CN1730674A - Method for moten iron desulfurization using slag of desulfurized molten iron - Google Patents
Method for moten iron desulfurization using slag of desulfurized molten iron Download PDFInfo
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- CN1730674A CN1730674A CNA2005100193768A CN200510019376A CN1730674A CN 1730674 A CN1730674 A CN 1730674A CN A2005100193768 A CNA2005100193768 A CN A2005100193768A CN 200510019376 A CN200510019376 A CN 200510019376A CN 1730674 A CN1730674 A CN 1730674A
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- Prior art keywords
- molten iron
- cao
- slag
- desulfurization
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 137
- 239000002893 slag Substances 0.000 title claims abstract description 73
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 66
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 33
- 230000023556 desulfurization Effects 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 24
- 230000003009 desulfurizing effect Effects 0.000 claims abstract description 19
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 10
- 238000003756 stirring Methods 0.000 claims abstract description 7
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 9
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 9
- 229910052593 corundum Inorganic materials 0.000 claims description 9
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 9
- 229910014813 CaC2 Inorganic materials 0.000 claims description 7
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 6
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 6
- 229910001634 calcium fluoride Inorganic materials 0.000 claims description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 5
- 229910052681 coesite Inorganic materials 0.000 claims description 4
- 229910052906 cristobalite Inorganic materials 0.000 claims description 4
- 239000000377 silicon dioxide Substances 0.000 claims description 4
- 229910052682 stishovite Inorganic materials 0.000 claims description 4
- 229910052905 tridymite Inorganic materials 0.000 claims description 4
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 claims description 3
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 3
- 239000000920 calcium hydroxide Substances 0.000 claims description 3
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 3
- 239000011780 sodium chloride Substances 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims 1
- 229910004298 SiO 2 Inorganic materials 0.000 claims 1
- 238000007599 discharging Methods 0.000 abstract 1
- 229910000831 Steel Inorganic materials 0.000 description 10
- 239000010959 steel Substances 0.000 description 10
- 229910052717 sulfur Inorganic materials 0.000 description 10
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 9
- 239000011593 sulfur Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 8
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 239000012535 impurity Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 238000003723 Smelting Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 235000010216 calcium carbonate Nutrition 0.000 description 1
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 239000002699 waste material Substances 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
- Y02P10/20—Recycling
Landscapes
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention discloses a method for using desulfurizing slag for molten iron desulfurization, which comprises, keeping the desulfurization slag temperature above 600 deg C, charging 80-40 wt% of desulfurization slag into the molten iron, charging 20-60 wt% of CaO-based desulfurizing agent into the molten iron, stirring 8-25 minutes, finally discharging the slag.
Description
Technical Field
The invention relates to a method for smelting by comprehensive utilization in steel production, in particular to a method for desulfurizing molten iron by using desulfurized slag in molten iron desulfurization treatment.
Background
In recent years, various iron and steel enterprises in the world strive for the production technology of clean steel and ultra-clean steel, so that the requirements on the contents of sulfur and phosphorus in the steel are more and more strict, and meanwhile, in order to continuously improve the productivity of a converter, shorten the smelting period and reduce the amount of converter slag, the molten iron desulphurization treatment becomes an indispensable important link for steel mills. However, in the desulfurization treatment of molten iron, the utilization of the desulfurizing agents (CaO, CaCO3, CaC2 and the like) is very low, generally 3-7%, 93-97% of the desulfurizing agents such as CaO and the like in the desulfurized slag do not participate in the desulfurization reaction, the content of CaO in the desulfurized slag reaches about 40%, and the alkalinity of the slag, namely CaO/SiO2The content of Fe in the slag reaches about 4.0, and the content of Fe in the slag reaches about 27 percent, so that the effective elements such as CaO, Fe and the like which do not participate in the reaction are wasted, and the production cost is higher.
In order to reduce the cost of molten iron desulphurization and achieve the purpose of comprehensive utilization, active measures are taken, such as Japanese patent laid-open Nos. 2004-244706 and 2004-76088, and although the method of reusing the desulphurization slag in molten iron desulphurization is achieved, the defects are as follows: molten iron resulfurization is easy to occur, the molten iron desulphurization effect cannot be guaranteed, and desulphurization of the desulphurization slag by utilizing the molten iron is easily influenced by the production process and steel varieties; for example, U.S. Pat. No. 20030177864 discloses a method for preparing desulfurizing slag into a desulfurizing agent in a cold state, but the method has the following disadvantages: the method is limited to the preparation of the KR desulfurizer from the KR desulfurization slag, the application field is narrow, and the newly added desulfurizer is CaO and C, and the C contains higher sulfur, so that the desulfurization slag is limited by steel varieties when used for molten iron desulfurization.
