CN109487074A - A kind of fluxed pellets mine and preparation method thereof with addition of the production of fluorine-containing magnetite concentrate - Google Patents
A kind of fluxed pellets mine and preparation method thereof with addition of the production of fluorine-containing magnetite concentrate Download PDFInfo
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- CN109487074A CN109487074A CN201811347162.7A CN201811347162A CN109487074A CN 109487074 A CN109487074 A CN 109487074A CN 201811347162 A CN201811347162 A CN 201811347162A CN 109487074 A CN109487074 A CN 109487074A
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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
- C22B1/02—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
- C22B1/26—Cooling of roasted, sintered, or agglomerated ores
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Abstract
The invention discloses a kind of fluxed pellets mines and preparation method thereof with addition of the production of fluorine-containing magnetite concentrate, the method of fluxed pellets mine and its technology controlling and process for the fluorine-containing magnetite concentrate production of drying grate-rotary kiln-circular cooler technology utilization, present invention determine that being suitable for drying grate-rotary kiln-circular cooler technique using drying, preheating, roasting and the cooling system of fluorine-containing magnetite concentrate production fluxed pellets mine, make pellet compression strength, drum strength and the metallurgical performance of production that can meet blast furnace demand.
Description
Technical field
The invention belongs to iron-smelting raw material pellet agglomeration technologies, more particularly to a kind of melting with addition of the production of fluorine-containing magnetite concentrate
It is fluorine-containing molten mainly to produce high-Mg low-Si by kind of drying grate-rotary kiln-circular cooler technique for agent pellet and preparation method thereof
Agent pellet and its technique.
Background technique
Sintering and two class of pelletizing prepare iron-smelting furnace charge main method in, the most significant advantage of pelletizing method be low energy consumption,
Small, product ferrous grade height is polluted, wherein acid pellet process energy consumption is only the half of sintering process energy consumption.Due to this of pelletizing
A little advantages, developed country greatly develop the production of pellet very early, and pellet ratio is gradually increased in iron-smelting furnace charge, have at present
A little blast furnaces even enter furnace ironmaking using global nodulizing.When pellet ratio improves, acidic pellet ore is difficult to meet blast furnace ironmaking
The alkaline components such as required calcium, magnesium.Therefore, external to begin to research addition dolomite, lime stone, magnesium olive in the sixties in last century
The fluxed pellets of olive stone find certain metallurgical performances of fluxed pellets better than acid pellet.Since the sixties in last century
Europe, North America and Japan and other countries begin to production and in blast furnace using fluxed and magnesium-containing pellets.
Due to history, high basicity sinter production scale is too big in China, adds although foring high basicity sinter
The burden structure of acidic pellet ore, but pellet ratio is insufficient so far, and the space for improving pellet basicity is limited, causes China molten
The development of agent pelletizing lags significantly behind other countries.In recent years, under the pressure of steel production energy-saving and emission-reduction, China's pellet
Production advance by leaps and bounds.As pellet enters continuing growing for furnace ratio, the condition for developing fluxed pellets reaches its maturity, China
The development of fluxed pellets is imperative.
Baogang's Bayan Obo iron ore concentrate and Mongolian concentrate SiO2 content are low, and especially Ba Run concentrate and Mongolian concentrate can be down to
1.5% or so, and CaO content and content of MgO are higher, this also gives is created based on the exploitation of Bayan Obo iron ore concentrate fluxed pellets
Extremely advantageous material condition.The natural alkalinity of the acid pellet of 100% Ba Run concentrate (little Xuan factory) preparation is 1.2, is suitable for making
For the iron charge for producing fluxed pellets.Data finding shows the domestic low SiO 2 content without finding peer-level, height
The iron ore of CaO, content of MgO carried out the commerical test of fluxed pellets, the fluxed pellets of production including Shoudu Iron and Steel Co and weight steel
Mine SiO2 content is 4% or more.
