CN107201423A - A kind of use calcium carbonate replaces the arc furnace steelmaking process of calcium oxide making foamed slag - Google Patents
A kind of use calcium carbonate replaces the arc furnace steelmaking process of calcium oxide making foamed slag Download PDFInfo
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- CN107201423A CN107201423A CN201710485761.4A CN201710485761A CN107201423A CN 107201423 A CN107201423 A CN 107201423A CN 201710485761 A CN201710485761 A CN 201710485761A CN 107201423 A CN107201423 A CN 107201423A
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- China
- Prior art keywords
- calcium carbonate
- foamed slag
- arc
- slag
- making foamed
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/52—Manufacture of steel in electric furnaces
- C21C5/54—Processes yielding slags of special composition
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The present invention relates to field of smelting, more particularly to a kind of use calcium carbonate replaces the arc furnace steelmaking process of calcium oxide making foamed slag, comprised the following steps：1）Charging procedure；2）Melt step；3）Heating step；4）Oxidation step, CO2 and the CaO, CO of high activity are produced when being made steel in electric arc furnaces by adding calcium carbonate pyrolytic2It is pollution-free, CO2Bubble floating formation foamed slag, foamed slag energy submerged arc completely, the exposed high temperature corrosion furnace wall of electric arc is prevented effectively from while avoiding electric arc is exposed from causing energy loss and effectively reduce the noise that electrode is produced in arc process is produced, foam slag blanket can be with the C reaction generations CO in flue dust, so as to reduce the operating environment of smoke contamination containing C produced in smelting process, P2O5 in the CaO and molten steel of high activity produces stable are stored in steel stove slag of oxidation reaction generation CaO.P2O5 and removed, so as to reach the effect except P.
Description
Technical field
The present invention relates to field of smelting, more particularly to a kind of use calcium carbonate replaces the electric arc furnaces of calcium oxide making foamed slag to refine
Steel method.
Background technology
Electric-arc furnace steelmaking be the high temperature produced using electric arc come smelting metal, but gas discharge formation electric arc when energy
Amount is extremely concentrated, and arc area temperature reaches during more than 3000 DEG C, conventional electric arc heated that foamed slag is hardly produced, so as to lead
Cause submerged arc effect poor, exposed electric arc produces noise greatly, and the carbon containing flue dust produced during metal smelt is more, pollute environment, it is naked
The easy high temperature corrosion furnace wall of electric arc of dew, shortens the service life of furnace wall, while exposed arclight causes energy loss, was making steel
When adding metallurgy CaO dephosphorization in journey, traditional CaO activity is low and produces the substantial amounts of CO of traditional CaO discharges2, CO and dust, energy consumption
Height, emission severe contamination environment, traditional CaO dissolution velocities in molten steel are low with phosphide effective reaction rate in molten steel slowly,
CaO consumption is big during so as to cause to remove P.
In summary, need a kind of technical scheme badly at present to solve in existing steel-making course of the electric arc furnace, foamed slag is difficult life
Causing electric arc furnaces to produce into, submerged arc effect difference, carbon containing flue dust is more, noise is big, and exposed electric arc easily causes high temperature corrosion furnace wall, contracts
The service life of short furnace wall, while arc light leakage causes energy loss, it is low and produce conventional CaO using conventional oxidation calcium activity
Emission severe contamination environment, high energy consumption, traditional CaO poor activities dissolution velocity in molten steel are effective with phosphide in molten steel slowly
Reaction efficiency is low, so that the problem of CaO consumption is big when causing to remove P.
The content of the invention
It is an object of the invention to overcome the above-mentioned deficiency in the presence of prior art traditional using calcium carbonate replacement there is provided one kind
The arc furnace steelmaking process of calcium oxide making foamed slag, foam is made in one kind of the present invention using calcium carbonate instead of conventional oxidation calcium
In the arc furnace steelmaking process of slag, in electric arc furnace smelting process, submerged arc is carried out using calcium carbonate is added into, existing foam is solved
Slag is hardly produced, submerged arc effect difference causes electric arc furnaces to produce that carbon containing flue dust is more, noise greatly, exposed electric arc easily causes furnace wall high temperature
Corrosion, shortens the service life of furnace wall, while arc light is exposed to cause energy loss, low and produce using conventional oxidation calcium activity
Traditional CaO emissions severe contamination environment, high energy consumption, traditional CaO dissolution velocities in molten steel have with the phosphide in molten steel slowly
Validity response rate is low, so that the problem of CaO consumption is big when causing to remove P.
