CN102719617A - Electrochemical decarburization method for iron-carbon melts and apparatus thereof - Google Patents
Electrochemical decarburization method for iron-carbon melts and apparatus thereof Download PDFInfo
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- CN102719617A CN102719617A CN2011100778743A CN201110077874A CN102719617A CN 102719617 A CN102719617 A CN 102719617A CN 2011100778743 A CN2011100778743 A CN 2011100778743A CN 201110077874 A CN201110077874 A CN 201110077874A CN 102719617 A CN102719617 A CN 102719617A
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Abstract
The invention provides an electrochemical decarburization method for iron-carbon melts and an apparatus thereof. The method comprises 1). filling the iron-carbon melts in a furnace body and adding slag charges with a controlled amount; 2). enabling a cathode to contact with slag through a cathode elevating mechanism; 3). applying a direct-current electric field by an external direct-current power supply through a cathode inserted in the slag and an anode disposed in the iron-carbon melts, and carrying outweak bottom-blowing gas stirring. The apparatus consists of the furnace body, iron-carbon melts in the furnace body and slag in an upper layer of the furnace body, a cathode and an anode which are connected with the external direct-current power supply. The cathode is contacted with the slag in the upper layer of the furnace body through an elevating mechanism, and the anode is contacted with the iron-carbon melts in a lower layer of the furnace body. The apparatus is simple and convenient for operation. The decarburization method is in no need of supplying a large amount of oxygen to a molten pool and in no need of carrying out a deoxidation operation, and an electrochemical decarburization which is low in cost, fast and pollution-free, can be carried out only by applying a direct-current electric field between the iron-carbon melts and the slag.
Description
Technical field
The invention belongs to metallurgical technology field, relate in particular to the method and the device of a kind of suitable iron carbon melt electrochemistry decarburization.
Background technology
Traditional decarbonization method is that oxygen is infeeded the molten bath, with the oxidation of coal in the iron carbon melt.In reaction process, carbon and oxygen in the molten bath react, and the CO gas of generation is discharged from the molten bath with bubble form.The decarburizing reaction process generally is made up of following link:
1) carbon by metal inside to metal/gas phase interface transmission;
2) at metal vapour phase interface generation chemical reaction;
3) gaseous product is moved to gas phase slag phase interface by the metal vapour phase interface;
4) at gas phase slag phase interface generation chemical reaction;
5) transmission of ferriferous oxide in slag phase frictional belt;
6) ferriferous oxide transmits in mutually at slag.
After decarburization finished, retaining in the molten bath had excessive oxygen, and therefore also need add a large amount of reductors carries out deoxidation treatment to melt.This just brings a series of adverse influences, for example uses reductor can increase smelting cost, and to steelmaking system, deoxidation products also can cause continous casting sprue to stop up, and deoxidation products also can cause cold rolled sheet surface quality problems or the like.So in order to meet low-carbon (LC), environmental protection, cheaply under the condition of production, to be badly in need of seeking other cleaning, pollution-free, decarbonization method cheaply.
Summary of the invention
The objective of the invention is to overcome the existing in prior technology defective, a kind of cleaningization, low cost are provided, are applicable to the electrochemical pollution-free decarbonization method and the device of iron carbon melt.
The electrochemistry decarbonization method of iron carbon melt of the present invention may further comprise the steps: 1) the iron carbon melt is packed in the body of heater, add slag charge again, and control its add-on, making its fusing back thickness is 30～150mm; 2), negative electrode is contacted get along well the contact of iron carbon melt with slag through the negative electrode hoisting appliance according to sinter thickness; 3) by the negative electrode and the anode that place iron carbon melt of external dc power through the insertion slag, applying a direct current voltage is 0.1～20V, and current density is 10～2000A/m
2Electric field, carry out weak bottom blown gas simultaneously and stir, strengthening dissolved carbon, the mass transfer of oxygen in melt, and control bottom blown gas flow is 1～50NLmin
-1, flow is excessive to cause the slag blanket fluctuation big, causes the voltage, the electric current that apply unstable, influences the decarburization effect.
