CN104975132A - Method for reducing oxidability of furnace slag by applying electric field - Google Patents
Method for reducing oxidability of furnace slag by applying electric field Download PDFInfo
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- CN104975132A CN104975132A CN201410143183.2A CN201410143183A CN104975132A CN 104975132 A CN104975132 A CN 104975132A CN 201410143183 A CN201410143183 A CN 201410143183A CN 104975132 A CN104975132 A CN 104975132A
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- slag
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- steel
- molten steel
- electric field
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- 239000002893 slag Substances 0.000 title claims abstract description 78
- 238000000034 method Methods 0.000 title claims abstract description 28
- 230000005684 electric field Effects 0.000 title claims abstract description 17
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 49
- 239000010959 steel Substances 0.000 claims abstract description 49
- 238000006243 chemical reaction Methods 0.000 claims abstract description 23
- 230000008569 process Effects 0.000 claims abstract description 13
- 238000010079 rubber tapping Methods 0.000 claims abstract description 11
- 238000006722 reduction reaction Methods 0.000 claims abstract description 10
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 7
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 7
- 239000004571 lime Substances 0.000 claims abstract description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000001301 oxygen Substances 0.000 claims abstract description 5
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 239000003870 refractory metal Substances 0.000 claims description 6
- 239000004927 clay Substances 0.000 claims description 5
- 229910002804 graphite Inorganic materials 0.000 claims description 5
- 239000010439 graphite Substances 0.000 claims description 5
- 239000004568 cement Substances 0.000 claims description 3
- 239000002131 composite material Substances 0.000 claims description 3
- 238000005868 electrolysis reaction Methods 0.000 claims description 3
- 239000004615 ingredient Substances 0.000 claims description 3
- 230000035484 reaction time Effects 0.000 claims description 3
- 238000005275 alloying Methods 0.000 claims description 2
- 239000004567 concrete Substances 0.000 claims description 2
- 239000000470 constituent Substances 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 239000011214 refractory ceramic Substances 0.000 claims description 2
- 238000005245 sintering Methods 0.000 claims description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 abstract 6
- 229910001570 bauxite Inorganic materials 0.000 abstract 2
- 238000009529 body temperature measurement Methods 0.000 abstract 1
- 238000009835 boiling Methods 0.000 abstract 1
- 238000002715 modification method Methods 0.000 abstract 1
- 230000009467 reduction Effects 0.000 description 5
- 238000000354 decomposition reaction Methods 0.000 description 4
- 238000007670 refining Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000003749 cleanliness Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000006477 desulfuration reaction Methods 0.000 description 2
- 230000023556 desulfurization Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- -1 oxonium ion Chemical class 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000010349 cathodic reaction Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003487 electrochemical reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000009847 ladle furnace Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 150000001457 metallic cations Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000009628 steelmaking Methods 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
- Y02P10/10—Reduction of greenhouse gas [GHG] emissions
- Y02P10/134—Reduction of greenhouse gas [GHG] emissions by avoiding CO2, e.g. using hydrogen
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Abstract
The invention provides a method for reducing the oxidability of slag by applying an electric field, boiling steel is discharged from a converter, the steel tapping P is less than or equal to 0.015 percent, the steel tapping temperature is more than 1730 ℃, and the temperature of a hanging tank is controlled at 1660-1700 ℃; adding lime and bauxite into a large tank in the process of slag-stopping and tapping of the converter, wherein the adding amount is controlled to be 2-8 kg of lime per ton of steel and 2-8 kg of bauxite per ton of steel. Before the control of the electrolytic reaction, the temperature measurement and oxygen determination treatment are carried out on the molten steel, then the anode of the electrolytic reaction control device is inserted into the slag on the top of the steel ladle, the cathode is inserted into the molten steel, and a stable direct current electric field is applied to a molten slag molten steel system by a direct current power supply through the anode and the cathode, so that the iron oxide in the slag is subjected to the electrolytic reduction reaction until the FeO in the slag is reduced to the target content. The method can reduce the FeO content of the ladle top slag from about 20 percent to below 1 percent, effectively avoids secondary pollution to molten steel while reducing the oxidability of the slag, and is an economic, clean and environment-friendly top slag modification method.
Description
Technical field
The invention belongs to process for making technical field, particularly relate to a kind of a kind of method utilizing using electric field to reduce slag beneficiation in ladle.
