CN104294001A - Converter steelmaking method - Google Patents
Converter steelmaking method Download PDFInfo
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- CN104294001A CN104294001A CN201410480844.0A CN201410480844A CN104294001A CN 104294001 A CN104294001 A CN 104294001A CN 201410480844 A CN201410480844 A CN 201410480844A CN 104294001 A CN104294001 A CN 104294001A
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- molten iron
- converter
- ladle
- slag
- iron
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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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- Carbon Steel Or Casting Steel Manufacturing (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention discloses a converter steelmaking method and relates to the field of mechanical forging. The converter steelmaking method comprises the treatments of seven steps of molten iron pretreatment, molten iron blending, waste steel block loading, lancing setting, slag charging, tapping and drossing; the molten iron is desulfurized in an iron mixing car at low cost and high efficiency; a molten iron ladle car supplies the molten iron in such a manner that the steps of blast furnace molten iron receiving, transporting, buffering storage, converter molten iron blending and the like are all carried out in the molten iron ladle car, and therefore, the loss of the molten iron and the dissipation of heat are low and the energy sources are saved; the waste steel blocks are added to the converter and reutilized so that the resources are saved and a better environmental protection effect is achieved; a spray lance is inserted deeply into the molten iron to inject oxygen, and a redox reaction is performed between the molten iron and the slag, and the oxygen so that such impurities as phosphorus, sulfur and silicon can be removed efficiently; in the tapping process, an iron alloy is added to a steel ladle for deoxidization and alloying so that the produced steel is high in plasticity and not easy to crack in the rolling process; the residual slag is poured into a slag pot and can be transported to a cement plant for producing cement.
Description
Technical field
The invention belongs to mechanical forging field, be specifically related to a kind of method of converter steelmaking.
Background technology
Converter steelmaking is mainly the method for making steel of raw material with liquid pig iron, in the main physical thermal by liquid pig iron in converter and the pig iron, each component and the oxygen sent in stove carry out the heat that chemical reaction produces, metal is made to reach composition and the temperature of tapping requirement, along with the progressively quickening that China's industrialization is built, need a large amount of high-quality steel, obtain high-quality steel then needs a kind of good smelting process.China Patent No. is: the file of 201010232281.5 discloses a kind of method of converter steelmaking, will return mine to join in described converter, and be blended into molten iron, gas spray gun is inserted in converter and blows, add slag making materials, stop blowing when the temperature of molten steel and composition reach requirement, the molten steel in converter is made to flow in ladle, and reductor is added in ladle, the quality of steel-making can be improved, and can production cost be reduced.But this invention efficiently can not reduce the sulphur content in molten iron, reduce the loss of molten iron in the technique of hot metal charging and scattering and disappearing of heat, cannot recycle scrap steel block, thus reach energy-conserving and environment-protective, the impurity such as phosphorus, sulphur, silicon can not be sloughed efficiently, the plasticity of the steel produced is not strong, can crack during rolling.
Summary of the invention
For the deficiency that prior art exists, the invention provides a kind of method of converter steelmaking.
To achieve these goals, the present invention realizes by the following technical solutions:
A kind of method of converter steelmaking:
1) hot metal pretreatment: molten iron is carried out desulfurization in metal mixer car;
2) hot metal charging: use hot-metal ladle and carriage method of supplying to be blended in converter by molten iron;
3) scrap steel block is filled: in converter, add scrap steel block, shake positive body of heater simultaneously; Described scrap steel block is the most childlike in 1/3 of furnace port diameter, and maximum secting area is not more than 1/7 of fire door area, and monolithic weight is 150kg-2000kg;
4) rifle under: the oxygen of pressure 0.8MPa ~ 1.2MPa, purity more than 99.5% is sprayed in stove by fire door with a water cooled lance;
5) add slag charge: while lower rifle, in stove, add slag charge by the subsidiary material chute above fire door; The amount of described slag charge is about l/2-2/3 of molten iron total amount;
6) tap: when liquid steel temperature reaches 1300 DEG C, open tap hole, the tapping of falling stove, meanwhile, in tapping process, in ladle, add iron alloy, carry out component controlling;
7) skim: tap and completely just shake by stove, recrement pours slag ladle into.
In the method for above-mentioned converter steelmaking, described step 2) in, described converter is the converter of cylinder ball-type.
In the method for above-mentioned converter steelmaking, in described step 3), described scrap steel block loads converter by steel scrap charging vehicle.
In the method for above-mentioned converter steelmaking, in described step 4), described oxygen is 18min-22min by the time.
