CN107267750B - A kind of method of granulating of high-chromic vanadium-titanium ferroferrite sinter mixture - Google Patents
A kind of method of granulating of high-chromic vanadium-titanium ferroferrite sinter mixture Download PDFInfo
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- CN107267750B CN107267750B CN201710537181.5A CN201710537181A CN107267750B CN 107267750 B CN107267750 B CN 107267750B CN 201710537181 A CN201710537181 A CN 201710537181A CN 107267750 B CN107267750 B CN 107267750B
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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
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
- C22C32/001—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with only oxides
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
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Abstract
The present invention provides a kind of method of granulating of high-chromic vanadium-titanium ferroferrite sinter mixture, comprising the following steps: (1) pelletizes after mixing part high-chromic vanadium-titanium ferroferrite, quick lime and water, obtain pelletizing；(2) by remaining high-chromic vanadium-titanium ferroferrite, return mine, flux, fuel, water and pelletizing mix after pelletize, obtain mixture particle；The granularity of the high-chromic vanadium-titanium ferroferrite is 0.25mm~0.074mm；The mass content of the middle moisture of returning mine is 8~10%.Compared with prior art, the invention avoids high-chromic vanadium-titanium ferroferrites to be all directly added into the adverse effect in mixture to pellet performance, and it also improves to return mine and adheres to the ability of fine granules, improve the balling property of mixture, and then can be improved the gas permeability of the bed of material during follow-up sintering, to achieve the purpose that improve sinter quality.
Description
Technical field
The present invention relates to vanadium titano-magnetite technical field more particularly to a kind of high-chromic vanadium-titanium ferroferrite sinter mixtures
Preparation method.
Background technique
China's Panxi Diqu possesses higher (the grade Cr of chromium of chromium content2O30.55%~0.82%), total reserves are up to more than ten
Hundred million tons of red lattice high-chromic vanadium-titanium ferroferrite, the mine have the characteristics that coarse size, granularmetric composition are unreasonable, hydrophily is poor.Due to
The vanadium titano-magnetite coarse size, hydrophily are poor, and the granulation of sinter mixture is difficult, keep bed permeability poor, Sintering Operation Index
It is low.Therefore, the granulation technique for researching and developing high-chromic vanadium-titanium ferroferrite sinter mixture, which has the development and utilization of the mine, to hold the balance
Effect.
At present about being effectively improved the technical solution of the thicker high-chromic vanadium-titanium ferroferrite mixture granulation performance of granularity also
It has not been reported.Therefore, this field urgent need improves the method for the thicker high-chromic vanadium-titanium ferroferrite mixture granulation performance of granularity,
To improve sinter quality.
Summary of the invention
In view of this, the purpose of the present invention is to provide a kind of granulation sides of high-chromic vanadium-titanium ferroferrite sinter mixture
Method, method provided by the invention make high-chromic vanadium-titanium ferroferrite have preferable pellet performance.
The present invention provides a kind of method of granulating of high-chromic vanadium-titanium ferroferrite sinter mixture, comprising the following steps:
(1) it pelletizes after mixing part high-chromic vanadium-titanium ferroferrite, quick lime and water, obtains pelletizing；
(2) by remaining high-chromic vanadium-titanium ferroferrite, return mine, flux, fuel, water and pelletizing are pelletized, obtain mixture
Particle；
The granularity of the high-chromic vanadium-titanium ferroferrite is 0.25mm~0.074mm；
The mass content of the middle moisture of returning mine is 8~10%.
Preferably, mass content of the high-chromic vanadium-titanium ferroferrite in pelletizing is 90.5~92.5% in the step (1)；
Mass content of the quick lime in pelletizing is 3~5% in the step (1)；
Mass content of the water in pelletizing is 4~5% in the step (1).
Preferably, the granularity of the pelletizing is 1~3mm.
Preferably, in the step (1) in high-chromic vanadium-titanium ferroferrite and step (2) high-chromic vanadium-titanium ferroferrite quality
Than for (35~65): (65~35).
