CN107641709A - A kind of sintering method for reducing burnup - Google Patents
A kind of sintering method for reducing burnup Download PDFInfo
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- CN107641709A CN107641709A CN201710916639.8A CN201710916639A CN107641709A CN 107641709 A CN107641709 A CN 107641709A CN 201710916639 A CN201710916639 A CN 201710916639A CN 107641709 A CN107641709 A CN 107641709A
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Abstract
The invention discloses a kind of sintering method for reducing burnup, Iron Ore Powder, fuel, the composite fluxing agent containing quick lime and bentonite are mixed to form sintering feed, pelletizing, form sintering feed, grate-layer material is layered on sintering machine, then sintering feed is uniformly layered on grate-layer material, sintering feed thickness is 750 800mm, rearmost point burns knot, and firing temperature is 1,100 1200 DEG C；The mass percent of the sintering feed each component is：Fuel 3% 6%, the composite fluxing agent containing quick lime 12% 15%, bentonite 3% 5%, surplus are Iron Ore Powder；Composite fluxing agent containing quick lime is the mixture of quick lime, lime stone, dolomite, light dolomite and serpentine.Technical solution of the present invention effectively reduces burnup, improves productivity effect on the basis of sinter quality is ensured.
Description
Technical field
The present invention relates to sintering art, specially a kind of sintering method for reducing burnup.
Background technology
Sintering production is an important step of steel manufacture process, is to ensure the basic bar that blast furnace ironmaking normally produces
Part.The product quality, yield and reduction energy consumption, cost of sintering deposit are improved, is the target that enterprise is pursued.Iron ore powder sintering is one
The specialism of technical sophistication, it is largest agglomeration operation.Its material handling capacity is only second to ironmaking production, accounts for steel connection
Close the second of enterprise；Energy resource consumption is only second to ironmaking and steel rolling occupies the 3rd, it has also become important in modern steel industry
Production process.
In recent years, China's pig iron cost is in downward trend year by year, but compared with overseas enterprise, ton iron cost is still higher.
Reason is many, except having outside the Pass with status of equipment, operation level etc., largely with burden structure and Under Different Concentrate Supplementing Level
It is relevant (in terms of quality), therefore a kind of low burn consumption is found, while and can meets that the sintering of furnace charge requirement with when method, just turns into drop
The important channel of low production cost.
The content of the invention
The present invention provides one kind on the basis of furnace charge performance is met, can reduce the sintering method of burnup, use the party
Method can effectively reduce burnup, reduce production cost, improve productivity effect.
To solve above technical problem, the present invention provides a kind of sintering method for reducing burnup, it is characterised in that by iron ore
Powder, fuel, the composite fluxing agent containing quick lime and bentonite are mixed to form sintering feed, pelletizing, sintering feed are formed, by grate-layer material
It is layered on sintering machine, then sintering feed is uniformly layered on grate-layer material, the sintering feed thickness is 750-800mm, is finally lighted a fire
Sintering, firing temperature are 1100-1200 DEG C；The mass percent of the sintering feed each component is：Fuel 3%-6%, the stone containing life
The composite fluxing agent 12%-15% of ash, bentonite 3%-5%, surplus are Iron Ore Powder；The light dolomite, serpentine and dolomite
Mass ratio be dolomite：Light dolomite：Serpentine=1： 0.65-0.70:0.03-0.04.
Preferably, the mass percent of the sintering feed each component is：Fuel 5%, the composite fluxing agent 15% containing quick lime,
Bentonite 4%, surplus are Iron Ore Powder.
Preferably, the fuel is coke powder, coke powder phosphorus content >=80%, volatile matter≤10%, ash content≤10%, S
≤ 5%.
Preferably, the mass percent that the carbonaceousfuel component in the coke powder accounts for total sintering feed is 4-5%.
Preferably, the composite fluxing agent containing quick lime is quick lime, lime stone, dolomite, light dolomite and snake
The mixture of line stone.
Preferably, the mass ratio of the quick lime, lime stone, dolomite, serpentine and light dolomite is quick lime：Stone
Lime stone：Dolomite：Light dolomite：Serpentine=(1.03-1.05)：(1.02-1.03):(1.00-1.01)： (0.65-
0.70):(0.03-0.04)。
Preferably, the mass ratio of the quick lime, lime stone, dolomite, serpentine and light dolomite is quick lime：Stone
Lime stone：Dolomite：Light dolomite：Serpentine=1.05：1.02:1.00：0.68:0.03.
