CN109055731A - A kind of dust granulating process and agglomeration for iron mine technique - Google Patents
A kind of dust granulating process and agglomeration for iron mine technique Download PDFInfo
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- CN109055731A CN109055731A CN201811156211.9A CN201811156211A CN109055731A CN 109055731 A CN109055731 A CN 109055731A CN 201811156211 A CN201811156211 A CN 201811156211A CN 109055731 A CN109055731 A CN 109055731A
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- dust
- grinding
- ingredient
- mix
- sintering
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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
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
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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
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/16—Sintering; Agglomerating
-
- 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
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/242—Binding; Briquetting ; Granulating with binders
- C22B1/243—Binding; Briquetting ; Granulating with binders inorganic
Abstract
A kind of dust granulating process, the technique is the following steps are included: 1) ingredient: the various dust that blast furnace and/or sintering process generate being carried out ingredient, alkalinity regulator is added in ingredient, obtains dust ingredient；2) grinding: the dust ingredient after addition alkalinity regulator is subjected to grinding, the dust ingredient after obtaining grinding；3) it mixes: the dust ingredient after grinding being mixed, mix dust material is obtained；4) binder, profit mill, the mix dust material after obtaining profit mill mix grinding: are added in mix dust material；5) pelletizing: the mix dust material after profit mill is subjected to pelletizing, obtains dust green-ball.The present invention also provides a kind of agglomeration for iron mine techniques, and dust green-ball obtained is added in the blending ore obtained after sinter mixture two mixes, is sintered together into sintering machine.Using technique of the invention, the gas permeability of sinter bed can effectively improve, improve Sintering Operation Index, while avoiding the wasting of resources, reduce environmental pollution.
Description
Technical field
The present invention relates to steel works sintering fields, and in particular to a kind of dust granulating process and agglomeration for iron mine technique, mainly
Solve the dust that blast furnace and sintering process generate in steel plant cause environmental pollution, the wasting of resources and existing dust utilization rate it is low,
The problem of utilizing status difference.
Background technique
The Main way of steel industry development is the high-efficiency comprehensive utilization of environmental-friendly, green ecological and resource.In steel
It is maximum to generate the dust proportion that a large amount of dust, especially sintering process generate for blast furnace and sintering process in ironworks.However it produces
These raw dust often result in the environmental pollution of production area, if arbitrarily abandoned, not only cause external environmental, simultaneously
Also cause the wasting of resources.
Currently, domestic steel plant are relatively simple for the processing mode of this dust, the dust and blast furnace that sintering process generates
Primary ash can be used as the ingredient of raw materials for sintering, remaining dust is discarded substantially.Existing specific Land use systems are height
The primary ash of furnace and the internal dust-removing powder of sintering are incorporated Sinter Blending Process, participate in ingredient, blast furnace discharge yard ash and raw material ash directly humidification
Laggard two is mixed；Generally speaking, the blast furnace and the internal dust of sintering recycled by sintering process is all without by corresponding pre-
Processing and processing, the position being only added difference.And the miscellaneous miberal powder that other dust such as feedstock processing process generates, refining
The various dust that burnt, blast furnace ironmaking process generates, bof sludge, steel slag and the mud cake that steelmaking process generates, rolling process generate
Iron scale, the activated sludge, etc. that chemical company generates.These dust are discarded substantially, these dust and byproduct, are led to
Often all containing beneficiating ingredients such as higher Fe, CaO, MgO and fixed carbon, the substitute that can be used as sintering crude fuel is used,
Limited resource is not only wasted if discarded, but also polluted environment.In addition, if these dust are directly added into raw materials for sintering
In mixed, since such dust is compared to new raw materials for sintering, has a certain difference, be directly added into then in aspect of performance
It will affect the quality of sinter.
For the prior art processing mode of dust processing, there are larger problems.In view of blast furnace and it is sintered internal powder
Grit degree is thinner, and especially blast furnace dust (including one, two ash of blast furnace, cast house ash and raw material ash) granularity is superfine, wherein <
The part 0.125mm up to 60.5% or more, only 0.2mm will if simple be directly incorporated in raw material for sintering for average particle size
It is brought a negative impact to productivity of sinter index.In addition, blast furnace and sintering dust occurrence quantity and ingredient with production variation and use
The change of material structure can also change, and certain influence can be brought to sintering production stability.
Therefore up to the present, the practical efficiency for the dust that blast furnace is generated with sintering is lower, not only wastes limited
Resource, and polluted environment.With the pay attention to day by day of environmental pollution and overall cost, realizes blast furnace and be sintered internal dust
Closing and Relatively centralized efficient process are following development trends.
In order to preferably solve the problems, such as that the various dust generated in steel plant are brought, need by research dust pelletizing,
Baking property and its behavior during the sintering process keep the dust generated inside sintering and blast furnace process closing and Relatively centralized high
Effect processing reduces environmental pollution and overall cost, and finally realizes higher economic benefit.
Summary of the invention
In view of the above-mentioned defects in the prior art with deficiency, the purpose of the present invention is to provide a kind of dust granulating process.It should
The various dust that blast furnace region and sintering region generate and byproduct are carried out ingredient granulation by technique, obtain dust green-ball, dust
It is closed and concentrate efficient process, avoid the wasting of resources, reduce environmental pollution and overall cost.
The present invention is also based on dust granulation and provides a kind of agglomeration for iron mine technique, and the technique is by dust green-ball obtained and now
There is the blending ore obtained after sinter mixture two is mixed in sintering process to be arranged in together on sintering pallet to be sintered, effectively benefit
Individually pelletize balling-up with Fe, CaO, MgO and the beneficiating ingredients such as fixed carbon in dust, while by dust, then with after other granulations
Raw materials for sintering mixing, the dust green-ball of greater particle size is concentrated mainly on the lower part of sinter bed, two it is mixed after obtained relatively granule
The sintering feed green-ball of diameter then overlays on above dust green-ball, and dust green-ball plays good skeleton function as a result, is effectively improved burning
The gas permeability of ramming material layer, improves the quality of agglomeration for iron mine product, while also realizing high economic benefit.
The first embodiment according to the present invention provides a kind of dust granulating process:
A kind of dust granulating process, the technique the following steps are included:
1) ingredient: the various dust that blast furnace and/or sintering process generate are subjected to ingredient, basicity is added in ingredient and adjusts
Agent obtains dust ingredient；
2) grinding: the dust ingredient after addition alkalinity regulator is subjected to grinding, the dust ingredient after obtaining grinding；
3) it mixes: the dust ingredient after grinding being mixed, mix dust material is obtained；
4) binder, profit mill, the mix dust material after obtaining profit mill mix grinding: are added in mix dust material；
5) pelletizing: the mix dust material after profit mill is subjected to pelletizing, obtains dust green-ball.
In the present invention, the partial size of dust green-ball obtained in step 5) be 8-16mm, preferably 9-15mm, more preferably
10-14mm。
Preferably, the moisture content of dust green-ball obtained in step 5) be 9-13%, preferably 9.6-12.5%, more
Preferably 10-12%.