It is rare gas element that gas is stirred in weak bottom blowing of the present invention, can be Ar or N
2
Slag charge of the present invention should have suitable basicity (CaO+MgO)/(SiO
2+ Al
2O
3) be 0.8～1.5, the viscosity in the time of its 1500 ℃ is 0.05～2PaS, and has high specific conductivity, FeO content weight percent is 1%～10% in the slag charge.
Iron carbon melt electrochemistry of the present invention decarburization is made up of slag, negative electrode, anode and the direct supply on iron carbon melt in the body of heater that has bottom-blown air brick and induction coil, the stove and upper strata thereof with device; Said negative electrode is connected with external dc power through lead with anode; Negative electrode can contact with the slag on upper strata in the stove through the negative electrode hoisting appliance; Anode is installed in bottom of furnace body, contacts with the iron carbon melt of lower floor in the stove.
Iron carbon melt electrochemistry of the present invention decarburization is made up of negative electrode lifting support support, negative electrode lifting support and cathode carrier with the described negative electrode hoisting appliance of device; The negative electrode lifting support is processed by metallic substance; Top links to each other with negative electrode lifting support support; The lower end is equipped with cathode carrier, and described negative electrode has several, and parallel vertical is arranged on the cathode carrier.Negative electrode of the present invention is processed by refractory metal material or metallic conduction stupalith; Described anode is processed by pyroceramic, refractory metal or with the close consumable electrode of iron carbon melt composition.
Principle of the present invention is:
The electrochemistry decarburizing reaction of iron carbon melt is accomplished through following reaction, and oxygen is in the reaction at gas phase/slag interface
O
2+2e
-＝O
2- (1)
Reaction at slag/metal melt interface does
2(O
2-)+2C＝2CO+4e
- (2)
2(O
2-)+C＝CO
2+4e
- (3)
In oxidizing atmosphere
2CO+O
2＝2CO
2 (4)
Along with the carrying out of reaction, because O in the slag
2-Move; Oxonium ion from gas phase/slag interfacial migration to slag/the metal melt interface; Interface in slag/slag frictional belt has accumulated unnecessary positive charge; And the unnecessary electronics of accumulation is understood because of the carrying out of reaction formula (2), (3) in slag frictional belt/metal melt interface, so formed an electric field in the slag frictional belt, its existence can hinder O
2-Ion continues by the diffusion of slag through the frictional belt.After reaction proceeds to a certain degree, O
2-Electrical forces and diffusive force that ion is suffered reach balance, at this moment O
2-Ion just stops to the migration of reaction interface, thereby the decarburizing reaction between slag and metallic particles has just been stopped when not reaching thermodynamic(al)equilibrium.In system, introduce a reversed electric field, eliminate the electrical forces that hinders oxygen ions migrate, the decarburizing reaction between slag and metallic particles is proceeded down, until reaching thermodynamic equilibrium state.
The present invention has following obviously advantage: present method only needs between iron carbon melt and slag, to apply a direct current electric field, can realize the electrochemistry decarburization of melt; Decarburizing reaction need not to infeed a large amount of oxygen to the molten bath, avoids the peroxo-of melt, also need not to carry out extra deoxidation operation, has practiced thrift a large amount of reductors.Present device is simple; Easy to operate, with low cost, need not to increase independent refining station; Need not to prolong the refining treatment time, only needing on the basis of existing refining unit, to be equipped with simple equipment can carry out low cost, quick, free of contamination decarburization to the iron carbon melt.
Description of drawings
Fig. 1 is the structural representation of electrochemistry decarburization of the present invention with device.