Summary of the invention
In order to solve the above-mentioned technical problem, the object of the present invention is to provide a kind of flux with addition of the production of fluorine-containing magnetite concentrate
Property pellet, by reasonable material matching, and determined and be suitable for drying grate-rotary kiln-circular cooler technique using fluorine-containing magnetic
Iron ore concentrate produces drying, preheating, roasting and the cooling system of fluxed pellets mine, and the pellet compression strength of production, rotary drum are strong
Degree and metallurgical performance can meet blast furnace demand.
In order to solve the above technical problems, the present invention adopts the following technical scheme:
A kind of fluxed pellets mine with addition of the production of fluorine-containing magnetite concentrate, raw material includes: fluorine-containing according to weight percent
Magnetite concentrate 85%~90%, floride-free magnetite concentrate 10%~15%, bentonite 2%, dolomite 4.5%-6.0%.
Further, in percentage by weight, the fluorine-containing magnetite concentrate is 90%, and the free-floride magnetite concentrate is
10%, bentonite 2%, dolomite 4.5%-6.0%.
Further, the chemical component of the fluorine-containing magnetite concentrate according to weight percent include: TFe be 65.5~
It is 0.60~0.80%, CaO is 1.70%~2.40%, Al2O3≤0.20% that 66.5%, FeO, which are 28.5~29.5%, MgO,
It is 0.65~1.05%, F is 0.25%~0.35%, K2O≤0.10% that SiO2, which is 0.80%~1.70%, S, Na2O≤
0.10%；Granularity≤0.074mm concentrate accounts for the percentage of the first iron ore concentrate total weight extremely in the fluorine-containing magnetite concentrate
It is less 95%.
Further, the chemical component of the floride-free magnetite concentrate according to weight percent include TFe be 65.0~
66.50%, FeO be 27.0%~29.0%, MgO be 0.50%~0.70%, CaO be 0.60%~0.75%, Al2O3 be≤
It is 0.10%~0.15%, F≤0.05% that 0.5%, SiO2, which are 4.50%~5.50%, S, K2O≤0.08%, Na2O≤
0.08%；Granularity≤0.074mm concentrate accounts for the percentage of the floride-free magnetite concentrate total weight in the free-floride magnetite concentrate
At least 80%.
Further, it is 62.0%~65.0% that the bentonitic chemical component, which includes SiO2 according to weight percent,
CaO is that 3.0%~3.5%, MgO is 1.0%~2.0%, Ig≤11%.
Further, it is 30.0%~33.0% that the chemical component of the dolomite, which includes CaO according to weight percent,
MgO is 19.0%~21.0%, Ig≤47%.
A kind of preparation method of the fluxed pellets mine with addition of the production of fluorine-containing magnetite concentrate, comprising the following steps:
S1, by the mixture, pelletizing obtains green-ball in Φ 6m balling disk (-sc), and green-ball is then passed through green-ball distribution device
And screening plant is uniformly layered on drying grate, drying grate green-ball is 1.95m/ with a thickness of 190mm~200mm, the machine speed of drying grate
Min~2.05m/min；
S2, green-ball is dried via drying grate blasting drying period and down-draft drying zone, the item of the blasting drying period
Part: the control of blasting drying period box temperature at 230 DEG C~250 DEG C, the control of blasting drying period the pressure of bellows 0.10kpa~
0.15kpa, for the control of blasting drying period petticoat pipe temperature at 50 DEG C~60 DEG C, the time is 2.90min~3.10min；The exhausting is dry
Dry section of condition: at 315 DEG C~340 DEG C, down-draft drying zone box temperature is controlled at 105 DEG C the control of down-draft drying zone petticoat pipe temperature
~120 DEG C, for the control of down-draft drying zone the pressure of bellows in -0.90kpa~-1.10kpa, the time is 5.90min~6.20min；
S3, dry bulb is preheated via two sections of drying grate preheated one-section and preheating, the condition of the preheated one-section: preheating
The control of one section of petticoat pipe temperature is at 640 DEG C~690 DEG C, and the control of preheated one-section box temperature is at 160 DEG C~190 DEG C, preheated one-section wind
