CN102031337A - RH (Relative Humidity) desulfurizer with low melting point - Google Patents
RH (Relative Humidity) desulfurizer with low melting point Download PDFInfo
- Publication number
- CN102031337A CN102031337A CN201010597181.2A CN201010597181A CN102031337A CN 102031337 A CN102031337 A CN 102031337A CN 201010597181 A CN201010597181 A CN 201010597181A CN 102031337 A CN102031337 A CN 102031337A
- Authority
- CN
- China
- Prior art keywords
- sweetening agent
- melting point
- desulfurizer
- low melting
- bao
- Prior art date
- 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.)
- Pending
Links
- 238000002844 melting Methods 0.000 title claims abstract description 25
- 230000008018 melting Effects 0.000 title claims abstract description 25
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 27
- 239000002893 slag Substances 0.000 claims abstract description 11
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 7
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims abstract description 7
- 235000003599 food sweetener Nutrition 0.000 claims description 66
- 239000003765 sweetening agent Substances 0.000 claims description 66
- 229910004261 CaF 2 Inorganic materials 0.000 claims description 14
- 239000000395 magnesium oxide Substances 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 11
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 8
- 239000004568 cement Substances 0.000 claims description 6
- 239000004927 clay Substances 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 239000010456 wollastonite Substances 0.000 claims description 6
- 229910052882 wollastonite Inorganic materials 0.000 claims description 6
- 239000002245 particle 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
- 239000010436 fluorite Substances 0.000 claims description 3
- 239000004571 lime Substances 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 abstract description 15
- 239000010959 steel Substances 0.000 abstract description 15
- 229910001634 calcium fluoride Inorganic materials 0.000 abstract description 4
- QVQLCTNNEUAWMS-UHFFFAOYSA-N barium oxide Inorganic materials [Ba]=O QVQLCTNNEUAWMS-UHFFFAOYSA-N 0.000 abstract description 2
- 239000007788 liquid Substances 0.000 abstract description 2
- 238000009628 steelmaking Methods 0.000 abstract description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract 2
- 229910052681 coesite Inorganic materials 0.000 abstract 2
- 229910052593 corundum Inorganic materials 0.000 abstract 2
- 229910052906 cristobalite Inorganic materials 0.000 abstract 2
- 239000000377 silicon dioxide Substances 0.000 abstract 2
- 235000012239 silicon dioxide Nutrition 0.000 abstract 2
- 229910052682 stishovite Inorganic materials 0.000 abstract 2
- 229910052905 tridymite Inorganic materials 0.000 abstract 2
- 229910001845 yogo sapphire Inorganic materials 0.000 abstract 2
- 230000000694 effects Effects 0.000 abstract 1
- 239000002994 raw material Substances 0.000 abstract 1
- 238000006477 desulfuration reaction Methods 0.000 description 17
- 230000023556 desulfurization Effects 0.000 description 14
- 238000012360 testing method Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000009413 insulation Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 238000007598 dipping method 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
- 230000000052 comparative effect Effects 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
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 229910052750 molybdenum Inorganic materials 0.000 description 2
- 239000011733 molybdenum Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 238000010792 warming Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000008280 blood Substances 0.000 description 1
- 210000004369 blood Anatomy 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000005713 exacerbation Effects 0.000 description 1
- 238000013467 fragmentation Methods 0.000 description 1
- 238000006062 fragmentation reaction Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000004540 process dynamic Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
Landscapes
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses an RH (Relative Humidity) desulfurizer with a low melting point, belonging to the technical field of steel making. The RH desulfurizer is characterized by using CaO-Al2O3 as a basic slag system and adding the components: MgO, BaO, CaF2, SiO2 and the like. The raw materials comprise the following components in percentage: 45-50% of CaO, 20-25% of Al2O3, 10-15% of BaO, 6-8% of MgO, 0-3% of CaF2 and 4% of SiO2. The melting point of the RH desulfurizer is 1200-1300 DEG C. Premelting treatment is carried out before use, and the grain size of the desulfurizer is controlled to be 3-5mm. The RH desulfurizer with the low melting point has the advantages that the desulphurization effect is equal to that of the traditional RH desulfurizer, and the melting point is 200 DEG C lower than the melting point of the traditional RH desulfurizer; and by the addition of BaO, the rate of desulphurization of the desulfurizer is increased, the melting point of the desulfurizer is reduced, and the amount of CaF2 is reduced. As BaO is introduced in the RH desulfurizer, the melting point of the desulfurizer is effectively reduced and is 200 DEG C lower than the melting point of the traditional RH desulfurizer, the melting speed of the desulfurizer is increased, and the temperature drop of liquid steel during RH desulphurization treatment is reduced.