Disclosure of Invention
The invention aims to overcome the defects and provide a method for desulfurizing molten iron by using the molten iron desulphurization slag, which enables the molten iron desulphurization slag to be reused, reduces the addition amount of CaO-based desulphurization agent, reduces the slag amount discharge and reduces the production cost on the premise of meeting the desulphurization effect and various production conditions and steel varieties.
The technical measures for realizing the purpose are as follows:
the method for desulfurizing the molten iron by using the molten iron desulfurization slag comprises the following steps:
1) keeping the temperature of the desulphurization slag above 600 ℃;
2) adding 80-40 wt% of desulfurized slag into molten iron;
3) adding 20-60 weight percent of CaO-based desulfurizer into molten iron;
4) stirring for 8-25 minutes while adding the desulfurized slag and the CaO-based desulfurizer;
5) and (5) deslagging.
The method is characterized in that the CaO-based desulfurizer takes CaO as a main component and CaCO is added as an auxiliary component3、Ca(OH)2、CaC2、CaF2Al or Al slag, Mg, Na2O、NaCl、Al2O3、SiO2One or more of them.
The method is characterized in that CaO accounts for 60-100 weight percent of a CaO-based desulfurizer added into molten iron, and the rest materials added in an auxiliary manner account for 40-0 weight percent of the CaO-based desulfurizer.
The alkalinity of the molten iron added with the desulfurized slag and the CaO-based desulfurizer meets the following relational expression:
the method is characterized in that the total weight percentage of the desulfuration residue and the CaO of the CaO-based desulfurizer added into the molten iron is controlled within the range of 55-82.
When the amount of the CaO-based desulfurizer added into the molten iron is larger than or equal to theamount of the CaO-based desulfurizer which is required to be added when the desulfurized slag is not added, the desulfurized slag is not repeatedly added for use.
The action and reaction mechanism of various CaO-based desulfurizers in molten iron;
CaO: the main preparation of the desulfurization is that,
CaCO3: the effect is the same as that of CaO, except CaCO3Decomposition into CaO and CO at 897 DEG C2Can play a role of gas stirring. The desulfurization effect is better than that of CaO.
Ca(OH)2: action with CaCO3The same is true.
CaC2: principal preparation of desulfurization, CaC2Can be decomposed into free Ca and C, the free Ca and S have strong affinity, and the generated C reacts with oxygen in the molten iron to reduce the oxygen activity in the molten iron, so that the CaC2Has extremely strong desulfurization capability, but CaC2Is relatively expensive.
Na2O: the main preparation of the desulfurization is that,
CaF2: improve the fluidity of the slag and reduce the melting point of the desulphurization slag. Under the condition of certain alkalinity of the desulfurization slag, the CaF in the desulfurization slag2The higher the content, the better the desulfurization effect. If CaF2Too high a content causes severe erosion of the refractory.
Al: and [ O]]Reaction to Al2O3Not only can compensate the temperature loss and reduce the activity of oxygen in the molten iron, Al2O3And can form a low-melting-point complex compound with CaO.
Mg: compensating temperature loss, reducing the activity of oxygen in the molten iron, and reducing the corrosion of refractory materials, the viscosity of the desulphurization slag and improving the desulphurization capability of the desulphurization slag by MgO generated by the reaction of Mg and [ O].
Al2O3、SiO2: forming complex compound with CaO, and reducing the melting point of the desulfurized slag.
Al slag: the main components of the waste slag generated in the process of smelting the metallic aluminum are Al and Al2O3。
NaCl: can lowerLow Al content2O3Melting point of impurities for adsorbing and removing Al in molten iron2O3And (4) inclusion.
The invention has the advantages of meeting the requirements of various production conditions and steel grades, reusing the molten iron desulphurization slag, reducing the addition of CaO-based desulphurization dose, reducing the slag discharge and reducing the production cost.
