CN102732669B - Auxiliary device for removal of dephosphorization residues in converter, and method for auxiliary removal of dephosphorization residues through air blowing - Google Patents
Auxiliary device for removal of dephosphorization residues in converter, and method for auxiliary removal of dephosphorization residues through air blowing Download PDFInfo
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- CN102732669B CN102732669B CN201210206880.9A CN201210206880A CN102732669B CN 102732669 B CN102732669 B CN 102732669B CN 201210206880 A CN201210206880 A CN 201210206880A CN 102732669 B CN102732669 B CN 102732669B
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- converter
- feed port
- air feed
- slag
- dephosphorization
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- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
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Abstract
The invention provides an auxiliary device for the removal of dephosphorization residues in a converter, and a method for the auxiliary removal of the dephosphorization residues through air blowing. The auxiliary device for the removal of the dephosphorization residues in the converter of the invention comprises an air supply opening at the residue discharge side of the converter, and the horizontal position of the air supply opening is lower than the horizontal position of the steel outlet of the converter. The auxiliary device for the removal of the dephosphorization residues in the converter of the invention has the advantages of rapid and effective removal of the high phosphorous residues, dephosphorization efficiency improvement, end point [P] content reduction, molten iron temperature improvement, and production cost reduction.
Description
Technical field
The invention belongs to technical field of ferrous metallurgy, relate to a kind of converter except supplementary unit and a kind of auxiliary method except dephosphorized slag of blowing of dephosphorized slag.
Background technology
In order to adapt to the expansion of global energy needs, in recent years, the produced quantity of the lower resource in the sea such as oil, Sweet natural gas is increasing, and with it under corresponding sea environment more and more severe, corrodibility is strengthened.This just requires the equipment of the lower operation in sea except having high strength, also will have certain erosion resistance.In order to meet the service requirements of steel for the lower implement in sea, the Low-phosphorus Steel even high-cleanness, high of ultra-low phosphoretic steel, ultralow-sulfur steel is very important, and process for making process is to control the key point of the cleanliness factor of steel.
Dephosphorization of molten iron is processed according to container used different, and dephosphorization of molten iron can be divided into two classes: a kind of is in hot metal ladle or torpedo car, to carry out liquid iron pretreatment dephosphorizing, and another kind is in converter, to carry out dephosphorization.In converter steelmaking is produced, in Converter, the problem of dephosphorization is subject to showing great attention to of each steelworks always.The method generally adopting at present has: single slag process, double slag process, duplex practice etc.When phosphorus content in molten iron ([P]) surpasses 0.12%, it is just more difficult that employing single slag process carries out dephosphorization; In the situation that molten iron phosphorus content surpasses 0.12%, [Si] in molten iron reached 0.5% and when above, can increase the difficulty of converter dephosphorization.Therefore,, by analyzing and researching on affecting the factor of converter dephosphorization, adopt double slag process operation to obtain good dephosphorization effect.So-called double slag process (that is, secondary slag practice) refers to: stove is fallen in converter during to 8～12min in initial smelting period blowing, emit a part of high phosphorus slag, then continues blowing slag-making again, and then further dephosphorization falls stove, catch carbon, and point blows, tapping.Therefore, how to remove quickly and efficiently the key point that high phosphorus slag is double slag process technique, can directly have influence on final dephosphorization effect.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, the supplementary unit of a kind of converter except dephosphorized slag is provided.
The present invention also provides a kind of method of utilizing supplementary unit that converter removes dephosphorized slag to carry out deslagging by gas blow.
The object of the invention is to remove quickly and efficiently high phosphorus slag, reduce the consumption of dephosphorizing agent, improve dephosphorization efficiency and molten iron temperature, reduce terminal [P] content.
For above-mentioned purpose, an aspect of of the present present invention provides the supplementary unit of a kind of converter except dephosphorized slag, described converter comprises the air feed port of the tapping side that is arranged on converter except the supplementary unit of dephosphorized slag, and the level attitude of described air feed port is lower than the level attitude of the tap hole of converter.
According to an aspect of the present invention, the level attitude of described air feed port is 1m left and right on molten iron level, is beneficial to liberated heat and is absorbed.
According to an aspect of the present invention, described converter also comprises supply oxygen or the storing device of high pressure gas and the reversing system of gas circuit being connected with air feed port except the supplementary unit of dephosphorized slag.
A kind of auxiliary method except dephosphorized slag of blowing is provided according to a further aspect in the invention, described method comprises: by the tapping side in converter, level attitude is installed lower than the air feed port of the level attitude of the tap hole of converter, make when converter is vertically made steel, by described air feed port, be blown into oxygen, thereby react with the CO emitting in molten iron and carry out secondary combustion and emit heat by the oxygen being blown into.