1 is negative electrode lifting support support among the figure, and 2 is induction coil, and 3 is slag, and 4 is body of heater, and 5 is the iron carbon melt, and 6 is bottom-blown air brick, and 7 is the negative electrode lifting support, and 8 is cathode carrier, and 9 is negative electrode, and 10 is external dc power, and 11 is anode.
Embodiment
Through embodiment the present invention is done further description below.
The embodiment of the invention joins 30～50Kg iron carbon melt 5 (concrete bath composition is seen table 1) in the body of heater 4 that has bottom-blown air brick 6 and induction coil 2; Treat that melt 5 melts the back fully and adds slag charge to the molten bath; After treating that slag charge melts fully, measure the thickness of slag 3, sinter thickness is controlled at 30～150mm; Behind slag 3 and iron carbon melt 5 molecular balances; Again iron carbon melt 5 is carried out thermometric and handle, fall negative electrode 9 through the negative electrode hoisting appliance of forming by negative electrode lifting support support 1, negative electrode lifting support 7 and cathode carrier 8 then, apply electric field iron carbon melt 5 is carried out the electrochemistry carbonization treatment.Among the embodiment, 6 negative electrodes 9 are installed on the arc-spark stand 8, negative electrode 9 is made by the sintering metal that contains molybdenum.According to the decline degree of depth of the gauge control negative electrode 9 of slag 3, guarantee that negative electrode 9 contacts with slag 3 and iron carbon melt 5 contacts of getting along well.By the negative electrode 9 and the anode 11 that place bottom of furnace body of external dc power 10 through insertion slag 3, applying a direct current voltage is 0.1～10V then, and electric current is the electric field of 0.1～100A.The used anode 11 of embodiment is made by the sintering metal that contains molybdenum.In applying the electric field process, carry out weak argon bottom-blowing through bottom-blown air brick 6 and stir, flow is 1～50NLmin
-1The embodiment of the invention is implemented on the 50Kg multifunctional furnace of laboratory, and concrete technology and effect are seen table 2.
The chemical ingredients of table 1 embodiment of the invention iron carbon melt
| Embodiment | C，％ | Fe，％ | Si，％ | Mn，％ | P，％ | S，％ |
| 1 | 4.36 | 95.05 | 0.33 | 0.071 | 0.047 | 0.036 |
| 2 | 1.05 | 97.38 | 0.53 | 0.15 | 0.013 | 0.012 |
| 3 | 0.10 | 98.87 | 0.11 | 0.23 | 0.017 | 0.015 |
Table 2 embodiment of the invention iron carbon melt electrochemistry decarbonization process and effect
Claims (6)
1. the electrochemistry decarbonization method of an iron carbon melt is characterized in that may further comprise the steps: 1) the iron carbon melt is packed in the body of heater, add slag charge again, and control its add-on, making its fusing back thickness is 30～150mm; 2), negative electrode is contacted get along well the contact of iron carbon melt with slag through the negative electrode hoisting appliance according to sinter thickness; 3) by the negative electrode and the anode that place iron carbon melt of external dc power through the insertion slag, applying a direct current voltage is 0.1～20V, and current density is 10～2000A/m
2Electric field, carry out weak bottom blown gas simultaneously and stir.
2. the electrochemistry decarbonization method of iron carbon melt according to claim 1 is characterized in that (CaO+MgO)/(SiO in the said slag charge
2+ Al
2O
3) be 0.8～1.5, FeO content weight percent is 1%～10%, the viscosity in the time of its 1500 ℃ is 0.05～2PaS.
3. the electrochemistry decarbonization method of iron carbon melt according to claim 1 is characterized in that it is rare gas element that gas is stirred in described weak bottom blowing, and gas flow is 1～50NLmin
-1
4. device is used in a claim 1,2 or 3 said iron carbon melt electrochemistry decarburizations; It is characterized in that this device is made up of slag, negative electrode, anode and the direct supply on iron carbon melt in the body of heater that has bottom-blown air brick and induction coil, the stove and upper strata thereof; Said negative electrode is connected with external dc power through lead with anode; Negative electrode can contact with the slag on upper strata in the stove through the negative electrode hoisting appliance, and anode is installed in bottom of furnace body, contacts with the iron carbon melt of lower floor in the stove.
