CN102424895A - Desulfurizer for molten steel processing, preparation method and application method thereof - Google Patents
Desulfurizer for molten steel processing, preparation method and application method thereof Download PDFInfo
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- CN102424895A CN102424895A CN2011104433249A CN201110443324A CN102424895A CN 102424895 A CN102424895 A CN 102424895A CN 2011104433249 A CN2011104433249 A CN 2011104433249A CN 201110443324 A CN201110443324 A CN 201110443324A CN 102424895 A CN102424895 A CN 102424895A
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- molten steel
- sweetening agent
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Abstract
The invention belongs to the molten steel smelting field, mainly relates to a desulfurizer used for molten steel processing in molten steel refining process, a preparation method and an application method thereof. To solve a technological problem, the invention provides a desulfurizer which is used for molten steel processing and has an obvious desulphurization effect so as to raise the quality of molten steel, increase initial desulfurization rate of molten steel and reduce the desulphurization difficulty. The desulfurizer provided by the invention contains the following chemical components of: by weight, 65-75% of CaO, 10-15% OF CaF2, 11-25% of Al2O3, SiO2 being less than 2.0%, MgO being less than 1.0% and water being less than 0.5%. The desulfurizer provided by the invention can be used to raise the initial desulfurization rate of molten steel, reduce the desulphurization difficulty and realize the purpose of improving the quality of molten steel.
Description
Technical field
The invention belongs to the molten steel field of smelting, the master handles with sweetening agent and preparation method thereof and method of use with relating to the molten steel that is used for the liquid steel refining operation.
Background technology
The kind of molten steel desulfurizer is a lot, is main with Mg, Ca base how, and other composition is mainly SiO
2+ MgO+Al
2O
3Be 25～45%.Sweetening agent is normally by various material mechanically mixing, control size≤3mm, and its fusing point is higher, generally greater than 1300 ℃.The company at contriver place mainly adopts slag steel, slag iron to carry out the Electric furnace steel making operation as raw material, and technical process is electric arc furnace → LF refining furnace → VD refining furnace → continuous casting (or die casting).When electric arc furnace (EBT) is tapped in the steel S content generally between 0.050%～0.080% because the chemical ingredients of slag steel, slag iron is unstable, slag and steel separation difficulty; Part slag iron (as the iron of skimming) sulphur content is higher, and S content reaches more than 0.6% usually, is example to allocate 5～8 tons/stove of iron of skimming in the raw material into; S content MV is about 0.20% when EBT taps, and the contriver belongs to S content≤0.035% in company's desire control steel grade finished product, belongs to the existing working condition of company with the contriver; Be difficult to control S content; In order to expand raw material variety, obtain more senior high-quality steel grade, the contriver provides the tangible molten steel of a kind of sweetening effectiveness to handle and has used sweetening agent.
Summary of the invention
The technical problem that the present invention solved provides the tangible molten steel of a kind of sweetening effectiveness to handle and has used sweetening agent, to improve steel quality, improves the initial desulfurization degree of molten steel, reduces the desulfurization difficulty.
The chemical component weight per-cent of sweetening agent of the present invention is: CaO:65%～75%, CaF
2:: 10%～15%, Al
2O
3: 11%～25%, SiO
2:＜2.0%, MgO＜1.0%, moisture＜0.5%.For reaching the weight requirement of above-mentioned chemical ingredients, can adopt raw materials such as calcium carbide, quickened lime, fluorite, aluminium ash require by weight with addition of, get final product after the mechanically mixing.Wherein, add the aluminium ash and be beneficial to desulfuration operations; Add quickened lime and can reduce steel inclusion.The weight percent of calcium carbide, quickened lime, fluorite, aluminium ash is in the raw material: calcium carbide 45-65%, quickened lime 15-35%, fluorite 3-7%, aluminium ash 10-20%, adopt said ratio can realize the purpose of desulfurization.But consider from cost control, should adopt following weight percent: calcium carbide 45-55%, quickened lime 25-35%, fluorite 3-7%, aluminium ash 10-20%.Further preferred weight percent is: calcium carbide 50%, lime powder 30%, fluorite 5%, aluminium ash 15%.
