CN107267748B - A kind of high vanadium high-chromic vanadium-titanium ferroferrite pelletizing - Google Patents
A kind of high vanadium high-chromic vanadium-titanium ferroferrite pelletizing Download PDFInfo
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- CN107267748B CN107267748B CN201710448511.3A CN201710448511A CN107267748B CN 107267748 B CN107267748 B CN 107267748B CN 201710448511 A CN201710448511 A CN 201710448511A CN 107267748 B CN107267748 B CN 107267748B
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- vanadium
- chromic
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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
-
- 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
- C22B1/02—Roasting processes
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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 high vanadium high-chromic vanadium-titanium ferroferrite pelletizing, belongs to the technical field of blast furnace process in high vanadium high-chromic vanadium-titanium ferroferrite method of comprehensive utilization.The high vanadium high-chromic vanadium-titanium ferroferrite pelletizing, including chemical composition and its mass percent be：V2O5：0.45~0.62%, TiO2：2.29~3.20%, Cr2O3：0.22~0.48%, TFe：61.88~64.22%, CaO：0.11~0.63%, SiO2：3.18~4.77%, MgO：0.32~0.89%, Al2O3：1.62~4.0%, surplus is inevitable impurity；Wherein, in TFe, Fe2O3It is that account for pellet quality percentage be 0.3~0.8% to 87.51~91.41%, FeO to account for pellet quality percentage.The raw material proportioning of pelletizing use is prepared, bentonite ore ratio reduces by 1% or more, and pellet grade is improved；Quality of green pellets is efficiently and effectively improved, ensure that pellet yield and quality.
Description
Technical field
The invention belongs to the technical field of blast furnace process in high vanadium high-chromic vanadium-titanium ferroferrite method of comprehensive utilization, especially relate to
And a kind of high vanadium high-chromic vanadium-titanium ferroferrite pelletizing.
Background technology
As domestic iron ore supply demand gap increasingly becomes larger, iron and steel enterprise is badly in need of expanding the source of iron ore deposit and exploitation is high
Added value vanadium chromium product, import Foreign iron ore resource become a kind of trend, and the high vanadium high-chromic vanadium-titanium ferroferrite of import is a kind of
More metal intergrowth minerals rich in a variety of valuable constituent elements such as iron, vanadium, titanium, chromium, application value are high.In the prior art, import is high
There are coarse sizes for vanadium high-chromic vanadium-titanium ferroferrite, and balling-up is poor, and bentonite disappears when preparing high vanadium high-chromic vanadium-titanium ferroferrite pelletizing
The problems such as consumption is big is unsuitable for the existing pellet forming process for domestic Iron Ore Powder, also, the thickness of granularity directly affects pelletizing
Quality, the high vanadium high-chromic vanadium-titanium ferroferrite powder iron ore Powder Particle Size of import is thicker, and in balling process, balling-up is poor, coarse size, than
Surface area is small, is unfavorable for pelletizing oxidation, and attachment force is small between roasting process chats particle, and pellet strength is low.Using prior art system
Manufacturing technique requirent is not achieved in standby pelletizing green-ball granularity, shatter strength of green pellet and compression strength of green pel let, finally influences pellet
Yield and quality.To influence the improvement of blast furnace process index and the raising of ironmaking technology.
Invention content
The problem to be solved in the present invention is, using the high vanadium high-chromic vanadium-titanium ferroferrite pelletizing of prior art preparation, there are grains
Degree is thick, balling-up is poor, consumption of bentonite amount big disadvantage when preparing high vanadium high-chromic vanadium-titanium ferroferrite pelletizing, provided by the invention
A kind of high vanadium high-chromic vanadium-titanium ferroferrite pelletizing uses the high vanadium high-chromic vanadium-titanium ferroferrite of import for raw material, and matches in raw material
Than in, bentonite ore ratio reduces by 1% or more, and pellet grade is largely improved；Efficiently and effectively improve green-ball
Quality ensure that pellet yield and quality.
The present invention a kind of high vanadium high-chromic vanadium-titanium ferroferrite pelletizing, it includes TFe be 61.88~64.22wt.%,
Including chemical composition and its mass percent be：Fe2O3：87.51~91.41%, FeO：0.3~0.8%, V2O5：0.45~
0.62%, TiO2：2.29~3.20%, Cr2O3：0.22~0.48%, CaO：0.11~0.63%, SiO2：3.18~
4.77%, MgO：0.32~0.89%, Al2O3：1.62~4.0%, surplus is inevitable impurity；
High vanadium high-chromic vanadium-titanium ferroferrite pelletizing is by high vanadium high-chromic vanadium-titanium ferroferrite powder, iron charge and the bentonite after profit mill
It is prepared, wherein the weight part ratio of each ingredient is：
High vanadium high-chromic vanadium-titanium ferroferrite powder after profit mill：51~56 parts, iron charge：44~49 parts, bentonite：0.8~1.1
Part；
High vanadium high-chromic vanadium-titanium ferroferrite powder after the profit mill is that the high vanadium high-chromic vanadium-titanium ferroferrite of import is moistened
Grind the high vanadium high-chromic vanadium-titanium ferroferrite powder that obtained fineness is -200 mesh >=90%, it includes TFe be 61~63wt.%,
Including chemical composition and its mass percent be：FeO：26~28%, Fe3O4：54.06~58.97%, V2O5：0.9~
1.1%, TiO2：4.5~5.5%, Cr2O3：0.45~0.85%, CaO：0.16~0.26%, SiO2：2~3%, MgO：0.5
~1.0%, Al2O3：2.5~4.0%, surplus is inevitable impurity；
The ingredient and its parts by weight that the iron charge contains be：Common Iron Ore Powder：70~100 parts；Common superfine iron powder：
0~30 part；
Wherein, grain size≤0.5mm of common Iron Ore Powder accounts for 90%, and its maximum particle diameter≤3mm；
The fineness of common superfine iron powder is -325 mesh >=85% or -200 mesh >=95%；
The mesh of the bentonitic granularity≤200, the ingredient and its mass percent contained are：SiO2：66~69%,
Al2O3：13~16%, MgO：4~5%, CaO：2~3%, Na2O≤1.7%, K2O≤1.2%, surplus are inevitably miscellaneous
Matter.