Description
Technical field
The invention belongs to steelmaking technical field, particularly relate to low melting point RH sweetening agent.
Background technology
In the RH sweetening process, the treatment time is short, the mode that generally adopts sweetening agent to add fast.A large amount of addings along with sweetening agent, molten steel is sharply lowered the temperature, be unfavorable for the quick fusing of sweetening agent simultaneously, the viscosity coefficient of dross that generates is very big, even sweetening agent only can partial melting sometimes, thereby cause desulfurization product to the very slow severe exacerbation RH of slag internal delivery process velocity of diffusion sweetening process dynamic conditions.Therefore desulfurization has important meaning for RH to reduce the fusing point of RH sweetening agent.
Now be generally CaO-CaF with sweetening agent with RH
2Slag system and CaO-Al
2O
3The slag system sweetening agent, CaO-CaF
2Slag system, the sweetening agent fusing point is more than 1450 ℃.In actual production, every this sweetening agent of adding 100Kg can cause the cooling of 5 ℃ on molten steel.Just can reach sweetening effectiveness preferably and generally will add this sweetening agent of 600-800Kg in process of production.Therefore cause liquid steel temperature acutely to reduce.CaO-Al
2O
3Slag system sweetening agent fusing point is low but the existenceization slag slow, mobile bad shortcoming.
Summary of the invention
The objective of the invention is: by optimizing CaO, Al
2O
3, MgO, CaF
2And SiO
2Content and the BaO that introduces the high basicity of low melting point to solve the contradiction that realizes between the high burn-off rate of low melting point, invent that a kind of to have a fusing point low, the RH sweetening agent that burn-off rate is fast and desulfurization degree is high.
The present invention seeks to finish like this: it is characterized in that its material composition in weight percent, is with CaO-Al
2O
3Be basic slag system, and add 45%～50%CaO, 20%～25%Al
2O
3, 10%～15%BaO, 6%～8%MgO, 0～3%CaF
2, 4%SiO
2The RH sweetening agent of forming.
The sweetening agent fusing point is 1200 ℃～1300 ℃.
Sweetening agent carries out fritting, and the sweetening agent particle diameter is controlled at 3～5mm after the fritting.
CaF in the material composition
2Weight percent is below 3%.
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 CaF
2Derive from fluorite; Described SiO
2Derive from a kind of or several in wollastonite, quartz sand and the feldspar.
The RH sweetening agent adopts direct addition method.
The present invention is in order to reduce fusing point, rapid slag and to improve mobilely, and our deep research is with CaO-Al
2O
3Be the RH sweetening agent of basic slag system, by optimizing CaO, Al
2O
3, MgO, CaF
2And SiO
2Content and the BaO that introduces the high basicity of low melting point, finally invented a kind of low melting point RH sweetening agent.
The invention has the beneficial effects as follows:
1, introduce BaO in the RH sweetening agent of the present invention and effectively reduce the sweetening agent fusing point, more traditional RH sweetening agent fusing point reduces by 200 ℃, has improved the burn-off rate of sweetening agent, and has alleviated the temperature drop of molten steel when the RH desulfurization is handled.
2, introduce BaO in the RH sweetening agent of the present invention and improved sweetening agent basicity, effectively strengthened the sweetening agent desulfuration efficiency, make the RH desulfuration efficiency improve 5～10% when adopting the sweetening agent vacuum chamber to drop into technology.
3, RH sweetening agent of the present invention has reduced CaF in the sweetening agent
2Consumption, thereby reduced CaF
2To the pollution of environment, simultaneously because CaF
2The reduction of content has alleviated in the RH desulfurization treating processes the corrosion of RH equipment, makes the RH dipping tube life-span improve about 40%.
Embodiment
Below in conjunction with further specifying flesh and blood of the present invention with example, but content of the present invention is not limited to this.
