CN103924024B - A kind of iron-bath molten reduction stove prereduction method - Google Patents
A kind of iron-bath molten reduction stove prereduction method Download PDFInfo
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- CN103924024B CN103924024B CN201310008087.2A CN201310008087A CN103924024B CN 103924024 B CN103924024 B CN 103924024B CN 201310008087 A CN201310008087 A CN 201310008087A CN 103924024 B CN103924024 B CN 103924024B
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Abstract
The invention discloses a kind of iron-bath molten reduction stove prereduction method, coal and iron ore are directly added in whirlwind melting separator, semicoke is formed in whirlwind melting separator, and mix mutually with the mineral aggregate of fusing, after forming the molten mixture of prereduction mineral aggregate and semicoke, enter whole reduction unit, both avoided semicoke to be formed in whole reduction molten bath, save the heat that semicoke is spent in forming process in molten bath, molten bath is made more easily to remain on high temperature, semicoke is more abundant with mixing of slag, improve the reducing power in molten bath, meanwhile, the semicoke formed in whirlwind melting separator, the mineral aggregate that can melt with prereduction is just mixed preferably before entering molten bath, thus in whirlwind melting separator, just can play the reductive action of semicoke to ferric oxide in fusing prereduction mineral aggregate, improve the prereduction degree in whirlwind melting separator.
Description
Technical field
The present invention relates to iron-bath molten reduction technique, more particularly, relate to a kind of iron-bath molten reduction stove prereduction method.
Background technology
Up to the present existing CCF (CycloneConverterFurnace) iron-bath molten reduction method produces molten iron technology is, through the comparison of multiple melting reduction method, is considered to the iron bath class melting reduction method having very much Commercial Prospect.
The party's two-step approach owned by France, mainly comprise " prereduction+prereduction breeze fusing " (melting at least partly) and iron bath end reducing two portions, wherein, " prereduction+prereduction breeze fusing " unit equipment is fusion cyclone (MeltingCyclone) or whirlwind melting separator, and the iron bath end reducing unit be positioned at below " prereduction+prereduction fusing " unit is the band slag metallurgical tank similar to converter profile." fusing of prereduction breeze " unit is sitting on iron bath end reducing unit, forms the reduction furnace of integration.
The flow process of the method is powdered iron ore process, powdered iron ore prereduction+molten iron is produced in fusing at least partly, eventually reduction, molten iron slag is separated, and in " powdered iron ore prereduction+melt at least partly " step, comprises following three main contents:
(1) first iron ore (or all iron content be greater than 45% ferrous material) is sent in fusion cyclone, and utilize the reduction process gas that derives from whole reduction unit by iron ore (or all iron content be greater than 45% ferrous material) prereduction herein.(2) in fusion cyclone, provide oxygen to make reduction process gas carry out after-burning, prereduction breeze is melted (melting at least partly) in fusion cyclone; (3) iron ore (or ferrous material) making prereduction also melt at least partly flows into the whole reduction unit of band slag metallurgical tank be arranged in below it, finally reduces wherein, produces molten iron.
In whole reduction unit, coal and oxygen are fed, in slag blanket, carry out final reduction and form reduction process gas thus.Process gas is by the oxygen-containing gas partial combustion feeding in slag and on slag in sheaf space.Coal directly feeds in slag blanket with the form of solid particulate.The direct infeed mode of coal is at least one of following manner: 1) directly sprayed in slag blanket by fine powder broken coal by least one crosswind mouth of whole reduction unit.2) fine powder broken coal is sprayed in slag blanket by the pulverized coal gun being inserted whole reducer by fusion cyclone.3) coal grain mean particle size being not less than 6mm is left in slag blanket by the chute of whole reduction unit top or side wall.
The defect that CCF coal technology exists is: 1) directly add the coal dust in molten bath (molten iron or melt cinder) or coal particle or both combinations; rising mild pyrolysis at it is formed in semicoke process; absorb more heat; this reduces making the temperature of whole reduction unit molten iron bath; the reduction rate of reduction zone declines, and reduces reduction rate and the efficiency of whole reduction unit.Meanwhile, in slag, the content of iron protoxide is also higher, and it is unfavorable to increase the life-span of molten iron bath.2) in CCF technology, directly add the coal in molten bath and mineral aggregate without abundant premix, therefore, the degree that the semicoke formed in whole reduction unit molten bath mixes with ferric oxide in slag, contact is poor, decrease the reduction interface of semicoke and ferric oxide, after entering whole reduction molten bath in addition, the concentration of iron protoxide declines rapidly, reduce further reduction rate and the efficiency of whole reduction unit.
Summary of the invention
For the above-mentioned shortcoming existed in prior art, the object of this invention is to provide a kind of iron-bath molten reduction stove prereduction method, while strengthening the prereduction degree in whirlwind melting separator further, the ability of molten bath reduction in further increase end reducing furnace and efficiency, and improve the life-span of whole reduction unit body of heater.
