CN101134987B - Desulfurizing agent for non-oriented silicon steel - Google Patents
Desulfurizing agent for non-oriented silicon steel Download PDFInfo
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- CN101134987B CN101134987B CN200610030597A CN200610030597A CN101134987B CN 101134987 B CN101134987 B CN 101134987B CN 200610030597 A CN200610030597 A CN 200610030597A CN 200610030597 A CN200610030597 A CN 200610030597A CN 101134987 B CN101134987 B CN 101134987B
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Abstract
The non-oriented silicon steel desulfurizer consists of CaO 45-58 wt%, Al2O3 8-23 wt%, CaF2 15-30 wt%, SiO2 3-8 wt%, Mg 2-6 wt%, C not more than 0.015 wt%. Before it is applied in desulfurizing moltensteel, the silicon steel desulfurizer is surface deactivated via adding organic solvent in 0.3-1.0 wt%. The desulfurizer containing metal Mg has excellent deoxidation function and excellent molten steel desulfurizing effect. The desulfurizer with one hydrophobic protecting layer formed through the deactivation treatment has high damp-proofing effect and high desulfurizing reaction performance.
Description
Technical field
The present invention relates to a kind of sweetening agent, relate in particular to a kind of sweetening agent that is used for non orientating silicon steel is carried out desulfurization, belong to metallurgical field of steel-making.
Background technology
Silicon steel is widely used in power electronics industry, and the core technology of its steelmaking process is the abundant removal of harmful element and the reasonable control of its inclusion, thereby puts the performance that the effect of bringing into play favourable element improves silicon steel before this.Sulphur is a kind of harmful elements for most steel grades.Molten steel is carried out the main method that desulfurization is a sulphur content in the control steel at refining process.
What the tradition sulfur removal technology mainly adopted is ladle furnace technology and powder injection desulphurization technology, and is under non-vacuum condition molten steel to be carried out desulfurization to handle, and the sweetening agent of use is generally (50%～70%) CaO-(30%～50%) CaF
2, i.e. lime-fluorite series; Or (40%～70%) CaO-(10%～20%) CaF
2-(20%～40%) Al
2O
3The mixing slag charge.
Non orientating silicon steel belongs to ultra low-carbon steel, and its desulfurization difficulty is more much bigger than soft steel, in steelmaking process, reduce carbon in the steel as much as possible, nitrogen, oxygen, the content of sulphur.Molten steel at first will carry out vacuum decarburization in the vacuum circulation degassing process handles, and makes that carbon content reaches about 15ppm in the molten steel, then deoxidation of molten steel is handled, and carries out the vacuum desulfurization again and handles, and also will prevent the increase of carbon in the molten steel in the vacuum desulfurization.
The tradition sweetening agent can not satisfy the requirement of non orientating silicon steel desulfurization, because traditional sweetening agent is non-vacuum refinement process, so can cause carburetting (carburetting that the molten steel desulfurizing process causes is at 20ppm), the nitrogen pick-up of molten steel.In addition, be sweetening agent with particulate state lime, in the transportation and the easy moisture absorption of storage process, influence sweetening effectiveness.
Summary of the invention
The object of the present invention is to provide a kind of sweetening agent, sweetening agent under this vacuum condition can effectively be prevented the moisture absorption, the desulfuration efficiency of molten steel is reached more than 40%, and make that molten steel recarburization is controlled at below the 8ppm in the whole sweetening process, the nitrogen pick-up of molten steel is controlled at below the 5ppm.
For achieving the above object, desulfurizing agent for non-oriented silicon steel involved in the present invention, the composition weight percent is:
CaO：45～58；
Al
2O
3：8～23；
CaF
2：15～30；
SiO
2：3～8；
Mg：2～6；
C：≤0.015。
Preferably, the weight percent of CaO is (Wt%): 45～58;
CaF
2Weight percent be (Wt%): 18～30;
The granularity of described desulfurizing agent for non-oriented silicon steel is 3mm～15mm.
Preferable, described sweetening agent need carry out surface passivation before to molten steel desulfurizing handles;
Described Passivation Treatment is the organic solvent that adds weight percent (Wt%) 0.3～1.0 to sweetening agent;
Organic solvent is a silicone oil.
Below be the effect and the qualification explanation thereof of principal element of the present invention:
CaO:45～60 (wt%, below each element identical)
The removal of sulphur is mainly removed by dissolved reaction of Salmon-Saxl in CaO and the steel in the molten steel.Therefore, CaO is the major components of molten steel desulfurizing reaction, must guarantee that its content reaches certain ratio.The too high then sweetening agent of CaO content fusing point is too high in the sweetening agent, is unfavorable for its fusing participation reaction, influences the kinetics of desulphurization reaction, and content is crossed to hang down and then can not effectively be removed sulphur.
