CN102492850B - Method for recycling iron alloy by smelting red mud - Google Patents
Method for recycling iron alloy by smelting red mud Download PDFInfo
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- CN102492850B CN102492850B CN2011104156848A CN201110415684A CN102492850B CN 102492850 B CN102492850 B CN 102492850B CN 2011104156848 A CN2011104156848 A CN 2011104156848A CN 201110415684 A CN201110415684 A CN 201110415684A CN 102492850 B CN102492850 B CN 102492850B
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- Y—GENERAL 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
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Abstract
The invention discloses a method for recycling iron alloy by continuously smelting red mud, which comprises the following processing steps of: firstly, mixing the red mud with reducing agent, slag forming constituent and binding agent sufficiently and then forming spherical burden; then continuously feeding the spherical burden into a burden barrel so as to form a burden column, and continuously feeding a power frequency induction furnace with the burden; next, heating the burden by the power frequency induction furnace so as to form melt, and forming reducing atmosphere in the induction furnace; next, reducing iron in the oxidation state in the burden to be metallic melt; enabling aluminum in the oxidation state to form molten slag with the slag forming constituent still in the oxidation state; next, electromagnetically stirring the melt in the furnace by the power frequency induction furnace, mixing the melt with the molten slag uniformly, and pouring the mixture from a pouring port to a front bed; next, separating the reduced metal iron melt from the molten slag in the front bed; at last, cooling the metal melt, and obtaining iron alloy ingots and slag rich in aluminum oxide. The method disclosed by the invention solves the problem in expansion as the red mud is treated by the smelting method, and simplifies the process.
Description
Technical field
The present invention relates to a kind of smelting process, especially a kind of method that from red mud, reclaims iron alloy by melting.
Background technology
Red mud also claims red soil, the contaminative waste residue of discharging when mud is Aluminium industry extraction aluminum oxide, 1 ton of aluminum oxide of the every production of average, 1.0～2.0 tons of red muds of subsidiary generation.China is as the world the 4th big alumina producing state, and the red mud of annual discharging is up to millions of tons.A large amount of red muds can not fully effectively utilize, and can only rely on large-area stockyard to stack, and has taken a large amount of soils, owing to contain a large amount of strong alkaline substances in the red mud, adopts the landfill disposal mode that environment has been caused serious pollution.About 7,000 ten thousand tons of the annual red mud that produces in the whole world, the annual red mud that produces of China is more than 3,000 ten thousand tons.The generation of a large amount of red muds causes many-sided direct and indirect influence to Human's production, life, so reduce output and the harm of red mud to greatest extent, realization by all kinds of means, the resource utilization of quantity is extremely urgent greatly.Generally contain multiple metal trace elements such as a large amount of iron and titanium in the red mud, but therefore still have bigger utility value and economic worth.In order from red mud, to reclaim above-mentioned metallic element, can reclaim by methods such as physical separation, metallurgy, chemistry.Physical separation at first needs red mud is carried out magnetic processing, and then adopts the magnetic preparator irony separating substances in the red mud to be come out complex process, poor practicability.Existing metallurgical method generally needs slag making, and then slag is pulled out slag by slag-drip opening handle, this method can't be applicable to the smelting of red mud, be because contained a large amount of slag charges and be Powdered in the red mud raw material, the raw material of red mud and slag can float on bath surface in the process of feeding intake, thereby cause swollen material to form bulge, therefore can't produce.The method that adopts chemistry is to add acid solution, and with the reactive metal oxide formation metallic solution in the red mud, this method processing method complexity owing to contain other a large amount of mineral in the red mud, therefore also can be wasted a large amount of reaction solutions.
Summary of the invention
The purpose of this invention is to provide a kind of red mud melting and reclaim the method for iron alloy, adopt the swollen material problem that melting method was caused to solve red mud, simplify technology.
