CN108384915A - A kind of removing titanium in molten iron method before State of Blast Furnace - Google Patents
A kind of removing titanium in molten iron method before State of Blast Furnace Download PDFInfo
- Publication number
- CN108384915A CN108384915A CN201810187400.6A CN201810187400A CN108384915A CN 108384915 A CN108384915 A CN 108384915A CN 201810187400 A CN201810187400 A CN 201810187400A CN 108384915 A CN108384915 A CN 108384915A
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- Prior art keywords
- titanium
- molten iron
- blast furnace
- agent
- iron
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Classifications
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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
- C21C1/04—Removing impurities other than carbon, phosphorus or sulfur
-
- 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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
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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 present invention provides a kind of removing titanium in molten iron methods before State of Blast Furnace, including：De-titanium agent is added in the molten iron of blast furnace iron outlet groove, the molten iron falls to reaching and be stirred in fish torpedo ladle later, and the molten iron carries out de- titanium reaction；The supplying speed of the de-titanium agent is 1~3kg/s.The method of the present invention does not change the existing mode of production, flow, de-titanium agent can be uniformly added into blast furnace iron outlet groove, and by molten iron flow and the offer kinetic reaction that falls after de-titanium agent addition, so that de-titanium agent is sufficiently mixed with molten iron, reaction can be carried out fully, and de- titanium is efficient, and scene is adaptable.
Description
Technical field
The invention belongs to a kind of removing titanium in molten iron methods before ironmaking technology field more particularly to State of Blast Furnace.
Background technology
Blast furnace process middle and later periods furnace cylinder maintenance is most important, generally takes plus titanium furnace retaining mode safeguards cupola well, prevent cupola well
Water temperature difference (electric thermo-couple temperature) increases, it is ensured that blast furnace safety produces.In recent years, with the high smelting strength of blast furnace of pursuit, cupola well
Erosion is serious, and some newly opens blast furnace, and production begins to cupola well water temperature difference (electric thermo-couple temperature) raising phenomenon occur for 2,3 years,
It is forced to add titanium furnace retaining, safeguards that cupola well is kept the safety in production.But add titanium furnace retaining that Ti content is necessarily caused in molten iron to increase, Ti and C, O in iron,
The elements such as N have very strong affinity, it is easy to be combined with each other and generate tiny field trash TiO2, TiN and TiC etc., these are thin
Small field trash can significantly reduce rigid cleanliness factor, inhibit crystal grain in annealing process to grow up, reduce the favorable texture of annealing process,
And then the electromagnetic performance of finished product is reduced, especially when producing silicon steel product, the iron loss of silicon steel coil can increase.Therefore, add titanium furnace retaining
Cause in molten iron Ti content increase and later process production silicon steel product requirement molten iron in titaniferous amount it is low be contradictory.
Invention content
In view of the above-mentioned drawbacks in the prior art, the main purpose of the present invention is to provide removing titanium in molten iron before a kind of State of Blast Furnace
Method can effectively remove the Ti content in molten iron.
In order to achieve the above object, the present invention adopts the following technical scheme that：A kind of removing titanium in molten iron method before State of Blast Furnace, packet
It includes：De-titanium agent is added in the molten iron of blast furnace iron outlet groove, the molten iron falls to reaching and be stirred in fish torpedo ladle later, the molten iron into
The de- titanium reaction of row；The supplying speed of the de-titanium agent is 1~3kg/s.
As a further preference, the de-titanium agent is containing Fe2O3Oxidant.
As a further preference, the de-titanium agent composition by weight percent includes：Fe2O3>70%,
S<0.05%, water content<0.5%, CaO<15%, SiO2<8%, MgO<4%, Al2O3<4%.
As a further preference, the de-titanium agent particle size range<2cm.
As a further preference, the de-titanium agent is uniformly blown into molten iron.
As a further preference, the molten iron temperature is 1300-1550 DEG C.
As a further preference, the method further includes：The fish torpedo ladle molten iron enters unified first time behind desulfurization station
It skims.
