CN108977611A - A kind of converter hot metal containing low silicon converting method using cast steel recrement - Google Patents
A kind of converter hot metal containing low silicon converting method using cast steel recrement Download PDFInfo
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- CN108977611A CN108977611A CN201811010495.0A CN201811010495A CN108977611A CN 108977611 A CN108977611 A CN 108977611A CN 201811010495 A CN201811010495 A CN 201811010495A CN 108977611 A CN108977611 A CN 108977611A
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- recrement
- cast steel
- steel
- hot metal
- metal containing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/30—Regulating or controlling the blowing
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention discloses a kind of converter hot metal containing low silicon converting methods using cast steel recrement, by the way that cast steel recrement is added in converting process, to improve the slugging condition that blows, make the early slugging of converter energy in smelting low-silicon molten iron converting process, change slag and changed slag, dephosphorization efficiency significantly improves.Clinker, which covers molten steel face to advantageously reduce completely, returns the dry steel bonding problem with oxygen rifle, fire door, petticoat pipe caused by splash etc., reduces iron and steel stock loss, reduce a ton steel consumption, labor intensity is reduced, save the cost is conducive to and improves production security, there is good application value.
Description
Technical field
The invention belongs to bessemerize technical field, and in particular to a kind of converter hot metal containing low silicon blowing using cast steel recrement
Method.
Background technique
Very big economic benefit can be brought to iron and steel enterprise using hot metal containing low silicon in the production of modern age large blast furnace.Blast furnace iron
The siliceous every reduction by 0.1% of water, can be improved yield 1.0% ~ 1.5%.The U.S., Japan, European Countries large blast furnace the silicon of molten iron contain
Amount has all reduced.But it is compared with normal siliceous molten iron-steelmaking, in smelting process, decarburizing reaction shifts to an earlier date hot metal containing low silicon, the oxygen of carbon
Change the oxidation prior to silicon, SiO in clinker2It is difficult to be enriched with, the dicalcium silicate more early occurred in initial stage slag hinders lime again
Melt, keeps Primary period slag making difficult, dephosphorization effect is poor.Supplementing silicon source for converter is to solve to exist in hot metal containing low silicon converting process
Problems method the most direct, ferrosilicon, river sand, silica as supplement silicon source have certain industrial practice.But silicon
Iron itself is expensive, and river sand, silica content are complicated and the thawing time is long, all not as the ideal chose of supplement silicon source.
In actual operation, it when oxygen lance position is as low as certain degree, or uses a certain low rifle position to blow for a long time, melts
Decarbonization rate is fast in pond, and FeO consumption is more, and the content of TFe can be reduced, and cause slag to return dry, metal expulsion events are serious.Thus into
One step causes the major accidents such as steel adhesion on oxygen lance, not only increases processing cost, also affects going on smoothly for production.
When bessemerizing, due to heat affluence, it is excessively high to will lead to furnace temperature, and furnace lining is easy by impingment corrosion.And it is blowing
Dephosphorisation reaction is stronger to the sensibility of temperature during refining, and the distribution ratio decline of phosphorus, causes containing in molten steel under the high temperature conditions
Phosphorus amount is more difficult to drop to requirement or less.The gas being dissolved in molten steel increases, to influence the quality of steel.And due to molten steel of tapping
Temperature is excessively high, be easy to cause casting accident.
For this purpose, researching and developing a kind of converter hot metal containing low silicon converting method right and wrong using cast steel recrement for being able to solve the above problem
Chang Guanjian's.
Summary of the invention
The purpose of the present invention is to provide a kind of converter hot metal containing low silicon converting methods using cast steel recrement.
The object of the present invention is achieved like this, comprising the following steps:
1) steel scrap is first added in converter and is blended into molten iron again, oxygen lance position is set as 180 ~ 220cm, starts to light a fire；
2) start to blow after lighting a fire successfully, while cast steel recrement being added in converter by high hopper, and continue to blow to first
Slag is formed, and reduces oxygen lance position to 160 ~ 180cm, slag material is added；
3) after entering blowing final period, oxygen lance position is reduced to 100 ~ 120cm, reaches to molten steel composition and smelts steel grade requirement and temperature
Up to when smelting steel grade tapping temperature, stop oxygen blast, tapping immediately.
Compared with prior art, the invention has the following advantages:
1) SiO is added in converter steelmaking process in the present invention2The cast steel recrement of rich content, i.e., fundamentally solve converter
Low brought a series of problems of silicone content in smelting, while the cast steel recrement as industry byproduct being made to turn waste into wealth, not only
Resource has been vitalized, while having decreased the pollution of environment.
