CN107868871A - A kind of iron ore pellets containing charcoal and preparation method thereof - Google Patents
A kind of iron ore pellets containing charcoal and preparation method thereof Download PDFInfo
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- CN107868871A CN107868871A CN201710888013.0A CN201710888013A CN107868871A CN 107868871 A CN107868871 A CN 107868871A CN 201710888013 A CN201710888013 A CN 201710888013A CN 107868871 A CN107868871 A CN 107868871A
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- iron ore
- charcoal
- internal layer
- mixed material
- 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
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/242—Binding; Briquetting ; Granulating with binders
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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
The present invention relates to a kind of iron ore pellets containing charcoal and preparation method thereof, Iron Ore Powder, charcoal, binding agent and water are well mixed, form mixed material A；Iron Ore Powder, binding agent and water are well mixed, form mixed material B；Mixed material A is first added on pelletizer internal layer spheroid is made, then add mixed material B, form the outer layer of cladding internal layer spheroid, that is, obtain the iron ore pellets containing charcoal of the structure containing bilayer sphere；Control a diameter of D of internal layer spheroid1, D1For 8~10mm, a diameter of D of pelletizing2, D2‑D1For 1~4mm and D2≤12mm；The mass ratio of the carbon of charcoal and the oxygen element of Iron Ore Powder is (0.95~1.3) in internal layer spheroid:1；The mass ratio of the carbon of charcoal and the oxygen element of Iron Ore Powder is (0.63~0.85) in pelletizing:1.Charcoal pelletizing green-ball test prepared by the present invention, obtain compression strength, drop strength and burst temperature and be well positioned to meet self reduction pellet production.Present invention process is simple, and production cost is low, environment-friendly, has good industrial prospect.
Description
Technical field
The invention belongs to field of steel metallurgy, and in particular to a kind of iron ore pellets containing charcoal and preparation method thereof.
Background technology
According to statistics, blast furnace iron-making process energy consumption accounts for the 50% of integrated iron and steel works' total energy consumption, and caused carbon dioxide is about
Account for the 70% of industry carbon dioxide total release.In recent years, with the continuous improvement of environmental requirement, traditional blast furnace iron-making process
Development face lot of challenges, to seek the sustainable development of Ferrous Metallurgy, non-blast furnace ironmaking such as direct reduction iron making technique into
For study hotspot.Compared with gas base directly reducing, coal-based direct reduction is adapted to the fuel characteristic distributions of the few gas of the more coals in China, at me
State causes extensive concern.Carbonaceous pelletizing have reduction rate is very fast, chemical composition stability, metallurgical performance are good, size uniform, life
The features such as yield is high, it is adapted to the different grade iron ores of processing, meets that China's rich ore is few, the resource structures requirement more than lean ore.With it is carbon containing
Fine ore is compared, and carbonaceous pelletizing can overcome bed permeability variation in fine ore reduction process, furnace inner environment deterioration, reduction rate slow etc.
Shortcoming, thus as the important source material of direct reduction iron making.But carbonaceous pelletizing typically uses coal dust as fuel and gone back at present
Former agent, fail effectively to change the raw material mix using fossil fuel, it is a large amount of can not fundamentally to solve ironmaking processes carbon dioxide
Emission problem.
In recent years, biomass is heated to the organic of the stabilization of acquisition under 300-1000 DEG C of isolation air or low oxygen concentration
Carbon compound-charcoal (O/C ﹤ 0.6) turns into the focus of technical research as the main source of " carbon " of carbonaceous pelletizing.Biology
Charcoal is a kind of excellent replacement fossil energy and reducing agent, and not only with the features such as gasification efficiency height, reduction rate is fast, it is made
Standby raw material charcoal wide material sources are simultaneously renewable.Common charcoal source includes rice husk, maize straw, peanut shell, boll hull, saw
The agricultural wastes such as end, wood chip and timber processed side product.Fuel and reducing agent are used as by the use of charcoal, on the one hand, not only not
Can additionally increase air in carbon dioxide, and due in charcoal harmful element (such as S, P) content it is low, can stablize and subtract
Pernicious gas (such as SO in few ironmaking processes2) discharge；On the other hand, be advantageous to the management and control of biological waste, can solve
Due to the haze weather problem that agriculture is burned in rural area, woods discarded object produces a large amount of gases and aerosol components and brought.It is clear that
Charcoal has unique advantage as pelletizing composition, and research iron ore pellets containing charcoal are for realizing green low consumption Ferrous Metallurgy
Significance of Sustainable Development it is great.
