CN109423555A - A kind of iron ore high-efficiency sintered method using low-silicon iron fine powder - Google Patents
A kind of iron ore high-efficiency sintered method using low-silicon iron fine powder Download PDFInfo
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- CN109423555A CN109423555A CN201710729186.8A CN201710729186A CN109423555A CN 109423555 A CN109423555 A CN 109423555A CN 201710729186 A CN201710729186 A CN 201710729186A CN 109423555 A CN109423555 A CN 109423555A
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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
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/008—Composition or distribution of the charge
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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
Abstract
A kind of iron ore high-efficiency sintered method using low-silicon iron fine powder proposed by the present invention, it is returned mine by being made low-silicon iron fine powder granulation bead with big granularity as core, with Iron concentrate, particulate flux, particulate coke powder for interior adhesion layer, it is returned mine with particulate as the special construction of outer adhesion layer, it is difficult to pelletize to solve Iron concentrate granulation property difference, high temperature sintering performance difference is difficult to the technical problem of mineralising, while part coarseness coke powder and coarseness lime stone flux is additional.The invention enables sinter quality indexs to be optimised, raw material mix under the same conditions, compared with normal sintering process, productivity of sintering machine improve 1.6-4.7t/m2D, sintering finished rate improve 0.8-1.5%, and sintered ore rotary drum strength improves 1.6-2.4%.
Description
Technical field
The present invention relates to Ferrous Metallurgy SINTERING TECHNOLOGY fields, and in particular to a kind of iron ore using low-silicon iron fine powder
High-efficiency sintered method.
Background technique
Sinter is the most important iron-containing charge of blast furnace, and sinter accounting is 75- in Bf Burden under normal conditions
78% or so.It is influenced by iron ore powder ore resources in poor quality in recent years, sintering fine ore middle arteries stone content is constantly improve, such as Brazil
Southern fine ore, SiO in ore2Content rises year by year from 4% or so to occurring on 6-7% or so or even Iron Ore Market
SiO2The ultra high silicon fine ore product of up to 10-12%.In conjunction with Fig. 1 conventional sintering process process, normal sintering mine by blending ore, return
Through mixed once, secondary mixing, cloth, igniting, sintering, cold after mine, flux (quick lime, lime stone, dolomite), coke powder ingredient
But, whole grain obtains finished product sinter.In order to ensure the requirement of blast furnace low slag melting, high PCI rate, blast furnace feeding grade cannot drop
Low, in order to reconcile the contradiction between iron ore resource in poor quality and high feed grade, the technical cue used in production usually has:
1. improving high-grade pelletizing ratio in Bf Burden；Or 2. improve the low SiO of high-grade in Iron Ore Matching in Sintering structure2Fine powder ratio
Example.Although above-mentioned technical cue can mitigate the lance between high-quality iron ore resource exhaustion and high feed grade to a certain extent
Shield, but influenced by the factors such as itself property of raw material and operating condition, there is also technical restrictions.Blast furnace ore matching is mostly used pelletizing
The restriction of mine is: in general pelletizing high-temperature behavior is not so good as high basicity sinter, melt initiation temperature degree TsWith drippage temperature TdPartially
It is low, cause blast furnace melting with soft to move up tendency；Pelletizing low temperature reduction degradation is also easy to produce fine powder, has negative shadow to blast furnace permeability
It rings；Pelletizing is easier to roll in cloth process, influences upper blast furnace adjustment effect etc., therefore multi-purpose pellet blast furnace operating is difficult
Degree increases.The restriction that Iron Ore Matching in Sintering is mostly used Iron concentrate is: Iron concentrate fine size, and permeability of sintering material bed reduces, and is sintered negative pressure
It increases, bed of material transverse instability increases；On the other hand, the assimilation temperature of usual Iron concentrate is higher, assimilation temperature refer to fine powder with
The minimum response temperature of CaO flux is not easy to sinter mine into, therefore being sintered multi-purpose Iron concentrate causes sintering operation difficulty to increase, and burns
Tying mineral products amount reduces.
Chinese patent application CN200610031431.X, a kind of preprocessing and reinforced sintering method for iron charge are directed to Iron concentrate
The feature of granulation property difference discloses one kind by high pressure roller mill or the pretreated method of damp mill, improves the table of specular hematite concentrate
Feelings activity and show hydrophily, improve its pellet performance, to improve permeability of sintering material bed, reaches the mesh for improving sintering output
's.Chinese patent application CN201310255070.7, the intensified-sintered method of granule iron concentrate pre-molding, equally for iron essence
Powder difficulty granulation characteristic, disclose it is a kind of by Iron concentrate by high pressure roller molding machine pre-molding be cylindrical body material grain, then
With other raw material mixing granulations, this method makes difficult granulation material force molding, improves sinter mixture granularity composition, improve
Permeability of sintering material bed, so that sinter quality is optimised.The spy that the above patent application is pelletized mainly for Iron concentrate difficulty
Sign using pretreatment mode, such as using high pressure roller mill or profit mill or high pressure roll-type forming mode, improves its pellet performance,
So as to improve permeability of sintering material bed, achieve the purpose that optimization sintering quality.
