CN101693940A - Utilizing method of waste slag of vacuum degassing refining furnace - Google Patents
Utilizing method of waste slag of vacuum degassing refining furnace Download PDFInfo
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- CN101693940A CN101693940A CN200910075677A CN200910075677A CN101693940A CN 101693940 A CN101693940 A CN 101693940A CN 200910075677 A CN200910075677 A CN 200910075677A CN 200910075677 A CN200910075677 A CN 200910075677A CN 101693940 A CN101693940 A CN 101693940A
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- molten iron
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- rhombspar
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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Abstract
The invention relates to a utilizing method of waste slag of a vacuum degassing refining furnace, which sequentially comprises the following steps: 1, adding 22-26kg of waste slag per ton of molten iron of the vacuum degassing refining furnace into a pig-iron ladle, blowing oxygen after connecting the pig-iron ladle with the molten iron; adding lime and dolomite after blowing and igniting for oxygen blowing and smelting, adding 22-26kg of waste slag per molten iron of the vacuum degassing refining furnace when blowing and melting for 4-6min; when blowing and melting for 8-12min, adding the lime and the dolomite; when blowing and melting for 16-24min, stopping the oxygen blowing; discharging iron when the temperature of the molten iron is not less than 1600 DEG C and the mass percentage ratio of C, Si, P and S reaches the requirement; and 2, adding the treated molten iron into an electric furnace for melting. The utilizing method of the waste slag of the vacuum degassing refining furnace enables the waste slag of the vacuum degassing refining furnace to be used in a process of slagging of a molten iron pre-treatment furnace and the electric furnace, thereby saving the slagging materials, realizing recycle of the waste slag and lowering the consumption of steel per ton.
Description
Technical field
The present invention relates to a kind of method of utilizing of waste slag of vacuum degassing refining furnace, promptly VD stove waste residue utilizes method.
Background technology
In the vacuum degassing refining furnace vacuum, owing to the slag phenomenon of overflowing often occurs, the slag that overflows becomes waste residue and outwells or pave the way.Like this waste slag of vacuum degassing refining furnace utilize effect too low, both wasted raw material, caused environmental pollution again.Through assay, in waste residue, find to contain many available materials.
Summary of the invention
In order to overcome the above-mentioned deficiency of utilizing method of existing waste slag of vacuum degassing refining furnace, the invention provides a kind of method of utilizing with the high waste slag of vacuum degassing refining furnace of effect.
The applicant has found to contain a large amount of CaO, Al through assay in waste residue
2O
3, SiO
2VD stove waste residue is used for the slagging process of hot metal pretreatment stove, electric furnace, utilizes wherein CaO, Al
2O
3, SiO
2Carry out slag making.Save the slag making materials of hot metal pretreatment stove, electric furnace, realized that waste residue recycles, protected environment.
The quality per distribution ratio of waste slag of vacuum degassing refining furnace chemical ingredients sees Table 1
Table 1
| ??FeO | ??SiO 2 | ??Al 2O 3 | ??CaO | ??MnO | ??MgO | ??S | ??P 2O 5 |
| ??0.82??-1.15 | ??11.36??-13.94 | ??14.98??-15.27 | ??57.67??-60.34 | ??0.18??-0.43 | ??4.12??-4.83 | ??0.545??-0.674 | ??0.011??-0.013 |
Cooled waste slag of vacuum degassing refining furnace is broken into the cake mass of 5-50mm, is recovered to high hopper, in the slagging process of hot metal pretreatment stove, electric furnace, use, reach the purpose of saving lime, rhombspar.
