CN108300851A - A kind of HIsmelt iron-bearing materials preheating pre-reduction treatment technique - Google Patents
A kind of HIsmelt iron-bearing materials preheating pre-reduction treatment technique Download PDFInfo
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- CN108300851A CN108300851A CN201810098016.9A CN201810098016A CN108300851A CN 108300851 A CN108300851 A CN 108300851A CN 201810098016 A CN201810098016 A CN 201810098016A CN 108300851 A CN108300851 A CN 108300851A
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- iron
- bearing material
- hismelt
- bearing
- rotary kiln
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Classifications
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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
- C22B1/02—Roasting processes
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B11/00—Making pig-iron other than in blast furnaces
Abstract
The present invention relates to a kind of HIsmelt iron-bearing materials to preheat pre-reduction treatment technique, this method realizes the preheating and prereduction of iron-bearing material using rotary kiln, iron-bearing material is set to reach certain reduction degree, further heating makes the outlet temperature of iron-bearing material reach 650 DEG C or more simultaneously, iron-bearing material is discharged into hot mine bucket elevator through rotary kiln outlet, and iron-bearing material is sent into the hot mineral aggregate bucket of hot mine injection system by bucket elevator.Involved scheme has the following advantages and advantageous effect：First, prereduction technique is preheated compared to conventional fluidization bed, which has widened the granularity scope of application of iron-bearing material, avoided the bonding defluidization problem in warm, substantially increase the operation ratio of equipment entirety；Secondly, iron-bearing material treating capacity is big when this method has many advantages, such as easy to operate, reliable for operation, single, prepares ensureing that efficient, the steady production of HIsmelt techniques provide important pretreatment；Meanwhile process makes full use melting and reducing furnace exhaust gas preheating, it realizes waste heat and efficiently utilizes.
Description
Technical field
The present invention relates to smelting reduction ironmaking field, especially a kind of HIsmelt iron-bearing materials preheat pre-reduction treatment work
Skill.
Background technology
HIsmelt refinings melting and reducing iron process is one kind using mill coal as main energy sources, directly using iron-bearing material etc.
Raw material is reduced into ferriferous oxide with carbon under high temperature fused state the smelting process of metallic iron.This method does not have to coke, sintering
Mine and pellet, greatly reduced CO2、NOxWith two dislike because discharge, have simple for process, resource and efficiency of energy utilization
High, the advantages that environmental pollution is small, there is very bright application prospect, be also the hot spot of iron industry research all the time.
HIsmelt refinings melting and reducing iron process is to last exploitation in more than 30 years by Rio Tinto Group to complete, and is the forward position of current field of metallurgy
Technology, in Shandong Province of China Mo Long petroleum machineries limited liability company in 2012（Hereinafter referred to as Shandong ink dragon）By the success of this technology
It introduces, and technological process apparatus is advanced optimized on the basis of Kui Nana shop equipments, build up unique set HIsmelt meltings also
Former ironmaking production factory, the application of this technology is for reducing steel industry carbon emission, environmental protection and solving the problems, such as iron ore deposit
It is of great significance.Shandong Mo Longyi Rio Tinto PLCs group formally contracts, and all knowledge that HIsmelt technologies are transferred the possession of with Xiang Molong are produced
Power, patent and trade mark etc., digesting and assimilating completely for HIsmelt technologies has been completed in Shandong ink dragon.
Prior, HIsmelt melting and reducings preheating prereduction system can improve the preheating temperature of iron-bearing material, increase
Iron-bearing material prereduction degree reduces, pollutant emission to improve the production efficiency of melting and reducing.The iron content of Kui Nana factories
The problems such as raw material preheating system mainly uses fluid bed, which bonds defluidization there are iron-bearing material, pre-heating system faults frequent,
Cause equipment operation rate low, in view of this, the rotary kiln technology that Shandong ink dragon uses technically reliable by technological innovation is realized
The purpose of heating, the prereduction of iron-bearing material, and technology maturation, stable equipment operation, operating rate are high, realize HIsmelt's
Trouble-free operation.
The technical issues of occurring for the preheating prereduction of HIsmelt operational process iron-bearing materials, the present invention provides a kind of
HIsmelt iron-bearing materials preheat pre-reduction treatment technique, and this method heats the iron-bearing material for entering stove using rotary kiln, together
When so that iron-bearing material is achieved the purpose that part prereduction.Prereduction technique is preheated compared to conventional fluidization bed, which widens
The granularity scope of application of iron-bearing material avoids the bonding defluidization problem in warm, substantially increases the fortune of equipment entirety
Row rate, to ensureing that efficient, the steady production of HIsmelt techniques provide important precondition.