Embodiment 1:
Material composition of the present invention is by weight percentage: 45%～50%CaO, 20%～25%Al
2O
3, 10%～15%BaO, 6%～8%MgO, 0～3%CaF
2, 4%SiO
2
Described sweetening agent mainly contains CaO, Al
2O
3, BaO, MgO, CaF
2, SiO
2Thereby,, thereby reduced CaF wherein because the adding of BaO effectively reduces the sweetening agent fusing point when not reducing the sweetening agent sweetening effectiveness
2Consumption.The RH sweetening agent fusing point of forming according to the said components weight percentage can be reduced to 1200～1300 ℃.According to invention, after the sweetening agent fritting, make the particle that particle diameter is 3～5mm, adopt RH vacuum chamber throw-in play, the RH desulfuration efficiency is reached more than 36%.
Composition all can be the known various materials of this area related personnel in the above-mentioned sweetening agent, and described CaO can derive from a kind of or several in wollastonite, lime, Wingdale and the cement clinker; Described Al
2O
3Can derive from bauxitic clay, cement clinker and the white clay one or more; Described BaO can derive from barite etc.; Described MgO can derive from magnesia; Described CaF
2Can derive from fluorite; Described SiO
2Can derive from a kind of or several in wollastonite, quartz sand and the feldspar;
Above-mentioned fritting and process for granulating can be the known the whole bag of tricks of this area related personnel.Pre-melt can adopt the electric furnace preparation, after allowing with melting charge through water-cooled, fragmentation can obtain pre-melt, the processing parameter during fritting thinks that this area related personnel is in common knowledge, no longer repeats at this.
With 48 gram CaO, 25 gram Al
2O
3, 13 the gram BaO, 7 the gram MgO, 3 the gram CaF
2, 4 the 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 sweetening agent cooling to be melted, both the low melting point RH sweetening agent of this experiment invention.
Recording this sweetening agent fusing point with hemisphere point method is 1220 ℃.
Comparative Examples 1:
60 gram CaO, 40 gram CaF2 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 sweetening agent energising with hemisphere point method is 1436 ℃.
Embodiment 2:
In certain large-scale iron and steel enterprise, be the experiment steel grade with the pipe line 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 9 minutes; It is 18 ℃ that temperature drop is handled in molten steel RH desulfurization; Average RH desulfurization degree can reach 36%; The mean lifetime of RH dipping tube is 58 stoves.
Comparative Examples 2
Adopting same RH equipment with case study on implementation 2 same enterprises, is the test steel grade equally with the pipe line steel, adopts that CaO quality percentage composition is 60%, CaF
2The quality percentage composition is traditional RH sweetening agent of 40%, adopts the sweetening agent vacuum chamber to drop into technology, and 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.
Introduce BaO in the RH sweetening agent of the present invention and effectively reduce the sweetening agent fusing point, more traditional RH sweetening agent fusing point reduces by 200 ℃, has improved the burn-off rate of sweetening agent, and has alleviated the temperature drop of molten steel when the RH desulfurization is handled.
Claims (6)
1. a low melting point RH sweetening agent is characterized in that its material composition in weight percent, is with CaO-Al
2O
3Be basic slag system, and add 45%～50%CaO, 20%～25%Al
2O
3, 10%～15%BaO, 6%～8%MgO, 0～3%CaF
24%SiO
2The RH sweetening agent of forming.
2. low melting point RH sweetening agent according to claim 1 is characterized in that described sweetening agent fusing point is 1200 ℃～1300 ℃.
3. low melting point RH sweetening agent according to claim 1 is characterized in that sweetening agent carries out fritting, and the sweetening agent particle diameter is controlled at 3～5mm after the fritting.
4. low melting point RH sweetening agent according to claim 1 is characterized in that CaF in the material composition
2Weight percent is below 3%.
5. low melting point RH sweetening agent 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 CaF
2Derive from fluorite; Described SiO
2Derive from a kind of or several in wollastonite, quartz sand and the feldspar.
