CN107287378A - A kind of method of the double acting energy high-efficiency desulfurization of molten iron - Google Patents
A kind of method of the double acting energy high-efficiency desulfurization of molten iron Download PDFInfo
- Publication number
- CN107287378A CN107287378A CN201610211547.5A CN201610211547A CN107287378A CN 107287378 A CN107287378 A CN 107287378A CN 201610211547 A CN201610211547 A CN 201610211547A CN 107287378 A CN107287378 A CN 107287378A
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- Prior art keywords
- iron
- desulfurizing agent
- molten iron
- desulfurization
- efficient desulfurizing
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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
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/02—Dephosphorising or desulfurising
-
- 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
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/02—Dephosphorising or desulfurising
- C21C1/025—Agents used for dephosphorising or desulfurising
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The method that the present invention provides a kind of double acting energy high-efficiency desulfurization of molten iron, (2~3) are pressed by the agstone, calcium lime powder and Fluorspar Powder of particle diameter≤200 μm：(6~7)：Dried after the ratio mixing of (1~1.2), 5~20mm of diameter spheroid efficient desulfurizing agent is made in 200~300 DEG C of drying temperature, 2~3h of time on pelletizer.When tank switching folding iron reaches 1/5, efficient desulfurizing agent is added in hot-metal bottle by feeding chute, is 4~15kg/ tons of iron according to desulfurization desired value efficient desulfurizing agent addition, and terminated before folding iron to 2/3.Molten iron is directly skimmed after having rolled over to position of skimming, and the molten iron after skimming directly enters converter smelting.Inventive desulfurization efficiency high, is not take up the production run time, can shorten the production cycle of steel-making, can effectively solve the problem that because desulfurization position production capacity is less than the problem for the desulfurization process limitation organization of production operation that converter is caused.
Description
Technical field
The invention belongs to technical field of hot metal pretreatment, more particularly to it is a kind of using rolling over during iron the impact energy of molten iron and efficiently de-
The method that the foaming stirring power of sulphur agent carries out high-efficiency desulfurization.
Background technology
It is very many about the report of desulfurizing iron both at home and abroad.For desulfurization in fish torpedo ladle, because the shape of fish torpedo ladle is special, injection
Flow field dead band is larger, and pool depth is shallower, determines that the dynamic conditions of its desulfurizing iron is poor.Tank mouth dry slag be blown simultaneously after
Dross is serious, and cleaning work amount is big.The steel mills such as domestic Baosteel, Wuhan Iron and Steel Plant are using desulfurization in fish torpedo ladle.External Japan, example
Such as also there is the report of desulfurization in fish torpedo ladle in steel mill of Nippon Steel.The method of desulfurization is then more in hot-metal bottle, have composite blowing desulfurization,
Singly-blowing magnesium grain blowing desulfurization, KR stirring desulphurizations etc., domestic application is quite varied, external technology also all comparative maturity.It is domestic
Day steel, this steel, Shoudu Iron and Steel Co, Pan Gangdeng enterprises the container of pre- desulfurization, external most steel mills are all used as using hot-metal bottle
It is using desulfurization in hot-metal bottle.
On molten iron desulfurizing method, mainly there are two kinds of KR methods and blowing process.KR methods are that nippon is developed in nineteen sixty-five, its
Good with dynamic conditions, desulfuration efficiency is high, pulvis low cost and other advantages, and domestic Wuhan Iron and Steel Plant, Ma Gang, Shoudu Iron and Steel Co use this method.
But the subject matter existed is that the stirring-head life-span is relatively low, and hot-metal bottle Clearance requirement is larger, and the quantity of slag is big, iron loss is big.And blowing process
Device systems are relatively complicated, and the control parameter required precision to injection system is higher, but capital expenditure is less, current Anshan iron and steel plant,
This steel, climb steel, Baosteel one steel-making etc. enterprise use the method.
