CN106591538A - Environmental-protecting and energy-saving premelting refining slag conditioning agent - Google Patents
Environmental-protecting and energy-saving premelting refining slag conditioning agent Download PDFInfo
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- CN106591538A CN106591538A CN201611094859.9A CN201611094859A CN106591538A CN 106591538 A CN106591538 A CN 106591538A CN 201611094859 A CN201611094859 A CN 201611094859A CN 106591538 A CN106591538 A CN 106591538A
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- Prior art keywords
- slag
- refining
- conditioning agent
- energy
- refining slag
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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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Classifications
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/02—Compacting only
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/10—Alloys containing non-metals
- C22C1/1094—Alloys containing non-metals comprising an after-treatment
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C30/00—Alloys containing less than 50% by weight of each constituent
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
- C22C32/001—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with only oxides
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention proposes an environmental-protecting and energy-saving premelting refining slag conditioning agent. The environmental-protecting and energy-saving premelting refining slag conditioning agent comprises the following chemical components in percentage by weight: 20-28% of Al, 29-37% of CaO, 33-41% of Al2O3, MgO not more than 2.5%, SiO2 not more than 2.5%, FeO+MnO not more than 0.7%, S not more than 0.2%, P not more than 0.2%, TiO not more than 0.30%, and H2O not more than 0.7%. The refining slag conditioning agent is premolten beforehand, wherein CaO and Al2O3 are combined to generate a lot of low-melting-point 12CaO-7Al2O3; the melting point of the refining slag conditioning agent is lowered; the slag can be quickly molten at the earlier stage of LF furnace refining; the power supply time is shortened; and the energy is saved; and as aluminum is uniformly distributed in the slag conditioning agent, the earlier deoxidation speed is quicker, and the deoxidation effect is excellent. The refining slag conditioning agent is lower in content of TiO, balances the [Ti] element in molten steel, and has a certain capacity of absorbing the [Ti] element in the molten steel.
Description
Technical field
The invention belongs to technical field of ferrous metallurgy, more particularly to a kind of pre-melted type refine tune for LF stove refine slag making
Slag agent.
Background technology
It is well known that adding a certain amount of aluminum to play a part of crystal grain thinning in steel, toughness is improved, can also be carried
The non-oxidizability of Gao Gang, improves the electromagnetic capability of steel, improves degree before the wearability and fatigue of nitrided steel, improves the corrosion-resistant of steel
Property.Simultaneously because the continuous improvement of the market demand, Aluminum steel kind is increasing in the possession share in steel market, so much
Producer has started to the Produce on a large scale of Aluminum steel kind.
At home in iron and steel enterprise, LF stove furnace outer refining technologies are widely used, and the slag making of LF stoves is then in whole LF
Desulfurization, deoxidation, the submerged arc that bubbles are played in stove refining process, non-metallic inclusion is removed, is changed inclusion morphology, prevents molten steel secondary
The effect such as oxidation and insulation, therefore slag making is undoubtedly of paramount importance link in LF stove refining process.
In the production process of Aluminum steel kind, the slag making of LF stoves mainly adopts alumine and lime, or proportioning in advance
Good lab-prepared refining slag, has difference different manufacturers more.And when using cooperatively using alumine and Calx, refine occurs more
Early stage slugging is difficult, and slag is difficult situation about foaming, and so as to cause LF refining time lengthening, power consumption to increase, rhythm of production is slow,
The problems such as ladle turnaround time extends.And because containing part SiO alumine more2, so cause slag system basicity generally relatively low
And very unstable situation.
Simultaneously Aluminum steel can adopt aluminium-deoxidized mode during LF refining, more and carry out deoxygenation, and slag blanket it
Upper addition aluminum deoxidier, can cause part deoxidizer and air reaction direct oxidation, cause part to waste.Existing synthesis essence
Containing CaF refining slag more2, volume of smoke is produced in refining process, cause outside atmospheric pollution and water pollution, can also etching apparatus.
The content of the invention
The present invention is difficult for existing slag modifier for refining refine early stage slugging, and slag is difficult foaming；Containing CaF2, pollution
The technical problem of environment, proposes that one kind can shorten the LF stokeholds phase slugging time, the slag modifier for refining of power consumption is reduced, while residue adjustment
Agent contains part deoxidizer, plays a part of quick deoxidation and reduce to waste.