For the control of case pressure in -0.90kpa~-1.10kpa, the time is 2.90min~3.10min；Two sections of petticoat pipe temperature controls are preheated to exist
960 DEG C~1000 DEG C, preheat the control of two sections of box temperatures at 470 DEG C~500 DEG C, preheat two sections of the pressure of bellows controls-
0.80kpa~-1.00kpa, time are 8.80min~9.20min；
S4, preheating ball warp is roasted by rotary kiln, the condition of the rotary kiln baking: rotary kiln speed control exists
0.90r/min~0.95r/min, the control of kiln hood temperature at 820 DEG C~890 DEG C, the control of kiln head cover temperature 1020 DEG C~
1090 DEG C, calcining time 35min~40min in kiln, coal-supplying amount 3.7t/h~3.9t/h；
S5, the roasting ball warp is subjected to cooling recrystallization, the process conditions of the ring cold machine: ring cold machine machine by ring cold machine
Speed control in 0.85m/min~0.90m/min, the control of Secondary Air temperature at 1050 DEG C~1100 DEG C, the control of Secondary Air pressure-
12kpa~-15kpa, the cold two sections of exhaust gas temperature control of ring is at 950 DEG C~1010 DEG C, and the cold three sections of exhaust gas temperature control of ring is at 450 DEG C
~550 DEG C, cooling time 40min~45min；Finished product fluxed pellets mine is finally obtained after roasting ball is cooling.
Further, in the step S1, the balling disk (-sc) process control parameter are as follows: green-ball moisture 8.0%~8.5%,
Ball disk tilt angle is 45 °~45.5 °, and shatter strength of green pellet reaches 5 times/P or more, and green-ball granularmetric composition is controlled in 11mm-
The ratio of 14mm reaches 95% or more, and wet rate of returning controls within 20%.
Further, in the step S3, the pre- hot-bulb quality control requirement: FeO content < 5.0%, S content <
0.70%, compression strength >=550N/P.
Further, in the step S4, ball quality control requirement: FeO content < 3.0%, S content < is roasted
0.40%, compression strength >=1600N/P；In the step S5, the finished product fluxed pellets mine quality control requirement: TFe >=
62.5%, FeO content < 0.5%, S content < 0.15%, content of MgO >=2.0%, SiO2 content≤3.0, F content≤
0.30%, RO >=1.0, compression strength >=2300N/P, drum strength >=95%, anti-wear index≤3%.
Compared with prior art, advantageous effects of the invention:
It realizes through the invention and produces superior in quality fluxed pellets mine with addition of fluorine-containing magnetite concentrate, with the technique
Pellet compression strength, drum strength and the metallurgical performance of production can meet blast furnace demand；
Improve pellet basicity simultaneously, effectively inhibit pellet under fluorine-containing magnetite concentrate conditions of mixture ratios at high proportion also
Former expansion rate improves reproducibility, optimizes Bf Burden, should develop fluxed pellets mine based on fluorine-containing magnetite concentrate, and realize
Its reasonable disposition in sintering and pelletizing process, improves blast furnace burden metallurgical performance.
The following further describes the present invention with reference to the drawings.
Detailed description of the invention
Fig. 1 is preparation flow figure of the invention.
Specific embodiment
A kind of fluxed pellets mine with addition of the production of fluorine-containing magnetite concentrate, raw material includes: fluorine-containing according to weight percent
Magnetite concentrate 85%~90%, floride-free magnetite concentrate 10%~15%, bentonite 2%, dolomite 4.5%-6.0%.
It is 65.5~66.5% that wherein the chemical component of the fluorine-containing magnetite concentrate, which includes: TFe according to weight percent,
It is 0.60~0.80%, CaO is 1.70%~2.40%, Al2O3≤0.20% that FeO, which is 28.5~29.5%, MgO, and SiO2 is
0.80%~1.70%, S are that 0.65~1.05%, F is 0.25%~0.35%, K2O≤0.10%, Na2O≤0.10%；Institute
It states the percentage that granularity≤0.074mm concentrate accounts for the first iron ore concentrate total weight in fluorine-containing magnetite concentrate and is at least 95%.