In the present invention, the various dust that blast furnace described in step 1) and/or sintering process generate are the secondary ash of blast furnace, height
Furnace cast house ash, blast furnace raw material ash, sintering machine tail dedusting ash, sintering finished dedusting ash, sintered material dedusting ash, the main electricity of sintering remove
One of dust, steel-making liquid steel refining dedusting ash are a variety of.
Preferably, the secondary ash of blast furnace, blast furnace discharge yard ash, blast furnace raw material ash, sintering machine tail dedusting ash, burning in step 1)
Form product dedusting ash, sintered material dedusting ash, the main electro-precipitating dust of sintering, make steel the weight proportion of liquid steel refining dedusting ash as 8-
20:3-15:3-15:30-40:10-25:10-25:0.1-3:0.1-3；Preferably 10-15:5-10:5-10:34-38:15-20:
15-20:0.5-2:0.5-2.
In the present invention, alkalinity regulator described in step 1) is quick lime.Preferably, the additive amount of quick lime is less than
2%, preferably less than 1%.Preferably, the granularity of quick lime is 0-5mm, preferably 0.5-3mm.
In the present invention, the dust ingredient after addition alkalinity regulator is subjected to grinding in step 2), by the grain of dust
Degree is milled to -200 mesh greater than 70%, preferably greater than 75%, more preferably higher than 80%.
In the present invention, the dust ingredient in step 3) after grinding adds water into dust ingredient when being mixed.Make
To be preferred, amount of water 5-8%, preferably 6-7%.
Preferably, the time mixed in step 3) is 30-60s, preferably 35-50s.
In the present invention, binder described in step 4) is bentonite.Preferably, mix dust material is being added in bentonite
Grinding is first carried out before, and bentonitic granularity grinding to -325 mesh is greater than 80%, preferably greater than 90%.Preferably, swollen
The additive amount of profit soil is 0.5-6%, preferably 1-4%.
Preferably, the time of mix grinding is 1-15min, preferably 2.5-10min in step 4).
In the present invention, the mix dust material in step 5) after profit mill is added when carrying out pelletizing into mix dust material
Water.
Preferably, the time of pelletizing is 8-16min, preferably 10-15min in step 5).
Preferably, grinding described in step 2) uses high-pressure roller mill.
Preferably, mixing described in step 3) uses intensive mixer, preferably vertical strengthened mixing machine.
Preferably, mix grinding described in step 4) uses damp mill.
Second of embodiment according to the present invention provides a kind of agglomeration for iron mine technique:
A kind of agglomeration for iron mine technique, the technique the following steps are included:
1) ingredient: the various dust that blast furnace and/or sintering process generate are subjected to ingredient, basicity is added in ingredient and adjusts
Agent obtains dust ingredient；
2) grinding: the dust ingredient after addition alkalinity regulator is subjected to grinding, the dust ingredient after obtaining grinding；
3) it mixes: the dust ingredient after grinding being mixed, mix dust material is obtained；
4) binder, profit mill, the mix dust material after obtaining profit mill mix grinding: are added in mix dust material；
5) pelletizing: the mix dust material after profit mill is subjected to pelletizing, obtains dust green-ball；
6) it is sintered: dust green-ball obtained in step 5) is added in the blending ore obtained after sinter mixture two mixes,
It is sintered together into sintering machine.
In the present invention, the particle diameter distribution of dust green-ball obtained in step 5) be 8-16mm, preferably 9-15mm, it is more excellent
It is selected as 10-14mm.
Preferably, the moisture content of dust green-ball obtained in step 5) be 9-13%, preferably 9.6-12.5%, more
Preferably 10-12%.
In the present invention, the various dust that blast furnace described in step 1) and/or sintering process generate are the secondary ash of blast furnace, height
Furnace cast house ash, blast furnace raw material ash, sintering machine tail dedusting ash, sintering finished dedusting ash, sintered material dedusting ash, the main electricity of sintering remove
One of dust, steel-making liquid steel refining dedusting ash are a variety of.
Preferably, the secondary ash of blast furnace, blast furnace discharge yard ash, blast furnace raw material ash, sintering machine tail dedusting ash, burning in step 1)
Form product dedusting ash, sintered material dedusting ash, the main electro-precipitating dust of sintering, make steel the weight proportion of liquid steel refining dedusting ash as 8-
20:3-15:3-15:30-40:10-25:10-25:0.1-3:0.1-3；Preferably 10-15:5-10:5-10:34-38:15-20:
15-20:0.5-2:0.5-2.
In the present invention, alkalinity regulator described in step 1) is quick lime.Preferably, the additive amount of quick lime is less than
2%, preferably less than 1%.Preferably, the granularity of quick lime is 0-5mm, preferably 0.5-3mm.
In the present invention, the dust ingredient after addition alkalinity regulator is subjected to grinding in step 2), by the granularity of dust
- 200 mesh are milled to greater than 70%, preferably greater than 75%, more preferably higher than 80%.
In the present invention, the dust ingredient in step 3) after grinding adds water into dust ingredient when being mixed.Make
To be preferred, amount of water 5-8%, preferably 6-7%.
Preferably, the time mixed in step 3) is 30-60s, preferably 35-50s.
In the present invention, binder described in step 4) is bentonite.Preferably, mix dust material is being added in bentonite
Grinding is first carried out before, and bentonitic granularity grinding to -325 mesh is greater than 80%, preferably greater than 90%.Preferably, swollen
The additive amount of profit soil is 0.5-6%, preferably 1-4%.
Preferably, the time of mix grinding is 1-15min, preferably 2.5-10min in step 4).
In the present invention, the mix dust material in step 5) after profit mill is added when carrying out pelletizing into mix dust material
Water.
Preferably, the time of pelletizing is 8-16min, preferably 10-15min in step 5).
Preferably, grinding described in step 2) uses high-pressure roller mill.
Preferably, mixing described in step 3) uses intensive mixer, preferably vertical strengthened mixing machine.
Preferably, mix grinding described in step 4) uses damp mill.
The dust processing different from the past of dust granulating process in the present invention or Land use systems.In the present invention, blast furnace
The ingredient and pelletizing that the various dust generated with sintering process are not involved in sinter mixture in existing sintering process are pelletized, each dust
The step of by special ingredient, grinding, mixing, mix grinding and pelletizing, be made greater particle size (particle diameter distribution 8-16mm, preferably
For the dust green-ball of 9-15mm, more preferably 10-14mm), dust green-ball then with sinter mixture two in existing sintering process
The blending ore obtained after mixed is sintered into sintering machine together.In general, sinter mixture two is mixed in existing sintering process
The partial size of the sintering feed green-ball obtained afterwards is smaller, is 4-5mm.The dust green-ball of greater particle size and the sintering feed compared with small particle is raw
Ball arranges on the sintering machine trolley that existing spreader of sintering machine used is ball roller cloth dress by spreader of sintering machine together
Set, ball roller distribution device generates natural segregation to mix size and acts on, therefore, by ball roller distribution device to sintering machine into
Row cloth, it can be achieved that mixture by particle size be layered, incrementally increase sinter bed top to the green-ball partial size of lower part, i.e., compared with
Large-sized dust green-ball is concentrated mainly on the lower part of sinter bed, and the sintering feed green-ball compared with small particle overlays on dust green-ball
Face.The dust green-ball positioned at the greater particle size of sinter bed lower part then plays the sinter bed on entire sintering pallet as a result,
Good skeleton function has been arrived, so as to improve the gas permeability of sinter bed, has effectively improved sinter quality.
