CN1030532C - Iron and steel smelting process by using aluminium slag - Google Patents
Iron and steel smelting process by using aluminium slag Download PDFInfo
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- CN1030532C CN1030532C CN 94100065 CN94100065A CN1030532C CN 1030532 C CN1030532 C CN 1030532C CN 94100065 CN94100065 CN 94100065 CN 94100065 A CN94100065 A CN 94100065A CN 1030532 C CN1030532 C CN 1030532C
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- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The present invention relates to a steel smelting process by using aluminium grit, which mainly utilizes the aluminium grit and aluminium powder for preparing the mixtures of the aluminium grit and the aluminium powder, the mixtures meet various smelting requirements and having various compositions, and the mixtures as deoxidizing agents and the auxiliary agents of desulfuring are sprayed into molten iron or molten steel for deoxidizing and desulfuring the molten steel or the molten iron, or heating the molten steel or the molten iron. In addition, the mixtures of the aluminium grit and the aluminium powder can be mixed with Fe2O3 and dry sawdust to preparing a heating and thermal insulating agent for the thermal insulation of the hot tops of steel ingots, and the yield of the steel ingots can be increased.
Description
The present invention relates to iron and steel smelting process, particularly the method for carrying out with the aluminium slag.
Normal about 3% the aluminium slag (hereinafter to be referred as AD) that generates in the melting of aluminium and refining process.Except that the oxide compound of Al, also contain metal A l among the AD.It is with its pulverizing that routine is utilized the method for AD, the granularity despecking, and the part separation that metallic aluminium content is high is carried out remelting and is reclaimed aluminium.Because it is very difficult to reclaim Al the AD of the low or metal A l content height from metal A l content but fine size, usually have to be them as the raw material of preparation sulfuric acid in order to further be used as the precipitating reagent of sewage purification.In this method, metal A l end contained among the AD is fully utilized.
The open JP56-58912(A of Japanese Patent) (1981,5.22 is open) discloses a kind of iron melt desulfurizing agent, and it is with CaC
2, lime and derive from various processes, as the aluminium ash of trade waste as main ingredient, metal in the described aluminium ash has played reductor and desulfurizing assistant agent.This patent disclosure end relates to the application of aluminium ash in steel-making and ingot casting journey.
The open JP63-170215(A(1988.7.14 of Japanese Patent) open) a kind of method of the AD of making granulation disclosed.Can be though in the document, mention with the AD after the method granulation of this patent disclosure as steel liquid deoxidizing agent, the exothermic material of temperature raising material and ingot casting, but unexposed AD is as the ins and outs of above-mentioned materials in steel-making and ingot casting process, thereby those skilled in the art still can not only form the steel ingot smelting process that a kind of AD of employing carries out with above-mentioned guidance.
Therefore, the object of the present invention is to provide a kind of desulfurizing iron method of carrying out with AD;
Another object of the present invention is to provide a kind of deoxidation of molten steel and temperature raising method of carrying out with AD;
A further object of the present invention is to provide a kind of molten steel desulfurizing that carries out with AD and the method for rapid slagging;
Another purpose of the present invention is to provide a kind of steel ingot hot top that makes that carries out with AD partly to be able to the method for heat preservation.
Above-mentioned purpose is achieved in that
AD and aluminium powder are mixed with mixture AD-30, and it consists of: Me-Al30-35%, Al
2O
345-55%, all the other are inevitable impurity; Spray into molten iron take nitrogen as carrier gas with the amount of 0.3-0.4Kg/ ton molten iron then, then spray into lime with the amount of about 0.5Kg/ ton molten iron again and make desulfurizing iron.
Wherein said lime contains the CaO more than 95%, and its granularity is below the 0.104mm.
With AD and aluminium powder preparating mixture AD-50, it consists of: Me-Al50-55%, Al
2O
325-35%, surplus is inevitable impurity; With N
2For spraying into described AD-50 to oxidation molten bath latter stage, that remove oxidizing slag with stoichiometrical consumption, carrier gas makes deoxidation of molten steel.
Consist of Me-Al30-35%, Al with AD and aluminium powder preparation
2O
345-55%, surplus is the mixture AD-30 of inevitable impurity, or consists of Me-Al40-45%, Al
2O
335-45%, surplus is the mixture AD-40 of inevitable impurity, after oxidation stops oxygen blast latter stage take air as carrier gas with the consumption of 1.6-2.0Kg/ ton molten steel with AD-40 or with the consumption of 2.0-2.5Kg/ ton molten steel with AD-30, in company with the consumption of 6.3-6.8Kg/ ton molten steel carbon dust is sprayed into the molten bath and heats up making it.
With AD and aluminium powder preparating mixture AD-15, it consists of Me-Al13-17%, Al
2O
370-75%, surplus is inevitable impurity; After when with the liquid steel temperature after the above-mentioned AD-50 deoxidation＞1650 ℃, getting rid of oxidizing slag, spray into the AD-15 mixture of 5.5Kg/ ton molten steel amount in the molten bath, meanwhile with Fe-Si and the Fe-Mn of conventional amount used, lime and fluorite are added in the steel ladle, energising make the molten bath heat up then big mouthful of tapping mixes with desulfurization slag.
Be mixed with AD and aluminium powder and consist of Me-Al13-17%, Al
2O
370-75%, surplus for the mixture AD-15 of inevitable impurity or consist of Me-Al20-25%, Al
2O
360-65%, surplus is the mixture AD-25 of inevitable impurity; Then with 90% AD-15,8% Fe
2O
3And 2% dried sawdust is mixed with on the molten steel face in heat preservation agent is sprinkled upon large-scale steel ingot with the thickness of 50-100mm the hot top; Or with 85% AD-25,12% Fe
2O
3, 3% dried sawdust is sprinkled upon on the molten steel face in the middle-size and small-size steel ingot hot top with the thickness of 50-100mm.Wherein said Fe
2O
3Such as being steel scale of steel rolling.
Although Al is conventional killer, Al
2O
3Slag former or the desulfurizing assistant agent of the steel smelting procedure of routine, but adopt AD to carry out smelting iron and steel its special advantage is arranged, it takes full advantage of as the metallic aluminium among the trade waste AD as deoxidier, and as desulfurizing assistant agent, it then has than the useless refractory brick blocks of routine or red bauxite and does not reduce basicity of slag and the fireballing advantage of slagging.
It is because the AD below the 1mm does not reclaim the value of metal A l that the granularity of AD is limited to below the 1mm.And such granularity is suitable for winding-up and adds, and because its bigger specific surface area can be participated in reaction rapidly and slagging.
Available very easy method is measured the metal A l content among the various AD, as making the AD and acid effect that will measure, determines the wherein content of metal A l by measuring the hydrogen that discharges in this reaction.
The typical blending process of above-mentioned AD-15-AD-50 is that raw material A D is ground, and selects granularity, measures metal A l content wherein, and the aluminium powder that adds requirement mixes then, AD-15 can be pressed in advance ,-25 ,-30 for ease of operation and management,-40 ,-50, composition requirement prepare the mixture of AD and aluminium powder.
Middle-size and small-size steel ingot recited above is meant the steel ingot that 6T is following, and large steel ingot is meant the steel ingot that 6T is above.Metal A l and the Fe among AD-15 or the AD-25 wherein
2O
3The reaction and generate heat described Fe
2O
3The mixture that contains ferriferous oxide, such as being the steel rolling iron scale.The effect of dried sawdust is to prevent that above-mentioned product from forming the fine and close good Al of heat conduction
2O
3Layer.
The steel smelting procedure that carries out with AD has following beneficial effect:
It has made full use of trade waste AD;
For the sweetening agent of base desulfurizing iron is compared as the lime of the desulfurizing assistant agent of molten iron and routine, added the AD mixture and made desulfurization degree improve 30%, desulfurization time shortens 50%, and the desulfurization expense has descended 62%.
As deoxidier, the AD-al powder mixt has replaced conventional aluminium ingot, and owing to having avoided the invalid burning of aluminium ingot on the top of the slag to reduce the consumption of the Al in the deoxygenation step, the while can be controlled the utilization rate of Al more accurately;
As temperature raising agent, the AD-al powder mixt can reach about 25-30 ℃/minute heat-up rate, generally is lower than 5 ℃/minute and depend merely on this speed of electric arc temperature raising.Thereby power consumption is obviously descended.
As the desulfurizing assistant agent of molten steel, the AD-al powder mixt is by making rapidly deoxygenation of liquid steel and impelling the rapid slagging of CaO, cancelled the conventional reduction period that generally reaches more than 20 minutes;
As the steel ingot heat preservation agent, use AD-Fe
2O
3-sawdust mixture can make the steel ingot recovery rate improve about 3% by its heat preservation effect.
Further specify the present invention below by embodiment.
Embodiment 1.
Spray into 80Kg in 220 tons of iron of initial [S]=0.04% take ammonia as carrier gas and consist of Me-Al35%, Al through preparation
2O
350%, surplus is the AD-30 mixture of inevitable impurity, and nitrogen buffer gas sprays into 1100Kg then, and CaO content is 95%, and granularity is the lime of 0.104mm, and [S] is down to 0.005% after 20 minutes.
With ammonia is that carrier gas is sprayed lime and CaC respectively to two batches of molten iron of same weight
2: CaCO
3=77: 23 mixture is respectively for 5500Kg and 750Kg make it desulfurization, and the result is a table 1.
(table 1 is seen the literary composition back)
With AD-30 and CaO mixed injection net effect is preferably arranged.
Embodiment 2.
Be mixed with AD and aluminium powder and consist of Me-Al55%, Al
2O
3Be 30% AD-50 mixture, described AD-50 sprayed into molten bath by oxygen content in the molten steel as the stoichiometric amount of base take nitrogen as carrier gas.The deoxidation utilization ratio of Me-Al among the AD-50 is 93%, and only is 76% with the deoxidation utilization ratio of inserting the aluminium ingot that the Al mode adds.
Embodiment 3.
Be mixed with AD and aluminium powder and consist of Me-Al43%, Al
2O
3Be 40%, surplus is the mixture AD-40 of inevitable impurity.Be that carrier gas sprays into AD-40 and coke powder in the molten bath of electric arc furnace of 40 tons of nominal capacities of 15000KVA with the consumption of 1.8Kg/ ton molten steel, 6.5Kg/ ton molten steel respectively behind molten finishing with the air.Similarly with described AD-40, coke powder is jetted respectively individually and any material of not jetting compares, and the intensification situation of bath sees Table 2:
Table 2 molten bath intensification situation
Spray into testing of materials stove and count average heating speed ℃/minute
AD-40 11 29.1
AD-40+ coke powder 11 28.7
Coke powder 9 13.1
Only electricity consumption 8＜5.0
The metallurgical effect of above-mentioned test sees Table 3
Table 3 metallurgical effect
Project is not sprayed AD-40 spray AD-40
Power consumption 100 95
Tap to tap time 100 93
Consumption of electrode 100 92
As seen jet AD-40 and except obvious molten bath temperature raising effect is arranged, also have preferably integrated smelting effect.
Embodiment 4.
Consist of Me-Al15%, Al with AD and aluminium powder preparation
2O
3Be 70%, surplus is the mixture AD-15 of inevitable impurity.At 15000KVA, in the electric arc furnace that nominal capacity is 40 tons, when liquid steel temperature is 1650 ℃, remove oxidation sludge, with carrier gas to the described AD-15 of molten bath winding-up 48Kg.Meanwhile in stove, add the lime of the described AD-15 of 48Kg, 150KgFe-Si, 300KgFe-Mn, 700Kg granularity 50mm, the fluorite of 100Kg granularity 50mm.Give electricity one minute, sampling, fast turndown tapping because additive and molten steel stir material in ladle, have promoted chemical reaction to make [S] in oxidation latter stage be down to 0.03% from 0.15% again.So original about 20-30 consuming time minute reduction period is cancelled basically.
Embodiment 5
Pour into a mould 40 tons of molten steel and become 12 steel ingots.Add on the molten steel face of hot top immediately after cast finishes and consist of AD-1590%, Fe
2O
38%, its thickness in hot top of the heat preserving agent of dried sawdust 2% is 60mm.The recovery rate average out to 85% of above-mentioned steel ingot, and with the recovery rate average out to 82% of the same steel ingot of conventional heat preserving agent insulation.Described AD-15 consists of Me-Al1%, Al
2O
370%, all the other are impurity.
Pour into a mould 40 tons of molten steel and become 12 steel ingots.Add on the molten steel face of hot top immediately after cast finishes and consist of AD-25 85%, Fe
2O
312%, dried sawdust is 3% heat preserving agent, and its thickness in hot top is 100mm.The recovery rate of upper several steel ingots on average is about 86%, and only is 81.3% with the average recovery rate of the same steel ingot of conventional heat preserving agent insulation.
Described AD-25 consists of Me-Al24%, Al
2O
363%, surplus is impurity.
Per-cent in this specification sheets and the following claim book all is weight percentage unless otherwise noted.
Table 1 sweetening effectiveness relatively
The independent AD-30+CaO CaC of CaO
2(77%)-CaCO
3(23%)
Desulfurization degree, % 100 130 140
Desulfurization time divides 40 20 19
Consumption Kg/T steel 25 5 3.4
Cost 263 100 224
Claims (9)
1, a kind of molten iron desulfurizing method that carries out with aluminium slag (being designated hereinafter simply as AD) the steps include: to be made into a kind of Me-Al30-35% of consisting of, Al with AD and aluminium powder
2O
245-55%, all the other are the mixture AD-30 of inevitable impurity; Nitrogen buffer gas then sprays into it in molten iron with the amount of 0.3-0.4Kg/ ton molten iron, then sprays into lime with the amount of about 0.5Kg/ ton molten iron again.
2, method as claimed in claim 1, wherein said lime contains the CaO more than 95%, and its granularity is below the 0.104mm.
3, a kind of molten steel deoxygenation method that carries out with AD the steps include: to be made into a kind of Me-Al50-55% of consisting of, Al with AD and aluminium powder
2O
325-35%, surplus be the AD-50 mixture of inevitable impurity, after the oxidation end of term removes oxidizing slag, make carrier gas sprays into described mixture AD-50 from stoichiometric amount to the molten bath with nitrogen.
4, a kind of AD molten steel temperature raising method of carrying out the steps include: to be made into a kind of Me-Al40-45% of consisting of, Al with AD and aluminium powder
2O
335-45%, surplus is the AD-40 mixture of inevitable impurity, take air as carrier gas, sprays into described molten bath with the consumption of the AD-40 of 1.6-2.0Kg/ ton molten steel in company with the powdered carbon of the consumption of 6.3-6.8Kg/ ton molten steel after oxidation stops oxygen blast latter stage.
5, a kind of molten steel temperature raising method of carrying out with AD the steps include: to be made into a kind of Me-Al30-35% of consisting of, Al with AD and aluminium powder
2O
345-55%, surplus is the AD-30 mixture of inevitable impurity, with the consumption of 2.0-2.5Kg/ ton molten steel AD-30 is sprayed into described molten bath in company with the powdered carbon of 6.3-6.8Kg/ ton molten steel consumption after stopping oxygen blast the heat of oxidation.
6, a kind of molten steel desulfurizing method of carrying out with AD the steps include: to be made into a kind of Me-Al13-17% of consisting of, Al with AD and aluminium powder
2O
370-75%, surplus is the AD-15 of inevitable impurity; After oxidation latter stage making the molten bath deoxidation with the method for claim 3 and liquid steel temperature when reaching 1650 ℃, consumption with 5.5Kg/ ton molten steel adds described AD-15 in stove, the Fe-Si and the Fe-Mn that meanwhile add convention amount in the steel ladle, molten steel is tapped fast after of short duration energising heating and is made the abundant hybrid reaction of AD-15 of molten steel, slag and adding in the stove.
7, a kind of steel ingot hot top heat preservation method of carrying out with AD the steps include: to be made into Me-Al13-17%, Al with AD and aluminium powder
2O
370-75%, surplus is the AD-15 mixture of not avoiding impurity, and then and Fe
2O
3, dried sawdust is made into and consists of AD-1590%, Fe
2O
38%, the heat preserving agent of dried sawdust 2% is removed in the hot top of the steel ingot more than 6 tons on the molten steel face with being about to described heat preservation agent after being poured, and its thickness is 50-100mm.
8, a kind of steel ingot hot top heat preservation method of carrying out with AD the steps include: to be made into Me-Al20-25%, Al with AD and aluminium powder
2O
360-65%, surplus is the AD-25 mixture of inevitable impurity, and then and Fe
2O
3, dried sawdust is made into and consists of AD-2585%, Fe
2O
312%, the heat preserving agent of dried sawdust 3% is removed on the molten steel face in the hot top of the steel ingot below 6 tons with being about to described heat preservation agent after being poured, and its thickness is 50-100mm.
9, each method in the claim 1,3,4,5,6,7 and 8, the granularity of wherein said AD is less than 1mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94100065 CN1030532C (en) | 1994-01-08 | 1994-01-08 | Iron and steel smelting process by using aluminium slag |
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|---|---|---|---|
| CN 94100065 CN1030532C (en) | 1994-01-08 | 1994-01-08 | Iron and steel smelting process by using aluminium slag |
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| CN1095762A CN1095762A (en) | 1994-11-30 |
| CN1030532C true CN1030532C (en) | 1995-12-20 |
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| CN100430320C (en) * | 2005-12-22 | 2008-11-05 | 宝山钢铁股份有限公司 | Artificial synthesizing process for calcium aluminate |
| DK2039785T3 (en) * | 2006-06-30 | 2011-08-15 | Techcom Gmbh | Method for steel pocket deoxidation |
| JP4445564B2 (en) * | 2008-09-05 | 2010-04-07 | 新日本製鐵株式会社 | Hot metal desulfurization method |
| CN101676410B (en) * | 2008-09-18 | 2011-06-29 | 宝山钢铁股份有限公司 | Aluminum slag, desulfurizer and desulfurizing method for desulfurization of high silicon molten iron |
| CN101486587B (en) * | 2009-01-04 | 2012-03-21 | 攀钢集团研究院有限公司 | Double-layer tundish covering agent |
| CN106167872A (en) * | 2016-06-29 | 2016-11-30 | 农杰 | The processing method of irony foundry goods |
| TWI769913B (en) | 2021-08-24 | 2022-07-01 | 財團法人工業技術研究院 | Ceramic composite and method of preparing the same |
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1994
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