Need repeatedly to transport in pellet production process, it then becomes necessary to which the green-ball for ensureing to create has necessarily
Resistance to compression and drop strength (require that iron ore pellets compression strength is more than 8N/, drop strength is more than 3 times/(0.5m in production
It is individual).But charcoal and traditional fossil fuel such as coal dust etc. are very different, its hydrophily is weak, at the same with Iron Ore Powder it
Between adhesion it is weak, the problems such as the generally existing of iron ore pellets containing the charcoal resistance to compression that causes to produce, drop strength are low.
The content of the invention
In view of the shortcomings of the prior art, the present invention is intended to provide a kind of high intensity with bilayer sphere structure, mixed carbon comtent
Low iron ore pellets containing charcoal and preparation method thereof.
One kind iron ore pellets containing charcoal of the invention, the pelletizing have internal layer spheroid and coat the outer of the internal layer spheroid
Layer, a diameter of D of internal layer spheroid1, D1For 8~10mm, a diameter of D of pelletizing2, D2-D1For 1~4mm and D2≤12mm；
The internal layer spheroid is made up of Iron Ore Powder, charcoal, binding agent, water；The carbon member of charcoal in the internal layer spheroid
The mass ratio of element and the oxygen element of Iron Ore Powder is (0.95~1.3):1；
The outer layer is made up of Iron Ore Powder, binding agent, water,
The mass ratio of the carbon of charcoal and the oxygen element of Iron Ore Powder is (0.63~0.85) in the pelletizing:1.
Preferably, a kind of iron ore pellets containing charcoal of the present invention, the D1For 9~10mm, D2-D1For 1~3mm and it is D2
≤12mm；The mass ratio of the carbon of charcoal and the oxygen element of Iron Ore Powder is (0.95~1.05) in the internal layer spheroid:1；
The mass ratio of the carbon of charcoal and the oxygen element of Iron Ore Powder is (0.63~0.7) in the pelletizing:1.
Preferably, a kind of iron ore pellets containing charcoal of the present invention, the binding agent in the internal layer spheroid are bentonite, swelling
The content of soil is 2.5~3.5wt% of Iron Ore Powder quality in internal layer spheroid；Binding agent in the outer layer is bentonite, swelling
The content of soil is 2.5~3.5wt% of Iron Ore Powder quality in internal layer spheroid, and the content of the internal layer spheroid reclaimed water is internal layer spheroid
6~7wt% of quality, the content of the outer layer reclaimed water are 6~7wt% of outer layer quality, the Iron Ore Powder in the internal layer spheroid
For magnetite powder, the Iron Ore Powder in the outer layer is magnetite powder.