Technical solution of the present invention is by individually pelletizing dust, and the partial size of manufactured dust green-ball is far longer than burning
Tie pelletizing partial size made of mixture.The partial size of manufactured dust green-ball is greater than 8mm, and the partial size of two mixed rear sinter mixtures is 4-
5mm.Since the material composition of dust being collected into and new sintering raw material have differences, if the dust of collection is directly useless
Abandoning had not only wasted limited resource, but also polluted environment；But it is former if the dust being collected into is added directly into new sintering
In material, it is blended grain by two with new sintering raw material, then dust will enter as a part in the sintering feed after granulation
Sintering process will affect the quality of entire sinter due to the difference of material composition in dust.In the prior art, dust is added
Raw material are sintered, then infiltrate capable granulation by two together, sintering feed is obtained and is sintered, due to the presence of dust, influence to be sintered
The quality of sinter afterwards.The present invention adopts the technology that: dust individually pelletized, the sintering feed that partial size is greater than 8mm is made,
And be added directly into two it is mixed after sintering feed in, be not involved in the process that new sintering raw material are mixed and pelletized, newly
It is sintered raw material to carry out also according to original technique, the sintering feed that partial size is 4-5mm is made；Then it is filled by sintering feed cloth
Carry out cloth is set, since the partial size that sintering feed is made with new sintering raw material in the partial size of dust green-ball has differences, passes through cloth
Expect the segregation effect of device, dust green-ball can naturally concentrate on the lower bed of material of sintering machine, and new sintering raw material are obtained to be burnt
The upper bed of material for the sintering machine that ramming material is naturally concentrated, dust green-ball play skeleton function in the entire sintering machine bed of material, improve
The gas permeability of the sintering machine bed of material.The dust of collection is individually pelletized: the first, resource is utilized, reduces the dirt to environment
Dye；The second, granulation and the sintering effect of new sintering raw material are not influenced；Third, the arrangement for improving the sintering machine bed of material play bone
The dust green-ball of frame effect improves the gas permeability of the bed of material.
In general, the gas permeability quality of sinter bed, will directly influence entire sintering process, influences sinter
Quality.Sintering plant both domestic and external is all focused on working hard in the gas permeability for improving sinter bed very much.In the present invention, by dust system
Individually dust green-ball obtained forms new sintering process for being sintered to grain technique.In new sintering process, dust green-ball by
Larger in its partial size, when cloth, then focuses more on the lower part of sinter bed, plays skeleton function, effectively improves sintering
The gas permeability of the bed of material.Firstly, the gas permeability of sinter bed is improved, the resistance of blower reduces, and passes through the effective wind rate of the bed of material
Increase, improves vertical sintering speed, it is intensified-sintered；Meanwhile improving the gas permeability of sinter bed, the thickness of sinter bed can be increased
Degree, deep-bed sintering are conducive to calcium ferrite and Fe2O3The generation of mineral facies can drop low FeO content and improve sinter strength；Again
Person, sinter bed have auto accumulation heat effect, and sintering solid burnup can then be reduced by increasing thickness of feed layer, save resource, and
Solid burnup is reduced, and sintering process SOx, NOx and CO are also reduced from source2Generation；In addition, improving the saturating of sinter bed
Gas, the negative pressure in sintering machine reduce, and the air blasted can come into full contact with sulfide, and the reaction that enables to bake with agglomeration is strong
Change, accelerates rate of sulphur expulsion.In addition, if the gas permeability of sinter bed is bad, it is likely that lead to the local temperature of sinter bed sharply
Rise, the content of NOx quicklys increase at this time, that is to say, that the gas permeability for improving sinter bed also reduces NOx from source
Generation.
In the present invention, purpose dust individually pelletized: the first, the biggish dust green-ball of partial size is made, is burning
Skeleton function is played in the bed of material of knot machine；If the dust green-ball after granulation two, is added to mixing machine or mixed processes again
In (such as two mixed), this will lead to the dust green-ball of original obtained greater particle size in mixing machine, due to ablation, reduce powder
The partial size of dirt green-ball, so that the purpose of skeleton function be not achieved；If three, the dust green-ball after granulation is added to again mixed
In conjunction machine or mixed processes (such as two mixed), so that dust green-ball mixes excessively uniform with other sintering feeds, new burning is influenced
Tie the sintering character of the sintering feed of raw material preparation.Using technique of the invention, the biggish dust green-ball of partial size is made and is being sintered
When expecting cloth, the lower bed of material of sintering machine is concentrated on, can be according to the particular use of sinter after sintering, it will be on sintering machine
Sinter (the dust green-ball of sinter (sinter that the sintering feed of new sintering raw material preparation obtains) and the lower bed of material of the bed of material
The sinter of acquisition) it distinguishes, the sinter of different qualities is for various applications；The product of original sinter are not reduced not only
Matter can also improve new conversely, because the cloth of dust green-ball, improves the gas permeability of sinter bed, improve sintering character
Sintering raw material preparation sintering feed obtain sinter quality.
It individually pelletizes in addition, the present invention passes through dust, the moisture content of obtained dust green-ball is particularly critical.
Testing program and fixed experimental condition are as follows: iron dust containing and bentonite mix, then in 1 meter of diameter of disk pelletizing
Pelletizing is carried out to mixture on machine.Raw material moisture 3.5%, green-ball moisture 11.7% or so, bentonite consumption 2.0%, when pelletizing
Between 12 minutes, pelletizing partial size 8-15mm, investigate influence of the green-ball moisture to pelletizing yield and quality index, the main result of acquisition
It is as shown in the table.
Influence of the green-ball moisture to pellet quality index
In the present invention, the moisture content of dust green-ball obtained be 9-13%, preferably 9.6-12.5%, more preferably
10-12%, such as 11.7%.Total weight of the moisture content based on dust green-ball.The present invention is individually pelletized using dust, and is made
The dust green-ball obtained is relatively large in diameter, and is had any different with the existing moisture content using in sintering raw material granulation, existing using burning
Tying the moisture content in raw material granulation is 6%~7%, and its grain intensity obtained is not high.As seen from the above table, powder of the invention
Moisture content is improved in dirt green-ball, shatter strength of green pellet and compression strength are all significantly improved.Meanwhile corresponding control dust life
Moisture content in ball guarantees its overall performance；It avoids burst temperature too low, influences the sintering of sintering feed, guarantee sinter
Quality.