Chinese patent application CN01114546.3, process for preparing high iron low silicon agglomerate disclose a kind of first by low-silicon iron
Fine powder, particulate iron-bearing auxiliary material and fine granularity flux (lime stone or quick lime) are mixed and made into the adhered particles that basicity is 1.8-6.0,
Then with big granularity Iron Ore Powder and return mine into nuclear particle and mix, pelletize that (or low-silicon iron fine powder, particulate iron-bearing auxiliary material and fine granularity are molten
Agent mixing, by disk pelletizing and or pelletising drum granulation, then with big granularity Iron Ore Powder and return mine into nuclear particle and mix, make
Grain) sintering process.Chinese patent application CN201310417934.0, a method of strengthening iron ore concentrate sintered at high proportion, public affairs
It has opened a kind of first iron ore concentrate, quick lime and coke powder are added in drum pelletizer or disc balling machine and has carried out first segment granulation, and
The bead made is added to the sintering process pelletized in drum pelletizer together with other raw materials afterwards.The characteristics of above patent application
It is that the Iron concentrate first by hardly possible granulation mixes (or further granulation) with quick lime flux, by the hydrogen generated after quicklime slaking
Calcium oxide colloid strengthens the pellet performance of Iron concentrate, then or directly mixes, pelletizes with other raw materials；Or Iron concentrate is individually pelletized
It at bead, then mixes with other raw materials, pelletize, achieve the purpose that intensified-sintered quality.
Summary of the invention
(1) the technical issues of solving
The invention proposes a kind of iron ore high-efficiency sintered method using low-silicon iron fine powder, solve to use iron in high proportion
Under the conditions of fine powder sintering process deteriorate, sinter quality reduce the problem of, for optimization Bf Burden, reduce molten iron at
The effective technological means of this offer.
(2) technical solution
In order to achieve the above object, the present invention is achieved by the following technical programs:
A kind of iron ore high-efficiency sintered method using low-silicon iron fine powder, comprising the following steps:
S1, choose iron-bearing material, return mine, dolomite dust, coke powder, agstone, quick lime are as sinter mixture, described
Iron-bearing material is Iron concentrate, blending ore, and the Iron concentrate accounts for sinter mixture mass parts ratio and is not higher than 25%, the Iron concentrate
Blending ore ratio is accounted for not higher than 40%；Described return mine accounts for sinter mixture mass parts ratio as 25%-30%；The dolomite dust
Accounting for sinter mixture mass parts ratio is 3-5%；It is 2-5% that the coke powder, which accounts for sinter mixture mass parts ratio,；The lime
It is 2-4% that mountain flour, which accounts for sinter mixture mass parts ratio,；It is 3-5% that the quick lime, which accounts for sinter mixture mass parts ratio,；
S2, it is described return mine including agglomerated powder, agglomerated powder is lower part of screen after finished product sinter is sieved before blast furnace feeding point,
Granularity is less than 5mm, will return mine and is divided into A, B two parts, and part A is passed through screening system, is sieved into greater than 1mm grade and is less than
1mm grade two parts, and part B and coke powder, agstone, quick lime, dolomite dust enter cylinder mixing together with blending ore
Granulator；
S3, coke powder is divided into A, B two parts, part A is passed through into screening system, is sieved into less than 0.5mm grade and is greater than
0.5mm grade two parts, and part B and return mine, agstone, quick lime, dolomite dust it is mixed into cylinder together with blending ore
Close granulator；
S4, agstone is divided into A, B two parts, part A is passed through into screening system, be sieved into less than 0.5mm grade and
Greater than 0.5mm grade two parts, and part B and return mine, coke powder, quick lime, dolomite dust it is mixed into cylinder together with blending ore
Close granulator；
S5, quick lime is divided into A, B two parts, part A is taken out, and part B and return mine, coke powder, agstone, white clouds
Mountain flour enters Mixingand granulating drum together with blending ore；
S6, by whole dolomite dusts and return mine, coke powder, agstone, dolomite dust mix together with blending ore into cylinder
Close granulator；
S7, it is less than after 0.5mm grade part, the screening of part A agstone being less than after Iron concentrate, the screening of part A coke powder
Intensive mixer is added in 0.5mm grade part, part A quick lime, and adds water to soak material in blending process, and strength mixes
The moisture that material is discharged in machine is 2-4%, incorporation time 1-3min；
Being greater than 1mm grade part after S8, screening that part A is returned mine adds water to pre-wet, and amount of water control is in material moisture
3-5%；
S9, the material that will be discharged from intensive mixer return mine and add together from feed end with the 1mm grade that is greater than after pre-wetting
Enter drum pelletizer, part A is returned mine and is less than 1mm grade part after sieving from discharge end addition drum pelletizer, coal addition position
Account for entire drum pelletizer length for material drop point to discharge end distance 1/3；
S10, by part B agglomerated powder, part B coke powder, part B agstone, part B quick lime, dolomite dust and mixing
Mixingand granulating drum is added from feed end together in mine, will be greater than after the material being discharged from drum pelletizer, the screening of part A coke powder
It is greater than 0.5mm grade part together from Mixingand granulating drum discharge end after 0.5mm grade part, the screening of part A agstone
It is added, coal addition position accounts for the 1/3 of entire Mixingand granulating drum length to discharge end distance for material drop point；
S11, the material that will be discharged from Mixingand granulating drum sequentially enter cloth, igniting, sintering, cooling, whole grain stream
Journey obtains finished product sinter, uses for blast furnace.
