CN101880754A - Submerged arc foaming agent of LF (Low Frequency) furnace - Google Patents
Submerged arc foaming agent of LF (Low Frequency) furnace Download PDFInfo
- Publication number
- CN101880754A CN101880754A CN2009100114745A CN200910011474A CN101880754A CN 101880754 A CN101880754 A CN 101880754A CN 2009100114745 A CN2009100114745 A CN 2009100114745A CN 200910011474 A CN200910011474 A CN 200910011474A CN 101880754 A CN101880754 A CN 101880754A
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- China
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- percent
- foaming
- foaming agent
- submerged arc
- slag
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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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- 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
The invention discloses a submerged arc foaming agent of an LF (Low Frequency) furnace, which is applied to foaming refining slag in the LF furnace during temperature rise and is prepared into a mixer from the following components in percentage by weight: 35-65 percent of CaCO3, 38-18 percent of MgCO3, 5-15 percent of CaC2, 5-15 percent of NaCl, 5-15 percent of CaCl and inevitable impurities. The components are required to meet the relationships of CaCO3+MgCO3>= 50% and NaCl+CaCl=10-30%. The foaming agent has the advantages of short foaming time of the refining slag, long foam maintaining time, safe and quick heating, low noise in the temperature rise process, shortening in the temperature rise time, improvement on the temperature rise efficiency by over 40 percent, no additional pollution to the molten steel and no reduction on the function of the refining slag.
Description
Technical field
The invention belongs to steel-making refining field, be used for the refining slag foaming when particularly LF heats up, to realize a kind of LF stove submerged arc foaming agent of submerged arc heating.
Background technology
In the refining process of LF, the oxygen gesture of slag is very low, and the reaction between carbon and oxygen in the slag blanket is very faint, in order to produce foamy slag to realize the submerged arc heating, must introduce whipping agent in the temperature-rise period.
The whipping agent that adds should make the refining slag foamed reach certain thickness at temperature-rise period, to guarantee that also it does not cause additional the pollution to molten steel, also to consider Financial cost simultaneously, about the making of steel-making refining field whipping agent and the research of the problem of use a lot of reports be arranged both at home and abroad at present.
Chinese patent grant number CN1038518 discloses a kind of submerged arc slag of steel bucket finery, and whipping agent consists of: CaCO
315%～25% (weight), CaCl
210%～30% (weight), NaCl 15%～35% (weight), CaC
220%～60% (weight), consumption are 3～8kg/t.The problem that this patented technology exists that foaming effect is poor, consumption is many, may make molten steel carburetting, cost is high.
Chinese patent CN1254019A discloses a kind of ladle finer reduction foaming agent, contains CaO40%～70% (weight), CaCO
35%～15% (weight), MgCO
33%～10% (weight), SiO
22%～8% (weight), CaC
20%～15% (weight), SiC0%～15% (weight), C powder 2%～8% (weight), wherein: CaC
2+ SiC 〉=5% (weight), surplus are impurity.In the ladle refining process, whipping agent is added in batches, and the adding total amount is 2～5kg/t.The problem that same this patented technology exists also that to produce that bubble is few, foam is held time short, consumption is many, may make molten steel carburetting, cost is high.
Chinese patent CN1263951A discloses a kind of method of making the reductibility foamy slag in ladle furnace.Adopt hollow electrode in ladle furnace, to spray into whipping agent continuously, to form stable foam slag blanket, thereby shielded arc is to the radiation of furnace lining, can reach the purpose that reduces refractory consumption, improves electric-arc heating efficient, and can be by changing powder and carrier gas, can become the technological process that satisfies other smelting target.But the problem of its existence is whipping agent foaming effect difference and keeps foamy time weak point, so need spray into whipping agent continuously.And use hollow electrode in ladle furnace, to spray into the complex process of whipping agent, equipment cost is also high.
Make and make being used for from above existing whipping agent, these submerged arc slagging methods all exist foam hold time short, application art is complicated, may make molten steel carburetting, problems such as consumption is big, cost height.
Summary of the invention
The objective of the invention is to overcome that application complexity, foaming effect that above-mentioned LF stove submerged arc foaming agent exists are poor, foam is held time is short, consumption is big, may make problems such as molten steel carburetting, cost height in application, provide a kind of be simple and easy to, foam good with, foaming effect hold time long, consumption is few, cost is low, do not influence the function of refining slag, molten steel is not caused the additional LF stove submerged arc foaming agent that pollutes.
The present invention is a kind of compound LF stove submerged arc foaming agent, is mixed with mixture by weight percentage, and its component is: CaCO
335%～65%, MgCO
38%～18%, CaC
25%～15%, NaCl 5%～15%, CaCl
25%～15% and unavoidable impurities, mentioned component also will satisfy CaCO
3+ MgCO
3〉=50%, NaCl+CaCl
2Be 10%～30%.
Carbonate (CaCO among the present invention
3And MgCO
3) and CaCl
2All play the effect of foaming; Carbonate (CaCO
3And MgCO
3) generation CO when pyrolytic decomposition
2As the inherent source of the gas of foaming, MgCO
3The MgO that produces after decomposition also plays and alleviates the effect of slag to lining erosion; NaCl is as the slag tensio-active agent; The CaC that adds
2As reductive agent, make the slag deoxidation, reduce the oxidisability of refining slag, also play the effect of foaming simultaneously.
Because the present invention adopts CaCO simultaneously
3, MgCO
3, CaCl
2And CaC
2Play foaming effect (CaC2 goes back the slag deoxidation simultaneously), they cooperate jointly, keep stable foaming in the heating-up time, and NaCl regulates the foamy slag surface tension, keeps the time that foam exists, to satisfy the intensification requirement.