For achieving the above object, the present invention adopts following technical scheme:
This iron-bath molten reduction stove prereduction method, coal dust is mixed mutually with powdered iron ore or ferric oxide material, be blown in separator along the tangential direction of separator respectively by the multilayer dose spray gun of whirlwind melting separator, be blown into oxygen by multilayer oxygen lance along the tangential direction of separator simultaneously.
In the coal iron mixture that every layer of described material spray gun is blown into, the additional proportion of coal dust increases progressively by direction from down to up.
In described adjacent two layers material spray gun, the ratio of the ton ore deposit mixed coal weight of the coal iron mixture that lower floor's material spray gun and upper materials spray gun are blown into is in 1:1.0 ~ 2.5.
The blowing oxygen quantity of every layer of described oxygen lance increases with coal amount, and adding oxygen surplus coefficient is 0 ~ 0.05.
In the coal iron mixture that every layer of described material spray gun is blown into, being also added with calcium oxide or at high temperature being formed with calcium oxide is the flux of principal constituent.
The add-on of described calcium oxide is: make to enter the ratio of the total amount of calcium oxide in the reduction fusing mineral aggregate in whole reduction reactor molten bath and iron protoxide and calcium oxide at 11 ~ 16wt%.
In technique scheme, iron-bath molten reduction stove prereduction method of the present invention, coal and iron ore are directly added in whirlwind melting separator, semicoke is formed in whirlwind melting separator, and mix mutually with the mineral aggregate of fusing, after forming the molten mixture of prereduction mineral aggregate and semicoke, enter whole reduction unit, both avoided semicoke to be formed in whole reduction molten bath, save the heat that semicoke is spent in forming process in molten bath, molten bath is made more easily to remain on high temperature, semicoke is more abundant with mixing of slag, improve the reducing power in molten bath, meanwhile, the semicoke formed in whirlwind melting separator, the mineral aggregate that can melt with prereduction is just mixed preferably before entering molten bath, thus in whirlwind melting separator, just can play the reductive action of semicoke to ferric oxide in fusing prereduction mineral aggregate, improve the prereduction degree in whirlwind melting separator.In addition, by the reduction reaction of mineral aggregate and coal and add flux to the adjustment of melting mineral aggregate composition, semicoke and prereduction can be made to melt mineral aggregate fit better, while strengthening the prereduction degree in whirlwind melting separator further, also further increase ability and the efficiency of molten bath reduction in end reducing furnace, improve the life-span of whole reduction unit body of heater.And the optimization of oxygen add-on in whirlwind melting separator, then what wherein semicoke can be made to be formed is more abundant, plays the effect of prereduction better.
Embodiment
Technical scheme of the present invention is further illustrated below in conjunction with drawings and Examples.
Iron-bath molten reduction stove prereduction method of the present invention is specific as follows:
Coal dust is mixed mutually with powdered iron ore or ferric oxide material, is blown in separator along the tangential direction of separator respectively by the multilayer dose spray gun of whirlwind melting separator, be blown into oxygen by multilayer oxygen lance along the tangential direction of separator simultaneously.In the coal iron mixture that every layer of material spray gun is blown into, the additional proportion of coal dust increases progressively by direction from down to up.In described adjacent two layers material spray gun, the ratio of the ton ore deposit mixed coal weight of the coal iron mixture that lower floor's material spray gun and upper materials spray gun are blown into is in 1:1.0 ~ 2.5 scope.
When determining the volatile matter (composition, content) of coal, and by coal total amount and the coal amount directly adding molten bath, after determining to add the coal amount in whirlwind melting separator, determine to add coal amount volatile matter in whirlwind melting separator all to burn required oxygen amount, afterwards, the oxygen amount that the oxygen amount being increased to every layer of oxygen rifle is all burnt required by volatile matter contained by the coal amount in the solids lances on it is distributed, now, the volume increased because coal adds is defined as zero for oxygen surplus coefficient.The blowing oxygen quantity of every layer of described oxygen lance increases with coal amount, and volume is 0 ~ 0.05 for oxygen surplus coefficient.
And in the coal iron mixture that every layer of described material spray gun is blown into, being also added with calcium oxide or at high temperature being formed with calcium oxide is the flux of principal constituent.The add-on of described calcium oxide is: make to enter the ratio of the total amount of calcium oxide in the reduction fusing mineral aggregate in whole reduction reactor molten bath and iron protoxide and calcium oxide at 11 ~ 16wt%.
Concrete example explanation is carried out to the present invention below:
Embodiment 1
Select the medium volatile matter fine coal of 32MJ/ kilogram to be mixed in concentrate, add-on is ton iron 650 kilograms, and colliery mixture all adds in whirlwind melting separator, and the ton ore deposit mixed coal ratio that adjacent layers increases elects 2 as.
Be mixed into by lime in the mixture of colliery, the lime adding amount of 95% calcium oxide content is 132 kilograms, ton ore deposit, and the iron-holder of concentrate is 61.35%.
Empirical tests, compares with the prior art under the condition of ore deposit with identical coal, and whole reduced iron productive rate of the present invention improves 20%.
