CN107267750A - 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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- CN107267750A CN107267750A CN201710537181.5A CN201710537181A CN107267750A CN 107267750 A CN107267750 A CN 107267750A CN 201710537181 A CN201710537181 A CN 201710537181A CN 107267750 A CN107267750 A CN 107267750A
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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 invention provides a kind of method of granulating of high-chromic vanadium-titanium ferroferrite sinter mixture, comprise the following steps：(1) pelletized 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 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%.Compared with prior art, the adverse effect in compound to pellet performance is all directly added into present invention, avoiding high-chromic vanadium-titanium ferroferrite, and also improve the ability for adhesion fine granules of returning mine, improve the balling property of compound, and then the gas permeability of the bed of material during follow-up sintering can be improved, so as to reach the purpose for improving sintering deposit 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 mixture
Preparation method.
Background technology
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 ore deposit has the features such as 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, makes bed permeability poor, Sintering Operation Index
It is low.Therefore, exploitation of the granulation technique of research and development high-chromic vanadium-titanium ferroferrite sinter mixture to the ore deposit have very important
Effect.
At present on being effectively improved the technical scheme of the thicker high-chromic vanadium-titanium ferroferrite mixture granulation performance of granularity also
Have no report.Therefore, this area active demand improves the method for the thicker high-chromic vanadium-titanium ferroferrite mixture granulation performance of granularity,
To improve sintering deposit quality.
The content of the invention
In view of this, it is an object of the invention to provide a kind of granulation side of high-chromic vanadium-titanium ferroferrite sinter mixture
Method, the method that the present invention is provided makes high-chromic vanadium-titanium ferroferrite have preferable pellet performance.
The invention provides a kind of method of granulating of high-chromic vanadium-titanium ferroferrite sinter mixture, comprise the following steps：
(1) pelletized 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 are pelletized, and obtain compound
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%.
It is preferred that, 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 step (1) reclaimed water in pelletizing is 4~5%.
It is preferred that, the granularity of the pelletizing is 1~3mm.
It is preferred that, 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).
It is preferred that, the flux is quick lime and/or lime stone.
It is preferred that, the fuel is coke blacking and/or anchracite duff.
It is preferred that, 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 the step (2) in mixture particle is 38~43%.
It is preferred that, 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).
It is preferred that, mass content of step (2) reclaimed water in mixture particle is 7.4~7.55%；
Mass content of the pelletizing in mixture particle is 14.5~29% in the step (2).
It is preferred that, the composition of the high-chromic vanadium-titanium ferroferrite includes：
54.6~55.25wt% full iron；
28.1~30.96wt% FeO；
0.71~0.9wt% Cr2O3；
3.19~3.59wt% SiO2；
0.84~0.88wt% CaO；
2.59~2.97wt% Al2O3；
3.15~3.25wt% MgO；
0.58~0.61 V2O5；
11.6~11.81wt% TiO2；
0.009~0.01wt% P；
0.23~0.475wt% S.
Compared with prior art, part is first unfavorable for the high-chromic vanadium-titanium ferroferrite and quick lime and water of granulation by the present invention
Pelletizing；By obtained bead again with return mine and compound in other compositions carry out secondary granulation；And added in returning mine
A certain amount of moisture, makes wetting of returning mine.The method of granulating that the present invention is provided avoids high-chromic vanadium-titanium ferroferrite and all directly added
Enter the adverse effect to pellet performance in compound, and high-chromic vanadium-titanium ferroferrite and quick lime are subjected to pelletizing, enhance
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
Granulation forms local high alkalinity to titanomagnetite in advance, promotes the generation of local calcium ferrite, calcium ferrite and silicate is always contained
Amount increase, is conducive to improving mineral composition and the structure of sintering deposit, improves the intensity and yield rate of sintering deposit.And the present invention will
Progress wetting of returning mine makes the water content in returning mine reach 8~10%, improves the ability for adhesion fine granules of returning mine.Therefore, this hair
The method of granulating of the high-chromic vanadium-titanium ferroferrite sinter mixture of bright offer can improve granularmetric composition and the system of sinter mixture
Graininess energy, and then the gas permeability and sintering velocity of sinter bed are improved, so as to reach the purpose for improving sintering deposit quality.