According to a further aspect in the invention, described method also comprises: when slagging is toppled in converter, by described air feed port, emit high pressure gas, high phosphorus slag is rejected to outside converter with the fluctuation of liquid steel level.
Supplementary unit according to converter of the present invention except dephosphorized slag, can remove high phosphorus slag quickly and efficiently, improves dephosphorization efficiency, reduces terminal [P] content.In addition, the supplementary unit according to converter of the present invention except dephosphorized slag, can also reduce rephosphorization amount, reduces the consumption of dephosphorizing agent.In addition, the supplementary unit according to converter of the present invention except dephosphorized slag, can also improve molten iron temperature, reduces production costs.
Accompanying drawing explanation
Fig. 1 shows according to converter of the present invention except the supplementary unit of the dephosphorized slag schematic diagram when converter is vertically made steel.
Fig. 2 shows according to converter of the present invention except the supplementary unit of the dephosphorized slag schematic diagram when converter is tilted except high phosphorus slag.
Embodiment
In order to remove quickly and efficiently high phosphorus slag, reduce the consumption of dephosphorizing agent, improve dephosphorization efficiency and molten iron temperature, reduce terminal [P] content, the invention provides a kind of supplementary unit of converter dephosphorization slag.
According to the present invention, the supplementary unit of converter dephosphorization slag comprises the air feed port of the tapping side that is arranged on converter, and the level attitude of air feed port is lower than the level attitude of the tap hole of converter.According to one embodiment of present invention, the location optimization of air feed port ground is 1m left and right on molten iron level, be beneficial to liberated heat and be absorbed, and when converter tipping falls high phosphorus slag, air feed port is more close to the bottom of converter.According to the present invention, the shape of air feed port is not done to concrete restriction, as long as it meets aforementioned requirement.According to the supplementary unit of converter dephosphorization slag of the present invention, also can comprise the reversing system that is arranged on the supply oxygen being connected with air feed port of converter outside or the storing device (not shown) of high pressure gas and is arranged on the gas circuit of converter outside.
Therefore, according to the present invention, by the tapping side in converter, air feed port is installed, when slagging is toppled in converter, by air feed port, emit high pressure gas (air or oxygen all can), form huge bubble in molten steel, bubble constantly rises, and finally cause the fluctuation of liquid steel level, now high phosphorus slag is excluded outside converter with the fluctuation of liquid level.When converter is vertically made steel, by blowing (or soft blow) oxygen a little less than air feed port, react with the CO emitting in molten iron, carry out secondary combustion and emit heat, thereby can improve molten iron temperature.According to the present invention, in when steel-making, by air feed port soft blow oxygen, when slagging, by air feed port, emit high pressure gas (for example, being air or oxygen), therefore, can switch steel-making operation and slagging operates by reversing valve.According to one embodiment of present invention, can when slagging, by air feed port, emit high-pressure air, to reduce costs.
In order to explain better the present invention, below in conjunction with accompanying drawing, the present invention will be further described, but the invention is not restricted to this.
Fig. 1 shows according to converter of the present invention except the supplementary unit of the dephosphorized slag schematic diagram when converter is vertically made steel.Fig. 2 shows according to converter of the present invention except the supplementary unit of the dephosphorized slag schematic diagram when converter is tilted except high phosphorus slag.
As shown in Figure 1, according to converter of the present invention, comprise the air feed port 1 of the tapping side that is arranged on converter except the supplementary unit of dephosphorized slag, tap hole 2 will be higher than the position of air feed port.When converter is vertically made steel, by air feed port 1 soft blow oxygen, the oxygen being blown into is reacted with the CO emitting in molten iron, thereby emit heat by secondary combustion, improve molten iron temperature.It will be understood by those skilled in the art that " soft blow " here refers to that oxygen lance blow head is far away apart from liquid level in oxygen top blown converter steel making process, Oxygen Flow is less to the surging force of liquid level, it is more shallow that oxygen jet penetrates molten bath, and contact area is larger, therefore be called " soft blow ".
When slagging is toppled in converter, as shown in Figure 2, by air feed port 1, (for example emit high pressure gas, air or oxygen), form huge bubble in molten steel, bubble constantly rises, and finally cause the fluctuation of liquid steel level, now high phosphorus slag is rejected to outside converter with the fluctuation of liquid level.Therefore, the supplementary unit by converter of the present invention except dephosphorized slag, can remove high phosphorus slag quickly and efficiently, improves dephosphorization efficiency, reduces terminal [P] content; In addition, can also reduce rephosphorization amount, reduce the consumption of dephosphorizing agent.
Therefore, according to the present invention, in steelmaking process, when slagging-off or catch carbon, converter is tumbled to air feed port side, during tapping, to tap hole side, tumbles, and can tumble front and back.Therefore, according to converter of the present invention, the supplementary unit tool except dephosphorized slag has the following advantages:
(1) by air feed port, provide high pressure gas, form bubble in molten steel, this bubble can promote the floating of inclusion, main is the fluctuation that causes liquid steel level, thereby can remove quickly and efficiently high phosphorus slag, improve dephosphorization efficiency, reduce terminal [P] content.