2) the cast steel recrement that the present invention is added during bessemerizing is advantageously reduced to return to do and be made with splash rich in TFe
At oxygen rifle, fire door, petticoat pipe etc. steel bonding problem, reduce iron and steel stock loss, reduce labor intensity, be conducive to save the cost and
Production security is improved, there is good application value.
3) steel scrap is added as coolant in the present invention before blowing, so that converter is reached thermal balance in converting process, reaches
To qualified temperature.The consumption of iron and steel stock, slag making materials and oxygen, and the iron ore than using in common process can be reduced
Cooling effect stability, splash is few, and dephosphorization effect is good.
4) the cast steel recrement that the present invention is added during bessemerizing contains a large amount of Al2O3, MnO and CaO, can replace
Generation a part slag material so that in smelting process slag material slump in demand, while save the cost, but also more than cast steel
Slag maximum resource utilization.
Specific embodiment
Below with reference to embodiment, the present invention is further illustrated, but the present invention is limited in any way,
Based on present invention teach that it is made it is any transform or replace, all belong to the scope of protection of the present invention.
Converter hot metal containing low silicon converting method of the present invention using cast steel recrement the following steps are included:
1) steel scrap is first added in converter and is blended into molten iron again, oxygen lance position is set as 180 ~ 220cm, starts to light a fire；
2) start to blow after lighting a fire successfully, while cast steel recrement being added in converter by high hopper, and continue to blow to first
Slag is formed, and reduces oxygen lance position to 160 ~ 180cm, slag material is added；
3) after entering blowing final period, oxygen lance position is reduced to 100 ~ 120cm, reaches to molten steel composition and smelts steel grade requirement and temperature
Up to when smelting steel grade tapping temperature, stop oxygen blast, tapping immediately.
The silicone content of molten iron described in step 1) is lower than 0.15%.
Cast steel recrement described in step 2 is added in 5min after starting blowing and is finished.
Cast steel recrement described in step 2 includes the ingredient of following weight ratio: SiO223%-30%, TFe 20~25%、
Al2O312%-14%、MnO18% –21%、CaO15~20%。
The adding manner of slag material described in step 2 is that point 8 ~ 12 batches are added, and the weight that every batch of is added is molten iron
0.1%~0.4%。
Slag material described in step 2 includes the ingredient of following weight ratio: lime 50 ~ 60%, light dolomite 30 ~ 40%, water chestnut
Magnesium ball 5 ~ 10%.
The oxygen supply constant pressure of the oxygen rifle is 0.78 ~ 0.82MPa.
The flow of the oxygen rifle is 22800 ~ 24000m3/h。
The weight of steel scrap described in step 1) is the 4% ~ 14% of molten iron.
The weight of cast steel recrement described in step 2 is the 0.75 ~ 1% of molten iron.
Embodiment 1
1) steel scrap is first added in converter and is blended into molten iron again, oxygen lance position is set as 180cm, starts to light a fire；The silicon of the molten iron
Content is 0.05%；The weight of the steel scrap is the 4% of molten iron；The oxygen supply constant pressure of the oxygen rifle is 0.78Mpa；The oxygen
The flow of rifle is 22800m3/h；
2) start to blow after lighting a fire successfully, while cast steel recrement being added in converter by high hopper, and continue to blow to first
Slag is formed, and reduces oxygen lance position to 160cm, slag material is added；The cast steel recrement has added in 5min after starting blowing
Finish.The cast steel recrement includes the ingredient of following weight ratio: SiO228%, TFe 22%, Al2O313%, MnO18%, CaO19%.
The adding manner of the slag material is that point 8 batches are added, and the weight that every batch of is added is the 0.1% of molten iron.The slag material
Ingredient including following weight ratio: lime 50%, light dolomite 40%, magnesite ball 10%.The weight of the cast steel recrement is iron
The 0.75% of water.
3) after entering blowing final period, oxygen lance position is reduced to 100cm, reaches to molten steel composition and smelts steel grade requirement and temperature
Up to when smelting steel grade tapping temperature, stop oxygen blast, tapping immediately.
Embodiment 2
1) steel scrap is first added in converter and is blended into molten iron again, oxygen lance position is set as 190cm, starts to light a fire；The silicon of the molten iron
Content is 0.08%；The weight of the steel scrap is the 8% of molten iron；The oxygen supply constant pressure of the oxygen rifle is 0.79MPa；The oxygen
The flow of rifle is 23000m3/h；
2) start to blow after lighting a fire successfully, while cast steel recrement being added in converter by high hopper, and continue to blow to first
Slag is formed, and reduces oxygen lance position to 170cm, slag material is added；The cast steel recrement has added in 5min after starting blowing
Finish.The cast steel recrement includes the ingredient of following weight ratio: SiO230%, TFe 25%, Al2O312%, MnO18%,
CaO15%.The adding manner of the slag material is that point 9 batches are added, and the weight that every batch of is added is the 0.2% of molten iron.It is described
Slag material include following weight ratio ingredient: lime 55%, light dolomite 38%, magnesite ball 7%.The cast steel recrement
Weight is the 0.85% of molten iron.
