CN104419830A - Method for controlling content of aluminum in iron alloy in large-capacity submerged arc furnace - Google Patents
Method for controlling content of aluminum in iron alloy in large-capacity submerged arc furnace Download PDFInfo
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- CN104419830A CN104419830A CN201310365065.1A CN201310365065A CN104419830A CN 104419830 A CN104419830 A CN 104419830A CN 201310365065 A CN201310365065 A CN 201310365065A CN 104419830 A CN104419830 A CN 104419830A
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Abstract
The invention provides a method for controlling the content of aluminum in iron alloy in a large-capacity submerged arc furnace. In the method, raw petroleum coke, of which 80% is larger than 10-15 mm in granularity, is employed as a reducing agent. The iron alloy prepared through the method is lower than 1.5%, even than 1.0%, in the content of aluminum.
Description
Technical field
The present invention relates to the preparation method of iron alloy, particularly relate to the method controlling the iron alloy aluminium content that it is smelted when large-capacity ore furnace is smelted.
Background technology
Iron alloy is typically used as reductor and/or the alloying agents of molten steel.Some steel grade, as electrical steel and Properties of Heavy Rail Steel By require the strict aluminium content controlled in steel, therefore just needs the strict aluminium content controlled in its alloy used.Such as, 1%(weight is just limited in for the aluminium content in the ferrosilicon of electrical steel and Properties of Heavy Rail Steel By and Si-Ca-Ba-Mg composite deoxidant) below.
Aluminium in described iron alloy from its ore used, reductive agent, especially contained in coke impurity and ash content.All containing the Al2O3 that ratio is very high in described impurity and ash content.Al in these Al2O3 is reduced out and melts in finished iron alloy in the process of mine heat furnace smelting, thus the aluminium content of product iron alloy is raised.As long as be easy to it is contemplated that select high-grade ore and low-ash reductive agent just can prepare the iron alloy of low aluminium.At occurring in nature, impure few ore reserves is limited, though carefully ore dressing, washing also described impurity all can not be removed, therefore select low-ash reductive agent may be the main path solved the problems of the technologies described above.
Chinese patent application 200510096335.9 discloses a kind ofly prepares the method that aluminium content is the low aluminium calsibar alloy of 0.5-1%.The Main Means that the method controls aluminium content is, by the Control for Kiln Temperature of mineral hot furnace below 1800 DEG C; In the forward direction stove that the alloy of institute's melting is come out of the stove, add fluorite, described fluorite reducible [Al], thus reduce the content of pure aluminum in alloy.The present inventor, based on the consideration on metallurgy principle, thinks that aforesaid method is infeasible, because, by the Control for Kiln Temperature of mineral hot furnace below 1800 DEG C, other alloying element, as silicon, calcium and barium just can not be reduced, so prevent the idea of the reduction of aluminium from being unpractiaca by reducing furnace temperature; In addition, fluorite, namely the Al in Al2O3 can not restore by CaF2, above-mentioned Al can not be oxidized to Al2O3 and be driven among slag, so, also unrealistic by adding the aluminium that fluorite removes in alloy in mineral hot furnace.Owing to running counter to known metallurgy principle, so can affirm, the method described in this patent application, for the aluminium content in alloy being limited to the scope of 0.5-1% without any technology enlightenment with true value.
Chinese patent application 200910008561.5 discloses the Si-Ca-Ba-Mg composite alloy that a kind of aluminium content is less than or equal to 1.5%, and this alloy is prepare in the mineral hot furnace of 6300KVA at capacity.Described alloy system charcoal and petroleum coke as reducing agent are prepared from.Although the ash content of charcoal is low, and reactive behavior is well the well-known fact, and in the face of the reality that the forest reserves are day by day deficient, reductive agent made by a large amount of use charcoal, is worthless apparently.
Chinese patent application 87104601 discloses the production method that one relates to " high purity ferrosilicon ".The method ties up in 4000KVA mineral hot furnace and implements, and reductive agent used is refinery coke, and its ash oontent is 0.10-1.44%; Granularity is 0-10 millimeter, wherein 0-5 millimeter account for the overwhelming majority; The aluminium content of the alloy of gained is respectively 0.4% and 0.1%.From the ash oontent of the refinery coke that it uses, above-mentioned alloy should be able to be obtained by the method.But those skilled in the art knows, refinery coke is the very easily graphited carbonaceous material of one.When it being made in mineral hot furnace reductive agent, it is very easily deposited on furnace bottom because of greying, causes furnace bottom rising, so blowing out process of having to.Although the ash oontent of refinery coke is very low, its obvious greying trend, makes it in mineral hot furnace, slowly can not get application.Chinese patent application 87104601 solves the very ingenious of the method for an above-mentioned refinery coke greying difficult problem.The method controls its reactive behavior by the granularity controlling refinery coke used.As everyone knows, less then its specific surface area of the granularity as the refinery coke of reductive agent is larger, and thus its reactive behavior is also higher.Method described in this patent application, taking full advantage of granularity is 0-10 millimeter, the wherein high reaction activity accounting for most refinery cokes of 0-5 millimeter, just can make it before abundant greying, the oxide compound such as SiO2 in whole or large portion and raw material reacts the conversion zone and the CO generating gaseous state overflows, that is, as long as create conditions, the speed that described refinery coke is consumed because participating in above-mentioned reduction reaction, is greater than itself graphited speed, just can avoids the graphited difficult problem of refinery coke.