In the present invention, it is dry that the various dust that blast furnace described in step 1) and/or sintering process generate are primarily referred to as particulate
Dust, including but not limited to blast furnace secondary ash, blast furnace raw material ash, sintering machine tail dedusting ash, sintering finished remove blast furnace discharge yard ash
Dust, sintered material dedusting ash, the main electro-precipitating dust of sintering, steel-making liquid steel refining dedusting ash, steel-making liquid steel refining dedusting ash are wrapped again
Include one, two steel-making liquid steel refining dedusting ash.Wherein, the secondary ash of blast furnace, blast furnace discharge yard ash, blast furnace raw material ash, sintering machine tail remove
Dust, sintering finished dedusting ash, sintered material dedusting ash, the main electro-precipitating dust of sintering, the weight for making steel liquid steel refining dedusting ash are matched
Than being preferably 8-20:3-15:3-15:30-40:10-25:10-25:0.1-3:0.1-3；Preferably 10-15:5-10:5-10:
34-38:15-20:15-20:0.5-2:0.5-2 such as 12:8:8:36:18:17:1:1.Due to the physical chemistry of each dust
Matter has a certain difference, thus under the proportion, the pelletizing better effect of dust, the physical chemistry of obtained dust green-ball
Matter is more stable, also achieves maximally utilizing for each dust.
Substitute as sintering crude fuel finally is participated in burning by the dust green-ball that dust granulating process of the invention obtains
Knot, therefore, the alkalinity regulator in the present invention is preferably quick lime, and quick lime participates in part quick lime as flux raw material
Into the ingredient of dust, it is possible to reduce the dosage of flux in sintered material room, while improving the basicity of dust green-ball.In the present invention
In, the granularity of quick lime is 0-5mm, preferably 0.5-3mm.The particle size of quick lime is controlled, guarantees dust green-ball obtained
Partial size be greater than 8mm；If the partial size of alkalinity regulator is excessive, it is unfavorable for the granulation of dust, leads to the partial size mistake of dust green-ball
It is small, it is unfavorable for it and plays skeleton function in sinter bed.
In the present invention, granularity of dust is milled to -200 mesh (less than 200 using high-pressure roller mill by the grinding step of step 2)
Mesh) dust ratio be greater than 70% (preferably greater than 75%, more preferably higher than 80%).The purpose of grinding step mainly will
The various dust that blast furnace and sintering process generate are milled to certain particle size, to increase the balling-up of each dust.If the balling-up of each dust
Property is poor, then will affect subsequent pelletizing process, can not generate the dust green-ball of greater particle size, the partial size of dust green-ball is not
It is enough, it will be unable to cloth in the lower part of sinter bed and play skeleton function, to influence the gas permeability of sinter bed.The present invention is from each
The source of kind raw material is started with, and the partial size of various raw materials is controlled, to guarantee the partial size of last dust green-ball obtained.
In the present invention, the mixing step of step 3) uses intensive mixer (preferably vertical strengthened mixing machine, such as R24
Vertical strengthened mixing machine), mixing while, adds water into mixing machine.The working principle of intensive mixer be by stirrer paddle with
Moving toward one another between tempering tank makes material generation move toward one another and interpenetrate, and reaches and mixes well purpose；It is mixed using strength
Conjunction machine can save electric energy, reduce consumption of binder, enhance green ball strength, improve the material uniformity.Therefore, the mesh of mixing step
Primarily to each dust is made to interpenetrate and moving toward one another, achieve the purpose that each dust mixes well, to increase powder
The balling-up of dirt improves the intensity of subsequent dust green-ball.
In the present invention, the mix grinding step of step 4) uses damp mill.In general, profit time consuming is longer, finally makes
Dust green-ball drop strength and compression strength it is higher, but moisten time consuming can not be too long, the time is too long, dust green-ball it is quick-fried
Splitting temperature can then decline, therefore control profit time consuming at 1-15min (preferably 2.5-10min) in the present invention.Mix grinding step
In be also added into binder (preferably bentonite), i.e., the step by profit mill, improve each dust and binder fineness and
Specific surface area improves the balling property of dust, and further mixes each dust and binder.Mix dust material is being added in binder
Before, its granularity is milled to greater than 80% (preferably greater than 90%) by -325 mesh by grinding, the grinding of binder also for
Increase its fineness and specific surface area, it enable preferably to mix with dust, with enhance dust subsequent pelletizing step at
Ball guarantees the partial size of last dust green-ball obtained.
In the present invention, the pelletizing step of step 5) carries out pelletizing using pelletizer.Water is added while pelletizing, profit is allowed to grind
Mix dust material afterwards carries out pelletizing in the case where spray water on pelletizer.In general, with the extension of Balling time,
Green ball strength has clear improvement, but Balling time is more than that cracking temperature of green pel let can be lower than 600 DEG C, therefore in the present invention after 16min
Balling time is controlled at 8-16min (preferably 10-15min).And the dust green-ball made can as green-ball moisture increases
Improve shatter strength of green pellet and compression strength；But green-ball moisture is more than 13%, intensity is then begun to decline, therefore raw in the present invention
At the moisture content of dust green-ball be 9-13% (preferably 9.6-12.5%, more preferably 10-12%, such as 11.7%).
In the present invention, the particle diameter distribution for the dust green-ball that pelletizer has been made is 8-16mm (preferably 9-15mm, more preferably 10-
14mm), the partial size of dust green-ball is bigger, then the segregation distribution on sintering pallet is more obvious, and the gas permeability of sintering process is better,
But the partial size of dust green-ball can not be too big, and the drop strength decline of the too big then green-ball of partial size is easy in cloth on sintering machine
It is broken into pieces, reduces the gas permeability of sinter bed instead.
In existing sintering process, sinter mixture is sintered often through after two mixed pelletizings into sintering machine, and two mix i.e.
For a trommel mixer, pelletizing effect is limited, therefore, in existing sintering process two it is mixed after sintering feed green-ball grain
Diameter distribution is generally 4-5mm.And in the present invention, the various dust of blast furnace and sintering process generation pass through special grinding, mix
Conjunction and mix grinding step, the fineness and specific surface area for improving each dust mix well so that interpenetrating between each dust, to change
The balling property of kind dust, it is 8-16mm (preferably 9-15mm, more preferably 10- that particle diameter distribution finally, which is made, in pelletizing step
Dust green-ball 14mm).Therefore, dust green-ball obtained is not necessarily to participate in the two mixed of existing sintering process in the present invention, but straight
It connects to be arranged in together on sintering pallet with two blending ores after mixed and be sintered, in this way, the dust green-ball of greater particle size
With the sintering feed green-ball compared with small particle by the segregation distribution of spreader of sintering machine, i.e. realization dust green-ball is pressed with sintering feed green-ball
Particle size layering, wherein the dust green-ball of greater particle size concentrates on the lower part of sinter bed, skeleton function is played, thus effectively
Improve the gas permeability of sinter bed.
