CN102206726A - Method for removing desulfurizing slag from molten iron - Google Patents
Method for removing desulfurizing slag from molten iron Download PDFInfo
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- CN102206726A CN102206726A CN2011101138778A CN201110113877A CN102206726A CN 102206726 A CN102206726 A CN 102206726A CN 2011101138778 A CN2011101138778 A CN 2011101138778A CN 201110113877 A CN201110113877 A CN 201110113877A CN 102206726 A CN102206726 A CN 102206726A
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Abstract
The invention discloses a method for removing desulfurizing slag from molten iron, which comprises the following steps: (1) before desulfurizing molten iron by blowing powder, firstly removing blast furnace slag in the molten iron by using a slag removal machine, and then blowing; (2) after molten iron blowing, standing for 3-5 minutes, removing the desulfurizing slag according to a near-far-ambient principle, evenly putting 100-150 kilograms of slag solidifying agent on the molten iron surface according to the conditions of the desulfurizing slag in the molten iron, and removing the desulfurizing slag again; and (3) removing desulfurizing slag from the molten iron treated by the step (2); for the desulfurizing slag in dead areas of the molten iron ladle, clockwisely or counterclockwisely rotating a slag rake of the slag removal machine, stirring the desulfurizing slag surface so that the desulfurizing slag is away from the dead areas and convenient to remove, meanwhile, shaking the molten iron ladle so that the desulfurizing slag left around the molten iron ladle is centralized and convenient to remove, and repeating the operation of desulfurizing slag removal until the amount of residual desulfurizing slag in the molten iron meets the requirement. The invention can effectively remove desulfurizing slag and has the advantage of low iron loss.
Description
Technical field
The present invention relates to the hot metal pretreatment production field, be specifically related to a kind of method of removing desulfurization slag in the molten iron.
Background technology
Desulfurizing iron is meant by chemical reaction, effectively reduces the sulphur content in the molten iron, and the sulphur content of molten iron is reduced, and satisfies steel-making requirements at last.Molten iron after handling through desulfurization, the desulfurization slag that must will be contained in the molten iron is removed, in order to avoid cause back sulphur during steel-making, i.e. following reaction: MgS+O=MgO+S takes place, CaS+O=CaO+S in the oxidized reduction of MgS or CaS in the desulfurization slag.Therefore, the molten iron through desulfurization is handled only after having removed desulfurization slag, returns sulphur in the time of just avoiding converter smelting, guarantees sweetening effectiveness.The molten steel sulphur content requires low more, and the removal of corresponding requirements desulfurization slag is thorough more, promptly need reduce the band quantity of slag of molten iron as far as possible.
DESULPHURIZATION OF HOT METAL BY POWDER INJECTION is one of main desulfurizing iron method of using at present, and it plays an important role in the production of variety steel, and the removal of desulfurization slag is an important ring of decision desulfurizing iron effect.At present, there is following problem in the removal of desulfurization slag after the DESULPHURIZATION OF HOT METAL BY POWDER INJECTION: when iron loss can be bigger when thorough to the removal of desulfurization slag, influence production efficiency; For reducing iron loss, enhance productivity, need the removal of desulfurization slag is controlled at a zone of reasonableness, cause the removal of desulfurization slag not thorough so again easily, can cause low-sulfur molten iron after the desulfurization to return sulphur when converter smelting, cause converter smelting endpoint sulphur to exceed standard, the fluctuation of converter tapping sulphur is big, the production efficiency of influence steel-making, what further influence was produced carries out smoothly.
Summary of the invention
The object of the present invention is to provide a kind of method of removing desulfurization slag in the molten iron, solve the problem that removal is not thorough, iron loss reaches the fluctuation of converter tapping sulphur greatly of present desulfurization slag.
To achieve these goals, the technical solution used in the present invention is:
The method of desulfurization slag in the described this removal molten iron may further comprise the steps:
(1) before the DESULPHURIZATION OF HOT METAL BY POWDER INJECTION, removes blast furnace slag in the molten iron earlier, then winding-up with slag removal machine;
Select clean and the intact iron ladle of mouth for use; To entering the molten iron at desulfurization station,, follow the near earlier back principle around then far away and earlier blast furnace slag is removed according to the molten iron surface blast furnace quantity of slag; The sample examination molten steel sulfur content is also measured the temperature of molten iron; According to the content of remaining blast furnace slag in the back molten iron of skimming,, again molten iron is jetted once more in the even crust block agent of throwing in 100～150 kilograms of molten iron face;
(2) molten iron is jetted after, allow it leave standstill 3～5 minutes, impel the desulfurization slag in the molten iron fully to float, following the earlier near back principle around then far away removes desulfurization slag, again according to the situation of desulfurization slag in the molten iron, evenly throw in 100～150 kilograms crust block agent at the molten iron face, and then carry out the operation that desulfurization slag removes;
(3) molten iron of handling through step (2) is carried out desulfurization slag once more and remove operation; Desulfurization slag for place, dead angle in the iron ladle, clockwise or rotate counterclockwise slag removal machine slag rake, stir the desulfurization top of the slag, make desulfurization slag be convenient to remove, rock iron ladle simultaneously, the desulfurization slag that stays around the iron ladle is concentrated to the center away from the position, dead angle, be convenient to remove, repeat the operation that desulfurization slag removes, the remaining desulfurization quantity of slag in molten iron reaches requirement, changes molten iron over to subsequent processing.
