CN102719616A - Molten iron desulfurizing method and desulfurizing device thereof - Google Patents
Molten iron desulfurizing method and desulfurizing device thereof Download PDFInfo
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- CN102719616A CN102719616A CN201210213411XA CN201210213411A CN102719616A CN 102719616 A CN102719616 A CN 102719616A CN 201210213411X A CN201210213411X A CN 201210213411XA CN 201210213411 A CN201210213411 A CN 201210213411A CN 102719616 A CN102719616 A CN 102719616A
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Abstract
The invention relates to a molten iron desulfurizing method and a desulfurizing device thereof. The molten iron desulfurizing method includes pouring processing molten iron into an inner cavity of a desulfurizing device; adding a lime and fluorite compound desulfurizer constantly; blowing argon to stir the molten iron through an air inlet of the desulfurizing device, and removing sulfur in the molten iron; and discharging desulfurizing slag constantly from a slag discharging groove, and discharging the desulfurized molten iron through an iron discharging nozzle, wherein the S content in the desulfurized molten iron is 0.041 to 0.057. The desulfurizing device is provided with a tank casing with trunnion iron, and is characterized in that the iron discharging nozzle which inclines upward is arranged on the tank casing, the slag discharging groove which inclines from top to down is arranged at a position opposite to the iron discharging nozzle, fireproofing linings are arranged in the tank casing, the iron discharging nozzle and the slag discharging groove, an air inlet is arranged at the bottom, and the slag discharging groove at the upper end of the slag discharging groove is higher or 20cm higher than the front end of the iron discharging nozzle. According to the molten iron desulfurizing method and the desulfurizing device thereof, molten iron desulfurizing efficiency is improved, and the amount of the desulfurized molten iron can reach 15-25t/h.
Description
Technical field
The present invention relates to a kind of desulfurizing iron method and desulfurizer thereof.
Background technology
When the shaft furnace smelting device was produced molten iron, tapping a blast furnace was to adopt the long stream mode of molten iron, and because shaft furnace is handled the discarded iron-containing resource of iron and steel, sulfur content of hot metal can not directly supply steel-making to use up to 0.1%-0.3%.Therefore, must carry out pretreatment desulfurizing to high-sulphur molten iron.Can not be used for the on-line continuous desulfurization with existing pre-treatment jar, existing sulfur method desulfurization is sprayed molten iron and is added sweetening agent and utilize mechanical stirring to realize desulfurizing iron in the pre-treatment jar, can not the on-line continuous desulfurization; Be to go out a part of iron after the desulfurization, add sweetening agent after slagging tap again and go out a part of iron again, and spray when adding the sweetening agent desulfurization; The excessive slag of hot metal pretreatment jar is serious; Reduced pre-treatment jar useful volume, the shaft furnace desulfurizing iron time is long, and sorbent consumption is big; And the mechanical stirring device that adopts is prone to loss, and desulphurization cost is high.
Summary of the invention
In order to overcome the above-mentioned deficiency of existing desulfurizing iron method; The desulfurizing iron method that the present invention provides a kind of molten iron to flow out the on-line continuous desulfurization continuously; Improve desulfurizing iron efficient, the desulphurised hot metal amount is 15～25t/h, provides a kind of this method used desulfurizer simultaneously.
This desulfurizing iron method is:
IContinuously flow in the inner chamber of desulfurizer handling molten iron, the mass percent of the C in the molten iron, P, S and Si is:
C 3.8～4.2；?P 0.050～0.068；S?0.11～0.28；Si?1.03～2.15；
Temperature is 1427～1455 ℃; The flow of molten iron is 200～350kg/min;
IIConstantly add lime and fluorite composite desulfurizing agent simultaneously, the sweetening agent of adding and the mass ratio of molten iron are 15～30kg/t molten iron;
IIIAnd the air inlet port by the desulfurizer bottom is blown into argon gas stirring molten iron, and the flow of argon gas is 0.10～0.15Nm
3/ (tmin); Molten iron and sweetening agent are fully reacted, remove sulphur in the molten iron;
IVDischarge desulfurization slag continuously by ash shoot, by the molten iron that goes out after embolum goes out desulfurization continuously; The mass percent of C, P, S and Si is in the molten iron after the desulfurization:
C 3.7～4.1；?P 0.049～0.067；S?0.041～0.057；Si?0.80～1.02；
Temperature is 1385～1401 ℃.