In dust granulating process of the invention, each dust is weighed with alkalinity regulator (preferably quick lime) by proportion scale
Corresponding weight obtains dust ingredient；Dust ingredient is delivered to high-pressure roller mill and carries out grinding by apron conveyer, obtains grinding
Dust ingredient afterwards；Dust ingredient after grinding is delivered to intensive mixer and mixed by apron conveyer, while mixing
Water is added, dust ingredient obtains mix dust material after mixing well；Belt conveyor by mix dust material be delivered to damp mill into
Row profit mill, while binder (preferably bentonite) is added, the mix dust material after profit mill is obtained after further mixing；Belt conveying
Mix dust material after profit mill is delivered to pelletizer and carries out pelletizing by machine, and water is added in pelletizing while, and greater particle size is made
The dust green-ball of (8-16mm, preferably 9-15mm, more preferably 10-14mm).Dust green-ball participates in subsequent sintering process, shape
The agglomeration for iron mine technique of Cheng Xin.In agglomeration for iron mine technique of the invention, burnt in dust green-ball obtained and existing sintering process
The blending ore obtained after knot mixture two is mixed, which is arranged in together on sintering pallet, to be sintered, and the inclined of spreader of sintering machine is passed through
It analyses cloth and realizes that dust green-ball and sintering feed green-ball are layered by particle size, to be effectively improved the gas permeability of sinter bed.
In the present invention, the grinding uses high-pressure roller mill.The mixing uses intensive mixer.The mix grinding uses
Damp mill.Waterworks are arranged on the pelletizing disk of pelletizer, wherein waterworks are preferably mist in pelletizer the using and the reserved
Change spray head, so that the mix dust material after profit mill carries out pelletizing in the case where spray water on pelletizer.
In the present invention, the quick lime additive amount in step 1), the amount of water in step 3), the bentonite in step 4) add
Dosage each means that respectively ingredient accounts for the weight ratio of entire dust ingredient total amount for its.
Compared with prior art, the invention has the following advantages:
1, the various dust that the blast furnace of steel plant and sintering process generate usually all contain higher Fe, CaO, MgO and consolidate
Determine the beneficiating ingredients such as carbon, the substitute that can be used as sintering crude fuel is used；But it can directly add in supplying raw materials for sintering
Weight is former to burn process whole process dust pollution, and will produce bigger effect to sintering process gas permeability, yield and quality and organization of production；
The practical year recovery utilization rate of blast furnace and the internal dust of sintering is maintained at 80% or so of year occurrence quantity, discarded 20% at present
(the mainly secondary ash of blast furnace) had not only wasted limited resource, but also polluted environment；Dust granulating process of the invention and subsequent
Sintering process then solve the problems, such as the wasting of resources and environmental pollution；
2, dust granulating process proposed by the invention, the technique pass through ingredient, grinding, mixing, mix grinding and pelletizing process
Greater particle size is made in each grain dust and there is the pelletizing of higher-strength, simple process, dust granulating efficiency is good, and obtained
Dust green-ball ingredient is preferable；The closed and concentration efficient process of dust, avoids the wasting of resources, reduces environmental pollution and synthesis
Cost；
3, the present invention is based on the agglomeration for iron mine technique that dust granulation proposes, the technique is by dust green-ball obtained and existing burning
The blending ore obtained after sinter mixture two is mixed in knot technique, which is arranged in together on sintering pallet, to be sintered, and powder is efficiently used
The beneficiating ingredients such as Fe, CaO, MgO and fixed carbon in dirt, while segregation distribution concentrates the dust green-ball of greater particle size mainly
In the lower part of sinter bed, two it is mixed after the obtained sintering feed green-ball of relatively small particle then overlay on above dust green-ball, greater particle size
Dust green-ball play good skeleton function, be effectively improved the gas permeability of sinter bed, improve the matter of the product of sinter
Amount；
4, in the present invention, by after dust green-ball obtained supplying sintering, existing dust processing side on the one hand can be improved
Dust is directly incorporated sintering adverse effect in formula, on the other hand can reduce coke powder dosage, reach energy-saving mesh
, meanwhile, after the gas permeability of sinter bed obtains improvement, the thickness of sinter bed can increase, to reduce sintering solid combustion
Consumption saves resource, sintering process SOx, NOx and CO is also reduced from source2Generation.
Detailed description of the invention
Fig. 1 is the flow chart of a kind of dust granulating process of the present invention and follow-up sintering technique.
Specific embodiment
The first embodiment according to the present invention provides a kind of dust granulating process:
A kind of dust granulating process, the technique the following steps are included:
1) ingredient: the various dust that blast furnace and/or sintering process generate are subjected to ingredient, basicity is added in ingredient and adjusts
Agent obtains dust ingredient；
2) grinding: the dust ingredient after addition alkalinity regulator is subjected to grinding, the dust ingredient after obtaining grinding；
3) it mixes: the dust ingredient after grinding being mixed, mix dust material is obtained；
4) binder, profit mill, the mix dust material after obtaining profit mill mix grinding: are added in mix dust material；
5) pelletizing: the mix dust material after profit mill is subjected to pelletizing, obtains dust green-ball.
In the present invention, the partial size of dust green-ball obtained in step 5) be 8-16mm, preferably 9-15mm, more preferably
10-14mm。
Preferably, the moisture content of dust green-ball obtained in step 5) be 9-13%, preferably 9.6-12.5%, more
Preferably 10-12%.
In the present invention, the various dust that blast furnace described in step 1) and/or sintering process generate are the secondary ash of blast furnace, height
Furnace cast house ash, blast furnace raw material ash, sintering machine tail dedusting ash, sintering finished dedusting ash, sintered material dedusting ash, the main electricity of sintering remove
One of dust, steel-making liquid steel refining dedusting ash are a variety of.
Preferably, the secondary ash of blast furnace, blast furnace discharge yard ash, blast furnace raw material ash, sintering machine tail dedusting ash, burning in step 1)
Form product dedusting ash, sintered material dedusting ash, the main electro-precipitating dust of sintering, make steel the weight proportion of liquid steel refining dedusting ash as 8-
20:3-15:3-15:30-40:10-25:10-25:0.1-3:0.1-3；Preferably 10-15:5-10:5-10:34-38:15-20:
15-20:0.5-2:0.5-2.
In the present invention, alkalinity regulator described in step 1) is quick lime.Preferably, the additive amount of quick lime is less than
2%, preferably less than 1%.Preferably, the granularity of quick lime is 0-5mm, preferably 0.5-3mm.
In the present invention, the dust ingredient after addition alkalinity regulator is subjected to grinding in step 2), by the granularity of dust
- 200 mesh are milled to greater than 70%, preferably greater than 75%, more preferably higher than 80%.
In the present invention, the dust ingredient in step 3) after grinding adds water into dust ingredient when being mixed.Make
To be preferred, amount of water 5-8%, preferably 6-7%.
Preferably, the time mixed in step 3) is 30-60s, preferably 35-50s.
In the present invention, binder described in step 4) is bentonite.Preferably, mix dust material is being added in bentonite
Grinding is first carried out before, and bentonitic granularity grinding to -325 mesh is greater than 80%, preferably greater than 90%.Preferably, swollen
The additive amount of profit soil is 0.5-6%, preferably 1-4%.