Usually when using metallurgical Jiaozhuo mineral hot furnace reductive agent, its granularity is generally 5-18 millimeter, and forbidding coke powder.Doing such requirement, is to ensure that the bed of material of mineral hot furnace has good ventilation property.Requiring that the mineral hot furnace bed of material has good ventilation property is based on following 2 considerations: one, be that the CO that the reduction reaction in order to ensure in mineral hot furnace produces can discharge smoothly, described reduction reaction be carried out smoothly; Its two, be the splash preventing from causing because exhaust is smooth melt in stove.Method described in patent application 87104601, is only applicable to the low capacity of 4000KVA.The molten bath of this stove is shallow, bed thickness is little, even if ventilation property is poor also may can not cause serious problems, but for the mineral hot furnace that capacity is 12500KVA or more, granularity is selected to be 0-10 millimeter, with regard to being difficult to, the wherein petroleum coke as reducing agent accounting for the overwhelming majority of 0-5 millimeter, ensures that the bed of material of mineral hot furnace has good ventilation property.Those skilled in the art can not confirm, described in patent application 87104601, granularity is 0-10 millimeter, and wherein whether the refinery coke accounting for the overwhelming majority of 0-5 millimeter is also applicable to the mineral hot furnace of 12500KVA or more.
The object of the present invention is to provide a kind of large-capacity ore furnace of being applicable to, the new method preparing low-aluminum-content iron alloy, the method both make use of the advantage of refinery coke low ash content, turn avoid it and was easy to graphited deficiency, but also the bed of material can be made to have good ventilation property.
Summary of the invention
The invention provides a kind of method that large-capacity ore furnace controls aluminium content in iron alloy, it is characterized in that, employing ash oontent is that the raw petroleum coke of 0.1-1.0% makes reductive agent, and its size-grade distribution is that the raw petroleum coke of ﹥ 10-15 millimeter accounts for more than 80%; All the other are the raw petroleum coke of granularity ﹤ 10 millimeters.
Above-mentioned " Large Copacity " mineral hot furnace refers to that power is the mineral hot furnace of 12500KVA or more.According to the industry policy that China is existing, power is lower than the mineral hot furnace of 12500KVA, because of its high energy consumption, inefficient shortcoming, all be eliminated, therefore, the technician of operation mineral hot furnace must consider, disclosed in Chinese patent application 87104601, whether " production method of high purity ferrosilicon " that be only applicable to 4000KVA mineral hot furnace is also applicable to the mineral hot furnace of 12500KVA.Answer is negative, and reason is, the mineral hot furnace of 12500KVA or more and the mineral hot furnace of 4000KVA only just have a great difference on size of burner hearth.The furnace depth of the mineral hot furnace of 12500KVA is 2.6 meters, and the mineral hot furnace furnace depth of 4000KVA is only 1.7 meters, the two nearly 1 meter of difference.Furnace depth difference must cause the bed thickness in stove different, and then, also different to the requirement of the ventilation property of the described bed of material.Understandable, bed thickness is larger, then require that its ventilation property is also higher.In view of this, " 0-10 millimeter, the wherein coke grain accounting for the overwhelming majority of 0-5 millimeter " disclosed in Chinese patent application 87104601 is not obviously suitable for the mineral hot furnace that capacity is greater than 12500KVA.For improving the ventilation property of the bed of material, strengthen raw material, granularity particularly as the refinery coke of reductive agent is the technical measures that must take, therefore, under the prerequisite considering greying trend and the bed permeability taking into account refinery coke itself, the present inventor select coke grain be " raw petroleum coke of ﹥ 10-15 millimeter accounts for more than 80%; All the other are the raw petroleum coke of granularity ﹤ 10 millimeters ".
As previously mentioned, the granularity of refinery coke is larger, and its greying trend is also stronger, and yes makes furnace bottom rising for result.Prior art was instructed, and prevented the graphited measure of refinery coke from being improve its reactive behavior, made it before graphitization, because of with the oxide compound generation reduction reaction in material and depleted.The refinery coke being applicable to large-capacity ore furnace that the present inventor selects is raw petroleum coke.Described raw petroleum coke is a kind of directly acquisition from refinery coke processing space, without the refinery coke of process further.It has spongy structure that is loose, porous, is therefore referred to as sponge coke again.The vesicular structure that this kind of raw petroleum coke is unique, makes it to have larger specific surface area, thus also just has good reactive behavior.This good reactive behavior compensate for the reactive behavior deficiency because its granularity is caused by strengthening.In other words, with more than 80% granularity be the raw petroleum coke of ﹥ 10-15 millimeter and all the other be the reductive agent that raw petroleum cokes of granularity ﹤ 10 millimeters make large-capacity ore furnace, both the greying of refinery coke can have been prevented, in turn ensure that the reactive behavior of described refinery coke and the ventilation property of the bed of material, thus the aluminium content in described mineral hot furnace product can be controlled in 1.5%, even less than 1.0%.