The green-ball granularity of the high vanadium high-chromic vanadium-titanium ferroferrite pelletizing prepared is 8~16mm, and shatter strength of green pellet is >=4
Secondary/, compression strength >=10N/, the compression strength for drying the high vanadium high-chromic vanadium-titanium ferroferrite pelletizing of pre-oxidation is >=
300N/, the compression strength of the high vanadium high-chromic vanadium-titanium ferroferrite pelletizing after roasting is >=2200N/, the reduction swellability of pelletizing
Rate≤16.4%.
The preparation method of above-mentioned high vanadium high-chromic vanadium-titanium ferroferrite pelletizing, is realized by following steps：Moisten mill, dispensing,
Drying mixing plus bottom water batch mixing, stewing material, pelletizing, green-ball screening, drying pre-oxidation, shaft roasting, cooling, the specific steps are：
Step 1, profit mill
High vanadium high-chromic vanadium-titanium ferroferrite is subjected to profit mill, profit time consuming is 5~15min, and the high vanadium being made after profit mill is high
Chromic vanadium-titanium ferroferrite powder, fineness are -200 mesh >=90%；
The described profit mill uses damp mill, wherein the technological parameter of damp mill is：Cylinder number of moving part be 14.3~
The material ball ratio of 21.95r/min, damp mill is：(3.4~11.3)：(24~83)；
Step 2, dispensing
According to the raw material composition and its weight part ratio of high vanadium high-chromic vanadium-titanium ferroferrite pelletizing, raw material is weighed, mixing is equal
It is even, obtain mixed material；
Step 3, it dries
It is 6~8% that mixed material, which is dried to mixed material moisture content, the mixed material after being dried；
Step 4, add bottom water batch mixing, stewing material
Water is added in mixed material after drying, and is uniformly mixed, 30~50min of material is then boiled in a covered pot over a slow fire, obtains the material boiled in a covered pot over a slow fire；Its
In, the amount that water is added is 1.8~2.2% of the mixed material quality after drying；
Step 5, pelletizing and screening
The material boiled in a covered pot over a slow fire is placed in disc balling machine, water is added so that high vanadium high-chromic vanadium-titanium ferroferrite green-ball moisture content
Control carries out pelletizing 9~11%, by screening, obtains the high vanadium high-chromic vanadium-titanium ferroferrite green-ball that granularity is 8~16mm；
Step 6, drying pre-oxidation
By the high vanadium high-chromic vanadium-titanium ferroferrite green-ball that granularity is 8~16mm, vertical furnace is uniformly distributed by material distributing machine
In drying bed at top, the pre- thermal oxide of drying and dewatering is passed through in drying bed, obtains the high vanadium high-chromic vanadium titanium of drying pre-oxidation
Magnetite Pellets, wherein drying bed tempertaure control is 650~750 DEG C, the control of petticoat pipe temperature is 160~210 DEG C, thickness of feed layer
Control is 100~140mm, drying time is 5~9min；
Step 7, shaft roasting
The high vanadium high-chromic vanadium-titanium ferroferrite pelletizing of drying pre-oxidation is placed in shaft furnace and is roasted, after being roasted
High vanadium high-chromic vanadium-titanium ferroferrite pelletizing；Its roasting technique is：Chamber temperature is 1150~1250 DEG C, chamber pressure 7
~11kPa, gas pressure are 18~20kPa, combustion-supporting wind pressure is 16~18kPa, and roasting time is 10~18min；
Step 8, cooling
By the high vanadium high-chromic vanadium-titanium ferroferrite pelletizing after roasting, after furnace cooling, it is discharged from vertical furnace bottom, obtains high vanadium
High-chromic vanadium-titanium ferroferrite pelletizing.
In the step 3, the drying concrete operation method is：Mixed material is placed in drying box, 90~
110 DEG C are dried, until mixed material moisture content is 6~8%.
In the step 4, the mode of the addition water is using atomization plus water.
In the step 4, the stewing material refers to the mixed material that water is added with polybag or plastic paper covering, purpose
It is, moisture is made to be uniformly mixed.
In the step 5, the screening is specially roll screen, is specially by high vanadium Gao Ge made from disc balling machine
Type vanadium titano-magnetite green-ball is sieved by the gap between sieving roller, and granularity is the high vanadium chromium type high v-ti magnetite of 8~16mm
Mine green-ball enters next step, and high vanadium high-chromic vanadium-titanium ferroferrite green-ball of the granularity less than 8mm is back to the disk pelletizing of step 5
Machine continues pelletizing, and high vanadium high-chromic vanadium-titanium ferroferrite green-ball of the granularity more than 16mm is back to step 5 by being broken into miberal powder
Disc balling machine pelletizing.
The yield of the high vanadium high-chromic vanadium-titanium ferroferrite pelletizing reaches 1500 ton days.
The high vanadium high-chromic vanadium-titanium ferroferrite pelletizing is for the high vanadium high-chromic vanadium-titanium ferroferrite of blast furnace process import
Furnace charge.
A kind of high vanadium high-chromic vanadium-titanium ferroferrite pelletizing of the present invention, compared with the prior art, advantage is：
1. a kind of high vanadium high-chromic vanadium-titanium ferroferrite pelletizing of the present invention grinds the high vanadium chromium type high v-ti magnetite of import by profit
Mine mixes common Iron Ore Powder and common superfine iron powder, adjustment bentonite ore ratio appropriate, solves the high vanadium Gao Ge of import well
Type vanadium titano-magnetite granularity is excessively thick, and balling-up is poor, consumption of bentonite amount is big when preparing high vanadium high-chromic vanadium-titanium ferroferrite pelletizing
Disadvantage；By moistening mill so that mixture grade averagely improves 8% or more, bentonite ore ratio reduces by 1% or more, and pellet grade obtains
To largely improving；Quality of green pellets is efficiently and effectively improved, ensure that pellet yield and quality；
2. by setting rational calcination temperature, V containing vanadium is reached in the case of realizing pellet stable components2O5：0.45
~0.62%, TiO2：2.29~3.20%, Cr2O3：0.22~0.48%, meet the high vanadium high-chromic vanadium titanium of blast furnace process import
The requirement of magnetic iron ore.