This desulfurizing iron method
IHandle in the inner chamber that molten iron continuously flows into desulfurizer,
IIAdd lime and fluorite composite desulfurizing agent and
IIIBeing blown into argon gas stirring molten iron carries out simultaneously.
The volume of desulfurizer is 1.2 ± 0.2m as one
3, handling weight of molten iron is 160 tons.
This desulfurizer comprises the pre-treatment jar; The pre-treatment jar has a ladle bowl with gudgeon iron; It is characterized in that: have one upsweptly to go out embolum at ladle bowl, an oblique from the top down ash shoot arranged going out the relative position of embolum, ladle bowl with go out in embolum and the ash shoot refractory lining is arranged; At the pre-treatment pot bottom air inlet port is arranged, higher 20 centimetres or be higher than 20 centimetres at the ash shoot slag inlet of ash shoot upper end than the front end that goes out embolum.Use embolum under the scum interface.
Above-mentioned desulfurizer is characterized in that: the diameter of the inner chamber of pre-treatment jar is 0.96 ± 0.1 meter, dark 2.0 ± 0.2 meters, and 1.45 ± 0.2 cubic metres of volumes.
Desulfurizer of the present invention is on the pre-treatment jar, to have one upsweptly to go out embolum, an oblique from the top down ash shoot is arranged going out the relative position of embolum, and in the bottom air inlet port is arranged.
This desulfurizing iron method will be handled molten iron and continuously flow into desulfurizer; Composite desulfurizing agent simultaneously, and be blown into argon gas by the air inlet port of pre-treatment pot bottom and stir molten iron, discharge desulfurization slag continuously by ash shoot; By the molten iron that goes out after embolum goes out desulfurization continuously; Improved desulfurizing iron efficient, the desulphurised hot metal amount reaches 15～25t/h, has reduced the desulfurizing iron cost.Desulfurizer of the present invention can be realized the desulfurization in the process of tapping a blast furnace of continuous molten iron.Desulfurizer is a refractory lining.Go out embolum under the scum interface, and gas permeable brick is installed, strengthen the molten iron mixing effect, improve desulphurization reaction efficient in bottom of device.
Description of drawings
Fig. 1 is the front view of desulfurizer of the present invention.
Fig. 2 is and the corresponding vertical view of Fig. 1.
Fig. 3 is the sectional view along A among Fig. 2-A line.
Among the above-mentioned figure:
1-go out embolum, 2-ladle bowl, 3-pre-treatment jar, 4-ash shoot, 5-gudgeon, 6-air inlet port, 7-ash shoot slag inlet, 8-inner chamber, 9-refractory lining.
Embodiment
Specify embodiment of the present invention below in conjunction with embodiment and accompanying drawing thereof, but embodiment of the present invention is not limited to following embodiment.
Sulfur method embodiment
Present embodiment carries out in desulfurizer of the present invention, and the volume of pre-treatment jar is 1.45m
3Handling weight of molten iron is 160 tons, and the mass percent of the C in the molten iron, P, S and Si is:
C 4.0; P 0.060; S 0.24; Si 1.60; Temperature is 1438 ℃.
The desulfurizing iron method of present embodiment is that molten iron is continuously flowed in the inner chamber 9 of pre-treatment jar 3 of desulfurizer, and the flow of molten iron is 2750kg/min, constantly adds lime and fluorite composite desulfurizing agent, the sweetening agent 22kg/t molten iron of molten iron adding per ton simultaneously; And the air inlet port 6 by pre-treatment jar 3 bottoms is blown into argon gas stirring molten iron, and the flow of argon gas is 0.12Nm
3/ (tmin); Molten iron and sweetening agent are fully reacted, remove sulphur in the molten iron.Discharge desulfurization slag continuously by ash shoot 4, by the molten iron that goes out after embolum 1 goes out desulfurization continuously.Thereby realize the purpose of continuous desulfurization of molten iron.