In order effectively to reduce iron loss, in described step (1), step (2) and the step (3), when desulfurization slag removes, when desulfurization slag arrives the iron ladle mouth, stopped for 5～10 seconds, and lift the slag rake, allow molten iron flow back to iron ladle, to reduce the molten iron loss.
In described step (1) and the step (2), when the molten iron face is thrown in the crust block agent, when the crust block agent is deposited on the molten iron top of the slag, stir back and forth, make the crust block agent be evenly distributed on the molten iron surface with slag removal machine slag rake.
The composition of the crust block agent that is suitable in described step (1) and the step (2) contains Al2O3:6～15 weight parts, granularity≤5mm for containing SiO2:60～80 weight parts.
The invention has the advantages that: the method for desulfurization slag in the described removal molten iron, at first carry out blast furnace slag and remove, add the crust block agent to molten iron surface, jet again and leave standstill the mode of processing, effectively improved the removal effect of desulfurization slag; The operating method that next desulfurization slag removes can be removed the desulfurization slag of position, dead angle in the iron ladle, further improve the removal effect of desulfurization slag; When desulfurization slag removes once more, when desulfurization slag arrives the iron ladle mouth, do slightly to stop and lift the slag rake, allow molten iron flow back to iron ladle, effectively reduced the molten iron loss.By the removal method of desulfurization slag behind the suitable described desulfurizing iron, iron loss reduced when desulfurizing slag of hot metal was removed, and the iron loss of every jar of molten iron is reduced to 3.2t from 4.8t, remarkable benefit.Simultaneously, because desulfurization slag removes thoroughly, time sulphur when molten iron enters converter smelting is few, has guaranteed carrying out smoothly of steel-making.
Embodiment
Description below by to optimum embodiment is described in further detail the specific embodiment of the present invention, to help those skilled in the art design of the present invention, technical scheme is had more complete, accurate and deep understanding.
Embodiment one
The method of desulfurization slag in the described removal molten iron may further comprise the steps:
(1) before the DESULPHURIZATION OF HOT METAL BY POWDER INJECTION, removes blast furnace slag in the molten iron earlier, then winding-up with slag removal machine;
Select clean and the intact iron ladle of mouth for use; To entering the molten iron at desulfurization station,, follow the near earlier back principle around then far away and earlier blast furnace slag is removed according to the molten iron surface blast furnace quantity of slag; The sample examination molten steel sulfur content is also measured the temperature of molten iron; According to the content of remaining blast furnace slag in the back molten iron of skimming,, again molten iron is jetted again in the even crust block agent of throwing in 100 kilograms of molten iron face;
(2) molten iron is jetted after, allow it leave standstill 5 minutes, impel the desulfurization slag in the molten iron fully to float, following the earlier near back principle around then far away removes desulfurization slag, again according to the situation of desulfurization slag in the molten iron, evenly throw in 150 kilograms crust block agent at the molten iron face, and then carry out the operation that desulfurization slag removes;
(3) molten iron of handling through step (2) is carried out desulfurization slag once more and remove operation; Desulfurization slag for place, dead angle in the iron ladle, clockwise or rotate counterclockwise slag removal machine slag rake, stir the desulfurization top of the slag, make desulfurization slag be convenient to remove, rock iron ladle simultaneously, the desulfurization slag that stays around the iron ladle is concentrated to the center away from the position, dead angle, be convenient to remove, repeat the operation that desulfurization slag removes, the remaining desulfurization quantity of slag in molten iron reaches requirement, changes molten iron over to subsequent processing.