One kind iron ore pellets containing charcoal of the invention, the compression strength of green pel let of iron ore pellets containing charcoal for 8.6~
11.4N/, drop strength is 5.5~9.6 times/(0.5m), burst temperature is 400~430 DEG C.In a preferred approach, institute
The compression strength of green pel let of iron ore pellets containing charcoal is stated as 9.7~11.4N/, drop strength is 8.7~9.6 times/(0.5m
It is individual), burst temperature is 400~430 DEG C
A kind of preparation method of the iron ore pellets containing charcoal of the present invention, comprises the following steps：
Iron Ore Powder, charcoal, binding agent and water are well mixed, form mixed material A；By Iron Ore Powder, binding agent and water
It is well mixed, form mixed material B；Mixed material A is first added on pelletizer internal layer spheroid is made, then add mixed material
B, the outer layer of cladding internal layer spheroid is formed, that is, obtain the pelletizing of the structure containing bilayer sphere；
In the mixed material A, the mass ratio of the carbon of charcoal and the oxygen element of Iron Ore Powder is (0.95~1.3):
1；
In the pelletizing, the mass ratio of the carbon of charcoal and the oxygen element of Iron Ore Powder is (0.63~0.85):1；
The internal layer spheroid is D1, D1For 8~10mm, a diameter of D of pelletizing2, D2-D1For 1~4mm and D2≤12mm。
A kind of preparation method of the iron ore pellets containing charcoal of the present invention, the Iron Ore Powder is magnetite powder.Preferably, it is described
In magnetite powder 93% and the particle diameter of the above be less than 0.074mm, its specific surface area >=1716cm2/g。
A kind of preparation method of the iron ore pellets containing charcoal of the present invention, the composition composition of the charcoal are counted in mass ratio：
Fixed carbon is 80.45wt%, ash content 4.48wt%, and volatilization is divided into 15.07wt%.
A kind of preparation method of the iron ore pellets containing charcoal of the present invention, in the charcoal 95% and the particle diameter of the above be less than
0.074mm。
A kind of preparation method of the iron ore pellets containing charcoal of the present invention, described binding agent is bentonite.Preferably, it is described
In mixed material A, bentonitic content is 2.5~3.5wt% of Iron Ore Powder quality, bentonitic to contain in the mixed material B
Measure as 2.5~3.5wt% of Iron Ore Powder quality.As further preferably, in the mixture A, bentonitic content is iron
In 3~3.5wt% of powdered ore quality, the mixed material B, bentonitic 3~3.5wt% for Iron Ore Powder quality.
A kind of preparation method of the iron ore pellets containing charcoal of the present invention, the content of the mixed material A reclaimed waters is mixture
Expect 6~7wt% of A mass, the content of the mixed material B reclaimed waters is 6~7wt% of mixed material B mass.
A kind of preparation method of the iron ore pellets containing charcoal of the present invention, the mode of the mixing include profit and ground；The profit mill
Time be 4~6min, profit mill rotating speed be 500~600r/min.
Preferably, a kind of preparation method of the iron ore pellets containing charcoal of the present invention, in the mixed material A, charcoal
The mass ratio of carbon and the oxygen element of Iron Ore Powder is (0.95~1.05):1；In the pelletizing, the carbon and iron of charcoal
The mass ratio of the oxygen element of miberal powder is (0.63~0.7):1.
Preferably, a kind of preparation method of the iron ore pellets containing charcoal of the present invention, the D1For 9~10mm, D2-D1For 1~
3mm and be D2≤12mm。
A kind of preparation method of the iron ore pellets containing charcoal of the present invention, internal layer is made in addition mixed material A on pelletizer
The nucleation time of spheroid is 2~3min, and the time that internal layer spheroid is grown up is 3~4min, and outer layer time of growing up is 1~2min, ball
Group's close temporal is 2~3min.Preferably, the nucleation time of internal layer spheroid is 3min, and the time that internal layer spheroid is grown up is 4min,
Outer layer time of growing up is 2min, and pelletizing close temporal is 3min.
The present invention has following good effect compared with prior art：
Invention significantly improves the mechanical property containing biological carbon pellets.Charcoal is due to hydrophily decrease and Iron Ore Powder
Between adhesion it is weak, will generally cause the resistance to compression of the green-ball of iron ore pellets containing charcoal, drop strength relatively low.Present invention design is double-deck
The poor charcoal of the weaker adhesion between Iron Ore Powder of hydrophily is uniformly distributed in internal layer pelletizing by sphere structure, optimize technique
In；Outer layer is wrapped up internal layer pelletizing with the Iron Ore Powder compound without charcoal, forms the bilayer of charcoal element selective distribution
Pelletizing, and by cooperate with ectonexine and overall carbon-to-oxygen ratio, diameter or thickness, mixture moisture, close temporal, on the one hand from structure
On by reduce the direct contact surface between Iron Ore Powder and charcoal accumulate, on the other hand, from technique optimize pelletizing composition and
Forming process, under final collaboration, the overall compactness of the iron ore pellets containing charcoal is improved, has haveed the function that synergy, significantly
Improve the resistance to compression containing biological pelletizing and drop strength.It is provided by the present invention to allow the charcoal iron ore pellets compression strength of green pel let to be
8.6~11.4N/, drop strength is 5.5~9.6 times/(0.5m), burst temperature is 400~430 DEG C.In preferred scheme
In, the compression strength of green pel let of iron ore pellets containing charcoal is 9.7~11.4N/, drop strength is 8.7~9.6 times/
(0.5m), burst temperature are 400~430 DEG C.
It is provided by the present invention allow pelletizing carbon amount of allocating it is low, due to the present invention by charcoal selectivity be distributed in interior layers of balls
In, in the reducing roasting process of pelletizing, pelletizing internal oxygen content is low, charcoal imperfect combustion, generates carbon monoxide, whole
Individual reducing roasting process is gas-solid indirect reduction process, drastically increases reduction rate, meanwhile, caused by the reaction of pelletizing internal layer
Carbon monoxide improves the probability that Iron Ore Powder contacts with carbon monoxide, so as to improve during being spread toward pelletizing outer layer
The utilization rate of carbon monoxide, reduce the amount of allocating of carbon in iron ore pellets., can be further thus in actual reduction process
Reduction ironmaking processes carbon dioxide discharge.
The present invention replaces traditional fossil fuel coal etc. to be used as carbon containing iron ore pellets using the charcoal of wide material sources, environmental protection
Reducing agent, natural resources is sufficiently make use of, reduce environmental pollution, simultaneously because the amount of allocating of pelletizing carbon reduces, produced
During, can further it reduce environmental pollution, thus the present invention reduces environmental pollution from raw material into application process,
Other present invention process is simple, working condition is easily controllable, and adaptability to raw material is strong, it is easy to accomplish industrialized production, thus this hair
It is bright that there is good economic benefit and social benefit.
The present invention has the characteristics of technique is simple, and production cost is low, environment-friendly.The iron ore containing charcoal being prepared is double
Layer pelletizing can be good at meeting the requirement to greenball properties during pelletizing production.For the extensive work of the iron ore pellets containing charcoal
Industry application is laid a good foundation, and has good industrial prospect.
Embodiment
With reference to specific embodiment, the present invention is described in further detail, it is clear that described embodiment is only
It is part of the embodiment of the present invention, rather than whole embodiments, based on the embodiment in the present invention, ordinary skill people
The every other embodiment that member is obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
The composition composition of charcoal used is counted in mass ratio in following comparative example and embodiment：Fixed carbon is 80.45wt%,
Ash content is 4.48wt%, and volatilization is divided into 15.07wt%.In charcoal 95% and the particle diameter of the above be less than 0.074mm.Magnetite powder
In 93% and the particle diameter of the above be less than 0.074mm.
Comparative example 1
Magnetite powder, charcoal, bentonite and water are moistened into mill 5min, profit mill rotating speed is 600r/min, forms mixed material
A；Control in mixed material A, the mass ratio of the carbon of charcoal and the oxygen element of magnetite powder is 0.8:1；It is bentonitic to add
Enter the 3wt% that amount is quality of magnetite powder, the addition of water is the 6wt% of mixed material A quality.