Further, Iron concentrate is low-silicon iron fine powder, SiO in low-silicon iron fine powder in the step S12Mass percentage
Lower than 3%.
Further, in the step S1 in blending ore comprising Iron Ore Powder, pelletizing and lump ore minus sieve, iron-bearing auxiliary material, but
It does not include Iron concentrate.
Further, the ratio that part A of returning mine in the step S2 and part B account for sinter mixture is denoted as PA respectivelyRFWith
PBRF, PARFCalculation formula bePBRFIt accounts for the ratio of sinter mixture all to return mine and subtracts PARF, public
In formula: m (%) is the ratio that Iron concentrate accounts for sinter mixture, and value range is not higher than 25%；N is proportionality coefficient, value range
For 0.7-1.3；A (%) is the ratio for being greater than 1mm grade in returning mine；Proportionality coefficient n is determined by m value in formula, and the function of the two closes
System are as follows: n (m)=- 0.024m+1.35.
Further, the ratio that coke powder part A and part B account for sinter mixture in the step S3 is denoted as PA respectivelyCWith
PBC, PACCalculation formula are as follows: PAC=0.08m+0.6；PBCThe ratio for accounting for sinter mixture for whole coke powders subtracts PAC；Formula
In: m (%) is the ratio that Iron concentrate accounts for sinter mixture, and value range is not higher than 25%.
Further, the ratio that agstone part A and part B account for sinter mixture in the step S4 is denoted as respectively
PASAnd PBS, PASCalculation formula are as follows: PAS=0.05m+0.8；PBSThe ratio for accounting for sinter mixture for whole agstones subtracts
PAS；In formula: m (%) is the ratio that Iron concentrate accounts for sinter mixture, and value range is not higher than 25%.
Further, the ratio that quick lime part A and part B account for sinter mixture in the step S5 is denoted as PA respectivelyL
And PBL, PALCalculation formula are as follows: PAL=0.125m+0.15；PBLThe ratio for accounting for sinter mixture for whole quick limes subtracts
PAL；In formula: m (%) is the ratio that Iron concentrate accounts for sinter mixture, and value range is not higher than 25%.
Further, in the step S9, water, drum pelletizer discharge are supplemented into drum pelletizer in operation
Material moisture is 4-6%, Granulation time 3-8min.
Further, in the step S10, add water into Mixingand granulating drum in operation, mixed from cylinder
It is 6-8% that material moisture, which is discharged, in granulator, and the mixing granulation time is 6-10min.
(3) beneficial effect
Beneficial effects of the present invention: a kind of iron ore high-efficiency sintered method using low-silicon iron fine powder pelletizes Iron concentrate
Bead, which is made, is returned mine with big granularity as core, with Iron concentrate, particulate flux, particulate coke powder for interior adhesion layer, with particulate return mine for
The special construction of outer adhesion layer, to solve, Iron concentrate granulation property difference is difficult to pelletize, high temperature sintering performance difference is difficult to mineralising
Technical problem；It is simultaneously that part coarseness coke powder and coarseness lime stone flux is additional, pass through above technological means, sinter
Quality index is optimised, raw material mix under the same conditions, compared with normal sintering process, productivity of sintering machine
Improve 1.6-4.7t/m2D, sintering finished rate improve 0.8-1.5%, and sintered ore rotary drum strength improves 1.6-2.4%.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is existing normal sintering flow chart；
Fig. 2 is the method for the present invention flow chart；
Fig. 3 is Iron concentrate granulation bead structural schematic diagram；
Fig. 4 is the granulation bead micro-structure diagram returned mine and make core particle；
Fig. 5 is the productivity comparison of test results curve graph of the present invention with normal sintering；
Fig. 6 is the yield rate comparison of test results curve graph of the present invention with normal sintering；
Fig. 7 is the drum strength comparison of test results curve graph of the present invention with normal sintering.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without creative efforts, shall fall within the protection scope of the present invention.
