CN1263951A - Technology for forming reductive foam slag in ladle furnace - Google Patents
Technology for forming reductive foam slag in ladle furnace Download PDFInfo
- Publication number
- CN1263951A CN1263951A CN99113486A CN99113486A CN1263951A CN 1263951 A CN1263951 A CN 1263951A CN 99113486 A CN99113486 A CN 99113486A CN 99113486 A CN99113486 A CN 99113486A CN 1263951 A CN1263951 A CN 1263951A
- Authority
- CN
- China
- Prior art keywords
- ladle furnace
- foaming agent
- furnace
- powder
- slag
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000002893 slag Substances 0.000 title claims abstract description 33
- 238000009847 ladle furnace Methods 0.000 title claims abstract description 22
- 239000006260 foam Substances 0.000 title abstract description 14
- 230000002829 reductive effect Effects 0.000 title abstract description 9
- 238000005516 engineering process Methods 0.000 title abstract 2
- 239000004088 foaming agent Substances 0.000 claims abstract description 17
- 239000007921 spray Substances 0.000 claims abstract description 3
- 239000000843 powder Substances 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 2
- 239000004604 Blowing Agent Substances 0.000 claims 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims 1
- 235000019738 Limestone Nutrition 0.000 claims 1
- 125000005587 carbonate group Chemical group 0.000 claims 1
- 239000010459 dolomite Substances 0.000 claims 1
- 229910000514 dolomite Inorganic materials 0.000 claims 1
- 239000012535 impurity Substances 0.000 claims 1
- 239000006028 limestone Substances 0.000 claims 1
- 239000002245 particle Substances 0.000 claims 1
- 238000010891 electric arc Methods 0.000 abstract description 5
- 238000010438 heat treatment Methods 0.000 abstract description 3
- 230000005855 radiation Effects 0.000 abstract 1
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 4
- 238000005187 foaming Methods 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 239000012159 carrier gas Substances 0.000 description 3
- 238000007670 refining Methods 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- 229910052786 argon Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000011819 refractory material Substances 0.000 description 2
- 229910005883 NiSi Inorganic materials 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- VTYYLEPIZMXCLO-UHFFFAOYSA-L calcium carbonate Substances [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
Classifications
-
- 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
Landscapes
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
A technology for forming reductive foam slags in ladle furnace features that hollow electrode is used to continuously spray the foaming agent into ladle furnace to forming stable foam slags layer, which can shield the radiation of electric arc to furnace liner, resulting in low matrial consumption and higher heating efficiency of electric arc.
Description
The invention relates to a method for producing reducing foam slag in a ladle furnace (1) by adopting a hollow electrode (2).
Ladle furnaces are widely used as an important secondary refining device, but the operation cost is too high due to the excessive loss of lining refractory materials. By taking the experience of the electric arc furnace as a reference, the foam slag submerged arc operation needs to be introduced into the ladle furnace. However, the ladle furnace uses reducing slag, and lacks a condition of generating a large amount of gas, so that an external gas source needs tobe introduced. The existing method is to add foaming agent in the refining process to keep the slag in a foaming state. In order to obtain a continuous and stable foam slag layer and avoid the interference of charging on the operation process as much as possible, a hollow electrode is adopted to continuously spray a foaming agent into the ladle furnace, and the continuous decomposition of the foaming agent can form a stable foam slag layer (3) in the ladle furnace.
The equipment suitable for the invention is a ladle furnace (1) provided with one or three electrodes, the electrodes are clamped by an electrode arm (5) through an electrode chuck (4), the composition schematic diagram of the whole system is shown in the figure, powder is conveyed into a slag layer by a hollow electrode (2) through a hose (6) by a powder spraying device (7), and argon can be used as carrier gas according to the metallurgical requirements of refined steel grades.
Blowing foaming agent, CaCO3For the powder example, the following two reactions occur within the slag layer:
wherein C is mainly from coke powder in the foaming agent.
In order to protect the furnace lining and improve the heating efficiency of the ladle furnace, the ladle furnace is required to make foam slag as soon as possible after the ignition arc is formed. Therefore, the foaming agent is blown to the slag layer by adopting larger powder flow from 4-8min before arc striking to about 10min after arc striking. After the arc striking, the ladle furnace adopts short arc operation, when the arc light exposure in the ladle furnace is obviously reduced and the noise is obviously reduced, the submerged arc operation is realized, and the powder feeding speed can be properly reduced. Before power supply, powder is sprayed for 3-5min at a large flow.
According to the actual operation requirement, the thickness of the foamy slag in the ladle furnace needs to be kept at a proper height, and the adjustment of the thickness of the foamy slag layer can be completed by changing the powder spraying speed and the carrier gas flow. The utilization efficiency of the foaming agent is mainly determined by the penetration depth of the powder gas flow.
The hollow electrode of the ladle furnace is blown with the foaming agent to produce the reductive foam slag, and a large number of comparative heat tests show that the hollow electrode has the following advantages:
1. easy foaming and simple control. By adopting the method, the stable foam slag layer can be formed after the arc striking of the ladle furnace is carried out for 2-8min, the complete submerged arc is realized, and the thickness of the foam slag layer can be adjusted by adjusting the powder flow and the powder-gas ratio.
2. The hollow electrode is adopted to add foaming material, so that the interference to the operation when the material is added is avoided, and the method has important significance particularly to ladle refining systems operated under vacuum, such as VAD and LFV.
3. The foaming agent is added by adopting the method introduced by the invention, and the foaming agent is sprayed into the slag layer at a certain speed, so that the foaming agent has the characteristics of easiness in foaming and high utilization rate of the foaming agent.
4. Because the foam slag layer completely shields the electric arc, the heat load of the furnace lining is effectively reduced, particularly the hotspot temperature of the slag line is obviously reduced, and the effect of reducing the consumption of refractory materials of the furnace lining is obvious.
