CN102312049B - Desulfurizing agent suitable for high-aluminum silicon steel and preparation method thereof - Google Patents
Desulfurizing agent suitable for high-aluminum silicon steel and preparation method thereof Download PDFInfo
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- CN102312049B CN102312049B CN201010215663.7A CN201010215663A CN102312049B CN 102312049 B CN102312049 B CN 102312049B CN 201010215663 A CN201010215663 A CN 201010215663A CN 102312049 B CN102312049 B CN 102312049B
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- 229910000976 Electrical steel Inorganic materials 0.000 title claims abstract description 29
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- 239000003795 chemical substances by application Substances 0.000 title description 9
- 230000003009 desulfurizing effect Effects 0.000 title description 8
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims abstract description 16
- 239000011230 binding agent Substances 0.000 claims abstract description 16
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 15
- 239000002994 raw material Substances 0.000 claims abstract description 12
- 239000002245 particle Substances 0.000 claims abstract description 10
- 229910001629 magnesium chloride Inorganic materials 0.000 claims abstract description 8
- 238000002156 mixing Methods 0.000 claims abstract description 8
- 229920002545 silicone oil Polymers 0.000 claims abstract description 7
- 230000001681 protective effect Effects 0.000 claims abstract description 4
- 235000003599 food sweetener Nutrition 0.000 claims description 49
- 239000003765 sweetening agent Substances 0.000 claims description 49
- 239000000203 mixture Substances 0.000 claims description 20
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 14
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 13
- 229910052782 aluminium Inorganic materials 0.000 claims description 13
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 229910001868 water Inorganic materials 0.000 claims description 9
- 238000005453 pelletization Methods 0.000 claims description 5
- 238000012545 processing Methods 0.000 claims description 5
- 239000012528 membrane Substances 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 238000006477 desulfuration reaction Methods 0.000 abstract description 26
- 229910000831 Steel Inorganic materials 0.000 abstract description 24
- 239000010959 steel Substances 0.000 abstract description 24
- 230000023556 desulfurization Effects 0.000 abstract description 22
- 239000010936 titanium Substances 0.000 abstract description 22
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 abstract description 18
- 229910052719 titanium Inorganic materials 0.000 abstract description 17
- 238000000034 method Methods 0.000 abstract description 14
- 238000007670 refining Methods 0.000 abstract description 13
- 230000008569 process Effects 0.000 abstract description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract description 10
- 230000003628 erosive effect Effects 0.000 abstract description 7
- 239000000377 silicon dioxide Substances 0.000 abstract description 5
- 238000003912 environmental pollution Methods 0.000 abstract description 3
- 239000011819 refractory material Substances 0.000 abstract description 3
- 239000007921 spray Substances 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 4
- 229910052593 corundum Inorganic materials 0.000 abstract 4
- 229910001845 yogo sapphire Inorganic materials 0.000 abstract 4
- 229910052681 coesite Inorganic materials 0.000 abstract 1
- 229910052906 cristobalite Inorganic materials 0.000 abstract 1
- 238000001035 drying Methods 0.000 abstract 1
- 239000008187 granular material Substances 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 abstract 1
- 238000004806 packaging method and process Methods 0.000 abstract 1
- 239000008188 pellet Substances 0.000 abstract 1
- 238000003825 pressing Methods 0.000 abstract 1
- 229910052682 stishovite Inorganic materials 0.000 abstract 1
- 238000003860 storage Methods 0.000 abstract 1
- 229910052905 tridymite Inorganic materials 0.000 abstract 1
- 238000005303 weighing Methods 0.000 abstract 1
- 239000002893 slag Substances 0.000 description 17
- KMWBBMXGHHLDKL-UHFFFAOYSA-N [AlH3].[Si] Chemical compound [AlH3].[Si] KMWBBMXGHHLDKL-UHFFFAOYSA-N 0.000 description 10
- 238000009489 vacuum treatment Methods 0.000 description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 7
- 229910052799 carbon Inorganic materials 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 238000009434 installation Methods 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 5
- NACUKFIFISCLOQ-UHFFFAOYSA-N [Mg].[Cr] Chemical compound [Mg].[Cr] NACUKFIFISCLOQ-UHFFFAOYSA-N 0.000 description 5
- 239000012535 impurity Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 239000000843 powder Substances 0.000 description 5
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Chemical compound [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 5
- 238000002844 melting Methods 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 4
- 239000004411 aluminium Substances 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000012856 packing Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 229910004261 CaF 2 Inorganic materials 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 239000005864 Sulphur Substances 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 2
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000010436 fluorite Substances 0.000 description 2
- 238000007499 fusion processing Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 230000001603 reducing effect Effects 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 241000283984 Rodentia Species 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 229910010413 TiO 2 Inorganic materials 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 229960001866 silicon dioxide Drugs 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- 229960005196 titanium dioxide Drugs 0.000 description 1
- 230000003245 working effect Effects 0.000 description 1
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Abstract
The invention provides a desulfurizer suitable for high-aluminum silicon steel and a preparation method thereof, wherein the desulfurizer comprises the following components: CaO: 75 to 80 percent of Al2O3：10％～15％，MgO：3％～6％，MgCl2：3％～6％，SiO2Less than or equal to 1.5 percent, less than or equal to 0.02 percent of total Ti and less than or equal to 0.02 percent of total C. The preparation method comprises the following steps: weighing raw materials: CaO: 72% -77% of Al2O3: 8% -13%, binder: 10% -20%; ② mixing CaO and Al2O3Respectively crushing into granules with the diameter less than 0.1 mm; thirdly, heating CaO to 120-150 ℃, and carrying out spray treatment on CaO particles by using silicone oil to form a protective film; fourthly, mixing CaO and Al2O3Mixing with a binder; pressing into pellets by a ball press, drying and packaging. The desulfurizer of the invention has the advantages of easy storage, high desulfurization rate, little environmental pollution, little erosion to the refractory material of a vacuum groove body, molten steel recarburization and titanium increment controlled below 5ppm in the desulfurization process, and the desulfurization rate can reach more than 50% on the premise of not increasing the refining time.
Description
Technical field
The invention belongs to steel-making SECONDARY REFINING IN A VACUUM CHAMBER field, relate in particular to RH vacuum-treat sweetening agent and preparation method thereof for a kind of high-aluminum silicon steel.
Background technology
Silicon steel is a kind of electrotechnical steel, makes the iron core of transformer, motor of well behaved siliconized plate, can not only save the energy, reduces iron loss, and can also pollute by noise decrease.The core technology of its steelmaking process is the abundant removal of harmful element and the reasonable control of its inclusion.Sulphur is a kind of harmful elements for most steel grades, and at RH refining process, molten steel being carried out desulfurization is the common method of controlling sulphur content in steel.
60～seventies of last century, RH device obtained developing rapidly.Its major function is degassed, alloying, chemical heat, removal of inclusions, desulfurization etc.Wherein powder injection desulphurization such as has fast, stablizes at the advantage, but its equipment cost and running cost are higher, and dark sweetening effectiveness is not obvious.Relevant references has the powder injection desulphurization > > in year 27 4 phase of the volume 54-57 page < < molten steel RH refining processs of < < Shanghai Metals > >-2005.Because powder injection desulphurization has the problem that investment is large, environment is poor, running cost is high, therefore at present domestic normal employing is the mode desulfurization that in vacuum tank, top adds sweetening agent, and that the method has advantages of is easy and simple to handle, cost is low.Relevant references has year dark desulfurization of 40 11 phase of volume 27-29 page < < RH-KTB pre-melted slag of < < iron and steel > >-2005 to put into practice > >.
Patent (the application number: CN200910076729.6) disclose a kind of sweetening agent that chute adds that is applicable to of pre-melted slag deep desulfuration method > > in < < RH vacuum oven by name, this sweetening agent composition is: CaO:55～60%, Al
2o
3: 15～25%, SiO
2: 2～8%, MgO:0～5%, S:0～0.06, moisture: 0～0.5%, impurity: 0～1.89%; Be weight percentage.But this sweetening agent is not described the content of titanium and carbon, if by this sweetening agent for silicon steel desulfuration, very easily cause in steel that carbon and titanium content exceed standard.In addition SiO in this sweetening agent
2content also higher, SiO
2content be 2～8%, add the SiO that silicon steel forms in RH vacuum-treat process
2, aggravated the erosion to magnesium chromium firebrick on RH vacuum treatment installation, seriously restricted the work-ing life for the treatment of unit.The patent of < < vacuum refining agent by name and preparation method thereof > > (application number: CN200610020000.3) disclose high for inclusion content in melting steel content in the soft steel production processes such as non orientating silicon steel, oriented silicon steel, slag oxidisability strong, the feature of slag unstable properties, the composition (weight percent %) of having formulated RH vacuum refining agent is: CaO 32～45%, Al
2o
3: 25～36%, Al:15～25%, CaF
2: 0～8%, SiO
2: 0～8%, full C:0～0.18, all the other are impurity.In above-mentioned patent, the pre-fusant calcium aluminate of low-carbon (LC) add the effect of having played molten steel desulfurizing, metallic aluminium add the effect with deoxidation of molten steel.Though this patent shortcoming is that wherein fluorite can reduce refining agent fusing point, plays the effect of rapid slagging, simultaneously also strengthened slag to equipment work lining refractories erosion.The sweetening agent of this invention is not described titanium content equally, easily causes that in steel, titanium content exceeds standard.Patent (the application number: CN200510023269.2) composition of disclosed RH vacuum treatment deep desulfurization pre-melted slag is (weight percent %): CaO:48～56%, Al of < < used for ultra-low-carbon steel RH vacuum treatment deep desulfurization pre-melted slag by name and preparation method thereof > >
2o
3: 33～43%, MgO:0.2～5.0%, SiO
2: 2.5～6.0%, TiO
2≤ 1.9%, carbon≤0.05%, all the other are impurity.Above-mentioned pre-melted slag in the preparation, in order to reduce titanium in pre-melted slag and the content of carbon, the Wingdale that raw material is high-quality and high-purity Al
2o
3powder, but full titanium is not explained, because the titanium of all valence states and form may be all titanium by the aluminium reducing containing in aluminium silicon steel in sweetening agent, thereby causes that in steel, titanium content exceeds standard.In addition SiO in this sweetening agent
2content also higher, SiO
2content be 2.5～6.0%, add the SiO that silicon steel forms in RH vacuum-treat process
2, can aggravate equally the erosion to magnesium chromium firebrick on RH vacuum treatment installation.On the other hand, Al in this sweetening agent
2o
3content also higher, Al
2o
3content be 33～43%, containing aluminium silicon steel, when adopting aluminium deoxidation, can generate more Al
2o
3, make Al in slag
2o
3content raises, and is unfavorable for forming the calcium aluminate of low melting point, causes desulfurization performance to decline.
Above-mentioned sweetening agent is pre-melted desulfurizing agent, prepares sweetening agent and need apply corresponding fritting treatment facility, can cause the pollution of sweetening agent itself, also can reduce the activity of main desulfurization thing phase (CaO) when fritting is processed.