As a further preference, from the addition de-titanium agent to during described skim, hot metal temperature drop is 120-160 DEG C.
As a further preference, the blast furnace iron outlet groove is located at after slag sluicing system skimming tool.
The beneficial effects of the invention are as follows：Removing titanium in molten iron method before State of Blast Furnace of the present invention, including：In the molten iron of blast furnace iron outlet groove
Middle addition de-titanium agent, the molten iron whereabouts reaches later stirs in fish torpedo ladle, and the molten iron carries out de- titanium reaction；The de-titanium agent
Supplying speed be 1~3kg/s.The method of the present invention does not change the existing mode of production, flow, can be uniform in blast furnace iron outlet groove
De-titanium agent is added, and by molten iron flow and the offer kinetic reaction that falls after de-titanium agent addition so that de-titanium agent is filled with molten iron
Divide mixing, reaction that can fully carry out, de- titanium is efficient, and scene is adaptable.
Specific implementation mode
For the embodiment of the present invention by removing titanium in molten iron method before a kind of State of Blast Furnace of offer, solving existing plus titanium furnace retaining leads to iron
Ti content is increased in water requires the contradiction that titaniferous amount is low in molten iron with later process production silicon steel product, is effectively stripped of in molten iron
Ti content, ensure molten iron in Ti content meet smelting silicon steel demand.
In order to solve drawbacks described above, the main thought of the embodiment of the present invention is：
Removing titanium in molten iron method before State of Blast Furnace of the embodiment of the present invention, including：De-titanium agent is added in the molten iron of blast furnace iron outlet groove,
The molten iron falls to reaching and be stirred in fish torpedo ladle later, and the molten iron carries out de- titanium reaction；The supplying speed of the de-titanium agent is 1
~3kg/s.
De-titanium agent position is added in blast furnace iron outlet groove in present invention method, belongs to non-sealed containers, sky can be used
Gas uniformly conveys de-titanium agent, and de-titanium agent can be carried out fully after being added by molten iron flow and the offer kinetic reaction that falls, reaction,
It is at low cost without individually increasing stirring, and hot metal temperature drop, ingredient etc. change on later process without influence after reaction, it is easy to operate.
It is only the 1~3% of ton iron that mass percent, which is added, in de-titanium agent of the embodiment of the present invention, and to content of titanium dioxide in slag
And basicity of slag is without particular/special requirement, it is applied widely.Hot metal temperature drop, hot metal composition and the amount of skimming meet later process requirement, fish
Thunder tank enters the unification of desulfurization station and skims for the first time.
Above-mentioned de-titanium agent composition by weight percent includes：100%>Fe2O3>70%, S<0.05%, water content<0.5%,
CaO<15%, SiO2<8%, MgO<4%, Al2O3<4%.
It is of the invention to reach the technological means and effect that predetermined goal of the invention is taken further to illustrate, below in conjunction with
Preferred embodiment, to removing titanium in molten iron method before the State of Blast Furnace that proposes according to the present invention, specific implementation mode, feature and its work(
Effect is described in detail as after.In the following description, what different " embodiment " or " embodiment " referred to is not necessarily same implementation
Example.In addition, the special characteristic or feature in one or more embodiments can be combined by any suitable form.
The terms "and/or", only a kind of incidence relation of description affiliated partner, indicates that there may be three kinds of passes
System, for example, A and/or B, is specifically interpreted as：Can include A and B simultaneously, can be with individualism A, it can also individualism
B can have above-mentioned three kinds of any case.
Embodiment 1
Molten iron Central Plains Ti content is not high (0.072%) in the present embodiment, is not added with titanium furnace retaining；Before State of Blast Furnace of the embodiment of the present invention
Removing titanium in molten iron method, including：
It is 1% preparation de-titanium agent of ton iron by mass percentage, first time iron sample is taken to examine ingredient since changing fish torpedo ladle,
Then start to be blown de-titanium agent, spray into iron runner sample tap according to 1kg/s flow velocitys, be about blown 35 minutes, fish torpedo ladle connects a tank iron
Water about 210t, transports to desulfurization station, skims, and takes second of iron sample.
