CN102051443A - High basicity fluorine-free RH (Ruhrstah-Heraeus) desulfurizer - Google Patents
High basicity fluorine-free RH (Ruhrstah-Heraeus) desulfurizer Download PDFInfo
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- CN102051443A CN102051443A CN201010617119.5A CN201010617119A CN102051443A CN 102051443 A CN102051443 A CN 102051443A CN 201010617119 A CN201010617119 A CN 201010617119A CN 102051443 A CN102051443 A CN 102051443A
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- CN
- China
- Prior art keywords
- desulfurizer
- free
- sweetening agent
- basicity
- floride
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 230000003287 optical effect Effects 0.000 claims abstract description 13
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910000532 Deoxidized steel Inorganic materials 0.000 claims abstract description 3
- 235000003599 food sweetener Nutrition 0.000 claims description 31
- 239000003765 sweetening agent Substances 0.000 claims description 31
- 239000003795 chemical substances by application Substances 0.000 claims description 27
- 230000003009 desulfurizing effect Effects 0.000 claims description 27
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 20
- 239000000395 magnesium oxide Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 10
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 6
- 239000010456 wollastonite Substances 0.000 claims description 6
- 229910052882 wollastonite Inorganic materials 0.000 claims description 6
- 239000004927 clay Substances 0.000 claims description 5
- 239000004568 cement Substances 0.000 claims description 4
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 3
- 239000006004 Quartz sand Substances 0.000 claims description 3
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 3
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims description 3
- 239000010428 baryte Substances 0.000 claims description 3
- 229910052601 baryte Inorganic materials 0.000 claims description 3
- 239000010433 feldspar Substances 0.000 claims description 3
- 239000004571 lime Substances 0.000 claims description 3
- 239000002893 slag Substances 0.000 abstract description 15
- 238000006477 desulfuration reaction Methods 0.000 abstract description 13
- 230000023556 desulfurization Effects 0.000 abstract description 11
- 238000002844 melting Methods 0.000 abstract description 8
- 230000008018 melting Effects 0.000 abstract description 8
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 abstract description 6
- 238000009628 steelmaking Methods 0.000 abstract description 2
- 229910052681 coesite Inorganic materials 0.000 abstract 1
- 229910052906 cristobalite Inorganic materials 0.000 abstract 1
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 239000000377 silicon dioxide Substances 0.000 abstract 1
- 229910052682 stishovite Inorganic materials 0.000 abstract 1
- 229910052905 tridymite Inorganic materials 0.000 abstract 1
- 229910000831 Steel Inorganic materials 0.000 description 14
- 239000010959 steel Substances 0.000 description 14
- 238000007598 dipping method Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 238000009413 insulation Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000003912 environmental pollution Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000007670 refining Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 2
- 241000209456 Plumbago Species 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000011733 molybdenum Substances 0.000 description 2
- 229910052750 molybdenum Inorganic materials 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 238000010792 warming Methods 0.000 description 2
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 229910001570 bauxite Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000008280 blood Substances 0.000 description 1
- 210000004369 blood Anatomy 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 230000033764 rhythmic process Effects 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 238000006557 surface reaction Methods 0.000 description 1
Abstract
The invention discloses a high basicity fluorine-free RH (Ruhrstah-Heraeus) desulfurizer, belonging to the technical field of steelmaking. The high basicity fluorine-free RH desulfurizer is characterized in that with a CaO-Al2O3-SiO2 slag system as a basic slag system, BaO is added to lower a melting point of the desulfurizer and enhance the optical basicity of the desulfurizer to reach 0.83; B2O3 is added to lower the melting point of the desulfurizer and enhance the melting speed of the desulfurizer, and therefore, under the flurorine-free condition, the desulfurizer can be rapidly molten without lowering the optical basicity of the RH desulfurizer; and fluoride which seriously influence the environment and seriously erodes equipment is not contained in a formula, thereby the corrosivity of the desulfurizer is reduced and the service life of the RH equipment is prolonged without the addition of the fluoride. Accordingly, the contradiction among high optical basicity, low melting point and rapid melting speed of the RH desulfurizer under the fluorine-free condition is solved and the efficiency of RH refinement to feeble deoxidized steel desulfurization treatment is enhanced.
Description
Technical field
The invention belongs to steelmaking technical field, is the floride-free RH sweetening agent of a kind of high basicity.
