CN108103259A - A kind of oxide mineral prereduction device based on rotary hearth heating furnace - Google Patents
A kind of oxide mineral prereduction device based on rotary hearth heating furnace Download PDFInfo
- Publication number
- CN108103259A CN108103259A CN201810098765.1A CN201810098765A CN108103259A CN 108103259 A CN108103259 A CN 108103259A CN 201810098765 A CN201810098765 A CN 201810098765A CN 108103259 A CN108103259 A CN 108103259A
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- China
- Prior art keywords
- mineral
- rotary hearth
- furnace
- heating furnace
- prereduction
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000010438 heat treatment Methods 0.000 title claims abstract description 71
- 229910052592 oxide mineral Inorganic materials 0.000 title claims abstract description 32
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 29
- 239000011707 mineral Substances 0.000 claims abstract description 29
- 230000007246 mechanism Effects 0.000 claims abstract description 18
- 239000000463 material Substances 0.000 claims description 13
- 230000008676 import Effects 0.000 claims description 3
- 230000009467 reduction Effects 0.000 abstract description 16
- 230000003647 oxidation Effects 0.000 abstract description 5
- 238000007254 oxidation reaction Methods 0.000 abstract description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 25
- 238000006722 reduction reaction Methods 0.000 description 17
- 229910052742 iron Inorganic materials 0.000 description 13
- 239000003034 coal gas Substances 0.000 description 7
- 238000000197 pyrolysis Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 239000000571 coke Substances 0.000 description 5
- 238000009434 installation Methods 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000003763 carbonization Methods 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 206010022971 Iron Deficiencies Diseases 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 230000003064 anti-oxidating effect Effects 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 239000003610 charcoal Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000013507 mapping Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000010129 solution processing Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/08—Making spongy iron or liquid steel, by direct processes in rotary furnaces
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0046—Making spongy iron or liquid steel, by direct processes making metallised agglomerates or iron oxide
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0066—Preliminary conditioning of the solid carbonaceous reductant
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0073—Selection or treatment of the reducing gases
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Manufacture Of Iron (AREA)
Abstract
The present invention provides a kind of oxide mineral prereduction device based on rotary hearth heating furnace, the oxide mineral prereduction device is placed on rotary hearth heating furnace, communicates therewith and can rotate with it, the oxide mineral prereduction device includes the feeding mechanism and pre-reducing furnace that connect up and down, the lower end of wherein pre-reducing furnace forms open discharge port and is placed in rotary hearth heating furnace, and the upper end of the pre-reducing furnace offers residual gas outlet.High temperature heating gas in rotary hearth heating furnace can be introduced to by the present invention by progress mineral prereduction in prereduction device, improve the utilization rate of heating gas in rotary hearth heating furnace；Pre-reduction treatment early period of mineral is carried out using the present invention, accelerates the reduction treatment speed of rotary hearth heating furnace, the requirement to raw ore taste is reduced, improves to cheap smalls and high-grade, low grade oxidation ore object, poor, resource of tailings utilization.
Description
Technical field
The present invention relates to metallurgical reduction technique fields, and in particular to a kind of oxide mineral prereduction based on rotary hearth heating furnace
Device.
Background technology
Recently as steel industry grow rapidly China it is excessive to the mining inetesity of iron ore deposit, make a low multiple use and
The continuous increase of geological mapping difficulty so that the iron ore deposit that geological conditions is good, resource taste is high, sorting is good gradually decreases,
Sustainable supplying ability declines, reserved resources deficiency, and low-grade, the difficult iron ore deposit for selecting smelting will be studied as technique of preparing
One of emphasis.In the explored Iron Ore Reserve in China, iron ore is averagely sampled as 32%, and low 15 percentages are averagely sampled than the world
Point.Although iron ore total amount is big, it causes " taste ", " institutional " iron deficiency based on lean ore.It is expected that the year two thousand twenty, to protect
The output of steel of planning is demonstrate,proved to the demand of iron ore, 100,000,000 tons or so of ore will be lacked at that time.Therefore, low taste iron ore deposit is not
Come CHINESE INDUSTRIES and the highly important resource guarantee of strategic resource and important standby, strengthen low-grade iron ore comprehensive utilization of resources,
It is to ensure the key foundation that Domestic Resources are persistently supplied.
Many reduction production procedures cannot be accomplished sufficiently to show using it for the high temperature heating gas of generation at this stage：
1st, furnace high-temperature heating gas subparticipation burning redundance cannot make full use of；
2nd, residual gas Xun Huan is supplemented in stove and participates in burning and reduction caused by follow-up pyrolytic process, causes furnace high-temperature hot
Coal gas is further superfluous, good can not be used, and reduces the utilization rate of thermal energy.