Preferably, the flux is quick lime and/or lime stone.
Preferably, the fuel is coke blacking and/or anchracite duff.
Preferably, in the step (2) mass content of the high-chromic vanadium-titanium ferroferrite in mixture particle be 13.5~
25.5%；
The mass content returned mine in mixture particle in the step (2) is 38~43%.
Preferably, mass content of the flux in mixture particle is 3.8~5.5% in the step (2)；
Mass content of the fuel in mixture particle is 4.1~4.25% in the step (2).
Preferably, mass content of the water in mixture particle is 7.4~7.55% in the step (2)；
Mass content of the pelletizing in mixture particle is 14.5~29% in the step (2).
Preferably, the ingredient of the high-chromic vanadium-titanium ferroferrite includes:
The full iron of 54.6~55.25wt%；
The FeO of 28.1~30.96wt%；
The Cr of 0.71~0.9wt%2O3；
The SiO of 3.19~3.59wt%2；
The CaO of 0.84~0.88wt%；
The Al of 2.59~2.97wt%2O3；
The MgO of 3.15~3.25wt%；
0.58~0.61 V2O5；
The TiO of 11.6~11.81wt%2；
The P of 0.009~0.01wt%；
The S of 0.23~0.475wt%.
Compared with prior art, the present invention first will partially be unfavorable for the high-chromic vanadium-titanium ferroferrite and quick lime and water of granulation
Pelletizing；By obtained bead again with return mine and mixture in other compositions carry out secondary granulation；And it is added in returning mine
A certain amount of moisture makes wetting of returning mine.Method of granulating provided by the invention avoids high-chromic vanadium-titanium ferroferrite and all directly adds
Enter the adverse effect in mixture to pellet performance, and high-chromic vanadium-titanium ferroferrite and quick lime are subjected to pelletizing, enhances
The granulation of high-chromic vanadium-titanium ferroferrite improves the intensity of granulation bead, is conducive to the raising of sinter strength；By high-chromic vanadium
Titanomagnetite pelletizes form local high alkalinity in advance, promotes the generation of local calcium ferrite, contains calcium ferrite and silicate always
Amount increases, and is conducive to the mineral composition and structure that improve sinter, improves the intensity and yield rate of sinter.And the present invention will
Return mine carry out wetting make to return mine in water content reach 8~10%, improve to return mine and adhere to the ability of fine granules.Therefore, this hair
The method of granulating of the high-chromic vanadium-titanium ferroferrite sinter mixture of bright offer can improve the granularmetric composition and system of sinter mixture
Graininess energy, and then the gas permeability and sintering velocity of sinter bed are improved, to achieve the purpose that improve sinter quality.
Specific embodiment
The technical scheme in the embodiments of the invention will be clearly and completely described below, it is clear that described implementation
Example is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is common
Technical staff it is improved or retouching all other example, shall fall within the protection scope of the present invention.
The present invention provides a kind of method of granulating of high-chromic vanadium-titanium ferroferrite sinter mixture, comprising the following steps:
(1) it pelletizes after mixing part high-chromic vanadium-titanium ferroferrite, quick lime and water, obtains pelletizing；
(2) by remaining high-chromic vanadium-titanium ferroferrite, return mine, flux, fuel, water and pelletizing mix after pelletize, obtain
Mixture particle；
The granularity of the high-chromic vanadium-titanium ferroferrite is 0.25mm~0.074mm；
The mass content of the middle moisture of returning mine is 8~10%.
The present invention first will partially be unfavorable for the high-chromic vanadium-titanium ferroferrite and quick lime and water pelletizing of granulation；It is small by what is obtained
Ball again with return mine and mixture in other compositions carry out secondary granulation；And a certain amount of moisture is added in returning mine, is made
It returns mine wetting；This method of granulating avoids high-chromic vanadium-titanium ferroferrite and is all directly added into mixture to pellet performance not
Benefit influences, and also improves to return mine and adheres to the ability of fine granules, improves the balling property of mixture, and then after can be improved
The gas permeability of the bed of material in continuous sintering process, to achieve the purpose that improve sinter quality.
