CN101418365B - Magnesia-alumina-ferroalloy preparation method - Google Patents

Magnesia-alumina-ferroalloy preparation method Download PDF

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Publication number
CN101418365B
CN101418365B CN2008102265016A CN200810226501A CN101418365B CN 101418365 B CN101418365 B CN 101418365B CN 2008102265016 A CN2008102265016 A CN 2008102265016A CN 200810226501 A CN200810226501 A CN 200810226501A CN 101418365 B CN101418365 B CN 101418365B
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China
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magnesium
aluminum
induction furnace
iron
alloy
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CN2008102265016A
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Chinese (zh)
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CN101418365A (en
Inventor
张建良
祁成林
张雪松
孔德文
郭豪
刘文文
陈永星
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北京科技大学
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/20Recycling

Abstract

The invention relates to magnesium-aluminum-iron alloy and a preparation method thereof, which belongs to the field of steelmaking and is suitable for industrialized production of a desulfurating and deoxidizing agent of the magnesium-aluminum-iron alloy. The chemical compositions of the alloy in percentage by mass are: 3 to 15 percent of magnesium, 30 to 60 percent of aluminum and the balance being iron. An induction furnace is adopted for smelting, and the charging sequence is particularly important, wherein firstly, aluminum blocks which account for 25 to 35 percent of the total aluminum amount are added into the bottom of the induction furnace; secondly, all the magnesium ingots are placed into the induction furnace; thirdly, the residual aluminum blocks which account for 65 to 75 percent of the total aluminum amount are added into the induction furnace; and fourthly, all the metallic irons or waste steels are added into the induction furnace finally. The preparation method places the magnesium, the aluminum and the iron into the induction furnace for once, does not require smelting of intermediate alloy, shortens the process, directly produces the magnesium-aluminum-iron alloy, does not add any casting powder, realizes alloy smelting by reasonable charging and severe control of a temperature rise system, and is convenient to produce. The iron alloy is directly added into molten steel when used; and after the iron alloy is added, the content of oxygen and the content of sulfur in the molten steel are obviously reduced, and the prior chain deoxidizing products are converted into granulated deoxidizing products, so that the desulfurating and deoxidizing efficiency is higher and the cost is lower.