Embodiment two
The method of desulfurization slag in the described this removal molten iron may further comprise the steps:
(1) before after the DESULPHURIZATION OF HOT METAL BY POWDER INJECTION, removes blast furnace slag in the molten iron earlier, then winding-up with slag removal machine;
Select clean and the intact iron ladle of mouth for use; To entering the molten iron at desulfurization station,, follow the near earlier back principle around then far away and earlier blast furnace slag is removed according to the molten iron surface blast furnace quantity of slag; The sample examination molten steel sulfur content is also measured the temperature of molten iron; According to the content of remaining blast furnace slag in the back molten iron of skimming,, again molten iron is jetted again in the even crust block agent of throwing in 150 kilograms of molten iron face;
(2) molten iron is jetted after, allow it leave standstill 3 minutes, impel the desulfurization slag in the molten iron fully to float, following the earlier near back principle around then far away removes desulfurization slag, again according to the situation of desulfurization slag in the molten iron, evenly throw in 100 kilograms crust block agent at the molten iron face, and then carry out the operation that desulfurization slag removes;
(3) molten iron of handling through step (2) is carried out desulfurization slag once more and remove operation; Desulfurization slag for place, dead angle in the iron ladle, clockwise or rotate counterclockwise slag removal machine slag rake, stir the desulfurization top of the slag, make desulfurization slag be convenient to remove, rock iron ladle simultaneously, the desulfurization slag that stays around the iron ladle is concentrated to the center away from the position, dead angle, be convenient to remove, repeat the operation that desulfurization slag removes, the remaining desulfurization quantity of slag in molten iron reaches requirement, changes molten iron over to subsequent processing.
Embodiment three
The method of desulfurization slag in the described this removal molten iron may further comprise the steps:
(1) before the DESULPHURIZATION OF HOT METAL BY POWDER INJECTION, removes blast furnace slag in the molten iron earlier, then winding-up with slag removal machine; Select clean and the intact iron ladle of mouth for use; To entering the molten iron at desulfurization station,, follow the near earlier back principle around then far away and earlier blast furnace slag is removed according to the molten iron surface blast furnace quantity of slag; The sample examination molten steel sulfur content is also measured the temperature of molten iron; According to the content of remaining blast furnace slag in the back molten iron of skimming,, again molten iron is jetted again in the even crust block agent of throwing in 150 kilograms of molten iron face;
(2) molten iron is jetted after, allow it leave standstill 4 minutes, impel the desulfurization slag in the molten iron fully to float, following the earlier near back principle around then far away removes desulfurization slag, again according to the situation of desulfurization slag in the molten iron, evenly throw in the crust block agent of 120 kg at the molten iron face, and then carry out the operation that desulfurization slag removes;
(3) molten iron of handling through step (2) is carried out desulfurization slag once more and remove operation; Desulfurization slag for place, dead angle in the iron ladle, clockwise or rotate counterclockwise slag removal machine slag rake, stir the desulfurization top of the slag, make desulfurization slag be convenient to remove, rock iron ladle simultaneously, the desulfurization slag that stays around the iron ladle is concentrated to the center away from the position, dead angle, be convenient to remove, repeat the operation that desulfurization slag removes, the remaining desulfurization quantity of slag in molten iron reaches requirement, changes molten iron over to subsequent processing.
Among above embodiment one, embodiment two and the embodiment three, in order effectively to reduce iron loss, in described step (1), step (2) and the step (3), remove when operation carrying out desulfurization slag, when desulfurization slag arrives the iron ladle mouth, stopped for 5～10 seconds, and lift the slag rake, allow molten iron flow back to iron ladle, reduce the molten iron loss; Also the desulfurization slag that removes for the first time can be stayed a jar mouth, carry out secondary desulfurization slag then and remove operation, when the desulfurization slag that removes for the second time arrives jar mouth position, the desulfurization slag that removes is for the first time removed, allow the desulfurization slag that removes for the second time stay Guan Zui, repeat this operation, guarantee that the desulfurization slag that at every turn removes can stay for some time at the jar mouth, allow molten iron flow back to iron ladle, reduce the molten iron loss.
In described step (1) and the step (2), when the molten iron face is thrown in the crust block agent, when the crust block agent is deposited on the molten iron top of the slag, stir back and forth, make the crust block agent be evenly distributed on the molten iron surface with slag removal machine.
The composition of the crust block agent that is suitable in described step (1) and the step (2) contains Al2O3:6～15 weight parts, granularity≤5mm for containing SiO2:60～80 weight parts.
Among above embodiment one, embodiment two and the embodiment three, the method that earlier blast furnace slag in the iron ladle is removed winding-up is again compared with the method that present elder generation direct winding-up removes desulfurization slag again, under the same endpoint situation, the consumption of magnesium powder reduces 0.05-0.10Kg/t, the iron loss 3-5Kg/t that can descend, short 2-3 minute of time; After winding-up, molten iron is left standstill 3～5 minutes to impel desulfurization slag fully to float, carry out desulfurization slag more repeatedly and remove operation desulfurization slag is removed totally, the present invention can obviously reduce the sulphur rate of returning of converter.