Preferably, quick lime, the quality requirement of lime stone are CaO >=70% in the composite fluxing agent containing quick lime,
Preferably, MgO, SiO in the composite fluxing agent containing quick lime2The mass percent that content accounts for total sintering feed is point
Other 1.5%-2.5%, 4.5-5.5%.
Preferably, granularity≤2mm of the composite fluxing agent containing quick lime.
The main component of quick lime is CaO, and the main component of calcium hydroxide is Ca (OH)2, the main component of lime stone is
CaCO3, the main component of dolomite is CaMg (CO3)2, a certain amount of dolomite is added in sintering feed, contains sintering deposit suitable
When MgO, play the role of to sintering process good, the quality of sintering deposit can be improved.Light dolomite is then dolomite through forging
It is made after burning decarburization, and particle is uniformly tiny, is advantageous to the generation of liquid phase in sintering process and is uniformly distributed, light dolomite
When dosage is not high, 3 factors can improve sintering deposit cold-performance below：1) light dolomite granularity is smaller, during batch mixing
It is evenly distributed, the distribution of liquid phase is also more uniform in sintering process；2) there is free CaO in light dolomite, its activity is strong,
Be advantageous to the formation of calcium ferrite early stage；3) light dolomite absorbs heat without carbonate decomposition, and the utilization power of energy is more preferable, beneficial to liquid
The increase of phasor.Serpentine is a kind of high SiO2, high MgO material, add in sintering feed, add and other arteries and veins after finely ground
The reactivity of stone, increase liquid phase and particle is easy to cohesive, thus sinter strength improves.
Bentonite is by the refined inorganic mineral gel formed of natural montmorillonite.Bentonite is generally referred to mainly by montmorillonite group
Into a kind of claystone.The principle active component of bentonite is montmorillonite, and content about 90%, its molecular weight is about 720,
Wherein often containing mineral such as quartz, feldspar, dolomite, calcites.Bentonite is added in sintering process, and by quality control certain
In the range of, the basicity of sintering feed can be effectively improved, the Technological Economies such as sinter strength, grade, yield and smelting performance are referred to
Target has wholesome effect.
In summary, technical solution of the present invention includes the composition and proportioning of fuel, adopted by improving sintering feed items component
With containing multi-component composite fluxing agent, and bentonite is with the addition of, on the basis of sinter quality is ensured, effectively reduces burnup,
Improve productivity effect.
Embodiment
In order that those skilled in the art more fully understands the technical scheme of invention, with reference to embodiment pair
The present invention is described in further detail.
So-called sintering, it is by the iron-bearing material of powdery, quantitative flux and fuel, mixing of fetching water is incorporated by production requirement
Compound is wired on pallet by distributing device after granulation, carries out igniting sintering afterwards；Because fuel combustion produces necessarily
Heat and the bed of material auto accumulation heat effect under, a series of physical reactions occur between compound, a part of compound passes through
Contact generation solid phase reaction generation is low scrupulously and respectfully to put material, and soft lattice occur at high temperature for these materials, generate a certain amount of liquid phase, liquid phase
Material soaks other not molten iron ores particles by flowing；With the progress of exhausting, temperature bonds with reduction, liquid phase substance
Mutually mineral powder granular is bonded blocking together.This process is referred to as sintering, and obtained lump ore is called sintering deposit.