To melt fast in order using, to improve sweetening effectiveness, can adopt the prefusing temperature of temperature >=1100 ℃ to handle sweetening agent of the present invention before use.Fritting can improve the sweetening agent service efficiency after handling, and the fusing point of various materials in the comprehensive raw material is selected 1100 ℃≤prefusing temperature≤1400 ℃.、
Should be broken into powder or the particle that size range is 3～8mm to raw material after the fritting.In order to practice thrift comminution energy conssumption and cost; In the actually operating, the contriver screens the sweetening agent of particle in the raw material after the fritting greater than 8mm earlier, again it is crushed to designated size; And then come out particle mixing less than 8mm with screening; Promptly get sweetening agent of the present invention, its size range is suitable for the interpolation feeding when being 3～8mm, also help rapid reaction and desulfurization rapidly.
The preparation method of sweetening agent of the present invention is following:
A, require preparation raw material: CaO:65%～75%, CaF according to the chemical ingredients of following weight per-cent
2:: 10%～15%, Al
2O
3: 11%～25%, SiO
2:＜2.0%, MgO＜1.0%, moisture＜0.5%;
B, fritting steps A gained raw mix, prefusing temperature>=1100 ℃ (preferred 1100 ℃≤prefusing temperature≤1400 ℃);
Raw mix size range to 3～8mm after C, the broken fritting gets final product.
The method of use of sweetening agent is: when the LF refining is gone into jar, add sweetening agent 3-5kg/t, when energising once finishes, add the amount of sweetening agent once more according to S content in the steel.The usage quantity of sweetening agent is generally the 5-8kg/t molten steel.Adopt sweetening agent of the present invention can improve the initial desulfurization degree of molten steel, reduce the desulfurization difficulty, realize improving the purpose of steel quality.
Embodiment
The chemical component weight per-cent of sweetening agent of the present invention is: CaO:65%～75%, CaF
2:: 10%～15%, Al
2O
3: 11%～25%, SiO
2:＜2.0%, MgO＜1.0%, moisture＜0.5%.Specifically be to adopt calcium carbide, quickened lime, fluorite and aluminium ash to form for preparation of raw material.The preparation method is: the mixture of first fritting raw material, and prefusing temperature is: 1100 ℃～1400 ℃; Raw mix size range to 3～8mm after the broken then fritting gets final product.The method of use of sweetening agent is: when the LF refining is gone into jar, add sweetening agent 3-5kg/t, when energising once finishes, add the amount of sweetening agent once more according to S content in the steel.The usage quantity of sweetening agent is generally the 5-8kg/t molten steel.Table 1 is the consumption formula table of screening raw material of the present invention.
Table 1 formula table (%)
| Raw material | Prescription 1 | Prescription 2 | Prescription 3 | Prescription 4 |
| Calcium carbide | 30％ | 40％ | 50％ | 60％ |
| Lime | 50％ | 40％ | 30％ | 20％ |
| Fluorite | 5％ | 5％ | 5％ | 5％ |
| The aluminium ash | 15％ | 15％ | 15％ | 15％ |
Press the test recipe table, each appearance amount of joining is prepared burden by 1kg, through each prescription is detected; Find that each prescription gas production rate increases along with the increase of calcium carbide add-on, in addition, prescription 3 is bigger with the activity degree of prescription 4; Can be rapidly and molten steel molten mutually; React fast, can realize desulfurization purpose of the present invention, promptly raw material weight per-cent is: calcium carbide 45-65%, quickened lime 15-35%, fluorite 3-7%, aluminium ash 10-20%.But to allocate the calcium carbide amount into more because of filling a prescription 4, and ton cost that steel consumes is higher, is not suitable for manufacturing auxiliary material and uses, and 3 carries out preliminary commerical test so the present invention preferably adopts to fill a prescription.Be that preferred raw material weight per-cent is calcium carbide 45-55%, quickened lime 25-35%, fluorite 3-7%, aluminium ash 10-20%.
Show through commerical test, use after prescription 3 sweetening agents that the initial desulfurization degree of LF stove reaches 34%, the common heat of ton steel refining time ratio reduces 1min, a ton steel refining power consumption reduces 6.8kWh/t, a ton steel 2～5 yuan/t that can save production cost.
To sum up, adopt technology of the present invention simple, need not to transform on-the-spot technical process, feasibility is strong, and application prospect is wide.
Claims (10)
1. molten steel is handled and is used sweetening agent, and it is characterized in that: chemical component weight per-cent is: CaO:65%～75%, CaF
2: 10%～15%, Al
2O
3: 11%～25%, SiO
2:＜2.0%, MgO＜1.0%, moisture＜0.5%.
2. molten steel according to claim 1 is handled and used sweetening agent, it is characterized in that: the raw material of preparation sweetening agent is calcium carbide, quickened lime, fluorite and aluminium ash.