Background technology
Need desulfurizing agent to have high optical basicity in the RH sweetening process and guarantee that desulfurizing agent has preferably desulphurizing ability at thermodynamic condition, thereby require simultaneously the desulfurizing agent fusing point low and can melt fast and satisfy the dynamic conditions of realizing better desulfurized effect.At present, the sweetening agent that uses in the RH refining process mostly is CaO-fluorochemical type sweetening agent, and this class sweetening agent has sulfur capacity height, advantage that the desulfurization thermodynamic condition is good.But in actual production, adopt throw-in play, use this desulfurizing agent when weak dexidized steel being carried out the desulfurization processing, desulfurized effect is poor; And this desulfurizing agent Eroded dipping tube reduces the service life of dipping tube, thereby has improved production cost, affect rhythm of production in addition, the fluoride dust corrodes the vacuum pipe network, affects the service life of equipment, and the environmental pollution that is caused by fluoride is also comparatively serious.Therefore, need to develop a kind of novel few fluorine or floride-free desulfurizing agent, when improve adopting throw-in play a little less than the desulfurized effect of dexidized steel, improve the service life of dipping tube and vacuum pipe network, and alleviate environmental pollution.
Fluorochemical is in sweetening process, do not participate in desulphurization reaction directly, just play the effect of fusing assistant, reduce the viscosity of sweetening agent, its flowability is improved, increased surface reaction speed between the slag steel but the increase of content of fluoride, sweetening agent is to the erosion aggravation of refractory materials, and produces problem such as environmental pollution.
CaO-Al
2O
3-SiO
2Slag system is the floride-free RH desulfurizing agent slag system of people's most study, and it can reduce the fusing point of desulfurizing agent effectively, however because Al
2O
3Adding reduced the optical basicity of desulfurizing agent, and change slag system and can't realize the desulfurizing agent rapid melting, therefore need to increase on the basis of this slag system other components and satisfy RH with the thermodynamics and kinetics condition of desulfurizing agent
B
2O
3Be a kind of highly effective flux, and be applied among the crystallizer protecting residue.There is research to point out B in covering slag
2O
3Addition is 10% when following, and the B2O3 of every increase by 1% can reduce about 25 ℃ of fusion temperature.Also have research to point out B
2O
3Can improve reacting dynamics condition between slag, improve reaction rate between steel-slag, and also have research to find B
2O
3Can accelerate the dissolving of CaO in refining slag, increase CaO activity, improve the desulfuration efficiency to weak dexidized steel.
Summary of the invention:
The objective of the invention is: with CaO-Al
2O
3-SiO
2Thereby slag system is basic slag system has improved desulfurizing agent by adding BaO optical basicity, reduction desulfurizing agent fusing point.By adding B
2O
3Reduce the fusing point of desulfurizing agent, improve the burn-off rate of desulfurizing agent.Thereby solve in the contradiction between the high optical basicity of RH desulfurizing agent and low melting point, the fusing fast under the floride-free condition, improved the efficient that the RH refining is processed weak dexidized steel desulfurization.
High alkalinity of the present invention floride-free RH desulfurizing agent is characterized in that composition is take percentage by weight as 50%～60%CaO, 15%～20%Al
2O
3, 10%BaO, 6%～8%MgO, 3～5%B
2O
3, 4%SiO
2Described CaO derives from a kind of or several in wollastonite, lime, Wingdale and the cement clinker; Described Al
2O
3Derive from bauxitic clay, cement clinker and the white clay one or more; Described BaO comes from barite; Described MgO derives from magnesia; Described B
2O
3Derive from szaibelyite; Described SiO
2Derive from a kind of or several in wollastonite, quartz sand and the feldspar.The sweetening agent optical basicity is lower than 1400 ℃ at 0.83 above sweetening agent fusing point.Adopt direct addition method to handle weak deoxidized steel.
The invention has the beneficial effects as follows:
1, introduces the optical basicity that BaO effectively reduces the sweetening agent fusing point, improved sweetening agent in the RH sweetening agent of the present invention.Make RH sweetening agent fusing point optical basicity when being lower than 1400 ℃ can reach 0.83.
2, introduce B in the RH desulfurizing agent of the present invention
2O
3Improve desulfurizing agent basicity, improved reacting dynamics condition between slag, improved reaction rate between steel-slag, increased CaO activity, promoted the desulfurizing agent rapid melting, improved the desulfuration efficiency to weak dexidized steel.