The effect of sintering production is mainly reflected at 2 points：1) blast furnace is in ironmaking processes, in order to ensure the direct motion of blast furnace, stove
Material component requirements have the granularity hooked, a small amount of powder, higher mechanical strength (hot and cold intensity.If furnace charge has higher
Ferrous grade, less objectionable impurities, and blast furnace coke ratio can be effectively reduced when there is good metallurgical performance.Using burning
Agglomeration method is tied, can almost reach above-mentioned whole requirements.Most of China is all lean ore, and it can be obtained after ore dressing
Some fine concentrates, and natural rich ore can produce some fine ores during exploitation and broken whole grain, and these ferric charges are all
The block material for meeting blast fumance requirement by sintering into is needed to enter blast furnace.Carbonate containing (such as siderite) and the crystallization water
(such as limonite) more ore, it can be enriched with iron by sintering process removal volatile matter after broken.Some ores are also
It is frangible during original, pass through the iron-containing charge that can become that there is good reproducibility and high thermal stability after sintering process.Institute
Various resources can be made full use of with sintering process, expand the ferric charge species of blast furnace.2) sintering production can be by some works
Caused iron filings are useless in byproduct such as stove dirt, sulfate slag, slag, newborn sheetmetal, metallurgy and chemical industry process in industry production
Material is rational to be utilized.Ferric charge can obtain block, porous, good reproducibility and the uniform and stable sintering of composition by sintering process
Ore deposit；Some objectionable impurities that iron ore contains, such as sulphur, potassium, fluorine, lead, sodium, bell, arsenic, major part can in sintering production
It is removed or recycles.Sintering process can also produce the sintering deposit with certain basicity simultaneously, while with addition of acid pellet
Ore deposit, this makes it possible to make blast furnace add less in smelting process or be not added with lime stone, reduce lime stone and absorption is decomposed in blast furnace
Certain heat, and powder caused by its decomposition influence the gas permeability of blast furnace, so as to be advantageous to smooth operation of furnace and reduce high
The coke ratio of stove.
Technical solution of the present invention is started with from the dispensing and implementation of sintering, includes the composition and proportioning of fuel, using containing
Multi-component composite fluxing agent, and bentonite is with the addition of, on the basis of sinter quality is ensured, burnup is effectively reduced, is improved
Productivity effect effectively reduces burnup, improves productivity effect on the basis of ensure sinter quality.
Above-mentioned is that the present invention is elaborated, and is embodiments of the invention below.
The invention provides a kind of sintering method for effectively improving desulfuration efficiency, by Iron Ore Powder, coke powder and contains raw stone
Ash, lime stone, dolomite, light dolomite and serpentine mixture composite fluxing agent and bentonite mix according to a certain ratio
Close, add suitable quantity of water, by drum polletizing pelletizing, form sintering feed, it is 10-25mm, thickness 20-25mm first to spread one layer of granularity
Fritter sintering deposit as grate-layer material, grate-layer material is layered on sintering machine, then sintering feed is uniformly layered on grate-layer material, cloth
Direction is uniformly distributed in length and breadth along chassis for granularity and chemical composition of Shi Yaoqiu sintering feeds etc., and has certain laxity, surface
It is smooth.The sintering feed thickness is 750-800mm, and rearmost point burns knot, and firing temperature is 1100-1200 DEG C.
The mass percent of wherein sintering feed each component is：Fuel 3%-6%, the composite fluxing agent 12%- containing quick lime
15%th, bentonite 3%-5%, surplus are Iron Ore Powder.Preferably, the mass percent of sintering feed each component is：Fuel 5%, containing life
The composite fluxing agent 15% of lime, bentonite 4%, surplus are Iron Ore Powder.
Wherein, the mass ratio of quick lime, lime stone, dolomite, serpentine and light dolomite is quick lime：Lime stone：
Dolomite：Light dolomite：Serpentine=(1.03-1.05)：(1.02-1.03):(1.00-1.01)：(0.65-0.70):
(0.03-0.04).Preferably, the mass ratio of quick lime, lime stone, dolomite, serpentine and light dolomite is quick lime：Stone
Lime stone：Dolomite：Light dolomite：Serpentine=1.05：1.02:1.00：0.68:0.03.
Wherein, coke powder phosphorus content >=80%, volatile matter≤10%, ash content≤10%, S≤5%.Carbonaceousfuel component in coke powder
The mass percent for accounting for sintering feed is 4-5%
In flux, quick lime, the quality requirement of lime stone are CaO >=70% in the composite fluxing agent containing quick lime,
MgO in composite fluxing agent, SiO2The mass percent that content accounts for sintering feed is 1.5%-2.5%, 4.5-5.5% respectively.It is and multiple
Close granularity≤2mm of flux.