6. the described low melting point RH sweetening agent of claim 1 is characterized in that the RH sweetening agent adopts direct addition method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010597181.2A CN102031337A (en) | 2010-12-20 | 2010-12-20 | RH (Relative Humidity) desulfurizer with low melting point |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010597181.2A CN102031337A (en) | 2010-12-20 | 2010-12-20 | RH (Relative Humidity) desulfurizer with low melting point |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102031337A true CN102031337A (en) | 2011-04-27 |
Family
ID=43884788
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010597181.2A Pending CN102031337A (en) | 2010-12-20 | 2010-12-20 | RH (Relative Humidity) desulfurizer with low melting point |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102031337A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1338525A (en) * | 2001-07-05 | 2002-03-06 | 北京科技大学 | Deeply desulfurizing slag for steel ladle as refining furnace |
| CN101298632A (en) * | 2008-06-30 | 2008-11-05 | 马鞍山中冶钢铁冶金科技实业有限公司 | BaO-containing external slag washing desulfuration refining agent |
| CN101550513A (en) * | 2009-04-22 | 2009-10-07 | 首钢总公司 | A method for fast and deep desulfurization of low-carbon aluminum-killed steel |
| CN101760585A (en) * | 2010-02-03 | 2010-06-30 | 衡阳华菱连轧管有限公司 | Deep-desulphurizing slag system containing BaO and Li2O and method for producing ultralow-sulfur steel by adopting same |
-
2010
- 2010-12-20 CN CN201010597181.2A patent/CN102031337A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1338525A (en) * | 2001-07-05 | 2002-03-06 | 北京科技大学 | Deeply desulfurizing slag for steel ladle as refining furnace |
| CN101298632A (en) * | 2008-06-30 | 2008-11-05 | 马鞍山中冶钢铁冶金科技实业有限公司 | BaO-containing external slag washing desulfuration refining agent |
| CN101550513A (en) * | 2009-04-22 | 2009-10-07 | 首钢总公司 | A method for fast and deep desulfurization of low-carbon aluminum-killed steel |
| CN101760585A (en) * | 2010-02-03 | 2010-06-30 | 衡阳华菱连轧管有限公司 | Deep-desulphurizing slag system containing BaO and Li2O and method for producing ultralow-sulfur steel by adopting same |
Non-Patent Citations (1)
| Title |
|---|
| 《钢铁》 20010331 成国光等 钢液深脱硫精炼工艺的研究 21-22，25 1-6 第36卷, 第3期 2 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103952515B (en) | A kind of iron red mud is used as the recycling method of steelmaking slag agent | |
| CN102051443A (en) | High basicity fluorine-free RH (Ruhrstah-Heraeus) desulfurizer | |
| CN101935740B (en) | White slag refining agent for LF (Ladle Furnace) refining furnace and preparation method thereof | |
| CN103642965B (en) | Silicon-based desulfurization slag-adjusting agent for vanadium and titanium containing molten iron and preparation method and desulfurization slag-adjusting method thereof | |
| CN102296153A (en) | Novel premelting dephosphorization agent for steel making and preparation method thereof | |
| CN102732680A (en) | Pre-smelting type iron calcium aluminate complex dreg dephosphorizing agent as well as preparation and application methods thereof | |
| CN101845536B (en) | Composite molten steel slag washing agent based on LF (ladle furnace) refining waste slag and preparation method thereof | |
| CN100560746C (en) | The synthetic slag that is used for smelting low-silicon steel | |
| CN108085448A (en) | A kind of production method by continuous casting pattern smelting low-sulfur steel in converter directly | |
| CN101545017B (en) | Ladle slag modifying agent | |
| CN102787213A (en) | Aluminium-calcareous premelted refining slag for low-cost steel-making and method for preparing same | |
| CN100494411C (en) | Aluminium calcium strontium composite premelting slag for molten steel secondary-refining | |
| JP2010047823A (en) | Method for producing clean steel by ladle-refining method | |
| CN102787210A (en) | Calcareous premelted composite deoxidation and desulfurization agent for low-cost steel-making and method for preparing same | |
| CN105018678A (en) | Steel-making desulfurizing agent, desulfurizing method thereof and steel making method | |
| CN102031337A (en) | RH (Relative Humidity) desulfurizer with low melting point | |
| CN105200192B (en) | Liquid steel refining slag and its preparation method and application | |
| CN102876840A (en) | Steelmaking siliceous premelting composite deoxidation and desulfurization agent and preparation method thereof | |
| JP2014189838A (en) | Desulfurization treatment method of molten steel | |
| JP2006257518A (en) | Refining flux and production method therefor | |
| CN105177217B (en) | A kind of technique for reducing the converter smelting slag quantity of slag | |
| JP2009256727A (en) | Method for refining molten steel | |
| CN114752731A (en) | RH refining high-efficiency desulfurization method | |
| CN1201023C (en) | Aluminium-calcium composite desulfurizing agent, and producing method and using method thereof | |
| CN112851123A (en) | Method for preparing enstatite/spinel complex-phase glass ceramics by using nickel-iron slag |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20110427 |