Invention content
The invention content of the present invention is to provide a kind of HIsmelt iron-bearing materials preheating pre-reduction treatment technique, this method
The preheating and prereduction of iron-bearing material are realized using rotary kiln.After preheating in rotary kiln and prereduction technique, iron-bearing material is made to reach
To certain reduction degree, while further so that the outlet temperature of iron-bearing material reaches 650 DEG C or more, iron-bearing material passes through back for heating
Rotary kiln outlet is discharged into hot mine bucket elevator, and iron-bearing material is sent into the hot mine of hot mine injection system by bucket elevator
Hopper.The technique has widened the granularity scope of application of iron-bearing material, avoids the bonding defluidization problem in warm, carries significantly
The high operation ratio of equipment entirety, important precondition is provided to efficient, the steady production of guarantee HIsmelt techniques.
The present invention relates to a kind of HIsmelt iron-bearing materials to preheat pre-reduction treatment technique, which is characterized in that the technique is adopted
The preheating and prereduction that iron-bearing material is realized with rotary kiln make iron-bearing material reach certain reduction degree, while further heating
So that the outlet temperature of iron-bearing material reaches 650 DEG C or more, specifically comprise the following steps：
The first, iron-bearing material first with 0 ~ 10% flux after mixing, into drying rotary kiln dried, remove raw material in
Moisture, and preliminary preheating is carried out to raw material；
The second, after drying kiln drying, the iron-bearing material row tentatively preheated is sieved, thin after drying in iron-bearing material is removed
Grain；
Third, after sieving granularity are more than 2mm and are less than or equal to that 0 ~ 8% reduction coal dust or coke are added in the iron-bearing material of 10 mm
Powder, mixture, which is added to by belt-conveying in high temperature rotary kiln, carries out preheating and prereduction；
4th, after high temperature rotary kiln is handled, mixture is sent into hot ore storage bin by bucket elevator, passes through two or more pieces heat
Mine injection system sprays into fusion reducing furnace（SRV stoves）.
In the step 1 iron-bearing material refer to all be used for melting and reducing ferrous materials, can be red iron-bearing material,
The granularity of magnetic iron-bearing material, steel-smelting sewage sludge either iron-containing dust etc., these iron-bearing materials is 0 ~ 10 mm.
In the step 1 flux refer to according to melting and reducing need it is to be added containing magnesium, contain calcium flux, can be dolomite,
The granularity of lime stone, quick lime etc., these flux is 0 ~ 10 mm, with addition of 0 ~ 10% that ratio is iron-bearing material quality.
The temperature range of drying kiln is 100 ~ 300 DEG C in the step 1, and the mode of heating can be returned by high temperature
Rotary kiln tail gas heating or the heating of other process tail gas.
Can be without drying kiln drying in the step 1, and it is directly entered high-temperature pre-heat prereduction rotary kiln.
It refers to that granularity is former less than the fine fraction iron content of 2mm that the fine grained after drying in iron-bearing material is removed in the step 2
Material.
The fuel being added in the step 3 is mainly used for high temperature prereduction, can with addition of coal dust or coke powder, coal dust
Can be 0 ~ 6% with dosage, the proportioning of coal dust can be adjusted according to the needs of actual production, can not also coal powder, it is only simple
Improve the temperature of mixture.
High temperature rotary kiln temperature range in the step 3 is 700 ~ 1200 DEG C, and the mode of heating can pass through combustion
It burns natural gas or other fuel gas, combusting coal fines or sprays into SRV producer gas simultaneously.
In order to ensure the reproducibility atmosphere of high temperature rotary kiln in the step 3, flue gas analysis is disposed in the kiln hood of rotary kiln
Device ensures that CO contents are more than 20%, O in revolution2Content be less than 20%.
Mixture is sent into hot ore storage bin library by bucket elevator in the step 4, and mixture passes through the hot mine of two or more pieces
Injection system enters fusion reducing furnace.
Advantages of the present invention and effect：The present invention relates to a kind of HIsmelt iron-bearing materials to preheat pre-reduction treatment technique, should
Method realizes the preheating and prereduction of iron-bearing material using rotary kiln, and iron-bearing material is made to reach certain reduction degree, while into one
Step heating is so that the outlet temperature of iron-bearing material reaches 650 DEG C or more, and involved scheme has the following advantages and advantageous effect：
First, prereduction technique is preheated compared to conventional fluidization bed, which has widened the granularity scope of application of iron-bearing material, avoided
Bonding defluidization problem in warm, substantially increases the operation ratio of equipment entirety；Secondly, this method have it is easy to operate,
The advantages that iron-bearing material treating capacity is big when reliable for operation, single, to ensureing that efficient, the steady production of HIsmelt techniques provide weight
The pretreatment wanted prepares；Meanwhile process makes full use melting and reducing furnace exhaust gas preheating, it realizes waste heat and efficiently utilizes.
Description of the drawings
Fig. 1 is that HIsmelt iron-bearing material double back rotary kilns preheat pre-reduction treatment technique.