Background technology
In steel-making refining process, the oxidisability (FeO+MnO content, mainly based on FeO) of pushing up slag in ladle has direct impact to molten steel component and steel cleanliness factor.As required harsh high-grade pipe line steel to sulphur content, must control ladle top slag oxidisability before the dark desulfurization of LF refining, general top slag oxidizing need control within 2%, stricter will control within 1.5%, and this just requires to carry out modifying process to top slag before desulfurization.General modification agent all contains aluminium, and the inclusion that after upgrading, in molten steel, meeting output is a large amount of, has a negative impact to steel cleanliness factor.And for production ultra low-carbon steel, general production line is that converter producing goes out rimming steel, reduce the carbon content of molten steel through vacuum refinement.More difficult to pushing up slag upgrading in ladle in this route, existing method for modifying adds modification agent in ladle top slag, provides dynamic conditions by the method for molten steel being carried out to argon bottom-blowing.But be made with a lot of drawback like this, as upgrading after vacuum refinement, will the molten steel oxidation after refining be caused; If upgrading before vacuum refinement, because molten steel oxygen level is high, the oxygen in top slag modifier and molten steel reacts, and upgrading effect is poor.If not upgrading, in casting cycle, the top slag of high oxidative will cause secondary pollution to molten steel.
Summary of the invention
The invention provides a kind of method applying extra electric field reduction slag beneficiation, being intended to the FeO by consuming the DC electric field applied between top slag and molten steel in slag, thus while reduction slag beneficiation, avoid causing secondary pollution to molten steel.
For this reason, the solution that the present invention takes is:
Using electric field reduces a method for slag beneficiation, and it is characterized in that, concrete grammar is:
1, converter terminal controls
Converter goes out rimming steel, uncomfortable whole alloying constituent, and tapping P≤0.015%, tapping temperature > 1730 DEG C, hanging pot temperature controls at 1660-1700 DEG C.
2, push up slag ingredient to control
Converter slag-resisting is tapped, and the lower quantity of slag of strict control, add lime and bauxitic clay to ladle in tapping process, add-on controls at lime 2 ~ 8kg/ ton steel, bauxitic clay 2 ~ 8kg/ ton steel.
3, electrolytic reaction controls
Ladle is transported to electrolysis treatment station, utilizes the electrolytic reaction control device be located at above ladle to apply electric field to slag molten steel system, carry out electrolytic reaction; Its control process is:
First thermometric is carried out to molten steel and determine oxygen process, then the anode be connected on DC power anode is inserted in ladle top slag, control the position of anode in the slag of top, avoid anode to contact with molten steel; Again the negative electrode be connected on DC power cathode is inserted in molten steel through after the slag of top, and guarantee that negative electrode conducting position does not contact with top slag; Then by anode and negative electrode, galvanic current field is applied to slag molten steel system by direct supply, direct current power source voltage controls at 1 ~ 100V, outward current controls at 10 ~ 2000A, electrolytic reaction time controling is within 30min, make ferriferous oxide generation electrolytic reduction reaction in slag, along with electrolytic reaction continue carry out, constantly consume the FeO in slag, until FeO in slag is down to target content.
Described electrolytic reaction control device comprises DC power control device, cathode lifting device, anode, cathode lifting device and negative electrode; The bottom of cathode lifting device is provided with anode, and the bottom of cathode lifting device is provided with negative electrode, and anode is connected with the positive pole of direct supply by wire, and negative electrode is connected with the negative pole of direct supply by wire.
Described anode is refractory metal pottery, graphite or refractory metal, and shape is right cylinder or flat board.
Described negative electrode adopts inside and outside two-layer composite structure, outer for having refractory ceramics, the high temperature resistant cement of insulating property, and internal layer is have the graphite of high temperature resistant conduction property, sintering metal or refractory metal.
The Basic Mechanism that the present invention reduces slag beneficiation is:
Slag ionic theory shows, slag is also a kind of ionogen with ionic conductivity, and it contains negatively charged ion or anion radical (as oxonium ion and conclude the anion radical having oxonium ion), all kinds of metallic cations etc.The theoretical decomposition voltage value of each component in slag, can be recorded by the electromotive force of corresponding galvanic cell, also can be calculated by thermodynamic data and try to achieve.Its principle is: the electric energy needed for compound decomposition is numerically equal to its free energy of formation at constant pressure, but symbol is contrary, that is:
△G
T θ=-nFE
T θ
In formula, E
t θfor the theoretical decomposition voltage under standard state, V; F is Faraday's number, 96487C/mol electronics; N is receiving and losing electrons number in reaction formula; △ G
t θfor the reaction normal free energy change value under constant voltage, J/mol.Slag each component solution voltage is as shown in table 1 as calculated.
The each ingredient breakdown voltage (V) of table 1 slag
| CaO | Al 2O 3 | MgO | MnO | SiO 2 | P 2O 5 | FeO |
| 2.23 | 1.86 | 1.80 | 1.27 | 1.49 | 1.49 | 0.81 |
From electrochemical principle, electrolytic reduction reaction can be there is in the compound in slag (applying direct current electric field, electrode) under the condition of certain electrochemical reaction, and the decomposition voltage of FeO is minimum in the general each composition of slag, preferentially electrolytic reaction can be there is under the effect of extra electric field power.Accordingly, can select to be suitable for the electrical forces that in slag, ferriferous oxide decomposes, make it that electrolytic reduction reaction occurs, see reaction formula 1.