It is 65.0~66.50% that wherein the chemical component of the floride-free magnetite concentrate, which includes TFe according to weight percent,
It is 0.50%~0.70%, CaO be 0.60%~0.75%, Al2O3 is≤0.5% that FeO, which is 27.0%~29.0%, MgO,
SiO2 is that 4.50%~5.50%, S is 0.10%~0.15%, F≤0.05%, K2O≤0.08%, Na2O≤0.08%；Institute
It states granularity≤0.074mm concentrate in floride-free magnetite concentrate and accounts for the percentage of the floride-free magnetite concentrate total weight and be at least
80%.
It is that 62.0%~65.0%, CaO is that wherein the bentonitic chemical component, which includes SiO2 according to weight percent,
3.0%~3.5%, MgO are 1.0%~2.0%, Ig≤11%.
It is that 30.0%~33.0%, MgO is that wherein the chemical component of the dolomite, which includes CaO according to weight percent,
19.0%~21.0%, Ig≤47%.
As shown in Figure 1, a kind of preparation method of the fluxed pellets mine with addition of the production of fluorine-containing magnetite concentrate, including following step
It is rapid:
S1, by the mixture, pelletizing obtains green-ball in Φ 6m balling disk (-sc), and green-ball is then passed through green-ball distribution device
And screening plant is uniformly layered on drying grate, drying grate green-ball is 1.95m/ with a thickness of 190mm~200mm, the machine speed of drying grate
Min~2.05m/min；
S2, green-ball is dried via drying grate blasting drying period and down-draft drying zone, the item of the blasting drying period
Part: the control of blasting drying period box temperature at 230 DEG C~250 DEG C, the control of blasting drying period the pressure of bellows 0.10kpa~
0.15kpa, for the control of blasting drying period petticoat pipe temperature at 50 DEG C~60 DEG C, the time is 2.90min~3.10min；The exhausting is dry
Dry section of condition: at 315 DEG C~340 DEG C, down-draft drying zone box temperature is controlled at 105 DEG C the control of down-draft drying zone petticoat pipe temperature
~120 DEG C, for the control of down-draft drying zone the pressure of bellows in -0.90kpa~-1.10kpa, the time is 5.90min~6.20min；
S3, dry bulb is preheated via two sections of drying grate preheated one-section and preheating, the condition of the preheated one-section: preheating
The control of one section of petticoat pipe temperature is at 640 DEG C~690 DEG C, and the control of preheated one-section box temperature is at 160 DEG C~190 DEG C, preheated one-section wind
For the control of case pressure in -0.90kpa~-1.10kpa, the time is 2.90min~3.10min；Two sections of petticoat pipe temperature controls are preheated to exist
960 DEG C~1000 DEG C, preheat the control of two sections of box temperatures at 470 DEG C~500 DEG C, preheat two sections of the pressure of bellows controls-
0.80kpa~-1.00kpa, time are 8.80min~9.20min；
S4, preheating ball warp is roasted by rotary kiln, the condition of the rotary kiln baking: rotary kiln speed control exists
0.90r/min~0.95r/min, the control of kiln hood temperature at 820 DEG C~890 DEG C, the control of kiln head cover temperature 1020 DEG C~
1090 DEG C, calcining time 35min~40min in kiln, coal-supplying amount 3.7t/h~3.9t/h；
S5, the roasting ball warp is subjected to cooling recrystallization, the process conditions of the ring cold machine: ring cold machine machine by ring cold machine
Speed control in 0.85m/min~0.90m/min, the control of Secondary Air temperature at 1050 DEG C~1100 DEG C, the control of Secondary Air pressure-
12kpa~-15kpa, the cold two sections of exhaust gas temperature control of ring is at 950 DEG C~1010 DEG C, and the cold three sections of exhaust gas temperature control of ring is at 450 DEG C
~550 DEG C, cooling time 40min~45min；Finished product fluxed pellets mine is finally obtained after roasting ball is cooling.
Wherein in the step S1, the balling disk (-sc) process control parameter are as follows: green-ball moisture 8.0%~8.5%, ball disk incline
Rake angle is 45 °~45.5 °, and shatter strength of green pellet reaches 5 times/P or more, and green-ball granularmetric composition controls the ratio in 11mm-14mm
Example reaches 95% or more, and wet rate of returning controls within 20%.
