CN109161680A - The segregation ore matching sintering method of iron ore - Google Patents
The segregation ore matching sintering method of iron ore Download PDFInfo
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- CN109161680A CN109161680A CN201811163940.7A CN201811163940A CN109161680A CN 109161680 A CN109161680 A CN 109161680A CN 201811163940 A CN201811163940 A CN 201811163940A CN 109161680 A CN109161680 A CN 109161680A
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- ore
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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
Abstract
This application discloses a kind of segregation ore matching sintering method of iron ore, include the following steps: that S1 chooses difference SiO in 2-42The Iron Ore Powder of mass percent forms composite ore, 2-4 kind Iron Ore Powder SiO between any two2The difference of mass percent is 3.0-10.0%；S2 controls SiO in the composite ore2Mass percent is 5.0 ± 0.5%, and controls the 30-50% of rich ore powder when the composite ore quality accounts for step S3 sintering, concentrate powder, auxiliary material and the composite ore gross mass, adjusts the ratio of the 2-4 kind Iron Ore Powder, realizes SiO2Segregation between coarse granule and fine grained；S3 is sintered after mixing with the rich ore powder, concentrate powder, auxiliary material and flux, fuel.The advantage of the invention is that can be improved sinter physical strength, improving sinter grade composition, reduce energy consumption and improve productivity.
Description
Technical field
The present invention relates to iron ore technical field of smelting, in particular to the segregation ore matching sintering method of a kind of iron ore.
Background technique
Sintering is a kind of process of iron mineral powder agglomeration.The main purpose of sintering is by the calcium oxide and iron in flux
Ferriferous oxide and Si oxide in ore, which react, generates liquid phase, and the bulky grain of liquid phase and surrounding does not melt in cooling procedure
Mine bonds, and generating has some strength, and the blocks with excellent metallurgical performance, is sent into blast furnace and is smelted.
Difference of the Iron Ore Powder due to itself silicon content, generation liquid phase different with the calcium oxide respond in flux
Ability and speed it is also different.When Iron Ore Powder has low SiO2Content can promote under conditions of adding CaO content certain outside
The generation and flowing of liquid phase, the Phase in Sinter intensity generated in cooling procedure are also high；Correspondingly, when Iron Ore Powder has height
SiO2When, under conditions of adding CaO content certain outside, a large amount of liquid phase and and easily flowing, but cooling procedure also can be generated
The binder strength of the sinter of middle generation is low, and degree of crushing is big during transportation, and sinter granularity is integrally less than normal.
Correlation analysis statistics indicate that, SiO in Iron Ore Powder2Content is reduced with the increase of particle.General high SiO2The mine of content
Powder Particle Size is smaller, and low SiO2The powder particle size of content is partially thick；When using both types sintering mineral powder simultaneously, due in cloth
The natural segregation of material process, will cause SiO2The high miberal powder of content is thinner, is attached to SiO as adherency powder mostly2Low big of content
Above particle, the sinter consolidation strength that will lead to production in this way is low, and excessive fine ore is generated when broken, causes sinter granularity whole
Body is less than normal, influences blast furnace process.
Summary of the invention
The purpose of the present invention is to provide providing, one kind is reasonably combined to use different SiO2The segregation ore matching of content iron ore
Sintering method.It is sintered by using this method, can be improved sinter physical strength, improve sinter grade composition, reduce energy
Consumption and raising productivity.
To achieve the above object, the present invention provides the following technical solutions.
The embodiment of the present application discloses a kind of segregation ore matching sintering method of iron ore, includes the following steps:
S1 chooses difference SiO in 2-42The Iron Ore Powder of mass percent forms composite ore, and the 2-4 kind Iron Ore Powder is between any two
SiO2The difference of mass percent is 3.0-10.0%；
S2 controls SiO in the composite ore2Mass percent is 5.0 ± 0.5%, and controls the composite ore quality and account for
Rich ore powder when step S3 is sintered, concentrate powder, auxiliary material and the composite ore gross mass 30-50%, adjust the 2-4 kind iron ore
The ratio of powder realizes SiO2Segregation between coarse granule and fine grained；
S3 is sintered after mixing with the rich ore powder, concentrate powder, auxiliary material and flux, fuel.
Preferably, in the segregation ore matching sintering method of above-mentioned iron ore, the fuel is coke powder, and partial size is 1-3mm
Mass percent > 65%.
Preferably, in the segregation ore matching sintering method of above-mentioned iron ore, the auxiliary material is mixing sludge, steel rolling oxygen
Change one of iron sheet.
Preferably, in the segregation ore matching sintering method of above-mentioned iron ore, the coarse granule is high silicon particle, SiO2Matter
Degree > 5.0%, the high silicon particle mass percent > 20% of partial size > 3mm are measured, the fine grained is low silicon
Particle, SiO2Low silicon particle mass percent > 50% described in mass percentage content < 3%, partial size < 1mm.
Preferably, in the segregation ore matching sintering method of above-mentioned iron ore, biodiversity percentage is in the composite ore
7.5 ± 0.5%.