Embodiment one
A kind of sintering method for reducing sintering burnup, including four dispensing, pelletizing, stone, sintering steps；
(1) dispensing：Raw material is the sefstromite powder that granularity is 2~10mm, and wherein granularity is 2~5mm sefstromite powder
Weight be total Iron Ore Powder weight 75%；
Fuel is coke powder, coke powder phosphorus content >=80%, volatile matter≤10%, ash content≤10%, S≤5%.Carbon in coke powder
The mass percent that matter composition accounts for sintering feed is 4-5%
Flux is the compound molten of the mixture containing quick lime, lime stone, dolomite, light dolomite and serpentine
Agent, in flux, quick lime, the quality requirement of lime stone are CaO >=70% in the composite fluxing agent containing quick lime, compound molten
MgO in agent, SiO2The mass percent that content accounts for sintering feed is 1.5%-2.5%, 4.5-5.5% respectively.And composite fluxing agent
Granularity≤2mm.
Fuel 3%, the composite fluxing agent 15% containing quick lime, bentonite 3-5%, surplus are sefstromite powder.
Quick lime, lime stone, dolomite, the mass ratio of serpentine and light dolomite are quick lime：Lime stone：White clouds
Stone：Light dolomite：Serpentine=1.05：1.02:1.00：0.68:0.03.
(2) mixed pelletizing：Sintering feed is added into water, is then well mixed, incorporation time 2-5min, in drum pelletizer
Middle carry out pelletizing.
(3) stone：Before cloth compound, it is 10~25mm first to spread one layer of granularity, and thickness is 20mm fritter sintering deposit
As grate-layer material, the purpose is to protect fire grate, load of dust remove is reduced, extends the fan rotor life-span, reduces or eliminates fire grate sizing.
After having spread bed material, cloth is carried out therewith.Require that direction is uniform in length and breadth along chassis for granularity and chemical composition of compound etc. during cloth
Distribution, and have certain laxity, surfacing.Then sintering feed is equably layered on bed material, layer thickness is
780mm。
(4) igniting sintering：Bed of material surface is lighted, firing temperature is 1200 DEG C, duration of ignition 60s, and igniting is true
Reciprocal of duty cycle 6kPa, igniting depth are 15mm, are then sintered.
Packet, different by bentonite content, by embodiment one dividing into three group, a groups are bentonite content 3%, b group bentonite contents
4%, c group are bentonite content 5%.Evaluated with burnup and productivity effect, its result such as table 1.
The evaluation result of the different bentonite contents of table 1
| Packet | Burnup | Benefit |
| a | 49.5kg/t | 15.87 ten thousand/moon |
| b | 47.4kg/t | 17.55 ten thousand/moon |
| c | 48.3kg/t | 16.34 ten thousand/moon |
Embodiment two
A kind of sintering method for reducing sintering burnup, including four dispensing, pelletizing, stone, sintering steps；
(1) dispensing：Raw material is the sefstromite powder that granularity is 2~10mm, and wherein granularity is 2~5mm sefstromite powder
Weight be total Iron Ore Powder weight 75%；
Fuel is coke powder, coke powder phosphorus content >=80%, volatile matter≤10%, ash content≤10%, S≤5%.Carbon in coke powder
The mass percent that matter composition accounts for sintering feed is 4.5%
Flux is the compound molten of the mixture containing quick lime, lime stone, dolomite, light dolomite and serpentine
Agent, in flux, quick lime, the quality requirement of lime stone are CaO >=70% in the composite fluxing agent containing quick lime, compound molten
MgO in agent, SiO2The mass percent that content accounts for sintering feed is 1.5%-2.5%, 4.5-5.5% respectively.And composite fluxing agent
Granularity≤2mm.
Fuel 6%, the composite fluxing agent 12-15% containing quick lime, bentonite 4%, surplus are sefstromite powder.
Quick lime, lime stone, dolomite, the mass ratio of serpentine and light dolomite are quick lime：Lime stone：White clouds
Stone：Light dolomite：Serpentine=1.05：1.02:1.00：0.68:0.03.
(2) mixed pelletizing：Sintering feed is added into water, is then well mixed, incorporation time 2-5min, in drum pelletizer
Middle carry out pelletizing.
(3) stone：Before cloth compound, it is 10~25mm first to spread one layer of granularity, and thickness is 20mm fritter sintering deposit
As grate-layer material, the purpose is to protect fire grate, load of dust remove is reduced, extends the fan rotor life-span, reduces or eliminates fire grate sizing.