5. Test results show that the foam slag layer can obviously improve the heating efficiency of the electric arc and reduce the temperature of hot spots on the furnace lining.
6. According to different metallurgical purposes, the type of the carrier gas is changed, and the effects of denitrification and nitrogen increase in molten steel can be realized: argon can be denitrified, and nitrogen can be added.
7. The method does not need to greatly change the production process of the ladle furnace, and has the advantages of low investment and low operation cost.
Example (b):
the method of the invention is carried out on a 100Kg direct current ladle furnace. Molten steel with the temperature of 1600 ℃ is adopted, 3-6Kg of slag is added, the thickness of a slag layer is 10-25mm, foaming agent is sprayed on the slag layer for 1min before arc striking, and the arc length is 30-50mm after arc striking. 8 NiCr-NiSi thermocouples are adopted and buried in the furnace lining at the slag line part to detect the temperature change of the furnace lining. The distance between the thermocouple tip and the inner wall of the furnace lining is mm. When the temperature of the molten steel is kept constant basically, powder spraying operation is carried out to produce foamed slag, 4-10min after arc striking, a stable foamed slag layer with the thickness of 80mm is formed in the furnace, and submerged arc operation is realized. Before and after the submerged arc operation of the foamed slag, the temperature drop amplitude (constant temperature before implementation-temperature after implementation) detected by the thermocouple reaches 40 ℃.
Claims (2)
1. A method for producing reducing foamed slag in ladle furnace features that one or more hollow electrodes are used to continuously spray foaming agent to the refined slag layer in ladle furnace to increase its volume and form stable foamed slag layer.
2. The method of claim 1, wherein the blowing agent is of the type and particle size. The foaming agent is carbonate powder or dolomite (limestone) powder, 5-30% (weight percentage, the same below) of coke powder is added, the carbonate is not less than 65%, the rest is impurities, and the granularity of the foaming agent is not more than 1.0 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99113486A CN1263951A (en) | 1999-02-15 | 1999-02-15 | Technology for forming reductive foam slag in ladle furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99113486A CN1263951A (en) | 1999-02-15 | 1999-02-15 | Technology for forming reductive foam slag in ladle furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1263951A true CN1263951A (en) | 2000-08-23 |
Family
ID=5276673
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN99113486A Pending CN1263951A (en) | 1999-02-15 | 1999-02-15 | Technology for forming reductive foam slag in ladle furnace |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1263951A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100360689C (en) * | 2000-03-17 | 2008-01-09 | 密执安特种矿石公司 | Process and apparatus for automatically controlling slag foaming |
| CN101696460B (en) * | 2009-05-25 | 2010-12-29 | 莱芜钢铁集团有限公司 | Process and device for dual continuous steel making with iron-containing material rotary hearth furnace |
| CN102277467A (en) * | 2010-06-09 | 2011-12-14 | 鞍钢股份有限公司 | Method for denitrifying molten steel in converter tapping process |
| CN107299195A (en) * | 2017-06-23 | 2017-10-27 | 什邡市三裕锻件有限公司 | A kind of use lime stone makes the steelmaking method of ladle refining furnace of floride-free foamed slag |
| CN107604126A (en) * | 2017-08-07 | 2018-01-19 | 山西太钢不锈钢股份有限公司 | The method for reducing electric furnace electrode consumption |
| CN107794341A (en) * | 2016-09-06 | 2018-03-13 | 鞍钢股份有限公司 | Nitrogen increasing device and method for refining process of L F furnace |
| CN108396103A (en) * | 2017-02-05 | 2018-08-14 | 鞍钢股份有限公司 | Method for removing slag by using ladle powder injection instead of molten steel |
| CN112458236A (en) * | 2021-01-29 | 2021-03-09 | 北京科技大学 | Method for refining and deep desulfurization of molten steel, device for refining molten steel and application |
-
1999
- 1999-02-15 CN CN99113486A patent/CN1263951A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100360689C (en) * | 2000-03-17 | 2008-01-09 | 密执安特种矿石公司 | Process and apparatus for automatically controlling slag foaming |
| CN101696460B (en) * | 2009-05-25 | 2010-12-29 | 莱芜钢铁集团有限公司 | Process and device for dual continuous steel making with iron-containing material rotary hearth furnace |
| CN102277467A (en) * | 2010-06-09 | 2011-12-14 | 鞍钢股份有限公司 | Method for denitrifying molten steel in converter tapping process |
| CN107794341A (en) * | 2016-09-06 | 2018-03-13 | 鞍钢股份有限公司 | Nitrogen increasing device and method for refining process of L F furnace |
| CN108396103A (en) * | 2017-02-05 | 2018-08-14 | 鞍钢股份有限公司 | Method for removing slag by using ladle powder injection instead of molten steel |
| CN108396103B (en) * | 2017-02-05 | 2020-01-07 | 鞍钢股份有限公司 | A kind of method of ladle spraying powder instead of molten steel slag scraping |
| CN107299195A (en) * | 2017-06-23 | 2017-10-27 | 什邡市三裕锻件有限公司 | A kind of use lime stone makes the steelmaking method of ladle refining furnace of floride-free foamed slag |
| CN107604126A (en) * | 2017-08-07 | 2018-01-19 | 山西太钢不锈钢股份有限公司 | The method for reducing electric furnace electrode consumption |
| CN112458236A (en) * | 2021-01-29 | 2021-03-09 | 北京科技大学 | Method for refining and deep desulfurization of molten steel, device for refining molten steel and application |
| CN112458236B (en) * | 2021-01-29 | 2021-04-30 | 北京科技大学 | Method for refining and deep desulfurization of molten steel, device for refining molten steel and application |
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| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |