CN106702153A - Method and system for preparing metallized pellets - Google Patents
Method and system for preparing metallized pellets Download PDFInfo
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- CN106702153A CN106702153A CN201611111795.9A CN201611111795A CN106702153A CN 106702153 A CN106702153 A CN 106702153A CN 201611111795 A CN201611111795 A CN 201611111795A CN 106702153 A CN106702153 A CN 106702153A
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- pelletizing
- coal dust
- kernel
- composite carbon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/242—Binding; Briquetting ; Granulating with binders
- C22B1/244—Binding; Briquetting ; Granulating with binders organic
- C22B1/245—Binding; Briquetting ; Granulating with binders organic with carbonaceous material for the production of coked agglomerates
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
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- Geochemistry & Mineralogy (AREA)
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- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a method and a system for preparing metallized pellets. The method comprises the following steps that limestone powder, first coal powder and a first binding agent are mixed for primary pelletizing to obtain inner core pellets; the inner core pellets are mixed with iron ore powder, the limestone powder, second coal powder and a second binding agent for secondary pelletizing to obtain composite carbon-contained pellets with the inner core pellets as cores; the volatile content of the first coal powder is higher than the volatile content of the second coal powder; and the composite carbon-contained pellets are directly reduced in a rotary hearth furnace to obtain the metallized pellets. The metallized pellets prepared by the method have a lot of gaps inside, so that the metallizing rate of the metallized pellets can be prominently increased, and the energy consumption is prominently reduced; and the metallizing rate of the metallized pellets obtained by direct reduction reaches above 90%.
Description
Technical field
The present invention relates to chemical technology field, specifically, the present invention relates to a kind of method for preparing metallized pellet and
System.
Background technology
High-quality crude fuel resource is increasingly deficient in recent years, and in the case where crude fuel price rises steadily, need to develop new
Type furnace charge adapts to this situation, and the prereduced metal furnace charge that is produced as technological means in coal-based direct reduction method is to reduce
One effective measures of this dependence, degree of metalization reaches more than 80~90% persons referred to as metallic pellet, degree of metalization
Reach 30~80% and be referred to as semi metallized pellet ore deposit.Current rotary hearth furnace smelt it is used it is general require degree of metalization more than 90%,
Therefore pelletizing used by rotary hearth furnace is metallized pellet.
In field of metallurgy, different technological requirements use different carbonaceous pelletizings, common carbonaceous pelletizing used in metallurgy
Its phosphorus content is relatively low, is usually no more than 30wt%, is such as used to producing the carbonaceous pelletizing of sponge iron, and its phosphorus content is generally 10~
20wt%, its effect is that carbon is used in whole roasting as reducing agent.
It is relatively low that the existing method (pelletizing process) for preparing metallized pellet makes carbonaceous pelletizing porosity, reproducibility compared with
Difference, the recovery time is more long in rotary hearth furnace, and reduction temperature is higher, it is necessary to consume a large amount of energy consumptions, easily causes the waste of energy resource.
Thus, the method for preparing metallized pellet still has much room for improvement.
The content of the invention
It is contemplated that at least solving one of technical problem in correlation technique to a certain extent.Therefore, of the invention
One purpose is to propose a kind of method and system for preparing metallized pellet, the metallized pellet prepared using the method
Inside has a large amount of spaces, it is possible thereby to significantly improve the degree of metalization of metallized pellet, and significantly reduces energy consumption, through directly going back
The degree of metalization of the metallized pellet that original place reason is obtained reaches more than 90%.
In one aspect of the invention, the present invention proposes a kind of method for preparing metallized pellet.It is of the invention
Embodiment, the method includes：Agstone, the first coal dust and the first binding agent are mixed and the treatment of the first pelletizing, so as to
Obtain kernel pelletizing；The kernel pelletizing is mixed and with Iron Ore Powder, agstone, the second coal dust and the second binding agent
The treatment of two pelletizings, to obtain the composite carbon containing pellet with the kernel pelletizing as core, the volatile matter of first coal dust contains
Volatile matter content of the amount higher than second coal dust；And the composite carbon containing pellet is carried out at direct-reduction in rotary hearth furnace
Reason, to obtain metallized pellet.
Thus, the method for preparing metallized pellet according to embodiments of the present invention is by by agstone, the first binding agent
With the first coal dust of high volatile carry out mixing and the first pelletizing treatment, obtain kernel pelletizing, further, within caryosphere group be
Core carries out the second pelletizing treatment, and the second relatively low coal dust of Iron Ore Powder, volatile matter and agstone are wrapped in into kernel pelletizing
Outer surface, and then obtain composite carbon containing pellet.The composite carbon containing pellet prepared by the above method is processed in direct-reduction
In, the coal dust of high volatile first in kernel pelletizing can produce a large amount of carbon monoxide, carbon dioxide, hydrogen, first at high temperature
The escaping gases such as alkane, the gas can form a large amount of in whole composite carbon containing pellet during diffusing out kernel pelletizing
Space so that the porosity of composite carbon containing pellet increases, at the same time, there is gasification reaction and produce one in the coal dust of high volatile first
Carbonoxide, strengthens the reducing atmosphere inside pelletizing, so as to improve the reduction effect of composite carbon containing pellet, and then improves metal
The degree of metalization of pellet.
In addition, the method for preparing metallized pellet according to the above embodiment of the present invention can also have following additional skill
Art feature：
In some embodiments of the invention, the particle diameter of the agstone is 75 μm.Thus, it is possible to significantly improve described
Agstone decomposes the efficiency for producing carbon dioxide.
In some embodiments of the invention, first coal dust is at least one of lignite and jet coal.Thus, may be used
The efficiency for producing gas is decomposed to significantly improve first coal dust.
In some embodiments of the invention, the volatile matter of first coal dust is not less than 20wt%.Thus, it is possible to enter one
Step improves first coal dust and decomposes the efficiency for producing gas.
In some embodiments of the invention, the particle diameter of first coal dust is 1mm.Thus, it is possible to further improve institute
State the first coal dust and decompose the efficiency for producing gas.
In some embodiments of the invention, the agstone, first coal dust and first binding agent are pressed
According to mass ratio 100：(20~25)：(3~5) carry out mixing and the treatment of the first pelletizing.Thus, it is possible to show in direct-reduction treatment
The porosity of the increase kernel pelletizing is write, and then improves the efficiency of direct-reduction treatment.
In some embodiments of the invention, the average grain diameter of the kernel pelletizing is 3~5mm.Thus, it is possible to further
Improve the efficiency of direct-reduction treatment.
In some embodiments of the invention, the particle diameter of the Iron Ore Powder is 75 μm.Thus, it is possible to further improve direct
The efficiency of reduction treatment.
In some embodiments of the invention, second coal dust is at least one of semi-coke and coke.Thus, it is possible to
Effectively the valuable metal in the composite carbon containing pellet is reduced.
In some embodiments of the invention, the volatile matter of second coal dust is not higher than 15wt%.Thus, it is possible to enter one
Step is effectively reduced to the valuable metal in the composite carbon containing pellet.
In some embodiments of the invention, the particle diameter of second coal dust is 1mm.Thus, it is possible to effectively further
Valuable metal in the composite carbon containing pellet is reduced.
In some embodiments of the invention, the carbon-to-oxygen ratio in the composite carbon containing pellet is 1.05~1.20.Thus, may be used
Effectively further to be reduced to the valuable metal in the composite carbon containing pellet.
In some embodiments of the invention, the average grain diameter of the composite carbon containing pellet is 9~15mm.Thus, it is possible to
Further improve the efficiency of reduction reaction.
In some embodiments of the invention, direct-reduction treatment be carry out 20 under 1100~1250 degrees Celsius~
What 30min was completed.Thus, it is possible to further improve the efficiency of reduction reaction.
In the second aspect of the present invention, what the present invention proposed a kind of above-mentioned method for preparing metallized pellet of implementation is
System.Embodiments in accordance with the present invention, the system includes：Palletizing device, first palletizing device has agstone entrance,
The outlet of one coal powder entrance, the first binding agent entrance and kernel pelletizing；Second palletizing device, second palletizing device has kernel
The outlet of pelletizing entrance, Iron Ore Powder entrance, the second coal powder entrance, the second binding agent entrance and composite carbon containing pellet, the interior caryosphere
Group's entrance is connected with kernel pelletizing outlet；Rotary hearth furnace, the rotary hearth furnace has composite carbon containing pellet entrance and metallization ball
Group's outlet, the composite carbon containing pellet entrance is connected with composite carbon containing pellet outlet.
Thus, the system for preparing metallized pellet according to embodiments of the present invention is by by agstone, the first binding agent
With the first coal dust of high volatile carry out mixing and the first pelletizing treatment, obtain kernel pelletizing, further, within caryosphere group be
Core carries out the second pelletizing treatment, and the second relatively low coal dust of Iron Ore Powder, volatile matter and agstone are wrapped in into kernel pelletizing
Outer surface, and then obtain composite carbon containing pellet.The composite carbon containing pellet prepared by the above method is processed in direct-reduction
In, the coal dust of high volatile first in kernel pelletizing can produce a large amount of carbon monoxide, carbon dioxide, hydrogen, first at high temperature
The escaping gases such as alkane, the gas can form a large amount of in whole composite carbon containing pellet during diffusing out kernel pelletizing
Space so that the porosity of composite carbon containing pellet increases, at the same time, there is gasification reaction and produce one in the coal dust of high volatile first
Carbonoxide, strengthens the reducing atmosphere inside pelletizing, so as to improve the reduction effect of composite carbon containing pellet, and then improves metal
The degree of metalization of pellet.
Additional aspect of the invention and advantage will be set forth in part in the description, and will partly become from the following description
Obtain substantially, or recognized by practice of the invention.
Brief description of the drawings
Of the invention above-mentioned and/or additional aspect and advantage will become from description of the accompanying drawings below to embodiment is combined
Substantially and be readily appreciated that, wherein：
Fig. 1 is the method flow schematic diagram for preparing metallized pellet according to an embodiment of the invention；
Fig. 2 is the system structure diagram for preparing metallized pellet according to an embodiment of the invention.
Specific embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from start to finish
Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached
It is exemplary to scheme the embodiment of description, it is intended to for explaining the present invention, and be not considered as limiting the invention.
In the description of the invention, it is to be understood that term " first ", " second " are only used for describing purpose, and can not
It is interpreted as indicating or implying relative importance or the implicit quantity for indicating indicated technical characteristic.Thus, define " the
One ", at least one this feature can be expressed or be implicitly included to the feature of " second ".In the description of the invention, " multiple "
It is meant that at least two, such as two, three etc., unless otherwise expressly limited specifically.
In the present invention, unless otherwise clearly defined and limited, term " connected " should be interpreted broadly, for example, can be with
It is to be fixedly connected, or be detachably connected, or integrally；Can mechanically connect, or electrically connect；Can be straight
Connect connected, it is also possible to be indirectly connected to by intermediary, can be two element internals connection or two phase interactions of element
With relation, unless otherwise clearly restriction.For the ordinary skill in the art, on can understanding as the case may be
State term concrete meaning in the present invention.
In one aspect of the invention, the present invention proposes a kind of method for preparing metallized pellet.It is of the invention
Embodiment, the method includes：Agstone, the first coal dust and the first binding agent are mixed and the treatment of the first pelletizing, so as to
Obtain kernel pelletizing；Kernel pelletizing is mixed with Iron Ore Powder, agstone, the second coal dust and the second binding agent and second is made
Ball treatment, so that caryosphere group is the composite carbon containing pellet of core within obtaining, the volatile matter content of the first coal dust is higher than the second coal
The volatile matter content of powder；And composite carbon containing pellet is carried out into direct-reduction treatment in rotary hearth furnace, to obtain the ball that metallizes
Group.
Below with reference to Fig. 1, the method for preparing metallized pellet according to embodiments of the present invention is described in detail, the party
Method includes：
S100：The treatment of first pelletizing
In the step, agstone, the first coal dust and the first binding agent are mixed and the treatment of the first pelletizing, so as to
To kernel pelletizing.Inventor's discovery, the first pelletizing treatment is carried out by using agstone and the first coal dust, can be significantly increased
The porosity of the metallized pellet obtained in follow-up direct-reduction treatment, under the high temperature conditions, agstone can decompose generation
Carbon dioxide, volatile matter (the volatility gas such as carbon monoxide, carbon dioxide, hydrogen, methane for producing is decomposed with the first coal dust
Body) while pelletizing is diffused out, so as to be internally formed a large amount of spaces in pelletizing, increase the porosity of composite carbon containing pellet, improve also
Former efficiency.
Embodiments in accordance with the present invention, the species of the first binding agent is not particularly restricted, and those skilled in the art can be with
Selected according to actual needs, according to a particular embodiment of the invention, the first binding agent can be molten for liquid-containing binder starch
Liquid, thus, it is possible to make the kernel pelletizing molding effect for preparing preferable.
Embodiments in accordance with the present invention, the particle diameter of agstone is not particularly restricted, and those skilled in the art can be with root
Selected according to being actually needed, according to a particular embodiment of the invention, the particle diameter of agstone can be 75 μm.Inventor passes through
Experiment finds, before the first pelletizing treatment is carried out, is in advance subsequently being reduced directly levigate can the significantly improving of agstone
In treatment agstone decompose produce carbon dioxide efficiency, inventor find, by agstone it is levigate to particle diameter be 75 μ
M effects preferably, if agstone particle diameter is excessive, can decompose agstone and produce the less efficient of carbon dioxide,
Hole cannot be effectively produced in pelletizing, and if agstone is levigate to smaller particle diameter, then can increase early stage levigate
The energy consumption and cost for the treatment of.
Embodiments in accordance with the present invention, the species of the first coal dust is not particularly restricted, as long as can subsequently be reduced directly
Enough volatile matters (escaping gas such as carbon monoxide, carbon dioxide, hydrogen, methane) are produced in treatment so as to the shape in pelletizing
Into sufficient amount of hole, those skilled in the art can be selected according to actual needs, of the invention specific
Embodiment, the first coal dust can select at least one of lignite and jet coal.Inventor is found through experiments that, lignite and long flame
The need for the volatile matter of coal can meet and prepare kernel pelletizing, a large amount of volatilizations of generation can be decomposed in follow-up direct-reduction treatment
Point, a large amount of holes are produced in pelletizing, and then significantly improve the efficiency of direct-reduction treatment.
According to a particular embodiment of the invention, the volatile matter of the first coal dust is not less than 20wt%.Inventor's discovery, if the
The volatile matter of one coal dust is too low, then cannot produce enough volatile matters in follow-up direct-reduction treatment, and causing cannot in pelletizing
Enough holes are formed, and then influences the effect of direct-reduction treatment.
Embodiments in accordance with the present invention, the particle diameter of the first coal dust is not particularly restricted, and those skilled in the art can be with root
Selected according to being actually needed, according to a particular embodiment of the invention, the particle diameter of the first coal dust can be 1mm.Inventor passes through
Experiment finds, before the first pelletizing treatment is carried out, is in advance subsequently being reduced directly levigate can the significantly improving of the first coal dust
In treatment the first coal dust decompose produce volatile matter efficiency, inventor find, by the first coal dust it is levigate to particle diameter be 1mm effects compared with
It is good, if the first coal particle size is excessive, the first coal dust can be made to produce the less efficient of volatile matter, it is impossible to effectively in pelletizing
Hole is produced, and if the first coal dust is levigate to smaller particle diameter, then can increase the energy consumption and cost of the levigate treatment of early stage.
Embodiments in accordance with the present invention, the mixed proportion of agstone, the first coal dust and the first binding agent is not by special
Limitation, those skilled in the art can be selected according to actual needs, according to a particular embodiment of the invention, agstone,
First coal dust and the first binding agent can be according to mass ratioes 100：(20~25)：(3~5) are mixed, and are made to carry out first
Ball treatment.Inventor has found, if allocating into than too low for agstone and the first coal dust, cannot produce enough inside pelletizing
Hole, cause the efficiency reduction that direct-reduction is processed, and if allocating into than too high for agstone and the first coal dust, then can increase
Big cost；If the amount of allocating of the first binding agent is too low, it is molded effectively kernel pelletizing, and if the first binding agent
Amount of allocating it is too high, then can influence the carrying out of follow-up direct-reduction treatment.In consideration of it, inventor has carried out many experiments, and from
In aforementioned proportion is determined, can be according to mass ratio 100 by agstone, the first coal dust and the first binding agent：(20~25)：(3
~5) carry out the best results that mixing can process follow-up direct-reduction.
According to a particular embodiment of the invention, processing the particle diameter of kernel pelletizing for preparing by the first pelletizing can be
3~5mm.Inventor has found, the particle diameter of kernel pelletizing is excessive or too small can directly affect the treatment of follow-up second pelletizing and prepares
Composite carbon containing pellet particle diameter, and then influence the efficiency of follow-up direct-reduction treatment.
S200：The treatment of second pelletizing
In the step, the kernel pelletizing that will be prepared in S100 glues with Iron Ore Powder, agstone, the second coal dust and second
Knot agent carries out mixing and the treatment of the second pelletizing, so that caryosphere group is the composite carbon containing pellet of core within obtaining.Specifically, kernel
Agstone and the first coal dust in pelletizing can produce carbon dioxide gas under the hot conditions in follow-up direct-reduction treatment
Body and volatile matter (escaping gas such as carbon monoxide, carbon dioxide, hydrogen, methane), the gas can be with when pelletizing is diffused out
A large amount of spaces are formed in pelletizing, the porosity of pelletizing is significantly increased, while so that the volatilization of the first coal dust in kernel pelletizing
The CO gas produced with the gasification reaction in the first coal dust are divided to be more easy to be spread to outside pelletizing, so as to enhance pelletizing
Internal reducing atmosphere.Further, since the first coal dust of high volatile has been used in kernel pelletizing, in the treatment of the second pelletizing
The consumption of quality the second coal dust higher can be suitably reduced, thus, the phosphorus content in the metallized pellet for ensureing to prepare
While higher, preparation cost is reduced.
According to a particular embodiment of the invention, volatile matter content of the volatile matter content of the first coal dust higher than the second coal dust.
Thus, it is possible to while pelletizing is internally formed compared with concrete dynamic modulus in ensureing follow-up direct-reduction treatment, make iron in iron ore also
Former efficiency is higher.
According to a particular embodiment of the invention, spy is not received for preparing the species of the second binding agent of composite carbon containing pellet
Do not limit, can be from the first binder phase with can also be different with the first binding agent.
Embodiments in accordance with the present invention, the particle diameter of the Iron Ore Powder in composite carbon containing pellet is not particularly restricted, this area
Technical staff can be selected according to actual needs, and according to a particular embodiment of the invention, the particle diameter of Iron Ore Powder can be 75 μ
m.Inventor is had found by many experiments, before the second pelletizing treatment is carried out, can be significantly improved Iron Ore Powder is levigate in advance
Follow-up direct-reduction treatment in Iron Ore Powder in iron reduction efficiency, inventor find, by Iron Ore Powder it is levigate to particle diameter be 75 μ
M effects preferably, if Iron Ore Powder particle diameter is excessive, can make Iron Ore Powder smaller with the contact area of reducing agent, and then reduce iron ore
The reduction efficiency of iron in powder, and if Iron Ore Powder is levigate to smaller particle diameter, then can increase the levigate treatment of early stage energy consumption and
Cost.
Embodiments in accordance with the present invention, the species of the second coal dust is not particularly restricted, and those skilled in the art can be with root
Selected according to being actually needed, according to a particular embodiment of the invention, the second coal dust can be selected in semi-coke and coke at least
One of.Inventor's discovery, can be effective using at least one of quality semi-coke higher and coke in the treatment of the second pelletizing
Improve the reduction efficiency to iron in Iron Ore Powder.
According to a particular embodiment of the invention, the volatile matter of the second coal dust is not higher than 15wt%.Inventor has found, if adopted
With the coal of volatile matter too high (inferior quality), then effectively the iron in Iron Ore Powder cannot be reduced.
Embodiments in accordance with the present invention, the particle diameter of the second coal dust is not particularly restricted, and those skilled in the art can be with root
Selected according to being actually needed, according to a particular embodiment of the invention, the particle diameter of the second coal dust can be 1mm.Inventor passes through
Experiment finds, before the second pelletizing treatment is carried out, levigate can the significantly improving of the second coal dust is processed in sequential reduction in advance
In the second coal dust and Iron Ore Powder contact area, and then improve reduction efficiency of second coal dust to iron in Iron Ore Powder.Invention human hair
It is existing, by the second coal dust it is levigate to particle diameter be 1mm effects preferably, if the second coal particle size is excessive, the second coal dust and iron can be made
The contact area of miberal powder is too small, and then the second coal dust of influence is to the reduction efficiency of iron in Iron Ore Powder；And if the second coal dust ground
Carefully to smaller particle diameter, then can increase the energy consumption and cost of the levigate treatment of early stage.
According to a particular embodiment of the invention, can be in the treatment of the second pelletizing by kernel pelletizing and the second coal in adjustment
Allocating into than carbon-to-oxygen ratio in the composite carbon containing pellet that controls to prepare for powder is 1.05~1.20.Inventor is anticipated by many experiments
Other places discovery, if carbon-to-oxygen ratio is too low in composite carbon containing pellet, can cause the Iron Ore Powder in composite carbon containing pellet to be filled
Divide reduction, and if making carbon-to-oxygen ratio in composite carbon containing pellet too high, then need the amount of allocating of the second coal dust of raising high-quality, and then
Increase cost.
According to a particular embodiment of the invention, the particle diameter for processing the composite carbon containing pellet for preparing by the second pelletizing can
Think 9~15mm.Inventor has found, if the particle diameter of composite carbon containing pellet is excessive, can make composite carbon containing pellet follow-up straight
The heating surface area connect in reduction treatment is smaller, so as to reduce the efficiency of direct-reduction treatment.
S300：Direct-reduction is processed
In the step, S200 is prepared into composite carbon containing pellet supplying to rotary hearth furnace carries out direct-reduction treatment, so as to
Obtain metallized pellet.Specifically, in direct-reduction treatment, the agstone in kernel pelletizing can produce carbon dioxide gas
Body, the first coal dust can produce a large amount of volatile matters (escaping gas such as carbon monoxide, carbon dioxide, the hydrogen, methane) gas
A large amount of spaces can be being formed during diffusing out kernel pelletizing in whole composite carbon containing pellet so that composite carbon containing pellet
Porosity increase, at the same time, the coal dust of high volatile first occur gasification reaction produce carbon monoxide, make inside pelletizing also
Primordial Qi atmosphere strengthens, so as to improve the degree of metalization of metallized pellet.
Embodiments in accordance with the present invention, direct-reduction treatment is that 20~30min is carried out under 1100~1250 degrees Celsius is complete
Into.Direct-reduction treatment is carried out after Iron Ore Powder is prepared into composite carbon containing pellet by the above method, and then can be improved also
Former effect.Therefore, its direct-reduction treatment completes compound containing by only need to carrying out 20~30min under 1100~1250 degrees Celsius
The reduction treatment of carbon pellets, and the degree of metalization of the metallized pellet for obtaining can reach more than 90%.
Thus, the method for preparing metallized pellet according to embodiments of the present invention is by by agstone, the first binding agent
With the first coal dust of high volatile carry out mixing and the first pelletizing treatment, obtain kernel pelletizing, further, within caryosphere group be
Core carries out the second pelletizing treatment, and the second relatively low coal dust of Iron Ore Powder, volatile matter and agstone are wrapped in into kernel pelletizing
Outer surface, and then obtain composite carbon containing pellet.The composite carbon containing pellet prepared by the above method is processed in direct-reduction
In, the coal dust of high volatile first in kernel pelletizing can produce a large amount of carbon monoxide, carbon dioxide, hydrogen, first at high temperature
The escaping gases such as alkane, the gas can form a large amount of in whole composite carbon containing pellet during diffusing out kernel pelletizing
Space so that the porosity of composite carbon containing pellet increases, at the same time, there is gasification reaction and produce one in the coal dust of high volatile first
Carbonoxide, strengthens the reducing atmosphere inside pelletizing, so as to improve the reduction effect of composite carbon containing pellet, and then improves metal
The degree of metalization of pellet.
In the second aspect of the present invention, what the present invention proposed a kind of above-mentioned method for preparing metallized pellet of implementation is
System, embodiments in accordance with the present invention, with reference to Fig. 2, the system includes：First palletizing device 100, the second palletizing device 200 and turn
Bottom stove 300, wherein, there is the first pelletizing processing unit 100 agstone entrance 101, the first coal powder entrance 102, first to bond
Agent entrance 103 and kernel pelletizing outlet 104；Second palletizing device 200 have kernel pelletizing entrance 201, Iron Ore Powder entrance 202,
Second coal powder entrance 203, the second binding agent entrance 204 and composite carbon containing pellet outlet 205, kernel pelletizing entrance 201 and kernel
Pelletizing outlet 104 is connected；Rotary hearth furnace 300 has composite carbon containing pellet entrance 301 and metallized pellet outlet 302, composite carbon containing
Pelletizing entrance 301 is connected with composite carbon containing pellet outlet 205.
Below with reference to Fig. 2, the system for preparing metallized pellet according to embodiments of the present invention is described in detail：
Embodiments in accordance with the present invention, the first palletizing device 100 has agstone entrance 101, the first coal powder entrance
102nd, the first binding agent entrance 103 and kernel pelletizing outlet 104.It is possible thereby to agstone, the first coal dust and first are bonded
Agent carries out mixing and the treatment of the first pelletizing in the first palletizing device 100, to obtain kernel pelletizing.
Inventor's discovery, carries out the first pelletizing treatment, after can significantly increasing by using agstone and the first coal dust
The porosity of the metallized pellet obtained in continuous direct-reduction treatment, under the high temperature conditions, agstone can decompose generation two
Carbon oxide gas, volatile matter (the volatility gas such as carbon monoxide, carbon dioxide, hydrogen, methane for producing is decomposed with the first coal dust
Body) while pelletizing is diffused out, so as to be internally formed hole in pelletizing, increase the porosity of metallized pellet, improve to metallization
The reduction efficiency of pelletizing.
Embodiments in accordance with the present invention, the species of the first binding agent is not particularly restricted, and those skilled in the art can be with
Selected according to actual needs, according to a particular embodiment of the invention, the first binding agent can be molten for liquid-containing binder starch
Liquid, thus, it is possible to make the kernel pelletizing molding effect for preparing preferable.
Embodiments in accordance with the present invention, the particle diameter of agstone is not particularly restricted, and those skilled in the art can be with root
Selected according to being actually needed, according to a particular embodiment of the invention, the particle diameter of agstone can be 75 μm.Inventor passes through
Experiment finds, before the first pelletizing treatment is carried out, is in advance subsequently being reduced directly levigate can the significantly improving of agstone
In treatment agstone decompose produce carbon dioxide efficiency, inventor find, by agstone it is levigate to particle diameter be 75 μ
M effects preferably, if agstone particle diameter is excessive, can decompose agstone and produce the less efficient of carbon dioxide,
Hole cannot be effectively produced in pelletizing, and if agstone is levigate to smaller particle diameter, then can increase early stage levigate
The energy consumption and cost for the treatment of.
Embodiments in accordance with the present invention, the species of the first coal dust is not particularly restricted, as long as can subsequently be reduced directly
Enough volatile matters (escaping gas such as carbon monoxide, carbon dioxide, hydrogen, methane) are produced in treatment so as to the shape in pelletizing
Into sufficient amount of hole, those skilled in the art can be selected according to actual needs, of the invention specific
Embodiment, the first coal dust can select at least one of lignite and jet coal.Inventor is found through experiments that, lignite and long flame
The need for the volatile matter of coal can meet and prepare kernel pelletizing, a large amount of volatilizations of generation can be decomposed in follow-up direct-reduction treatment
Point, a large amount of holes are produced in pelletizing, and then significantly improve the efficiency of direct-reduction treatment.
According to a particular embodiment of the invention, the volatile matter of the first coal dust is not less than 20wt%.Inventor's discovery, if the
The volatile matter of one coal dust is too low, then cannot produce enough volatile matters in follow-up direct-reduction treatment, and causing cannot in pelletizing
Enough holes are formed, and then influences the effect of direct-reduction treatment.
Embodiments in accordance with the present invention, the particle diameter of the first coal dust is not particularly restricted, and those skilled in the art can be with root
Selected according to being actually needed, according to a particular embodiment of the invention, the particle diameter of the first coal dust can be 1mm.Inventor passes through
Experiment finds, before the first pelletizing treatment is carried out, is in advance subsequently being reduced directly levigate can the significantly improving of the first coal dust
In treatment the first coal dust decompose produce volatile matter efficiency, inventor find, by the first coal dust it is levigate to particle diameter be 1mm effects compared with
It is good, if the first coal particle size is excessive, the first coal dust can be made to produce the less efficient of volatile matter, it is impossible to effectively in pelletizing
Hole is produced, and if the first coal dust is levigate to smaller particle diameter, then can increase the energy consumption and cost of the levigate treatment of early stage.
