CN101986079A - Slag adding method for intermediate frequency induction furnace - Google Patents
Slag adding method for intermediate frequency induction furnace Download PDFInfo
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- CN101986079A CN101986079A CN 201010235866 CN201010235866A CN101986079A CN 101986079 A CN101986079 A CN 101986079A CN 201010235866 CN201010235866 CN 201010235866 CN 201010235866 A CN201010235866 A CN 201010235866A CN 101986079 A CN101986079 A CN 101986079A
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- intermediate frequency
- slag
- fluorite
- lime
- frequency furnace
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- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention relates to a slag adding method for an intermediate frequency induction furnace. The method sequentially comprises the following steps of: I, before magnetically-conductive metal raw materials are added, adding the slag of lime and fluorite with the grain size of 5 to 10mm into the intermediate frequency induction furnace; II, starting to load the magnetically-conductive metal raw materials for melting; and III, after a liquid surface is formed by the magnetically-conductive metal raw materials in the intermediate frequency induction furnace, adding a covering agent on the liquid surface. In the step I, the total adding amount G of the lime and the fluorite slag is D*10G1, wherein G is the adding amount of the slag in unit of kilogram; G1 is the molten amount of the metal raw materials in unit of ton; and D is the inside diameter of the intermediate frequency induction furnace in unit of meter. The slag comprises the following components in part by mass: 1 part of fluorite and 4.5 to 5.5 parts of lime. In the step III, the adding amount of the covering agent is 15 to 20 percent based on the total adding amount of the lime and the fluorite. The slag adding method for the intermediate frequency induction furnace avoids heat dissipation of molten steel due to exposing, thereby lowering electricity consumption.
Description
Technical field
What the present invention relates to a kind of intermediate frequency furnace adds the slag method.
Background technology:
Intermediate frequency furnace is in steel-making or fusing magnetic conductive metal raw material process, after raw metal in the stove all melts, at temperature-rise period, because magnetic field circulation and top and the bottom molten steel action of thermal difference, comparatively violent boiling can take place in liquid steel level, the slag method that adds of existing intermediate frequency furnace is: the raw metal fusing in the intermediate frequency induction furnace, and local formation after the molten bath adds lime in stove, slag charges such as fluorite, after slag charge adds, because slag charge contacts with atmosphere, the upper steel coolant-temperature gage is lower simultaneously, slag charge utmost point infusibilityization, all attached collection is in the furnace wall, cause the molten steel boiling exposed, a large amount of heat-energy losses cause power consumption to raise.
Summary of the invention
In order to overcome the above-mentioned deficiency that adds the slag method of existing intermediate frequency furnace, the invention provides a kind of exposed heat radiation of having stopped molten steel, thereby reduced electric quantity consumption intermediate frequency furnace add the slag method.
Design of the present invention is such: the exposed problem after melting for fear of molten steel must make the slag of adding can melt slagging fast, and evenly cover molten steel top.Therefore before the raw material of Medium frequency induction deposite metal, earlier with lime (CaO) and fluorite (CaF
2) slag charge adds in the stove, (CaO), fluorite (CaF
2) both proportion by weight is:
Fluorite 1 lime 4.5～5.5
The slag charge granularity is controlled at: 5～10mm.
Both best in quality part proportionings are:
Fluorite 1 lime 5
Wait lime (CaO) and fluorite (CaF then
2) after the fusing, the slag top that forms at lime and fluorite adds coverture.The coverture addition is according to (CaO) and fluorite (CaF
2) the adding total amount determine, be generally (CaO) and fluorite (CaF
2) total amount 15%～20%.
Illustrate: SiO in the coverture
2, CaO, Al
2O
3With the mass percent of the content of MgO be:
SiO
212%～15% CaO, 26%～34% fixed carbon 10%～12%
Al
2O
3 33％～43％ MgO 5％～8％ Fe
2O
3 0.5％～2％
The slag method that adds of this intermediate frequency furnace comprises following sequential steps:
I adds lime, the fluorite slag charge of granularity 5～10mm in the intermediate frequency furnace before magnetic conductive metal raw material (steel scrap, the pig iron, chromium, manganese alloy etc.) adds.
The magnetic conductive metal raw material that begins to pack into after the II melts, and lime, fluorite slag charge and magnetic conductive metal raw material melt jointly.
III adds coverture after treating that the magnetic conductive metal raw material in the intermediate frequency furnace stove forms liquid level on liquid level, add coverture and play insulation effect on the one hand, avoids scattering and disappearing of slag heat; On the other hand, coverture has good auxilliary malleability, and after the adding stove was interior, coverture can be used as carrier, drives the auxilliary equably exhibition of other slag charge on molten steel top.
Above-mentioned intermediate frequency furnace add the slag method, it is characterized in that: in the step I,
Lime, the total addition of fluorite slag charge are:
G＝D×10G
1
Wherein G is the slag charge addition, unit: kilogram
G
1Be raw metal fusing amount, unit: ton
D is the intermediate frequency furnace internal diameter, unit: rice
Illustrate: slag charge addition deviation is answered≤10Kg.
The proportion by weight of slag charge composition is:
Fluorite 1 lime 4.5～5.5
The slag charge granularity is controlled at: 5～10mm.
Both best in quality part proportionings are:
Fluorite 1 lime 5.
In the step III, too much cause molten steel recarburization and furnace lining etch in the stove for fear of the coverture adding, cover addition according to lime (CaO) and fluorite (CaF
2) always addition is definite, addition is lime (CaO) and fluorite (CaF
2) total addition (quality) 15～20%.
This intermediate frequency furnace add the slag method, molten steel boiling, heat radiation are starting point in the stove from avoiding, by improving slagging process, the exposed heat radiation of having stopped molten steel, thus reduced electric quantity consumption.When intermediate frequency furnace steel-making or fusing magnetic conductive metal raw material, avoided the exposed power consumption rising problem that causes of invar water or metal liquid boiling.
The specific embodiment
Describe the specific embodiment that adds the slag method of this intermediate frequency furnace in detail below in conjunction with embodiment, but the specific embodiment that adds the slag method of this intermediate frequency furnace is not limited to following embodiment:
Embodiment one:
The nominal capacity of the intermediate frequency furnace of present embodiment is 8 tons, and internal diameter is 1 meter.
7 tons of intermediate frequency furnace melting waste steels.
The step that this intermediate frequency furnace adds the slag method is:
Earlier with lime, the processing of fluorite slag charge, make the granularity of lime, fluorite reach 5～10mm before the I charging, the slag charge after will processing then adds in the stove, and addition is: 70Kg;
The 7 tons of steel scraps that begin to pack into after the II melt, and lime, fluorite slag charge and magnetic conductive metal raw material melt jointly.
III adds coverture 14Kg after treating that the steel scrap in the intermediate frequency furnace stove forms liquid level on liquid level, coverture adds the rear drive slag and evenly covers molten steel top, has avoided the exposed of molten steel, has also avoided scattering and disappearing of slag heat simultaneously.
This stove intermediate frequency furnace power consumption is: 4130Kwh, not with the steel scrap of this method fusing same amount, average current drain was: 4410Kwh in the past.
Embodiment two:
The nominal capacity of the intermediate frequency furnace of present embodiment is 8 tons, and internal diameter is 1 meter.
6 tons of intermediate frequency furnace fusing manganese alloys.
Earlier lime, fluorite slag charge are processed before the I fusing, made granularity reach 5-10mm, the slag charge after will processing then adds in the stove, and addition is: 65Kg.
The manganese alloy that begins to pack into after the II melts for 6 tons, and lime, fluorite slag charge and magnetic conductive metal raw material melt jointly.
III adds coverture 10Kg after treating to form liquid level in the stove on liquid level, coverture adds the rear drive slag and evenly covers molten steel top, has avoided the exposed of molten steel, has also avoided scattering and disappearing of slag heat simultaneously.
This stove intermediate frequency furnace power consumption is: 3648Kwh, not with the manganese metal alloy of this method fusing same amount, average current drain was: 3810Kwh in the past.