In the present invention, in the high-chromic vanadium-titanium ferroferrite preferably the granularity of the mineral of 35~45% mass contents≤
0.074mm；Preferably the mineral granularity of 35~45% mass contents is 0.25~0.74mm in the high-chromic vanadium-titanium ferroferrite.?
In the present invention, the mineral content of grade (0.25~0.74mm) is more among the chromium type high vanadium iron magnetite, accounts for 40% or so,
The hydrophily of this mineral is poor, and the granulation of mixture is difficult in sintering process, so as to cause the poor air permeability of the bed of material, is sintered mineral products
Quality is low.
In the present invention, the ingredient of the high-chromic vanadium-titanium ferroferrite preferably includes:
The full iron of 54.6~55.25wt%；
The FeO of 28.1~30.96wt%；
The Cr of 0.71~0.9wt%2O3；
The SiO of 3.19~3.59wt%2；
The CaO of 0.84~0.88wt%；
The Al of 2.59~2.97wt%2O3；
The MgO of 3.15~3.25wt%；
0.58~0.61 V2O5；
The TiO of 11.6~11.81wt%2；
The P of 0.009~0.01wt%；
The S of 0.23~0.475wt%.
In the present invention, the mass content of full iron is preferably 55% in the high-chromic vanadium-titanium ferroferrite；The quality of FeO contains
Amount preferably 29~30%；The Cr2O3Mass content be preferably 0.75~0.85%, more preferably 0.8%；The SiO2
Mass content be preferably 3.3~3.5%, more preferably 3.4%；The mass content of the CaO is preferably 0.85~0.87%,
More preferably 0.86%；The Al2O3Mass content be preferably 2.7~2.8%；The mass content of the MgO is preferably
3.2%；The V2O5Mass content be preferably 0.59~0.60%；The TiO2Mass content be preferably 11.7%；It is described
The mass content of P is preferably 0.0095%；The mass content of the S is preferably 0.3~0.4%.The present invention is to the chromium type high
The source of vanadium titano-magnetite is not particularly limited, using red lattice vanadium titano-magnetite well known to those skilled in the art.
In the present invention, high-chromic vanadium-titanium ferroferrite in high-chromic vanadium-titanium ferroferrite and step (2) in the step (1)
Mass ratio is preferably (30~70): (70~30), more preferably (35~65): (65~35), most preferably (40~60): (60
~40).In the present invention, in the step (1) high-chromic vanadium-titanium ferroferrite in total high-chromic vanadium-titanium ferroferrite (total Gao Ge
Type vanadium iron magnetite refers to the total amount of high-chromic vanadium-titanium ferroferrite used in step (1) and step (2)) in mass content
Preferably 45~65%, more preferably 50~60%, most preferably 55%；In addition to the high-chromic vanadium-titanium ferroferrite in step (1)
Remaining high-chromic vanadium-titanium ferroferrite is completely used for step (2).
In the present invention, mass content of the high-chromic vanadium-titanium ferroferrite in pelletizing is preferably 90.5 in the step (1)
~92.5%；More preferably 91~92%, most preferably 91.5%.
In the present invention, mass content of the quick lime in pelletizing is preferably 3~5% in the step (1), more preferably
3.5~4.5%, most preferably 4%.In the present invention, the mass content of CaO is preferably 50% or more in the quick lime, more
Preferably 90% or more, i.e. activity ash.
In the present invention, mass content of the water in pelletizing is preferably 4~5% in the step (1), and more preferably 4.2
~4.8%, most preferably 4.4~4.6%.In the present invention, in step (1) pelletizing in addition to quick lime and water, it is remaining at
It is divided into high-chromic vanadium-titanium ferroferrite.