The species of desulfurizing iron pulvis is a lot.Conventional has calcium fimily desulfurizing agent, magnesium based desulphurizer, sodium fimily desulfurizing agent.These desulfurization
Agent can be used alone, and can also be used in mixed way.The desulphurizing ability of desulfurizing agent, the desulfurization limit, pulvis cost are all selective sweetenings
The important evidence of agent.Conventional at present is passive oxidation calcium, the granular magnesium of desulfurizing agent, and calcium oxide is answered with passive metal magnesium powder
Close injection.KR fados use the lower-cost calcium fimily desulfurizing agent of pulvis, and granular magnesium and composite desulfurizing agent are used blowing process more.For example
Shoudu Iron and Steel Co capital Tang steel adds calcium oxide using KR methods and carries out desulfurization, and this steel then carries out desulfurization using the independent granular magnesium of blowing process.From master
Want from the point of view of technical indicator, the magnesium based desulphurizer quantity of slag is small, and treatment temperature is low, and iron loss is few, desulphurizing ability is strong, with other desulfurizing agent phases
Than showing slightly advantage.
It is relevant to carry out desulfurization during molten iron rolls over iron although report is all quite a lot of both at home and abroad for various sulfur methods, it is domestic
Any report about this respect is there is no so far outside.
The content of the invention
The purpose of the present invention be on the one hand using fish torpedo ladle folding iron during, the enormous impact produced by drop of the flowing molten iron more than 10 meters
Kinetic energy carries out desulfurization stirring；On the other hand a large amount of bubbles that can be produced by efficient desulfurizing agent with molten iron fast reaction are aided in
Stirring, realizes macroscopical double acting energy high-efficiency desulfurization linked with microcosmic kinetic energy.
Therefore, the technical solution that the present invention is taken is：
A kind of molten iron it is double acting can high-efficiency desulfurization method, its specific method is：
(1) agstone, calcium lime powder and Fluorspar Powder are ground to form to the fine powder of particle diameter≤200 μm respectively, according to (2~3)：
(6~7)：The ratio mixing of (1~1.2)；
(2) mixed powder is subjected to drying and processing, drying temperature is 200~300 DEG C, 2~3h of drying time, after drying
Stir；
(3) a diameter of 5~20mm spheroid efficient desulfurizing agent is made in the powder after stirring on pelletizer；
(4) by efficient desulfurizing agent in the desulfurizing agent feed bin between tank switching；
(5) tank switching rolls over iron operation to 1/5, i.e., when folding iron reaches 1/5, efficient desulfurizing agent is added into molten iron via feeding chute
In tank, it is ensured that feeding chute coal addition position be molten iron center of impact area, according to desulfurization desired value efficient desulfurizing agent addition be 4~
15kg/ tons of iron；
(6) addition of efficient desulfurizing agent need to terminate before folding iron to 2/3, when efficient desulfurizing agent is had sufficient reaction after adding
Between；Mean temperature when molten iron rolls over iron is 1400 ± 10 DEG C, efficient desulfurizing agent spheroid kickback at high temperature, can be produced a large amount of
Gas Stirring iron liquid, in addition flowing molten iron high-altitude percussion, reaction is terminated in 3min；The folding iron later stage is not added with high-efficiency desulfurization
Agent, time enough and space are reserved so as to be overflowed to bubble；
(7) molten iron is directly skimmed after having rolled over to position of skimming, it is ensured that clinker is scratched clean；
(8) molten iron after skimming directly enters converter smelting.
The activity of the calcium lime powder is more than 300ml.
Beneficial effects of the present invention are：
1st, the present invention can solve the problem that because desulfurization position production capacity is less than converter, so as to cause desulfurization process to limit organization of production operation
Problem；
2nd, inventive desulfurization process is not take up the production run time, can shorten the production cycle of steel-making；
3rd, the present invention makes full use of molten iron to roll over the impact kinetic energy that the high drop of iron is produced, and makees with reference to the foaming strong agitation of efficient desulfurizing agent
With its desulfuration efficiency is high, with great potential benefit.
Embodiment
Embodiment 1：By taking 260 tons of hot-metal bottle desulfurization as an example
The 1st, calcium lime powder and Fluorspar Powder that agstone, activity are more than 300ml are ground to form to the fine powder of particle diameter≤200 μm respectively,
According to 3：6：1 ratio mixing.