Embodiment
The technical scheme in the embodiment of the present invention will be clearly and completely described below, it is clear that described implementation
Example only a part of embodiment of the invention, rather than whole embodiments.Based on the embodiment in the present invention, this area is common
Technical staff it is improved or retouching all other example, belong to the scope of protection of the invention.
The invention provides a kind of method of granulating of high-chromic vanadium-titanium ferroferrite sinter mixture, comprise the following steps：
(1) pelletized 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 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%.
Part is first unfavorable for the high-chromic vanadium-titanium ferroferrite and quick lime and water pelletizing of granulation by the present invention；It is small by what is obtained
Ball again with return mine and compound in other compositions carry out secondary granulation；And a certain amount of moisture is added in returning mine, is made
Return mine wetting；This method of granulating avoids high-chromic vanadium-titanium ferroferrite and is all directly added into compound to pellet performance not
Profit influence, and also improve the ability for adhesion fine granules of returning mine, improves the balling property of compound, and then after can improving
The gas permeability of the bed of material in continuous sintering process, so as to reach the purpose for improving sintering deposit 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 in the middle of the chromium type high vanadium iron magnetite, accounts for 40% or so,
The hydrophily of this mineral is poor, and the granulation of compound is difficult in sintering process, so as to cause the poor air permeability of the bed of material, sinters mineral products
Quality is low.
In the present invention, the composition of the high-chromic vanadium-titanium ferroferrite is preferably included：
54.6~55.25wt% full iron；
28.1~30.96wt% FeO；
0.71~0.9wt% Cr2O3；
3.19~3.59wt% SiO2；
0.84~0.88wt% CaO；
2.59~2.97wt% Al2O3；
3.15~3.25wt% MgO；
0.58~0.61 V2O5；
11.6~11.81wt% TiO2；
0.009~0.01wt% P；
0.23~0.475wt% S.
In the present invention, the mass content of full iron is preferably 55% in the high-chromic vanadium-titanium ferroferrite；FeO quality contains
Amount is 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
P mass content 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), be 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 in step (1) and step (2) total amount of high-chromic vanadium-titanium ferroferrite used) 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, CaO mass content is preferably more than 50% in the quick lime, more
Preferably more than 90%, i.e. activity ash.
In the present invention, mass content of step (1) reclaimed water in pelletizing is preferably 4~5%, 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 into
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
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)
For 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), will not be repeated here.
In the present invention, the ＜ 10mm Fine fraction of ore for returning mine to produce in sintering deposit shattering process and enter in blast furnace
＜ 10mm fine fraction sintering deposits under the sieve of stokehold, this partially sinters ore deposit and returned again sinters again in sinter mixture.In the present invention
In, the mass content for returning mine middle moisture is preferably 8~10%, more preferably 8.5~9.5%, most preferably 9%.This hair
Bright will preferably be returned 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, returned mine in the step (2) quality in mixture particle
Content is preferably 35~45, 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, 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)
For 4.0~4.3, more preferably 4.1~4.25%, more preferably 4.15~4.2%.
In the present invention, mass content of step (2) reclaimed water in mixture particle is preferably 7.4~7.55%,
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 ore deposit, flux, fuel and water, remaining composition is the obtained group's ball of step (1).
The present invention does not have special limitation to the method for granulation in the step (2), is known using 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
Elect 7~8min as；Rotating speed in the pelletization is preferably 23~25r/min.
Prepare after mixture particle, the mixture particle described in above-mentioned technical proposal is preferably carried out cloth by the present invention
With igniting sintering, sintering deposit is obtained.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 igniting sintering is preferably 1150~1160 DEG C, more preferably 1155 DEG C；It is described
The duration of ignition of igniting sintering is preferably 2.5~2.6min.