Wherein in the step S3, the pre- hot-bulb quality control requirement: FeO content < 5.0%, S content < 0.70%,
Compression strength >=550N/P.
Wherein in the step S4, ball quality control requirement: FeO content < 3.0%, S content < 0.40%, resistance to compression is roasted
Intensity >=1600N/P；In the step S5, the finished product fluxed pellets mine quality control requirement: TFe >=62.5%, FeO contain
< 0.5%, S content < 0.15% are measured, content of MgO >=2.0%, SiO2 content≤3.0, F content≤0.30%, RO >=1.0 resist
Compressive Strength >=2300N/P, drum strength >=95%, anti-wear index≤3%.
Embodiment
The fluorine-containing fluxed pellets mine of the low high magnesium of silicon of drying grate-rotary kiln-circular cooler technique production, original are utilized in each embodiment
Material ingredient, raw material configuration, technological parameter, finished ball ingredient, finished ball correlated performance are shown in Table 1-7 respectively.
Each embodiment material chemical component of table 1 and grain size statistics
As shown in Table 1:
Iron charge kind used is more single in each embodiment, and fine size, ingredient stability is good, is conducive to improve pelletizing mistake
Journey.
Each embodiment raw material proportioning of table 2 statistics
Each embodiment quality of green pellets data statistics of table 3
As shown in Table 3:
(1) during the project implementation, increase the technical measures improvement with mixed wheel on the basis of original mixing facility by taking
The uniformity coefficient of raw material mixing；55% minibus was moistened into the technical measures regrinded by taking, improves quality of green pellets, was stablized
Green-ball moisture；By taking the measure of accurate adjustment roll screen spacing, it ensure that finished ball is provided with good granularmetric composition, work
During industry is tested, the control of green-ball moisture is stablized, and greenball properties are good, and pellet size composition is good.
(2) with addition of green-ball moisture after dolomite without significant change, and because mix size is thinner, bentonite ore ratio is in decline
Trend is minimum to drop to 1.9%.
(3) during the project implementation, green-ball quality is improved, and balling process stability is obviously improved, and wet rate of returning obviously drops
It is low, it can be stably maintained at 20% level, the requirement of drying grate-rotary kiln-circular cooler pelletizing production can be met.This is also turned out will certainly
The fine concentrate of production is extremely advantageous to improvement balling process and pellet quality for pelletizing production.
Each embodiment main technologic parameters of table 4 statistics
As shown in Table 4:
(1) during the project implementation, the dry section box temperature of drum is improved 20 DEG C, to guarantee that pelletizing is sufficiently dry, is reduced quick-fried
It splits, two sections of temperature will be preheated and improve 10 DEG C, to guarantee that dolomite sufficiently decomposes.Other technological parameters are without significant change.
(2) during the project implementation, there is no kiln hood chip off-falling phenomenon and serious ring formation of rotary kiln phenomenon, calcination atmosphere compared with
To be limpid, this illustrates that producing this kind of fluxed pellets not will be greatly shortened the ring formation of rotary kiln period.
(3) during the project implementation, injecting coal quantity rises to 22.7kg/t by the 19.5kg/t of production acid pellet in kiln, improves
About 16.7%, illustrate that producing high-quality fluxed pellets heat demand is promoted, this is primarily due to preheating with addition of after dolomite
Section decomposes a large amount of heat absorptions, while caused by furnace zone forms calcium ferrite, ferrous acid magnesium mineral also needs largely to absorb heat.The commerical test later period
Coal consumption is risen, and mainly due to kiln tail shovel flitch hanging block, drying grate backheat is insufficient, suitably increases injecting coal quantity.
(4) during the project implementation, each ring cold wind fan delivery and pressure are relatively stable, and there is no hardened existing in ring cold machine
As under also no discovery finished ball cooling is impermeable the phenomenon that red material, this illustrates to produce this kind of fluxed pellets to the cold technique of ring
It influences little.
Each embodiment finished ball chemical component of table 5 statistics
From table 5 analysis it can be seen that
(1) during the project implementation, finished ball chemical composition stability range: finished ball TFe is 62.5% or so, CaO content
For 3.5-3.8%, SiO2 content is 2.8-3.1%, and F content is 0.20%-0.30%, free basicity maintains essentially in 1.10 ±
0.5。
(2) during the project implementation, finished ball grade improves 0.35 percentage point, and SiO2 content reduces by 2.76 percentage points, S
Content increases 0.08 percentage point, and content of MgO increases 1.5 percentage points (theoretical calculation), and CaO content increases 2.23 percentages
Point.
Each embodiment finished ball cold strength of table 6 and reducing property statistics
As shown in Table 6:
(1) compression strength: pelletizing crushing strength mean value reaches 2450N/P during invention is implemented.
(2) drum strength: finished ball drum strength mean value reaches 96.41% during invention is implemented.
(3) reduction swellability rate: during invention is implemented, Swelling of Pellets During Reduction rate is all satisfied production requirement.Experimental period reduction is swollen
Swollen rate is more slightly higher than base period, but within 20%, reproducibility is greatly improved, and is increased to 55% by the 40% of acid pellet, mentions
It is about 15 percentage points high.
(4) fluxed pellets reduction and pulverization ratio (> 3.15mm, %) is 92.2%, substantially suitable with acid pellet.
(5) from the point of view of yield, mean value yield is higher during invention is implemented, and illustrates there there is set raw material proportioning during invention implementation
It is produced conducive to mentioning.
Gas cleaning main indicator situation counts during 7 commerical test of table
As shown in Table 7: during invention is implemented, there is no flue gas discharge beyond standards situations, meet environmental requirement.
Embodiment described above is only that preferred embodiment of the invention is described, and is not carried out to the scope of the present invention
It limits, without departing from the spirit of the design of the present invention, those of ordinary skill in the art make technical solution of the present invention
Various changes and improvements, should all fall into claims of the present invention determine protection scope in.
Claims (10)
1. a kind of fluxed pellets mine with addition of the production of fluorine-containing magnetite concentrate, which is characterized in that its raw material is according to weight percent
It include: fluorine-containing magnetite concentrate 85%~90%, floride-free magnetite concentrate 10%~15%, bentonite 2%, dolomite 4.5%-
6.0%.
2. the fluxed pellets mine according to claim 1 with addition of the production of fluorine-containing magnetite concentrate, which is characterized in that according to weight
Percentages are measured, the fluorine-containing magnetite concentrate is 90%, and the free-floride magnetite concentrate is 10%, bentonite 2%, dolomite
4.5%-6.0%.
3. the fluxed pellets mine according to claim 1 or 2 with addition of the production of fluorine-containing magnetite concentrate, which is characterized in that institute
State the chemical component of fluorine-containing magnetite concentrate according to weight percent include: TFe be 65.5~66.5%, FeO be 28.5~
It is 1.70%~2.40%, Al2O3≤0.20% that 29.5%, MgO, which are 0.60~0.80%, CaO, SiO2 is 0.80%~
1.70%, S are that 0.65~1.05%, F is 0.25%~0.35%, K2O≤0.10%, Na2O≤0.10%；The fluorine-containing magnetic
The percentage that granularity≤0.074mm concentrate accounts for the first iron ore concentrate total weight in iron ore concentrate is at least 95%.
4. the fluxed pellets mine according to claim 1 or 2 with addition of the production of fluorine-containing magnetite concentrate, which is characterized in that institute
State the chemical component of floride-free magnetite concentrate according to weight percent include TFe be 65.0~66.50%, FeO be 27.0%~
29.0%, MgO be 0.50%~0.70%, CaO be 0.60%~0.75%, Al2O3 be≤0.5%, SiO2 be 4.50%~
5.50%, S are 0.10%~0.15%, F≤0.05%, K2O≤0.08%, Na2O≤0.08%；The free-floride magnetite concentrate
The percentage that the concentrate of middle granularity≤0.074mm accounts for the floride-free magnetite concentrate total weight is at least 80%.
5. the fluxed pellets mine according to claim 1 or 2 with addition of the production of fluorine-containing magnetite concentrate, which is characterized in that institute
It is 62.0%~65.0%, CaO is 3.0%~3.5% that state bentonitic chemical component, which include SiO2 according to weight percent,
MgO is 1.0%~2.0%, Ig≤11%.
6. the fluxed pellets mine according to claim 1 or 2 with addition of the production of fluorine-containing magnetite concentrate, which is characterized in that institute
It is 30.0%~33.0%, MgO is 19.0%~21.0% that state the chemical component of dolomite, which include CaO according to weight percent,
Ig≤47%.
7. a kind of preparation method of the fluxed pellets mine with addition of the production of fluorine-containing magnetite concentrate, comprising the following steps:
S1, by the mixture, pelletizing obtains green-ball in Φ 6m balling disk (-sc), and green-ball is then passed through green-ball distribution device and sieve
Separating device is uniformly layered on drying grate, drying grate green-ball with a thickness of 190mm~200mm, the machine speed of drying grate be 1.95m/min~
2.05m/min；
S2, green-ball is dried via drying grate blasting drying period and down-draft drying zone, the condition of the blasting drying period: drum
At 230 DEG C~250 DEG C, blasting drying period the pressure of bellows is controlled in 0.10kpa~0.15kpa the control of wind dryer section box temperature,
For the control of blasting drying period petticoat pipe temperature at 50 DEG C~60 DEG C, the time is 2.90min~3.10min；The item of the down-draft drying zone
Part: at 315 DEG C~340 DEG C, down-draft drying zone box temperature is controlled at 105 DEG C~120 DEG C the control of down-draft drying zone petticoat pipe temperature,
For the control of down-draft drying zone the pressure of bellows in -0.90kpa~-1.10kpa, the time is 5.90min~6.20min；
S3, dry bulb is preheated via two sections of drying grate preheated one-section and preheating, the condition of the preheated one-section: preheated one-section
The control of petticoat pipe temperature is at 640 DEG C~690 DEG C, and the control of preheated one-section box temperature is at 160 DEG C~190 DEG C, preheated one-section bellows pressure
In -0.90kpa~-1.10kpa, the time is 2.90min~3.10min for power control；Two sections of petticoat pipe temperature controls are preheated at 960 DEG C
~1000 DEG C, preheat the control of two sections of box temperatures at 470 DEG C~500 DEG C, preheat two sections of the pressure of bellows controls -0.80kpa~-
1.00kpa, time are 8.80min~9.20min；
S4, preheating ball warp is roasted by rotary kiln, the condition of the rotary kiln baking: rotary kiln speed control is in 0.90r/
Min~0.95r/min, the control of kiln hood temperature is at 820 DEG C~890 DEG C, and the control of kiln head cover temperature is at 1020 DEG C~1090 DEG C, kiln
Interior calcining time 35min~40min, coal-supplying amount 3.7t/h~3.9t/h；
S5, the roasting ball warp is subjected to cooling recrystallization, the process conditions of the ring cold machine: ring cold machine machine speed control by ring cold machine
System in 0.85m/min~0.90m/min, the control of Secondary Air temperature at 1050 DEG C~1100 DEG C, the control of Secondary Air pressure-
12kpa~-15kpa, the cold two sections of exhaust gas temperature control of ring is at 950 DEG C~1010 DEG C, and the cold three sections of exhaust gas temperature control of ring is at 450 DEG C
~550 DEG C, cooling time 40min~45min；Finished product fluxed pellets mine is finally obtained after roasting ball is cooling.
8. the fluxed pellets mine according to claim 7 with addition of the production of fluorine-containing magnetite concentrate, which is characterized in that the step
In rapid S1, the balling disk (-sc) process control parameter are as follows: green-ball moisture 8.0%~8.5%, ball disk tilt angle is 45 °~
45.5 °, shatter strength of green pellet reaches 5 times/P or more, green-ball granularmetric composition control the ratio in 11mm-14mm reach 95% with
On, it is wet to return rate control within 20%.