2nd, mixed powder is subjected to drying and processing, drying temperature is 200 DEG C, and drying time 3h stirs after drying.
3rd, a diameter of 10mm spheroid efficient desulfurizing agent is made in the powder after stirring on pelletizer.
4th, by efficient desulfurizing agent in the desulfurizing agent feed bin between tank switching.
5th, tank switching folding iron reaches 50 ton hours, starts via feeding chute to add efficient desulfurizing agent in hot-metal bottle, it is ensured that blanking
Chute coal addition position is molten iron center of impact area, and the folding ton hour of iron 150 terminates, according to desulfurization desired value, adds 1.5 tons and efficiently takes off
Sulphur agent.Molten iron temperature is 1410 DEG C when rolling over iron, and initial S contents are 0.025%, and S contents are 0.008% after desulfurization.
6th, molten iron is directly skimmed after having rolled over to position of skimming, it is ensured that clinker is scratched clean.
7th, the molten iron after skimming directly enters converter smelting according to converter plan.
Embodiment 2：By taking 260 tons of hot-metal bottle desulfurization as an example
The 1st, calcium lime powder and Fluorspar Powder that agstone, activity are more than 300ml are ground to form to the fine powder of particle diameter≤200 μm respectively,
According to 2：7：1 ratio mixing.
2nd, mixed powder is subjected to drying and processing, drying temperature is 300 DEG C, and drying time 2h stirs after drying.
3rd, a diameter of 15mm spheroid efficient desulfurizing agent is made in the powder after stirring on pelletizer.
4th, by efficient desulfurizing agent in the desulfurizing agent feed bin between tank switching.
5th, tank switching folding iron reaches 50 ton hours, starts via feeding chute to add efficient desulfurizing agent in hot-metal bottle, it is ensured that blanking
Chute coal addition position is molten iron center of impact area, and the folding ton hour of iron 180 terminates, according to desulfurization desired value, adds 1.8 tons and efficiently takes off
Sulphur agent.Molten iron temperature is 1400 DEG C when rolling over iron, and initial S contents are 0.028%, and S contents are 0.007% after desulfurization.
6th, molten iron is directly skimmed after having rolled over to position of skimming, it is ensured that clinker is scratched clean.
7th, the molten iron after skimming directly enters converter smelting according to converter plan.
Embodiment 3：By taking 260 tons of hot-metal bottle desulfurization as an example
The 1st, calcium lime powder and Fluorspar Powder that agstone, activity are more than 300ml are ground to form to the fine powder of particle diameter≤200 μm respectively,
According to 2.5：6.5：1.1 ratio mixing.
2nd, mixed powder is subjected to drying and processing, drying temperature is 250 DEG C, and drying time 2.5h stirs after drying.
3rd, a diameter of 8mm spheroid efficient desulfurizing agent is made in the powder after stirring on pelletizer.
4th, by efficient desulfurizing agent in the desulfurizing agent feed bin between tank switching.
5th, tank switching folding iron reaches 65 ton hours, starts via feeding chute to add efficient desulfurizing agent in hot-metal bottle, it is ensured that blanking
Chute coal addition position is molten iron center of impact area, and the folding ton hour of iron 165 terminates, according to desulfurization desired value, adds 1.65 tons and efficiently takes off
Sulphur agent.Molten iron temperature is 1395 DEG C when rolling over iron, and initial S contents are 0.026%, and S contents are 0.0075% after desulfurization.
6th, molten iron is directly skimmed after having rolled over to position of skimming, it is ensured that clinker is scratched clean.
7th, the molten iron after skimming directly enters converter smelting according to converter plan.