Above-mentioned de-titanium agent composition by weight percent includes：Fe2O3For 75%, S 0.04%, water content 0.3%, CaO
11.66%, SiO27%, MgO 3%, Al2O33%.
Above-mentioned de-titanium agent particle size range is 1.5-1.8cm.
The blast furnace iron outlet groove is located at after slag sluicing system skimming tool.
Testing result and result of calculation see the table below：
As can be seen from the above table, with the method for the present invention when being incorporated mass percent about 1% or so de-titanium agent, titanium rate has been taken off
Reach 56.9%.
Embodiment 2
The present embodiment molten iron Central Plains Ti content is high (0.134%), adds titanium furnace retaining；Molten iron is de- before State of Blast Furnace of the embodiment of the present invention
Titanium method, including：
It is 2% preparation de-titanium agent of ton iron by mass percentage, first time iron sample is taken to examine ingredient since changing fish torpedo ladle,
Then start to be blown de-titanium agent, spray into iron runner sample tap according to 3kg/s flow velocitys, be about blown 15 minutes, fish torpedo ladle connects a tank iron
Water about 210t, transports to desulfurization station, skims, and takes second of iron sample.
Above-mentioned de-titanium agent composition by weight percent includes：Fe2O3For 80%, S 0.02%, water content 0.2%, CaO
10%, SiO25%, MgO 2.78%, Al2O32%.
Above-mentioned de-titanium agent particle size range is 0.8-1.5cm.
Testing result and result of calculation see the table below：
As can be seen from the above table, with the method for the present invention in molten iron Ti content it is high (>0.1%) same that quality hundred is added when
Divide and matched than about 1% de-titanium agent, takes off titanium rate higher, 68.7% can be reached.
Embodiment 3
Molten iron Central Plains Ti content height (0.115%), is not added with titanium furnace retaining in the present embodiment；Iron before State of Blast Furnace of the embodiment of the present invention
Water takes off titanium method, including：
It is 2% preparation de-titanium agent of ton iron by mass percentage, first time iron sample is taken to examine ingredient since changing fish torpedo ladle,
Then start to be blown de-titanium agent, spray into iron runner sample tap according to 2kg/s flow velocitys, be about blown 20 minutes, fish torpedo ladle connects a tank iron
Water about 210t, transports to desulfurization station, skims, and takes second of iron sample.
Above-mentioned de-titanium agent composition by weight percent includes：Fe2O3For 85%, S 0.01%, water content 0.1%, CaO
6%, SiO24.89%, MgO 2%, Al2O32%.
Above-mentioned de-titanium agent particle size range is 0.5-1.0cm.
The blast furnace iron outlet groove is located at after slag sluicing system skimming tool.
Testing result and result of calculation see the table below：
As can be seen from the above table, with the method for the present invention when being incorporated de-titanium agent, de- titanium rate has reached 64.3%.
Embodiment 4
Molten iron Central Plains Ti content is not high (0.072%) in the present embodiment, is not added with titanium furnace retaining；Before State of Blast Furnace of the embodiment of the present invention
Removing titanium in molten iron method, including：
It is 1% preparation de-titanium agent of ton iron by mass percentage, first time iron sample is taken to examine ingredient since changing fish torpedo ladle,
Then start to be blown de-titanium agent, spray into iron runner sample tap according to 1kg/s flow velocitys, be about blown 35 minutes, fish torpedo ladle connects a tank iron
Water about 210t, transports to desulfurization station, skims, and takes second of iron sample.
Above-mentioned de-titanium agent composition by weight percent includes：Fe2O3For 90%, S 0.01%, water content 0.1%, CaO
5%, SiO22.89%, MgO 1%, Al2O31%.
Above-mentioned de-titanium agent particle size range is 0.2-0.5cm.
The blast furnace iron outlet groove is located at after slag sluicing system skimming tool.