Embodiments in accordance with the present invention, the mixed proportion of agstone, the first coal dust and the first binding agent is not by special
Limitation, those skilled in the art can be selected according to actual needs, according to a particular embodiment of the invention, agstone,
First coal dust and the first binding agent can be according to mass ratioes 100：(20~25)：(3~5) are mixed, and are made to carry out first
Ball treatment.Inventor has found, if allocating into than too low for agstone and the first coal dust, cannot produce enough inside pelletizing
Hole, cause the efficiency reduction that direct-reduction is processed, and if allocating into than too high for agstone and the first coal dust, then can increase
Big cost；If the amount of allocating of the first binding agent is too low, it is molded effectively kernel pelletizing, and if the first binding agent
Amount of allocating it is too high, then can influence the carrying out of follow-up direct-reduction treatment.In consideration of it, inventor has carried out many experiments, and from
In aforementioned proportion is determined, can be according to mass ratio 100 by agstone, the first coal dust and the first binding agent：(20~25)：(3
~5) carry out the best results that mixing can process follow-up direct-reduction.
According to a particular embodiment of the invention, processing the particle diameter of kernel pelletizing for preparing by the first pelletizing can be
3~5mm.Inventor has found, the particle diameter of kernel pelletizing is excessive or too small can directly affect the treatment of follow-up second pelletizing and prepares
Composite carbon containing pellet particle diameter, and then influence the efficiency of follow-up direct-reduction treatment.
Embodiments in accordance with the present invention, the second palletizing device 200 have kernel pelletizing entrance 201, Iron Ore Powder entrance 202,
Second coal powder entrance 203, the second binding agent entrance 204 and composite carbon containing pellet outlet 205, kernel pelletizing entrance 201 and kernel
Pelletizing outlet 104 is connected.It is possible thereby to by kernel pelletizing and Iron Ore Powder, agstone, the second coal dust and the second binding agent the
Two palletizing devices 200 carry out mixing and the treatment of the second pelletizing, so that caryosphere group is the composite carbon containing pellet of core within obtaining.
Specifically, the agstone and the first coal dust in kernel pelletizing can be in the high temperature bars in follow-up direct-reduction treatment
Carbon dioxide and volatile matter (escaping gas such as carbon monoxide, carbon dioxide, hydrogen, methane), the gas are produced under part
A large amount of spaces can be formed in pelletizing when pelletizing is diffused out, the porosity of pelletizing is significantly increased, while so that kernel pelletizing
In the first coal dust volatile matter and the first coal dust in gasification reaction produce CO gas be more easy to outside pelletizing
Diffusion, so as to enhance the reducing atmosphere inside pelletizing.Further, since having used the first coal of high volatile in kernel pelletizing
Powder, can suitably reduce the consumption of quality the second coal dust higher in the treatment of the second pelletizing, thus, ensure what is prepared
While phosphorus content is higher in metallized pellet, preparation cost is reduced.
According to a particular embodiment of the invention, volatile matter content of the volatile matter content of the first coal dust higher than the second coal dust.
Thus, it is possible to while pelletizing is internally formed compared with concrete dynamic modulus in ensureing follow-up direct-reduction treatment, make iron in iron ore also
Former efficiency is higher.
According to a particular embodiment of the invention, spy is not received for preparing the species of the second binding agent of composite carbon containing pellet
Do not limit, can be from the first binder phase with can also be different with the first binding agent.
Embodiments in accordance with the present invention, the particle diameter of the Iron Ore Powder in composite carbon containing pellet is not particularly restricted, this area
Technical staff can be selected according to actual needs, and according to a particular embodiment of the invention, the particle diameter of Iron Ore Powder can be 75 μ
m.Inventor is had found by many experiments, before the second pelletizing treatment is carried out, can be significantly improved Iron Ore Powder is levigate in advance
Follow-up direct-reduction treatment in Iron Ore Powder in iron reduction efficiency, inventor find, by Iron Ore Powder it is levigate to particle diameter be 75 μ
M effects preferably, if Iron Ore Powder particle diameter is excessive, can make Iron Ore Powder smaller with the contact area of reducing agent, and then reduce iron ore
The reduction efficiency of iron in powder, and if Iron Ore Powder is levigate to smaller particle diameter, then can increase the levigate treatment of early stage energy consumption and
Cost.
Embodiments in accordance with the present invention, the species of the second coal dust is not particularly restricted, and those skilled in the art can be with root
Selected according to being actually needed, according to a particular embodiment of the invention, the second coal dust can be selected in semi-coke and coke at least
One of.Inventor's discovery, can be effective using at least one of quality semi-coke higher and coke in the treatment of the second pelletizing
Improve the reduction efficiency to iron in Iron Ore Powder.
According to a particular embodiment of the invention, the volatile matter of the second coal dust is not higher than 15wt%.Inventor has found, if adopted
With the coal of volatile matter too high (inferior quality), then effectively the iron in Iron Ore Powder cannot be reduced.
Embodiments in accordance with the present invention, the particle diameter of the second coal dust is not particularly restricted, and those skilled in the art can be with root
Selected according to being actually needed, according to a particular embodiment of the invention, the particle diameter of the second coal dust can be 1mm.Inventor passes through
Experiment finds, before the second pelletizing treatment is carried out, levigate can the significantly improving of the second coal dust is processed in sequential reduction in advance
In the second coal dust and Iron Ore Powder contact area, and then improve reduction efficiency of second coal dust to iron in Iron Ore Powder.Invention human hair
It is existing, by the second coal dust it is levigate to particle diameter be 1mm effects preferably, if the second coal particle size is excessive, the second coal dust and iron can be made
The contact area of miberal powder is too small, and then the second coal dust of influence is to the reduction efficiency of iron in Iron Ore Powder；And if the second coal dust ground
Carefully to smaller particle diameter, then can increase the energy consumption and cost of the levigate treatment of early stage.