The method of granulating for the high-chromic vanadium-titanium ferroferrite sinter mixture that the present invention is provided can improve sinter mixture
Granularmetric composition and pellet performance, improve the gas permeability and sintering velocity of sinter bed, so as to improve Sintering Yield；And by height
Chromic vanadium-titanium ferroferrite carries out pelletizing with quick lime, enhances the granulation of high-chromic vanadium-titanium ferroferrite, improves granulation bead
Intensity, is conducive to the raising of sinter strength；Further high chromium vanadium titano-magnetite is formd during advance granulation
Local high alkalinity, promotes the generation of local calcium ferrite, makes calcium ferrite and the increase of silicate total content, is conducive to improving sintering deposit
Mineral composition and structure, improve sintering deposit intensity and yield rate；The high-chromic vanadium-titanium ferroferrite sintering that the present invention is provided is mixed
The metallurgical performance of sintering deposit can be improved by closing the method for granulating of material, be conducive to improving the technical-economic index of blast furnace process.
Raw materials used following examples of the present invention are commercial goods.
High-chromic vanadium-titanium ferroferrite used be red lattice high-chromic vanadium-titanium ferroferrite, as including：
| Composition, 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 0.25mm~0.10mm quality is total
55%, 0.10mm of quality~0.074mm quality is the 45% of gross mass.
CaO mass content is 84% in quick lime used.
Used to return mine as the sintering deposit under being sieved 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 Jiao
Pelletising drum pelletizing under conditions of 6min, 20r/min is used after powdered carbon and the mixing of 5.6 kilograms of water, compound is obtained
Grain；It is described to return mine without wettability treatment, moisture-free.
The granularity for the mixture particle that the method sieved using sieve is prepared to comparative example 1 of the present invention is tested,
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
The granularmetric composition of the mixture particle prepared for the embodiment of the present invention and comparative example.
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
Bead is rolled on disk pelletizer, the pelletizing that granularity is 1~3mm is obtained；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
Pelletising drum is used in 7.5min, 24r/min condition after coke blacking, 4.98 kilograms of water and the mixing of 15.6 kilograms of pelletizing
Lower pelletizing, obtains mixture particle；The water in advance wetting of returning mine, the wherein mass content of moisture is 8%.
The granularity for the mixture particle that method according to comparative example 1 is prepared to the embodiment of the present invention 1 is detected, is examined
Survey result as shown in table 1, as shown in Table 1, compared with comparative example 1, the mixture particle ＞ that the embodiment of the present invention 1 is prepared
The powder that 3mm grain size content increases by 1.6%, ＜ 0.5mm declines 1%, average grain diameter increase 0.36mm.
Embodiment 2
Mixture particle is prepared according to the method described in embodiment 1；As different from Example 1, prepare
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 during pelletizing
Magnetic iron ore is the 55% of total high-chromic vanadium-titanium ferroferrite quality；Return mine the water in advance wetting, the wherein quality of moisture used
Content is 9%.
The granularity for the mixture particle that method according to comparative example 1 is prepared to the embodiment of the present invention 2 is detected, is examined
Survey result as shown in table 1, as shown in Table 1, compared with comparative example 1, the mixture particle ＞ that the embodiment of the present invention 2 is prepared
The powder that 3mm grain size content increases by 3.6%, ＜ 0.5mm declines 1.4%, average grain diameter increase 0.67mm.
Embodiment 3
Mixture particle is prepared according to the method described in embodiment 1；As different from Example 1, prepare
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 during pelletizing
Iron ore is the 65% of total high-chromic vanadium-titanium ferroferrite quality；The water in advance wetting of returning mine used, the quality of wherein moisture contains
Measure as 10%.
The granularity of the mixture particle prepared to the embodiment of the present invention 3 detects that testing result is as shown in table 1,
As shown in Table 1, compared with comparative example 1, the grain size content increase for the mixture particle ＞ 3mm that the embodiment of the present invention 3 is prepared
4.75%, ＜ 0.5mm powder decline 2.2%, average grain diameter increase 0.83mm.
Comparative example 2
Method according to embodiment 3 prepares mixture particle, as different from Example 3, and returning mine for use is advance
Soaked with water, wherein the mass content of moisture is 4%.
