CN106480308B - A method of reducing sintering solid burnup - Google Patents
A method of reducing sintering solid burnup Download PDFInfo
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- CN106480308B CN106480308B CN201510548091.7A CN201510548091A CN106480308B CN 106480308 B CN106480308 B CN 106480308B CN 201510548091 A CN201510548091 A CN 201510548091A CN 106480308 B CN106480308 B CN 106480308B
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Abstract
The present invention discloses a kind of method for reducing sintering solid burnup, and in sintering production process, the used solid fuel coke of sintering production is carried out crushing and screening processing；It carries out after being crushed, it is respectively as follows:<0.5mm grade according to grade, 0.5mm~3mm grade,>3mm grade is sieved, and general<0.5mm grade, 0.5mm~3mm grade, the coke powder of>3mm grade is mixed in intensive mixer, after mixing<to account for the mass percent of coke powder total amount be the mass percent that 13%~18%, 0.5mm~3mm grade accounts for coke powder total amount to 0.5mm grade is 67%~71%, the mass percent that>3mm grade accounts for coke powder total amount is 12%~15%；Using ingredient, water is added to obtain sinter mixture through intensive mixer mixed pelletization, by sinter mixture on agglomerating plant cloth, sintering, obtain finished product sinter.
Description
Technical field
The invention belongs to sintered ore for iron-smelting production technical field, in particular to a kind of method for reducing sintering solid burnup.
Background technique
In iron and steel enterprise, sintering production has very important status.It on the one hand is because the quality of sinter is direct
Influence the quality of blast fumance；On the other hand, sintering plant is not only energy consumption rich and influential family, and its sinter quality produced will be straight
Connect the coke ratio for influencing blast furnace ironmaking.Iron ore powder sintering is a kind of iron mineral powder agglomeration method, be by particulate iron-bearing material and fuel,
Flux cooperates by a certain percentage, add water wetting, mix and sintering feed is made, be then distributed on sintering machine, by igniting, exhausting,
And high temperature is generated by fuel combustion in sintering feed, and then a series of physicochemical change, generating portion low-melting-point material occurs
Matter, and soften melting and generate a certain number of liquid phases, iron mineral wetting of particulates bonding is got up, formation has certain strong after cooling
Porous block product-sinter of degree.
It by sintering, can further improve the metallurgical performance of iron ore, provide better raw strip for reinforcing blast furnace smelting
Part.Iron Ore Powder passes through careful mixing before sintering, and ingredient is more evenly；Because solid fuel disappears in sintering, flux is decomposed, liquid phase
Condensation is shunk, and a large amount of hole is formed, and other component reactions in CaO, MgO and miberal powder that lime stone, dolomite provide generate
Be conducive to the mineralogical composition of reduction, slag making；The objectionable impurities such as sulphur, fluorine, arsenic can be removed partially, content reduction is allowed to, to make to burn
Tying mine has metallurgical performance more better than natural crystal.In this way, blast furnace can add less or raw flux is not added, makes furnace reduction, makes
Slag process is improved, also, it helps the stabilization of operating duty, creates conditions for high-quality, high yield, low consumption；
(3) by sintering for agglumeration, the ferric charge of the production divisions such as metallurgy, chemical industry generation, such as mine can effectively be recycled
Dirt, mill scale, steel slag, sulfate slag etc. not only take full advantage of resource, but also eliminate environmental pollution, can also reduce cost, increase
Economic benefit and social benefit.
The solid fuel consumption specific gravity that sintering process consumption accounts in iron and steel enterprise is maximum, reaches 75%~80%, it is seen then that
Reduce the consumption that energy consumption first has to reduce sintering solid fuel.How solid fuel is reduced, and the operation of sintering machine is horizontal
It is that on the one hand, the characteristic of raw material for sintering is one side, and the most important self-characteristic for also residing in solid fuel, many researchs
All show that fuel granularity is the principal element for influencing solid fuel consumption with practice, reasonable fuel granularity composition can be effective
Reduction fuel consumption, and can be improved the yield and quality of sinter, have the function that cost efficiency.It is upper general due to producing
It is required that ratio shared by solid fuel < 3mm particle size fraction cannot be less than 85% or 90%, but this is a kind of general concept, other
The coke powder of granularity can all influence the quality of final sinter in compounding, mixing, distributed process.Thus, it is necessary to fuel
In each granularity level carry out more in-depth study, to determine under existing material condition, which type of coke fines size point
Cloth is most suitable for the sintering production condition and Operating parameters of Anshan iron and steel plant.
During the sintering process, the combustion reaction of solid carbon be liquid phase generate and other reactions carry out provide necessary heat
Amount and atmospheric condition, have a significant impact to the quality of sinter.The burning of fuel particle belongs to gas-solid reaction, in this mistake
Cheng Zhong, oxygen molecule, which is adsorbed on solid fuel and shows to react with carbon, produces intermediate product, and intermediate product can be broken, shape
It at the reaction product of gas phase, enters back into air-flow, circulates.It, can by the reaction mechanism of carbon burnup in research sintering process
To obtain, the combustion process of fuel is controlled by gas diffusion, so the thickness of burning velocity and burning zone in mixture
It spends directly related with the diameter of fuel particle, the speed of air-flow, the gas permeability of the bed of material.In air velocity, the gas permeability of the bed of material is (i.e.