In conjunction with Fig. 2, a kind of iron ore high-efficiency sintered method using low-silicon iron fine powder, comprising the following steps:
S1, choose iron-bearing material, return mine, dolomite dust, coke powder, agstone, quick lime are as sinter mixture, iron content
Raw material is Iron concentrate, blending ore, and Iron concentrate accounts for sinter mixture mass parts ratio not higher than 25%, and Iron concentrate accounts for blending ore ratio
Not higher than 40%；Returning mine and accounting for sinter mixture mass parts ratio is 25%-30%；Dolomite dust accounts for sinter mixture mass parts ratio
Example is 3-5%；It is 2-5% that coke powder, which accounts for sinter mixture mass parts ratio,；Agstone accounts for sinter mixture mass parts ratio
2-4%；It is 3-5% that quick lime, which accounts for sinter mixture mass parts ratio,；Iron concentrate is low-silicon iron fine powder, SiO in low-silicon iron fine powder2
Mass percentage is lower than 3%；It comprising Iron Ore Powder, pelletizing and lump ore minus sieve, iron-bearing auxiliary material in blending ore, but does not include iron essence
Powder；
S2, it returns mine including agglomerated powder, agglomerated powder is the lower part of screen point after finished product sinter is sieved before blast furnace feeding, also referred to as
It returns mine outside making, granularity is less than 5mm, will return mine and is divided into A, B two parts, and part A is passed through screening system, is sieved into greater than 1mm
Grade and it is less than 1mm grade two parts, and part B and coke powder, agstone, quick lime, dolomite dust enter together with blending ore
Mixingand granulating drum；
The ratio that part A of returning mine and part B account for sinter mixture is denoted as PA respectivelyRFAnd PBRF, PARFCalculation formula bePBRFIt accounts for the ratio of sinter mixture all to return mine and subtracts PARF, in formula: m (%) is Iron concentrate
The ratio of sinter mixture is accounted for, value range is not higher than 25%；N is proportionality coefficient, value range 0.7-1.3；A (%) is to return
It is greater than the ratio of 1mm grade in mine, usually 70% or so；Proportionality coefficient n is determined by m value in formula, the functional relation of the two are as follows:
N (m)=- 0.024m+1.35；
S3, coke powder is divided into A, B two parts, part A is passed through into screening system, is sieved into less than 0.5mm grade and is greater than
0.5mm grade two parts, and part B and return mine, agstone, quick lime, dolomite dust it is mixed into cylinder together with blending ore
Close granulator；
The ratio that coke powder part A and part B account for sinter mixture is denoted as PA respectivelyCAnd PBC, PACCalculation formula are as follows: PAC
=0.08m+0.6；PBCThe ratio for accounting for sinter mixture for whole coke powders subtracts PAC；In formula: m (%) is that Iron concentrate accounts for sintering
The ratio of mixture, value range are not higher than 25%；
S4, agstone is divided into A, B two parts, part A is passed through into screening system, be sieved into less than 0.5mm grade and
Greater than 0.5mm grade two parts, and part B and return mine, coke powder, quick lime, dolomite dust it is mixed into cylinder together with blending ore
Close granulator；
The ratio that agstone part A and part B account for sinter mixture is denoted as PA respectivelySAnd PBS, PASCalculation formula
Are as follows: PAS=0.05m+0.8；PBSThe ratio for accounting for sinter mixture for whole agstones subtracts PAS；In formula: m (%) is iron
Fine powder accounts for the ratio of sinter mixture, and value range is not higher than 25%；
S5, quick lime is divided into A, B two parts, part A is taken out, and part B and return mine, coke powder, agstone, white clouds
Mountain flour enters Mixingand granulating drum together with blending ore；
The ratio that quick lime part A and part B account for sinter mixture is denoted as PA respectivelyLAnd PBL, PALCalculation formula are as follows:
PAL=0.125m+0.15；PBLThe ratio for accounting for sinter mixture for whole quick limes subtracts PAL；In formula: m (%) is Iron concentrate
The ratio of sinter mixture is accounted for, value range is not higher than 25%；
S6, by whole dolomite dusts and return mine, coke powder, agstone, dolomite dust mix together with blending ore into cylinder
Close granulator；
S7, it is less than after 0.5mm grade part, the screening of part A agstone being less than after Iron concentrate, the screening of part A coke powder
Intensive mixer is added in 0.5mm grade part, part A quick lime, and adds water to soak material in blending process, and strength mixes
The moisture that material is discharged in machine is 2-4%, incorporation time 1-3min；
Being greater than 1mm grade part after S8, screening that part A is returned mine adds water to pre-wet, and amount of water control is in material moisture
3-5%；
S9, the material that will be discharged from intensive mixer return mine and add together from feed end with the 1mm grade that is greater than after pre-wetting
Enter drum pelletizer, part A is returned mine and is less than 1mm grade part after sieving from discharge end addition drum pelletizer, coal addition position
Account for entire drum pelletizer length for material drop point to discharge end distance 1/3；It is mended in operation into drum pelletizer
Water-filling, it is 4-6%, Granulation time 3-8min that material moisture, which is discharged, in drum pelletizer；
S10, by part B agglomerated powder, part B coke powder, part B agstone, part B quick lime, dolomite dust and mixing
Mixingand granulating drum is added from feed end together in mine, will be greater than after the material being discharged from drum pelletizer, the screening of part A coke powder
It is greater than 0.5mm grade part together from Mixingand granulating drum discharge end after 0.5mm grade part, the screening of part A agstone
It is added, coal addition position accounts for the 1/3 of entire Mixingand granulating drum length to discharge end distance for material drop point；In operation
Add water into Mixingand granulating drum, be 6-8% from Mixingand granulating drum discharge material moisture, the mixing granulation time is 6-
10min；
S11, the material that will be discharged from Mixingand granulating drum sequentially enter cloth, igniting, sintering, cooling, whole grain stream
Journey obtains finished product sinter, uses for blast furnace.