3. during preparing high vanadium high-chromic vanadium-titanium ferroferrite pelletizing in the present invention, it is advantageous to add bottom water and the benefit of stewing material
Preparation in pelletizing and yield and quality that is uniform, and then improving pelletizing, and bring prodigious side for subsequent shaft roasting
Just, furthermore be conducive to the more excellent pelletizing of processability.
4. by moistening the change of mill and raw material proportioning etc. in the present invention, in pelletizing mineral powder granular bonding state more closely,
Microstructure is more uniformly distributed densification, so that high vanadium high-chromic vanadium-titanium ferroferrite pellet characteristics are significantly improved,
Including higher shatter strength of green pellet, higher compression strength of green pel let, higher acid pellet compression strength, and acid pellet
The metallurgical performances such as reduction swellability, reproducibility and soft melting dropping characteristic are more excellent.
Specific implementation mode
With reference to embodiment, the present invention is described in further detail.
High vanadium high-chromic vanadium-titanium ferroferrite used in following embodiment comes from Russian Ural area.
High vanadium high-chromic vanadium-titanium ferroferrite used in following embodiment, it includes TFe be 61~63wt.%, including
Chemical composition and its mass percent are：FeO：26~28%, Fe3O4：54.06~58.97%, V2O5：0.9~1.1%,
TiO2：4.5~5.5%, Cr2O3：0.45~0.85%, CaO：0.16~0.26%, SiO2：2~3%, MgO：0.5~
1.0%, Al2O3：2.5~4.0%, surplus is inevitable impurity；
Common Iron Ore Powder used in following embodiment, it includes TFe be 63~65wt.%, including chemical composition and its
Mass percent is：FeO：22~28%, Fe3O4：56.82~66.03%, CaO：0.06~1.0%, SiO2：5~6%,
MgO：0.14~0.74%, Al2O3：1~4%, surplus is inevitable impurity.
Common superfine iron powder used in following embodiment, it includes TFe be 65~69wt.%, including chemical composition
And its mass percent is：FeO：23~27%, Fe3O4：60.66~70.48%, CaO：0.1~0.2%, SiO2：4~8%,
MgO：0.15~0.35%, Al2O3：0.05~0.35%, surplus is inevitable impurity.
Bentonite used in following embodiment is commercial products, and the ingredient and its mass percent contained is：SiO2：66
~69%, Al2O3：13~16%, MgO：4~5%, CaO：2~3%, Na2O≤1.7%, K2O≤1.2%, surplus is can not
The impurity avoided.
Technical solution of the present invention is not limited to act specific implementation mode set forth below, further includes between each specific implementation mode
Arbitrary combination.
Embodiment 1
A kind of high vanadium high-chromic vanadium-titanium ferroferrite pelletizing, it includes TFe be 64.22wt.%, including chemical composition and
Its mass percent is：Fe2O3：91.41%, FeO：0.3%, V2O5：0.45%, TiO2：2.29%, Cr2O3：0.22%,
CaO：0.11%, SiO2：3.18%, MgO：0.32%, Al2O3：1.62%, surplus is inevitable impurity；
High vanadium high-chromic vanadium-titanium ferroferrite pelletizing is by high vanadium high-chromic vanadium-titanium ferroferrite powder, iron charge and the bentonite after profit mill
It is prepared, wherein the weight part ratio of each ingredient is：
High vanadium high-chromic vanadium-titanium ferroferrite powder after profit mill：51 parts, iron charge：49 parts, bentonite：0.8 part；
High vanadium high-chromic vanadium-titanium ferroferrite powder after the profit mill is that the high vanadium high-chromic vanadium-titanium ferroferrite of import is moistened
Grind the high vanadium high-chromic vanadium-titanium ferroferrite powder that obtained fineness is -200 mesh >=90%；
The ingredient and its parts by weight that the iron charge contains be：Common Iron Ore Powder：70 parts；Common superfine iron powder：30 parts；
Wherein, grain size≤0.5mm of common Iron Ore Powder accounts for 90%, and its maximum particle diameter≤3mm；
The fineness of common superfine iron powder is -325 mesh >=85% or -200 mesh >=95%；
The mesh of the bentonitic granularity≤200；
The preparation method of the high vanadium high-chromic vanadium-titanium ferroferrite pelletizing of the present embodiment, is realized by following steps：Profit mill is matched
Material, drying mixing plus bottom water batch mixing, stewing material, pelletizing, green-ball screening, drying pre-oxidation, shaft roasting, cooling, specific steps
For：
Step 1, profit mill
High vanadium high-chromic vanadium-titanium ferroferrite is subjected to profit mill, profit time consuming is 15min, and the high vanadium chromium type high after profit mill is made
V-ti magnetite miberal powder, fineness are -200 mesh >=90%；
The described profit mill uses damp mill, wherein the technological parameter of damp mill is：The specification of damp mill is MR3254, outside
Shape size is 13.4m × 7.25m × 5.7m, cylinder internal diameter 3.2m, cylinder active length 5.4m, cylinder available capacity
39.5m3, cylinder number of moving part are 16.5r/min, and the maximum loading of damp mill is material 6t, steel ball 44t；
Step 2, dispensing
According to the raw material composition and its weight part ratio of high vanadium high-chromic vanadium-titanium ferroferrite pelletizing, raw material is weighed, mixing is equal
It is even, obtain mixed material；
Step 3, it dries
Mixed material is placed in drying box, is dried at 90 DEG C, until mixed material moisture content is 8%, is dried
Mixed material after dry；
Step 4, add bottom water batch mixing, stewing material
Water is added by the way of atomization plus water in mixed material after drying, and is uniformly mixed, is then covered with polybag
The mixed material of water is added in lid, boils in a covered pot over a slow fire material 30min, obtains the material boiled in a covered pot over a slow fire；Wherein, the amount that water is added is the mixed material matter after drying
The 2% of amount；
Step 5, pelletizing and screening
The material boiled in a covered pot over a slow fire is placed in disc balling machine, water is added so that high vanadium high-chromic vanadium-titanium ferroferrite green-ball moisture content
Control carries out pelletizing 11%, by screening, obtains the high vanadium high-chromic vanadium-titanium ferroferrite green-ball that granularity is 8~10mm；
The screening is specially roll screen, is specially to give birth to high vanadium high-chromic vanadium-titanium ferroferrite made from disc balling machine
Ball is sieved by the gap between sieving roller, and the high vanadium high-chromic vanadium-titanium ferroferrite green-ball that granularity is 8~10mm enters next
Step, the disc balling machine that high vanadium high-chromic vanadium-titanium ferroferrite green-ball of the granularity less than 8mm is back to step 5 continue pelletizing, grain
High vanadium high-chromic vanadium-titanium ferroferrite green-ball of the degree more than 10mm by being broken into miberal powder, make by the disc balling machine for being back to step 5
Ball.
