CN1312388A - Premelt molten steel cleaning agent - Google Patents
Premelt molten steel cleaning agent Download PDFInfo
- Publication number
- CN1312388A CN1312388A CN 01106402 CN01106402A CN1312388A CN 1312388 A CN1312388 A CN 1312388A CN 01106402 CN01106402 CN 01106402 CN 01106402 A CN01106402 A CN 01106402A CN 1312388 A CN1312388 A CN 1312388A
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- purificant
- cao
- steel
- cleaning agent
- molten steel
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- Treatment Of Steel In Its Molten State (AREA)
Abstract
The composition of premelting molten steel cleaning agent is comprised of (wt%) CaO 50-68, MgO 3-7, Al2O3 12-18, CaF2 8-16, SiO2 4-8, sodium salt 3-5 and metal aluminium 2-4. Said cleaning agent can reduce the oxygen content and impurity content in the steel, and possesses obvious desulfurization power, and the adoption of said cleaning agent can obtain desulfurization rate of 55-75%.
Description
The present invention relates to molten steel purificant in the metallurgical liquid steel refining, specifically a kind of premelt molten steel cleaning agent that can improve desulfurization degree and deoxidizing capacity.
Along with the popularization of strengthening smelting technology and the increase of variety steel requirement, steel is more and more higher to the requirement of sulphur control, and it is particularly important that the desulfurization in the molten steel seems.Traditional sweetening agent mostly is exoslag, and its composition is CaO 58% metallic aluminium 12% FeO 30%, and it is mainly used to reduce temperature loss.Along with the development of smelting technology, provide energy to there is no need with thermite reaction, and FeO is unfavorable for the deoxidation of slag, traditional exoslag desulfurization degree does not reach 50%, more can not play the effect of molten steel deep desulfuration.
The object of the present invention is to provide a kind of pre-molten shaped steel water purificant that has high sweetening power and can reduce the ladle slag oxidisability, make it can reduce oxygen level in the steel, optimization is mingled with behavior.
For achieving the above object, the weight percent of pre-molten shaped steel water purificant composition of the present invention is:
CaO 50-68
MgO 3-7
AL
2O
3 12-18
CaF
2 8-16
SiO
2 4-8
Sodium salt 3-5
Metallic aluminium 2-4
More than each composition weight sum be 100%.
The preferred best composition weight percent of the present invention is:
CaO 54-62
MgO 4-6
AL
2O
3 14-16
CaF
2 10-14
SiO
2 5-7
Sodium salt 3-5
Metallic aluminium 2-4
More than each composition weight sum be 100%.
This purificant is selected the high-quality high calcium for use, high alumina, fluorite and other ancillary component, after being heated to 1500 ℃ of left and right sides slags by electric arc furnace, natural cooling crystallization, moisture content and gas foreign material in traditional slag have effectively been removed, crystalline phase is rearranged form the calcium aluminate xln be rich in CaO, this xln densification is difficult for aquation and makes and increase hydrogen in the steel.Sodium salt and metallic aluminium are to add to mix with it behind the molten cementing crystalline substance of other material again, and this purificant can reach the desulfurization purpose to greatest extent.
Other physical and chemical index of this purificant is: basicity 2.5-3, get angry＜5% melting temperature＜1450 ℃, granularity＜10cm.
The selection of composition of the present invention has taken into full account the composition of slag.Average furnace slag ingredient and the slag amount of bringing big bag into are design basiss of the present invention.The AL that brings into
2O
3AL among available the present invention
2O
3Absorb the SiO that brings into
2Dilute to improve R (CaO/SiO with CaO
2) ratio, the metallic aluminium among the present invention has the ability of excess of oxygen in the balance slag.
CaO among the present invention should reach high basicity or CaO/SiO to greatest extent
2Optimum value be beneficial to desulfurization, if but CaO increase to surpass one delimits, can make the slag retrogradation, and cause the erosion of big Bao Naicai, also need improve tapping temperature.Evidence, the content of CaO are controlled at effectively desulfurization and reduce the content of molten steel inclusion of 50-68%.