Description

A kind of preparation method of magnesia-alumina-ferroalloy
Technical field
The invention belongs to field of steel-making, relate to a kind of preparation method of magnesia-alumina-ferroalloy, be applicable to the suitability for industrialized production of magnesia-alumina-ferroalloy desulfating and deoxidation agent.
Background technology
Along with the China Steel industry fast development over year of near twenty or thirty, also more and more higher to requirements such as employed steel grade purity, uniformity coefficient, grain fineness, require simultaneously to reduce production costs, the over-all properties of steel also increases thereupon.Fine aluminium plays the tranquillizer effect in deoxidation process, aluminium and affinity for oxygen are very strong, and deoxidation efficient height is by people's widespread use.But, use fine aluminium or ferroaluminium deoxidation that some shortcomings are all arranged, from the physics aspect, the aluminium fusing point is low, and density is littler than molten steel density, easily floats in molten steel, and scaling loss is bigger, and than the composite alloy deoxidation, fine aluminium deoxidation utilization ratio is low; From chemical aspect, one, the deoxidation products aluminium sesquioxide in the steel is chain, the chain aluminium sesquioxide particle on the long-chain more is intensive more, and its plasticity-is very poor, thereby influences the mechanical property of steel; Two, the aluminium sesquioxide fusing point easily condenses into willow when pouring molten steel between 2020 ℃~2050 ℃, stops up the mouth of a river, is unfavorable for molten steel casting; Three, the reaction product of aluminium deoxidation and remain in aluminium in the steel often causes the creep brittleness of high temperature steel, reduces the hot strength of steel.Do the more and more difficult demand that meets deoxidation in steel making of reductor so use fine aluminium or ferro-aluminum.
Magnesium is a kind of generally acknowledged ideal desulfating and deoxidation agent, has only 1.74g/cm but the density of magnesium is very little 3In molten steel, easily float, adding is less than the deep of ladle, the boiling point of magnesium is low, solubleness is low, and vapour pressure height, boiling point are 648.80 ℃, solubleness when 1873K in molten steel only is 0.10%, vapour pressure is 2.24MPa, therefore, pure magnesium in molten steel because the short effect that is difficult to play deoxidization desulfuration of the residence time.Therefore magnalium unites that to use be to play a kind of complementary action, adds the density that iron can increase alloy on this basis, makes magnesia-alumina-ferroalloy fully contact in molten steel, improves the deoxidation efficient of magnalium as far as possible.Make deoxidization desulfuration more abundant.
Because magnesium solubleness in iron liquid is extremely low, magnesium and iron can not be made alloy, so magnesium is extremely difficult the adding in the iron liquid, even make magnesia-alumina-ferroalloy, the adding of magnesium also is unusual difficult.Magnesium is very active metal, and tap to tap time is long, and the loss of magnesium is big more, and cost is just high more.Not only recovery rate of iron is low and contain outer other elements of demagging, aluminium, iron in the smelting.
Summary of the invention
The present invention seeks to the magnesia-alumina-ferroalloy production technique that development and operation is easy, fast simple and the magnesium rate of recovery is high, satisfying under the commercial production conditions, produce magnesia-alumina-ferroalloy.
A kind of magnesia-alumina-ferroalloy, the chemical ingredients mass percent is:
Magnesium 3~15%, aluminium 30~60%, all the other are iron.
The preparation flow that the present invention produces magnesia-alumina-ferroalloy is:
What smelting was adopted is induction furnace, and the order of cloth is particularly important: add 25%~35% of whole alumiunum amount in the bottom of induction furnace earlier; Magnesium ingot is all put into induction furnace then; Add 65%~75% remaining aluminium block again, add whole metallic irons or steel scrap at last.By formulating reasonable temperature increasing schedule, originally press the speed of 30~50 ℃/min, near 700 ℃ the time, adjust temperature rise rate, rise to 900 ℃ with 10~30 ℃/min temperature rise rate, after reaching 900 ℃, skin temperature adjusts temperature rise rate once more, heat up with 1~10 ℃ temperature rise rate, until metallic iron or steel scrap, aluminium block and magnesium ingot off-bottom, the final steel liquid temp must not be greater than 1300 ℃.Through repetition test, can guarantee that under this state of temperature metallic iron or steel scrap, magnesium and aluminium melt fully mutually, alloying constituent is even, and does not have MAGNESIUM METAL steam and overflow.Furnace temperature should strict control in the process of smelting, because if the too high burning that may will cause magnesium, in case burn, emits a large amount of heat and uncontrollable.Should suitably improve temperature in the time will pouring into a mould, the alloy of avoiding hanging on the furnace wall in the time of can making cast is too much, and same intensification can not be too high, if the too high meeting of temperature produces safety problem to operator.From energy-conservation angle, to shorten the heat as much as possible, the time of smelting a stove alloy is generally about 30~55 minutes.The time of smelting end proves that for metallic iron or steel scrap in stove have abundant fusing time all join the interior metallic iron of stove or steel scrap melts.
The present invention is under non-vacuum condition; do not add any halogen compound such as U-Ramin MC; bifluoride calcium etc. are to the deleterious covering slag of surrounding environment; smelt the intensification temperature by reasonable burden distribution system and control then; make lower boiling; low solubility, the magnesium of high-vapor-pressure joins in the magnesia-alumina-ferroalloy with the simple substance dissolution mechanism, and can be so that the recovery rate of magnesium, aluminium, iron all reaches the suitability for industrialized production requirement.This kind alloy can be used as the whole desulfating and deoxidation agent of molten steel, and is easy to use, directly drops in the molten steel to get final product.Because proportion, the fusing point of alloy ratio simple substance magnesium and fine aluminium are big, the time that stops in molten steel during the alloy deoxidation is longer, and utilization ratio is higher, and cost is also low, and the recovery rate of magnesium can reach 85%~90%
Embodiment
Embodiment one:
Alloying constituent (below be all massfraction): magnesium: 3%; Aluminium: 35%; Iron: 62% cloth order: in stove, put into the aluminium about 1/4th earlier, then add whole magnesium, add remaining aluminium again, add whole metallic irons or steel scrap at last.
Smelting process: earlier with 30~50 ℃/min rapid heating, join about 700 ℃, reduce 10~30 ℃/min of temperature rise rate temperature rise rate and rise to 900 ℃, the watchcase temperature is measured probably than low 50 spending to about 100 degree in the stove with infrared thermometer, changes along with the variation of temperature rise rate.After skin temperature reaches 900 degree, reduce temperature rise rate once more, with the temperature rise rate of 1~10 ℃/min, this stage is the process that is in insulation basically, makes that the solid matter in the stove is all molten mutually.Pour into a mould after treating all to become liquid mutual melting.
Embodiment two:
Alloying constituent: magnesium: 5%; Aluminium: 35%; Iron: 60%
Cloth order and smelting process are with example one.
Embodiment three:
Alloying constituent: magnesium: 8%; Aluminium: 37%; Iron 55% cloth order and smelting process are with example one.
Embodiment four
Alloying constituent: magnesium: 12%; Aluminium: 38%; Iron: 50% cloth order and smelting process are with example one.