Prepare high vanadium high-chromic vanadium-titanium ferroferrite pelletizing green-ball granularity be 8~10mm, shatter strength of green pellet be 6 times/
It is a, compression strength 15N/.
Step 6, drying pre-oxidation
By the high vanadium high-chromic vanadium-titanium ferroferrite green-ball that granularity is 8~10mm, vertical furnace is uniformly distributed by material distributing machine
In drying bed at top, the pre- thermal oxide of drying and dewatering is passed through in drying bed, obtains the high vanadium high-chromic vanadium titanium of drying pre-oxidation
Magnetite Pellets, wherein drying bed tempertaure control is 750 DEG C, the control of petticoat pipe temperature is 210 DEG C, thickness of feed layer control is
140mm, drying time 9min；
The compression strength for drying the high vanadium high-chromic vanadium-titanium ferroferrite pelletizing of pre-oxidation is 400N/.
Step 7, shaft roasting
The high vanadium high-chromic vanadium-titanium ferroferrite pelletizing of drying pre-oxidation is placed in shaft furnace and is roasted, after being roasted
High vanadium high-chromic vanadium-titanium ferroferrite pelletizing；Its roasting technique is：Chamber temperature is 1250 DEG C, chamber pressure 7kPa, coal
Atmospheric pressure is 20kPa, combustion-supporting wind pressure is 18kPa, roasting time 10min；
Step 8, cooling
By the high vanadium high-chromic vanadium-titanium ferroferrite pelletizing after roasting, after furnace cooling, it is discharged from vertical furnace bottom, obtains high vanadium
High-chromic vanadium-titanium ferroferrite pelletizing.
The compression strength of high vanadium high-chromic vanadium-titanium ferroferrite pelletizing after roasting is 2500N/, and reduction swellability rate is
11.9%.
Embodiment 2
A kind of high vanadium high-chromic vanadium-titanium ferroferrite pelletizing, it includes TFe be 62.42wt.%, including chemical composition and
Its mass percent is：Fe2O3：88.84%, FeO：0.30%, V2O5：0.47%, TiO2：3.10%, Cr2O3：0.35%,
CaO：0.11%, SiO2：4.77%, MgO：0.32%, Al2O3：1.62%, surplus is inevitable impurity.
High vanadium high-chromic vanadium-titanium ferroferrite pelletizing is by high vanadium high-chromic vanadium-titanium ferroferrite powder, iron charge and the bentonite after profit mill
It is prepared, wherein the weight part ratio of each ingredient is：
High vanadium high-chromic vanadium-titanium ferroferrite powder after profit mill：54 parts, iron charge：46 parts, bentonite：1.0 part；
High vanadium high-chromic vanadium-titanium ferroferrite powder after the profit mill is that the high vanadium high-chromic vanadium-titanium ferroferrite of import is moistened
Grind the high vanadium high-chromic vanadium-titanium ferroferrite powder that obtained fineness is -200 mesh >=90%；
The ingredient and its parts by weight that the iron charge contains be：Common Iron Ore Powder：100 parts；Wherein, common Iron Ore Powder
Grain size≤0.5mm's accounts for 90%, and its maximum particle diameter≤3mm；
The mesh of the bentonitic granularity≤200；
The preparation method of the high vanadium high-chromic vanadium-titanium ferroferrite pelletizing of the present embodiment, is realized by following steps：Profit mill is matched
Material, drying mixing plus bottom water batch mixing, stewing material, pelletizing, green-ball screening, drying pre-oxidation, shaft roasting, cooling, specific steps
For：
Step 1, profit mill
High vanadium high-chromic vanadium-titanium ferroferrite is subjected to profit mill, profit time consuming is 8min, and the high vanadium chromium type high after profit mill is made
V-ti magnetite miberal powder, fineness are -200 mesh >=90%；
The described profit mill uses damp mill, wherein the technological parameter of damp mill is：The specification of damp mill is MR3870, outside
Shape size is 16.4m × 8.74m × 7.59m, cylinder internal diameter 3.8m, cylinder active length 7.0m, cylinder available capacity
73.6m3, cylinder number of moving part is 14.3r/min, and the maximum loading of damp mill is material 11.3t, steel ball 83t；
Step 2, dispensing
According to the raw material composition and its weight part ratio of high vanadium high-chromic vanadium-titanium ferroferrite pelletizing, raw material is weighed, mixing is equal
It is even, obtain mixed material；
Step 3, it dries
Mixed material is placed in drying box, is dried at 110 DEG C, until mixed material moisture content is 6%, is dried
Mixed material after dry；
Step 4, add bottom water batch mixing, stewing material
Water is added by the way of atomization plus water in mixed material after drying, and is uniformly mixed, is then covered with polybag
The mixed material of water is added in lid, boils in a covered pot over a slow fire material 30min, obtains the material boiled in a covered pot over a slow fire；Wherein, the amount that water is added is the mixed material matter after drying
The 2% of amount；
Step 5, pelletizing and screening
The material boiled in a covered pot over a slow fire is placed in disc balling machine, water is added so that high vanadium high-chromic vanadium-titanium ferroferrite green-ball moisture content
Control carries out pelletizing 9%, by screening, obtains the high vanadium high-chromic vanadium-titanium ferroferrite green-ball that granularity is 9~15mm；
The screening is specially roll screen, is specially to give birth to high vanadium high-chromic vanadium-titanium ferroferrite made from disc balling machine
Ball is sieved by the gap between sieving roller, and the high vanadium high-chromic vanadium-titanium ferroferrite green-ball that granularity is 9~15mm enters next
Step, the disc balling machine that high vanadium high-chromic vanadium-titanium ferroferrite green-ball of the granularity less than 9mm is back to step 5 continue pelletizing, grain
High vanadium high-chromic vanadium-titanium ferroferrite green-ball of the degree more than 15mm by being broken into miberal powder, make by the disc balling machine for being back to step 5
Ball.
