CN106350667A - Pre-sintered ultra-thick material layer sintering method for reducing small particle size content - Google Patents
Pre-sintered ultra-thick material layer sintering method for reducing small particle size content Download PDFInfo
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- CN106350667A CN106350667A CN201610815325.4A CN201610815325A CN106350667A CN 106350667 A CN106350667 A CN 106350667A CN 201610815325 A CN201610815325 A CN 201610815325A CN 106350667 A CN106350667 A CN 106350667A
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- cloth
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- sintered
- granulation
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- 238000005245 sintering Methods 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 28
- 239000000463 material Substances 0.000 title claims abstract description 25
- 239000002245 particle Substances 0.000 title abstract 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000000203 mixture Substances 0.000 claims abstract description 14
- 229910052742 iron Inorganic materials 0.000 claims abstract description 12
- 238000002156 mixing Methods 0.000 claims abstract description 11
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 9
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000012141 concentrate Substances 0.000 claims abstract description 5
- 238000009818 secondary granulation Methods 0.000 claims abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 4
- 235000012255 calcium oxide Nutrition 0.000 claims abstract description 4
- 239000000292 calcium oxide Substances 0.000 claims abstract description 4
- 238000005469 granulation Methods 0.000 claims abstract description 4
- 230000003179 granulation Effects 0.000 claims abstract description 4
- 239000007921 spray Substances 0.000 claims abstract description 4
- 239000004744 fabric Substances 0.000 claims description 53
- 150000001875 compounds Chemical class 0.000 claims description 13
- 239000004575 stone Substances 0.000 claims description 2
- 238000009826 distribution Methods 0.000 abstract description 5
- 239000000843 powder Substances 0.000 abstract description 5
- 235000019738 Limestone Nutrition 0.000 abstract description 3
- 239000006028 limestone Substances 0.000 abstract description 3
- 238000009736 wetting Methods 0.000 abstract 3
- -1 5-15% of return ores Substances 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 238000000889 atomisation Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000008187 granular material Substances 0.000 description 2
- 229910052595 hematite Inorganic materials 0.000 description 2
- LIKBJVNGSGBSGK-UHFFFAOYSA-N iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Fe+3].[Fe+3] LIKBJVNGSGBSGK-UHFFFAOYSA-N 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000001154 acute effect Effects 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000005453 pelletization Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Classifications
-
- 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
-
- 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
- C22B1/22—Sintering; Agglomerating in other sintering apparatus
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a sintering method of an ultra-thick material layer by adopting pre-sintering, which reduces the content of small particle size, in the pre-sintering process, after iron ore concentrate accounting for 60-80% of the total iron material by weight, 0-20% of iron ore powder, 5-15% of return ores, limestone, quick lime and coke powder are mixed, after primary mixing and secondary granulation, 5-12% of return ores are added, after fully mixing and wetting, third granulation is carried out, wherein wetting is to carry out atomized water spray wetting on the return ores, and the water content of the wet return ores is 7.5-8.0%; and distributing the sintered mixture after the third granulation by a distributor, and respectively feeding the sintered mixture into a first mixed distributor and a second mixed distributor, wherein a material loosening device is arranged during the first distribution, the distribution form is low in the middle and high on two sides, the material loosening device is also arranged during the second distribution, the material surface is smooth after the distribution, the alkalinity of the sintered finished sintered ore is 1.9-2.2, and the ferrous content is 7.0-9.0.
Description
Technical field
The present invention relates to the sintering production method of iron ore, especially relate to one kind and can reduce sintering deposit small grain size rank
The super thick bed of material sintering method of the employing presintering of content.
Background technology
In ironmaking production, the reasonable granularity composition of finished product sintering deposit directly influences the stable smooth operation of blast furnace, is to evaluate
The important technology index of sinter quality.Show in conventional production practices, sintering deposit rate containing powder raises 10%, furnace processor drops
Low 6%-8%, coke ratio raises 0.5%, and therefore intensified-sintered jig divides granulate, reduces the small grain size rank of 5-10mm in sintering deposit
Content, farthest reduce < 5mm powder enter stove content, be to ensure that blast furnace process, stable smooth operation, high yield low burn consumption
Important guarantee.
In at home and abroad about sintering the research of little grain size content and putting into practice, the usual means reducing little grain size content have:
1st, Optimization Ore Matching；2nd, reduce sintering air leak rate of air curtain；3rd, strengthen granulate；4th, process for stabilizing parameter；5th, improve thickness of feed layer.
Wherein improving thickness of feed layer is to reduce the effective ways of little granularity level in finished product ore deposit, but constant in sintering area
Under conditions of, the thickness of feed layer of sintering machine is not unrestrictedly to improve, and it is subject to equipment scale, air exhauster ability, raw strip
Part, the many factors such as sinter quality restrict.Once there are some researches show both at home and abroad, only leaned on the bed of material of simple raising sinter mixture
Thickness, and do not take corresponding technological measure, after thickness of feed layer reaches to a certain degree, the production capacity of sintering machine and quality all can be anxious
Acute decline, loses more than gain.So, current sintering material layer thickness, under taking various technical measures, generally also only exists both at home and abroad
800mm about, and it is sintered into a global metallurgy difficult problem more than the 900mm super thick bed of material, if the concentrate in raw materials for sintering is joined
Relatively higher, more than the thickness of sinter bed or even difficult to reach 750mm.
So the sintering process of novelty this problem could must thoroughly be solved, could effectively improve the yield of sintering deposit
And quality.
Content of the invention
The technical problem to be solved is to reduce the content of 5-10mm small grain size rank in finished product sintering deposit, improves
The production stability of blast furnace, the present invention is separated by the normal part returning sintered material is returned mine, then through big flow,
After the abundant moistening of water spray measure of atomization shape, pelletized entering mixer, can effectively be improved the breathability of the bed of material, no
The little grain size content of only sintering deposit can be significantly reduced, and improves the yield of pre-sintering process further.
The present invention seeks to realized by techniques below scheme:
A kind of reduce little grain size content employing presintering super thick bed of material sintering method it is characterised in that: in presintering
In technique, the iron ore concentrate that total iron charge percentage by weight is 60-80%, the Iron Ore Powder of 0-20% will be accounted for, 5-15% returns mine and stone
After lime stone, quick lime and coke powder carry out dispensing, after mixed once and secondary granulation, add returning mine of 5-12%, through filling
Divide and carry out again after mixing moistening pelletizing for the third time, described moistening carries out to returning mine being atomized shape water spray moistening, returns mine after moistening
Wet weight percentage ratio be 7.5-8.0%；After third time granulation, sinter mixture, through tripper sub-material, respectively enters for the first time
Mixing distributing device and second mixing distributing device, during first time cloth, arrange material-loosing apparatus, cloth form is middle low, and both sides are high,
During second cloth, it is also provided with material-loosing apparatus, after cloth, charge level is smooth, the finished product sinter basicity after sintering is in 1.9-2.2, ferrous
Content is in 7.0-9.0.
Described pre-sintering process is: sintering belt type roasting machine on be configured with first and second mixing distributing device and first,
Post-ignition hood；In blended distributing device cloth sinter mixture for the first time, bed of cloth thickness is in 500mm-900mm, point first
Burn knot, after sintering 8-40min in advance, carry out second cloth sinter mixture in cloth layer surface first, fabric thickness exists
100mm-650mm, sintering suction pressure keeps constant, carries out igniting sintering to second bed of cloth, second bed of cloth completes
During igniting, the compound of bed of cloth is sintered first, first bed of cloth thickness and second bed of cloth thickness sum >=
1000mm, at rear of sintering machine, bed of cloth and second bed of cloth are complete sintering first.
Prove through commerical test, by the reasonable distribution of sinter return fine, partly returned mine abundant moistening and three systems
After grain, returning mine after moistening becomes good balling-up core, and the amount of powder being difficult to balling-up in script compound is wrapped in and returns mine
Periphery, forms new fine grained bead, so that the balling ratio of compound is greatly increased, powder is remarkably decreased.Again by configuring loose metal
Device, when carrying out pre-sintering process production, the cold conditions of the bed of material and hot breathability are obtained for significant raising.Produce result
Show, with the method, not only the little grain size content of sintering deposit is decreased obviously, and yield has obtained further raising, makes pre-
Sintering process has obtained the perfect of progress.
Figure of description
Fig. 1 adopts the super thick bed of material sintering method process chart of presintering for the present invention；
Wherein 1 mixture distributor device a, 2 is lighter a, and 3 is bed of cloth first, and 4 is mixture distributor device b, and 5 is igniting
Device b, 6 is second bed of cloth, and 7 is material-loosing apparatus a, and 8 is material-loosing apparatus b.