According to a particular embodiment of the invention, can be in the treatment of the second pelletizing by kernel pelletizing and the second coal in adjustment
Allocating into than carbon-to-oxygen ratio in the composite carbon containing pellet that controls to prepare for powder is 1.05~1.20.Inventor is anticipated by many experiments
Other places discovery, if carbon-to-oxygen ratio is too low in composite carbon containing pellet, can cause the Iron Ore Powder in composite carbon containing pellet to be filled
Divide reduction, and if making carbon-to-oxygen ratio in composite carbon containing pellet too high, then need the amount of allocating of the second coal dust of raising high-quality, and then
Increase cost.
According to a particular embodiment of the invention, the particle diameter for processing the composite carbon containing pellet for preparing by the second pelletizing can
Think 9~15mm.Inventor has found, if the particle diameter of composite carbon containing pellet is excessive, can make composite carbon containing pellet follow-up straight
The heating surface area connect in reduction treatment is smaller, so as to reduce the efficiency of direct-reduction treatment.
There is embodiments in accordance with the present invention, rotary hearth furnace 300 composite carbon containing pellet entrance 301 and metallized pellet to export
302, composite carbon containing pellet entrance 301 is connected with composite carbon containing pellet outlet 205.It is possible thereby to composite carbon containing pellet is being turned into bottom
Direct-reduction treatment is carried out in stove 300, to obtain metallized pellet.
Specifically, in direct-reduction treatment, the agstone in kernel pelletizing can produce carbon dioxide, first
Coal dust can produce a large amount of volatile matters (escaping gas such as carbon monoxide, carbon dioxide, the hydrogen, methane) gas diffusing out
A large amount of spaces can be formed during kernel pelletizing in whole composite carbon containing pellet so that the porosity of composite carbon containing pellet
Increase, at the same time, the coal dust of high volatile first occurs gasification reaction and produces carbon monoxide, increases the reducing atmosphere inside pelletizing
By force, so as to improve the reduction efficiency to iron in metallized pellet.
Embodiments in accordance with the present invention, direct-reduction treatment is that 20~30min is carried out under 1100~1250 degrees Celsius is complete
Into.Inventor has found, be reduced directly treatment temperature is too low or the time too short can make agstone and first in kernel pelletizing
The decomposition of coal dust is insufficient, it is impossible to produces enough holes, and then causes the reduction efficiency reduction to iron in metallized pellet；And
If being reduced directly energy consumption temperature is too high or overlong time, direct-reduction treatment can be increased for the treatment of.
Thus, the system for preparing metallized pellet according to embodiments of the present invention is by by agstone, the first binding agent
With the first coal dust of high volatile carry out mixing and the first pelletizing treatment, obtain kernel pelletizing, further, within caryosphere group be
Core carries out the second pelletizing treatment, and the second relatively low coal dust of Iron Ore Powder, volatile matter and agstone are wrapped in into kernel pelletizing
Outer surface, and then obtain composite carbon containing pellet.The composite carbon containing pellet prepared by the above method is processed in direct-reduction
In, the coal dust of high volatile first in kernel pelletizing can produce a large amount of carbon monoxide, carbon dioxide, hydrogen, first at high temperature
The escaping gases such as alkane, the gas can form a large amount of in whole composite carbon containing pellet during diffusing out kernel pelletizing
Space so that the porosity of composite carbon containing pellet increases, at the same time, there is gasification reaction and produce one in the coal dust of high volatile first
Carbonoxide, strengthens the reducing atmosphere inside pelletizing, so as to improve the reduction effect of composite carbon containing pellet, and then improves metal
The degree of metalization of pellet.
Below with reference to specific embodiment, present invention is described, it is necessary to explanation, these embodiments are only description
Property, and the present invention is limited never in any form.
Embodiment 1
The granularity of the first pelletizing treatment agstone used is 75 μm, and the granularity of the first coal dust is 1mm, the first coal dust used
It is lignite (fixed carbon 31.28wt%, volatile matter 27.13wt%, ash content 12.6wt%, sulphur 0.47wt%) that used first bonds
Agent is starch solution, agstone, the first coal dust and the first binding agent in mass ratio 100:20:3 ratio fully mix after
The first pelletizing treatment is carried out on disk mixer, the kernel pellet size for obtaining is 4mm；In the treatment of second pelletizing, iron ore used
Powder, limestone granularity are 75 μm, and the second coal powder size is 1mm, and the second coal dust used is that (fixed carbon 83.59wt%, waves semi-coke
Hair point 6.05wt%, ash content 9.08wt%, sulphur 0.51wt%), the second binding agent used is starch solution, and addition is 5wt%,
Raw material with the first pelletizing kernel pelletizing for preparing for the treatment of is core after fully mixing, and second is carried out for 1.1 according to carbon-to-oxygen ratio
Pelletizing treatment, the granularity of the composite carbon containing pellet for obtaining is 12mm, and being supplied after composite carbon containing pellet is dried to rotary hearth furnace is carried out
Direct-reduction is processed, and rotary hearth furnace heating-up temperature is 1200 DEG C, and the heat time is 25min, and pelletizing degree of metalization is after roasting
90.30%, then carry out slag sluicing system.