In order to achieve the above object, the technical solution used in the present invention is：
A kind of environmental protection and energy saving pre-melted type slag modifier for refining, by weight percentage its chemical composition are：Al：20%-28%, CaO：29%-
37%, Al2O3：33%-41%, MgO≤2.5%, SiO2≤ 2.5%, FeO+MnO≤0.7%, S≤0.2%, P≤0.2%, TiO≤
0.30%, H2O≤0.7%。
Preferably, by weight percentage its chemical composition is：Al：23%-25%, CaO：32%-34%, Al2O3：36%-
38%, MgO≤2%, SiO2≤ 2%, FeO+MnO≤0.5%, S≤0.15%, P≤0.15%, TiO≤0.20%, H2O≤0.5%。
Preferably, slag adjusting agent fusing point≤1300 DEG C.
Preferably, the slag adjusting agent Jing following steps are made, it is by other raw material mix homogeneously in addition to aluminium powder and pre-
It is molten, powder is then ground to, block or spherical finished product is pressed into after aluminium powder is mixed homogeneously with above-mentioned powder.
Preferably, the slag adjusting agent finished product is the spherical of granularity 15-25mm.
Compared with prior art, advantages of the present invention and good effect are：
（1）Slag modifier for refining shifts to an earlier date fritting, wherein CaO and Al2O3With reference to a large amount of Al of low melting point 12CaO 7 of generation2O3, reduce
The fusing point of slag modifier for refining, it is ensured that LF stove refines early stage can Fast Slag Melting, reduce electric power feeding time, energy saving, while eventually
Al in slag2O3Content is stronger for the absorbability of aluminum system field trash, it is ensured that the inclusion removal energy of the slag system 28% or so
Power；
（2）Aluminum containing 20%-23% in slag modifier for refining, can play a part of aluminium deoxidation and reduce in air contact amount, subtract
Waste is lacked, while aluminum heat release in oxidizing process, is a part of heat of slag melting supplement, has further promoted rapid
Slag；
（3）Because aluminum is uniformly distributed in slag adjusting agent, therefore early stage deoxidation speed is very fast and deoxidation effect is good, more manually adds aluminum system
The deoxidation utilization rate of deoxidizer aluminum is improved, and reduces intensity of workers；
（4）Slag composition is stablized, and absorption steel inclusion ability is stronger, and SiO in slag2Content is less, and slag system basicity improves aobvious
Write；
（5）TiO contents are relatively low in slag modifier for refining, [Ti] element in balance molten steel, and with certain [Ti] element in molten steel is absorbed
Ability；
（6）Without CaF2, not to environment, and spherical or bulk is compressed in advance, therefore the dust for producing is also less.
Specific embodiment
In order to be better understood from the present invention, illustrate with reference to embodiment.
Embodiment one：
Domestic certain iron and steel enterprise produces a certain stove in structural alloy steel 40Cr using 100t converters and LF stoves, and the stove Metal Weight is
103t, LF stove inlet temperature is 1511 DEG C, and slag modifier for refining 300kg, Calx 900kg are added after entering the station（CaO content is left 86%
It is right）.Wherein slag modifier for refining, its chemical composition by weight percentage is：Al：20%-22%, CaO：35%-37%, Al2O3：39%-
41%, MgO≤2.5%, SiO2≤ 2.5%, FeO+MnO≤0.7%, S≤0.2%, P≤0.2%, TiO≤0.30%, H2O≤0.7%.System
Standby process：First by other raw material mix homogeneously in addition to aluminium powder and using flat kiln fritting, prefusing temperature is controlled in 1400-
1450 DEG C, then by its crushing grinding into powder（Granularity≤2mm）, after aluminium powder is mixed homogeneously with above-mentioned powder globulate is suppressed
Granule, grain graininess is 15-25mm, fusing point≤1300 DEG C.
After power transmission 13 minutes, slag melts completely（Period is not used the slagging agents such as fluorite）And liquid steel temperature is promoted to 1548
DEG C, lift 37 DEG C of temperature.Find in refining process, LF stove refine early stage white slags are quickly generated, and slag submerged arc foaming effect is good
It is good.Deoxidizer carbide is added during whole LF refining（Main component is CaC2）20kg, deoxidizer early stage is added and produced on a small quantity
White slag, subsequently adds successively, and process is not used aluminum deoxidier.With the slag system that alumine and lime are used before the factory
Relatively（Refining process averagely uses deoxidizer carbide 100kg, aluminum shot 60kg）, deoxidizer usage amount greatly reduces.