9. the fluxed pellets mine according to claim 7 with addition of the production of fluorine-containing magnetite concentrate, which is characterized in that the step
In rapid S3, the pre- hot-bulb quality control requirement: FeO content < 5.0%, S content < 0.70%, compression strength >=550N/P.
10. the fluxed pellets mine according to claim 7 with addition of the production of fluorine-containing magnetite concentrate, which is characterized in that described
In step S4, ball quality control requirement: FeO content < 3.0%, S content < 0.40%, compression strength >=1600N/P is roasted；Institute
It states in step S5, the finished product fluxed pellets mine quality control requirement: TFe >=62.5%, FeO content < 0.5%, S content
< 0.15%, content of MgO >=2.0%, SiO2 content≤3.0, F content≤0.30%, RO >=1.0, compression strength >=2300N/
P, drum strength >=95%, anti-wear index≤3%.
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| CN110453067A (en) * | 2019-09-11 | 2019-11-15 | 中南大学 | A kind of preparation process of fluorine-containing iron ore agglomerates |
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| CN111647740A (en) * | 2020-06-28 | 2020-09-11 | 包头钢铁（集团）有限责任公司 | Contains K2O、Na2O, F method for preparing pellet by compounding iron ore concentrate with high-magnesium composite binder |
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| CN114085938A (en) * | 2021-11-16 | 2022-02-25 | 包头钢铁（集团）有限责任公司 | Process for smelting limestone type fluorine-containing fluxed pellets under high-pellet-ratio condition of large blast furnace |
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| CN110205486B (en) * | 2019-07-02 | 2021-03-12 | 重庆大学 | Preparation method of fluxed calcium ferrite |
| CN110453067A (en) * | 2019-09-11 | 2019-11-15 | 中南大学 | A kind of preparation process of fluorine-containing iron ore agglomerates |
| CN110484722A (en) * | 2019-09-11 | 2019-11-22 | 中南大学 | A method of improving fluorine-containing iron ore pellet roasting performance |
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| CN111647740B (en) * | 2020-06-28 | 2022-03-22 | 包头钢铁（集团）有限责任公司 | Contains K2O、Na2O, F method for preparing pellet by compounding iron ore concentrate with high-magnesium composite binder |
| CN112391523A (en) * | 2020-07-21 | 2021-02-23 | 华北理工大学 | High SiO2Roasting control method for process of flux pellet rotary kiln |
| CN112195339A (en) * | 2020-09-22 | 2021-01-08 | 包头钢铁（集团）有限责任公司 | Contains K2O、Na2O, F pellet prepared by using magnetite concentrate as main material and combining with hematite concentrate and preparation method thereof |
| CN113736992A (en) * | 2021-08-18 | 2021-12-03 | 包头钢铁（集团）有限责任公司 | Limestone type fluxed pellet produced by adding fluorine-containing magnetite concentrate and preparation method thereof |
| CN114085938A (en) * | 2021-11-16 | 2022-02-25 | 包头钢铁（集团）有限责任公司 | Process for smelting limestone type fluorine-containing fluxed pellets under high-pellet-ratio condition of large blast furnace |
| CN115305345A (en) * | 2022-08-04 | 2022-11-08 | 武钢集团昆明钢铁股份有限公司 | Quality-guaranteeing and emission-reducing roasting method for pellets under all-coke-gas denitration facility-free condition |
| CN115305345B (en) * | 2022-08-04 | 2023-04-18 | 武钢集团昆明钢铁股份有限公司 | Quality-guaranteeing and emission-reducing roasting method for pellets under all-coke-gas denitration facility-free condition |
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Effective date of registration: 20211206 Address after: 014400 bigertu village, Xianfeng Town, ulateqian banner, Bayannur City, Inner Mongolia Autonomous Region Patentee after: Inner Mongolia Baogang reduced iron Co.,Ltd. Address before: 014010 Hexi Industrial Zone, Kunqu District, Baotou, the Inner Mongolia Autonomous Region Patentee before: BAOTOU IRON & STEEL (GROUP) Co.,Ltd. |