Prepare high vanadium high-chromic vanadium-titanium ferroferrite pelletizing green-ball granularity be 9~15mm, shatter strength of green pellet be 4 times/
It is a, compression strength 11.6N/.
Step 6, drying pre-oxidation
By the high vanadium high-chromic vanadium-titanium ferroferrite green-ball that granularity is 9~15mm, vertical furnace is uniformly distributed by material distributing machine
In drying bed at top, the pre- thermal oxide of drying and dewatering is passed through in drying bed, obtains the high vanadium high-chromic vanadium titanium of drying pre-oxidation
Magnetite Pellets, wherein drying bed tempertaure control is 650 DEG C, the control of petticoat pipe temperature is 160 DEG C, thickness of feed layer control is
100mm, drying time 5min；
The compression strength for drying the high vanadium high-chromic vanadium-titanium ferroferrite pelletizing of pre-oxidation is 330N/.
Step 7, shaft roasting
The high vanadium high-chromic vanadium-titanium ferroferrite pelletizing of drying pre-oxidation is placed in shaft furnace and is roasted, after being roasted
High vanadium high-chromic vanadium-titanium ferroferrite pelletizing；Its roasting technique is：Chamber temperature is 1150 DEG C, chamber pressure 7kPa, coal
Atmospheric pressure is 18kPa, combustion-supporting wind pressure is 16kPa, roasting time 18min；
Step 8, cooling
By the high vanadium high-chromic vanadium-titanium ferroferrite pelletizing after roasting, after furnace cooling, it is discharged from vertical furnace bottom, obtains high vanadium
High-chromic vanadium-titanium ferroferrite pelletizing.
The compression strength of high vanadium high-chromic vanadium-titanium ferroferrite pelletizing after roasting is 2260N/, and reduction swellability rate is
13.8%.
Present embodiment uses disk blanking machine blanking, ensures each disk blanking accuracy, adheres to running disk system, ensures iron
Expect that every 15 minutes running disks detection is primary, fluctuation range is within ± 0.5kg/m；The every 25 minutes running disks detection of bentonite is primary, often
Secondary running disk five times, is averaged, and fluctuation range is within ± 0.02kg/m.
Embodiment 3
A kind of high vanadium high-chromic vanadium-titanium ferroferrite pelletizing, it includes TFe be 63.18wt.%, including chemical composition and
Its mass percent is：Fe2O3：89.79%, FeO：0.47%, V2O5：0.48%, TiO2：2.56%, Cr2O3：0.29%,
CaO：0.22%, SiO2：3.32%, MgO：0.89%, Al2O3：1.96%, surplus is inevitable impurity.
High vanadium high-chromic vanadium-titanium ferroferrite pelletizing is by high vanadium high-chromic vanadium-titanium ferroferrite powder, iron charge and the bentonite after profit mill
It is prepared, wherein the weight part ratio of each ingredient is：
High vanadium high-chromic vanadium-titanium ferroferrite powder after profit mill：52 parts, iron charge：48 parts, bentonite：0.9 part；
High vanadium high-chromic vanadium-titanium ferroferrite powder after the profit mill is that the high vanadium high-chromic vanadium-titanium ferroferrite of import is moistened
Grind the high vanadium high-chromic vanadium-titanium ferroferrite powder that obtained fineness is -200 mesh >=90%；
The ingredient and its parts by weight that the iron charge contains be：Common Iron Ore Powder：70 parts, common superfine iron powder：30 parts；
Wherein, grain size≤0.5mm of common Iron Ore Powder accounts for 90%, and its maximum particle diameter≤3mm；The fineness of common superfine iron powder is-
200 mesh >=95%；
The mesh of the bentonitic granularity≤200；
The preparation method of the high vanadium high-chromic vanadium-titanium ferroferrite pelletizing of the present embodiment, is realized by following steps：Profit mill is matched
Material, drying mixing plus bottom water batch mixing, stewing material, pelletizing, green-ball screening, drying pre-oxidation, shaft roasting, cooling, specific steps
For：
Step 1, profit mill
High vanadium high-chromic vanadium-titanium ferroferrite is subjected to profit mill, profit time consuming is 10min, and the high vanadium chromium type high after profit mill is made
V-ti magnetite miberal powder, fineness are -200 mesh >=90%；
The described profit mill uses damp mill, wherein the technological parameter of damp mill is：The specification of damp mill is MR2265, outside
Shape size is 10.97m × 5.62m × 4.05m, cylinder internal diameter 2.2m, cylinder active length 6.5m, cylinder available capacity
21.4m3, cylinder number of moving part are 21.95r/min, and the maximum loading of damp mill is material 3.4t, steel ball 24t；
Step 2, dispensing
According to the raw material composition and its weight part ratio of high vanadium high-chromic vanadium-titanium ferroferrite pelletizing, raw material is weighed, mixing is equal
It is even, obtain mixed material；
Step 3, it dries
Mixed material is placed in drying box, is dried at 110 DEG C, until mixed material moisture content is 7%, is dried
Mixed material after dry；
Step 4, add bottom water batch mixing, stewing material
Water is added by the way of atomization plus water in mixed material after drying, and is uniformly mixed, is then covered with polybag
The mixed material of water is added in lid, boils in a covered pot over a slow fire material 40min, obtains the material boiled in a covered pot over a slow fire；Wherein, the amount that water is added is the mixed material matter after drying
The 2.2% of amount；
Step 5, pelletizing and screening
The material boiled in a covered pot over a slow fire is placed in disc balling machine, water is added so that high vanadium high-chromic vanadium-titanium ferroferrite green-ball moisture content
Control carries out pelletizing 10%, by screening, obtains the high vanadium high-chromic vanadium-titanium ferroferrite green-ball that granularity is 9~16mm；
The screening is specially roll screen, is specially to give birth to high vanadium high-chromic vanadium-titanium ferroferrite made from disc balling machine
Ball is sieved by the gap between sieving roller, and the high vanadium high-chromic vanadium-titanium ferroferrite green-ball that granularity is 9~16mm enters next
Step, the disc balling machine that high vanadium high-chromic vanadium-titanium ferroferrite green-ball of the granularity less than 9mm is back to step 5 continue pelletizing, grain
High vanadium high-chromic vanadium-titanium ferroferrite green-ball of the degree more than 16mm by being broken into miberal powder, make by the disc balling machine for being back to step 5
Ball.