The granularity of the mixture particle prepared to comparative example 2 of the present invention detects that testing result is as shown in table 1.
Comparative example 3
Method according to embodiment 3 prepares mixture particle, as different from Example 3, and returning mine for use is advance
Soaked with water, wherein the mass content of moisture is 12%.
The granularity of the mixture particle prepared to comparative example 3 of the present invention detects that testing result is as shown in table 1.
The granularmetric composition for the mixture particle that the embodiment of the present invention of table 1 and comparative example are prepared
As shown in Table 1, the granularity for the high-chromic vanadium-titanium ferroferrite sinter mixture that the method that the present invention is provided is prepared
Increase, is conducive to improving the gas permeability and sintering velocity of sinter bed, so as to improve Sintering Yield.
Comparative example 4
The mixture particle that comparative example 1 of the present invention is prepared carries out cloth, and thickness of feed layer is 725mm, at 1155 DEG C
Lower progress 2.55min igniting sintering, obtains sintering deposit.
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.
Sintering deposit is subjected to natural cooling, falls 2 times, is sieved from 2m eminences, take the percentage of ＞ 10mm grain size contents
Number meter yield rate：
Y=M1/M；
Y, yield rate, %；
M1, ＞ 10mm finished product sinter qualities, kg；
M, sintering deposit gross mass, kg.
Usage factor：
P=(M1/1000)×(1/A)×(60/t)；
P, usage factor, t/m2×h；
M1, ＞ 10mm finished product sinter qualities, kg；
A, sintering area, m2,
T, sintering time, min.
Take 10~40mm grain size contents to determine sintered ore rotary drum strength using 1/2ISO drum units, finally use 6.3mm standards
Sieved, take the percentage of ＞ 6.3mm grain size contents to represent sintered ore rotary drum strength；
Tumbler index：
TI=M2/M3；
TI, tumbler index, %；
M2, ＞ 6.3mm grade weight, kg after rotary drum；
M3, enter sample weight before rotary drum, kg.
The measure of low-temperature reduction disintegration energy presses GB 13242-91《Used after the static reduction of iron ore low temperature efflorescence experiment
The method of cold rotary drum》Carry out, reducing gas composition is CO and N2Volume ratio is 30:70, take the quality hundred less than 3.15mm grades
Fraction makees cryogenic reducting powder index (RDI)；Middle temperature reducing property is according to GB13244-91《Carbon containing refractory inoxidizability is tried
Proved recipe method》Carry out, reducing gas composition is CO and N2Volume ratio is 30:70, it is reduction degree to take reduction degree index during 180min
Index (RI).
The sintering deposit prepared to comparative example 4 carries out above-mentioned test, and test result is as shown in table 2 and table 3, and 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 sintering deposit.
Embodiment 4
Method according to comparative example 4 prepares sintering deposit, from unlike comparative example 4, being prepared using embodiment 1
Mixture particle.
The sintering deposit that method according to comparative example 4 is obtained to embodiment 4 detects, testing result such as table 2 and the institute of table 3
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
Tie ore deposit drum strength and improve 0.26%, yield rate improves 1.95%, and yield increases under 1.9%, RDI of Sinter
Drop 3.23%, reduction degree improves 1.36%.
Embodiment 5
Method according to comparative example 4 prepares sintering deposit, from unlike comparative example 4, being prepared using embodiment 2
Mixture particle.
The sintering deposit that method according to comparative example 4 is obtained to embodiment 5 detects, testing result such as table 2 and the institute of table 3
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
Tie ore deposit drum strength and improve 0.39%, yield rate improves 3.52%, and yield increases under 2.93%, RDI of Sinter
Drop 3.86%, reduction degree improves 1.62%.
Embodiment 6
Method according to comparative example 4 prepares sintering deposit, from unlike comparative example 4, being prepared using embodiment 3
Mixture particle.
The sintering deposit that method according to comparative example 4 is obtained to embodiment 6 detects, testing result such as table 2 and the institute of table 3
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
Tie ore deposit drum strength and improve 0.82%, yield rate improves 3.17%, and yield increases under 3.21%, RDI of Sinter
Drop 5.05%, reduction degree improves 2.18%.