Fe
2++2e=Fe
（L）
If anode selection is inert material, then anode does not participate in electrolytic reaction, obtains O
2, and produce Fe at slag and cathode interface; If reaction formula and the electrode process of surveying electrolytic process during anode selection carbonaceous material are:
2FeO
（L）+C
（S）=2Fe
（L）+CO
2（g）
Specifically can be decomposed into following reaction:
FeO==Fe
2++ O
2-(ionization)
Fe
2++ 2e=Fe
(L)(cathodic reaction)
2O
2-+ C=CO
2(g)+ 4e (anodic reaction)
The present invention utilizes above-mentioned principle exactly, by applying a galvanic current field and make slag ferriferous oxide generation electrolytic reduction react between the anode that is placed in top slag and the negative electrode being placed in molten steel, along with electrolytic reaction continues to carry out, in slag, FeO is constantly consumed, until be down to target content, thus reach reduction slag beneficiation object.
Beneficial effect of the present invention is:
The present invention applies a galvanic current field by the anode of inserting in ladle top slag and molten steel and negative electrode to slag molten steel system, ladle top slag FeO content can be down to less than 1% by about 20%, while reduction slag beneficiation, effectively prevent the secondary pollution caused molten steel, is the top slag method for modifying of a kind of economy, cleaning, environmental protection.
Accompanying drawing explanation
Fig. 1 is electrolytic reaction control device using state schematic diagram.
In figure: cathode lifting device 1, anode 2, top slag 3, molten steel 4, ladle 5, cathode lifting device 6, negative electrode 7, DC power control device 8.
Embodiment
As seen from Figure 1, electrolytic reaction control device of the present invention is mainly made up of cathode lifting device 1, anode 2, cathode lifting device 6, negative electrode 7 and DC power control device 8.The bottom of cathode lifting device 1 is provided with a graphite-rod anode 2, and anode 2 is regulated the degree of depth inserting slag 3 by cathode lifting device 1.The bottom of cathode lifting device 6 is provided with the negative electrode 7 of, and negative electrode 7 is the pole of inside and outside two layer composite structure, and outer layer covers has high temperature resistant cement, and inside is graphite rod; Negative electrode 7 is regulated its lifting travel and position by cathode lifting device 6.Anode 2 is connected by the DC power anode of wire with DC power control device 8, and negative electrode is connected by the DC power cathode of wire with DC power control device 8.
During use, cathode lifting device 1 and anode 2 are installed on position, ladle 5 upper left side, cathode lifting device 6 and negative electrode 7 are installed in position, ladle furnace 5 upper right side, by cathode lifting device 1 anode 2 inserted in the top slag 3 in ladle 5, control the position of anode 2 in the slag 3 of top, avoid anode 2 to contact with molten steel 4.By cathode lifting device 6, negative electrode 7 is inserted in molten steel 4 through after the slag 3 of top again, and guarantee that the conducting position of negative electrode 7 does not contact with top slag 3.Then controlled by DC power control device 8 and regulate direct supply, apply galvanic current field by anode 2 and negative electrode 7 pairs of slag molten steel systems, electrolytic reaction time controling is within 30min.
Embodiment adopts 100t ladle, and overall control technique is that converter goes out rimming steel, and tapping temperature is greater than 1730 DEG C, the quantity of slag under strict control, add lime and bauxitic clay to ladle in tapping process, then ladle is transported to electrolysis treatment station, carry out extra electric field and reduce slag beneficiation operation.Embodiment 1-4 main control parameters and implementation result are in table 2.
Table 2 embodiment main control parameters and implementation result table
Claims (4)
1. using electric field reduces a method for slag beneficiation, and it is characterized in that, concrete grammar is:
(1), converter terminal controls
Converter goes out rimming steel, uncomfortable whole alloying constituent, tapping P≤0.015%, tapping temperature > 1730 DEG C, and hanging pot temperature controls at 1660-1700 DEG C;
(2), push up slag ingredient to control
Converter slag-resisting is tapped, the lower quantity of slag of strict control, and add lime and bauxitic clay to ladle in tapping process, add-on controls at lime 2 ~ 8kg/ ton steel, bauxitic clay 2 ~ 8kg/ ton steel;
(3), electrolytic reaction controls
Ladle is transported to electrolysis treatment station, utilizes the electrolytic reaction control device be located at above ladle to apply electric field to slag molten steel system, carry out electrolytic reaction; Its control process is:
First thermometric is carried out to molten steel and determine oxygen process, then the anode be connected on DC power anode is inserted in ladle top slag, control the position of anode in the slag of top, avoid anode to contact with molten steel; Again the negative electrode be connected on DC power cathode is inserted in molten steel through after the slag of top, and guarantee that negative electrode conducting position does not contact with top slag; Then by anode and negative electrode, galvanic current field is applied to slag molten steel system by direct supply, direct current power source voltage controls at 1 ~ 100V, outward current controls at 10 ~ 2000A, electrolytic reaction time controling is within 30min, make ferriferous oxide generation electrolytic reduction reaction in slag, along with electrolytic reaction continue carry out, constantly consume the FeO in slag, until FeO in slag is down to target content.