Claims (1)

1. the preparation method of a magnesia-alumina-ferroalloy is characterized in that the magnesia-alumina-ferroalloy mass percent is: magnesium 3%~15%, and aluminium 30%~60%, surplus is an iron; Burden distribution system adopts following steps: the induction furnace bottom adds 25%~35% aluminium block, and whole magnesium ingots are put into induction furnace, adds remaining 65%~75% aluminium block again, adds the metallic iron or the steel scrap that all will add at last; On the temperature increasing schedule, originally press the temperature rise rate of 30~50 ℃/min, in the time of 700 ℃, adjust temperature rise rate, rise to 900 ℃ with 10~20 ℃/min temperature rise rate, after reaching 900 ℃, skin temperature adjusts temperature rise rate once more, heat up with 1~10 ℃ temperature rise rate, all melt until metallic iron or steel scrap, aluminium block and magnesium ingot, the final steel liquid temp must not be greater than 1300 ℃.
CN2008102265016A 2008-11-13 2008-11-13 Magnesia-alumina-ferroalloy preparation method CN101418365B (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102978340A (en) * 2012-11-26 2013-03-20 张桂芬 Steelmaking deoxidizing agent and preparation method thereof
CN103937929A (en) * 2014-04-09 2014-07-23 莱芜钢铁集团有限公司 Desulfurizing agent and adding method thereof

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103540837A (en) * 2013-11-06 2014-01-29 攀钢集团研究院有限公司 Magnesium alloy for steelmaking and steelmaking deoxidization method
CN103741020A (en) * 2013-12-27 2014-04-23 姚芸 Preparation method of magnesium-aluminum-iron alloy for desulfurizing and deoxidizing agent
CN105441632A (en) * 2014-08-21 2016-03-30 武汉凌科达科技有限公司 Magnesium-aluminium composite oxygen scavenger
CN105441633A (en) * 2014-08-21 2016-03-30 武汉凌科达科技有限公司 Preparation method of magnesium-aluminium composite oxygen scavenger

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102978340A (en) * 2012-11-26 2013-03-20 张桂芬 Steelmaking deoxidizing agent and preparation method thereof
CN103937929A (en) * 2014-04-09 2014-07-23 莱芜钢铁集团有限公司 Desulfurizing agent and adding method thereof
CN103937929B (en) * 2014-04-09 2016-06-08 莱芜钢铁集团有限公司 Sweetening agent and Adding Way thereof

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