Organic solvent is preferably silicone oil: 0.3～1.0wt%,
General sweetening agent does not pass through surface treatment, and the CaO that contains in the sweetening agent runs into malaria and reacts, and makes activated lime become Ca (OH)
2, cause desulfurization performance to reduce greatly, and the CaO easily caking of back that makes moist, stop up feed bin, cause the equipment failure influence to produce and normally carry out.After adding silicone oil, Passivation Treatment has been carried out on the sweetening agent surface, made its surface produce one deck hydrophobic protective layer, the purpose that reach moistureproof, improves reactive desulfurizing agent.
Metal M g:2～6wt%,
The MAGNESIUM METAL particle of handling through surface passivation at high temperature forms magnesium steam, enter behind the molten steel with steel in sulphur have very strong bonding force, its sweetening power is higher than CaO far away.In addition, MAGNESIUM METAL also has very strong deoxidizing capacity, can further reduce the oxygen level in the molten steel, and is highly beneficial to improving sweetening effectiveness.But magnesium and molten steel reaction are relatively fiercer, and too much adding magnesium can have a strong impact on the operation of equipment, and the price of magnesium is higher, and therefore, Mg content is controlled at 2%～6% scope among the present invention.
Al
2O
3：8～23wt％；CaF
2：15～30wt％：
Need in the sweetening agent to add the constituent element of fluxing, combine with CaO and form liquid state, with molten steel generation liquid-liquid reactions, its dynamic conditions will be better than the dynamic conditions of solid-liquid reaction greatly again.The general CaF that adopts in the prior art
2Constituent element makes the erosion of refractory materials increase the weight of as fusing assistant, also causes environmental pollution.The present invention Al
2O
3Cooperate CaF
2Make fusing assistant, this deficiency is improved.Fusing assistant (the Al that added low levels
2O3 and CaF
2), do not reach the purpose of quick fusing, and the fusing assistant of too high amount can cause the deficiency of desulfurization principal constituent CaO content, also influence the work-ing life of refractory materials.Therefore with Al
2O
3Percentage composition be controlled between 8%～23% CaF
2Percentage composition comparatively moderate between being controlled at 18%～30%.
SiO
2：3～8wt％，
SiO
2To reducing the sweetening agent fusing point and promote that the sweetening agent fusing is favourable, but can reduce the basicity of slag simultaneously, influence sweetening effectiveness.It is then unfavorable to reducing the sweetening agent fusing point to cross low levels, influences sweetening effectiveness thereby too high levels then reduces the basicity of slag.SiO in the sweetening agent of the present invention
2Percentage composition be controlled at 3%～8%.
C：≤0.015wt％，
In the technological process of non orientating silicon steel desulfurization, the carbon content in the sweetening agent is strictly to control, and the carburetting of molten steel desulfurizing process control is also closely related with carbon content.Carbon content is low as much as possible in the sweetening agent, strict being controlled at below 0.015%.
Except above-mentioned component is had the qualification, the granularity of sweetening agent is also very important, and particle size is the reactive desulfurizing agent poor performance too greatly then, and the residence time of particle in molten steel is short; And sorbent particle is too small, is drawn into vacuum system easily under the vacuum suction condition, can not participate in reaction, and influence vacuum apparatus, causes equipment failure.It is that 3mm～8mm can guarantee its reactivity that the present invention controls the sweetening agent size range, can not influence vacuum apparatus again.
The invention has the advantages that: containing metal magnesium granules in the sweetening agent makes this sweetening agent possess good deoxygenation function, for molten steel desulfurizing has been created good condition; Desulfurizing agent for non-oriented silicon steel of the present invention is added with organic solvent, can carry out Passivation Treatment to the sweetening agent surface, makes its surface produce one deck hydrophobic protective layer, the purpose that reach moistureproof, improves reactive desulfurizing agent; Mix the sweetening agent that other constituent element is mixed and made into and have good melting properties, fusing point can the desulfurization rapidly reaction at 1330 ± 15 ℃.
Embodiment
Table 1 is the composition weight percent of the sweetening agent of embodiment 1～3.
Table 1
| Embodiment | CaO (Wt％) | SiO 2 (Wt％) | Al 2O 3 (Wt％) | CaF 2 (Wt％) | Mg (Wt％) | C (Wt％) | Silicone oil (Wt%) | Granularity (mm) |
| 1 | 58.0 | 3.0 | 8.0 | 30.0 | 2.0 | 0.015 | 1.0 | 5～12 |
| 2 | 52.7 | 5.3 | 13.7 | 23.6 | 3.9 | 0.012 | 0.64 | 3～10 |
| 3 | 45.0 | 8.0 | 23.0 | 18.0 | 6.0 | 0.014 | 0.30 | 5～15 |
Embodiment 1
The preparation sweetening agent, its weight percent is: CaO:58.0%; SiO
2: 3%; Al
2O
3: 8.0%; CaF
2: 30.0%; Mg:2%; C:0.015%.The sweetening agent granularity is between 5～12mm.
Add silicone oil 1.0%, this sweetening agent is carried out surface passivation handle, make its surface coverage one deck hydrophobic protective layer, possess humidity resistance.