In order to realize foregoing invention purpose, the invention provides following technical scheme：
A kind of use calcium carbonate replaces the arc furnace steelmaking process of calcium oxide making foamed slag, comprises the following steps：
1）Charging procedure：Electric arc furnaces furnace charge.
2）Melt step：By the way that electric arc furnaces is powered melting batch, and it is 200~800m3/h to stove to adjust oxygen flow
Material is fluxing；
3）Heating step：Continue oxygen blast, addition calcium carbonate making foamed slag into electric arc furnaces after furnace charge is melting down and take off P, heating, to melt
Temperature reaches 1570~1590 DEG C, and oxygen flow is 300~500m3/h in heating step；
4）Oxidation step：When melt temperature reaches 1570~1590 DEG C, the oxygen flow for controlling oxygen rifle is 300~800m3/h,
Making foamed slag takes off P, decarburization；
Calcium carbonate is added with making foamed slag when melting and having liquid in step stove, enables foamed slag thickness submerged arc completely.
CO2 and the CaO of high activity are produced by adding calcium carbonate pyrolytic in steelmaking process, CO2 is pollution-free, CO2
After bubble floating formation foamed slag, the complete submerged arc of foamed slag, the exposed high temperature corrosion furnace wall of electric arc can be prevented effectively from while avoiding electricity
Arc is exposed to be caused energy loss and effectively reduces the noise that electrode is produced in arc process is produced, the adsorbable steel-making of foamed slag
During the flue dust that produces and with C reaction generation CO, CO the burning generation CO2 in flue dust, promote steelmaking process, CO burnings are real
Existing energy source secondary is utilized, so as to reduce energy consumption, high activity CaO is generated using calcium carbonate pyrolytic, it is to avoid production routine CaO
When, a large amount of CO2, CO and dust emission pollution environment, the CaO of high activity quick dissolving and produces in molten steel with the P2O5 in molten steel
Stable is stored in steel stove slag of life oxidation reaction generation CaO.P2O5 removes, so as to reach the quick consumption for removing P and reducing CaO
Small purpose, addition calcium carbonate carries out generable three reaction equations of electric arc furnaces submerged arc：Calcium carbonate=CaO+ CO2；CO2+C=
2CO；P2O5+CaO= CaO.P2O5；2CO+O2=2CO2.
Stove smelting procedure of the present invention is compared with traditional smelting procedure, and operational sequence is essentially identical, but by refining
By adding the calcium oxide and CO that calcium carbonate pyrolytic is high activity during steel2, CO2On float on molten steel face formed foamed slag can
Submerged arc is played, noise reduction reduces the effect of the flue dust containing C and do not pollute air, the CaO of high activity quickly dissolves, and and molten steel
In P2O5 oxidation reactions generation CaO.P2O5 be stored in steel stove slag and remove, so as to reach de- P effect, the smelting for steel has
There is prominent facilitation.
It is preferred that, before charging, furnace bottom adds calcium carbonate, and the addition of calcium carbonate is added 15 ~ 25Kg for melting steel per ton, led to
Crossing to add in calcium carbonate, stove in furnace bottom has liquid just to have foamed slag, reaches the purpose of early stage foam slag burialing arc dephosphorization.
It is preferred that, the granularity size of calcium carbonate is 1 ~ 150mm.
It is preferred that, calcium carbonate can mix addition with furnace charge, oxidant, carburant, by adding oxidant in calcium carbonate,
The P content in molten steel is reduced, can require that control adds oxidant according to weight percent content different to P during smelting steel
Amount, requires that control adds the amount of carburant according to the steel of the smelting weight percent content different to C.
It is preferred that, it is 1~300kg/ tons of steel to add the gross weight of calcium carbonate, and calcium carbonate is added stage by stage, using stage by stage
The mode of calcium carbonate is added, Decomposition of Calcium Carbonate can be made fully, and the foamed slag produced reaches and preferably hides effect.