Fig. 2 is HIsmelt iron-bearing material list preheating in rotary kiln pre-reduction treatment techniques.
Fig. 3 is HIsmelt iron-bearing material double back rotary kiln the pre-heat treatment techniques.
Fig. 4 is HIsmelt iron-bearing material list preheating in rotary kiln treatment process.
Specific implementation mode
Embodiment 1：HIsmelt iron-bearing material double back rotary kilns preheat pre-reduction treatment technique
As shown in Figure 1, after the mixing of 120t iron-bearing materials, 13.5t dolomites, first passes around 200 DEG C of drying rotary kilns and is dried,
Its mode heated can to remove the moisture in raw material, and be carried out just to raw material by high temperature rotary kiln tail gas heating
The preheating of step；After drying kiln drying, the iron-bearing material tentatively preheated is sieved, is removed thin in iron-bearing material after drying
Particle, is added the coal dust of 3.6t in iron-bearing material of the granularity more than 2 ~ 10 mm after screening, mixture is added to by belt-conveying
Preheating and prereduction are carried out in high temperature rotary kiln；After high temperature rotary kiln is handled, mixture temperature is more than 650 DEG C, prereduction
Degree is sent into hot ore storage bin more than 5% by bucket elevator, and fusion reducing furnace is sprayed by the hot mine injection system of two or more pieces
（SRV stoves）.
Embodiment 2：HIsmelt iron-bearing material list preheating in rotary kiln pre-reduction treatment techniques
As shown in Fig. 2, after the mixing of 120t iron-bearing materials, 13.5t dolomites, the iron-bearing material tentatively preheated is sieved, is removed
The fine grained in iron-bearing material after drying is removed, the coal dust of 3.6t is added after screening in iron-bearing material of the granularity more than 2 ~ 10 mm, mixes
Close material be added in rotary kiln by belt-conveying carry out preheat and prereduction, rotary kiln mainly pass through coal dust firing and SRV stoves
Top coal air lift heating load, kiln temperature section is from kiln hood to 200 ~ 1200 DEG C of kiln tail；After revolution rotary kiln processing, mixing
Material temperature degree is more than 650 DEG C, and prereduction degree is more than 5%, and hot ore storage bin is sent by bucket elevator, is sprayed by the hot mine of two or more pieces
It blows system and sprays into fusion reducing furnace（SRV stoves）.
Embodiment 3：HIsmelt iron-bearing material double back rotary kiln the pre-heat treatment techniques
As shown in figure 3, after the mixing of 120t iron-bearing materials, 13.5t dolomites, first passes around 200 DEG C of drying rotary kilns and is dried,
Its mode heated can to remove the moisture in raw material, and be carried out just to raw material by high temperature rotary kiln tail gas heating
The preheating of step；After drying kiln drying, the iron-bearing material tentatively preheated is sieved, is removed thin in iron-bearing material after drying
Particle, iron-bearing material of the granularity more than 2 ~ 10 mm, which is added to by belt-conveying in high temperature rotary kiln, after screening is preheated；Through
After crossing high temperature rotary kiln processing, mixture temperature is more than 650 DEG C, and hot ore storage bin is sent by bucket elevator, passes through two or more
The hot mine injection system of item sprays into fusion reducing furnace（SRV stoves）.
Embodiment 4：HIsmelt iron-bearing material list preheating in rotary kiln treatment process
As shown in figure 4, after the mixing of 120t iron-bearing materials, 13.5t dolomites, the iron-bearing material tentatively preheated is sieved, is removed
The fine grained in iron-bearing material after drying is removed, iron-bearing material of the granularity more than 2 ~ 10 mm is added to by belt-conveying after screening
Preheated in rotary kiln, rotary kiln mainly provides heat by coal dust firing and SRV stock gases, kiln temperature section from
Kiln hood is to 200 ~ 1200 DEG C of kiln tail；After revolution rotary kiln processing, mixture temperature is more than 650 DEG C, passes through bucket elevator
It is sent into hot ore storage bin, fusion reducing furnace is sprayed by the hot mine injection system of two or more pieces（SRV stoves）.
Claims (10)
1. a kind of HIsmelt iron-bearing materials preheat pre-reduction treatment technique, which is characterized in that the technique is realized using rotary kiln
The preheating and prereduction of iron-bearing material make iron-bearing material reach certain reduction degree, while further heating makes iron-bearing material
Outlet temperature reach 650 DEG C or more, specifically comprise the following steps：
The first, iron-bearing material first with 0 ~ 10% flux after mixing, into drying rotary kiln dried, remove raw material in
Moisture, and preliminary preheating is carried out to raw material；
The second, after drying kiln drying, the iron-bearing material row tentatively preheated is sieved, thin after drying in iron-bearing material is removed
Grain；
Third, after sieving granularity are more than 2mm and are less than or equal to that 0 ~ 8% reduction coal dust or coke are added in the iron-bearing material of 10 mm
Powder, mixture, which is added to by belt-conveying in high temperature rotary kiln, carries out preheating and prereduction；
4th, after high temperature rotary kiln is handled, mixture is sent into hot ore storage bin by bucket elevator, passes through two or more pieces heat
Mine injection system sprays into fusion reducing furnace（SRV stoves）.