Prepare high vanadium high-chromic vanadium-titanium ferroferrite pelletizing green-ball granularity be 9~16mm, shatter strength of green pellet be 5 times/
It is a, compression strength 12N/.
Step 6, drying pre-oxidation
By granularity being uniformly distributed by material distributing machine in the drying bed at shaft furnace furnace roof for 9~16mm, in drying bed
By the pre- thermal oxide of drying and dewatering, the high vanadium high-chromic vanadium-titanium ferroferrite pelletizing of drying pre-oxidation is obtained, wherein drying bed tempertaure
Control is 750 DEG C, the control of petticoat pipe temperature is 210 DEG C, thickness of feed layer control is 140mm, drying time 9min；
The compression strength for drying the high vanadium high-chromic vanadium-titanium ferroferrite pelletizing of pre-oxidation is 360N/.
Step 7, shaft roasting
The high vanadium high-chromic vanadium-titanium ferroferrite pelletizing of drying pre-oxidation is placed in shaft furnace and is roasted, after being roasted
High vanadium high-chromic vanadium-titanium ferroferrite pelletizing；Its roasting technique is：Chamber temperature is 1250 DEG C, chamber pressure 11kPa, coal
Atmospheric pressure is 20kPa, combustion-supporting wind pressure is 18kPa, roasting time 10min；
Step 8, cooling
By the high vanadium high-chromic vanadium-titanium ferroferrite pelletizing after roasting, after furnace cooling, it is discharged from vertical furnace bottom, obtains high vanadium
High-chromic vanadium-titanium ferroferrite pelletizing.
The compression strength of high vanadium high-chromic vanadium-titanium ferroferrite pelletizing after roasting is 2410N/, and reduction swellability rate is
12.8%.
Embodiment 4
A kind of high vanadium high-chromic vanadium-titanium ferroferrite pelletizing, it includes TFe be 61.88wt.%, including chemical composition and
Its mass percent is：Fe2O3：87.51%, FeO：0.8%, V2O5：0.62%, TiO2：3.20%, Cr2O3：0.48%,
CaO：0.63%, SiO2：3.25%, MgO：0.34%, Al2O3：3.06%, surplus is inevitable impurity.
High vanadium high-chromic vanadium-titanium ferroferrite pelletizing is by high vanadium high-chromic vanadium-titanium ferroferrite powder, iron charge and the bentonite after profit mill
It is prepared, wherein the weight part ratio of each ingredient is：
High vanadium high-chromic vanadium-titanium ferroferrite powder after profit mill：56 parts, iron charge：44 parts, bentonite：1.1 part；
High vanadium high-chromic vanadium-titanium ferroferrite powder after the profit mill is that the high vanadium high-chromic vanadium-titanium ferroferrite of import is moistened
Grind the high vanadium high-chromic vanadium-titanium ferroferrite powder that obtained fineness is -200 mesh >=90%；
The ingredient and its parts by weight that the iron charge contains be：Common Iron Ore Powder：85 parts, common superfine iron powder：15 parts；
Wherein, grain size≤0.5mm of common Iron Ore Powder accounts for 90%, and its maximum particle diameter≤3mm；The fineness of common superfine iron powder is-
200 mesh >=95%；
The mesh of the bentonitic granularity≤200；
The preparation method of the high vanadium high-chromic vanadium-titanium ferroferrite pelletizing of the present embodiment, is realized by following steps：Profit mill is matched
Material, drying mixing plus bottom water batch mixing, stewing material, pelletizing, green-ball screening, drying pre-oxidation, shaft roasting, cooling, specific steps
For：
Step 1, profit mill
High vanadium high-chromic vanadium-titanium ferroferrite is subjected to profit mill, profit time consuming is 5min, and the high vanadium chromium type high after profit mill is made
V-ti magnetite miberal powder, fineness are -200 mesh >=90%；
The described profit mill uses damp mill, wherein the technological parameter of damp mill is：The specification of damp mill is MR3254, outside
Shape size is 13.4m × 7.25m × 5.7m, cylinder internal diameter 3.2m, cylinder active length 5.4m, cylinder available capacity
39.5m3, cylinder number of moving part is 16.5r/min, and the maximum loading of damp mill is material 6t, steel ball 44t；
Step 2, dispensing
According to the raw material composition and its weight part ratio of high vanadium high-chromic vanadium-titanium ferroferrite pelletizing, raw material is weighed, mixing is equal
It is even, obtain mixed material；
Step 3, it dries
Mixed material is placed in drying box, is dried at 110 DEG C, until mixed material moisture content is 8%, is dried
Mixed material after dry；
Step 4, add bottom water batch mixing, stewing material
Water is added by the way of atomization plus water in mixed material after drying, and is uniformly mixed, is then covered with polybag
The mixed material of water is added in lid, boils in a covered pot over a slow fire material 50min, obtains the material boiled in a covered pot over a slow fire；Wherein, the amount that water is added is the mixed material matter after drying
The 1.8% of amount；
Step 5, pelletizing and screening
The material boiled in a covered pot over a slow fire is placed in disc balling machine, water is added so that high vanadium high-chromic vanadium-titanium ferroferrite green-ball moisture content
Control carries out pelletizing 11%, by screening, obtains the high vanadium high-chromic vanadium-titanium ferroferrite green-ball that granularity is 8~15mm；
The screening is specially roll screen, is specially to give birth to high vanadium high-chromic vanadium-titanium ferroferrite made from disc balling machine
Ball is sieved by the gap between sieving roller, and the high vanadium high-chromic vanadium-titanium ferroferrite green-ball that granularity is 8~15mm enters next
Step, the disc balling machine that high vanadium high-chromic vanadium-titanium ferroferrite green-ball of the granularity less than 8mm is back to step 5 continue pelletizing, grain
High vanadium high-chromic vanadium-titanium ferroferrite green-ball of the degree more than 15mm by being broken into miberal powder, make by the disc balling machine for being back to step 5
Ball.