Claims (2)
1. a kind of molten iron it is double acting can high-efficiency desulfurization method, it is characterised in that specific method is：
(1) agstone, calcium lime powder and Fluorspar Powder are ground to form to the fine powder of particle diameter≤200 μm respectively, pressed
According to (2~3)：(6~7)：The ratio mixing of (1~1.2)；
(2) mixed powder is subjected to drying and processing, drying temperature is 200~300 DEG C, drying time 2~
Stirred after 3h, drying；
(3) a diameter of 5~20mm spheroid efficient desulfurizing agent is made in the powder after stirring on pelletizer；
(4) by efficient desulfurizing agent in the desulfurizing agent feed bin between tank switching；
(5) tank switching rolls over iron operation to 1/5, i.e., when folding iron reaches 1/5, by efficient desulfurizing agent via blanking
Chute is added in hot-metal bottle, it is ensured that feeding chute coal addition position is molten iron center of impact area, according to desulfurization target
It is 4~15kg/ tons of iron to be worth efficient desulfurizing agent addition；
(6) addition of efficient desulfurizing agent need to terminate before folding iron to 2/3, efficient desulfurizing agent is had after adding
The sufficient reaction time；Mean temperature during molten iron folding iron is 1400 ± 10 DEG C, and efficient desulfurizing agent spheroid is in height
The lower kickback of temperature, can produce substantial amounts of Gas Stirring iron liquid, in addition the high-altitude percussion of flowing molten iron, make anti-
It should terminate in 3min；The folding iron later stage is not added with efficient desulfurizing agent, and time enough is reserved so as to be overflowed to bubble
And space；
(7) molten iron is directly skimmed after having rolled over to position of skimming, it is ensured that clinker is scratched clean；
(8) molten iron after skimming directly enters converter smelting.
2. the method for the double acting energy high-efficiency desulfurization of molten iron according to claim 1, it is characterised in that described
The activity of calcium lime powder is more than 300ml.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610211547.5A CN107287378A (en) | 2016-04-04 | 2016-04-04 | A kind of method of the double acting energy high-efficiency desulfurization of molten iron |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610211547.5A CN107287378A (en) | 2016-04-04 | 2016-04-04 | A kind of method of the double acting energy high-efficiency desulfurization of molten iron |
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| Publication Number | Publication Date |
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| CN107287378A true CN107287378A (en) | 2017-10-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610211547.5A Pending CN107287378A (en) | 2016-04-04 | 2016-04-04 | A kind of method of the double acting energy high-efficiency desulfurization of molten iron |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111548818A (en) * | 2020-04-10 | 2020-08-18 | 佛山华清智业环保科技有限公司 | Composite desulfurizer and preparation method thereof |
| CN113106183A (en) * | 2021-04-17 | 2021-07-13 | 乌海市包钢万腾钢铁有限责任公司 | Molten iron desulfurizer adding method for steelmaking |
| CN115386682A (en) * | 2022-08-30 | 2022-11-25 | 江苏沙钢集团有限公司 | Two-step deep iron desulphurization device and process method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1955319A (en) * | 2005-10-25 | 2007-05-02 | 上海盛宝钢铁冶金炉料有限公司 | Desulfurizing agent for hot-metal preprocess |
| CN102586547A (en) * | 2012-03-13 | 2012-07-18 | 鞍钢股份有限公司 | Production method for low-cost clean steel |
-
2016
- 2016-04-04 CN CN201610211547.5A patent/CN107287378A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1955319A (en) * | 2005-10-25 | 2007-05-02 | 上海盛宝钢铁冶金炉料有限公司 | Desulfurizing agent for hot-metal preprocess |
| CN102586547A (en) * | 2012-03-13 | 2012-07-18 | 鞍钢股份有限公司 | Production method for low-cost clean steel |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111548818A (en) * | 2020-04-10 | 2020-08-18 | 佛山华清智业环保科技有限公司 | Composite desulfurizer and preparation method thereof |
| CN113106183A (en) * | 2021-04-17 | 2021-07-13 | 乌海市包钢万腾钢铁有限责任公司 | Molten iron desulfurizer adding method for steelmaking |
| CN115386682A (en) * | 2022-08-30 | 2022-11-25 | 江苏沙钢集团有限公司 | Two-step deep iron desulphurization device and process method |
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Application publication date: 20171024 |
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