In the present invention, the granularity of the pelletizing is preferably 1~3mm, more preferably 1.5~2.5mm, most preferably 2mm.
The method that the present invention pelletizes to step (1) does not have special limitation, using method of granulating well known to those skilled in the art in circle
It is pelletized in disk pelletizer.
In the present invention, mass content of the high-chromic vanadium-titanium ferroferrite in mixture particle is preferred in the step (2)
It is 12~27, more preferably 13.5~25.5%, more preferably 15~22%, most preferably 18~20%.In the present invention, institute
State in step (2) that high-chromic vanadium-titanium ferroferrite is consistent with high-chromic vanadium-titanium ferroferrite in step (1), details are not described herein.
In the present invention, the < 10mm Fine fraction of ore returned mine to be generated in sinter shattering process and enter in blast furnace
< 10mm fine fraction sinter under the sieve of stokehold, this partially sinters mine and returns again is sintered again in sinter mixture.In the present invention
In, the mass content for returning mine middle moisture is preferably 8~10%, and more preferably 8.5~9.5%, most preferably 9%.This hair
Bright will preferably return mine before secondary granulation (step (2) granulation) makes pre-wetting of returning mine plus a certain amount of moisture, makes to return mine
The mass content of middle moisture reaches 8~10%.In the present invention, it returns mine in the step (2) quality in mixture particle
Content is preferably 35~45, and more preferably 38~43%, more preferably 40~41%.
In the present invention, the flux is preferably quick lime and/or lime stone.In the present invention, it is melted in the step (2)
Mass content of the agent in mixture particle is preferably 3.8~5.5%, more preferably 4~5.2%, most preferably 4.5~
4.8%.
In the present invention, the fuel is preferably coke blacking and/or anchracite duff.In the present invention, in the fuel
Carbon content is preferably 65~84%.In the present invention, mass content of the fuel in mixture particle is preferred in the step (2)
It is 4.0~4.3, more preferably 4.1~4.25%, more preferably 4.15~4.2%.
In the present invention, mass content of the water in mixture particle is preferably 7.4~7.55% in the step (2),
More preferably 7.45~7.5%.
In the present invention, mass content of the described ball in mixture particle is preferably 13.5~30%, more preferably
15~25%, most preferably 20%.In the present invention, high-chromic vanadium-titanium ferroferrite is removed in step (2) mixture particle, is returned
Outside mine, flux, fuel and water, remaining ingredient, which is that step (1) is obtained, rolls into a ball ball.
The present invention does not have special limitation to the method pelletized in the step (2), using known to those skilled in the art
Pelletizing process.In the present invention, granulation can pelletize in cylinder pelletizing in the step (2)；The Granulation time is excellent
It is selected as 7~8min；Revolving speed in the pelletization is preferably 23~25r/min.
After mixture particle is prepared, mixture particle described in above-mentioned technical proposal is preferably carried out cloth by the present invention
And ignition sintering, obtain sinter.In the present invention, the bed depth of the cloth is preferably 720~730mm, more preferably
725mm.In the present invention, the firing temperature of the ignition sintering is preferably 1150~1160 DEG C, and more preferably 1155 DEG C；It is described
The duration of ignition of ignition sintering is preferably 2.5~2.6min.
The method of granulating of high-chromic vanadium-titanium ferroferrite sinter mixture provided by the invention can improve sinter mixture
Granularmetric composition and pellet performance improve the gas permeability and sintering velocity of sinter bed, to improve Sintering Yield；And it will be high
Chromic vanadium-titanium ferroferrite and quick lime carry out pelletizing, enhance the granulation of high-chromic vanadium-titanium ferroferrite, improve granulation bead
Intensity is conducive to the raising of sinter strength；Further high chromium vanadium titano-magnetite forms during preparatory granulation
Local high alkalinity promotes the generation of local calcium ferrite, increases calcium ferrite and silicate total content, is conducive to improve sinter
Mineral composition and structure, improve the intensity and yield rate of sinter；High-chromic vanadium-titanium ferroferrite sintering provided by the invention is mixed
The method of granulating for closing material can improve the metallurgical performance of sinter, be conducive to the technical-economic index for improving blast furnace process.