Prepare high vanadium high-chromic vanadium-titanium ferroferrite pelletizing green-ball granularity be 8~15mm, shatter strength of green pellet be 4 times/
It is a, compression strength 10N/.
Step 6, drying pre-oxidation
By granularity being uniformly distributed by material distributing machine in the drying bed at shaft furnace furnace roof for 8~15mm, in drying bed
By the pre- thermal oxide of drying and dewatering, the high vanadium high-chromic vanadium-titanium ferroferrite pelletizing of drying pre-oxidation is obtained, wherein drying bed tempertaure
Control is 700 DEG C, the control of petticoat pipe temperature is 190 DEG C, thickness of feed layer control is 120mm, drying time 7min；
The compression strength for drying the high vanadium high-chromic vanadium-titanium ferroferrite pelletizing of pre-oxidation is 300N/.
Step 7, shaft roasting
The high vanadium high-chromic vanadium-titanium ferroferrite pelletizing of drying pre-oxidation is placed in shaft furnace and is roasted, after being roasted
High vanadium high-chromic vanadium-titanium ferroferrite pelletizing；Its roasting technique is：Chamber temperature is 1200 DEG C, chamber pressure 9kPa, coal
Atmospheric pressure is 19kPa, combustion-supporting wind pressure is 17kPa, roasting time 14min；
Step 8, cooling
By the high vanadium high-chromic vanadium-titanium ferroferrite pelletizing after roasting, after furnace cooling, it is discharged from vertical furnace bottom, obtains high vanadium
High-chromic vanadium-titanium ferroferrite pelletizing.
The compression strength of high vanadium high-chromic vanadium-titanium ferroferrite pelletizing after roasting is 2200N/, and reduction swellability rate is
16.4%.
Comparative example
A kind of high vanadium high-chromic vanadium-titanium ferroferrite pelletizing, it includes TFe be 63.28wt.%, including chemical composition and
Its mass percent is：Fe2O3：89.79%, FeO：0.47%, V2O5：0.48%, TiO2：2.86%, Cr2O3：0.27%,
CaO：0.22%, SiO2：3.26%, MgO：0.53%, Al2O3：1.92%, surplus is inevitable impurity.
High vanadium high-chromic vanadium-titanium ferroferrite pelletizing is by untreated high vanadium high-chromic vanadium-titanium ferroferrite powder, iron charge and swollen
Profit soil is prepared, wherein the weight part ratio of each ingredient is：
Untreated high vanadium high-chromic vanadium-titanium ferroferrite powder：53 parts, iron charge：47 parts, bentonite：1.0 part；
The ingredient and its parts by weight that the iron charge contains be：Common Iron Ore Powder：70 parts, common superfine iron powder：30 parts；
Wherein, grain size≤0.5mm of common Iron Ore Powder accounts for 90%, and its maximum particle diameter≤3mm；The fineness of common superfine iron powder is-
200 mesh >=95%；
The mesh of the bentonitic granularity≤200；
The preparation method of the high vanadium high-chromic vanadium-titanium ferroferrite pelletizing of the present embodiment, is realized by following steps：Dispensing, baking
Dry-mixing plus bottom water batch mixing, stewing material, pelletizing, green-ball screening, drying pre-oxidation, shaft roasting, cooling, the specific steps are：
Step 1, dispensing
According to the raw material composition and its weight part ratio of high vanadium high-chromic vanadium-titanium ferroferrite pelletizing, raw material is weighed, mixing is equal
It is even, obtain mixed material；
Step 2, it dries
Mixed material is placed in drying box, is dried at 110 DEG C, until mixed material moisture content is 7%, is dried
Mixed material after dry；
Step 3, add bottom water batch mixing, stewing material
Water is added by the way of atomization plus water in mixed material after drying, and is uniformly mixed, is then covered with polybag
The mixed material of water is added in lid, boils in a covered pot over a slow fire material 40min, obtains the material boiled in a covered pot over a slow fire；Wherein, the amount that water is added is the mixed material matter after drying
The 2.2% of amount；
Step 4, pelletizing and screening
The material boiled in a covered pot over a slow fire is placed in disc balling machine, water is added so that high vanadium high-chromic vanadium-titanium ferroferrite green-ball moisture content
Control carries out pelletizing 10%, by screening, obtains the high vanadium high-chromic vanadium-titanium ferroferrite green-ball that granularity is 9~16mm；
The screening is specially roll screen, is specially to give birth to high vanadium high-chromic vanadium-titanium ferroferrite made from disc balling machine
Ball is sieved by the gap between sieving roller, and the high vanadium high-chromic vanadium-titanium ferroferrite green-ball that granularity is 9~16mm enters next
Step, the disc balling machine that high vanadium high-chromic vanadium-titanium ferroferrite green-ball of the granularity less than 9mm is back to step 5 continue pelletizing, grain
High vanadium high-chromic vanadium-titanium ferroferrite green-ball of the degree more than 16mm by being broken into miberal powder, make by the disc balling machine for being back to step 5
Ball.