Embodiment 2
Similar to the above embodiments, difference is that lime adding amount reduces to 80.2 kilograms by 132 kilograms, compares with the prior art under the condition of ore deposit with identical coal, and whole reduced iron productive rate improves 15%.
Adopt prereduction method of the present invention, the potentiality improving prereduction degree compared with prior art are 5 ~ 15wt%, and the potentiality improving whole rate of reduction are 5 ~ 25wt%, and the potentiality improving reduction furnace overall reduction efficiency are 10 ~ 40%.
Reason is as follows:
1) the burnt ore deposit premix in whirlwind melting separator, improves carbon reduction reaction interface, and because of iron protoxide concentration high, improve the prereduction degree of ferric oxide.
2) adjustment of Jiao Kuang reaction and slag ingredient, reduces semicoke and the interfacial tension in fusing ore deposit, makes the better effects if that Jiao Kuang mixes
3) Jiao's temperature entering end reducing furnace significantly improves, and eliminates pyrolysis of coal and physics in molten bath and to heat up the temperature drop caused, significantly improve reduction rate and the efficiency of end reducing furnace.
4) in addition, enter the raising of melting prereduction degree in ore deposit in molten bath, make the mean value of ferrous content in the slag of whole reduction molten bath more easy to control at below 5wt%, thus improve the life-span of end reducing furnace generation stove labour.Infer by resistance to material erosive velocity, life longer 0.5 ~ 1 times.
Those of ordinary skill in the art will be appreciated that, above embodiment is only used to the present invention is described, and be not used as limitation of the invention, as long as in spirit of the present invention, all will drop in Claims scope of the present invention the change of the above embodiment, modification.
Claims (4)
1. an iron-bath molten reduction stove prereduction method, is characterized in that:
Coal dust is mixed mutually with powdered iron ore or ferric oxide material, is blown in separator along the tangential direction of separator respectively by the multilayer dose spray gun of whirlwind melting separator, be blown into oxygen by multilayer oxygen lance along the tangential direction of separator simultaneously; In the coal iron mixture that every layer of material spray gun of described multilayer dose spray gun is blown into, the additional proportion of coal dust increases progressively by direction from down to up.
2. iron-bath molten reduction stove prereduction method as claimed in claim 1, is characterized in that:
In described multilayer oxygen lance, the blowing oxygen quantity of every layer of oxygen lance increases with coal amount, and adding oxygen surplus coefficient is 0 ~ 0.05.
3. iron-bath molten reduction stove prereduction method as claimed in claim 1, is characterized in that:
In the coal iron mixture that every layer of material spray gun of described multilayer dose spray gun is blown into, being also added with calcium oxide or at high temperature being formed with calcium oxide is the flux of principal constituent.
4. iron-bath molten reduction stove prereduction method as claimed in claim 3, is characterized in that:
The add-on of described calcium oxide is: make to enter the ratio of the total amount of calcium oxide in the reduction fusing mineral aggregate in whole reduction reactor molten bath and iron protoxide and calcium oxide at 11 ~ 16wt%.
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| CN201310008087.2A CN103924024B (en) | 2013-01-10 | 2013-01-10 | A kind of iron-bath molten reduction stove prereduction method |
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| CN103924024B true CN103924024B (en) | 2016-02-24 |
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| CN105296698A (en) * | 2014-07-30 | 2016-02-03 | 宝山钢铁股份有限公司 | Method for manufacturing iron by smelting reduction through gas and semicoke |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3462263A (en) * | 1965-08-11 | 1969-08-19 | John H Walsh | Reduction of iron ore |
| CN1141345A (en) * | 1995-02-13 | 1997-01-29 | 霍戈文斯·斯塔尔公司 | Process and apparatus for producing molten pig iron |
| CN1144275A (en) * | 1995-03-29 | 1997-03-05 | 霍戈文斯·斯塔尔公司 | Apparatus for producing molten pig iron by direct reduction |
| CN1259172A (en) * | 1997-07-11 | 2000-07-05 | 霍戈文斯·斯塔尔公司 | Method for controlling a smelting reduction process |
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2013
- 2013-01-10 CN CN201310008087.2A patent/CN103924024B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3462263A (en) * | 1965-08-11 | 1969-08-19 | John H Walsh | Reduction of iron ore |
| CN1141345A (en) * | 1995-02-13 | 1997-01-29 | 霍戈文斯·斯塔尔公司 | Process and apparatus for producing molten pig iron |
| CN1144275A (en) * | 1995-03-29 | 1997-03-05 | 霍戈文斯·斯塔尔公司 | Apparatus for producing molten pig iron by direct reduction |
| CN1259172A (en) * | 1997-07-11 | 2000-07-05 | 霍戈文斯·斯塔尔公司 | Method for controlling a smelting reduction process |
Non-Patent Citations (1)
| Title |
|---|
| 旋流转炉式炼铁炉;J.Van Langen等;《武钢技术》;19941231;第19-23页 * |
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