Adopt technical scheme of the present invention, by molten iron is carried out desulfurization in metal mixer car, cost is low, efficiency is high, the mode of hot-metal ladle and carriage supply molten iron, by blast-melted undertaking, transport, buffer reservoir, the operations such as converter hot metal charging are all carried out in hot-metal ladle and carriage, the loss of molten iron and the lost little of heat, save energy, scrap steel block is added in converter, scrap steel block is reused, save resource, environmental protection more, spray gun inserts molten iron depths injecting oxygen, molten iron and slag charge and oxygen carry out redox reaction, efficiently can remove dephosphorization, sulphur, the impurity such as silicon, in tapping process, iron alloy is added in ladle, carry out component controlling, the plasticity of the steel produced is strong, not easily crack during rolling, recrement pours slag ladle into, cement mill can be sent to and manufacture cement.
Use the converter of cylinder ball-type, simple shape, build by laying bricks or stones and facilitate furnace shell easy to manufacture, molten bath inner mold is the track that circulates of molten metal relatively, when molten bath diameter is enough large, blowing under larger oxygen supply intensity can be ensured and splash is minimum, also can ensure enough pool depths, make furnace lining have the higher life-span.
Embodiment
The technique means realized for making the present invention, creation characteristic, reaching object and effect is easy to understand, below in conjunction with embodiment, setting forth the present invention further.
One, hot-metal ladle and carriage method of supplying:
That the operations such as blast-melted undertaking, transport, buffer reservoir, converter hot metal charging are all carried out in hot-metal ladle and carriage.
Two, technical process:
1) hot metal pretreatment: molten iron is carried out desulfurization in metal mixer car, cost is low, efficiency is high.
2) hot metal charging: use hot-metal ladle and carriage method of supplying to be blended in converter by molten iron, the loss of molten iron and the lost little of heat, save energy.
3) scrap steel block is filled: in converter, add scrap steel block, shake positive body of heater simultaneously, described scrap steel block is the most childlike in 1/3 of furnace port diameter, maximum secting area is not more than 1/7 of fire door area, and monolithic weight is 150kg-2000kg, and scrap steel block is reused, save resource, more environmental protection.
4) rifle under: sprayed in stove by fire door with the oxygen of a water cooled lance by pressure 0.8MPa ~ 1.2MPa, purity more than 99.5%.
5) slag charge is added: while lower rifle, in stove, slag charge is added by the subsidiary material chute above fire door, the amount of described slag charge is about l/2-2/3 of molten iron total amount, and molten iron and slag charge and oxygen carry out redox reaction, efficiently can remove the impurity such as dephosphorization, sulphur, silicon.
6) tap: when liquid steel temperature reaches 1300 DEG C, open tap hole, the tapping of falling stove, meanwhile, in tapping process, in ladle, add iron alloy, carry out component controlling, the plasticity of the steel produced is strong, not easily cracks during rolling.
7) skim: tap and completely just shake by stove, recrement pours slag ladle into, cement mill can be sent to and manufacture cement.
embodiment 1:
In Process of Hot Metal Charging, described converter is the converter of cylinder ball-type, simple shape, build by laying bricks or stones and facilitate furnace shell easy to manufacture, molten bath inner mold is the track that circulates of molten metal relatively, when molten bath diameter is enough large, can ensure blowing under larger oxygen supply intensity and splash is minimum, also can ensure enough pool depths, make furnace lining have the higher life-span.
When filling scrap steel block, with steel scrap charging vehicle, scrap steel block is loaded converter.
In lower rifle technique, oxygen is 18min-22min by the time.
The composition adding slag charge is lime, fluorite, iron scale and iron ore.
embodiment 2:
All the other are identical with described embodiment 1, difference is, converter in hot metal charging side's technique is the converter of conisphere type, this type of furnace is compared with the cylinder ball-type converter of same capacity, if pool depth is identical, then molten bath area ratio cylinder ball-type is large, be conducive to the carrying out of metallurgical reaction, meanwhile, along with the erosion molten bath change of furnace lining is less, favourable to steel making operation.
embodiment 3:
All the other are identical with described embodiment 1, and difference is, in lower rifle technique, change the oxygen of the purity more than 99.5% sprayed into into air, and meanwhile, add into the equal lime powder of oxygen level, heat can reduce, and products obtained therefrom does not affect result of use.
The present invention is applicable to the method using other stove and accessory to make steel, as by 2) in converter change electric furnace into, in-furnace temperature controls at about 1300 DEG C.