Testing result and result of calculation see the table below：
As can be seen from the above table, with the method for the present invention when being incorporated mass percent about 1% or so de-titanium agent, titanium rate has been taken off
Reach 61.1%.
Technical solution in above-mentioned the embodiment of the present application, at least has the following technical effect that or advantage：
Removing titanium in molten iron method before State of Blast Furnace of the present invention, including：De-titanium agent, Zhi Housuo are added in the molten iron of blast furnace iron outlet groove
It states and is stirred in molten iron whereabouts arrival fish torpedo ladle, the molten iron carries out de- titanium reaction；The method of the present invention do not change the existing mode of production,
Flow can be uniformly added into de-titanium agent in blast furnace iron outlet groove, and dynamic by molten iron flow and offer of falling after de-titanium agent addition
Mechanics reacts so that de-titanium agent is sufficiently mixed with molten iron, and reaction can be carried out fully, and de- titanium is efficient, and scene is adaptable.
Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic
Property concept, then additional changes and modifications may be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as
It selects embodiment and falls into all change and modification of the scope of the invention.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
God and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (9)
1. a kind of removing titanium in molten iron method before State of Blast Furnace, it is characterised in that：Including：It is added in the molten iron of blast furnace iron outlet groove and takes off titanium
Agent, the molten iron whereabouts reaches later stirs in fish torpedo ladle, and the molten iron carries out de- titanium reaction；The supplying speed of the de-titanium agent
For 1~3kg/s.
2. removing titanium in molten iron method before State of Blast Furnace according to claim 1, it is characterised in that：The de-titanium agent is containing Fe2O3Oxygen
Agent.
3. removing titanium in molten iron method before State of Blast Furnace according to claim 2, it is characterised in that：The de-titanium agent Ingredients Weight percentage
Than including：Fe2O3>70%, S<0.05%, water content<0.5%, CaO<15%, SiO2<8%, MgO<4%, Al2O3<4%.
4. removing titanium in molten iron method before State of Blast Furnace according to claim 1 or claim 2, it is characterised in that：The de-titanium agent particle size range<
2cm。
5. removing titanium in molten iron method before State of Blast Furnace according to claim 1, it is characterised in that：Uniformly iron is arrived in injection to the de-titanium agent
In water.
6. removing titanium in molten iron method before State of Blast Furnace according to claim 1, it is characterised in that：The molten iron temperature is 1300-
1550℃。
7. removing titanium in molten iron method before State of Blast Furnace according to claim 1, it is characterised in that：The method further includes：The fish
Unification is skimmed for the first time after thunder tank molten iron enters desulfurization station.
8. removing titanium in molten iron method before State of Blast Furnace according to claim 7, it is characterised in that：From the addition de-titanium agent to described
During skimming, hot metal temperature drop is 120-160 DEG C.
9. removing titanium in molten iron method before State of Blast Furnace according to claim 1, it is characterised in that：The blast furnace iron outlet groove is located at slag iron
After separation skimming tool.