2. HIsmelt iron-bearing materials preheat pre-reduction treatment technique according to claim 1, which is characterized in that in step 1
Iron-bearing material refer to all be used for melting and reducing ferrous materials, can be red iron-bearing material, magnetic iron-bearing material, steel-smelting sewage sludge or
Person is iron-containing dust etc., and the granularity of these iron-bearing materials is 0 ~ 10 mm.
3. HIsmelt iron-bearing materials preheat pre-reduction treatment technique according to claim 1, which is characterized in that the step
In one flux refer to according to melting and reducing need it is to be added containing magnesium, contain calcium flux, can be dolomite, lime stone, quick lime etc.,
The granularity of these flux is 0 ~ 10 mm, with addition of 0 ~ 10% that ratio is iron-bearing material quality.
4. HIsmelt iron-bearing materials preheat pre-reduction treatment technique according to claim 1, which is characterized in that in step 1
The temperature range of drying kiln is 100 ~ 300 DEG C, and the mode of heating can be by high temperature rotary kiln tail gas heating or other works
Skill tail gas heating.
5. HIsmelt iron-bearing materials preheat pre-reduction treatment technique according to claim 1, which is characterized in that in step 1
Can be without drying kiln drying, and it is directly entered high-temperature pre-heat prereduction rotary kiln.
6. HIsmelt iron-bearing materials preheat pre-reduction treatment technique according to claim 1, which is characterized in that in step 2
It refers to the fine fraction iron-bearing material that granularity is less than 2mm to remove the fine grained after drying in iron-bearing material.
7. HIsmelt iron-bearing materials preheat pre-reduction treatment technique according to claim 1, which is characterized in that in step 3
The fuel of addition is mainly used for high temperature prereduction, can be with addition of coal dust or coke powder, and coal dust can be 0 ~ 6% with dosage, according to
The needs of actual production can adjust the proportioning of coal dust, can not also coal powder, the only temperature of simple raising mixture.
8. HIsmelt iron-bearing materials preheat pre-reduction treatment technique according to claim 1, which is characterized in that in step 3
High temperature rotary kiln temperature range be 700 ~ 1200 DEG C, the mode of heating can be by natural gas or other combustible gases of burning
Body, combusting coal fines or sprays into SRV producer gas simultaneously.
9. HIsmelt iron-bearing materials preheat pre-reduction treatment technique according to claim 1, which is characterized in that in step 3
In order to ensure the reproducibility atmosphere of high temperature rotary kiln, flue gas analysis device is disposed in the kiln hood of rotary kiln, ensures that CO contains in revolution
Amount is more than 20%, O2Content be less than 20%.
10. HIsmelt iron-bearing materials preheat pre-reduction treatment technique according to claim 1, which is characterized in that in step 4
Mixture is sent into hot ore storage bin library by bucket elevator, and mixture enters melting and reducing by the hot mine injection system of two or more pieces
Stove.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110592304A (en) * | 2019-08-29 | 2019-12-20 | 内蒙古赛思普科技有限公司 | Iron ore powder pretreatment process |
| CN110803526A (en) * | 2019-11-26 | 2020-02-18 | 内蒙古赛思普科技有限公司 | Feeding and conveying system and method for smelting reduction furnace |
| CN110983037A (en) * | 2019-12-20 | 2020-04-10 | 攀枝花钢城集团瑞通制冷设备有限公司 | Device for drying mineral powder raw material by utilizing pellet waste heat |
| CN111455121A (en) * | 2020-03-18 | 2020-07-28 | 内蒙古赛思普科技有限公司 | Method for producing high-purity cast pig iron by hydrogen-based smelting reduction |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110592304A (en) * | 2019-08-29 | 2019-12-20 | 内蒙古赛思普科技有限公司 | Iron ore powder pretreatment process |
| CN110803526A (en) * | 2019-11-26 | 2020-02-18 | 内蒙古赛思普科技有限公司 | Feeding and conveying system and method for smelting reduction furnace |
| CN110983037A (en) * | 2019-12-20 | 2020-04-10 | 攀枝花钢城集团瑞通制冷设备有限公司 | Device for drying mineral powder raw material by utilizing pellet waste heat |
| CN111455121A (en) * | 2020-03-18 | 2020-07-28 | 内蒙古赛思普科技有限公司 | Method for producing high-purity cast pig iron by hydrogen-based smelting reduction |
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