5. device is used in iron carbon melt electrochemistry according to claim 4 decarburization; It is characterized in that described negative electrode hoisting appliance is made up of negative electrode lifting support support, negative electrode lifting support and cathode carrier; The negative electrode lifting support is processed by metallic substance, goes up to link to each other with negative electrode lifting support support, links to each other with cathode carrier down; Described negative electrode has several, and parallel vertical is arranged on the cathode carrier.
6. device is used in iron carbon melt electrochemistry according to claim 4 decarburization, it is characterized in that described negative electrode processed by refractory metal material or metallic conduction stupalith; Described anode is processed by pyroceramic, refractory metal or with the close consumable electrode of iron carbon melt composition.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102899451A (en) * | 2012-10-23 | 2013-01-30 | 鞍钢股份有限公司 | Pre-melting slag used for electrochemical decarburization and preparation method thereof |
| CN104975132A (en) * | 2014-04-10 | 2015-10-14 | 鞍钢股份有限公司 | Method of reducing oxidability of furnace slag with application of electric field |
| CN108396108A (en) * | 2017-02-05 | 2018-08-14 | 鞍钢股份有限公司 | A method of producing mild steel using induction furnace |
| TWI704232B (en) * | 2019-04-11 | 2020-09-11 | 日商日本製鐵股份有限公司 | Method for refining molten iron alloy excellent in efficiency |
| CN113385527A (en) * | 2021-05-31 | 2021-09-14 | 山东大学 | Method and device for repairing heavy metal contaminated soil suspension by adopting pulse current |
| EP4265743A4 (en) * | 2021-02-10 | 2024-05-15 | JFE Steel Corporation | Method for desulfurizing molten metal |
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| CN1712871A (en) * | 2005-06-30 | 2005-12-28 | 东北大学 | DC arc induction furnace |
| CN101235430A (en) * | 2008-02-29 | 2008-08-06 | 上海大学 | Impressed electric field pollution-free deoxygenation refining method and device for ladle furnace |
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2011
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| CN1712871A (en) * | 2005-06-30 | 2005-12-28 | 东北大学 | DC arc induction furnace |
| CN101235430A (en) * | 2008-02-29 | 2008-08-06 | 上海大学 | Impressed electric field pollution-free deoxygenation refining method and device for ladle furnace |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102899451A (en) * | 2012-10-23 | 2013-01-30 | 鞍钢股份有限公司 | Pre-melting slag used for electrochemical decarburization and preparation method thereof |
| CN102899451B (en) * | 2012-10-23 | 2015-09-02 | 鞍钢股份有限公司 | A kind of electrochemical decarburization pre-melted slag and preparation method thereof |
| CN104975132A (en) * | 2014-04-10 | 2015-10-14 | 鞍钢股份有限公司 | Method of reducing oxidability of furnace slag with application of electric field |
| CN108396108A (en) * | 2017-02-05 | 2018-08-14 | 鞍钢股份有限公司 | A method of producing mild steel using induction furnace |
| TWI704232B (en) * | 2019-04-11 | 2020-09-11 | 日商日本製鐵股份有限公司 | Method for refining molten iron alloy excellent in efficiency |
| EP4265743A4 (en) * | 2021-02-10 | 2024-05-15 | JFE Steel Corporation | Method for desulfurizing molten metal |
| CN113385527A (en) * | 2021-05-31 | 2021-09-14 | 山东大学 | Method and device for repairing heavy metal contaminated soil suspension by adopting pulse current |
| CN113385527B (en) * | 2021-05-31 | 2022-04-01 | 山东大学 | Method and device for repairing heavy metal contaminated soil by adopting pulse current |
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Application publication date: 20121010 |