The method of utilizing of this waste slag of vacuum degassing refining furnace comprises following sequential steps:
The blocky waste slag of vacuum degassing refining furnace that I will be broken into 5-50mm earlier adds in the iron ladle, molten iron per ton adds waste residue 22-26kg, with iron ladle open connect molten iron to the hot metal mixer station after, enter the blowing station and descend the rifle oxygen blast, C, Si, the quality per distribution ratio of P, S and the requirement that temperature reaches table 2 in the molten iron before the pre-treatment:
Table 2
| Composition | ??C％ | ??Si％ | ??P％ | ??S％ | Temperature |
| Before the pre-treatment | ??3.76-4.20 | ??0.57-1.00 | ??≤0.072 | ??≤0.070 | ??≥1200℃ |
Add lime, rhombspar again after the blowing igniting, molten iron per ton adds lime 14-18kg, rhombspar 2-6kg.Pressure with 0.6-0.78MPa carries out the oxygen blast smelting.Blow 4-6 minute the time, look the reaction in furnace situation, add waste slag of vacuum degassing refining furnace again, molten iron per ton adds waste residue 22-26kg, blow 8-12 minute the time adding lime, rhombspar.It is 22-26kg, rhombspar 2-6kg that molten iron per ton adds amount of lime.Blowing promptly stopped oxygen blast in 16-24 minute, and thermometric, got the slag specimen analysis.Tap a blast furnace when the quality per distribution ratio of C, Si, P and S reaches following the requirement in the molten iron: C 2.50-3.10% Si 0.20-0.26% P≤0.036% S≤0.050% in molten iron temperature 〉=1600 ℃;
II is blended into the molten iron that disposes in the electric furnace and smelts.
The method that above-mentioned waste slag of vacuum degassing refining furnace is recycled in the smelting process of electric furnace, after cold burden, molten iron have all been adorned, begins to carry out oxygen blast with the fire door water cooled oxygen lance, send the electricity operation simultaneously.After forming the molten bath in the stove, add waste slag of vacuum degassing refining furnace, lime and rhombspar in three batches altogether by high hopper in stove and carry out the slag making operation, the add-on of molten steel per ton is respectively waste residue 18-22kg, lime 18-22kg, rhombspar 3-7kg.Temperature in the stove 〉=1540 ℃ is got material molten steel is analyzed.According to the composition analysis result, continuing to send electricity, oxygen blown while in stove, to add lime and rhombspar, the add-on of molten iron per ton is respectively lime 8-12kg, rhombspar 1-3kg.When molten steel composition, temperature reach the requirement of branch steel grade, can tap.
The method that above-mentioned waste slag of vacuum degassing refining furnace utilizes is characterized in that:
When I added iron ladle with the blocky waste slag of vacuum degassing refining furnace of 5-50mm, molten iron per ton added waste residue 24kg; When adding lime, rhombspar again after the blowing igniting, molten iron per ton adds lime 16kg, rhombspar 4kg.Pressure with 0.69MPa carries out the oxygen blast smelting.Blow 5 minutes the time, look the reaction in furnace situation, add waste slag of vacuum degassing refining furnace again, molten iron per ton adds waste residue 24kg, blow 10 minutes the time adding lime, rhombspar.It is 24kg, rhombspar 4kg that molten iron per ton adds amount of lime.Blow and promptly stopped oxygen blast in 20 minutes;
After forming the molten bath in the II stove, add waste slag of vacuum degassing refining furnace, lime and rhombspar in three batches altogether by high hopper in stove and carry out the slag making operation, the add-on of molten steel per ton is respectively waste residue 20kg, lime 20kg, rhombspar 5kg.Continuing to send electricity, oxygen blown while to add lime and rhombspar in stove, the add-on of molten iron per ton is respectively lime 10kg, rhombspar 2kg.
The method that this waste slag of vacuum degassing refining furnace is recycled is used for the slagging process of hot metal pretreatment stove, electric furnace with waste slag of vacuum degassing refining furnace, can save slag making materials, realizes the recycling of waste residue, thereby has protected environment.Can reduce loss per ton steel, general molten iron per ton reduces lime 12kg/t, rhombspar 24kg/t.Reduced the cost of steel-making.
Embodiment
Describe the embodiment of utilizing method of this waste slag of vacuum degassing refining furnace in detail below in conjunction with embodiment, but the embodiment of utilizing method of this waste slag of vacuum degassing refining furnace is not limited to following embodiment.
Embodiment one
Present embodiment is with 1.2 tons of cooled waste slag of vacuum degassing refining furnace, is broken into the cake mass of 5-50mm.Be recovered to high hopper, in the slagging process of hot metal pretreatment stove, use.