Reducing process equipment also by coal-iron ratio, gas iron than being limited and being limited by raw material grade, to reduction ore and type
The taste requirement of coking coal is stringent.
The content of the invention
The present invention provides a kind of oxide mineral prereduction device based on rotary hearth heating furnace, can be that low grade oxidation ore object leads to
It crosses the heating gas for generating heating gas in rotary hearth furnace and heat carrier joint pyrolysis installation to recycle, improve to cheap end
Coal and high-grade, the utilization of low grade oxidation ore object, lean ore, resource of tailings.
In order to solve the above technical problems, the present invention adopts the following technical scheme that：
A kind of oxide mineral prereduction device based on rotary hearth heating furnace, the oxide mineral prereduction device, which is placed in, turns bottom heating
It on stove, communicates therewith and can rotate with it, the oxide mineral prereduction device includes the feeding mechanism that connects up and down and pre-
The lower end of reduction furnace, wherein pre-reducing furnace forms open discharge port and is placed in rotary hearth heating furnace, the upper end of the pre-reducing furnace
Offer residual gas outlet.
Further, the discharge port of the pre-reducing furnace has gap with rotary hearth heating furnace furnace bottom, and discharge port direction turns bottom
One side clearance of heating furnace direction of rotation is less than another side clearance backwards to rotary hearth heating furnace direction of rotation.
Further, raw mineral materials protection mechanism is communicated between the feeding mechanism and pre-reducing furnace, including mineral
Exhaust gas protecting bin and the cycle gas import for being opened in the mineral exhaust gas protecting bin upper end.
Preferably, between the feeding mechanism and mineral exhaust gas protecting bin and mineral exhaust gas protecting bin and pre-reducing furnace
It is both provided with lock material device.
Preferably, the feeding mechanism uses multiple feed hoppers being arranged side by side.
Preferably, it is provided with heating gas ingress pipe on the rotary hearth heating furnace.
From above technical scheme, the present invention has the advantages that：
1st, high temperature heating gas in rotary hearth heating furnace can be introduced to by the present invention by progress mineral prereduction in prereduction device,
Improve the utilization rate of heating gas in rotary hearth heating furnace；
2nd, pre-reduction treatment early period of mineral is carried out using the present invention, accelerates the reduction treatment speed of rotary hearth heating furnace, is reduced
Requirement to raw ore taste, is improved to cheap smalls and high-grade, low grade oxidation ore object, poor, resource of tailings utilization.
Description of the drawings
Fig. 1 is the integral layout schematic diagram of the invention used in rotary hearth heating furnace system；
Fig. 2 is A-A sectional views in Fig. 1, shows the internal structure of oxide mineral prereduction device.
Fig. 3 is B-B sectional views in Fig. 1, shows the internal structure of oxide mineral prereduction device.
Specific embodiment
A kind of preferred embodiment of the present invention is described in detail below in conjunction with the accompanying drawings.
As shown in Figure 1, the rotary hearth heating furnace 10 is the main furnace structure for being reduced to material, it is divided into straight
Flame heating zone 11 and radiant tube heating zone 12, wherein updraft Heating Zone Temperature are 550 degree, and the temperature of radiant tube heating zone is
1100 degree, which can be with rotation so that the material in stove can be cut between updraft heating zone and radiant tube heating zone
It changes, the coal gas of high temperature generated in rotary hearth heating furnace stove can enter oxide mineral prereduction device 20, and ore, Iron concentrate are carried out
Pre-add heat-treats.
In production technology, the formed coke that formed coke drying guipure machine 30 is sent into tiles to rotary hearth heating furnace furnace bottom, as turning bottom
The first via raw material 14 of heating furnace, and rotation is to the discharging portion at oxide mineral prereduction device behind updraft heating zone, in advance
Reduction mineral are layered on the top of formed coke again, as the second road raw material 15 of rotary hearth heating furnace, continue through radiant heating area after
Continuous high temperature reduction, the finished product thermal material after prereduction are entered further hot in subsequent pyrolysis installation 50 by hot discharge device 40
Solution processing.