(2), due to advantage above-mentioned, so can remove more high phosphorus slag, prevent the generation of rephosphorization, so effectively lowered the use of dephosphorizing agent for the second time.The method comparing class is similar to washes clothes, and when washing first pass, laundry water is outwelled, and while washing for the second time, only need add a small amount of washing powder.Therefore, the supplementary unit that removes dephosphorized slag according to converter of the present invention can reduce rephosphorization amount, reduces the consumption of dephosphorizing agent.
(3) can improve molten iron temperature, thereby reduce production cost.
Although specifically illustrate and described the present invention with reference to exemplary embodiment of the present invention, but it should be understood by one skilled in the art that, in the situation that do not depart from the spirit and scope of the present invention that limited by claim and equivalent thereof, can make the change in various forms and details at this.
Claims (4)
1. a converter is except the supplementary unit of dephosphorized slag, it is characterized in that: the supplementary unit that described converter removes dephosphorized slag comprises an air feed port that is arranged on the tapping side of converter, the level attitude of described air feed port is lower than the level attitude of the tap hole of converter, wherein, the position of the level attitude of described air feed port 1m on molten iron level, wherein, when converter is vertically made steel, by described air feed port, be blown into oxygen, thereby react with the CO emitting in molten iron and carry out secondary combustion and emit heat by the oxygen being blown into.
2. converter according to claim 1 is except the supplementary unit of dephosphorized slag, it is characterized in that described converter also comprises supply oxygen or the storing device of high pressure gas and the reversing system of gas circuit being connected with air feed port except the supplementary unit of dephosphorized slag.
3. the method except dephosphorized slag is assisted in an air blowing, it is characterized in that described method comprises: by the tapping side in converter, a level attitude is installed lower than the air feed port of the level attitude of the tap hole of converter, make when converter is vertically made steel, by described air feed port, be blown into oxygen, thereby react with the CO emitting in molten iron and carry out secondary combustion and emit heat by the oxygen being blown into
Wherein, the position of the level attitude of described air feed port 1m on molten iron level.
4. the auxiliary method except dephosphorized slag of air blowing according to claim 3, is characterized in that described method also comprises: when slagging is toppled in converter, by described air feed port, emit high pressure gas, high phosphorus slag is rejected to outside converter with the fluctuation of liquid steel level.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210206880.9A CN102732669B (en) | 2012-06-21 | 2012-06-21 | Auxiliary device for removal of dephosphorization residues in converter, and method for auxiliary removal of dephosphorization residues through air blowing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210206880.9A CN102732669B (en) | 2012-06-21 | 2012-06-21 | Auxiliary device for removal of dephosphorization residues in converter, and method for auxiliary removal of dephosphorization residues through air blowing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102732669A CN102732669A (en) | 2012-10-17 |
| CN102732669B true CN102732669B (en) | 2014-11-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210206880.9A Expired - Fee Related CN102732669B (en) | 2012-06-21 | 2012-06-21 | Auxiliary device for removal of dephosphorization residues in converter, and method for auxiliary removal of dephosphorization residues through air blowing |
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| CN (1) | CN102732669B (en) |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5959820A (en) * | 1982-09-30 | 1984-04-05 | Sumitomo Metal Ind Ltd | Metal refining furnace and its operating method |
| JPH04350109A (en) * | 1991-05-28 | 1992-12-04 | Nippon Steel Corp | Method for removing slag |
| JPH08291311A (en) * | 1995-04-19 | 1996-11-05 | Nippon Steel Corp | Steel scrap melting method excellent in heat conductive efficiency |
| JPH08295915A (en) * | 1995-04-27 | 1996-11-12 | Nippon Steel Corp | Method for melting steel scrap utilizing granular iron |
| CN2229930Y (en) * | 1995-06-30 | 1996-06-26 | 唐山钢铁股份有限公司 | Oxygen side blown converter |
| JPH09176719A (en) * | 1995-12-26 | 1997-07-08 | Sumitomo Metal Ind Ltd | Converter and blowing operation |
| CN101338349A (en) * | 2007-07-03 | 2009-01-07 | 东北大学 | Converter steelmaking process by top, bottom and side blowing |
| CN202688358U (en) * | 2012-06-21 | 2013-01-23 | 莱芜钢铁集团有限公司 | Auxiliary device of converter for removing phosphorus slag |
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2012
- 2012-06-21 CN CN201210206880.9A patent/CN102732669B/en not_active Expired - Fee Related
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| CN102732669A (en) | 2012-10-17 |
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Granted publication date: 20141112 Termination date: 20180621 |