After molten steel was handled through vacuum decarburization, vacuum deaeration, the oxygen in the molten steel was reduced to certain degree, and the sweetening agent that adds this moment among the embodiment 1 carries out vacuum desulfurization processing to molten steel.
Above-mentioned sweetening agent is tested, and test conditions is: molten steel is at 300t RH-KTB station, and initial sulphur content is in 0.0020%-0.0050% (low-sulfur situation) in the molten steel.
Test shows:
Molten steel sulphur content before the RH-MFB desulfurization in refining process is handled is 0.0038%, and after handling through desulfurization, sulphur content reduces to 0.0019% in the molten steel, and desulfuration efficiency is 50.0%; The molten steel recarburization amount is 7ppm in sweetening process, and nitrogen increased amount is 4ppm.
Embodiment 2
The preparation sweetening agent, its weight percent is: CaO:52.7%; SiO
2: 5.3%; Al
2O
3: 13.7%; CaF
2: 23.6%; Mg:3.9%; C:0.012%.The sweetening agent granularity is between 3～10mm.
Add silicone oil 0.64%, this sweetening agent is carried out surface passivation handle, make its surface coverage one deck hydrophobic protective layer, possess humidity resistance.
Test conditions is identical with embodiment 1, does not give unnecessary details one by one at this, and test shows:
Molten steel sulphur content before the RH-MFB desulfurization in refining process is handled is 0.0026%, and after handling through desulfurization, sulphur content reduces to 0.0014% in the molten steel, and desulfuration efficiency is 46.2%; The molten steel recarburization amount is 9ppm in sweetening process, and nitrogen increased amount is 3ppm.
Embodiment 3
The preparation sweetening agent, its weight percent is: CaO:45.0%; SiO
2: 8.0%; Al
2O
3: 23.0%; CaF
2: 18.0%; Mg:6.0%; C:0.014%.The sweetening agent granularity is between 5～15mm.
Add silicone oil 0.30%, this sweetening agent is carried out surface passivation handle, make its surface coverage one deck hydrophobic protective layer, possess humidity resistance.
Test conditions is identical with embodiment 1, does not give unnecessary details one by one at this, and test shows:
Molten steel sulphur content before the RH-MFB desulfurization in refining process is handled is 0.0034%, and after handling through desulfurization, sulphur content reduces to 0.0019% in the molten steel, and desulfuration efficiency is 44.1%; The molten steel recarburization amount is 7ppm in sweetening process, and nitrogen increased amount is 4ppm.
Claims (3)
1. a desulfurizing agent for non-oriented silicon steel is characterized in that, its composition weight percent is:
CaO：45～58；
Al
2O
3：8～23；
CaF
2：18～30；
SiO
2：3～8；
Mg：2～6；
C：≤0.015。
2. desulfurizing agent for non-oriented silicon steel as claimed in claim 1 is characterized in that: the granularity of described desulfurizing agent for non-oriented silicon steel is 3mm～15mm.
3. desulfurizing agent for non-oriented silicon steel as claimed in claim 1 is characterized in that: described sweetening agent need carry out surface passivation before to molten steel desulfurizing handles, and described Passivation Treatment is 0.3～1.0 silicone oil for add weight percent to sweetening agent.
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|---|---|---|---|
| CN200610030597A CN101134987B (en) | 2006-08-30 | 2006-08-30 | Desulfurizing agent for non-oriented silicon steel |
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|---|---|---|---|
| CN200610030597A CN101134987B (en) | 2006-08-30 | 2006-08-30 | Desulfurizing agent for non-oriented silicon steel |
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| CN101134987B true CN101134987B (en) | 2010-05-12 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102199687A (en) * | 2011-04-26 | 2011-09-28 | 攀钢集团钢铁钒钛股份有限公司 | RH vacuum treatment desulfurizing agent used for non-oriented electrical steel, preparation method thereof, and desulfurizing method using same |
| CN102888493A (en) * | 2011-07-18 | 2013-01-23 | 江苏正达炉料有限公司 | Preparation method of passivation magnesium |
| CN102839259A (en) * | 2012-09-25 | 2012-12-26 | 鞍钢股份有限公司 | Method for adding metal magnesium in refining process of vacuum circulating degassing furnace |
| CN103882184B (en) * | 2014-04-03 | 2016-01-27 | 太原钢铁(集团)有限公司 | A kind of efficient lime powder product and production technique |
| CN106544472A (en) * | 2016-10-21 | 2017-03-29 | 湛江盛宝科技有限公司 | Vacuum refining furnace powder injection desulphurization agent and preparation method thereof |
| CN109423535A (en) * | 2017-08-29 | 2019-03-05 | 宝钢特钢有限公司 | A kind of technology of high-temperature alloy vacuum induction melting depth desulfurization |
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| CN1294200A (en) * | 1999-11-02 | 2001-05-09 | 北京科技大学 | Technology for pretreating molten iron inshallow smelting bath by blowing Mg-base desulfurizing agent |
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