Preferably, the time of mix grinding is 1-15min, preferably 2.5-10min in step 4).
In the present invention, the mix dust material in step 5) after profit mill is added when carrying out pelletizing into mix dust material
Water.
Preferably, the time of pelletizing is 8-16min, preferably 10-15min in step 5).
Preferably, grinding described in step 2) uses high-pressure roller mill.
Preferably, mixing described in step 3) uses intensive mixer, preferably vertical strengthened mixing machine.
Preferably, mix grinding described in step 4) uses damp mill.
Second of embodiment according to the present invention provides a kind of agglomeration for iron mine technique:
A kind of agglomeration for iron mine technique, the technique the following steps are included:
1) ingredient: the various dust that blast furnace and/or sintering process generate are subjected to ingredient, basicity is added in ingredient and adjusts
Agent obtains dust ingredient；
2) grinding: the dust ingredient after addition alkalinity regulator is subjected to grinding, the dust ingredient after obtaining grinding；
3) it mixes: the dust ingredient after grinding being mixed, mix dust material is obtained；
4) binder, profit mill, the mix dust material after obtaining profit mill mix grinding: are added in mix dust material；
5) pelletizing: the mix dust material after profit mill is subjected to pelletizing, obtains dust green-ball；
6) it is sintered: dust green-ball obtained in step 5) is added in the blending ore obtained after sinter mixture two mixes,
It is sintered together into sintering machine.
In the present invention, the particle diameter distribution of dust green-ball obtained in step 5) be 8-16mm, preferably 9-15mm, it is more excellent
It is selected as 10-14mm.
Preferably, the moisture content of dust green-ball obtained in step 5) be 9-13%, preferably 9.6-12.5%, more
Preferably 10-12%.
In the present invention, the various dust that blast furnace described in step 1) and/or sintering process generate are the secondary ash of blast furnace, height
Furnace cast house ash, blast furnace raw material ash, sintering machine tail dedusting ash, sintering finished dedusting ash, sintered material dedusting ash, the main electricity of sintering remove
One of dust, steel-making liquid steel refining dedusting ash are a variety of.
Preferably, the secondary ash of blast furnace, blast furnace discharge yard ash, blast furnace raw material ash, sintering machine tail dedusting ash, burning in step 1)
Form product dedusting ash, sintered material dedusting ash, the main electro-precipitating dust of sintering, make steel the weight proportion of liquid steel refining dedusting ash as 8-
20:3-15:3-15:30-40:10-25:10-25:0.1-3:0.1-3；Preferably 10-15:5-10:5-10:34-38:15-20:
15-20:0.5-2:0.5-2.
In the present invention, alkalinity regulator described in step 1) is quick lime.Preferably, the additive amount of quick lime is less than
2%, preferably less than 1%.Preferably, the granularity of quick lime is 0-5mm, preferably 0.5-3mm.
In the present invention, the dust ingredient after addition alkalinity regulator is subjected to grinding in step 2), by the granularity of dust
- 200 mesh are milled to greater than 70%, preferably greater than 75%, more preferably higher than 80%.
In the present invention, the dust ingredient in step 3) after grinding adds water into dust ingredient when being mixed.Make
To be preferred, amount of water 5-8%, preferably 6-7%.
Preferably, the time mixed in step 3) is 30-60s, preferably 35-50s.
In the present invention, binder described in step 4) is bentonite.Preferably, mix dust material is being added in bentonite
Grinding is first carried out before, and bentonitic granularity grinding to -325 mesh is greater than 80%, preferably greater than 90%.Preferably, swollen
The additive amount of profit soil is 0.5-6%, preferably 1-4%.
Preferably, the time of mix grinding is 1-15min, preferably 2.5-10min in step 4).
In the present invention, the mix dust material in step 5) after profit mill is added when carrying out pelletizing into mix dust material
Water.
Preferably, the time of pelletizing is 8-16min, preferably 10-15min in step 5).
Preferably, grinding described in step 2) uses high-pressure roller mill.
Preferably, mixing described in step 3) uses intensive mixer, preferably vertical strengthened mixing machine.
Preferably, mix grinding described in step 4) uses damp mill.
Embodiment 1
A kind of dust granulating process, the technique the following steps are included:
1) ingredient: the various dust that blast furnace and sintering process generate are subjected to ingredient, alkalinity regulator is added in ingredient, obtains
To dust ingredient；
2) grinding: the dust ingredient after addition alkalinity regulator is subjected to grinding, the dust ingredient after obtaining grinding；
3) it mixes: the dust ingredient after grinding being mixed, mix dust material is obtained；
4) binder, profit mill, the mix dust material after obtaining profit mill mix grinding: are added in mix dust material；
5) pelletizing: the mix dust material after profit mill is subjected to pelletizing, obtains dust green-ball.
The various dust that blast furnace described in step 1) and sintering process generate include the secondary ash of blast furnace, blast furnace discharge yard ash,
Blast furnace raw material ash, sintering machine tail dedusting ash, sintering finished dedusting ash, sintered material dedusting ash, the main electro-precipitating dust of sintering, steel-making steel
Crystal refines dedusting ash.Wherein, the secondary ash of blast furnace, blast furnace discharge yard ash, blast furnace raw material ash, sintering machine tail dedusting ash, sintering finished
Dedusting ash, the main electro-precipitating dust of sintering, makes steel the weight proportion of liquid steel refining dedusting ash as 12:8:8:36 at sintered material dedusting ash:
18:17:1:1.Alkalinity regulator described in step 1) is quick lime.The additive amount of quick lime is 0.8%.The granularity of quick lime is
0.5-3mm。
The dust ingredient after addition alkalinity regulator is subjected to grinding in step 2), it is big that the granularity of dust is milled to -200 mesh
In 70%.
Dust ingredient in step 3) after grinding adds water into dust ingredient when being mixed.Amount of water is 6%.
The time mixed in step 3) is 40s.
Binder described in step 4) is bentonite.Bentonite first carries out grinding before mix dust material is added, will be swollen
Granularity grinding to -325 mesh for moistening soil are greater than 80%.Bentonitic additive amount is 1%.The time of mix grinding is 10min in step 4).
Mix dust material in step 5) after profit mill adds water into mix dust material when carrying out pelletizing.In step 5)
The time of pelletizing is 10min.
Grinding described in step 2) uses high-pressure roller mill.Mixing described in step 3) uses vertical strengthened mixing machine.Step
It is rapid 4) described in mix grinding use damp mill.
The partial size of dust green-ball obtained in step 5) is 8.5mm.The moisture content of dust green-ball obtained in step 5)
It is 11.7%.
Embodiment 2
Embodiment 1 is repeated, the dust ingredient after addition alkalinity regulator is only subjected to grinding in step 2), by dust
Granularity is milled to -200 mesh greater than 80%.Amount of water of the dust ingredient when being mixed in step 3) after grinding is 7%.Step
4) bentonite carries out grinding before mix dust material is added in, and bentonitic granularity grinding to -325 mesh is greater than 90%.It is swollen
The additive amount of profit soil is 4%.The time of pelletizing is 15min in step 5).
