CN102220447A - Method for two-step desulfurization of molten iron - Google Patents
Method for two-step desulfurization of molten iron Download PDFInfo
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- CN102220447A CN102220447A CN2011101868501A CN201110186850A CN102220447A CN 102220447 A CN102220447 A CN 102220447A CN 2011101868501 A CN2011101868501 A CN 2011101868501A CN 201110186850 A CN201110186850 A CN 201110186850A CN 102220447 A CN102220447 A CN 102220447A
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- molten iron
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- iron
- quickened lime
- step desulfurization
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- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention relates to a method for two-step desulfurization of molten iron, which comprises the following steps: adding active lime into a molten iron ladle during reladling and tapping, then tapping, performing mixed flushing, and further entering a desulfurization station for blowing magnesium powder for pretreatment of the molten iron and desulfurization. In the method, no equipment is added, no fixed investment is involved, only a part of the bagged active lime needs to be artificially added into the bottom of the iron ladle, therefore, the method is simple and easy to operate, occupies no time of an overhead travelling crane and can ensure continuous production.
Description
Technical field
The invention belongs to field of steel-making, particularly a kind of method of molten iron two step desulfurization.
Background technology
Because after domestic some steel mill adopts titanium ore to protect blast furnace, cause in the molten iron titanium content that (Ti in the base iron＜0.02% that significantly raises is arranged, Ti in the molten iron＞0.12% after the furnace retaining), the pure magnesium powder that blows of steelworks is carried out molten iron pretreatment desulfurizing technology and caused tremendous influence, sulphur in the molten iron once had been difficult to remove, even the phenomenon that molten iron returns sulphur appearred, the huge difficulty of bringing for the desulfurization of converter, lime consumption increases, sticking rifle is serious, sulphur also is difficult to remove, and also causes steel grade finished product sulphur to exceed standard at last, has brought huge difficulty for the stably manufactured of steelworks.If the change sulfur removal technology can interrupt the continuous production of company, and the transformation amount is very big, and effect can't guarantee, through demonstration, from producing or all being infeasible on economy.
Summary of the invention
Technical problem to be solved by this invention provides a kind of method of molten iron two step desulfurization, and method is simple for this, do not increase any equipment, do not have any fixed investment, reduces cost remarkable in economical benefits.
The method of a kind of molten iron two step desulfurization of the present invention comprises:
When tank switching taps a blast furnace, in hot metal ladle, add quickened lime, after tap a blast furnace to mix and dash, go to the desulfurization station to blow magnesium powder molten iron pretreatment desulfurizing again.
The described magnesium powder molten iron pretreatment desulfurizing that blows is for after arriving the desulfurization position when iron ladle, and spray gun is dropped to the operation of jetting of winding-up position automatically, and after processing finished, spray gun is promoted to automatically prepared the operation of skimming then.
Described quickened lime usage quantity is a 0.5-3.0kg/ ton iron.
Described quickened lime usage quantity is a 1.0-2.5kg/ ton iron.
Described quickened lime usage quantity is a 1.5-1.8kg/ ton iron.
Described adding quickened lime is for by at the bottom of manually adding quickened lime iron bag bag.
The present invention has effectively solved the pure phenomenon that the pre-treatment of magnesium powder is difficult to remove to high ferrotianium water sulphur of blowing, also find out simultaneously how to solve and purely blow the desulfurization of magnesium powder to cause molten iron to return sulphur serious, the difficult problem that desulfurization slag is difficult to remove guarantees that molten iron can carry out dark desulfurization, satisfies steelworks production demand.
Beneficial effect
Compared with prior art, advantage of the present invention:
(1) the present invention does not increase any equipment, does not have any fixed investment, can pass through to get final product at the bottom of artificial that part is packed quickened lime adds iron bag bag, and is simple and easy to do, and do not take any overhead traveling crane time, guarantees continuous production.