The ash content of described raw petroleum coke is defined in the scope of 0.1-1.0%, be consider that different steel grade is different to the requirement of residual aluminium content, when producing the iron alloy being used for high-quality steel, adopt low-ash raw petroleum coke to make reductive agent, vice versa.
According to method of the present invention, the aluminium content in described iron alloy can be limited in below 1.5% or even 1.0%.In whole smelting process, the working of a furnace is normal, and operator frequently need not smash stove; Within the whole stove labour phase, without the furnace bottom rising problem caused because of the greying of refinery coke, thus also just without the need to blowing out process furnace bottom.
The present invention is on the basis of existing technology, is completed by the kind of creationary selection refinery coke and granularity thereof, so the routine techniques details relevant to mineral hot furnace operation, as material grade, batching, cloth, heating, automatically controlled, tapping a blast furnace etc. repeats no more.
Embodiment
The present invention is further illustrated below by embodiment.
Embodiment 1
With the conventional open style mine heat furnace smelting high purity ferrosilicon that power is 12500KVA.
Adopt the spongy raw petroleum coke of ash content 0.4% to make reductive agent, its granularity is: the raw petroleum coke granularity ﹥ 10-15 millimeter of 85%; The raw petroleum coke of remaining granularity ﹤ 10 millimeters;
The SiO of silica
2content ﹥ 97%.
Smelt according to a conventional method.
The ferrosilicon aluminum content of gained is 0.35%.
Embodiment 2
Disclosed in the conventional open style mine heat furnace smelting Chinese patent application 200910008561.5 being 12500KVA with power, Chinese patent application 200910008561.5 discloses the Si-Ca-Ba-Mg composite alloy that a kind of aluminium content is less than or equal to 1.5%,
Adopt the spongy raw petroleum coke of ash content 1.0% to make reductive agent, its granularity is: the raw petroleum coke granularity ﹥ 10-15 millimeter of 85%; The raw petroleum coke of remaining granularity ﹤ 10 millimeters;
Smelt by the ordinary method described in this patent application.
The aluminum content of the Si-Ca-Ba-Mg composite alloy of gained is 0.45%.
Claims (1)
1. large-capacity ore furnace controls a method for aluminium content in iron alloy, it is characterized in that, employing ash oontent is that the raw petroleum coke of 0.1-1.0% makes reductive agent, and its size-grade distribution is: the raw petroleum coke of ﹥ 10-15 millimeter accounts for more than 80%; All the other are the raw petroleum coke of granularity ﹤ 10 millimeters.
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| CN201310365065.1A CN104419830A (en) | 2013-08-20 | 2013-08-20 | Method for controlling content of aluminum in iron alloy in large-capacity submerged arc furnace |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4526612A (en) * | 1982-09-08 | 1985-07-02 | Skf Steel Engineering Ab | Method of manufacturing ferrosilicon |
| CN87104601A (en) * | 1987-06-30 | 1988-01-20 | 湖北省京山县硅材料开发应用研究所 | high purity ferrosilicon and production method |
| CN1190135A (en) * | 1997-12-17 | 1998-08-12 | 水利部丹江口水利枢纽管理局铁合金厂 | Production process of high-quality ferrosilicon |
| CN1321786A (en) * | 2001-04-11 | 2001-11-14 | 湖北省京山县山塔铁合金有限公司 | Production process of trace-level high-purity silicoferrite |
| CN101230434A (en) * | 2008-02-18 | 2008-07-30 | 张国辉 | Method for producing high-activity granular carbon reductant |
| CN101550470A (en) * | 2008-04-01 | 2009-10-07 | 王玉清 | Low-aluminum silicon-barium-calcium alloy and production process thereof |
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2013
- 2013-08-20 CN CN201310365065.1A patent/CN104419830A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4526612A (en) * | 1982-09-08 | 1985-07-02 | Skf Steel Engineering Ab | Method of manufacturing ferrosilicon |
| CN87104601A (en) * | 1987-06-30 | 1988-01-20 | 湖北省京山县硅材料开发应用研究所 | high purity ferrosilicon and production method |
| CN1190135A (en) * | 1997-12-17 | 1998-08-12 | 水利部丹江口水利枢纽管理局铁合金厂 | Production process of high-quality ferrosilicon |
| CN1321786A (en) * | 2001-04-11 | 2001-11-14 | 湖北省京山县山塔铁合金有限公司 | Production process of trace-level high-purity silicoferrite |
| CN101230434A (en) * | 2008-02-18 | 2008-07-30 | 张国辉 | Method for producing high-activity granular carbon reductant |
| CN101550470A (en) * | 2008-04-01 | 2009-10-07 | 王玉清 | Low-aluminum silicon-barium-calcium alloy and production process thereof |
Non-Patent Citations (1)
| Title |
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| 许传才: "《铁合金冶炼工艺学》", 30 June 2008, 冶金工业出版社 * |
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