The oxide mineral prereduction device 20 is placed on rotary hearth heating furnace, communicates therewith and can rotate with it, such as Fig. 2
Shown in 3, the oxide mineral prereduction device 20 includes the feeding mechanism 21,22 and of raw mineral materials protection mechanism that connect up and down
The lower end of pre-reducing furnace 23, wherein pre-reducing furnace forms open discharge port 24 and is placed in rotary hearth heating furnace.It will turn for convenience
Heating gas in hearth furnace introduces in pre-reducing furnace and carries out reduction reaction to mineral, and the discharge port of the pre-reducing furnace is with turning bottom
Bottom of Heating Furnace has gap, and a side clearance 241 of discharge port towards rotary hearth heating furnace direction of rotation is less than turns bottom heating backwards
Another side clearance 242 of stove direction of rotation.
The height of the discharge port towards a side clearance 241 of rotary hearth heating furnace direction of rotation is equal to the of rotary hearth heating furnace
The sum of raw material and the second road raw thickness all the way, the discharge port is backwards to another side clearance 242 of rotary hearth heating furnace direction of rotation
Height it is suitable with the inside wall height of rotary hearth heating furnace, formed coke can be allowed in rotary hearth heating furnace by a large amount of of high temperature carbonization release
Pyrolysis gas rapidly enters pre-reducing furnace, penetrates ore, Iron concentrate layer makes it reduce at high temperature, and lead-in portion circulating gas
Ensure enough reducing gas by radiant heating, the coal gas of high temperature which generates from pyrolysis installation, and lead to
The heating gas ingress pipe 13 set on rotary hearth heating furnace is crossed to enter.
The upper end of the pre-reducing furnace 23 offers residual gas outlet 231, what oxide mineral prereduction device generated
Residual gas are discharged by the residual gas outlet in subsequent purifier, after then being advertised by residual gas wind turbine again
Into rotary hearth heating furnace and participate in reduction reaction.
The raw mineral materials protection mechanism 22 uses mineral exhaust gas protecting bin, and sets and follow in mineral exhaust gas protecting bin upper end
Ring exhaust gas inlet 221 is anti-oxidation in order to carry out positive pressure to oxide mineral prereduction device by the positive pressure characteristic of cycle gas
Protection prevents that residual gas flow into feeding mechanism in pre-reducing furnace, have an impact charging.
Quantitative control is carried out for convenience, and the first lock material dress is provided between the feeding mechanism and mineral exhaust gas protecting bin
25 are put, the second lock material device 26 is provided between mineral exhaust gas protecting bin and pre-reducing furnace, wherein the second lock material device is quantitatively adjusted
Oxide mineral is saved, the temperature of oxide mineral reduction apparatus reduction is controlled and reserved certain space is surplus to being come out through pre-reducing furnace
Remaining coal gas is gathered, recycling after then being handled by the submitting of residual gas outlet.
The feeding mechanism 21 uses three feed hoppers being arranged side by side, corresponding, the discharging of mineral exhaust gas protecting bin 22
Mouth is also provided with three.
Heating gas is reduced as oxide mineral in the stove that the present invention is generated by the use of formed coke carbonization main reducing gas, pyrolysis generate
Pyrolysis coal gas be time reducing gas, heat type is burnt and hot semicoke particle in charcoal be solid reductant, remain it is enough also
Former agent remains superfluous reducing atmosphere, and so as to improve reduction efficiency, prereduction twice is reduced will to tcrude ore taste
The limitation asked improves cheap smalls and high-grade, low grade oxidation ore object, poor, resource of tailings utilization.
The operation principle of oxide mineral prereduction device of the present invention：
Mineral to be oxidized enter through feeding mechanism 21, and pass through 25 dosing of the first lock material device and enter mineral exhaust gas protecting bin
In 22, it is simultaneously from the cycle gas in technique and also enters by cycle gas import 221 in mineral exhaust gas protecting bin, by just
Pressure is locked to oxide mineral；The mineral of mineral exhaust gas protecting bin expect that device 26 quantitatively enters in pre-reducing furnace 23 through the second lock, and
Quantitatively control pre-reduction temperature, yield and reduction effect.
The furnace body surrounding refractory brick thermal resistance of pre-reducing furnace 23,24 open design of discharge port into right low left high, open by the left side
Mouth enters pre-reducing furnace convenient for heating gas rapid, high volume in stove greatly and carries out abundant prereduction；Right side opening is small pre- convenient for control tiling
Reduce the thickness and treating capacity of mineral.The residual gas generated during oxide mineral prereduction are sent by residual gas outlet 231
Rotary hearth heating furnace is returned again to after to subsequent processing processing to recycle.The heat looped back simultaneously from subsequent pyrolysis installation remains
Remaining coal gas supplements coal gas by heating gas ingress pipe 13 into rotary hearth heating furnace, participates in burning and reduction.