Preferably, in the segregation ore matching sintering method of above-mentioned iron ore, the rich ore grade powder > 55%；The concentrate
The mass percent of powder diameter < 0.074mm is 50-70%, grade > 60%.
The present invention is by by SiO22-4 kind Iron Ore Powder of the content difference in 3-10% carries out size fractionated screening, due to SiO2
Content can increase with the reduction of grade, by reasonably combined, increase the bulky grain iron ore of high silicon content, it is low to control small grade
The iron ore of silicone content can promote reacting for the high silicon mine of bulky grain and surrounding flux, be conducive to the generation and flowing of liquid phase, improve
Sintered bond concrete mutually intensity improves sinter physical strength, improves granularmetric composition, improves productivity, while reducing energy consumption.By
It is relatively low in high silicon mine purchase cost, SiO can be improved using this method2The use ratio of the high bulky grain mine of content, is conducive to
Reduce Iron Ore Matching in Sintering cost.
Specific embodiment
Below by a detailed description of the technical solution in the embodiment of the present invention is provided, it is clear that described embodiment is only
It is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill
Personnel's every other embodiment obtained without making creative work belongs to the model that the present invention protects
It encloses.
The segregation ore matching sintering method of iron ore, includes the following steps:
S1 chooses difference SiO in 2-42The Iron Ore Powder of mass percent forms composite ore, and the 2-4 kind Iron Ore Powder is between any two
SiO2The difference of mass percent is 3.0-10.0%, and biodiversity percentage is 7.5 ± 0.5% in composite ore.
S2 controls SiO in composite ore2Mass percent is 5.0 ± 0.5%, and controls composite ore quality and account for step S3 burning
Rich ore powder when knot, concentrate powder, auxiliary material and composite ore gross mass 30-50%, adjust the ratio of the 2-4 kind Iron Ore Powder, it is real
Existing SiO2Segregation between coarse granule and fine grained, fuel is coke powder, and partial size is the mass percent > 65% of 1-3mm.
Auxiliary material is one of mixing sludge, steel rolling iron scale.Coarse granule is high silicon particle, SiO2Mass percentage content >
The high silicon particle mass percent > 20% of 5.0%, partial size > 3mm, fine grained are low silicon particle, SiO2Mass percentage content
The low silicon particle mass percent > 50% of < 3%, partial size < 1mm.
S3 is sintered after mixing with rich ore powder, concentrate powder, auxiliary material and flux, fuel.Rich ore grade powder > 55%；Concentrate
The mass percent of powder diameter < 0.074mm is 50-70%, grade > 60%.
Less than the small grade of 1mm and part 1-3mm grade Iron Ore Powder as adherency powder, during sintering granulating and bulky grain
Grade is bonded.Due to the iron ore SiO sieved in S12It differs greatly, forms high silicon core, the granulation of low silicon face in S2
Bead and flux firstly generate liquid phase, then bond to unmelted high silicon core ore.When Iron Ore Powder has low SiO2, low Al2O3
When content, under the conditions of identical outer plus CaO, promotes the generation and flowing of liquid phase, improve the consolidation effect of Iron Ore Powder.
Embodiment will be carried out from sintered cup experimental provision below.The present embodiment miberal powder is chosen in 2, and certain 3 kinds or 4 kinds
It is equally applicable.
(1) miberal powder screens
Choose two kinds of dioxide-containing silicas different miberal powder A, B；Wherein A miberal powder TFe mass content 60%, SiO2Quality contains
Amount 10.5%, wherein the grade of > 5mm is 45%；B miberal powder TFe content 64%, SiO2Content 1.9%, wherein the grade of < 1mm is
40%.
(2) ore matching operation
Ore raw materials needed for selection sintering: rich ore powder, concentrate powder, auxiliary material；Rich ore powder is that nature is directly exploited not
Through ore dressing but by the iron ore of simple crushing, grade > 55%；Concentrate powder is nature exploitation by broken, ore grinding, choosing
Mine, granularity are less than the miberal powder that 0.074mm accounts for 50-70%, grade > 60%.
Keep SiO in blending ore2Mass content 5.0%, control miberal powder A, miberal powder B ratio summation be 36%, remaining
Rich ore powder ratio summation is 46%, and concentrate powder ratio is 8%, auxiliary material 10%.
(3) scheme
It maintains confecting polymer water constant, guarantees final sinter SiO2, MgO and R it is constant under conditions of, change miberal powder A, B
Ratio realizes SiO2Segregation between thickness miberal powder.
The following table is granularmetric composition in the composite ore of the embodiment of the present invention and comparative example and granularity SiO2Mass percent
Content:
(4) mixed pelletization
The blending ore for producing reference scheme and embodiment respectively according to ore matching operation and scheme, requires according to sinter basicity
And technique production requirement, supplying lime stone, quick lime, dolomite, fuel, return mine is added mixing machine progress mixing granulation together；
Mixing machine is horizontal two-part mixing machine, is returned mine as granularity < 5mm fine ore after sintering；Lime stone, dolomite are grain after crushing
Degree is less than agstone, the dolomite dust of 3mm amount accounting > 80%；Quick lime is the content of free calcium oxide > 80%, activity degree >
The active quick lime of 200ml.