Patent (the application number: CN200610030597.X) disclosed non-pre-melted desulfurizing agent is applicable to RH Vacuum Desulfurization of a < < desulfurizing agent for non-oriented silicon steel > > by name, composition is (weight percent %): CaO:45～58%, Al
2o
3: 8～23%, CaF
2: 15～30; SiO
2: 3～8%; Mg:2～6%; C≤0.015%.This sweetening agent is not described the content of titanium, if by this sweetening agent for high-aluminum silicon steel desulfurization, very easily cause in steel that carbon and titanium content exceed standard.In addition SiO in this sweetening agent
2content also higher, SiO
2content be 3～8%, for the easily erosion of aggravation to magnesium chromium firebrick on RH vacuum treatment installation of silicon steel desulfuration.Though the fluorite in sweetening agent can reduce refining agent fusing point, play the effect of rapid slagging, simultaneously also strengthened slag to equipment work lining refractories erosion.
As mentioned above, existing sweetening agent can not meet the requirement containing aluminium silicon steel desulfuration, can cause carburetting, the increasing titanium phenomenon of molten steel in use procedure, does not also consider containing the Al generating in aluminium silicon steel refining process simultaneously
2o
3and SiO
2impact on the performance of slag.
Summary of the invention
The object of the invention is to overcome the deficiency that above-mentioned prior art exists, feature for high-aluminum silicon steel, provide that a kind of slagging speed is fast, desulfurization degree is high, it is little to pollute, molten steel recarburization and increasing titanium can be controlled at below 5ppm, and the resistance to material of vacuum trough body is corroded to little vacuum smelting desulfurizing agent and preparation method thereof.
The present invention is achieved in that this sweetening agent composition weight percent that is applicable to high-aluminum silicon steel is: CaO:75%～80%, Al
2o
3: 10%～15%, MgO:3%～6%, MgCl
2: 3%～6%, SiO
2≤ 1.5%, full Ti≤0.02%, full C≤0.02%, described full Ti refers to the whole Ti content in sweetening agent, described full C refers to the whole C content in sweetening agent.
The preparation method that the present invention is applicable to high-aluminum silicon steel sweetening agent comprises the following steps: 1. by following weight percent, to take raw material: CaO:72%～77%, Al
2o
3: 8%～13%, binding agent: 10%～20%, described binding agent is the mixture of magnesium oxide, magnesium chloride and water, its weight ratio is 1: 1: 1.5; 2. by CaO and Al
2o
3be broken into respectively the particle that particle diameter is less than 0.1mm; 3. for preventing that CaO, because water suction reduces activity, is heated to 120～150 ℃ by CaO, with silicone oil, to the processing of spraying of CaO particle, to form protective membrane, described silicone oil accounts for 3%～4% of CaO gross weight, and the thickness of described CaO surface protection film is 5～10 μ m; 4. by CaO, Al
2o
3mix with binding agent, mixing time is 2～4 hours; 5. use pressure>=500Kg/cm
2pair roller ball press be pressed into pelletizing, and dry at 130～160 ℃ of temperature so that organic composition volatilizees fast, discharge micro-moisture simultaneously, during packing, answer sealed damp-proof.
Basic thought of the present invention is to prepare raw material choose high-quality CaO and the Al of sweetening agent
2o
3, in described high-quality CaO, CaO content is greater than 98%, described high-quality Al
2o
3middle Al
2o
3content is greater than 98%, to avoid raw material to bring impurity element into, as titanium, carbon and silicon-dioxide etc.Sweetening agent is without fritting, not only cost-saving but also do not fall the activity of CaO.On the other hand, for easily generating the feature of aluminum oxide and silicon oxide when the aluminium silicon steel deoxidation alloying, suitably reduce aluminum oxide and silica content in sweetening agent, prevent in refining process because of aluminum oxide in slag and too high sweetening power decline and the erosion to refractory brick causing of silica content.