Raw materials used following embodiment of the present invention is commercial goods.
High-chromic vanadium-titanium ferroferrite used is red lattice high-chromic vanadium-titanium ferroferrite, becomes and includes:
| Ingredient, wt% | TFe | FeO | Cr2O3 | SiO2 | CaO | Al2O3 | MgO | V2O5 | TiO2 | P | S |
| 55 | 29 | 0.8 | 3.4 | 0.86 | 2.7 | 3.2 | 0.59 | 11.7 | 0.009~0.01 | 0.23~0.475 |
The granularity of high-chromic vanadium-titanium ferroferrite is 0.25mm~0.074mm, and wherein the quality of 0.25mm~0.10mm is total
55%, 0.10mm of quality~0.074mm quality is the 45% of gross mass.
The mass content of CaO is 84% in quick lime used.
Used to return mine as the sinter under sieving before blast furnace feeding, granularity < 5mm, weight of iron content is 49%.
The carbon content of coke blacking used is 82%；
What pelletising drum used provided for Beijing Jindu Metallurgy Mechanism Mill, model
Comparative example 1
By 32.5 kilograms of high-chromic vanadium-titanium ferroferrite, 4.8 kilograms of quick lime, 24 kilograms return mine, 2.85 kilograms of cokes
Pelletising drum pelletizing under conditions of 6min, 20r/min is used after powdered carbon and the mixing of 5.6 kilograms of water, obtains mixture
Grain；It is described to return mine without wettability treatment, moisture-free.
The granularity for the mixture particle that comparative example 1 of the present invention is prepared is tested using the method that sieve sieves,
The arithmetic mean of instantaneous value for taking the mass percent of mixture particle grain size content is average grain diameter；Testing result is as shown in table 1, table 1
For the granularmetric composition for the mixture particle that the embodiment of the present invention and comparative example are prepared.
Embodiment 1
In circle after 14.6 kilograms of high-chromic vanadium-titanium ferroferrite, 0.46 kilogram of quick lime and 0.62 kilogram of water are mixed
The pelletizing for obtaining that granularity is 1~3mm at bead is rolled on disk pelletizer；The mass content of quick lime is 3% in the pelletizing,
The mass content of moisture is 4%；High-chromic vanadium-titanium ferroferrite used is the 45% of total high-chromic vanadium-titanium ferroferrite quality.
By 17.9 kilograms of high-chromic vanadium-titanium ferroferrite, 24 kilograms return mine, 4.34 kilograms of quick lime, 2.85 kilograms
Use pelletising drum in the condition of 7.5min, 24r/min after coke blacking, 4.98 kilograms of water and the mixing of 15.6 kilograms of pelletizing
Lower pelletizing, obtains mixture particle；Described return mine is soaked with water in advance, and wherein the mass content of moisture is 8%.
The granularity for the mixture particle that the embodiment of the present invention 1 is prepared is detected according to the method for comparative example 1, is examined
Survey that the results are shown in Table 1, as shown in Table 1, compared with comparative example 1, mixture particle > that the embodiment of the present invention 1 is prepared
The grain size content of 3mm increases by the powder decline 1% of 1.6%, < 0.5mm, and average grain diameter increases 0.36mm.
Embodiment 2
Mixture particle is prepared according to method described in embodiment 1；Unlike the first embodiment, it is prepared
The mass content of quick lime is 4% in pelletizing, and the mass content of moisture is 4.5%, prepares high-chromic vanadium titanium used when pelletizing
Magnetic iron ore is the 55% of total high-chromic vanadium-titanium ferroferrite quality；Returning mine for using is soaked with water in advance, wherein the quality of moisture
Content is 9%.