Compared with prior art, beneficial effects of the present invention：
In steelmaking process by add calcium carbonate pyrolytic produce high activity CaO and CO2, CO2 it is pollution-free, CO2 bubbles
On float on molten steel surface and form foamed slag, after the complete submerged arc of foamed slag, the exposed high temperature corrosion furnace wall of electric arc can be prevented effectively from simultaneously
Avoid electric arc is exposed from causing energy loss and effectively reduce the noise that electrode is produced in arc process is produced, foamed slag can be inhaled
The flue dust that is produced in attached steelmaking process and with the C reaction generation CO in flue dust, CO second-time burnings generation CO2, promotion made steel
Journey, CO second-time burnings realize that secondary energy sources are utilized, so as to reduce energy consumption, generate high activity CaO using calcium carbonate pyrolytic, keep away
When having exempted from production tradition CaO, a large amount of CO2, CO and dust emission pollution environment, quick dissolving is simultaneously in molten steel by the CaO of high activity
Removed with stable are stored in steel stove slag of P2O5 generation oxidation reaction generation CaO.P2O5 in molten steel, quickly P is removed simultaneously so as to reach
And reduce the small purpose of CaO consumption.
The beneficial effect of the application other embodiment is：
1st, there is liquid just to have foamed slag by being added in furnace bottom in calcium carbonate, stove, reach the mesh of early stage foam slag burialing arc dephosphorization
's.
2nd, P is removed by adding oxidant in calcium carbonate, reduces the P content in molten steel, can be according to different to P during smelting steel
Weight percent content require control add oxidant amount, according to the steel of the smelting weight percent content different to C will
Control is asked to add the amount of carburant.
3rd, by the way of calcium carbonate is added stage by stage, Decomposition of Calcium Carbonate can be made fully, and the foamed slag produced reaches
To preferably hiding effect.
Brief description of the drawings
Fig. 1 is a kind of structural representation of the method for electric arc furnaces clinker foaming of the present invention.
Reference
1- foamed slags, 2- molten steel, 3- electrode bars, 4- electric arc furnaces, 5- calcium carbonate.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only to explain the present invention, not
For limiting the present invention.
Embodiment 1
As shown in Figure 1, a kind of method of electric arc furnaces clinker foaming of the present embodiment includes foamed slag 1, molten steel 2, electrode bar 3, electricity
Arc stove 4, calcium carbonate 5, when electric arc furnaces 4 is made steel, calcium carbonate can replace CaO with 1% ~ 100%, by adding the high temperature of calcium carbonate 5
The CaO for producing CO2 and high activity is decomposed, CO2 is pollution-free, foamed slag 1, foamed slag 1 are formed on the surface of CO2 bubble floatings molten steel 2
Hide completely, the exposed high temperature corrosion furnace wall of electric arc, more than twice of extension furnace wall service life, so as to save 40% can be prevented effectively from
~ 60% refractory material, electric arc, which is embedded in, can reduce by 20% energy loss and the noise of reduction by 40%, foamed slag 1 in foamed slag 1
Flue dust is produced in adsorbable steelmaking process, the flue dust of reduction by 40% is can reach and generates CO, CO burnings with the C reactions in flue dust
CO2 is generated, CO burnings realize that energy source secondary is utilized, promote steelmaking process, reduce by 40% energy consumption, the CaO of high activity is in molten steel
In quick dissolving and produce stable are stored in steel stove slag of oxidation reaction generation CaO.P2O5 with the P2O5 in molten steel and remove, so as to reach
To except P rates are up to more than 90% and reduce CaO consumption 60%, smelting cost is reduced.
There is liquid just to have foamed slag by being added in furnace bottom in calcium carbonate, stove, the purpose for reaching early stage foam slag burialing arc is gone
Phosphorus, furnace bottom is forbidden to add calcium carbonate when staying steel operation and hot metal charge operation, it is to avoid high temperature action of the calcium carbonate in liquid metal
Lower fast reaction, which is decomposed, produces a large amount of CO2, causes pressure in stove excessive, occurs the perils such as blast.
P is removed by adding oxidant in calcium carbonate, the P content in molten steel is reduced, can be according to different to P during smelting steel
Weight percent content requires the amount of control addition oxidant, according to the weight percent content requirement different to C of the steel of smelting
The amount of control addition carburant.
By the way of calcium carbonate 5 is added stage by stage, calcium carbonate 5 can be made to decompose fully, and the foamed slag produced reaches
To preferably hiding effect.