The use difficult point major embodiment of Iron concentrate is both ways: on the one hand, granulation property difference is difficult to pelletize；On the other hand, high
Warm sintering character difference is difficult to mineralising.
For the technological difficulties of Iron concentrate pellet performance difference, the present invention by Iron concentrate and quick lime in intensive mixer
Mixing, in mixed process plus water soaks, so that quick lime is uniformly distributed in Iron concentrate, while quick lime starts digestion and generates
Ca(OH)2Colloid plays the role of strengthening Iron concentrate granulation.Furthermore it will be greater than the granulation of 1mm grade returned mine as Iron concentrate
Core particle, and strengthen the important measures of Iron concentrate granulating efficiency.Particle surface of returning mine is irregular, and is in porous structure, holds
Easily adherency fine powder is highly suitable as granulation core particle, makees granulation bead microstructure such as Fig. 4 institute of core particle by returning mine
Show, and be greater than 1mm grade and return mine with before Iron concentrate mixing granulation, pre-wetted, further strengthens and return mine as granulation core
The ability of heart particle adherency Iron concentrate.
It is difficult to mineralising for Iron concentrate high temperature sintering performance difference, in the present invention, firstly, by Iron concentrate and less than 0.5mm
Grade agstone and quick lime are together as adhered particles (further including being less than 0.5mm grade coke powder in adhered particles), so that viscous
CaO content is higher in attached particle, to strengthen the high temperature sintering performance of Iron concentrate.Specifically, CaO and Fe in adhered particles2O3's
Ratio coincidence formula:I.e. CaO accounts for CaO and Fe2O3The ratio of summation be 11-18% it
Between；wCaO(%) is CaO content in adhered particles；wFe2O3(%) is Fe in adhered particles2O3Content；Secondly, to be greater than 1mm
The particle of returning mine of grade facilitates the mineralization process of Iron concentrate, reason is the mine returned mine as Iron concentrate granulation core particle
Object composition includes mainly calcium ferrite, bloodstone, magnetic iron ore and glass phase etc., and wherein calcium ferrite is decomposed at 1250-1300 DEG C
Liquid phase and bloodstone, and glass phase is changed into liquid phase at 1300 DEG C or so, both above liquid phase formed during the sintering process will
Accelerate the mineralization process of Iron concentrate；Again, the fine powder of returning mine for being less than 1mm grade is adhered to the small ectosphere of Iron concentrate granulation, made
Iron concentrate granulation bead has to be greater than 1mm and returns mine particle as core, with Iron concentrate, less than 0.5mm grade agstone,
It is interior adhesion layer less than 0.5mm grade coke powder, quick lime, it is special to be less than the 0.5mm grade structure that fine powder is outer adhesion layer of returning mine
Point, structural schematic diagram are as shown in Figure 3.The Iron concentrate granulation bead being discharged from drum pelletizer is being added in cylinder mixing granulation
In machine blanking and mixed process, due to the presence of adhesion layer outside granulation bead, by the interior adherency of Iron concentrate and flux, fuel mix
Layer is effectively protected under by external impacts, it is ensured that the integrality of the interior adhesion layer of Iron concentrate and CaO flux composition, thus
It ensure that invigoration effect of the CaO flux to Iron concentrate mineralization process.Since fine powder of returning mine is with good pellet performance, Cong Tiejing
The fine powder of returning mine to fall off on powder granulation bead will be adhered to easier on other granulation beads, ventilative to the bed of material will not mutually be brought
Negative effect；Finally, being less than 0.5mm grade coke powder in interior adhesion layer, on the one hand itself and Iron concentrate, CaO flux are in close contact, separately
On the one hand its fine size, burn rate is fast, and the heat generated during the sintering process will be utilized more effectively by Iron concentrate and flux, from
And play the role of strengthening Iron concentrate mineralising.In addition it is greater than after being greater than 0.5mm grade part, lime stone screening after coke powder being sieved
0.5mm grade part from Mixingand granulating drum discharge end be added so that this part coke powder and agstone be distributed in granulation it is small
The outside of ball facilitates outside granulation bead to form abundant liquid phase, to effectively improve sinter strength.