The granularity for the mixture particle that the embodiment of the present invention 2 is prepared is detected according to the method for comparative example 1, is examined
Survey that the results are shown in Table 1, as shown in Table 1, compared with comparative example 1, mixture particle > that the embodiment of the present invention 2 is prepared
The grain size content of 3mm increases by the powder decline 1.4% of 3.6%, < 0.5mm, and average grain diameter increases 0.67mm.
Embodiment 3
Mixture particle is prepared according to method described in embodiment 1；Unlike the first embodiment, it is prepared
The mass content of quick lime is 5% in pelletizing, and the mass content of moisture is 5%, prepares high-chromic vanadium titanium magnetic used when pelletizing
Iron ore is the 65% of total high-chromic vanadium-titanium ferroferrite quality；Returning mine for using is soaked with water in advance, and wherein the quality of moisture contains
Amount is 10%.
The granularity for the mixture particle that the embodiment of the present invention 3 is prepared is detected, testing result is as shown in table 1,
As shown in Table 1, compared with comparative example 1, the grain size content for the mixture particle > 3mm that the embodiment of the present invention 3 is prepared increases
The powder decline 2.2% of 4.75%, < 0.5mm, average grain diameter increases 0.83mm.
Comparative example 2
Mixture particle is prepared according to the method for embodiment 3, as different from Example 3, use is returned mine in advance
It is soaked with water, wherein the mass content of moisture is 4%.
The granularity for the mixture particle that comparative example 2 of the present invention is prepared is detected, testing result is as shown in table 1.
Comparative example 3
Mixture particle is prepared according to the method for embodiment 3, as different from Example 3, use is returned mine in advance
It is soaked with water, wherein the mass content of moisture is 12%.
The granularity for the mixture particle that comparative example 3 of the present invention is prepared is detected, testing result is as shown in table 1.
The granularmetric composition for the mixture particle that 1 embodiment of the present invention of table and comparative example are prepared
As shown in Table 1, the granularity for the high-chromic vanadium-titanium ferroferrite sinter mixture that method provided by the invention is prepared
Increase, is conducive to the gas permeability and sintering velocity that improve sinter bed, to improve Sintering Yield.
Comparative example 4
The mixture particle that comparative example 1 of the present invention is prepared carries out cloth, thickness of feed layer 725mm, at 1155 DEG C
The lower ignition sintering for carrying out 2.55min, obtains sinter.
Sintering velocity is calculated according to bed depth and sintering time:
V=h/t；
V, sintering velocity, mm/min；
H, bed depth, mm；
T, sintering time, min.
Sinter is subjected to natural cooling, falls 2 times, is sieved from 2m eminence, take the percentage of > 10mm grain size content
Number meter yield rate:
Y=M1/M；
Y, yield rate, %；
M1, > 10mm finished product sinter quality, kg；
M, sinter gross mass, kg.
Usage factor:
P=(M1/1000)×(1/A)×(60/t)；
P, usage factor, t/m2×h；
M1, > 10mm finished product sinter quality, kg；
A, sintering area, m2,
T, sintering time, min.
It takes 10~40mm grain size content to measure sintered ore rotary drum strength using 1/2ISO drum unit, finally uses 6.3mm standard
It is sieved, the percentage of > 6.3mm grain size content is taken to indicate sintered ore rotary drum strength；
Tumbler index:
TI=M2/M3；
TI, tumbler index, %；
M2, > 6.3mm grade weight after rotary drum, kg；
M3, enter sample weight before rotary drum, kg.
The measurement of low-temperature reduction disintegration energy " is used by GB 13242-91 after the static reduction of iron ore low temperature dusting test
The method of cold rotary drum " it carries out, reducing gas group becomes CO and N2Volume ratio is 30:70, takes the quality hundred less than 3.15mm grade
Score makees cryogenic reducting powder index (RDI)；Medium temperature reducing property according to GB13244-91, " try by carbon containing refractory inoxidizability
Proved recipe method " it carries out, reducing gas group becomes CO and N2Volume ratio is 30:70, and taking reduction degree index when 180min is reduction degree
Index (RI).