The partial size of dust green-ball obtained in step 5) is 12mm.The moisture content of dust green-ball obtained in step 5) is
11.9%.
Embodiment 3
A kind of agglomeration for iron mine technique, the technique the following steps are included:
1) ingredient: the various dust that blast furnace and sintering process generate are subjected to ingredient, alkalinity regulator is added in ingredient, obtains
To dust ingredient；
2) grinding: the dust ingredient after addition alkalinity regulator is subjected to grinding, the dust ingredient after obtaining grinding；
3) it mixes: the dust ingredient after grinding being mixed, mix dust material is obtained；
4) binder, profit mill, the mix dust material after obtaining profit mill mix grinding: are added in mix dust material；
5) pelletizing: the mix dust material after profit mill is subjected to pelletizing, obtains dust green-ball；
6) it is sintered: dust green-ball obtained in step 5) is added in the blending ore obtained after sinter mixture two mixes,
It is sintered together into sintering machine.
The various dust that blast furnace described in step 1) and sintering process generate include the secondary ash of blast furnace, blast furnace discharge yard ash,
Blast furnace raw material ash, sintering machine tail dedusting ash, sintering finished dedusting ash, sintered material dedusting ash, the main electro-precipitating dust of sintering, steel-making steel
Crystal refines dedusting ash.Wherein, the secondary ash of blast furnace, blast furnace discharge yard ash, blast furnace raw material ash, sintering machine tail dedusting ash, sintering finished
Dedusting ash, the main electro-precipitating dust of sintering, makes steel the weight proportion of liquid steel refining dedusting ash as 12:8:8:36 at sintered material dedusting ash:
18:17:1:1.Alkalinity regulator described in step 1) is quick lime.The additive amount of quick lime is 0.8%.The granularity of quick lime is
0.5-3mm。
The dust ingredient after addition alkalinity regulator is subjected to grinding in step 2), it is big that the granularity of dust is milled to -200 mesh
In 70%.
Dust ingredient in step 3) after grinding adds water into dust ingredient when being mixed.Amount of water is 6%.
The time mixed in step 3) is 40s.
Binder described in step 4) is bentonite.Bentonite first carries out grinding before mix dust material is added, will be swollen
Granularity grinding to -325 mesh for moistening soil are greater than 80%.Bentonitic additive amount is 1%.The time of mix grinding is 10min in step 4).
Mix dust material in step 5) after profit mill adds water into mix dust material when carrying out pelletizing.In step 5)
The time of pelletizing is 10min.
The moisture content of dust green-ball obtained in step 5) is 11.7%.
Grinding described in step 2) uses high-pressure roller mill.Mixing described in step 3) uses vertical strengthened mixing machine.Step
It is rapid 4) described in mix grinding use damp mill.
Embodiment 4
Embodiment 3 is repeated, the various dust that only blast furnace described in step 1) and sintering process generate include that blast furnace is secondary
Ash, blast furnace discharge yard ash, blast furnace raw material ash, sintering machine tail dedusting ash, sintering finished dedusting ash, sintered material dedusting ash, sintering
Main electro-precipitating dust, steel-making liquid steel refining dedusting ash.Wherein, the secondary ash of blast furnace, blast furnace discharge yard ash, blast furnace raw material ash, sintering machine
Tail dedusting ash, sintering finished dedusting ash, sintered material dedusting ash, the main electro-precipitating dust of sintering, the weight for making steel liquid steel refining dedusting ash
Amount proportion is 12:8:8:36:18:17:1:1.Alkalinity regulator described in step 1) is quick lime.The additive amount of quick lime is
0.5%.The granularity of quick lime is 1-2mm.
The dust ingredient after addition alkalinity regulator is subjected to grinding in step 2), it is big that the granularity of dust is milled to -200 mesh
In 75%.
Dust ingredient in step 3) after grinding adds water into dust ingredient when being mixed.Amount of water is 5%.
The time mixed in step 3) is 50s.
Binder described in step 4) is bentonite.Bentonite first carries out grinding before mix dust material is added, will be swollen
Granularity grinding to -325 mesh for moistening soil are greater than 90%.Bentonitic additive amount is 3%.The time of mix grinding is 6min in step 4).
Mix dust material in step 5) after profit mill adds water into mix dust material when carrying out pelletizing.In step 5)
The time of pelletizing is 12min.
The moisture content of dust green-ball obtained in step 5) is 11.7%.
Grinding described in step 2) uses high-pressure roller mill.Mixing described in step 3) uses vertical strengthened mixing machine.Step
It is rapid 4) described in mix grinding use damp mill.
Comparative example 1
A kind of agglomeration for iron mine technique, the technique the following steps are included:
1) ingredient: the various dust that blast furnace and sintering process generate are subjected to ingredient, alkalinity regulator is added in ingredient, obtains
To dust ingredient；
2) grinding: the dust ingredient after addition alkalinity regulator is subjected to grinding, the dust ingredient after obtaining grinding；
3) it mixes: the dust ingredient after grinding being mixed, mix dust material is obtained；
4) binder, profit mill, the mix dust material after obtaining profit mill mix grinding: are added in mix dust material；
5) pelletizing: the mix dust material after profit mill is subjected to pelletizing, obtains dust green-ball；
6) it is sintered: dust green-ball obtained in step 5) being added to two mixed processes together with sinter mixture and carries out two
It is mixed, then it is sintered together into sintering machine.
The various dust that blast furnace described in step 1) and sintering process generate include the secondary ash of blast furnace, blast furnace discharge yard ash,
Blast furnace raw material ash, sintering machine tail dedusting ash, sintering finished dedusting ash, sintered material dedusting ash, the main electro-precipitating dust of sintering, steel-making steel
Crystal refines dedusting ash.Wherein, the secondary ash of blast furnace, blast furnace discharge yard ash, blast furnace raw material ash, sintering machine tail dedusting ash, sintering finished
Dedusting ash, the main electro-precipitating dust of sintering, makes steel the weight proportion of liquid steel refining dedusting ash as 15:10:10 at sintered material dedusting ash:
32:15:18:2:2.Alkalinity regulator described in step 1) is quick lime.The additive amount of quick lime is 0.8%.The grain of quick lime
Degree is 0.5-3mm.
The dust ingredient after addition alkalinity regulator is subjected to grinding in step 2), it is big that the granularity of dust is milled to -200 mesh
In 70%.
Dust ingredient in step 3) after grinding adds water into dust ingredient when being mixed.Amount of water is 6%.
The time mixed in step 3) is 40s.
Binder described in step 4) is bentonite.Bentonite first carries out grinding before mix dust material is added, will be swollen
Granularity grinding to -325 mesh for moistening soil are greater than 80%.Bentonitic additive amount is 1%.The time of mix grinding is 10min in step 4).
Mix dust material in step 5) after profit mill adds water into mix dust material when carrying out pelletizing.In step 5)
The time of pelletizing is 10min.
The moisture content of dust green-ball obtained in step 5) is 11.7%.