(2) the present invention can effectively consume the lime powder that steelworks material loading or converter cause when reinforced, makes refuse be utilized effectively.
(3) the present invention can effectively reduce magnesium powder desulfurization consumption, and the economization desulfurization time is obtained remarkable economic efficiency.
(4) the present invention can effectively guarantee no matter to be that high ferrotianium water or common molten iron all can carry out dark desulfurization, and can guarantee that desulfurization slag scratches clean fully.
Description of drawings
Fig. 1 is a process flow diagram of the present invention.
Embodiment
Below in conjunction with specific embodiment, further set forth the present invention.Should be understood that these embodiment only to be used to the present invention is described and be not used in and limit the scope of the invention.Should be understood that in addition those skilled in the art can make various changes or modifications the present invention after the content of having read the present invention's instruction, these equivalent form of values fall within the application's appended claims institute restricted portion equally.
Embodiment 1
When tank switching taps a blast furnace, in hot metal ladle, add quickened lime, after tap a blast furnace to mix and dash, go to the desulfurization station to blow magnesium powder molten iron pretreatment desulfurizing again; Wherein said quickened lime usage quantity is a 0.6kg/ ton iron.
Embodiment 2
When tank switching taps a blast furnace, in hot metal ladle, add quickened lime, after tap a blast furnace to mix and dash, go to the desulfurization station to blow magnesium powder molten iron pretreatment desulfurizing again; Wherein said quickened lime usage quantity is a 1.10kg/ ton iron.
Embodiment 3
When tank switching taps a blast furnace, in hot metal ladle, add quickened lime, after tap a blast furnace to mix and dash, go to the desulfurization station to blow magnesium powder molten iron pretreatment desulfurizing again; Wherein said quickened lime usage quantity is a 1.60kg/ ton iron.
Embodiment 4
When tank switching taps a blast furnace, in hot metal ladle, add quickened lime, after tap a blast furnace to mix and dash, go to the desulfurization station to blow magnesium powder molten iron pretreatment desulfurizing again; Wherein said quickened lime usage quantity is a 1.79kg/ ton iron.
Embodiment 5
When tank switching taps a blast furnace, in hot metal ladle, add quickened lime, after tap a blast furnace to mix and dash, go to the desulfurization station to blow magnesium powder molten iron pretreatment desulfurizing again; Wherein said quickened lime usage quantity is a 2.80kg/ ton iron; The described magnesium powder molten iron pretreatment desulfurizing that blows is for after arriving the desulfurization position when iron ladle, and spray gun is dropped to the operation of jetting of winding-up position automatically, and after processing finished, spray gun is promoted to automatically prepared the operation of skimming then.
Different-effect contrast after the enforcement:
| The index project | Unit | Add lime | Do not add lime |
| The molten iron weight in average | t | 185.7 | 182.8 |
| Before the desulfurization (S) | ×10 -5 | 43.2 | 37.5 |
| After the desulfurization (S) | ×10 -5 | 5.7 | 8.0 |
| Converter terminal (S) | ×10 -5 | 17.0 | 18.0 |
| Return sulfur content | ×10 -5 | 11.3 | 10.0 |
| Return the sulphur rate | ％ | 26.2 | 26.7 |
| Mg powder consumption | kg | 168.2 | 149.2 |
| Mg powder unit consumption | Kg/t | 0.91 | 0.82 |
| The sulphur Mg of unit powder unit consumption | Kg/t.s | 0.024 | 0.028 |
| Lime consumption | kg | 333.0 | 0 |
| Lime consumption | Kg/t | 1.79 | 0 |
| Unit lime unit consumption | Kg/t.s | 0.048 | 0 |
| Dry slag agent consumption | kg | 0 | 50.0 |
| Dry slag agent unit consumption | Kg/t | 0 | 0.27 |
| Dry slag agent unit consumption | Kg/t.s | 0 | 0.01 |
| Unit sulphur consuming cost | Unit/t.s | 0.47 | 0.50 |
Claims (6)
1. the method for a molten iron two step desulfurization comprises:
When tank switching taps a blast furnace, in hot metal ladle, add quickened lime, after tap a blast furnace to mix and dash, go to the desulfurization station to blow magnesium powder molten iron pretreatment desulfurizing again.