AL among the present invention
2O
3AL in content influence flowability and the absorption molten steel
2O
3Ability.Work as AL
2O
3When content increased, the flowability of purificant improved, but absorbed AL
2O
3Ability drop.Big bag finishing slag AL
2O
3Content is chosen as 15-25%, still in purificant, add the AL of 12-18%
2O
3Be in order to improve its flowability and to absorb AL
2O
3, make its AL after use
2O
3Reach about 23%, this is worth at finishing slag AL
2O
3Within the content.Keep higher absorption AL
2O
3Ability, then mobile decline can add an amount of fluorite and make its flowability moderate.
Add proper C aF in the present invention
2Exactly in order to improve liquidity and to reduce the fusing point of purificant, but excessive CaF
2Can cause the erosion of big Bao Naicai to accelerate, so should take all factors into consideration.From adopting the CaF of different amounts
2Test several times see, work as AL
2O
3Content when 12-18%, CaF
2Content need could to guarantee that at 8-16% purificant has good mobility.SiO
2As shoddye, its adding also is for making purificant have better flowability, and they can guarantee that purificant becomes liquid fluid in molten steel, makes that purificant and molten steel are more abundant to be contacted and reaction.Effectively improved sweetening power.
The metallic aluminium of the 2-4% of Jia Ruing is for better deoxidization desulfuration in the present invention.Adding aluminium deoxidation when adopting this purificant can reduce dissolved oxygen content in the molten steel, particularly will be favourable when CaO content reaches 60%.Evidence: the dissolved oxygen of aluminium killed steel is 11PPm, adopts 0.004% aluminium in conjunction with the calcium aluminate purificant, and dissolved oxygen drops to 8PPm from 11PPm, if CaO is increased to 60% from 37% in the cleaning, dissolved oxygen further drops to 3PPm from 8PPm.Desulfurization rate is quickened with deoxidant elements such as Si, Mn and AL.Because CaO is arranged as main sweetening substance, aluminium only adds as auxiliary composition, its add-on has reduced much than 12% in traditional slag, and this greatly reduces the cost and the alloy usage quantity of this purificant.
Facts have proved that the basicity of molten slag is controlled at 2.5-3 and helps desulfurization most.The sodium salt that adds among the present invention is in order to strengthen its alkalescence.MgO in the invention as alkaline matter and sulphur certain binding ability is arranged but not as the CaO bonding force strong, it mainly acts on is to improve the CaO activity.Thereby the raising desulfurization degree, proper addition of MgO can play the effect of the magnesia furnace lining of protection simultaneously, has reduced the dissolution process of furnace lining to slag.But MgO can improve the fusing point of purificant, and its add-on can not be greater than 8%.
In purificant composition of the present invention, since effective desulfurization of CaO, AL
2O
3Make its good fluidity and absorb AL in the slag
2O
3, CaF
2And SiO
2Make it mobile better, sodium salt is regulated basicity, effective deoxidation of metallic aluminium.Rationalization proportioning at above material, under the useful effect, prove through test of many times, when sulphur content in the molten steel between 40-150PPm, when oxygen level is not very high, add this purificant of 5-12 kilogram in the ton steel, all can obtain the desulfurization degree of 55-75%, also reduce the content and the inclusion content of steel water oxygen simultaneously.Well satisfied variety steel to the requirement of the strict control of sulphur and the needs of deep desulfuration.
Embodiment 1:
100 kilograms of this purificant compositions are:
CaO 58Kg
MgO 5Kg
AL
2O
3 15Kg
CaF
2 10Kg
SiO
2 5Kg
Sodium salt 4Kg
Metallic aluminium 3Kg
Prove that through test of many times when converter tapping, sulphur content is 50PPm in the steel, add 6-7 kilogram present embodiment purificant in the ton steel, and stir, can obtain 70% desulfurization degree, make that sulphur content is reduced to 15PPm in the steel with argon gas.
Embodiment 2:
100 kilograms of this purificant compositions are:
CaO 54Kg
MgO 6Kg
AL
2O
3 15Kg
CaF
2 14Kg
SiO
2 5Kg
Sodium salt 4Kg
Metallic aluminium 2Kg
Under the experiment condition identical with embodiment 1, present embodiment can drop to 18PPm from 50PPm with sulphur content in the steel, and desulfurization degree is 64%.
Embodiment 3:
100 kilograms of this purificant compositions are:
CaO 62Kg
MgO 4Kg
AL
2O
3 13Kg
CaF
2 10Kg
SiO
2 5Kg
Sodium salt 4Kg
Metallic aluminium 2Kg
Under the experiment condition identical with embodiment 1, present embodiment can drop to 17PPm from 50PPm with sulphur content in the steel, and desulfurization degree is 66%.