Above example only not limits technical scheme described in the invention to illustrate the present invention, although this explanation
Book is with reference to each above-mentioned embodiment to present invention has been detailed description, but the present invention is not limited to above-mentioned specific implementation
Mode, therefore any the present invention is modified or equivalent substitution；And the technical side of all spirit and scope for not departing from invention
Case and its improvement, it all should cover among scope of the presently claimed invention.
Claims (5)
1. a kind of use calcium carbonate replaces the arc furnace steelmaking process of calcium oxide making foamed slag, it is characterised in that：Including following step
Suddenly：
1）Charging procedure：Electric arc furnaces furnace charge;
2）Melt step：Using electrode energization melting batch, and it is fluxing to furnace charge for 200~800m3/h to adjust oxygen flow；
3）Heating step：Continue oxygen blast, addition calcium carbonate making foamed slag, heating into electric arc furnaces after furnace charge is melting down, to melt temperature
Degree reaches 1570~1590 DEG C, and oxygen flow is 300~500m3/h in heating step；
4）Oxidation step：When melt temperature reaches 1570~1590 DEG C, the oxygen flow for controlling oxygen rifle is 300~800m3/h,
Making foamed slag, decarburization；
Calcium carbonate is added with making foamed slag when melting and having liquid in step stove, enables foamed slag thickness submerged arc completely.
2. a kind of use calcium carbonate according to claim 1 replaces the arc furnace steelmaking process of calcium oxide making foamed slag, its
It is characterised by：Step 1）Before charging, furnace bottom adds calcium carbonate, and the addition of calcium carbonate adds 15 ~ 25Kg for steel per ton.
3. a kind of use calcium carbonate according to claim 1 replaces the arc furnace steelmaking process of calcium oxide making foamed slag, its
It is characterised by：Step 2）The granularity of calcium carbonate is 1 ~ 150mm.
4. a kind of use calcium carbonate according to claim 1 replaces the arc furnace steelmaking process of calcium oxide making foamed slag, its
It is characterised by：Step 2）Calcium carbonate can mix addition with furnace charge, oxidant, carburant.
5. a kind of use calcium carbonate according to claim 1 replaces the arc furnace steelmaking process of calcium oxide making foamed slag, its
It is characterised by：Step 2）It is 1~300kg/ tons of steel to add the gross weight of calcium carbonate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710485761.4A CN107201423A (en) | 2017-06-23 | 2017-06-23 | A kind of use calcium carbonate replaces the arc furnace steelmaking process of calcium oxide making foamed slag |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710485761.4A CN107201423A (en) | 2017-06-23 | 2017-06-23 | A kind of use calcium carbonate replaces the arc furnace steelmaking process of calcium oxide making foamed slag |
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| CN107201423A true CN107201423A (en) | 2017-09-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710485761.4A Pending CN107201423A (en) | 2017-06-23 | 2017-06-23 | A kind of use calcium carbonate replaces the arc furnace steelmaking process of calcium oxide making foamed slag |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1082116A (en) * | 1992-08-10 | 1994-02-16 | 湖南省冶金材料研究所 | Foaming agent for smelting steel in electric arc furnace |
| CN102586541A (en) * | 2012-04-11 | 2012-07-18 | 什邡市三裕锻件有限公司 | Steelmaking method suitable for small power electric arc furnace |
| CN103160641A (en) * | 2011-12-13 | 2013-06-19 | 李华丽 | Foaming agent used in electric furnace steelmaking oxygen fusion |
| CN104946854A (en) * | 2015-06-04 | 2015-09-30 | 什邡市三裕锻件有限公司 | Steel smelting method |
-
2017
- 2017-06-23 CN CN201710485761.4A patent/CN107201423A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1082116A (en) * | 1992-08-10 | 1994-02-16 | 湖南省冶金材料研究所 | Foaming agent for smelting steel in electric arc furnace |
| CN103160641A (en) * | 2011-12-13 | 2013-06-19 | 李华丽 | Foaming agent used in electric furnace steelmaking oxygen fusion |
| CN102586541A (en) * | 2012-04-11 | 2012-07-18 | 什邡市三裕锻件有限公司 | Steelmaking method suitable for small power electric arc furnace |
| CN104946854A (en) * | 2015-06-04 | 2015-09-30 | 什邡市三裕锻件有限公司 | Steel smelting method |
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Application publication date: 20170926 |
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