The steps include:
The block waste slag of vacuum degassing refining furnace 600kg that I will be broken into 5mm-50mm earlier adds in the iron ladle, with iron ladle open connect 25 tons of molten iron to the hot metal mixer station after, enter the blowing station and descend the rifle oxygen blast.The temperature of molten iron is 1200 ℃, and the quality per distribution ratio of contained C, Si, P and S is in the molten iron:
C??3.76％??Si??0.57％??P?0.072％??S?0.014％
Promptly add lime 400Kg, rhombspar 100kg after the igniting.Pressure with P=0.69MPa blows.Blow 5 minutes the time, look the reaction in furnace situation, add vacuum degassing refining furnace slag 600Kg again.
Blow and add lime 600Kg, rhombspar 100kg 10 minutes the time.Blowing promptly stopped oxygen blast in 20 minutes, and thermometric, got the slag specimen analysis.The temperature of molten iron reaches 1600 ℃, and the quality per distribution ratio of C, Si, P and S reaches following requirement and taps a blast furnace in the molten iron:
C??3.104％??Si??0.26％??P?0.036％??S??0.015％；
II is blended into the molten iron that disposes in the electric furnace.
Present embodiment after cold burden, molten iron have all been adorned, begins to carry out oxygen blast with the fire door water cooled oxygen lance in the smelting process of electric furnace, send the electricity operation simultaneously.After forming the molten bath in the stove, by high hopper in stove, add waste slag of vacuum degassing refining furnace 1200kg altogether in three batches, lime 1200kg, rhombspar 300kg carry out slag making and operate.Temperature in the stove 〉=1540 ℃ is got material molten steel is analyzed.According to the composition analysis result, continuing to send electricity, oxygen blown while in stove, to add lime 600kg, rhombspar 100kg.When quality per distribution ratio, the temperature of molten steel composition reached table 3 and require, can tap entered refining procedure.(steel grade of present embodiment is LZ50)
Table 3
| Composition | ??C％ | ??P％ | Temperature |
| The tapping condition | ??0.30-0.40 | ??≤0.015 | ??1630-1660℃ |
By present embodiment as seen: the method that adopts waste slag of vacuum degassing refining furnace to recycle in the hot metal pretreatment process, the liquid iron pretreatment dephosphorizing rate reaches 50%.
Consumption contrast during duration of test and the not test (N.T.) sees Table 4.
Table 4
March, electric furnace list stove consumed (every stove output of steel is by 58 tons of calculating)
| Consume | Lime quantity kg | Rhombspar quantity kg | Power consumption kwh | Oxygen consumption m3 | Change clear P% |
| Hot metal pre process procedures | ??2000 | ??2000 | |||
| The electric furnace operation | ??2000 | ??5600 | ??0.014 | ||
| Add up to | ??4000 | ??2000 | ??5600 | ??3444 | |
| Loss per ton steel kg/t | ??68.97 | ??34.48 | ??96.55 | ??59.38 |
Trial period electric furnace list stove consumption (every stove output of steel is by 58 tons of calculating)
| Consume | Lime quantity kg | Rhombspar quantity kg | Power consumption kwh | Oxygen consumption m3 | Change clear P% |
| Hot metal pre process procedures | ??1280 | ??200 | |||
| The electric furnace operation | ??1970 | ??390 | ??4728.89 | ??0.013 | |
| Add up to | ??3250 | ??590 | ??3594.44 |
| Consume | Lime quantity kg | Rhombspar quantity kg | Power consumption kwh | Oxygen consumption m3 | Change clear P% |
| Loss per ton steel kg/t | ??56.03 | ??10.17 | ??81.53 | ??61.97 |
As can be seen from the table: in the hot metal pretreatment process, use vacuum degassing refining furnace to reclaim slag and carry out slag making, can reduce loss per ton steel: lime 12kg/t, rhombspar 24kg/t.