Material condition etc. is certain) when determining, sintering process is dependent on the size of fuel granularity.
In the production process of sinter, in sinter institute per ton heat dissipation energy, 80% solid fuel in mixture, section
About energy consumption, it is necessary to improve the utilization rate of solid fuel, improve distribution situation of the fuel in mixture, using suitable fuel pellet
Degree composition.Being sintered common solid fuel is coke cutting powder and anchracite duff, the productivity and sintering of the granularity of fuel for sintering
The quality of mine has great influence.
When granularity is excessive, following adverse effect will occur: (1) combustion zone broadens, so that permeability of sintering material bed be made to become
It is bad；(2) fuel is unevenly distributed in the bed of material.Near macro particles fuel, mine melts severe, and from fuel farther away ground square object
Material cannot be sintered well；(3) at no fuel, air is not used, and reduces sintering velocity；(4) to sintering board
When vehicle cloth, it is easy to happen fuel segregation phenomena, macro particles fuel concentrates on material layer lower part.But lower part usually requires that fuel quantity is wanted
Fewer than top, this makes the temperature difference of sinter bed become larger, and keeps the quality of sinter top and the bottom different, i.e. upper layer sinter is strong
It is poor to spend, and lower part sinter, which generates, superfuses and keep FeO content high.
Equally, it is also unfavorable that fuel granularity is too small: (1) fuel granularity is too small, and burning velocity is fast, conducts heat in sintering feed
When performance is bad, heat caused by fuel is difficult to that sintering feed is made to reach fusion temperature, and sintering feed bonding is bad, to make to be sintered
The decline of mine intensity；(2) small grain size fuel hinders air motion in the bed of material, reduces the gas permeability of sinter bed, and be possible to
It is entrained by the flow of air.
Technical solution
Technical problem to be solved by the invention is to provide a kind of methods for reducing sintering solid burnup, are sintered by optimization
The granularmetric composition of process fuel-in-use-coke powder reduces sintering solid fuel consumption, improves sintering process index, improves sintering
Mine drum strength improves sintering usage factor and sinter yield rate, improves the yield and quality of sintering production, provide for blast fumance
Achieve the purpose that cost efficiency while High-quality Sinters.
To solve the above problems, the technical solution of the present invention is as follows:
A method of it reducing sintering solid burnup and sintering production is used solid fuel in sintering production process
Coke carries out crushing and screening processing；It carries out after being crushed, is respectively as follows:<0.5mm grade, 0.5mm~3mm grade,>3mm according to grade
Grade is sieved, and general<0.5mm grade, 0.5mm~3mm grade, and the coke powder of>3mm grade is mixed in intensive mixer
It is even, after mixing < to account for the mass percent of coke powder total amount be that 13%~18%, 0.5mm~3mm grade accounts for coke powder is total to 0.5mm grade
The mass percent of amount is 67%~71%, and the mass percent that > 3mm grade accounts for coke powder total amount is 12%~15%；Using
Ingredient adds water to obtain sinter mixture through intensive mixer mixed pelletization, by sinter mixture on agglomerating plant cloth, burn
Knot, obtains finished product sinter.
Beneficial effects of the present invention:
1, the present invention provides a kind of method for reducing sintering solid burnup, and by optimizing the granularmetric composition of coke powder, sintering is solid
Fluid fuel consumption reduces by 2.43~2.68kg/t, and it is significant to reduce sintering cost.
2, the present invention can make sintered ore rotary drum strength improve 3.7~3.9 percentage points, and sintering usage factor improves
0.216~0.232t/ (m2.h), sinter yield rate improves 4.8~5.3 percentage points, and the yield and quality of sintering production obviously mentions
Height, Metallurgical Properties of Sinter improve, sinter cryogenic reducting powder index RDI+3.15mm1.98~2.68 percentage points are improved,
Achieve the purpose that provide high-quality feed stock for blast furnace for blast fumance while reducing sintering solid burnup.
Specific embodiment
Embodiment 1:
Solid fuel used in sintering production-coke is subjected to break process, is respectively < 0.5mm according to granularity,
Tri- grades of 0.5mm~3mm, > 3mm are sieved.By the coke powder of<0.5mm grade, 0.5~3mm grade,>3mm grade according to
Mass percent is respectively 18%, 67%, 15% progress strength mixing.By ingredient, add water through intensive mixer mixed pelletization
Obtain sinter mixture, by sinter mixture on agglomerating plant cloth, sintering, obtain finished product sinter.Test result shows: with
It is not compared using original production process of the invention, sintering usage factor improves 0.216t/ (m2.h), sinter yield rate improves
4.8 percentage points, drum strength improves 3.7 percentage points, and solid burnup reduces 2.43kg/t, and sinter low temperature reduction degradation refers to
Number RDI+3.15mm1.98 percentage points are improved, sinter quality improves obviously, and solid burnup reduces significant.