The proportion by weight of above-mentioned two used slag charges of embodiment is:
Fluorite 1 lime 5
SiO in the used coverture
2, CaO, Al
2O
3With the mass percent of the content of MgO be:
SiO
2 4％ CaO 29％ Al
2O
3 38％ MgO 2％。
Claims (3)
- An intermediate frequency furnace add the slag method, it comprises following sequential steps:I adds lime, the fluorite slag charge of granularity 5～10mm in the intermediate frequency furnace before the magnetic conductive metal raw material adds;The magnetic conductive metal raw material that begins to pack into after the II melts;III adds coverture after treating that the magnetic conductive metal raw material in the intermediate frequency furnace stove forms liquid level on liquid level.
- Intermediate frequency furnace according to claim 1 add the slag method, it is characterized in that: above-mentioned intermediate frequency furnace add the slag method, it is characterized in that lime, the total addition of fluorite slag charge are in the step I:G＝D×10G 1Wherein G is the slag charge addition, unit: kilogramG 1Be raw metal fusing amount, unit: tonD is the intermediate frequency furnace internal diameter, unit: riceThe proportion by weight of slag charge composition is:Fluorite 1 lime 4.5～5.5The slag charge granularity is controlled at: 5～10mm.
- Intermediate frequency furnace according to claim 1 and 2 add the slag method, it is characterized in that:In the step III, too much cause molten steel recarburization and furnace lining etch in the stove for fear of the coverture adding, cover addition and determine that according to lime and the total addition of fluorite addition is 15～20% of lime and the total addition of fluorite.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102358662A CN101986079B (en) | 2010-07-22 | 2010-07-22 | Slag adding method for intermediate frequency induction furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102358662A CN101986079B (en) | 2010-07-22 | 2010-07-22 | Slag adding method for intermediate frequency induction furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101986079A true CN101986079A (en) | 2011-03-16 |
| CN101986079B CN101986079B (en) | 2012-07-18 |
Family
ID=43710444
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|---|---|---|---|
| CN2010102358662A Expired - Fee Related CN101986079B (en) | 2010-07-22 | 2010-07-22 | Slag adding method for intermediate frequency induction furnace |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1373229A (en) * | 2001-03-05 | 2002-10-09 | 朱兴发 | Method for smelting stainless steel with waste steel by frequency-conversion electric induction furnace |
| CN1786227A (en) * | 2005-12-02 | 2006-06-14 | 攀枝花慧泰金属新材料有限公司 | Method of directly smelting vanadium alloy steel or vanadium titanium alloy steel using vanadium containing pig iron or sponge iron |
| CN101338354A (en) * | 2008-08-08 | 2009-01-07 | 昆明理工大学 | Phosphorus-containing coarse nickel iron refining dephosphorization method |
| CN101386951A (en) * | 2008-10-17 | 2009-03-18 | 河北上大再生资源科技有限公司 | Nickel-copper intermediate alloy and melting and purification treatment method thereof |
-
2010
- 2010-07-22 CN CN2010102358662A patent/CN101986079B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1373229A (en) * | 2001-03-05 | 2002-10-09 | 朱兴发 | Method for smelting stainless steel with waste steel by frequency-conversion electric induction furnace |
| CN1786227A (en) * | 2005-12-02 | 2006-06-14 | 攀枝花慧泰金属新材料有限公司 | Method of directly smelting vanadium alloy steel or vanadium titanium alloy steel using vanadium containing pig iron or sponge iron |
| CN101338354A (en) * | 2008-08-08 | 2009-01-07 | 昆明理工大学 | Phosphorus-containing coarse nickel iron refining dephosphorization method |
| CN101386951A (en) * | 2008-10-17 | 2009-03-18 | 河北上大再生资源科技有限公司 | Nickel-copper intermediate alloy and melting and purification treatment method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 《山西冶金》 201006 杨利忠 LF炉与中频炉双联冶炼高合金钢工艺实践 第33卷, 第3期 2 * |
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| CN101986079B (en) | 2012-07-18 |
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Granted publication date: 20120718 Termination date: 20180722 |