2. using electric field according to claim 1 reduces the method for slag beneficiation, and it is characterized in that, described electrolytic reaction control device comprises DC power control device, cathode lifting device, anode, cathode lifting device and negative electrode; The bottom of cathode lifting device is provided with anode, and the bottom of cathode lifting device is provided with negative electrode, and anode is connected with the positive pole of direct supply by wire, and negative electrode is connected with the negative pole of direct supply by wire.
3. using electric field according to claim 2 reduces the method for slag beneficiation, it is characterized in that, described anode is refractory metal pottery, graphite or refractory metal, and shape is right cylinder or flat board.
4. using electric field according to claim 2 reduces the method for slag beneficiation, it is characterized in that, described negative electrode adopts inside and outside two-layer composite structure, outer for having refractory ceramics, the high temperature resistant cement of insulating property, internal layer is have the graphite of high temperature resistant conduction property, sintering metal or refractory metal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410143183.2A CN104975132A (en) | 2014-04-10 | 2014-04-10 | Method for reducing oxidability of furnace slag by applying electric field |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410143183.2A CN104975132A (en) | 2014-04-10 | 2014-04-10 | Method for reducing oxidability of furnace slag by applying electric field |
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|---|---|
| CN104975132A true CN104975132A (en) | 2015-10-14 |
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|---|---|---|---|
| CN201410143183.2A Pending CN104975132A (en) | 2014-04-10 | 2014-04-10 | Method for reducing oxidability of furnace slag by applying electric field |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108359769A (en) * | 2018-02-13 | 2018-08-03 | 鞍钢股份有限公司 | Method and device for deoxidizing and alloying silicon oxide-containing material |
| CN108360023A (en) * | 2018-02-13 | 2018-08-03 | 鞍钢股份有限公司 | Method and device for composite deoxidation alloying of aluminum and magnesium |
| CN108411065A (en) * | 2018-02-13 | 2018-08-17 | 鞍钢股份有限公司 | Method and device for manganese alloying by using manganese ore |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4744875A (en) * | 1985-05-21 | 1988-05-17 | The United States Of America As Represented By The United States Department Of Energy | Steel refining with an electrochemical cell |
| 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 |
| CN102719617A (en) * | 2011-03-29 | 2012-10-10 | 鞍钢股份有限公司 | Electrochemical decarbonization method and device for iron-carbon melt |
| CN102912081A (en) * | 2012-10-23 | 2013-02-06 | 鞍钢股份有限公司 | Method for improving cleanliness of steel by treating molten steel with external electric field |
-
2014
- 2014-04-10 CN CN201410143183.2A patent/CN104975132A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4744875A (en) * | 1985-05-21 | 1988-05-17 | The United States Of America As Represented By The United States Department Of Energy | Steel refining with an electrochemical cell |
| 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 |
| CN102719617A (en) * | 2011-03-29 | 2012-10-10 | 鞍钢股份有限公司 | Electrochemical decarbonization method and device for iron-carbon melt |
| CN102912081A (en) * | 2012-10-23 | 2013-02-06 | 鞍钢股份有限公司 | Method for improving cleanliness of steel by treating molten steel with external electric field |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108359769A (en) * | 2018-02-13 | 2018-08-03 | 鞍钢股份有限公司 | Method and device for deoxidizing and alloying silicon oxide-containing material |
| CN108360023A (en) * | 2018-02-13 | 2018-08-03 | 鞍钢股份有限公司 | Method and device for composite deoxidation alloying of aluminum and magnesium |
| CN108411065A (en) * | 2018-02-13 | 2018-08-17 | 鞍钢股份有限公司 | Method and device for manganese alloying by using manganese ore |
| CN108360023B (en) * | 2018-02-13 | 2020-06-23 | 鞍钢股份有限公司 | Method and device for composite deoxidation alloying of aluminum and magnesium |
| CN108359769B (en) * | 2018-02-13 | 2020-06-23 | 鞍钢股份有限公司 | Method and device for deoxidizing and alloying silicon oxide-containing material |
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Application publication date: 20151014 |