At the end of LF stove refines, with being stained with, slag rod is viscous to take slag specimen, and chemical examination slag composition is by mass percentage：Al2O3：
29.03, CaO：62.76, MgO：2.39, MnO：0.052, P2O5：0.033, S：0.21, SiO2：7.37, TFe：0.59, TiO：
0.38, basicity R：8.52.Slag composition is stablized, and absorption steel inclusion ability is stronger, and SiO in slag2Content is less, slag system alkali
Degree improves notable；TiO contents are relatively low in slag modifier for refining, [Ti] element in balance molten steel, absorb in molten steel [Ti] with certain
The ability of element.
Embodiment two：
Domestic certain iron and steel enterprise uses a certain stove in 100t converters and LF stoves production structural alloy steel 42CrMo, the stove Metal Weight
For 105t, LF stoves inlet temperature is 1507 DEG C, and slag modifier for refining 250kg, Calx 950kg are added after entering the station（CaO content is 86%
Left and right）.Wherein slag modifier for refining its chemical composition by weight percentage is：Al：23%-25%, CaO：32%-34%, Al2O3：36%-
38%, MgO≤2%, SiO2≤ 2%, FeO+MnO≤0.5%, S≤0.15%, P≤0.15%, TiO≤0.20%, H2O≤0.5%.Prepare
Process is：First by other raw material mix homogeneously in addition to aluminium powder and using flat kiln fritting, prefusing temperature is controlled in 1400-
1450 DEG C, then by its crushing grinding into powder（Granularity≤2mm）, after aluminium powder is mixed homogeneously with above-mentioned powder globulate is suppressed
Granule, grain graininess is 15-25mm, fusing point≤1300 DEG C.
After power transmission 15 minutes, slag melts completely（Period is not used the slagging agents such as fluorite）And liquid steel temperature is promoted to 1556
DEG C, lift 49 DEG C of temperature.Slag modifier for refining Jing shifts to an earlier date fritting, wherein CaO and Al2O3With reference to a large amount of low melting points 12CaO 7 of generation
Al2O3, reduce the fusing point of slag modifier for refining, it is ensured that LF stove refines early stage can Fast Slag Melting, reduce electric power feeding time, save
The energy.While Al in finishing slag2O3Content is stronger for the absorbability of aluminum system field trash, it is ensured that the slag system 28% or so
Inclusion removal ability.
LF stove refine early stage white slags are quickly generated, and slag submerged arc foaming works well.Add during whole LF refining
Deoxidizer carbide（Main component is CaC2）20kg, deoxidizer early stage is added and produces white slag on a small quantity, is subsequently added successively, and process is not
Using aluminum deoxidier.And compared with the slag system of lime using alumine with before the factory（Refining process is averagely used
Deoxidizer carbide 100kg, aluminum shot 60kg）, deoxidizer usage amount greatly reduces.Because aluminum is uniformly distributed in residue adjustment in slag modifier for refining
In agent, content is 20%-23%, can play a part of aluminium deoxidation and reduce in air contact amount, reduces waste, therefore early stage is de-
Oxygen speed is very fast and deoxidation effect is good.The deoxidation utilization rate for more manually adding aluminum deoxidier aluminum is improved, and reduces work
Personnel labor intensity.Aluminum heat release in oxidizing process simultaneously, is a part of heat of slag melting supplement, is further promoted quick
Slugging.
At the end of LF stove refines, with being stained with, slag rod is viscous to take slag specimen, and chemical examination slag composition is by mass percentage：Al2O3：
27.85, CaO：58.79, MgO：2.53, MnO：0.089, P2O5：0.0006, S：0.20, SiO2：6.52, TFe：0.64, TiO：
0.24, basicity R：9.02.Slag composition is stablized, and absorption steel inclusion ability is stronger, and SiO in slag2Content is less, slag system alkali
Degree improves notable.TiO contents are relatively low in slag modifier for refining, [Ti] element in balance molten steel, absorb in molten steel [Ti] with certain
The ability of element.Without CaF2, not to environment, and be compressed to spherical or bulk in advance, thus produce dust also compared with
It is few.
The above, is only presently preferred embodiments of the present invention, is not the restriction for making other forms to the present invention, is appointed
What those skilled in the art changed possibly also with the technology contents of the disclosure above or be modified as equivalent variations etc.
Effect embodiment is applied to other fields, but every without departing from technical solution of the present invention content, according to the technical spirit of the present invention
Any simple modification, equivalent variations and the remodeling made to above example, still falls within the protection domain of technical solution of the present invention.