3) after entering blowing final period, oxygen lance position is reduced to 105cm, reaches to molten steel composition and smelts steel grade requirement and temperature
Up to when smelting steel grade tapping temperature, stop oxygen blast, tapping immediately.
Embodiment 3
1) steel scrap is first added in converter and is blended into molten iron again, oxygen lance position is set as 200cm, starts to light a fire；The silicon of the molten iron
Content is 0.1%；The weight of the steel scrap is the 10% of molten iron；The oxygen supply constant pressure of the oxygen rifle is 0.81MPa；The oxygen
The flow of rifle is 23500m3/h；
2) start to blow after lighting a fire successfully, while cast steel recrement being added in converter by high hopper, and continue to blow to first
Slag is formed, and reduces oxygen lance position to 175cm, slag material is added；The cast steel recrement has added in 5min after starting blowing
Finish.The cast steel recrement includes the ingredient of following weight ratio: SiO223%, TFe 22%, Al2O314%, MnO21%, CaO20%.
The adding manner of the slag material is that point 10 batches are added, and the weight that every batch of is added is the 0.3% of molten iron.The slag making
Material includes the ingredient of following weight ratio: lime 58%, light dolomite 37%, magnesite ball 5%.The weight of the cast steel recrement is
The 0.9% of molten iron.
3) after entering blowing final period, oxygen lance position is reduced to 110cm, reaches to molten steel composition and smelts steel grade requirement and temperature
Up to when smelting steel grade tapping temperature, stop oxygen blast, tapping immediately.
Embodiment 4
1) steel scrap is first added in converter and is blended into molten iron again, oxygen lance position is set as 220cm, starts to light a fire；The silicon of the molten iron
Content is 0.15%；The weight of the steel scrap is the 14% of molten iron；The oxygen supply constant pressure of the oxygen rifle is 0.82MPa；Described
The flow of oxygen rifle is 24000m3/h；
2) start to blow after lighting a fire successfully, while cast steel recrement being added in converter by high hopper, and continue to blow to first
Slag is formed, and reduces oxygen lance position to 180cm, slag material is added；The cast steel recrement has added in 5min after starting blowing
Finish.The cast steel recrement includes the ingredient of following weight ratio: SiO226%, TFe 24%, Al2O314%, MnO18%, CaO18%.
The adding manner of the slag material is that point 12 batches are added, and the weight that every batch of is added is the 0.4% of molten iron.The slag making
Material includes the ingredient of following weight ratio: lime 60%, light dolomite 30%, magnesite ball 10%.The weight of the cast steel recrement is
The 1% of molten iron.
3) after entering blowing final period, oxygen lance position is reduced to 120cm, reaches to molten steel composition and smelts steel grade requirement and temperature
Up to when smelting steel grade tapping temperature, stop oxygen blast, tapping immediately.
Test example 1
E furnace uses traditional handicraft in following tests example, and F furnace uses the converting method of embodiment 3.
In April, 2017, the new district E furnace furnace crown of falling top of the slag fettling 4 times are tapped face furnace crown fettling 3 times, each fettling sand dosage
2 tons, totally 14 tons；The F furnace furnace crown of falling top of the slag fettling 2 times is tapped face furnace crown fettling 1 time, each 2 tons of fettling sand dosage, 6 tons totally;4
Month F furnace ratio E furnace uses 8 tons of fettling sand less.It is calculated by 2300 yuan of ∕ tons of fettling sand, F furnace year-on-year E furnace in April saves 18400 yuan.
Test example 2
In April, 2017, new district E furnace steel output are 8.6 ten thousand tons, and steel technology is 1076kg ∕ tons of steel；F furnace steel output is 9
Ten thousand tons, steel technology is 1072kg ∕ tons of steel.It is calculated by the processing cost that the every drop 1kg iron and steel stock of ton steel saves 2 yuan, F furnace 4
The moon, E furnace saved 720,000 yuan on year-on-year basis.
Test example 3
In April, 2017, new district E furnace weight rifle consume 20, and F furnace weight rifle consumes 12, and F furnace year-on-year E furnace weight rifle in April is few
8.
Claims (10)
1. a kind of converter hot metal containing low silicon converting method using cast steel recrement, it is characterised in that the following steps are included:
1) steel scrap is first added in converter and is blended into molten iron again, oxygen lance position is set as 180 ~ 220cm, starts to light a fire；
2) start to blow after lighting a fire successfully, while cast steel recrement being added in converter by high hopper, and continue to blow to first
Slag is formed, and reduces oxygen lance position to 160 ~ 180cm, slag material is added；
3) after entering blowing final period, oxygen lance position is reduced to 100 ~ 120cm, reaches to molten steel composition and smelts steel grade requirement and temperature
Up to when smelting steel grade tapping temperature, stop oxygen blast, tapping immediately.