Above-mentioned test is carried out to the sinter that comparative example 4 is prepared, for test result as shown in table 2 and table 3, table 2 is this
Sintering furnace mineral products that inventive embodiments and comparative example are prepared, quality index；Table 3 is prepared by the embodiment of the present invention and comparative example
The reduction degree and low-temperature reduction disintegration energy of obtained sinter.
Embodiment 4
Sinter is prepared according to the method for comparative example 4, unlike comparative example 4, is prepared using embodiment 1
Mixture particle.
It is detected according to the sinter that the method for comparative example 4 obtains embodiment 4,3 institute of testing result such as table 2 and table
Show, it can be seen from table 2 and table 3 compared with comparative example 4, the sintering velocity of the embodiment of the present invention 4 improves 0.57mm/min, burns
It ties mine drum strength and improves 0.26%, yield rate improves 1.95%, and yield increases by 1.9%, under RDI of Sinter
Drop 3.23%, reduction degree improve 1.36%.
Embodiment 5
Sinter is prepared according to the method for comparative example 4, unlike comparative example 4, is prepared using embodiment 2
Mixture particle.
It is detected according to the sinter that the method for comparative example 4 obtains embodiment 5,3 institute of testing result such as table 2 and table
Show, it can be seen from table 2 and table 3 compared with comparative example 4, the sintering velocity of the embodiment of the present invention 5 improves 0.93mm/min, burns
It ties mine drum strength and improves 0.39%, yield rate improves 3.52%, and yield increases by 2.93%, under RDI of Sinter
Drop 3.86%, reduction degree improve 1.62%.
Embodiment 6
Sinter is prepared according to the method for comparative example 4, unlike comparative example 4, is prepared using embodiment 3
Mixture particle.
It is detected according to the sinter that the method for comparative example 4 obtains embodiment 6,3 institute of testing result such as table 2 and table
Show, it can be seen from table 2 and table 3 compared with comparative example 4, the sintering velocity of the embodiment of the present invention 6 improves 1.37mm/min, burns
It ties mine drum strength and improves 0.82%, yield rate improves 3.17%, and yield increases by 3.21%, under RDI of Sinter
Drop 5.05%, reduction degree improve 2.18%.
Comparative example 5
Sinter is prepared according to the method for comparative example 4, is prepared unlike comparative example 4 using comparative example 2
Mixture particle.
According to the performance for the sinter that the method test and comparison example 5 of comparative example 4 is prepared, testing result such as table 2 and table 3
It is described.
Comparative example 6
Sinter is prepared according to the method for comparative example 4, is prepared unlike comparative example 4 using comparative example 3
Mixture particle.
According to the performance for the sinter that the method test and comparison example 6 of comparative example 4 is prepared, testing result such as table 2 and table 3
It is described.
Sintering furnace mineral products that 2 embodiment of the present invention of table and comparative example are prepared, quality index
| Number | Sintering velocity mm/min | Drum strength/% | Yield rate/% | Usage factor t/m2.h |
| Comparative example 4 | 20.53 | 76.66 | 69.45 | 1.465 |
| Embodiment 4 | 21.10 | 76.92 | 71.40 | 1.493 |
| Embodiment 5 | 21.46 | 77.05 | 72.97 | 1.508 |
| Embodiment 6 | 21.91 | 77.48 | 72.62 | 1.512 |
| Comparative example 5 | 21.32 | 76.98 | 72.34 | 1.502 |
| Comparative example 6 | 21.65 | 77.23 | 72.50 | 1.509 |
From table 2 it can be seen that the sintering rate for the mixture particle that method provided by the invention obtains, drum strength, at
Product rate, usage factor are more preferable.