When accounting for sinter mixture ratio with Iron concentrate dosage and being respectively 5%, 10%, 15%, 20%, be specifically described with it is conventional
Sintering process is compared, the advantage for the sintering method that present patent application proposes.In the specific implementation process, it matches and increases with Iron concentrate
Add, passes through blending ore confecting polymer water (the low silicon fine powder of high-grade substitutes high silicon powder mine) and flux dosage (agstone dolomite dust)
Adjustment, keep sinter in SiO2Content, content of MgO and basicity remain unchanged, and Al2O3Content decreases, Quan Tie T.Fe
Content is increased.The ingredient of the low-silicon iron fine powder of use and high silicon powder mine is as shown in table 1.
1 low-silicon iron fine powder of table and high silicon powder mine ingredient (mass%)
Embodiment one: it is 5% that Iron concentrate dosage, which accounts for sinter mixture ratio,
Iron concentrate dosage account for sinter mixture ratio be 5% when, material is allocated according to the above technical scheme, is handled.
Calculating is returned mine part A ratio PARFIt is 8.8%, coke powder part A ratio PACIt is 1%, lime stone part A ratio PASIt is 1.1%,
Quick lime part A ratio PALIt is 0.8%, CaO accounts for CaO and Fe in adhered particles2O3Total amount is 15.7%.
Raw material is 1min in the mixing time of intensive mixer, and drum pelletizer Granulation time is 4min, cylinder mixing system
The grain machine mixing granulation time is 8.5min, and obtained Sinter Component is as shown in table 2, and sintering index is as shown in table 3.Make simultaneously
With under identical raw material and the experimental condition of proportion, using conventional sintering process, the test result of acquirement is also together in table 3
In list.As seen from the experiment, compared with old process, techniqueflow of the invention has some superiority.
The Sinter Component of 2 Iron concentrate dosage 5% of table
The sintering index of 3 Iron concentrate dosage 5% of table
Embodiment two: it is 10% that Iron concentrate dosage, which accounts for sinter mixture ratio,
Iron concentrate dosage account for sinter mixture ratio be 10% when, material is allocated according to the above technical scheme, is handled.
Calculating is returned mine part A ratio PARFIt is 15.9%, coke powder part A ratio PACIt is 1.4%, lime stone part A ratio PASFor
1.3%, quick lime part A ratio PALIt is 1.4%, CaO accounts for CaO and Fe in adhered particles2O3Total amount is 13.2%.
Raw material is 1.3min in the mixing time of intensive mixer, and drum pelletizer Granulation time is 5min, cylinder mixing
The granulator mixing granulation time is 8min, and obtained Sinter Component is as shown in table 4, and sintering index is as shown in table 5.Make simultaneously
With under identical raw material and the experimental condition of proportion, using conventional sintering process, the test result of acquirement is also together in table 5
In list.As seen from the experiment, compared with old process, techniqueflow of the invention has greater advantage.
The Sinter Component of 4 Iron concentrate dosage 10% of table
The sintering index of 5 Iron concentrate dosage 10% of table
Embodiment three: it is 15% that Iron concentrate dosage, which accounts for sinter mixture ratio,
Iron concentrate dosage account for sinter mixture ratio be 15% when, material is allocated according to the above technical scheme, is handled.
Calculating is returned mine part A ratio PARFIt is 21.2%, coke powder part A ratio PACIt is 1.8%, lime stone part A ratio PASFor
1.6%, quick lime part A ratio PALIt is 2.0%, it is 12.3% that CaO, which accounts for CaO and Fe2O3 total amount, in adhered particles.
Raw material is 1.6min in the mixing time of intensive mixer, and drum pelletizer Granulation time is 6min, cylinder mixing
The granulator mixing granulation time is 7.5min, and obtained Sinter Component is as shown in table 6, and sintering index is as shown in table 7.Exist simultaneously
Using under identical raw material and the experimental condition of proportion, using conventional sintering process, the test result of acquirement also exists together
It is listed in table 7.As seen from the experiment, compared with old process, techniqueflow of the invention has greater advantage.
The Sinter Component of 6 Iron concentrate dosage 15% of table
The sintering index of 7 Iron concentrate dosage 15% of table
Example IV: it is 20% that Iron concentrate dosage, which accounts for sinter mixture ratio,
Iron concentrate dosage account for sinter mixture ratio be 20% when, material is allocated according to the above technical scheme, is handled.
Calculating is returned mine part A ratio PARFIt is 24.9%, coke powder part A ratio PACIt is 2.2%, lime stone part A ratio PASFor
1.8%, quick lime part A ratio PALIt is 2.7%, CaO accounts for CaO and Fe in adhered particles2O3Total amount is 11.8%.