The mass percent of C, P, S and Si is in the molten iron after the desulfurization:
C 3.9；?P 0.058；S?0.050；Si?0.90；
Temperature is 1393 ℃.
Desulfurizer embodiment
The structure of present embodiment is seen Fig. 1, Fig. 2 and Fig. 3; It has a pre-treatment jar 3, and pre-treatment canned 3 has the ladle bowl 2 with gudgeon 5 iron, has one upsweptly to go out embolum 2 at ladle bowl 2; An oblique from the top down ash shoot 4 is arranged going out embolum 2 relative positions; Ladle bowl 2 with go out in embolum 1 and the ash shoot 4 refractory lining 9 is arranged, in the bottom of pre-treatment jar 3 air inlet port 6 is arranged, higher 20 centimetres at the ash shoot slag inlet 7 of ash shoot 4 upper ends than the front end that goes out embolum 1.Use embolum 2 under the scum interface.
The diameter of the inner chamber 9 of present embodiment is 0.96 meter, dark 2.0 meters.1.45 cubic metres of volumes.
Claims (3)
1. desulfurizing iron method, it is:
IContinuously flow in the inner chamber of desulfurizer handling molten iron, the mass percent of the C in the molten iron, P, S and Si is:
C 3.8～4.2；?P 0.050～0.068；S?0.11～0.28；Si?1.03～2.15；
Temperature is 1427～1455 ℃; The flow of molten iron is 200～350kg/min;
IIConstantly add lime and fluorite composite desulfurizing agent simultaneously, the sweetening agent of adding and the mass ratio of molten iron are 15～30kg/t molten iron;
IIIAnd the air inlet port by the desulfurizer bottom is blown into argon gas stirring molten iron, and the flow of argon gas is 0.10～0.15Nm
3/ (tmin); Molten iron and sweetening agent are fully reacted, remove sulphur in the molten iron;
IVDischarge desulfurization slag continuously by the slag chute that goes out desulfurizer, by the molten iron that goes out after embolum goes out desulfurization continuously; The mass percent of C, P, S and Si is in the molten iron after the desulfurization:
C 3.7～4.1；?P 0.049～0.067；S?0.041～0.057；Si?0.80～1.02；
Temperature is 1385～1401 ℃.
2. desulfurizer; It comprises pretreatment unit, and pretreatment unit has a ladle bowl with gudgeon iron, has one upsweptly to go out embolum at ladle bowl; It is characterized in that: an oblique from the top down ash shoot is arranged going out the relative position of embolum; Ladle bowl with go out in embolum and the ash shoot refractory lining is arranged, in the bottom air inlet port is arranged, higher 20 centimetres or be higher than 20 centimetres at the ash shoot slag inlet of ash shoot upper end than the front end that goes out embolum.
3. desulfurizer according to claim 2 is characterized in that: the diameter of its inner chamber is 0.96 ± 0.1 meter, dark 2.0 ± 0.2 meters, and 1.45 ± 0.2 cubic metres of volumes.
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| CN201210213411XA CN102719616A (en) | 2012-06-27 | 2012-06-27 | Molten iron desulfurizing method and desulfurizing device thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105268538A (en) * | 2014-07-21 | 2016-01-27 | 刘世云 | Water-power ore separator |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2463393Y (en) * | 2001-02-27 | 2001-12-05 | 郑州大学 | Molten iron preprocessing unit |
| CN1435495A (en) * | 2002-11-27 | 2003-08-13 | 盛富春 | Method for pretreating blast furnace melted iron to desiliconize |
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- 2012-06-27 CN CN201210213411XA patent/CN102719616A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2463393Y (en) * | 2001-02-27 | 2001-12-05 | 郑州大学 | Molten iron preprocessing unit |
| CN1435495A (en) * | 2002-11-27 | 2003-08-13 | 盛富春 | Method for pretreating blast furnace melted iron to desiliconize |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105268538A (en) * | 2014-07-21 | 2016-01-27 | 刘世云 | Water-power ore separator |
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Application publication date: 20121010 |