The reduction degree and low-temperature reduction disintegration energy for the sinter that 3 embodiment of the present invention of table and comparative example are prepared
From table 3 it can be seen that the RDI of Sinter for the mixture particle that method provided by the invention obtains
It reduces, sinter reduction degree improves.
As seen from the above embodiment, the present invention provides a kind of granulation sides of high-chromic vanadium-titanium ferroferrite sinter mixture
Method, comprising the following steps: (1) pelletize after mixing part high-chromic vanadium-titanium ferroferrite, quick lime and water, obtain pelletizing；
(2) by remaining high-chromic vanadium-titanium ferroferrite, return mine, flux, fuel, water and pelletizing mix after pelletize, obtain mixture
Grain；The granularity of the high-chromic vanadium-titanium ferroferrite is 0.25mm~0.074mm；The mass content of the middle moisture of returning mine be 8~
10%.Compared with prior art, the invention avoids high-chromic vanadium-titanium ferroferrites to be all directly added into mixture to granulation property
The adverse effect of energy, and also improve to return mine and adhere to the ability of fine granules, the balling property of mixture is improved, and then can
The gas permeability of the bed of material during raising follow-up sintering, to achieve the purpose that improve sinter quality.
What has been described above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill of the art
For personnel, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (6)
1. a kind of method of granulating of high-chromic vanadium-titanium ferroferrite sinter mixture, comprising the following steps:
(1) it pelletizes after mixing part high-chromic vanadium-titanium ferroferrite, quick lime and water, obtains pelletizing；
(2) by remaining high-chromic vanadium-titanium ferroferrite, return mine, flux, fuel, water and pelletizing are pelletized, obtain mixture particle；
The granularity of the high-chromic vanadium-titanium ferroferrite is 0.25mm ~ 0.074mm；
The mass content of the middle moisture of returning mine is 8 ~ 10%；
Mass content of the high-chromic vanadium-titanium ferroferrite in pelletizing is 90 ~ 93% in the step (1)；
Mass content of the quick lime in pelletizing is 3 ~ 5% in the step (1)；
Mass content of the water in pelletizing is 4 ~ 5% in the step (1)；
The granularity of the pelletizing is 1.5 ~ 2.5mm；
In the step (1) in high-chromic vanadium-titanium ferroferrite and step (2) mass ratio of high-chromic vanadium-titanium ferroferrite be (30 ~
70): (70 ~ 30)；
The ingredient of the high-chromic vanadium-titanium ferroferrite includes:
The full iron of 54.6 ~ 55.25wt%；
The FeO of 28.1 ~ 30.96wt%；
The Cr of 0.71 ~ 0.9wt%2O3；
The SiO of 3.19 ~ 3.59wt%2；
The CaO of 0.84 ~ 0.88wt%；
The Al of 2.59 ~ 2.97wt%2O3；
The MgO of 3.15 ~ 3.25wt%；
0.58 ~ 0.61 V2O5；
The TiO of 11.6 ~ 11.81wt%2；
The P of 0.009 ~ 0.01wt%；
The S of 0.23 ~ 0.475wt%.
2. the method according to claim 1, wherein the flux is quick lime and/or lime stone.
3. the method according to claim 1, wherein the fuel is coke blacking and/or anchracite duff.
4. the method according to claim 1, wherein high-chromic vanadium-titanium ferroferrite is mixing in the step (2)
Expect that the mass content in particle is 12 ~ 27%；
The mass content returned mine in mixture particle in the step (2) is 35 ~ 45%.
5. the method according to claim 1, wherein matter of the flux in mixture particle in the step (2)
Measuring content is 3.5 ~ 5.7%；
Mass content of the fuel in mixture particle is 4.0 ~ 4.3% in the step (2).
6. the method according to claim 1, wherein quality of the water in mixture particle in the step (2)
Content is 7.3 ~ 7.6%；
Mass content of the pelletizing in mixture particle is 13.5 ~ 30% in the step (2).
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