3, fluoride not in the RH sweetening agent of the present invention, thus the pollution of fluorochemical reduced to environment, alleviated the corrodibility of RH sweetening agent simultaneously, make the RH dipping tube life-span improve about 50%.
Embodiment
Further specify flesh and blood of the present invention with example below, but content of the present invention is not limited to this.
The invention provides a kind of RH desulfurizing agent, the material composition percentage by weight is: 50%～60%CaO, 15%～20%Al
2O
3, 10%BaO, 6%～8%MgO, 3～5%B
2O
3, 4%SiO
2
Each material in the above-mentioned desulfurizing agent composition all can be the known material of this area related personnel, and described CaO can derive from a kind of or several in wollastonite, lime, lime stone and the clinker; Described Al
2O
3Can derive from one or more in bauxite, clinker and the white clay; Described BaO can derive from barite etc.; Described MgO can derive from magnesia; Described B
2O
3Can derive from boromagnesite; Described SiO
2Can derive from a kind of or several in wollastonite, quartz sand and the feldspar;
Case study on implementation 1:
With 55 gram CaO, 16 gram Al
2O
3, 10 gram BaO, 7 gram MgO, 4 gram B
2O
3, 4 gram SiO
2Put into plumbago crucible after mixing with stirrer, in induction furnace, be warming up to 1550 ℃ of insulation 30min, when insulation 10min, 18min and 25min, stir respectively, make component melt-blended evenly with molybdenum bar.Smash to pieces after the desulfurizing agent cooling to be melted, both the floride-free RH desulfurizing agent of the high alkalinity of this experiment invention.
Recording this desulfurizing agent fusing point with hemisphere point method is 1380 ℃, and optical basicity is 0.83.
Comparative Examples 1:
60 gram CaO, 40 gram fluorochemicals are put into plumbago crucible after mixing with stirrer, in induction furnace, be warming up to 1550 ℃ of insulation 30min, when insulation 10min, 18min and 25min, stir respectively, make component melt-blended evenly with molybdenum bar.Smash to pieces after the sweetening agent cooling to be melted, must contrast sweetening agent.
Recording this desulfurizing agent fusing point with hemisphere point method is 1436 ℃, and optical basicity is 0.72.
Case study on implementation 2:
In certain large-scale iron and steel enterprise, serve as the experiment steel grade with electrician's light steel, adopt RH sweetening agent of the present invention, adopt the sweetening agent vacuum chamber to drop into technology, the sweetening agent add-on is the 3Kg/t steel, carries out desulfurization test.Test obtains data and shows: adopt RH sweetening agent of the present invention, RH desulfurization treating processes can reach molecular balance in 8 minutes; Average RH desulfurization degree can reach 38%; The mean lifetime of RH dipping tube is 86 stoves.
Contrast case 2
Adopting same RH equipment with case study on implementation 2 same enterprises, be the test steel grade equally with the pipe line steel, adopt that CaO quality percentage composition is 60%, fluorochemical quality percentage composition is traditional RH sweetening agent of 40%, adopt the sweetening agent vacuum chamber to drop into technology, the sweetening agent add-on is the 3Kg/t steel, carries out desulfurization test.Test obtains data and shows: adopt traditional sweetening agent RH desulfurization treating processes can reach molecular balance in 12 minutes; It is 29 ℃ that temperature drop is handled in molten steel RH desulfurization; Average RH desulfurization degree can reach 27%; The mean lifetime of RH dipping tube is 42 stoves.
Claims (5)
1. the floride-free RH desulfurizing agent of a high alkalinity is characterized in that composition is take percentage by weight as 50%～60%CaO, 15%～20%Al
2O
3, 10%BaO, 6%～8%MgO, 3～5%B
2O
3, 4%SiO
2
2. the floride-free RH sweetening agent of high basicity according to claim 1 is characterized in that described CaO derives from a kind of or several in wollastonite, lime, Wingdale and the cement clinker; Described Al
2O
3Derive from bauxitic clay, cement clinker and the white clay one or more; Described BaO comes from barite; Described MgO derives from magnesia; Described B
2O
3Derive from szaibelyite; Described SiO
2Derive from a kind of or several in wollastonite, quartz sand and the feldspar.
3. the floride-free RH sweetening agent of high basicity according to claim 1 is characterized in that the sweetening agent optical basicity is more than 0.83.