The object that the present invention adds CaO is, CaO is conducive to desulfurization, but simple CaO fusing point is higher, it and Al containing generating in aluminium silicon steel fusion process
2o
3and SiO
2and the Al that contains of sweetening agent itself
2o
3in conjunction with after, can generate the slag that fusing point is lower, be conducive to desulfurization.But too much CaO can make slag fluidity variation, even crust, is unfavorable for desulfurization.So the amount with addition of CaO is the feature of taking into account containing aluminium silicon steel, the content range of CaO is between 72%～77%.Add Al
2o
3object be: appropriate Al
2o
3can improve the flowing property of slag, consider containing in aluminium silicon steel fusion process and can generate Al
2o
3feature, so the content of aluminum oxide is controlled between 8%～13%.Binding agent is the mixture of magnesium oxide, magnesium chloride and water, and the weight ratio of magnesium oxide, magnesium chloride and water is 1: 1: 1.5, and binding agent add-on accounts for 10～20% of total material total amount.After this binding agent contacts with high-temperature molten steel, can generate magnesium oxide, magnesium oxide has provide protection to magnesium chromium firebrick on RH vacuum treatment installation.Raw material mixing time should be more than 2 hours, fully mix guaranteeing, mixing time is long, consumes human and material resources.
The sweetening agent of the present invention not only content of titanium, carbon is extremely low, and has rodent dioxide-containing silica also extremely low to magnesium chromium firebrick on RH vacuum treatment installation, and transportation compares with desulfurizer powder when using, and environmental pollution is little.Also consider containing the Al generating in aluminium silicon steel refining process simultaneously
2o
3and SiO
2impact on the performance of slag, during preparation sweetening agent, guarantees to contain higher CaO content and lower Al in sweetening agent
2o
3content.
Sweetening agent of the present invention has the preservation of being easy to, desulfurization degree is high, environmental pollution is little, the resistance to material of vacuum trough body is corroded to little feature, simultaneously when melting contains aluminium silicon steel, can guarantee that in whole sweetening process, molten steel recarburization is controlled at below 5ppm, the increasing titanium of molten steel is also controlled at below 5ppm, do not increasing under the prerequisite of refining time, desulfurization degree can reach more than 50%.
Embodiment
The present invention is further described by the following embodiment.
The embodiment of the present invention is carried out selection, preparation and melting as follows:
(1) raw material choose high-quality CaO (being more than 98% containing CaO) and high-quality Al
2o
3(containing Al
2o
3be more than 98%).
(2) by following weight percent, take raw material: CaO:72%～77%, Al
2o
3: 8%～13%, binding agent: 10%～20%, binding agent is the mixture of magnesium oxide, magnesium chloride and water, the weight percent of magnesium oxide, magnesium chloride and water is 1: 1: 1.5.By CaO and Al
2o
3put into respectively crusher and carry out grinding and processing, be broken into the particle that particle diameter is less than 0.1mm.
(3) for preventing that CaO from reducing activity because of water suction, adopt silicone oil to processings of spray of CaO particle, to form protective membrane, before spraying processing, CaO is heated to 120 ℃～150 ℃, sprinkling silicone oil accounts for 3%～4% of total CaO weight.
(4) by CaO and Al
2o
3mix with binding agent, mixing time is 2～4 hours.
(5) adopt pressure>=500Kg/cm
2pair roller ball press be pressed into pelletizing product.
(6) to the pelletizing oven dry suppressing, packing, stand-by.Bake out temperature, between 130～160 ℃, volatilizees organic composition fast, discharges micro-moisture simultaneously.During packing, note sealing, during preservation, guard against damp.
Embodiment of the present invention sweetening agent material rate is in Table 1.
The proportioning raw materials (wt%) of table 1 embodiment of the present invention sweetening agent
| Sweetening agent raw material | CaO | Al 2O 3 | Binding agent |
| Embodiment 1 | 75 | 13 | 12 |
| Embodiment 2 | 73 | 11 | 16 |
| Embodiment 3 | 72 | 10 | 18 |
Embodiment of the present invention sweetening agent chemical composition is in Table 2.