Detailed Description
Example 1
The desulfurization slag added into the molten iron with the sulfur content of 0.032 comprises the following chemical components in percentage by weight: SiO 22：11.68、CaO：43.47、Al2O3：4.23、MgO：2.38、MnO：0.41、TiO2：0.56、P2O5: 0.06, S: 1.30, T.Fe: 27.03 and the balance unavoidable impurities. The method comprises the following steps:
1) the temperature of the desulphurization slag is kept at 650 ℃;
2) adding 60.00 weight percent of the desulfurized slag into molten iron;
3) adding 40.00 weight percent of CaO-based desulfurizer into the molten iron, wherein the weight percent of CaO accounting for the added amount of the CaO-based desulfurizer is 90.00,
CaF2the weight percentage of the added amount of the CaO-based desulfurizer is 10.00;4) stirring for 12 minutes by adopting a mechanical device while adding the desulfurized slag and the CaO-based desulfurizer;
5) and (5) deslagging.
And (3) detection results: the alkalinity of the molten iron added with the desulfurized slag and the CaO-based desulfurizer is 3.50, the total weight percentage of CaO of the desulfurized slag and the CaO-based desulfurizer is 72.00, and the sulfur content of the desulfurized molten iron is 38 ppm.
Example 2
The desulfurization slag added into the molten iron with the sulfur content of 0.035 weight percent comprises the following chemical components in percentage by weight: SiO 22：10.20、CaO：44.30、Al2O3：4.70、MgO：1.20、MnO：0.60、TiO2：0.38、P2O5：0.10、S: 1.40, T.Fe: 25.20, and the balance inevitable impurities. The method comprises the following steps:
1) the temperature of the sulfur slag is kept at 800 ℃;
2) adding the desulfurized slag with the weight percentage of 75.00 into molten iron;
3) adding 25.00 weight percent of CaO-based desulfurizer into the molten iron, wherein the weight percent of CaO accounting for the added amount of the CaO-based desulfurizer is 100.00;
4) stirring for 10 minutes by adopting a mechanical device while adding the desulfurization slag and the CaO-based desulfurizer;
5) and (5) deslagging.
And (3) detection results: the alkalinity of the molten iron added with the desulfurized slag and the CaO-based desulfurizer is 3.20, the total weight percentage of CaO of the desulfurized slag and the CaO-based desulfurizer is 71.00, and the sulfur content of the desulfurized molten iron is 43 ppm.
Example 3
The desulfurization slag added into the molten iron with the sulfur content of 0.032 comprises the following chemical components in percentage by weight: SiO 22：9.82、CaO：39.76、Al2O3：4.53、MgO：2.84、MnO：0.52、TiO2：0.36、P2O5: 0.05, S: 1.35, T.Fe: 28.31 and the balance inevitable impurities. The method comprises the following steps:
1) the temperature of the desulphurization slag is kept at 860 ℃;
2) adding the desulphurization slag with the weight percentage of 45.00 into molten iron;
3) adding 55.00 weight percent of CaO-based desulfurizer into the molten iron, wherein the weight percent of CaO accounting for 70.00 of the added amount of the CaO-based desulfurizer is CaCO3The weight percentage of the added amount of the CaO-based desulfurizer is 20.00, and the Al slag isThe weight percentage of the added amount of the CaO-based desulfurizer is 10.00,
4) stirring for 15 minutes by adopting a mechanical device while adding the desulfurized slag and the CaO-based desulfurizer;
5) and (5) deslagging.
And (3) detection results: the alkalinity of the molten iron added with the desulfurized slag and the CaO-based desulfurizer is 4.00, the total weight percentage of CaO of the desulfurized slag and the CaO-based desulfurizer is 76.00, and the sulfur content of the desulfurized molten iron is 28 ppm.
Claims (6)
1. The method for desulfurizing the molten iron by using the molten iron desulfurization slag comprises the following steps:
1) keeping the temperature of the desulphurization slag above 600 ℃;
2) adding 80-40 wt% of desulfurized slag into molten iron;
3) adding 20-60 weight percent of CaO-based desulfurizer into molten iron;
4) stirring for 8-25 minutes while adding the desulfurized slag and the CaO-based desulfurizer;
5) and (5) deslagging.
2. The method for desulfurizing molten iron by using the molten iron desulfurization slag according to claim 1, wherein the CaO-based desulfurizing agent is mainly CaO and is additionally added with CaCO3、Ca(OH)2、CaC2、CaF2Al or Al slag, Mg, Na2O、NaCl、Al2O3、SiO2One or more of them.
3. The method for desulfurizing molten iron by using the molten iron desulfurization slag according to claim 1 or 2, wherein the weight percentage of CaO in the CaO-based desulfurizing agent added to the molten iron is 60 to 100, and the weight percentage of the other auxiliary materials is 40 to 0.