Grinding described in step 2) uses high-pressure roller mill.Mixing described in step 3) uses vertical strengthened mixing machine.Step
It is rapid 4) described in mix grinding use damp mill.
Comparative example 2
Embodiment 3 is repeated, only the granularity of quick lime is 6mm in step 1).
The dust ingredient after addition alkalinity regulator is subjected to grinding in step 2), the granularity of dust is milled to -200 purposes
It is 60%.
Binder described in step 4) is bentonite.Bentonite first carries out grinding before mix dust material is added, will be swollen
Granularity grinding to -325 purposes for moistening soil are 65%.Bentonitic additive amount is 3%.The time of mix grinding is 6min in step 4).
Record the technical effect of each embodiment technical solution, such as following table.
1 test effect data of table
As can be seen from the above table, in the embodiment of the present invention 3 and 4, dust is individually granulation into partial size is biggish to be divided into green-ball,
Cloth is sintered on sintering machine together with other sintering feeds；Compared to comparative example 1, in technical solution of the present invention, dust
Green-ball plays skeleton function in sintering feed, improves performance of ventilating, can increase the thickness of feed layer on sintering machine, reduce making for fuel
With, saving fan energy consumption, while reducing the generation of nitrogen oxides.
In the embodiment of the present invention 3 and 4, by the various raw materials for being granulation into dust green-ball in strict accordance with require grinding to defined
Partial size, the diameter of dust green-ball obtained are 8.5mm；In comparative example 2, the diameter of each raw material is relatively large, and manufactured dust is raw
The diameter of ball is 6.1mm.It can be seen that from its test effect when the diameter of dust green-ball is smaller, skeleton function is unobvious,
The diameter of dust green-ball produced by the present invention is greater than 8mm, and more preferably, fuel uses reduction, blower energy to performance of ventilating improvement
Consumption reduces, and the yield of nitrogen oxides is also reduced.
Claims (10)
1. a kind of dust granulating process, the technique the following steps are included:
1) ingredient: the various dust that blast furnace and/or sintering process generate are subjected to ingredient, alkalinity regulator is added in ingredient, obtains
To dust ingredient；
2) grinding: the dust ingredient after addition alkalinity regulator is subjected to grinding, the dust ingredient after obtaining grinding；
3) it mixes: the dust ingredient after grinding being mixed, mix dust material is obtained；
4) binder, profit mill, the mix dust material after obtaining profit mill mix grinding: are added in mix dust material；
5) pelletizing: the mix dust material after profit mill is subjected to pelletizing, obtains dust green-ball.
2. a kind of agglomeration for iron mine technique, the technique the following steps are included:
1) ingredient: the various dust that blast furnace and/or sintering process generate are subjected to ingredient, alkalinity regulator is added in ingredient, obtains
To dust ingredient；
2) grinding: the dust ingredient after addition alkalinity regulator is subjected to grinding, the dust ingredient after obtaining grinding；
3) it mixes: the dust ingredient after grinding being mixed, mix dust material is obtained；
4) binder, profit mill, the mix dust material after obtaining profit mill mix grinding: are added in mix dust material；
5) pelletizing: the mix dust material after profit mill is subjected to pelletizing, obtains dust green-ball；
6) it is sintered: dust green-ball obtained in step 5) being added in the blending ore obtained after sinter mixture two mixes, together
It is sintered into sintering machine.
3. technique according to claim 1 or 2, it is characterised in that: the partial size of dust green-ball obtained in step 5) is 8-
16mm, preferably 9-15mm, more preferably 10-14mm；
Preferably, the moisture content of dust green-ball obtained in step 5) be 9-13%, preferably 9.6-12.5%, more preferably
For 10-12%.
4. technique according to any one of claim 1-3, it is characterised in that: blast furnace described in step 1) and/or sintering
The various dust that process generates are the secondary ash of blast furnace, blast furnace discharge yard ash, blast furnace raw material ash, sintering machine tail dedusting ash, sinter into
One of product dedusting ash, sintered material dedusting ash, the main electro-precipitating dust of sintering, steel-making liquid steel refining dedusting ash are a variety of；
Preferably, the secondary ash of blast furnace, blast furnace discharge yard are grey in step 1), blast furnace raw material ash, sintering machine tail dedusting ash, sinter into
Product dedusting ash, the main electro-precipitating dust of sintering, makes steel the weight proportion of liquid steel refining dedusting ash as 8-20:3- at sintered material dedusting ash
15:3-15:30-40:10-25:10-25:0.1-3:0.1-3；Preferably 10-15:5-10:5-10:34-38:15-20:15-
20:0.5-2:0.5-2.
5. technique described in any one of -4 according to claim 1, it is characterised in that: alkalinity regulator described in step 1) is made a living
Lime；Preferably, the additive amount of quick lime is less than 2%, and preferably less than 1%；Preferably, the granularity of quick lime is 0-
5mm, preferably 0.5-3mm.
6. technique according to any one of claims 1-5, it is characterised in that: after alkalinity regulator being added in step 2)
Dust ingredient carry out grinding, the granularity of dust is milled to -200 mesh greater than 70%, preferably greater than 75%, more preferably higher than
80%.
7. technique according to claim 1 to 6, it is characterised in that: the dust ingredient in step 3) after grinding exists
When being mixed, water is added into dust ingredient；Preferably, amount of water is 5-8%, preferably 6-7%；And/or
The time mixed in step 3) is 30-60s, preferably 35-50s.
8. technique described in any one of -7 according to claim 1, it is characterised in that: binder described in step 4) is swelling
Soil；Preferably, bentonite first carries out grinding before mix dust material is added, and bentonitic granularity grinding is big to -325 mesh
In 80%, preferably greater than 90%；Preferably, bentonitic additive amount is 0.5-6%, preferably 1-4%；And/or
The time of mix grinding is 1-15min, preferably 2.5-10min in step 4).
9. technique according to claim 1 to 8, it is characterised in that: the mix dust material in step 5) after profit mill
When carrying out pelletizing, water is added into mix dust material；And/or
The time of pelletizing is 8-16min, preferably 10-15min in step 5).
10. technique according to claim 1 to 9, it is characterised in that: grinding described in step 2) uses high pressure
Roller mill；And/or
Mixing described in step 3) uses intensive mixer, preferably vertical strengthened mixing machine；And/or
Mix grinding described in step 4) uses damp mill.
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Cited By (5)
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| CN112591779A (en) * | 2020-12-10 | 2021-04-02 | 新疆昆玉钢铁有限公司 | Sintering process for recycling waste residues of chemical enterprises |
| CN112941310A (en) * | 2021-01-26 | 2021-06-11 | 山西太钢不锈钢股份有限公司 | Method for improving quality stability of mixed iron material for sintering |
| CN113584302A (en) * | 2021-07-28 | 2021-11-02 | 江阴市创裕机械有限公司 | Continuous granulation process for steel mill fly ash |
| CN115301156A (en) * | 2022-08-30 | 2022-11-08 | 江苏省镔鑫钢铁集团有限公司 | Production process and device for entering sintering ingredients after pretreatment of environmental dedusting ash |
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