Claims (5)
1. a kind of environmental protection and energy saving pre-melted type slag modifier for refining, it is characterised in that：By weight percentage its chemical composition is：Al：
20%-28%, CaO：29%-37%, Al2O3：33%-41%, MgO≤2.5%, SiO2≤ 2.5%, FeO+MnO≤0.7%, S≤0.2%, P
≤ 0.2%, TiO≤0.30%, H2O≤0.7%。
2. environmental protection and energy saving pre-melted type slag modifier for refining according to claim 1, it is characterised in that：Its change by weight percentage
Study and be divided into：Al：23%-25%, CaO：32%-34%, Al2O3：36%-38%, MgO≤2%, SiO2≤ 2%, FeO+MnO≤0.5%, S
≤ 0.15%, P≤0.15%, TiO≤0.20%, H2O≤0.5%。
3. environmental protection and energy saving pre-melted type slag modifier for refining according to claim 2, it is characterised in that：The slag adjusting agent fusing point≤
1300℃。
4. environmental protection and energy saving pre-melted type slag modifier for refining according to claim 3, it is characterised in that：Below the slag adjusting agent Jing
Step is made, and by the simultaneously fritting of other raw material mix homogeneously in addition to aluminium powder, powder is then ground to, by aluminium powder and above-mentioned powder
Block or spherical finished product is pressed into after mix homogeneously.
5. environmental protection and energy saving pre-melted type slag modifier for refining according to claim 4, it is characterised in that：The slag adjusting agent finished product is
Granularity 15-25mm it is spherical.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611094859.9A CN106591538A (en) | 2016-12-02 | 2016-12-02 | Environmental-protecting and energy-saving premelting refining slag conditioning agent |
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| CN201611094859.9A CN106591538A (en) | 2016-12-02 | 2016-12-02 | Environmental-protecting and energy-saving premelting refining slag conditioning agent |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108103270A (en) * | 2017-12-22 | 2018-06-01 | 马鞍山中科冶金材料科技有限公司 | Calcium and magnesium base alumina-silica molten steel scavenger and preparation method thereof |
| 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 |
| CN108893576A (en) * | 2018-07-23 | 2018-11-27 | 攀钢集团攀枝花钢铁研究院有限公司 | The smelting process of welding rod steel H08A |
| CN108913836A (en) * | 2018-07-23 | 2018-11-30 | 攀钢集团攀枝花钢铁研究院有限公司 | The production method of welding rod steel H08A |
| CN114606363A (en) * | 2022-03-20 | 2022-06-10 | 新疆八一钢铁股份有限公司 | Refining synthetic slag for smelting low-carbon low-silicon steel on LF |
| CN114686643A (en) * | 2022-03-25 | 2022-07-01 | 武汉钢铁有限公司 | Composite slagging heat-compensating agent for smelting converter with large scrap steel ratio and preparation and use methods thereof |
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| CN1775961A (en) * | 2005-10-11 | 2006-05-24 | 梅一峰 | Prefused refined slag modified aluminium slag ball and its preparing method |
| CN105779695A (en) * | 2016-05-10 | 2016-07-20 | 商丘市商鼎耐火材料有限公司 | Environment-friendly smokeless molten steel refining slag modifier |
| CN106148633A (en) * | 2016-07-28 | 2016-11-23 | 攀钢集团攀枝花钢铁研究院有限公司 | The stable control method of aluminum content in a kind of IF steel |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1775961A (en) * | 2005-10-11 | 2006-05-24 | 梅一峰 | Prefused refined slag modified aluminium slag ball and its preparing method |
| CN105779695A (en) * | 2016-05-10 | 2016-07-20 | 商丘市商鼎耐火材料有限公司 | Environment-friendly smokeless molten steel refining slag modifier |
| CN106148633A (en) * | 2016-07-28 | 2016-11-23 | 攀钢集团攀枝花钢铁研究院有限公司 | The stable control method of aluminum content in a kind of IF steel |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108103270A (en) * | 2017-12-22 | 2018-06-01 | 马鞍山中科冶金材料科技有限公司 | Calcium and magnesium base alumina-silica molten steel scavenger and preparation method thereof |
| 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 |
| CN108893576A (en) * | 2018-07-23 | 2018-11-27 | 攀钢集团攀枝花钢铁研究院有限公司 | The smelting process of welding rod steel H08A |
| CN108913836A (en) * | 2018-07-23 | 2018-11-30 | 攀钢集团攀枝花钢铁研究院有限公司 | The production method of welding rod steel H08A |
| CN114606363A (en) * | 2022-03-20 | 2022-06-10 | 新疆八一钢铁股份有限公司 | Refining synthetic slag for smelting low-carbon low-silicon steel on LF |
| CN114686643A (en) * | 2022-03-25 | 2022-07-01 | 武汉钢铁有限公司 | Composite slagging heat-compensating agent for smelting converter with large scrap steel ratio and preparation and use methods thereof |
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