The present invention is achieved through the following technical solutions above-mentioned purpose:
The method of iron alloy is reclaimed in red mud continuous smelting, comprises following processing step:
A. with red mud with make spherical furnace charge after reductive agent, slag former, tackiness agent fully mix;
B. spherical furnace charge is added in the barrel body continuously and forms stock column, and feed intake to line frequency induction furnace continuously;
C. line frequency induction furnace adds the thermosetting melt to furnace charge, and forms reducing atmosphere in induction furnace;
D. the oxidation state iron in the furnace charge is reduced into metal melt; Oxidation state aluminium still forms slag with its oxidation state form and slag former;
E. line frequency induction furnace produces function composite by electromagnetic stirring to melt in the stove, and melt is evenly mixed with slag, is continuously pouring to external crucible from a sprue gate;
F. the metallic iron melt that is reduced is realized separating in external crucible with slag;
G. obtain iron alloy ingot and alumina rich slag after the metal melt cooling.
Wherein, the ferro element in the applying that melting is reclaimed is by weight percentage greater than 80%, and aluminium element is by weight percentage less than 1%.
Wherein, described line frequency induction furnace is the malleation reduction furnace, and the opening for feed of stove is provided with the syllogic feeding unit, also is provided with in the stove for reclaiming CO (carbon monoxide converter) gas and collects mouth, and the sprue gate of stove arranges the liquid level that is lower than melt.
The invention has the beneficial effects as follows: adopt line frequency induction furnace that red mud is carried out melting, line frequency induction furnace can generate an electromagnetic field in melt in fusion process, thereby make melt self produce strong stirring, whole melting need slag making in stove, but the metal melt in the red mud and slag are mixed fully, can promote the reduction reaction of metal oxide to carry out fully on the one hand, can avoid slag to float on the swollen material problem that the melt top causes on the other hand, after fully finishing, reduction reaction again melt cast is incubated to external crucible, slag gentlier floats and the metal melt sinking, thereby realizes both separation.Reclaim obtain metal alloy be the lower irony alloy of aluminum content, can have very high economic worth directly as the direct raw material of smelting iron and steel.And this technology simply can realize continuous dosing production, and is highly efficient in productivity and cost recovery is very low, can effectively solve the problem of the recycling of existing red mud.
Embodiment
The method of iron alloy is reclaimed in red mud continuous smelting, comprises following processing step:
A. with red mud with make spherical furnace charge after reductive agent, slag former, tackiness agent fully mix;
B. spherical furnace charge is added in the barrel body continuously and forms stock column, and feed intake to line frequency induction furnace continuously;
C. line frequency induction furnace adds the thermosetting melt to furnace charge, and forms reducing atmosphere in induction furnace;
D. the oxidation state iron in the furnace charge is reduced into metal melt; Oxidation state aluminium still forms slag with its oxidation state form and slag former;
E. line frequency induction furnace produces function composite by electromagnetic stirring to melt in the stove, and melt is evenly mixed with slag, is continuously pouring to external crucible from a sprue gate;
F. the metallic iron melt that is reduced is realized separating in external crucible with slag;
G. obtain iron alloy ingot and alumina rich slag after the metal melt cooling.
Adopt line frequency induction furnace that red mud is carried out melting, line frequency induction furnace can generate an electromagnetic field in melt in fusion process, thereby make melt self produce strong stirring, whole melting need slag making in stove, but the metal melt in the red mud and slag are mixed fully, reduction reaction that on the one hand can promotes oxidn attitude iron can be carried out fully, can avoid slag to float on the swollen material problem that the melt top causes on the other hand, after fully finishing, reduction reaction again melt cast is incubated to external crucible, slag gentlier floats and the metal melt sinking, thereby realizes both separation.Reclaim obtain metal alloy be the lower irony alloy of aluminum content, can have very high economic worth directly as the direct raw material of smelting iron and steel.And this technology simply can realize continuous dosing production, and is highly efficient in productivity and cost recovery is very low, can effectively solve the problem of the recycling of existing red mud.
Adopt ferro element in the metal alloy that above-mentioned technology melting reclaims by weight percentage greater than 80%, aluminium element is by weight percentage less than 1%.This is owing to aluminium element in red mud mainly is to exist with the aluminum oxide form, in fusion process, can not be reduced, therefore aluminium element only can be enriched in the slag, and in alloy content seldom, just this melting technology can realize the separation of ferro-aluminum element, what obtain is a kind of iron alloy, except ferro element, also have some trace elements as elements such as titanium, lead, copper, nickel, silver, magnesium, silicon, this alloy is the raw material that is well suited for making steel, and has higher economic value.