By the removal method of desulfurization slag behind the suitable described desulfurizing iron, desulfurization degree obviously improves, and iron loss reduces, and the treatment time shortens, and temperature drop reduces, and the contrast before and after implementing is as follows:
Above the present invention has been carried out exemplary description; obviously specific implementation of the present invention is not subjected to the restriction of aforesaid way; as long as adopted the improvement of the various unsubstantialities that method of the present invention design and technical scheme carry out; or design of the present invention and technical scheme are directly applied to other occasion without improving, all within protection scope of the present invention.
Claims (4)
1. a method of removing desulfurization slag in the molten iron is characterized in that: may further comprise the steps;
(1) before the DESULPHURIZATION OF HOT METAL BY POWDER INJECTION, removes blast furnace slag in the molten iron earlier, then winding-up with slag removal machine;
Select clean and the intact iron ladle of mouth for use; To entering the molten iron at desulfurization station,, follow the near earlier back principle around then far away and earlier blast furnace slag is removed according to the molten iron surface blast furnace quantity of slag; The sample examination molten steel sulfur content is also measured the temperature of molten iron; According to the content of remaining blast furnace slag in the back molten iron of skimming,, again molten iron is jetted again in the even crust block agent of throwing in 100～150 kilograms of molten iron face;
(2) molten iron is jetted after, allow it leave standstill 3～5 minutes, impel the desulfurization slag in the molten iron fully to float, following the earlier near back principle around then far away removes desulfurization slag, again according to the situation of desulfurization slag in the molten iron, evenly throw in 100～150 kilograms crust block agent at the molten iron face, and then carry out the operation that desulfurization slag removes;
(3) molten iron of handling through step (2) is carried out desulfurization slag once more and remove operation; Desulfurization slag for place, dead angle in the iron ladle, clockwise or rotate counterclockwise slag removal machine slag rake, stir the desulfurization top of the slag, make desulfurization slag be convenient to remove, rock iron ladle simultaneously, the desulfurization slag that stays around the iron ladle is concentrated to the center away from the position, dead angle, be convenient to remove, repeat the operation that desulfurization slag removes, the remaining desulfurization quantity of slag in molten iron reaches requirement, changes molten iron over to subsequent processing.
2. according to the method for desulfurization slag in the described removal molten iron of claim 1, it is characterized in that: in described step (1), step (2) and the step (3), when desulfurization slag removes, when desulfurization slag arrives the iron ladle mouth, stopped for 5～10 seconds, and lift the slag rake, allow molten iron flow back to iron ladle.
3. according to the method for desulfurization slag in claim 1 or the 2 described removal molten iron, it is characterized in that: in described step (1) and the step (2), when the molten iron face is thrown in the crust block agent, stir back and forth, make the crust block agent be evenly distributed on the molten iron surface with slag removal machine slag rake.
4. according to the method for desulfurization slag in the described removal molten iron of claim 3, it is characterized in that: the composition of the crust block agent that is suitable in described step (1) and the step (2) contains Al2O3:6～15 weight parts, granularity≤5mm for containing SiO2:60～80 weight parts.
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| CN2011101138778A CN102206726A (en) | 2011-05-04 | 2011-05-04 | Method for removing desulfurizing slag from molten iron |
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| CN2011101138778A CN102206726A (en) | 2011-05-04 | 2011-05-04 | Method for removing desulfurizing slag from molten iron |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103114175A (en) * | 2013-03-19 | 2013-05-22 | 武汉钢铁(集团)公司 | Deep desulfuration method for magnesium-based composite jetted molten iron |
| CN105087867A (en) * | 2015-06-23 | 2015-11-25 | 河北钢铁股份有限公司承德分公司 | Method for preventing resulfurization of molten iron desulfurized through single blow grain magnesium |
| CN111154944A (en) * | 2019-10-29 | 2020-05-15 | 攀钢集团西昌钢钒有限公司 | Device and method for recovering vanadium slag through desulfurization |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103114175A (en) * | 2013-03-19 | 2013-05-22 | 武汉钢铁(集团)公司 | Deep desulfuration method for magnesium-based composite jetted molten iron |
| CN103114175B (en) * | 2013-03-19 | 2015-02-25 | 武汉钢铁(集团)公司 | Deep desulfuration method for magnesium-based composite jetted molten iron |
| CN105087867A (en) * | 2015-06-23 | 2015-11-25 | 河北钢铁股份有限公司承德分公司 | Method for preventing resulfurization of molten iron desulfurized through single blow grain magnesium |
| CN105087867B (en) * | 2015-06-23 | 2017-05-17 | 河北钢铁股份有限公司承德分公司 | Method for preventing resulfurization of molten iron desulfurized through single blow grain magnesium |
| CN111154944A (en) * | 2019-10-29 | 2020-05-15 | 攀钢集团西昌钢钒有限公司 | Device and method for recovering vanadium slag through desulfurization |
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Application publication date: 20111005 |