2. the method for a kind of molten iron two step desulfurization according to claim 1, it is characterized in that: the described magnesium powder molten iron pretreatment desulfurizing that blows is for after arriving the desulfurization position when iron ladle, spray gun is dropped to the winding-up position automatically, the operation of jetting, after processing finishes, spray gun is promoted to automatically prepares position, the operation of skimming then.
3. the method for a kind of molten iron two step desulfurization according to claim 1, it is characterized in that: described quickened lime usage quantity is a 0.5-3.0kg/ ton iron.
4. the method for a kind of molten iron two step desulfurization according to claim 1, it is characterized in that: described quickened lime usage quantity is a 1.0-2.5kg/ ton iron.
5. the method for a kind of molten iron two step desulfurization according to claim 1, it is characterized in that: described quickened lime usage quantity is a 1.5-1.8kg/ ton iron.
6. the method for a kind of molten iron according to claim 1 two step desulfurization is characterized in that: described adding quickened lime is for by at the bottom of manually adding quickened lime iron bag bag.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101868501A CN102220447A (en) | 2011-07-05 | 2011-07-05 | Method for two-step desulfurization of molten iron |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101868501A CN102220447A (en) | 2011-07-05 | 2011-07-05 | Method for two-step desulfurization of molten iron |
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| CN102220447A true CN102220447A (en) | 2011-10-19 |
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| CN2011101868501A Pending CN102220447A (en) | 2011-07-05 | 2011-07-05 | Method for two-step desulfurization of molten iron |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103820595A (en) * | 2014-02-28 | 2014-05-28 | 北京首钢股份有限公司 | Molten iron desulphurization method |
| CN104498672A (en) * | 2014-12-29 | 2015-04-08 | 首钢水城钢铁（集团）有限责任公司 | Method for desulfurizing molten iron |
| CN111206134A (en) * | 2020-02-24 | 2020-05-29 | 本钢板材股份有限公司 | Method for improving desulfurization effect by adding limestone in molten iron desulfurization by blowing method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101104874A (en) * | 2006-08-24 | 2008-01-16 | 首钢总公司 | Method for processing refined-smelting ladle furnace deep desulfurization finally slag |
| JP2008133490A (en) * | 2006-11-27 | 2008-06-12 | Jfe Steel Kk | Method for desulfurizing molten pig iron |
| CN101532073A (en) * | 2009-04-14 | 2009-09-16 | 中冶实久建设有限公司 | A desulfurizing process |
-
2011
- 2011-07-05 CN CN2011101868501A patent/CN102220447A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101104874A (en) * | 2006-08-24 | 2008-01-16 | 首钢总公司 | Method for processing refined-smelting ladle furnace deep desulfurization finally slag |
| JP2008133490A (en) * | 2006-11-27 | 2008-06-12 | Jfe Steel Kk | Method for desulfurizing molten pig iron |
| CN101532073A (en) * | 2009-04-14 | 2009-09-16 | 中冶实久建设有限公司 | A desulfurizing process |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103820595A (en) * | 2014-02-28 | 2014-05-28 | 北京首钢股份有限公司 | Molten iron desulphurization method |
| CN104498672A (en) * | 2014-12-29 | 2015-04-08 | 首钢水城钢铁（集团）有限责任公司 | Method for desulfurizing molten iron |
| CN111206134A (en) * | 2020-02-24 | 2020-05-29 | 本钢板材股份有限公司 | Method for improving desulfurization effect by adding limestone in molten iron desulfurization by blowing method |
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Application publication date: 20111019 |