After having spread bed material, cloth is carried out therewith.Require that direction is uniform in length and breadth along chassis for granularity and chemical composition of compound etc. during cloth
Distribution, and have certain laxity, surfacing.Then sintering feed is equably layered on bed material, layer thickness is
750mm。
(4) igniting sintering：Bed of material surface is lighted, firing temperature is 1100 DEG C, duration of ignition 60s, and igniting is true
Reciprocal of duty cycle 6kPa, igniting depth are 15mm, are then sintered.
Packet, it is different with composite fluxing agent content, it is divided into four groups, e group composite fluxing agents content is that 12%, f group composite fluxing agents contain
It is that 14%, h group composite fluxing agents content is 15% to measure as 13%, g group composite fluxing agents content, is evaluated with burnup and productivity effect, its
As a result such as table 2.
The evaluation result of the different composite flux content of table 2
| Packet | Burnup | Benefit |
| e | 49.5kg/t | 15.87 ten thousand/moon |
| f | 49.0kg/t | 15.95 ten thousand/moon |
| g | 48.6kg/t | 16.5 ten thousand/moon |
| h | 48.2kg/t | 16.9 ten thousand/moon |
Embodiment three
A kind of sintering method for reducing sintering burnup, including four dispensing, pelletizing, stone, sintering steps；
(1) dispensing：Raw material is the sefstromite powder that granularity is 2~10mm, and wherein granularity is 2~5mm sefstromite powder
Weight be total Iron Ore Powder weight 75%；
Fuel is coke powder, coke powder phosphorus content >=80%, volatile matter≤10%, ash content≤10%, S≤5%.Carbon in coke powder
The mass percent that matter composition accounts for sintering feed is 4.5%
Flux is the compound molten of the mixture containing quick lime, lime stone, dolomite, light dolomite and serpentine
Agent, in flux, quick lime, the quality requirement of lime stone are CaO >=70% in the composite fluxing agent containing quick lime, compound molten
MgO in agent, SiO2The mass percent that content accounts for sintering feed is 1.5%-2.5%, 4.5-5.5% respectively.And composite fluxing agent
Granularity≤2mm.
Fuel 5%, the composite fluxing agent 15% containing quick lime, bentonite 4%, surplus are sefstromite powder.
Quick lime, lime stone, dolomite, the mass ratio of serpentine and light dolomite are quick lime：Lime stone：White clouds
Stone：Light dolomite：Serpentine=(1.03-1.05)：(1.02-1.03):(1.00-1.01)：(0.65-0.70): (0.03-
0.04)。
(2) mixed pelletizing：Sintering feed is added into water, is then well mixed, incorporation time 2-5min, in drum pelletizer
Middle carry out pelletizing.
(3) stone：Before cloth compound, it is 10~25mm first to spread one layer of granularity, and thickness is 20mm fritter sintering deposit
As grate-layer material, the purpose is to protect fire grate, load of dust remove is reduced, extends the fan rotor life-span, reduces or eliminates fire grate sizing.
After having spread bed material, cloth is carried out therewith.Require that direction is uniform in length and breadth along chassis for granularity and chemical composition of compound etc. during cloth
Distribution, and have certain laxity, surfacing.Then sintering feed is equably layered on bed material, layer thickness is
800mm。
(4) igniting sintering：Bed of material surface is lighted, firing temperature is 1200 DEG C, duration of ignition 60s, and igniting is true
Reciprocal of duty cycle 6kPa, igniting depth are 15mm, are then sintered.
Packet, difference is matched by composite fluxing agent, is divided into i, j, k, l group：
I groups：Quick lime：Lime stone：Dolomite：Light dolomite：Serpentine=1.05:1.02:1.00：0.68:0.03；
J groups：Quick lime：Lime stone：Dolomite：Light dolomite：Serpentine=1.03:1.03：1.01:0.65:0.04；
K groups：Quick lime：Lime stone：Dolomite：Light dolomite：Serpentine=1.04:1.03：1.01:0.70:0.03；
L groups：Quick lime：Lime stone：Dolomite：Light dolomite：Serpentine=1.05:1.03：1.00:0.70:0.04；
With burnup and benefit evaluation, its result such as table 3.