Embodiment 2
The granularity of the first pelletizing treatment agstone used is 75 μm, and the granularity of the first coal dust is 1mm, the first coal dust used
It is lignite (fixed carbon 31.28wt%, volatile matter 27.13wt%, ash content 12.6wt%, sulphur 0.47wt%) that used first bonds
Agent is starch solution, agstone, the first coal dust and the first binding agent in mass ratio 100:20:3 ratios fully mix after in circle
The first pelletizing treatment is carried out on disk mixer, the kernel pellet size for obtaining is 5mm；In the treatment of second pelletizing, Iron Ore Powder used,
Limestone granularity is 75 μm, and the second coal powder size is 1mm, and the second coal dust used is semi-coke (fixed carbon 83.59wt%, volatilization
Divide 6.05wt%, ash content 9.08wt%, sulphur 0.51wt%), the second binding agent used is starch solution, and addition is 5wt%, former
Material with the first pelletizing kernel pelletizing for preparing for the treatment of is core after fully mixing, and carries out second and makes for 1.1 according to carbon-to-oxygen ratio
Ball treatment, the granularity of the composite carbon containing pellet for obtaining is 14mm, and being supplied after composite carbon containing pellet is dried to rotary hearth furnace is carried out directly
Reduction treatment is connect, rotary hearth furnace heating-up temperature is 1200 DEG C, and the heat time is 25min, and pelletizing degree of metalization is after roasting
91.25%, then carry out slag sluicing system.
Embodiment 3
The granularity of the first pelletizing treatment agstone used is 75 μm, and the granularity of the first coal dust is 1mm, the first coal dust used
It is lignite (fixed carbon 31.28wt%, volatile matter 27.13wt%, ash content 12.6wt%, sulphur 0.47wt%) that used first bonds
Agent is starch solution, agstone, the first coal dust and the first binding agent in mass ratio 100:20:3 ratio fully mix after
The first pelletizing treatment is carried out on disk mixer, the kernel pellet size for obtaining is 5mm；In the treatment of second pelletizing, iron ore used
Powder, limestone granularity are 75 μm, and the second coal powder size is 1mm, and the second coal dust used is that (fixed carbon 83.59wt%, waves semi-coke
Hair point 6.05wt%, ash content 9.08wt%, sulphur 0.51wt%), the second binding agent used is starch solution, and addition is 5wt%,
Raw material with the first pelletizing kernel pelletizing for preparing for the treatment of is core after fully mixing, and second is carried out for 1.2 according to carbon-to-oxygen ratio
Pelletizing treatment, the granularity of the composite carbon containing pellet for obtaining is 14mm, and being supplied after composite carbon containing pellet is dried to rotary hearth furnace is carried out
Direct-reduction is processed, and rotary hearth furnace heating-up temperature is 1250 DEG C, and the heat time is 30min, and pelletizing degree of metalization is after roasting
93.05%, then carry out slag sluicing system.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means to combine specific features, structure, material or spy that the embodiment or example are described
Point is contained at least one embodiment of the invention or example.In this manual, to the schematic representation of above-mentioned term not
Identical embodiment or example must be directed to.And, the specific features of description, structure, material or feature can be with office
Combined in an appropriate manner in one or more embodiments or example.Additionally, in the case of not conflicting, the skill of this area
Art personnel can be tied the feature of the different embodiments or example described in this specification and different embodiments or example
Close and combine.
Although embodiments of the invention have been shown and described above, it is to be understood that above-described embodiment is example
Property, it is impossible to limitation of the present invention is interpreted as, one of ordinary skill in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, changes, replacing and modification.
Claims (10)
1. a kind of method for preparing metallized pellet, it is characterised in that including：
Agstone, the first coal dust and the first binding agent are mixed and the treatment of the first pelletizing, to obtain kernel pelletizing；
By the kernel pelletizing mixed with Iron Ore Powder, agstone, the second coal dust and the second binding agent and the second pelletizing at
Reason, to obtain the composite carbon containing pellet with the kernel pelletizing as core, the volatile matter content of first coal dust is higher than institute
State the volatile matter content of the second coal dust；And
The composite carbon containing pellet is carried out into direct-reduction treatment in rotary hearth furnace, to obtain metallized pellet.
2. method according to claim 1, it is characterised in that the particle diameter of the agstone is 75 μm.
3. method according to claim 1, it is characterised in that first coal dust be in lignite and jet coal at least it
One,
Optionally, the volatile matter of first coal dust is not less than 20wt%,
Optionally, the particle diameter of first coal dust is 1mm.
4. method according to claim 1, it is characterised in that by the agstone, first coal dust and described
One binding agent is according to mass ratio 100：(20~25)：(3~5) carry out mixing and the treatment of the first pelletizing.
5. method according to claim 1, it is characterised in that the average grain diameter of the kernel pelletizing is 3~5mm.
6. method according to claim 1, it is characterised in that the particle diameter of the Iron Ore Powder is 75 μm.
7. method according to claim 1, it is characterised in that second coal dust be in semi-coke and coke at least it
One,
Optionally, the volatile matter of second coal dust is not higher than 15wt%,
Optionally, the particle diameter of second coal dust is 1mm.
8. method according to claim 1, it is characterised in that carbon-to-oxygen ratio in the composite carbon containing pellet for 1.05~
1.20,
Optionally, the average grain diameter of the composite carbon containing pellet is 9~15mm.
9. method according to claim 1, it is characterised in that the direct-reduction treatment is at 1100~1250 degrees Celsius
Under carry out 20~30min completion.
10. a kind of system for implementing the method for preparing metallized pellet any one of claim 1~9, its feature exists
In, including：
First palletizing device, first palletizing device has agstone entrance, the first coal powder entrance, the first binding agent entrance
Exported with kernel pelletizing；
Second palletizing device, second palletizing device has kernel pelletizing entrance, Iron Ore Powder entrance, the second coal powder entrance,
Two binding agent entrances and composite carbon containing pellet are exported, and the kernel pelletizing entrance is connected with kernel pelletizing outlet；
There is rotary hearth furnace, the rotary hearth furnace composite carbon containing pellet entrance and metallized pellet to export, and the composite carbon containing pellet enters
Mouth is connected with composite carbon containing pellet outlet.
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| CN113481364A (en) * | 2021-06-23 | 2021-10-08 | 东北大学 | Preparation method of vanadium titano-magnetite carbon-containing pellets suitable for rotary kiln iron-making process |
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