Embodiment 4:
CaO 50Kg
MgO 6Kg
AL
2O
3 18Kg
CaF
2 12Kg
SiO
2 7Kg
Sodium salt 3Kg
Metallic aluminium 4Kg
Under the experiment condition identical with embodiment 1, present embodiment can drop to 20PPm from 50PPm with sulphur content in the steel, and desulfurization degree is 60%.
Embodiment 5:
100 kilograms of this purificant compositions are:
CaO 68Kg
MgO 3Kg
AL
2O
3 12Kg
CaF
2 8Kg
SiO
2 4Kg
Sodium salt 3Kg
Metallic aluminium 2Kg
Under the experiment condition identical with embodiment 1, present embodiment can drop to 17PPm from 50PPm with sulphur content in the steel, and desulfurization degree is 66%.
In sum, the present invention is not only novel, and it is practical, its preferred component proportioning really can make this purificant obtain higher desulfurization degree, and can reduce oxygen level in the steel, optimization is mingled with behavior, has well satisfied the needs of deep desulfuration, its effect is better than other slag agent, has substantial breakthrough in this area.
Claims (2)
1, a kind of pre-molten shaped steel water purificant is characterized in that the weight percent of this purificant composition is:
CaO 50-68
MgO 3-7
AL
2O
3 12-18
CaF
2 8-16
SiO
2 4-8
Sodium salt 3-5
Metallic aluminium 2-4
More than each composition weight sum be 100%.
2, premelt molten steel cleaning agent according to claim 1 is characterized in that the optimum weight per-cent of this purificant composition is:
CaO 54-62
MgO 4-6
AL
2O
3 14-16
CaF
2 10-14
SiO
2 5-7
Sodium salt 3-5
Above each the composition weight sum of metallic aluminium 2-4 is 100%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011064021A CN1146669C (en) | 2001-01-01 | 2001-01-01 | Premelt molten steel cleaning agent |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011064021A CN1146669C (en) | 2001-01-01 | 2001-01-01 | Premelt molten steel cleaning agent |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1312388A true CN1312388A (en) | 2001-09-12 |
| CN1146669C CN1146669C (en) | 2004-04-21 |
Family
ID=4655421
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB011064021A Expired - Fee Related CN1146669C (en) | 2001-01-01 | 2001-01-01 | Premelt molten steel cleaning agent |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1146669C (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100338233C (en) * | 2004-11-17 | 2007-09-19 | 首钢总公司 | Improvement of impurities state in steel from calcium silicate |
| CN102409140A (en) * | 2010-09-26 | 2012-04-11 | 宝山钢铁股份有限公司 | Refined slag used in steel-making process for bearing steel |
| CN104060050A (en) * | 2013-09-16 | 2014-09-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Dephosphorization and desulfurization agent and semisteel simultaneous desulphurization and dephosphorization method |
| CN108118112A (en) * | 2017-12-22 | 2018-06-05 | 马鞍山中科冶金材料科技有限公司 | Calcium and magnesium fritting base aluminum molten steel scavenger and preparation method thereof |
-
2001
- 2001-01-01 CN CNB011064021A patent/CN1146669C/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100338233C (en) * | 2004-11-17 | 2007-09-19 | 首钢总公司 | Improvement of impurities state in steel from calcium silicate |
| CN102409140A (en) * | 2010-09-26 | 2012-04-11 | 宝山钢铁股份有限公司 | Refined slag used in steel-making process for bearing steel |
| CN104060050A (en) * | 2013-09-16 | 2014-09-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Dephosphorization and desulfurization agent and semisteel simultaneous desulphurization and dephosphorization method |
| CN104060050B (en) * | 2013-09-16 | 2016-07-13 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of method of desulfurization dephosphorization agent and half steel desulfurization dephosphorization simultaneously |
| CN108118112A (en) * | 2017-12-22 | 2018-06-05 | 马鞍山中科冶金材料科技有限公司 | Calcium and magnesium fritting base aluminum molten steel scavenger and preparation method thereof |
| CN108118112B (en) * | 2017-12-22 | 2020-11-10 | 马鞍山中科冶金材料科技有限公司 | Calcium-magnesium pre-melting base aluminum molten steel purifying agent and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1146669C (en) | 2004-04-21 |
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