Specific embodiment
Illustrate with reference to specific embodiment:
The concrete technology flow process of the present invention such as Fig. 1, when being sintered producing with belt type roasting machine, belt type roasting machine only has
A set of exhausting system, by mixture distributor device 1 cloth compound, carries out loose metal with feed appliance 7 to compound, then passes through igniting
Device 2 is lighted a fire, and after the compound sintering 8-40min of bed of cloth 3 first, then carries out cloth by mixture distributor device 4, uses
Material-loosing apparatus 8 carry out loose metal to compound, are then lighted a fire by lighter 5, continue to be sintered after igniting, at tail,
Bed of cloth 3 and second bed of cloth 6 all complete to sinter first.Specific embodiment is as follows:
Embodiment 1:
1st, when 360 square meter sintering machines are sintered producing using pre-sintering process, will account for total iron charge percentage by weight is
After 60% iron ore concentrate, 20% fine ore, 15% return mine and limestone, quick lime and coke powder carry out dispensing, through once mixing
Close and secondary pelletize after, then be 5% return mine with addition of percentage by weight, this returns mine in advance through atomization water-wet, wet weight
Percentage ratio is 7.5%, finally carries out third time and pelletizes.After three times are pelletized, during first time cloth, through material-loosing apparatus a to mixing
Material carries out loose metal, and after cloth, the form of charge level is middle low, and both sides are high, and bed depth is 600mm.When carrying out second cloth,
Setting material-loosing apparatus b, after cloth, charge level is smooth, and during second cloth, the height of upper strata charge level is 400mm.Finished product after sintering burns
Knot ore deposit, 2.0, ferrous content is 8.2 for basicity.
Under this technique, main produce result such as table 1, in table 1 scheme before taking measures with use the solution of the present invention
For same material condition, but second outer join return mine and be just added in compound in dispensing.
Table 1 produces Comparative result
Known by creation data in table 1, after using the present invention, the size grade ratio of finished product sintering deposit substantially rises,
Content in finished product ore deposit for the little grade is remarkably decreased, and unit-hour output has brought up to 545t/h from 530t/h simultaneously, and yield is entered
The raising of one step.
Embodiment 2:
1st, when 360 square meter sintering machines are sintered producing using pre-sintering process, by the Haematite of percentage by weight 70%
Ore deposit, 10% fine ore, after 10% return mine carries out dispensing, after mixed once and secondary granulation, then with addition of percentage by weight
Returning mine for 10%, this returns mine in advance through atomization water-wet, and wet weight percentage ratio is 7.8%, finally carries out third time and makes
Grain.After three times are pelletized, during first time cloth, through material-loosing apparatus a, loose metal is carried out to compound, during the form of charge level is after cloth
Between low, both sides are high, and bed depth is 700mm.When carrying out second cloth, material-loosing apparatus b is set, and after cloth, charge level is smooth, second
During secondary cloth, the height of upper strata charge level is 300mm.Finished product sintering deposit after sintering, 2.05, ferrous content is 8.5 for basicity.
Under this technique, main produce result such as table 2, in table 2 scheme before taking measures with use the solution of the present invention
For same material condition, but second outer join return mine and be just added in compound in dispensing.
Table 2 produces Comparative result
Known by creation data in table 2, after using the present invention, the size grade ratio of finished product sintering deposit substantially rises,
Content in finished product ore deposit for the little grade is reduced to 32.41% from 38.09%, and unit-hour output brings up to from 525t/h simultaneously
540t/h, yield is further improved.
Embodiment 3:
1st, when 360 square meter sintering machines are sintered producing using pre-sintering process, by the Haematite of percentage by weight 80%
Ore deposit, after 8% return mine carries out dispensing, after mixed once and secondary granulation, then is 12% return mine with addition of percentage by weight,
This returns mine in advance through atomization water-wet, and wet weight percentage ratio is 8.0%, finally carries out third time and pelletizes.Make through three times
After grain, during first time cloth, through material-loosing apparatus a, loose metal is carried out to compound, after cloth, the form of charge level is middle low, and both sides are high,
Bed depth is 600mm.When carrying out second cloth, material-loosing apparatus b is set, and after cloth, charge level is smooth, during second cloth, upper strata
The height of charge level is 500mm.Finished product sintering deposit after sintering, 2.1, ferrous content is 8.7 for basicity.
Under this technique, main produce result such as table 3, in table 3 scheme before taking measures with use the solution of the present invention
For same material condition, but second outer join return mine and be just added in compound in dispensing.
Table 3 produces Comparative result
Known by creation data in table 3, after using the present invention, the size grade ratio of finished product sintering deposit substantially rises,
Content in finished product ore deposit for the little grade drops to 31.48% from 37.50, and unit-hour output has brought up to 540t/ from 520t/h simultaneously
H, yield is further improved.