The present invention requires CaCO
3+ MgCO
3〉=50% and NaCl+CaCl
210%～30% its objective is the thickness requirement that can satisfy foaming, can also guarantee that foamy holds time, and can not cause molten steel carburetting simultaneously.
The present invention once adds above-mentioned whipping agent by 0.5～1.0kg/t.s before refining heats up, and its foamed time can be kept 10～15min.
When the present invention heats up in the refining of LF stove, only need to use the small amount of foaming agent to join the slag surface, can realize arc-covering slag operation, not only using method is simple, and its raw material sources are wide, needn't change production unit and technology, and use cost is also cheap.
(1) good, the foam of the foaming effect of the whipping agent length of holding time, usage quantity is few, uses easily;
(2) from cost, LF stove submerged arc foaming agent of the present invention has very significantly cost advantage, according to Angang Stock Co., Ltd's slag charge purchase cost price in 2006, cost-saved 255 yuan of every stove (1.41 yuan of/ton steel reduce cost), this cost reduces more than 50% than other whipping agents, and annual direct economic benefit and social benefit are all considerable;
(3) using method is simple, only need join the slag surface and get final product, and needn't change production unit and technology;
(4) foaming effect good, significantly shorten the heating-up time, intensification efficient can improve more than 40%, reduces power consumption and consumption of electrode, improves ladle furnace lining work-ing life;
(5) use this whipping agent after, foamy slag shields electric arc fully, the arc hissing that LF stove submerged arc heats up is very little, has improved operator's Working environment;
(6) production application shows, uses this whipping agent, molten steel is not caused additional the pollution, does not reduce deoxidation, the desulfurizing function of refining slag, and it is air-breathing also to reduce molten steel simultaneously.
The present invention can also save the power consumption and the consumption of electrode of refining process, shorten the refining furnace refining time, improve the work-ing life of ladle, the submerged arc heating is a requisite process procedure in the LF refining temperature-rise period, produces all significant to reducing LF refining cost and high efficiency.
Embodiment
LF stove submerged arc foaming agent of the present invention is mixed with mixture by weight percentage, and component is: CaCO
335%～65%, MgCO
38%～18%, CaC
25%～15%, NaCl 5%～15%, CaCl
25%～15% and unavoidable impurities, mentioned component also will satisfy CaCO
3+ MgCO
3〉=50%, NaCl+CaCl
2Be 10%～30%.
The present invention has carried out the production test of stove surplus in the of 70 respectively when Al killed steel refinings such as X65, X70 pipe line steel, its foaming effect is good, significantly shorten the heating-up time, and intensification efficient can improve more than 40%, reduces power consumption and consumption of electrode.
Introduce several specific embodiment of the present invention below, see the following form:
Before the LF refining heats up, LF stove submerged arc foaming agent of the present invention is added the ladle slag surface by 0.5～1.0kg/t.s,, do not influence total quantity of slag of refining slag because foaming agent consumption of the present invention is few.
Use whipping agent of the present invention, the refining slag foaming time is short, the foam length of holding time, energy safety, heating rapidly, the temperature-rise period noise is low, shortens the heating-up time, intensification efficient can improve more than 40%, molten steel is not caused additional the pollution simultaneously, does not reduce the function of refining slag.
This bright employing Wingdale, wagnerite, calcium carbide, industrial sodium-chlor and calcium chloride are raw material, and its wide material sources, consumption is few, cost is low, and other similar whipping agents are cost-saved more than 50% than adopting.
The present invention can or directly use powder with its compound stalk forming in use.During compound stalk forming, be that above-mentioned raw materials is prepared in proportion, adhesive-free is through pressure forming in closed system, and the composite slag ball is the globoid of φ 10～φ 15mm, and forming pressure is 30～35MPa.
Claims (2)
1. a LF stove submerged arc foaming agent is characterized in that, its composition by weight percentage, Ca:CO
335%～65%, MgCO
3: CaC 8%～18%,
2: 5%～15%, NaCl:5%～15%, CaCl
2: 5%～15% and unavoidable impurities.
2. a kind of LF stove submerged arc foaming agent according to claim 1 is characterized in that mentioned component satisfies CaCO
3+ MgCO
3〉=50%, NaCl+CaCl
2Be 10%～30%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100114745A CN101880754A (en) | 2009-05-06 | 2009-05-06 | Submerged arc foaming agent of LF (Low Frequency) furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100114745A CN101880754A (en) | 2009-05-06 | 2009-05-06 | Submerged arc foaming agent of LF (Low Frequency) furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101880754A true CN101880754A (en) | 2010-11-10 |
Family
ID=43052894
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009100114745A Pending CN101880754A (en) | 2009-05-06 | 2009-05-06 | Submerged arc foaming agent of LF (Low Frequency) furnace |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101880754A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105177223A (en) * | 2015-08-25 | 2015-12-23 | 新疆中合大正商贸有限公司 | Process of using magnesia-calcium-carbon balls in LF steel making |
| 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 |
| CN113699315A (en) * | 2021-09-14 | 2021-11-26 | 重庆西辅冶金材料有限公司 | Refining slag for LF refining and use method thereof |
-
2009
- 2009-05-06 CN CN2009100114745A patent/CN101880754A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105177223A (en) * | 2015-08-25 | 2015-12-23 | 新疆中合大正商贸有限公司 | Process of using magnesia-calcium-carbon balls in LF steel making |
| CN105177223B (en) * | 2015-08-25 | 2017-06-30 | 新疆中合大正商贸有限公司 | The technique that a kind of magnesium calcium carbon ball is used for LF steel-making |
| 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 |
| CN113699315A (en) * | 2021-09-14 | 2021-11-26 | 重庆西辅冶金材料有限公司 | Refining slag for LF refining and use method thereof |
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Application publication date: 20101110 |