Prepare high vanadium high-chromic vanadium-titanium ferroferrite pelletizing green-ball granularity be 6~12mm, shatter strength of green pellet be 2 times/
It is a, compression strength 7N/.
Step 5, drying pre-oxidation
By granularity being uniformly distributed by material distributing machine in the drying bed at shaft furnace furnace roof for 9~16mm, in drying bed
By the pre- thermal oxide of drying and dewatering, the high vanadium high-chromic vanadium-titanium ferroferrite pelletizing of drying pre-oxidation is obtained, wherein drying bed tempertaure
Control is 750 DEG C, the control of petticoat pipe temperature is 210 DEG C, thickness of feed layer control is 140mm, drying time 9min；
The compression strength for drying the high vanadium high-chromic vanadium-titanium ferroferrite pelletizing of pre-oxidation is 200N/.
Step 6, shaft roasting
The high vanadium high-chromic vanadium-titanium ferroferrite pelletizing of drying pre-oxidation is placed in shaft furnace and is roasted, after being roasted
High vanadium high-chromic vanadium-titanium ferroferrite pelletizing；Its roasting technique is：Chamber temperature is 1250 DEG C, chamber pressure 11kPa, coal
Atmospheric pressure is 20kPa, combustion-supporting wind pressure is 18kPa, roasting time 10min；
Step 7, cooling
By the high vanadium high-chromic vanadium-titanium ferroferrite pelletizing after roasting, after furnace cooling, it is discharged from vertical furnace bottom, obtains high vanadium
High-chromic vanadium-titanium ferroferrite pelletizing.
The compression strength of high vanadium high-chromic vanadium-titanium ferroferrite pelletizing after roasting is 1520N/, and reduction swellability rate is
25%.
Claims (3)
1. a kind of high vanadium high-chromic vanadium-titanium ferroferrite pelletizing, which is characterized in that the high vanadium high-chromic vanadium-titanium ferroferrite pelletizing includes
TFe be 61.88 ~ 64.22wt.%, including chemical composition and its mass percent be：Fe2O3：87.51 ~ 91.41%, FeO：
0.3 ~ 0.8%, V2O5：0.45 ~ 0.62%, TiO2：2.29 ~ 3.20%, Cr2O3：0.22 ~ 0.48%, CaO：0.11 ~ 0.63%, SiO2：
3.18 ~ 4.77%, MgO：0.32 ~ 0.89%, Al2O3：1.62 ~ 4.0%, surplus is inevitable impurity；
Wherein, high vanadium high-chromic vanadium-titanium ferroferrite powder, iron charge and swelling after high vanadium high-chromic vanadium-titanium ferroferrite pelletizing is ground by profit
Soil is prepared, wherein the weight part ratio of each ingredient is：
High vanadium high-chromic vanadium-titanium ferroferrite powder after profit mill：51 ~ 56 parts, iron charge：44 ~ 49 parts, bentonite：0.8 ~ 1.1 part；
High vanadium high-chromic vanadium-titanium ferroferrite powder after the described profit mill is that the high vanadium high-chromic vanadium-titanium ferroferrite of import carries out profit and grinds
The fineness arrived be -200 mesh >=90% high vanadium high-chromic vanadium-titanium ferroferrite powder, it includes TFe be 61 ~ 63wt.%, including change
It studies point and its mass percent is：FeO：26 ~ 28%, Fe3O4：54.06 ~ 58.97%, V2O5：0.9 ~ 1.1%, TiO2：4.5~
5.5%, Cr2O3：0.45 ~ 0.85%, CaO：0.16 ~ 0.26%, SiO2：2 ~ 3%, MgO：0.5 ~ 1.0%, Al2O3：2.5 ~ 4.0%, surplus
For inevitable impurity；
The ingredient and its parts by weight that the iron charge contains be：Common Iron Ore Powder：70 ~ 100 parts；Common superfine iron powder：0~30
Part；
Wherein, grain size≤0.5mm of common Iron Ore Powder accounts for 90%, and its maximum particle diameter≤3mm；
The fineness of common superfine iron powder is -325 mesh >=85% or -200 mesh >=95%.
2. high vanadium high-chromic vanadium-titanium ferroferrite pelletizing as described in claim 1, which is characterized in that the high vanadium high-chromic vanadium of preparation
The green-ball granularity of titanomagnetite pelletizing is 8 ~ 16mm, and shatter strength of green pellet is >=4 times/, and compression strength >=10N/, drying is pre-
The compression strength of the high vanadium high-chromic vanadium-titanium ferroferrite pelletizing of oxidation is >=300N/, the high vanadium high-chromic vanadium titanium magnetic after roasting
The compression strength of iron ore pellets is >=2200N/, reduction swellability rate≤16.4% of pelletizing.
3. high vanadium high-chromic vanadium-titanium ferroferrite pelletizing as described in claim 1, which is characterized in that the bentonitic granularity
≤ 200 mesh, the ingredient and its mass percent contained are：SiO2：66 ~ 69%, Al2O3：13 ~ 16%, MgO：4 ~ 5%, CaO：2~
3%, Na2O≤1.7%, K2O≤1.2%, surplus are inevitable impurity.
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| PCT/CN2018/088043 WO2018228156A1 (en) | 2017-06-14 | 2018-05-23 | High-vanadium and high-chromium type vanadium-titanium magnetite pellet |
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| CN107287412B (en) * | 2017-06-14 | 2018-10-23 | 东北大学 | A kind of preparation method of high vanadium high-chromic vanadium-titanium ferroferrite pelletizing |
| CN109852790B (en) * | 2019-02-01 | 2020-04-14 | 东北大学 | Method for preparing chromium-containing full vanadium-titanium self-fluxing pellet with medium and low alkalinity |
| CN114410960B (en) * | 2021-12-17 | 2023-12-12 | 萍乡市众邦冶金有限公司 | Pellet production process for steel smelting |
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