3. molten steel according to claim 2 is handled and is used sweetening agent; It is characterized in that: the raw material of preparation sweetening agent is calcium carbide, quickened lime, fluorite, aluminium ash, and its weight percent is: 45-65%, quickened lime 15-35%, fluorite 3-7%, aluminium ash 10-20%.
4. molten steel according to claim 3 is handled and is used sweetening agent; It is characterized in that: the raw material of preparation sweetening agent is calcium carbide, quickened lime, fluorite, aluminium ash, and its weight percent is: calcium carbide 45-55%, quickened lime 25-35%, fluorite 3-7%, aluminium ash 10-20%.
5. molten steel according to claim 4 is handled and used sweetening agent, it is characterized in that: the raw material of preparation sweetening agent is calcium carbide, quickened lime, fluorite, aluminium ash, and its weight percent is: calcium carbide 50%, lime powder 30%, fluorite 5%, aluminium ash 15%.
6. molten steel according to claim 1 is handled and is used sweetening agent, and it is characterized in that: the size range of sweetening agent is 3～8mm.
7. the described molten steel of claim 1 is handled the preparation method with sweetening agent, and it is characterized in that: step is following:
A, require preparation raw material: CaO:65%～75%, CaF according to the chemical ingredients of following weight per-cent
2:: 10%～15%, Al
2O
3: 11%～25%, SiO
2:＜2.0%, MgO＜1.0%, moisture＜0.5%;
B, fritting steps A gained raw mix, prefusing temperature >=1100 ℃;
C, the raw mix after the fritting is crushed to size range is 3～8mm.
8. molten steel according to claim 7 is handled the preparation method with sweetening agent, and it is characterized in that: the described prefusing temperature of step B is 1100 ℃-1400 ℃.
9. the described molten steel of claim 1 is handled the method for use with sweetening agent, it is characterized in that: when the LF refining, add each described sweetening agent of claim 1-6.
10. method of use according to claim 8 is characterized in that: the usage quantity of sweetening agent is the 5-8kg/t molten steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104433249A CN102424895A (en) | 2011-12-27 | 2011-12-27 | Desulfurizer for molten steel processing, preparation method and application method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104433249A CN102424895A (en) | 2011-12-27 | 2011-12-27 | Desulfurizer for molten steel processing, preparation method and application method thereof |
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|---|---|
| CN102424895A true CN102424895A (en) | 2012-04-25 |
Family
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| CN2011104433249A Pending CN102424895A (en) | 2011-12-27 | 2011-12-27 | Desulfurizer for molten steel processing, preparation method and application method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115029511A (en) * | 2022-07-19 | 2022-09-09 | 武钢集团昆明钢铁股份有限公司 | Calcium oxide-based desulfurizer for complex vanadium-titanium high-sulfur molten iron injection blowing and application thereof |
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|---|---|---|---|---|
| CN1441068A (en) * | 2002-02-25 | 2003-09-10 | 孙富卿 | Molten mixed slag for refining and desulfurizing steel |
| CN101104874A (en) * | 2006-08-24 | 2008-01-16 | 首钢总公司 | Method for processing refined-smelting ladle furnace deep desulfurization finally slag |
| JP2008063647A (en) * | 2006-09-11 | 2008-03-21 | Jfe Steel Kk | Method for desulfurizing molten steel |
| 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 |
| CN102230049A (en) * | 2011-06-22 | 2011-11-02 | 河北钢铁集团有限公司 | Molten iron desulfurizing agent, preparation method thereof and desulfurization method using molten iron desulfurizing agent |
-
2011
- 2011-12-27 CN CN2011104433249A patent/CN102424895A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1441068A (en) * | 2002-02-25 | 2003-09-10 | 孙富卿 | Molten mixed slag for refining and desulfurizing steel |
| CN101104874A (en) * | 2006-08-24 | 2008-01-16 | 首钢总公司 | Method for processing refined-smelting ladle furnace deep desulfurization finally slag |
| JP2008063647A (en) * | 2006-09-11 | 2008-03-21 | Jfe Steel Kk | Method for desulfurizing molten steel |
| 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 |
| CN102230049A (en) * | 2011-06-22 | 2011-11-02 | 河北钢铁集团有限公司 | Molten iron desulfurizing agent, preparation method thereof and desulfurization method using molten iron desulfurizing agent |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115029511A (en) * | 2022-07-19 | 2022-09-09 | 武钢集团昆明钢铁股份有限公司 | Calcium oxide-based desulfurizer for complex vanadium-titanium high-sulfur molten iron injection blowing and application thereof |
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Application publication date: 20120425 |