4. the floride-free RH sweetening agent of high basicity according to claim 1 is characterized in that the sweetening agent fusing point is lower than 1400 ℃.
5. the using method of the floride-free RH sweetening agent of the described high basicity of claim 1 is characterized in that: adopt direct addition method to handle weak deoxidized steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010617119.5A CN102051443A (en) | 2010-12-31 | 2010-12-31 | High basicity fluorine-free RH (Ruhrstah-Heraeus) desulfurizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010617119.5A CN102051443A (en) | 2010-12-31 | 2010-12-31 | High basicity fluorine-free RH (Ruhrstah-Heraeus) desulfurizer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102051443A true CN102051443A (en) | 2011-05-11 |
Family
ID=43956240
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010617119.5A Pending CN102051443A (en) | 2010-12-31 | 2010-12-31 | High basicity fluorine-free RH (Ruhrstah-Heraeus) desulfurizer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102051443A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102251074A (en) * | 2011-08-22 | 2011-11-23 | 辽宁天和科技股份有限公司 | Fast deep desulfurization process and deep desulfurization agent used after RH refining |
| CN102251075A (en) * | 2011-08-22 | 2011-11-23 | 辽宁天和科技股份有限公司 | Refined, rapid and deep desulfurizing agent and preparation method of same |
| CN103849712A (en) * | 2014-03-19 | 2014-06-11 | 武汉钢铁(集团)公司 | Fluoride-free refining slag for 20 Cr structural alloy steel and preparation method thereof |
| CN110468255A (en) * | 2019-09-06 | 2019-11-19 | 鞍钢股份有限公司 | A kind of free-floride KR desulfurizing agent and its preparation, application method |
| CN111575442A (en) * | 2020-05-29 | 2020-08-25 | 鞍钢股份有限公司 | Low-melting-point high-efficiency desulfurizing agent and preparation and application methods thereof |
| CN112011684A (en) * | 2020-08-25 | 2020-12-01 | 武汉钢铁有限公司 | Preparation method of iron-containing dust and mud pellets |
| CN112877505A (en) * | 2021-01-14 | 2021-06-01 | 安徽工业大学 | Fluorine-free KR desulfurizer and desulfurization method thereof |
| CN114309508A (en) * | 2021-12-30 | 2022-04-12 | 河南通宇冶材集团有限公司 | CaO-BaO-MgO-Al2O3Quaternary slag system tundish covering agent and preparation method thereof |
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2010
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102251074A (en) * | 2011-08-22 | 2011-11-23 | 辽宁天和科技股份有限公司 | Fast deep desulfurization process and deep desulfurization agent used after RH refining |
| CN102251075A (en) * | 2011-08-22 | 2011-11-23 | 辽宁天和科技股份有限公司 | Refined, rapid and deep desulfurizing agent and preparation method of same |
| CN103849712A (en) * | 2014-03-19 | 2014-06-11 | 武汉钢铁(集团)公司 | Fluoride-free refining slag for 20 Cr structural alloy steel and preparation method thereof |
| CN110468255A (en) * | 2019-09-06 | 2019-11-19 | 鞍钢股份有限公司 | A kind of free-floride KR desulfurizing agent and its preparation, application method |
| CN111575442A (en) * | 2020-05-29 | 2020-08-25 | 鞍钢股份有限公司 | Low-melting-point high-efficiency desulfurizing agent and preparation and application methods thereof |
| CN111575442B (en) * | 2020-05-29 | 2021-10-22 | 鞍钢股份有限公司 | Low-melting-point high-efficiency desulfurizing agent and preparation and application methods thereof |
| CN112011684A (en) * | 2020-08-25 | 2020-12-01 | 武汉钢铁有限公司 | Preparation method of iron-containing dust and mud pellets |
| CN112877505A (en) * | 2021-01-14 | 2021-06-01 | 安徽工业大学 | Fluorine-free KR desulfurizer and desulfurization method thereof |
| CN114309508A (en) * | 2021-12-30 | 2022-04-12 | 河南通宇冶材集团有限公司 | CaO-BaO-MgO-Al2O3Quaternary slag system tundish covering agent and preparation method thereof |
| CN114309508B (en) * | 2021-12-30 | 2024-04-02 | 河南通宇冶材集团有限公司 | CaO-BaO-MgO-Al 2 O 3 Quaternary slag system tundish covering agent and its preparation method |
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Application publication date: 20110511 |