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| CN201810187400.6A CN108384915A (en) | 2018-03-07 | 2018-03-07 | A kind of removing titanium in molten iron method before State of Blast Furnace |
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| CN201810187400.6A CN108384915A (en) | 2018-03-07 | 2018-03-07 | A kind of removing titanium in molten iron method before State of Blast Furnace |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110229943A (en) * | 2019-07-15 | 2019-09-13 | 安徽工业大学 | The Adding Way of removing titanium in molten iron agent before a kind of State of Blast Furnace |
| CN110283952A (en) * | 2019-08-05 | 2019-09-27 | 安徽工业大学 | A kind of blast furnace process high-purity pig iron molten iron nitrogen promoter and increasing method for nitrogen |
| CN111455123A (en) * | 2020-06-04 | 2020-07-28 | 北京首钢股份有限公司 | Novel titanium removing agent, preparation method thereof and titanium removing method adopting novel titanium removing agent |
| CN111635973A (en) * | 2020-06-04 | 2020-09-08 | 北京首钢股份有限公司 | Method for removing titanium from molten iron of converter |
| CN111809142A (en) * | 2020-07-21 | 2020-10-23 | 安徽工业大学 | Method for promoting generation and clustering of TiN in high-purity pig iron |
| CN111979473A (en) * | 2020-07-14 | 2020-11-24 | 河南豫中新材料有限公司 | Preparation method of high-purity ferrophosphorus |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60116707A (en) * | 1983-11-30 | 1985-06-24 | Kobe Steel Ltd | Desilicating method in molten pig trough |
| CN101805818A (en) * | 2010-04-01 | 2010-08-18 | 钢铁研究总院 | Method for removing titanium from ladle by using stirring method |
| CN103540709A (en) * | 2013-11-06 | 2014-01-29 | 河北省首钢迁安钢铁有限责任公司 | Method for controlling titanium of pure steel |
| CN103695589A (en) * | 2013-12-13 | 2014-04-02 | 河北省首钢迁安钢铁有限责任公司 | Method for removing titanium in molten iron |
| CN104404190A (en) * | 2014-11-13 | 2015-03-11 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Molten iron desiliconization agent, pouring device and molten iron desiliconization pretreatment method |
-
2018
- 2018-03-07 CN CN201810187400.6A patent/CN108384915A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60116707A (en) * | 1983-11-30 | 1985-06-24 | Kobe Steel Ltd | Desilicating method in molten pig trough |
| CN101805818A (en) * | 2010-04-01 | 2010-08-18 | 钢铁研究总院 | Method for removing titanium from ladle by using stirring method |
| CN103540709A (en) * | 2013-11-06 | 2014-01-29 | 河北省首钢迁安钢铁有限责任公司 | Method for controlling titanium of pure steel |
| CN103695589A (en) * | 2013-12-13 | 2014-04-02 | 河北省首钢迁安钢铁有限责任公司 | Method for removing titanium in molten iron |
| CN104404190A (en) * | 2014-11-13 | 2015-03-11 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Molten iron desiliconization agent, pouring device and molten iron desiliconization pretreatment method |
Non-Patent Citations (2)
| Title |
|---|
| 卜庆元 等: "铁水沟提钒新工艺的研究", 《首届全国冶金工艺理论学术会议论文集》 * |
| 喻爱国 等: "低钛铁水生产实践", 《鞍钢技术》 * |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110229943A (en) * | 2019-07-15 | 2019-09-13 | 安徽工业大学 | The Adding Way of removing titanium in molten iron agent before a kind of State of Blast Furnace |
| CN110283952A (en) * | 2019-08-05 | 2019-09-27 | 安徽工业大学 | A kind of blast furnace process high-purity pig iron molten iron nitrogen promoter and increasing method for nitrogen |
| CN111455123A (en) * | 2020-06-04 | 2020-07-28 | 北京首钢股份有限公司 | Novel titanium removing agent, preparation method thereof and titanium removing method adopting novel titanium removing agent |
| CN111635973A (en) * | 2020-06-04 | 2020-09-08 | 北京首钢股份有限公司 | Method for removing titanium from molten iron of converter |
| CN111455123B (en) * | 2020-06-04 | 2021-12-07 | 北京首钢股份有限公司 | Low-cost titanium removing agent, preparation method thereof and titanium removing method adopting titanium removing agent |
| CN111635973B (en) * | 2020-06-04 | 2022-01-04 | 北京首钢股份有限公司 | Method for removing titanium from molten iron of converter |
| CN111979473A (en) * | 2020-07-14 | 2020-11-24 | 河南豫中新材料有限公司 | Preparation method of high-purity ferrophosphorus |
| CN111979473B (en) * | 2020-07-14 | 2022-03-18 | 河南豫中新材料有限公司 | Preparation method of high-purity ferrophosphorus |
| CN111809142A (en) * | 2020-07-21 | 2020-10-23 | 安徽工业大学 | Method for promoting generation and clustering of TiN in high-purity pig iron |
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Application publication date: 20180810 |