For the reduction reaction of guaranteeing metal melt can fully be carried out, line frequency induction furnace adopts the malleation reduction furnace, and the opening for feed of stove is provided with the syllogic feeding unit, can prevent effectively that airborne oxygen from entering in the stove.Owing to added excessive reductive agent in the raw material, it generally is coke, therefore be full of a large amount of carbon monoxide in the stove, to guarantee the reducing atmosphere in the stove, excessive carbon monoxide needs to discharge, therefore also be provided with in the stove for reclaiming CO (carbon monoxide converter) gas and collect mouth, the carbon monoxide of collection can be used as combustion gas and uses.The sprue gate of stove arranges the liquid level that is lower than melt, thereby being flowed out by the sprue gate that fused mass after reaction can be continuous realizes continuous cast production, can prevent that also air admission is in stove.
Claims (1)
1. the method for iron alloy is reclaimed in red mud continuous smelting, comprises following processing step:
A. with red mud with make spherical furnace charge after reductive agent, slag former, tackiness agent fully mix;
B. spherical furnace charge is added in the barrel body continuously and forms stock column, and feed intake to line frequency induction furnace continuously;
C. line frequency induction furnace adds the thermosetting melt to furnace charge, and forms reducing atmosphere in induction furnace;
D. the oxidation state iron in the furnace charge is reduced into metal melt; Oxidation state aluminium still forms slag with its oxidation state form and slag former;
E. line frequency induction furnace produces function composite by electromagnetic stirring to melt in the stove, and melt is evenly mixed with slag, is continuously pouring to external crucible from a sprue gate;
F. the metallic iron melt that is reduced is realized separating in external crucible with slag;
G. obtain iron alloy ingot and alumina rich slag after the metal melt cooling;
It is characterized in that: the ferro element in the iron alloy that melting is reclaimed is by weight percentage greater than 80%, and aluminium element is by weight percentage less than 1%; And described line frequency induction furnace is the malleation reduction furnace, and the opening for feed of stove is provided with the syllogic feeding unit, also is provided with in the stove for reclaiming CO (carbon monoxide converter) gas and collects mouth, and the sprue gate of stove arranges the liquid level that is lower than melt.
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| CN2011104156848A CN102492850B (en) | 2011-12-14 | 2011-12-14 | Method for recycling iron alloy by smelting red mud |
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| CN2011104156848A CN102492850B (en) | 2011-12-14 | 2011-12-14 | Method for recycling iron alloy by smelting red mud |
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| CN102492850B true CN102492850B (en) | 2013-08-21 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1888102A (en) * | 2006-07-14 | 2007-01-03 | 中国铝业股份有限公司 | Direct Al-Si-Fe alloy smelting process in ore smelting furnace |
| CN101429582A (en) * | 2008-12-04 | 2009-05-13 | 武汉科技大学 | Method for producing ferro-silicon alloy and calcium aluminate material with red mud and aluminum ash |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53117601A (en) * | 1977-03-23 | 1978-10-14 | Sumitomo Metal Ind Ltd | Recovering method for valuable metals in stainless steel slag |
| SU1735408A1 (en) * | 1990-04-10 | 1992-05-23 | Норильский горно-металлургический комбинат им.А.П.Завенягина | Process for treating slags for production of heavy nonferrous metals |
| KR20050109763A (en) * | 2004-05-17 | 2005-11-22 | 주식회사 포스코 | Method for recovery valuable metals from steel-making slag of stainless steel |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1888102A (en) * | 2006-07-14 | 2007-01-03 | 中国铝业股份有限公司 | Direct Al-Si-Fe alloy smelting process in ore smelting furnace |
| CN101429582A (en) * | 2008-12-04 | 2009-05-13 | 武汉科技大学 | Method for producing ferro-silicon alloy and calcium aluminate material with red mud and aluminum ash |
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