Embodiment described above is only that the preferred embodiment of the present invention is described, not to the model of the present invention
It encloses and is defined, on the premise of design spirit of the present invention is not departed from, those of ordinary skill in the art are to the technical side of the present invention
The various modifications and improvement that case is made should all be fallen into the protection domain that claims of the present invention determines.
Claims (6)
- A kind of 1. oxide mineral prereduction device based on rotary hearth heating furnace, which is characterized in that the oxide mineral prereduction dress It is placed on rotary hearth heating furnace, communicates therewith and can rotate with it, the oxide mineral prereduction device includes connection up and down Feeding mechanism and pre-reducing furnace, the lower end of wherein pre-reducing furnace forms open discharge port and is placed in rotary hearth heating furnace, should The upper end of pre-reducing furnace offers residual gas outlet.
- 2. oxide mineral prereduction device according to claim 1, which is characterized in that the discharge port of the pre-reducing furnace with Rotary hearth heating furnace furnace bottom has gap, and a side clearance of discharge port towards rotary hearth heating furnace direction of rotation is less than turns bottom heating backwards Another side clearance of stove direction of rotation.
- 3. oxide mineral prereduction device according to claim 1, which is characterized in that the feeding mechanism and pre-reducing furnace Between be communicated with raw mineral materials protection mechanism, including mineral exhaust gas protecting bin and be opened in the mineral exhaust gas protecting bin upper end Cycle gas import.
- 4. oxide mineral prereduction device according to claim 3, which is characterized in that the feeding mechanism and mineral exhaust gas Lock material device is both provided between protecting bin and mineral exhaust gas protecting bin and pre-reducing furnace.
- 5. according to claim 1-4 any one of them oxide mineral prereduction devices, which is characterized in that the feeding mechanism is adopted With multiple feed hoppers being arranged side by side.
- 6. according to claim 1-4 any one of them oxide mineral prereduction devices, which is characterized in that the rotary hearth heating furnace On be provided with heating gas ingress pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810098765.1A CN108103259A (en) | 2018-01-31 | 2018-01-31 | A kind of oxide mineral prereduction device based on rotary hearth heating furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810098765.1A CN108103259A (en) | 2018-01-31 | 2018-01-31 | A kind of oxide mineral prereduction device based on rotary hearth heating furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108103259A true CN108103259A (en) | 2018-06-01 |
Family
ID=62221676
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810098765.1A Pending CN108103259A (en) | 2018-01-31 | 2018-01-31 | A kind of oxide mineral prereduction device based on rotary hearth heating furnace |
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| Country | Link |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3743475A (en) * | 1971-05-20 | 1973-07-03 | Salem Corp | Central shaft feeding for rotary hearth furnace |
| JP2001247920A (en) * | 2000-03-06 | 2001-09-14 | Kawasaki Heavy Ind Ltd | Smelting reduction method and smelting reduction apparatus |
| WO2009031537A1 (en) * | 2007-09-05 | 2009-03-12 | Nippon Steel Corporation | Process for manufacturing molded products of direct-reduced iron and process for manufacturing pig iron |
| CN106191364A (en) * | 2016-09-13 | 2016-12-07 | 江苏省冶金设计院有限公司 | A kind of system and method utilizing wet piece of lateritic nickel ore direct-reduction to produce granulated iron |
| CN207958419U (en) * | 2018-01-31 | 2018-10-12 | 新疆乾海环保科技有限公司 | A kind of oxide mineral prereduction device based on rotary hearth heating furnace |
-
2018
- 2018-01-31 CN CN201810098765.1A patent/CN108103259A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3743475A (en) * | 1971-05-20 | 1973-07-03 | Salem Corp | Central shaft feeding for rotary hearth furnace |
| JP2001247920A (en) * | 2000-03-06 | 2001-09-14 | Kawasaki Heavy Ind Ltd | Smelting reduction method and smelting reduction apparatus |
| WO2009031537A1 (en) * | 2007-09-05 | 2009-03-12 | Nippon Steel Corporation | Process for manufacturing molded products of direct-reduced iron and process for manufacturing pig iron |
| CN106191364A (en) * | 2016-09-13 | 2016-12-07 | 江苏省冶金设计院有限公司 | A kind of system and method utilizing wet piece of lateritic nickel ore direct-reduction to produce granulated iron |
| CN207958419U (en) * | 2018-01-31 | 2018-10-12 | 新疆乾海环保科技有限公司 | A kind of oxide mineral prereduction device based on rotary hearth heating furnace |
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Application publication date: 20180601 |
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