The chemical composition (wt%) of table 2 embodiment of the present invention sweetening agent
| Sweetening agent component | CaO | Al 2O 3 | MgO | MgCl 2 | SiO 2 | Full Ti | Full C | Other impurity |
| Embodiment 1 | 79 | 13 | 3 | 3 | 1.0 | 0.01 | 0.02 | 0.97 |
| Embodiment 2 | 78 | 12 | 4 | 4 | 0.9 | 0.02 | 0.02 | 1.06 |
| Embodiment 3 | 77 | 11 | 5 | 5 | 1.1 | 0.02 | 0.01 | 0.87 |
RH refining process by inventive embodiments sweetening agent for high-aluminum silicon steel, before and after molten steel desulfurizing, composition is in Table 3.As seen from Table 3, after desulfurization is processed, molten steel recarburization is controlled at below 5ppm, and molten steel increases titanium and is controlled at below 5ppm, and desulfurization degree can reach more than 50%.After testing identity desulfurization is processed, sweetening agent to the refractory loss on RH vacuum treatment installation seldom.
Composition contrast (wt%) before and after table 3 molten steel desulfurizing
Claims (6)
1. be applicable to a sweetening agent for high-aluminum silicon steel, it is characterized in that this sweetening agent composition weight percent is: CaO:77%～80%, Al
2o
3: 11%～15%, MgO:3%～5%, MgCl
2: 3%～6%, SiO
2≤ 1.5%, full Ti≤0.02%, full C≤0.02%, described full Ti refers to the whole Ti content in sweetening agent, described full C refers to the whole C content in sweetening agent.
2. described in claim 1, be applicable to a preparation method for high-aluminum silicon steel sweetening agent, it is characterized in that comprising the following steps: 1. by following weight percent, taking raw material: CaO:72%～77%, Al
2o
3: 8%～13%, binding agent: 10%～20%, described binding agent is the mixture of magnesium oxide, magnesium chloride and water; 2. by CaO and Al
2o
3be broken into respectively the particle that particle diameter is less than 0.1mm; 3. CaO is heated to 120～150 ℃, with silicone oil to the processing of spraying of CaO particle, to form protective membrane; 4. by CaO, Al
2o
3mix with binding agent; 5. with ball press, be pressed into pelletizing, and dry, pack.
3. the preparation method of sweetening agent according to claim 2, the weight ratio that it is characterized in that magnesium oxide, magnesium chloride and water in described binding agent is 1:1:1.5.
4. the preparation method of sweetening agent according to claim 2, is characterized in that in described CaO, CaO content is greater than 98%; Described Al
2o
3middle Al
2o
3content is greater than 98%.
5. the preparation method of sweetening agent according to claim 2, is characterized in that described silicone oil accounts for 3%～4% of CaO gross weight, and the thickness of described CaO surface protection film is 5～10 μ m.
6. the preparation method of sweetening agent according to claim 2, the mixing time that it is characterized in that described raw material is 2～4 hours; The bake out temperature of described pelletizing is 130～160 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010215663.7A CN102312049B (en) | 2010-06-29 | 2010-06-29 | Desulfurizing agent suitable for high-aluminum silicon steel and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010215663.7A CN102312049B (en) | 2010-06-29 | 2010-06-29 | Desulfurizing agent suitable for high-aluminum silicon steel and preparation method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN102312049A CN102312049A (en) | 2012-01-11 |
| CN102312049B true CN102312049B (en) | 2014-04-02 |
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| CN104178598B (en) * | 2014-08-26 | 2016-01-06 | 武汉钢铁(集团)公司 | A kind of iron melt desulfurizing agent and preparation method thereof |
| CN106521093A (en) * | 2016-12-08 | 2017-03-22 | 桂林加宏汽车修理有限公司 | Industrial desulfurizing agent |
| CN107837670A (en) * | 2017-12-12 | 2018-03-27 | 太原钢铁(集团)有限公司 | A kind of double alkali desulfurizing agents and preparation method thereof |
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