(5) cloth
By above-mentioned resulting mixture through cloth bucket cloth in sintered cup；Cloth bucket is by motor control, in cloth mistake
360 ° of rotations in journey, cloth, achievees the effect that nature is segregated from the bottom up.
(6) ignition sintering
Well laid material is subjected to igniting down draft sintering；The igniting uses high-purity propane gas.
(7) crushing and screening
By sintered sinter by being crushed, falls, sieve, calculate analysis sintering index.
(8) experimental result is tested twice respectively.
Sintering index is as follows:
The sinter granularmetric composition of different schemes is as follows:
| Scheme | >40mm | 25-40mm | 16-25mm | 10-16mm | 5-10mm | <5mm |
| Comparative example 1 | 6.2% | 19.4% | 21.7% | 10.9% | 18.6% | 23.2% |
| Comparative example 2 | 6.8% | 18.7% | 22.3% | 11.3% | 18.5% | 22.7% |
| Embodiment 1 | 5.1% | 20.4% | 25.7% | 11.9% | 17.3% | 19.7% |
| Embodiment 2 | 4.7% | 19.7% | 26.3% | 11.7% | 17.6% | 20.0% |
Each scheme has carried out effective parallel laboratory test twice, can be seen that by sintering index, in the item for not changing confecting polymer water
Under part, by adjusting SiO2Segregation distribution of the content between size particles, can improve sintering finished rate, tumbler index reduces
Solid burnup improves yield；Carry out SiO2After segregation distribution of the content between size particles, usage factor improves 4.5-
15.6%, yield rate improves 2.3-3.6 percentage points, and tumbler index improves 1.1-2.3 percentage points, and solid burnup reduces
2-4kg/t.
It can be seen that by sinter granularmetric composition, under conditions of not changing confecting polymer water, by adjusting SiO2Content is big
Segregation distribution between little particle, improves the granularmetric composition of sinter, and partial size > 40mm particle reduces 1.7-3.1 hundred
Branch, partial size < 5mm particle reduce 2.7-3.5 percentage points, and size distribution is more uniform.
The present invention is by by different SiO2The rich ore powder of content is sieved, and by adjusting the ratio of size particles, is being protected
Demonstrate,prove blending ore SiO2Under conditions of content is held essentially constant, achieve the purpose that be segregated ore matching, so that high SiO in mixture2's
Core granule is by low SiO2Adherency powder package, promoting liquid phase Binder Phase in sintering process must form and flow, improve sintering
The consolidation strength of mine, yield rate increase, and sinter granularmetric composition is more uniform.Simultaneously because high silicon rich ore powder price compares low silicon
Rich ore powder is low, carries out segregation ore matching using this method and is sintered, can reduce raw materials for sintering cost.
This embodiment is just an exemplary description of this patent and does not limit its protection scope, and those skilled in the art are also
Local change can be carried out to it, as long as it does not exceed the essence of this patent, all be considered as the equivalent replacement to this patent, all
Within the protection scope of this patent.
Claims (6)
1. a kind of segregation ore matching sintering method of iron ore, which comprises the steps of:
S1 chooses difference SiO in 2-42The Iron Ore Powder of mass percent forms composite ore, 2-4 kind Iron Ore Powder SiO between any two2
The difference of mass percent is 3.0-10.0%；
S2 controls SiO in the composite ore2Mass percent is 5.0 ± 0.5%, and controls the composite ore quality and account for step
Rich ore powder when S3 is sintered, concentrate powder, auxiliary material and the composite ore gross mass 30-50%, adjust the 2-4 kind Iron Ore Powder
Ratio realizes SiO2Segregation between coarse granule and fine grained；
S3 is sintered after mixing with the rich ore powder, concentrate powder, auxiliary material and flux, fuel.
2. the segregation ore matching sintering method of iron ore according to claim 1, which is characterized in that the fuel is coke powder,
And partial size is the mass percent > 65% of 1-3mm.
3. the segregation ore matching sintering method of iron ore according to claim 1, which is characterized in that the auxiliary material is mixed
Close one of sludge, steel rolling iron scale.
4. the segregation ore matching sintering method of iron ore according to claim 1, which is characterized in that the coarse granule is height
Silicon particle, SiO2The high silicon particle mass percent > 20% of mass percentage content > 5.0%, partial size > 3mm, it is described
Fine grained is low silicon particle, SiO2Low silicon particle mass percent > described in mass percentage content < 3%, partial size < 1mm
50%.
5. the segregation ore matching sintering method of iron ore according to claim 1, which is characterized in that moisture in the composite ore
Mass percent is 7.5 ± 0.5%.
6. the segregation ore matching sintering method of iron ore according to claim 1, which is characterized in that the rich ore grade powder >
55%；The mass percent of the concentrate powder partial size < 0.074mm is 50-70%, grade > 60%.
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Cited By (1)
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| CN112195337A (en) * | 2020-09-25 | 2021-01-08 | 包头钢铁（集团）有限责任公司 | Sintered ore for improving production quality by controlling grain size of high-silicon flux and preparation method thereof |
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