Comparative example 5
Method according to comparative example 4 prepares sintering deposit, from being prepared unlike comparative example 4 using comparative example 2
Mixture particle.
The performance for the sintering deposit that method test and comparison example 5 according to comparative example 4 is prepared, testing result such as table 2 and table 3
It is described.
Comparative example 6
Method according to comparative example 4 prepares sintering deposit, from being prepared unlike comparative example 4 using comparative example 3
Mixture particle.
The performance for the sintering deposit that method test and comparison example 6 according to comparative example 4 is prepared, testing result such as table 2 and table 3
It is described.
Sintering furnace mineral products that the embodiment of the present invention of table 2 and comparative example are prepared, quality index
| Numbering | 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 the method that provides of the present invention is obtained, drum strength, into
Product rate, usage factor are more preferable.
The reduction degree and low-temperature reduction disintegration energy for the sintering deposit that the embodiment of the present invention of table 3 and comparative example are prepared
From table 3 it can be seen that the RDI of Sinter for the mixture particle that the method that the present invention is provided is obtained
Reduction, sintering deposit reduction degree is improved.
As seen from the above embodiment, the invention provides a kind of granulation side of high-chromic vanadium-titanium ferroferrite sinter mixture
Method, comprises the following steps：(1) pelletized 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 pelletized, obtain compound
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, all it is directly added into present invention, avoiding high-chromic vanadium-titanium ferroferrite in compound to granulation property
The adverse effect of energy, and the ability for adhesion fine granules of returning mine is also improved, the balling property of compound is improved, and then can
The gas permeability of the bed of material during raising follow-up sintering, so as to reach the purpose for improving sintering deposit quality.
Above-described is only the preferred embodiment of the present invention, it is noted that for the ordinary skill of the art
For personnel, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (10)
1. a kind of method of granulating of high-chromic vanadium-titanium ferroferrite sinter mixture, comprises the following steps：
(1) pelletized 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 are pelletized, and 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%.
2. according to the method described in claim 1, it is characterised in that high-chromic vanadium-titanium ferroferrite is in pelletizing in the step (1)
In mass content be 90~93%；
Mass content of the quick lime in pelletizing is 3~5% in the step (1)；
Mass content of step (1) reclaimed water in pelletizing is 4~5%.
3. according to the method described in claim 1, it is characterised in that the granularity of the pelletizing is 1~3mm.
4. according to the method described in claim 1, it is characterised in that high-chromic vanadium-titanium ferroferrite and step in the step (1)
(2) mass ratio of high-chromic vanadium-titanium ferroferrite is (30~70) in：(70~30).
5. according to the method described in claim 1, it is characterised in that the flux is quick lime and/or lime stone.
6. according to the method described in claim 1, it is characterised in that the fuel is coke blacking and/or anchracite duff.
7. according to the method described in claim 1, it is characterised in that high-chromic vanadium-titanium ferroferrite is in mixing in the step (2)
It is 12~27% to expect the mass content in particle；
The mass content returned mine in the step (2) in mixture particle is 35~45%.
8. according to the method described in claim 1, it is characterised in that matter of the flux in mixture particle in the step (2)
It is 3.5~5.7% to measure content；
Mass content of the fuel in mixture particle is 4.0~4.3% in the step (2).
9. according to the method described in claim 1, it is characterised in that quality of step (2) reclaimed water in mixture particle
Content is 7.3~7.6%；
Mass content of the pelletizing in mixture particle is 13.5~30% in the step (2).
10. according to the method described in claim 1, it is characterised in that the composition of the high-chromic vanadium-titanium ferroferrite includes：
54.6~55.25wt% full iron；
28.1~30.96wt% FeO；
0.71~0.9wt% Cr2O3；
3.19~3.59wt% SiO2；
0.84~0.88wt% CaO；
2.59~2.97wt% Al2O3；
3.15~3.25wt% MgO；
0.58~0.61 V2O5；
11.6~11.81wt% TiO2；
0.009~0.01wt% P；
0.23~0.475wt% S.
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