Embodiment 2:
Solid fuel used in sintering production-coke is subjected to break process, is respectively < 0.5mm according to granularity,
Tri- grades of 0.5mm~3mm, > 3mm are sieved.By the coke powder of<0.5mm grade, 0.5~3mm grade,>3mm grade according to
Mass percent is respectively 14%, 71%, 15% progress strength mixing.By ingredient, add water through intensive mixer mixed pelletization
Obtain sinter mixture, by sinter mixture on agglomerating plant cloth, sintering, obtain finished product sinter.Test result shows: with
It is not compared using original production process of the invention, sintering usage factor improves 0.226t/ (m2.h), sinter yield rate improves
5.0 percentage points, drum strength improves 3.7 percentage points, and solid burnup reduces 2.51kg/t, and sinter low temperature reduction degradation refers to
Number RDI+3.15mm2.31 percentage points are improved, sinter quality improves obviously, and solid burnup reduces significant.
Embodiment 3:
Solid fuel used in sintering production-coke is subjected to break process, is respectively < 0.5mm according to granularity,
Tri- grades of 0.5mm~3mm, > 3mm are sieved.By the coke powder of<0.5mm grade, 0.5~3mm grade,>3mm grade according to
Mass percent is respectively 15.14%, 70%, 14.86% progress strength mixing.By ingredient, add water mixed through intensive mixer
Even granulation obtains sinter mixture, by sinter mixture on agglomerating plant cloth, sintering, obtain finished product sinter.Test result
Show: compared with not using original production process of the invention, sintering usage factor improves 0.232t/ (m2.h), sinter finished product
Rate improves 5.3 percentage points, and drum strength improves 3.9 percentage points, and solid burnup reduces 2.68kg/t, sinter low-temperature reduction
Dusting index RDI+3.15mm2.68 percentage points are improved, sinter quality improves obviously, and solid burnup reduces significant.Each coke powder grain
Grade is respectively sintered index under the conditions of mixture ratios of embodiment 3, in implementation result and reaches best.
Comparative example:
Add without solid fuel-coke used in the sintering production of any processing as fuel by ingredient
Water obtains sinter mixture through intensive mixer mixed pelletization, by sinter mixture on agglomerating plant cloth, sintering, obtain finished product
Sinter.
1 comparison of test results of table
Claims (1)
1. a kind of method for reducing sintering solid burnup, it is characterised in that in sintering production process, sintering production is used
Solid fuel coke carries out crushing and screening processing；It carries out after being crushed, is respectively as follows: < 0.5mm grade, 0.5mm~3mm according to grade
Grade,>3mm grade is sieved, and general<0.5mm grade, 0.5mm~3mm grade, and the coke powder of>3mm grade is mixed in strength
Mixed in machine, after mixing < 0.5mm grade account for coke powder total amount mass percent be 13%~18%, 0.5mm~3mm
Grade account for coke powder total amount mass percent be 67%~71%, > 3mm grade account for coke powder total amount mass percent be 12%~
15%；Using ingredient, water is added to obtain sinter mixture through intensive mixer mixed pelletization, by sinter mixture in agglomerating plant
Upper cloth, sintering obtain finished product sinter.
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| CN201510548091.7A CN106480308B (en) | 2015-08-31 | 2015-08-31 | A method of reducing sintering solid burnup |
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| CN110273066B (en) * | 2018-03-15 | 2020-12-04 | 中冶长天国际工程有限责任公司 | Method and device for judging effectiveness of sintered fuel sample based on particle size |
| CN111100983B (en) * | 2020-01-11 | 2022-03-18 | 武钢集团昆明钢铁股份有限公司 | Low-carbon, environment-friendly and efficient sintering method for fractional addition of sintering fuel |
| CN113621793B (en) * | 2021-08-12 | 2022-12-23 | 马鞍山钢铁股份有限公司 | Sintered solid fuel size fraction control method |
| CN114350936A (en) * | 2021-12-15 | 2022-04-15 | 包头钢铁（集团）有限责任公司 | Method for reducing sintering solid fuel consumption by controlling fuel granularity |
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| CN101532084B (en) * | 2009-04-23 | 2011-06-29 | 攀钢集团钢铁钒钛股份有限公司 | Method for charging iron ore sintering fuel |
| JP5699567B2 (en) * | 2010-11-29 | 2015-04-15 | Ｊｆｅスチール株式会社 | Method for producing sintered ore |
| CN103215442B (en) * | 2013-04-27 | 2014-07-02 | 河北钢铁股份有限公司邯郸分公司 | Thick-bed sintering feed surface-spraying covering agent and spraying method thereof |
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