2. the converter hot metal containing low silicon converting method according to claim 1 using cast steel recrement, it is characterised in that step 1)
The silicone content of the molten iron is lower than 0.15%.
3. the converter hot metal containing low silicon converting method according to claim 1 using cast steel recrement, it is characterised in that step 2
The cast steel recrement is added in 5min after starting blowing and is finished.
4. the converter hot metal containing low silicon converting method according to claim 1 using cast steel recrement, it is characterised in that step 2
The cast steel recrement includes the ingredient of following weight ratio: SiO223%-30%、TFe 20~25%、Al2O312%-14%、MnO18%
–21%、CaO15~20%。
5. the converter hot metal containing low silicon converting method according to claim 1 using cast steel recrement, it is characterised in that step 2
The adding manner of the slag material is that point 8 ~ 12 batches are added, and the weight that every batch of is added is the 0.1% ~ 0.4% of molten iron.
6. the converter hot metal containing low silicon converting method according to claim 1 using cast steel recrement, it is characterised in that step 2
The slag material includes the ingredient of following weight ratio: lime 50 ~ 60%, light dolomite 30 ~ 40%, magnesite ball 5 ~ 10%.
7. the converter hot metal containing low silicon converting method according to claim 1 using cast steel recrement, it is characterised in that described
The oxygen supply constant pressure of oxygen rifle is 0.78 ~ 0.82MPa.
8. the converter hot metal containing low silicon converting method according to claim 1 using cast steel recrement, it is characterised in that described
The flow of oxygen rifle is 22800 ~ 24000m3/h。
9. the converter hot metal containing low silicon converting method according to claim 1 using cast steel recrement, it is characterised in that step 1)
The weight of the steel scrap is the 4% ~ 14% of molten iron.
10. the converter hot metal containing low silicon converting method according to claim 1 using cast steel recrement, it is characterised in that step 2
The weight of the cast steel recrement is the 0.75 ~ 1% of molten iron.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811010495.0A CN108977611B (en) | 2018-08-31 | 2018-08-31 | Converter low-silicon molten iron blowing method using cast steel residues |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811010495.0A CN108977611B (en) | 2018-08-31 | 2018-08-31 | Converter low-silicon molten iron blowing method using cast steel residues |
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| CN108977611B CN108977611B (en) | 2020-04-28 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101117651A (en) * | 2006-07-31 | 2008-02-06 | 宝山钢铁股份有限公司 | Converting process for converter low-silicon molten iron |
| CN102994689A (en) * | 2012-11-30 | 2013-03-27 | 武钢集团昆明钢铁股份有限公司 | Method for heat application of low-alkalinity casting residue in steel-making |
| CN103555878A (en) * | 2013-11-25 | 2014-02-05 | 武钢集团昆明钢铁股份有限公司 | Safe and high-efficient low-silicon molten-ion blowing process |
| CN103710484A (en) * | 2014-01-06 | 2014-04-09 | 鞍钢股份有限公司 | Silicon recycling method for controlling casting residue to be recycled to low-silicon steel |
| CN104711388A (en) * | 2015-02-04 | 2015-06-17 | 北京科技大学 | Low-silicon molten iron blowing method |
| CN105219913A (en) * | 2015-11-10 | 2016-01-06 | 湖南华菱湘潭钢铁有限公司 | A kind of method optimizing converter slag-making |
-
2018
- 2018-08-31 CN CN201811010495.0A patent/CN108977611B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101117651A (en) * | 2006-07-31 | 2008-02-06 | 宝山钢铁股份有限公司 | Converting process for converter low-silicon molten iron |
| CN102994689A (en) * | 2012-11-30 | 2013-03-27 | 武钢集团昆明钢铁股份有限公司 | Method for heat application of low-alkalinity casting residue in steel-making |
| CN103555878A (en) * | 2013-11-25 | 2014-02-05 | 武钢集团昆明钢铁股份有限公司 | Safe and high-efficient low-silicon molten-ion blowing process |
| CN103710484A (en) * | 2014-01-06 | 2014-04-09 | 鞍钢股份有限公司 | Silicon recycling method for controlling casting residue to be recycled to low-silicon steel |
| CN104711388A (en) * | 2015-02-04 | 2015-06-17 | 北京科技大学 | Low-silicon molten iron blowing method |
| CN105219913A (en) * | 2015-11-10 | 2016-01-06 | 湖南华菱湘潭钢铁有限公司 | A kind of method optimizing converter slag-making |
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