Claims (2)
1. a kind of reduce little grain size content employing presintering super thick bed of material sintering method it is characterised in that: in presintering work
In skill, the iron ore concentrate that total iron charge percentage by weight is 60-80%, the Iron Ore Powder of 0-20% will be accounted for, 5-15% returns mine and Calx
After stone, quick lime and coke powder carry out dispensing, after mixed once and secondary granulation, add returning mine of 5-12%, through fully
Carry out third time after mixing moistening again to pelletize, described moistening carries out to returning mine being atomized shape water spray moistening, returns mine after moistening
Wet weight percentage ratio is 7.5-8.0%；After third time granulation, sinter mixture, through tripper sub-material, respectively enters mixed for the first time
Close distributing device and second mixing distributing device, during first time cloth, material-loosing apparatus are set, cloth form is middle low, and both sides are high, the
During secondary material distributing, it is also provided with material-loosing apparatus, after cloth, charge level is smooth, in 1.9-2.2, ferrous iron contains the finished product sinter basicity after sintering
Amount is in 7.0-9.0.
2. the super thick bed of material sintering method of a kind of employing presintering reducing little grain size content according to claim 1, its
It is characterised by: described pre-sintering process is: on sintering belt type roasting machine, be configured with first and second mixing distributing device and the
First and second lighter；In for the first time blended distributing device cloth sinter mixture, bed of cloth thickness is in 500mm-900mm first,
Igniting sintering, after sintering 8-40min in advance, carries out second cloth sinter mixture, fabric thickness in cloth layer surface first
In 100mm-650mm, sinter suction pressure and keep constant, igniting sintering is carried out to second bed of cloth, second bed of cloth is complete
When becoming igniting, the compound of bed of cloth is sintered first, first bed of cloth thickness and second bed of cloth thickness sum
>=1000mm, at rear of sintering machine, bed of cloth and second bed of cloth are complete sintering first.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610815325.4A CN106350667B (en) | 2016-09-12 | 2016-09-12 | Pre-sintered ultra-thick material layer sintering method for reducing small particle size content |
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| CN201610815325.4A CN106350667B (en) | 2016-09-12 | 2016-09-12 | Pre-sintered ultra-thick material layer sintering method for reducing small particle size content |
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| CN106350667A true CN106350667A (en) | 2017-01-25 |
| CN106350667B CN106350667B (en) | 2018-12-04 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108507354A (en) * | 2018-04-13 | 2018-09-07 | 湖南理工学院 | Realize the controllable sintering system of granularity and distribution device of mixture and coke powder segmentation |
| CN111041195A (en) * | 2020-01-03 | 2020-04-21 | 中南大学 | Strong mixing-granulating method for strengthening sintering of high-proportion micro-fine particle raw materials |
| CN112414139A (en) * | 2019-09-03 | 2021-02-26 | 中冶长天国际工程有限责任公司 | Layered segregation distributing device and distributing method for composite sintering mixture |
| CN115505728A (en) * | 2022-09-26 | 2022-12-23 | 鞍钢股份有限公司 | Sintering method using coking fly ash as main sintering fuel of super-thick material layer |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108507354A (en) * | 2018-04-13 | 2018-09-07 | 湖南理工学院 | Realize the controllable sintering system of granularity and distribution device of mixture and coke powder segmentation |
| CN112414139A (en) * | 2019-09-03 | 2021-02-26 | 中冶长天国际工程有限责任公司 | Layered segregation distributing device and distributing method for composite sintering mixture |
| CN112414139B (en) * | 2019-09-03 | 2022-04-12 | 中冶长天国际工程有限责任公司 | Layered segregation distributing device and distributing method for composite sintering mixture |
| CN111041195A (en) * | 2020-01-03 | 2020-04-21 | 中南大学 | Strong mixing-granulating method for strengthening sintering of high-proportion micro-fine particle raw materials |
| CN111041195B (en) * | 2020-01-03 | 2021-01-29 | 中南大学 | Strong mixing-granulating method for strengthening sintering of high-proportion micro-fine particle raw materials |
| CN115505728A (en) * | 2022-09-26 | 2022-12-23 | 鞍钢股份有限公司 | Sintering method using coking fly ash as main sintering fuel of super-thick material layer |
| CN115505728B (en) * | 2022-09-26 | 2023-10-20 | 鞍钢股份有限公司 | Sintering method using coking dust as main fuel for sintering super-thick material layer |
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