Raw material is 2min in the mixing time of intensive mixer, and drum pelletizer Granulation time is 7min, cylinder mixing system
The grain machine mixing granulation time is 7min, and obtained Sinter Component is as shown in table 8, and sintering index is as shown in table 9.It is using simultaneously
Under identical raw material and the experimental condition of proportion, using conventional sintering process, the test result of acquirement is also together in table 9
It lists.As seen from the experiment, compared with old process, techniqueflow of the invention has some superiority.
The Sinter Component of 8 Iron concentrate dosage 20% of table
The sintering index of 9 Iron concentrate dosage 20% of table
Fig. 5, Fig. 6, Fig. 7 give the productivity comparison of test results curve graph of the present invention and normal sintering, yield rate is tried
Test Comparative result curve graph, drum strength comparison of test results curve graph.
In conclusion the present invention is returned mine by being made low-silicon iron fine powder granulation bead with big granularity as core, with iron essence
Powder, particulate flux, particulate coke powder are that (CaO accounts for CaO and Fe to interior adhesion layer in interior adhesion layer2O3The 11-18% of total amount), with particulate
It returns mine as the special construction of outer adhesion layer, to solve, Iron concentrate granulation property difference is difficult to pelletize, high temperature sintering performance difference is difficult to
The technical problem of mineralising, at the same by part coarseness coke powder and coarseness lime stone flux it is additional (i.e. be distributed in granulation bead outside
Portion).By above technological means, sinter quality index is optimised, raw material mix under the same conditions, and it is normal
Rule sintering process is compared, and productivity of sintering machine improves 1.6-4.7t/m2D, sintering finished rate improve 0.8-1.5%, sintering
Mine drum strength improves 1.6-2.4%.
The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although with reference to the foregoing embodiments
Invention is explained in detail, those skilled in the art should understand that: it still can be to aforementioned each implementation
Technical solution documented by example is modified or equivalent replacement of some of the technical features；And these modification or
Replacement, the spirit and scope for technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution.
Claims (9)
1. a kind of iron ore high-efficiency sintered method using low-silicon iron fine powder, which comprises the following steps:
S1, choose iron-bearing material, return mine, dolomite dust, coke powder, agstone, quick lime are as sinter mixture, the iron content
Raw material is Iron concentrate, blending ore, and the Iron concentrate accounts for sinter mixture mass parts ratio not higher than 25%, and the Iron concentrate accounts for mixed
Even mine ratio is not higher than 40%；Described return mine accounts for sinter mixture mass parts ratio as 25%-30%；The dolomite dust accounts for burning
Knot mixture quality part ratio is 3-5%；It is 2-5% that the coke powder, which accounts for sinter mixture mass parts ratio,；The agstone
Accounting for sinter mixture mass parts ratio is 2-4%；It is 3-5% that the quick lime, which accounts for sinter mixture mass parts ratio,；
S2, it is described return mine including agglomerated powder, agglomerated powder is lower part of screen after finished product sinter is sieved before blast furnace feeding point, granularity
Less than 5mm, it will return mine and be divided into A, B two parts, part A is passed through into screening system, be sieved into greater than 1mm grade and less than 1mm
Grade two parts, and part B and coke powder, agstone, quick lime, dolomite dust enter cylinder mixing granulation together with blending ore
Machine；
S3, coke powder is divided into A, B two parts, part A is passed through into screening system, be sieved into less than 0.5mm grade and be greater than 0.5mm
Grade two parts, and part B and return mine, agstone, quick lime, dolomite dust enter cylinder mixing granulation together with blending ore
Machine；
S4, agstone is divided into A, B two parts, part A is passed through into screening system, is sieved into less than 0.5mm grade and is greater than
0.5mm grade two parts, and part B and return mine, coke powder, quick lime, dolomite dust enter together with blending ore cylinder mixing system
Grain machine；
S5, quick lime is divided into A, B two parts, part A is taken out, and part B and return mine, coke powder, agstone, dolomite dust
Enter Mixingand granulating drum together with blending ore；
S6, by whole dolomite dusts and return mine, coke powder, agstone, dolomite dust enter together with blending ore cylinder mix system
Grain machine；
S7, it is less than 0.5mm after 0.5mm grade part, the screening of part A agstone being less than after Iron concentrate, the screening of part A coke powder
Intensive mixer is added in grade part, part A quick lime, and adds water to soak material, intensive mixer row in blending process
The moisture of material is 2-4%, incorporation time 1-3min out；
Being greater than 1mm grade part after S8, screening that part A is returned mine adds water to pre-wet, and amount of water control is 3- in material moisture
5%；
S9, the material that will be discharged from intensive mixer return mine together with the 1mm grade that is greater than after pre-wetting from feed end addition circle
Part A is returned mine and is less than 1mm grade part after sieving from discharge end addition drum pelletizer by cylinder granulator, and coal addition position is object
Expect that drop point accounts for the 1/3 of entire drum pelletizer length to discharge end distance；
S10, by part B agglomerated powder, part B coke powder, part B agstone, part B quick lime, dolomite dust and blending ore one
It rises from feed end and Mixingand granulating drum is added, will be greater than after the material being discharged from drum pelletizer, the screening of part A coke powder
It is greater than 0.5mm grade part together from Mixingand granulating drum discharge end after 0.5mm grade part, the screening of part A agstone
It is added, coal addition position accounts for the 1/3 of entire Mixingand granulating drum length to discharge end distance for material drop point；
S11, the material that will be discharged from Mixingand granulating drum sequentially enter cloth, igniting, sintering, cooling, whole grain process, obtain
Finished product sinter is obtained, is used for blast furnace.