4. The method for desulfurizing molten iron using the desulfurized slag according to claim 1, wherein the basicity of the molten iron after the desulfurized slag and the CaO-based desulfurizer are added thereto satisfies the following relational expression:
5. the method for desulfurizing molten iron using the desulfurized slag according to claim 1, wherein the total weight percentage of CaO in the molten iron in which the desulfurized slag and the CaO-based desulfurizing agent are added is controlled within a range of 55 to 82.
6. The method for desulfurizing molten iron using the molten iron desulfurization slag according to claim 1, wherein the desulfurization slag is not repeatedly added when the amount of the CaO-based desulfurization agent added to the molten iron is equal to or greater than the amount of the CaO-based desulfurization agent that is required to be added when the desulfurization slag is not added.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100193768A CN100354435C (en) | 2005-08-31 | 2005-08-31 | Method for moten iron desulfurization using slag of desulfurized molten iron |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100193768A CN100354435C (en) | 2005-08-31 | 2005-08-31 | Method for moten iron desulfurization using slag of desulfurized molten iron |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1730674A true CN1730674A (en) | 2006-02-08 |
| CN100354435C CN100354435C (en) | 2007-12-12 |
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| CNB2005100193768A Expired - Fee Related CN100354435C (en) | 2005-08-31 | 2005-08-31 | Method for moten iron desulfurization using slag of desulfurized molten iron |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107217122A (en) * | 2017-06-21 | 2017-09-29 | 攀钢集团攀枝花钢钒有限公司 | For desulfurizing iron or the composite desulfurizing agent and its process of half steel desulfurization |
| CN107541584A (en) * | 2016-06-24 | 2018-01-05 | 薛富盛 | Treating agent for steelmaking and steelmaking method |
| TWI674321B (en) * | 2016-06-24 | 2019-10-11 | 國立中興大學 | Steelmaking treatment agent and steelmaking method |
| CN112877505A (en) * | 2021-01-14 | 2021-06-01 | 安徽工业大学 | Fluorine-free KR desulfurizer and desulfurization method thereof |
| CN112899428A (en) * | 2021-01-14 | 2021-06-04 | 安徽工业大学 | Method for recycling KR desulfurization slag |
| CN116769996A (en) * | 2023-06-26 | 2023-09-19 | 南京浦江合金材料股份有限公司 | A nickel magnesium spheroidizing agent cored wire |
| CN117070716A (en) * | 2023-09-04 | 2023-11-17 | 攀钢集团西昌钢钒有限公司 | A semi-steel tapping slag washing and desulfurizing agent and its use method |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| TWI408237B (en) * | 2010-12-29 | 2013-09-11 | Univ Nat Chunghsing | Composition of de-sulfur agent for ladle furance of refining process and method for removing sulfur from the molten steel in ladle furnace |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002146421A (en) * | 2000-11-06 | 2002-05-22 | Nippon Steel Corp | Hot metal desulfurizing agent |
-
2005
- 2005-08-31 CN CNB2005100193768A patent/CN100354435C/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107541584A (en) * | 2016-06-24 | 2018-01-05 | 薛富盛 | Treating agent for steelmaking and steelmaking method |
| TWI674321B (en) * | 2016-06-24 | 2019-10-11 | 國立中興大學 | Steelmaking treatment agent and steelmaking method |
| CN107217122A (en) * | 2017-06-21 | 2017-09-29 | 攀钢集团攀枝花钢钒有限公司 | For desulfurizing iron or the composite desulfurizing agent and its process of half steel desulfurization |
| CN112877505A (en) * | 2021-01-14 | 2021-06-01 | 安徽工业大学 | Fluorine-free KR desulfurizer and desulfurization method thereof |
| CN112899428A (en) * | 2021-01-14 | 2021-06-04 | 安徽工业大学 | Method for recycling KR desulfurization slag |
| CN112877505B (en) * | 2021-01-14 | 2024-05-31 | 安徽工业大学 | Fluorine-free KR desulfurizing agent and desulfurizing method thereof |
| CN116769996A (en) * | 2023-06-26 | 2023-09-19 | 南京浦江合金材料股份有限公司 | A nickel magnesium spheroidizing agent cored wire |
| CN117070716A (en) * | 2023-09-04 | 2023-11-17 | 攀钢集团西昌钢钒有限公司 | A semi-steel tapping slag washing and desulfurizing agent and its use method |
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| Publication number | Publication date |
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| CN100354435C (en) | 2007-12-12 |
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Granted publication date: 20071212 Termination date: 20130831 |