Claims (3)
- A waste slag of vacuum degassing refining furnace utilize method, it comprises following sequential steps:The blocky waste slag of vacuum degassing refining furnace that I will be broken into 5-50mm earlier adds in the iron ladle, molten iron per ton adds waste residue 22-26kg, with iron ladle open connect molten iron to the hot metal mixer station after, enter the refining station and descend the rifle oxygen blast, molten iron temperature before the pre-treatment is not less than 1200 ℃, and the quality per distribution ratio of C, Si, P, S reaches following requirement in the molten iron:C?3.76-4.20％????Si?0.57-1.00％????P≤0.072％????S≤0.070％Add lime, rhombspar again after the blowing igniting, molten iron per ton adds lime 14-18kg, rhombspar 2-6kg; Carry out oxygen blast with the pressure of 0.6-0.78MPa and smelt, blow 4-6 minute the time, look the reaction in furnace situation, add waste slag of vacuum degassing refining furnace again, molten iron adding waste residue 22-26kg per ton; Blow 8-12 minute the time, add lime, rhombspar, it is 22-26kg, rhombspar 2-6kg that molten iron per ton adds amount of lime; Blowing promptly stopped oxygen blast in 16-24 minute, and thermometric, got the slag specimen analysis; The temperature of molten iron is not less than 1600 ℃, taps a blast furnace when the quality per distribution ratio of C, Si, P and S reaches following the requirement in the molten iron:C?2.50-3.10％????Si?0.20-0.26％????P≤0.036％????S≤0.050％；II is blended into the molten iron that disposes in the electric furnace and smelts.
- 2. the method that waste slag of vacuum degassing refining furnace according to claim 1 utilizes is characterized in that: in the smelting process of electric furnace, after cold burden, molten iron have all been adorned, begin to carry out oxygen blast with the fire door water cooled oxygen lance, send the electricity operation simultaneously; After forming the molten bath in the stove, add waste slag of vacuum degassing refining furnace, lime and rhombspar in three batches altogether by high hopper in stove and carry out the slag making operation, the add-on of molten steel per ton is respectively waste residue 18-22kg, lime 18-22kg, rhombspar 3-7kg; Temperature in the stove 〉=1540 ℃ is got material molten steel is analyzed; According to the composition analysis result, continuing to send electricity, oxygen blown while in stove, to add lime and rhombspar, the add-on of molten iron per ton is respectively lime 8-12kg, rhombspar 1-3kg; When molten steel composition, temperature reach the requirement of branch steel grade, can tap.
- 3. the method that waste slag of vacuum degassing refining furnace according to claim 1 and 2 utilizes is characterized in that:When I added iron ladle with the blocky waste slag of vacuum degassing refining furnace of 5-50mm, molten iron per ton added waste residue 24kg; When adding lime, rhombspar again after the blowing igniting, molten iron per ton adds lime 16kg, rhombspar 4kg; Carry out oxygen blast with the pressure of 0.69MPa and smelt, blow 5 minutes the time, look the reaction in furnace situation, add waste slag of vacuum degassing refining furnace again, molten iron per ton adds waste residue 24kg, blows 10 minutes the time adding lime, rhombspar.It is 24kg, rhombspar 4kg that molten iron per ton adds amount of lime.Blow and promptly stopped oxygen blast in 20 minutes;After forming the molten bath in the II stove, in stove, add waste slag of vacuum degassing refining furnace, lime and rhombspar in three batches altogether by high hopper and carry out the slag making operation, the add-on of molten steel per ton is respectively waste residue 20kg, lime 20kg, rhombspar 5kg, continuing to send electricity, oxygen blown while to add lime and rhombspar in stove, the add-on of molten iron per ton is respectively lime 10kg, rhombspar 2kg.
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| CN2009100756770A CN101693940B (en) | 2009-09-30 | 2009-09-30 | Utilizing method of waste slag of vacuum degassing refining furnace |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104250008A (en) * | 2013-05-06 | 2014-12-31 | 青岛隆盛晶硅科技有限公司 | Slag fetching device used after slagging smelting and use method thereof |
| CN110669900A (en) * | 2019-10-08 | 2020-01-10 | 安徽富凯特材有限公司 | Method for reutilization of AOD pre-reduced slag |
-
2009
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104250008A (en) * | 2013-05-06 | 2014-12-31 | 青岛隆盛晶硅科技有限公司 | Slag fetching device used after slagging smelting and use method thereof |
| CN104250008B (en) * | 2013-05-06 | 2016-04-13 | 青岛隆盛晶硅科技有限公司 | A kind of slag making melting slag removing equipment and using method thereof |
| CN110669900A (en) * | 2019-10-08 | 2020-01-10 | 安徽富凯特材有限公司 | Method for reutilization of AOD pre-reduced slag |
| CN110669900B (en) * | 2019-10-08 | 2021-08-06 | 安徽富凯特材有限公司 | Method for reutilization of AOD pre-reduced slag |
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| CN101693940B (en) | 2011-09-07 |
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Granted publication date: 20110907 Termination date: 20170930 |