2. a kind of iron ore high-efficiency sintered method using low-silicon iron fine powder as described in claim 1, it is characterised in that: described
Iron concentrate is low-silicon iron fine powder, SiO in low-silicon iron fine powder in step S12Mass percentage is lower than 3%.
3. a kind of iron ore high-efficiency sintered method using low-silicon iron fine powder as described in claim 1, it is characterised in that: described
It comprising Iron Ore Powder, pelletizing and lump ore minus sieve, iron-bearing auxiliary material in blending ore in step S1, but does not include Iron concentrate.
4. a kind of iron ore high-efficiency sintered method using low-silicon iron fine powder as described in claim 1, it is characterised in that: described
The ratio that part A of returning mine in step S2 and part B account for sinter mixture is denoted as PA respectivelyRFAnd PBRF, PARFCalculation formula bePBRFIt accounts for the ratio of sinter mixture all to return mine and subtracts PARF, in formula: m (%) is Iron concentrate
The ratio of sinter mixture is accounted for, value range is not higher than 25%；N is proportionality coefficient, value range 0.7-1.3；A (%) is to return
It is greater than the ratio of 1mm grade in mine；Proportionality coefficient n is determined by m value in formula, the functional relation of the two are as follows: n (m)=- 0.024m+
1.35。
5. a kind of iron ore high-efficiency sintered method using low-silicon iron fine powder as described in claim 1, it is characterised in that: described
The ratio that coke powder part A and part B account for sinter mixture in step S3 is denoted as PA respectivelyCAnd PBC, PACCalculation formula are as follows: PAC
=0.08m+0.6；PBCThe ratio for accounting for sinter mixture for whole coke powders subtracts PAC；In formula: m (%) is that Iron concentrate accounts for sintering
The ratio of mixture, value range are not higher than 25%.
6. a kind of iron ore high-efficiency sintered method using low-silicon iron fine powder as described in claim 1, it is characterised in that: described
The ratio that agstone part A and part B account for sinter mixture in step S4 is denoted as PA respectivelySAnd PBS, PASCalculation formula
Are as follows: PAS=0.05m+0.8；PBSThe ratio for accounting for sinter mixture for whole agstones subtracts PAS；In formula: m (%) is iron
Fine powder accounts for the ratio of sinter mixture, and value range is not higher than 25%.
7. a kind of iron ore high-efficiency sintered method using low-silicon iron fine powder as described in claim 1, it is characterised in that: described
The ratio that quick lime part A and part B account for sinter mixture in step S5 is denoted as PA respectivelyLAnd PBL, PALCalculation formula are as follows:
PAL=0.125m+0.15；PBLThe ratio for accounting for sinter mixture for whole quick limes subtracts PAL；In formula: m (%) is Iron concentrate
The ratio of sinter mixture is accounted for, value range is not higher than 25%.
8. a kind of iron ore high-efficiency sintered method using low-silicon iron fine powder as described in claim 1, it is characterised in that: described
In step S9, water is supplemented into drum pelletizer in operation, it is 4-6%, granulation that material moisture, which is discharged, in drum pelletizer
Time is 3-8min.
9. a kind of iron ore high-efficiency sintered method using low-silicon iron fine powder as described in claim 1, it is characterised in that: described
In step S10, add water into Mixingand granulating drum in operation, is 6- from Mixingand granulating drum discharge material moisture
8%, the mixing granulation time is 6-10min.
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| CN113652547A (en) * | 2021-08-16 | 2021-11-16 | 中南大学 | Method and system for producing double-layer pellets |
| CN114622090A (en) * | 2022-03-14 | 2022-06-14 | 中冶赛迪工程技术股份有限公司 | High-proportion magnetic fine powder sintering method for material surface hydrogen-oxygen composite injection |
| CN114622090B (en) * | 2022-03-14 | 2023-12-19 | 中冶赛迪工程技术股份有限公司 | High-proportion magnetic refined powder sintering method by material surface oxyhydrogen composite blowing |
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