are smelted, and top blast oxygen flow is 1.2m3/ (tmin), bottom blowing oxygen flow are 0.3m3/(t·
Min), bottom blowing nitrogen flow is 3.15m3/ (tmin), is smelted.
Wherein, the nitrogen branch pipe manifold pressure is 0.8MPa, oxygen manifold manifold pressure 0.9MPa.
The weight percent of smelting endpoint molten steel ingredient are as follows: C 0.75%；Si 0.62%；Mn 0.74%；P 0.06%；
S 0.027%, remaining is Fe and inevitable impurity.
Comparative example 6
Requirement to the raw material and smelting furnace of smelting is as follows:
Using top and bottom complex blowing K-OBM-S converter, the volume of the furnace is 90t, top blowing oxygen maximum stream flow 200m3/min；Bottom blowing
Gas maximum stream flow 60m3/min。
This comparative example provides a kind of bottom-blowing of converter and mixes oxygen method, includes the following steps:
Molten iron is blended into top and bottom combined blown converter, molten iron temperature is 1280 DEG C, to molten iron sampling analysis, in molten iron C, Si,
The mass percent of Mn, P and S are respectively as follows: C4.0%；Si 0.60%；Mn 0.70%；P 0.1%；S 0.03%；Top oxygen
Rifle oxygen blast, furnace bottom oxygen blast, nitrogen flushing are smelted, and top blast oxygen flow is 3.0m3/ (tmin), bottom blowing oxygen flow are 0.3m3/(t·
Min), bottom blowing nitrogen flow is 1.35m3/ (tmin), is smelted.
Wherein, the nitrogen branch pipe manifold pressure is 0.8MPa, oxygen manifold manifold pressure 1.0MPa.
The weight percent of smelting endpoint molten steel ingredient are as follows: C 0.81%；Si 0.61%；Mn 0.70%；P
0.078%；S 0.030%, remaining is Fe and inevitable impurity.
Comparative example 7
Requirement to the raw material and smelting furnace of smelting is as follows:
Using top and bottom complex blowing K-OBM-S converter, the volume of the furnace is 90t, top blowing oxygen maximum stream flow 200m3/min；Bottom blowing
Gas maximum stream flow 60m3/min。
This comparative example provides a kind of bottom-blowing of converter and mixes oxygen method, includes the following steps:
Molten iron is blended into top and bottom combined blown converter, molten iron temperature is 1280 DEG C, to molten iron sampling analysis, in molten iron C, Si,
The mass percent of Mn, P and S are respectively as follows: C 4.0%；Si 0.60%；Mn 0.70%；P 0.1%；S 0.03%；Top oxygen
Rifle oxygen blast, furnace bottom blowing compressed air, top blast oxygen flow are 2.0m3/ (tmin), oxygen proportion in bottom blowing compressed air
Flow be 2.65m3/ (tmin), is smelted.
Wherein, the compressed air branch pipe manifold pressure 1.0MPa, oxygen manifold manifold pressure 1.05MPa.
The weight percent of smelting endpoint molten steel ingredient are as follows: C 1.5%；Si 0.61%；Mn 0.71%；P 0.069%；
S 0.026%, remaining is Fe and inevitable impurity.
The above, only of the invention illustrates embodiment, not to the present invention in any form with substantial limitation,
It should be pointed out that for those skilled in the art, under the premise of not departing from the method for the present invention, that makes several changes
It also should be regarded as protection scope of the present invention into supplement；All those skilled in the art, do not depart from spirit of that invention and
In the case where range, using the equivalent variations of a little change, modification and differentiation that disclosed above technology contents are made, it is
Equivalent embodiment of the invention；Meanwhile any equivalent variations that all substantial technologicals according to the present invention do above-described embodiment
Change, modification and differentiation, still fall within protection scope of the present invention.
Claims (6)
1. a kind of bottom-blowing of converter mixes oxygen method, which comprises the steps of: molten iron is blended into top and bottom combined blown converter, to
Top blast oxygen in molten iron, meanwhile, the mixed gas that bottom blowing is made of oxygen or compressed air and nitrogen into molten iron；Wherein, it mixes
It closes oxygen content in gas and is less than or equal to the 10% of mixed gas total flow.
2. a kind of bottom-blowing of converter according to claim 1 mixes oxygen method, which is characterized in that the top blast oxygen flow is
1.5~4.5m3The flow of oxygen proportion is 0.001~0.3m in/(tmin), bottom blowing oxygen or bottom blowing compressed air3/
(tmin), bottom blowing nitrogen flow is 1.5~3.0m3/ (tmin), is smelted.
3. a kind of bottom-blowing of converter according to claim 1 mixes oxygen method, which is characterized in that the oxygen or compressed air branch
Pressure is higher than nitrogen branch pipe manifold pressure 0.05-0.1Mpa in pipeline.
4. a kind of bottom-blowing of converter according to claim 3 mixes oxygen method, which is characterized in that the nitrogen branch pipeline internal pressure
Power is 0.5~1MPa.
5. a kind of bottom-blowing of converter according to claim 1 mixes oxygen method, which is characterized in that middle C, Si of the molten iron, Mn,
The mass percent of P and S is respectively as follows: C 3.0-4.5%；Si 0.46-0.73%；Mn 0.58-0.84；P 0.09-0.12%；
S 0.02-0.05%.
6. a kind of bottom-blowing of converter according to claim 1 mixes oxygen method, which is characterized in that the molten iron temperature is 1200-
1350℃。
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| CN102485918A (en) * | 2010-12-04 | 2012-06-06 | 山西太钢不锈钢股份有限公司 | Method for smelting stainless steel by top and bottom combined blown converter |
| CN103361464A (en) * | 2012-03-29 | 2013-10-23 | 山西太钢不锈钢股份有限公司 | Method for blowing oxygen at converter bottom |
| CN103966391A (en) * | 2014-05-05 | 2014-08-06 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for extracting vanadium through top-bottom combined blowing converter |
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| CN101139679A (en) * | 2007-10-17 | 2008-03-12 | 山西太钢不锈钢股份有限公司 | Method for smelting stainless steel by top and bottom combined blown converter |
| CN102485918A (en) * | 2010-12-04 | 2012-06-06 | 山西太钢不锈钢股份有限公司 | Method for smelting stainless steel by top and bottom combined blown converter |
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Application publication date: 20190514 |