The evaluation result of the composite fluxing agent different ratio of table 3
| Packet | Burnup | Benefit |
| g | 47.5kg/t | 17.87 ten thousand/moon |
| h | 48.4kg/t | 16.55 ten thousand/moon |
| i | 48.3kg/t | 16.41 ten thousand/moon |
| l | 48.0kg/t | 17.03 ten thousand/moon |
It the above is only the preferred embodiment of the present invention, it is noted that above-mentioned preferred embodiment is not construed as pair
The limitation of the present invention, protection scope of the present invention should be defined by claim limited range.For the art
For those of ordinary skill, without departing from the spirit and scope of the present invention, some improvements and modifications can also be made, these change
Enter and retouch and also should be regarded as protection scope of the present invention.
Claims (9)
1. a kind of sintering method for reducing burnup, it is characterised in that by Iron Ore Powder, fuel, composite fluxing agent and soap containing quick lime
Soil is mixed to form sintering feed, pelletizing, forms sintering feed, grate-layer material is layered on sintering machine, then sintering feed is uniformly layered on
On grate-layer material, the sintering feed thickness is 750-800mm, and rearmost point burns knot, and firing temperature is 1100-1200 DEG C；It is described
The mass percent of sintering feed each component is：Fuel 3%-6%, the composite fluxing agent 12%-15% containing quick lime, bentonite 3%-
5%th, surplus is Iron Ore Powder；The composite fluxing agent containing quick lime be quick lime, lime stone, dolomite, light dolomite and
The mixture of serpentine.
2. sintering method according to claim 1, it is characterised in that the mass percent of the sintering feed each component is：
Fuel 5%, the composite fluxing agent 15% containing quick lime, bentonite 4%, surplus are Iron Ore Powder.
3. sintering method according to claim 1, it is characterised in that the fuel is coke powder, the coke powder phosphorus content >=
80%, volatile matter≤10%, ash content≤10%, S≤5%.
4. sintering method according to claim 3, it is characterised in that the carbonaceousfuel component in the coke powder accounts for total sintering feed
Mass percent is 4-5%.
5. sintering method according to claim 1, it is characterised in that the quick lime, lime stone, dolomite, serpentine
Mass ratio with light dolomite is quick lime：Lime stone：Dolomite：Light dolomite：Serpentine=(1.03-1.05)：
(1.02-1.03):(1.00-1.01)：(0.65-0.70):(0.03-0.04).
6. sintering method according to claim 5, it is characterised in that the quick lime, lime stone, dolomite, serpentine
Mass ratio with light dolomite is quick lime：Lime stone：Dolomite：Light dolomite：Serpentine=1.05：1.02:1.00：
0.68:0.03。
7. sintering method according to claim 1, it is characterised in that quick lime in the composite fluxing agent containing quick lime,
The quality requirement of lime stone is CaO >=70%.
8. sintering method according to claim 1, it is characterised in that MgO, SiO in the composite fluxing agent containing quick lime2
The mass percent that content accounts for total sintering feed is 1.5%-2.5%, 4.5-5.5% respectively.
9. sintering method according to claim 8, it is characterised in that the granularity of the composite fluxing agent containing quick lime≤
2mm。
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112342373A (en) * | 2020-09-22 | 2021-02-09 | 包头钢铁（集团）有限责任公司 | High-quality low-silicon-content sinter prepared from low-silicon iron concentrate containing fluorine, potassium and sodium and preparation method thereof |
| CN114622088A (en) * | 2022-02-28 | 2022-06-14 | 包头钢铁（集团）有限责任公司 | Method for controlling particle size of limestone for producing sintered ore by adding high-proportion potassium, sodium and fluorine iron concentrate |
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| CN105331805A (en) * | 2015-09-24 | 2016-02-17 | 中南大学 | Method for manufacturing high-iron manganese ore composite sintering ores |
| CN106244799A (en) * | 2016-08-31 | 2016-12-21 | 云南德胜钢铁有限公司 | A kind of sintering method improving sintering desulfuration rate |
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| CN112342373A (en) * | 2020-09-22 | 2021-02-09 | 包头钢铁（集团）有限责任公司 | High-quality low-silicon-content sinter prepared from low-silicon iron concentrate containing fluorine, potassium and sodium and preparation method thereof |
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