Known in practical application, the present invention by carrying out desulfurization by molten iron in metal mixer car, cost is low, efficiency is high, the mode of hot-metal ladle and carriage supply molten iron, the loss of molten iron and the lost little of heat, save energy, scrap steel block is added in converter, scrap steel block is reused, save resource, environmental protection more, spray gun inserts molten iron depths injecting oxygen, molten iron and slag charge and oxygen carry out redox reaction, efficiently can remove dephosphorization, sulphur, the impurity such as silicon, in tapping process, iron alloy is added in ladle, carry out component controlling, the plasticity of the steel produced is strong, not easily crack during rolling, recrement pours slag ladle into, cement mill can be sent to and manufacture cement.
More than show and describe ultimate principle of the present invention and principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and specification sheets just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.Application claims protection domain is defined by appending claims and equivalent thereof.
Claims (4)
1. a method for converter steelmaking, is characterized in that,
Hot metal pretreatment: molten iron is carried out desulfurization in metal mixer car;
Hot metal charging: use hot-metal ladle and carriage method of supplying to be blended in converter by molten iron;
Dress scrap steel block: add scrap steel block in converter, shake positive body of heater simultaneously; Described scrap steel block is the most childlike in 1/3 of furnace port diameter, and maximum secting area is not more than 1/7 of fire door area, and monolithic weight is 150kg-2000kg;
Lower rifle: the oxygen of pressure 0.8MPa ~ 1.2MPa, purity more than 99.5% is sprayed in stove by fire door with a water cooled lance;
Add slag charge: while lower rifle, in stove, add slag charge by the subsidiary material chute above fire door; The amount of described slag charge is about l/2-2/3 of molten iron total amount;
Tapping: when liquid steel temperature reaches 1300 DEG C, open tap hole, the tapping of falling stove, meanwhile, in tapping process, add iron alloy in ladle, carry out component controlling;
Skim: tap and completely just shake by stove, recrement pours slag ladle into.
2. the method for a kind of converter steelmaking according to claim 1, is characterized in that, described step 2) in, described converter is the converter of cylinder ball-type.
3. the method for a kind of converter steelmaking according to claim 1, is characterized in that, in described step 3), described scrap steel block loads converter by steel scrap charging vehicle.
4. the method for a kind of converter steelmaking according to claim 1, is characterized in that, in described step 4), described oxygen is 18min-22min by the time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410480844.0A CN104294001A (en) | 2014-09-19 | 2014-09-19 | Converter steelmaking method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410480844.0A CN104294001A (en) | 2014-09-19 | 2014-09-19 | Converter steelmaking method |
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| CN104294001A true CN104294001A (en) | 2015-01-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410480844.0A Pending CN104294001A (en) | 2014-09-19 | 2014-09-19 | Converter steelmaking method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108570527A (en) * | 2018-04-19 | 2018-09-25 | 芜湖新兴铸管有限责任公司 | The method of steelmaking converter control nitrogen |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101333579A (en) * | 2008-08-06 | 2008-12-31 | 攀钢集团成都钢铁有限责任公司 | Method for producing tube blank steel for nuclear electricity |
| CN101857911A (en) * | 2010-07-16 | 2010-10-13 | 四川省达州钢铁集团有限责任公司 | Method for steelmaking by using converter |
| CN102041444A (en) * | 2010-12-21 | 2011-05-04 | 南阳汉冶特钢有限公司 | Low-carbon low-silicon high-quality carbon structural steel and production method thereof |
| CN102618691A (en) * | 2012-04-16 | 2012-08-01 | 四川省达州钢铁集团有限责任公司 | Method for producing HRB 600 high-strength steel through micro-alloying |
-
2014
- 2014-09-19 CN CN201410480844.0A patent/CN104294001A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101333579A (en) * | 2008-08-06 | 2008-12-31 | 攀钢集团成都钢铁有限责任公司 | Method for producing tube blank steel for nuclear electricity |
| CN101857911A (en) * | 2010-07-16 | 2010-10-13 | 四川省达州钢铁集团有限责任公司 | Method for steelmaking by using converter |
| CN102041444A (en) * | 2010-12-21 | 2011-05-04 | 南阳汉冶特钢有限公司 | Low-carbon low-silicon high-quality carbon structural steel and production method thereof |
| CN102618691A (en) * | 2012-04-16 | 2012-08-01 | 四川省达州钢铁集团有限责任公司 | Method for producing HRB 600 high-strength steel through micro-alloying |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108570527A (en) * | 2018-04-19 | 2018-09-25 | 芜湖新兴铸管有限责任公司 | The method of steelmaking converter control nitrogen |
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Application publication date: 20150121 |