Magnetite powder, bentonite and water are moistened into mill 5min, profit mill rotating speed is 600r/min, forms mixed material B；Mixture
Expect in B, bentonitic addition is the 3wt% of quality of magnetite powder, and the addition of water is the 6wt% of mixed material B quality.
Mixed material A is first added on pelletizer internal layer spheroid is made, it is 3min to control internal layer nucleation time, and internal layer is grown up
Time is 4min, controls a diameter of 8mm of internal layer ball, then adds mixed material B, and it is 2min to control outer layer time of growing up, ball
Group's close temporal is 3min, forms the outer layer of cladding internal layer spheroid, that is, obtains the pelletizing with bilayer sphere structure, pelletizing is final
A diameter of 10mm, the mass ratio of the oxygen element of the carbon of charcoal and magnetite powder is 0.53 in pelletizing:1.
The green-ball of iron ore pellets containing the charcoal test that this comparative example 1 obtains：Compression strength is 5.6N/, and drop strength is
1.9 times/(0.5m), burst temperature is 480 DEG C.
Comparative example 2
Magnetite powder, charcoal, bentonite and water are moistened into mill 5min, profit mill rotating speed is 500r/min, forms mixed material
A；Control in mixed material A, the mass ratio of the carbon of charcoal and the oxygen element of magnetite powder is 1.35:1；It is bentonitic to add
Enter the 3wt% that amount is quality of magnetite powder, the addition of water is the 6wt% of mixed material A quality.
Magnetite powder, bentonite and water are moistened into mill 5min, profit mill rotating speed is 500r/min, forms mixed material B；Mixture
Expect in B, bentonitic addition is the 3wt% of quality of magnetite powder, and the addition of water is the 6wt% of mixed material B quality.
Mixed material A is first added on pelletizer internal layer spheroid is made, it is 3min to control internal layer nucleation time, and internal layer is grown up
Time is 4min, controls a diameter of 8mm of internal layer ball, then adds mixed material B, and it is 2min to control outer layer time of growing up, ball
Group's close temporal is 3min, forms the outer layer of cladding internal layer spheroid, that is, obtains the pelletizing with bilayer sphere structure, pelletizing is final
A diameter of 12mm, the mass ratio of the oxygen element of the carbon of charcoal and magnetite powder is 0.9 in pelletizing:1.
The green-ball of iron ore pellets containing the charcoal test that this comparative example 2 obtains：Compression strength is 3.4N/, and drop strength is
1.1 secondary/0.5m, burst temperature is 480 DEG C.
Comparative example 3
Magnetite powder, charcoal, bentonite and water are well mixed, form mixed material A；Control in mixed material A, it is raw
The mass ratio of the carbon of thing charcoal and the oxygen element of magnetite powder is 1.05:1；Bentonitic addition is quality of magnetite powder
3wt%, the addition of water are the 6wt% of mixed material A quality.
Magnetite powder, bentonite and water are well mixed, form mixed material B；In mixed material B, bentonitic addition
The 3wt% for quality of magnetite powder is measured, the addition of water is the 6wt% of mixed material B quality.
Mixed material A is first added on pelletizer internal layer spheroid is made, it is 3min to control internal layer nucleation time, and internal layer is grown up
Time is 4min, controls a diameter of 6mm of internal layer ball, then adds mixed material B, and it is 2min to control outer layer time of growing up, ball
Group's close temporal is 3min, forms the outer layer of cladding internal layer spheroid, that is, obtains the pelletizing with bilayer sphere structure, pelletizing is final
A diameter of 7mm, the mass ratio of the oxygen element of the carbon of charcoal and magnetite powder is 0.7 in pelletizing:1.
The green-ball of iron ore pellets containing charcoal that this comparative example 3 obtains：Compression strength is 5.3N/, drop strength 3.6
Secondary/(0.5m), burst temperature are 480 DEG C.
Comparative example 4
Magnetite powder, charcoal, bentonite and water are well mixed, form mixed material A；Control in mixed material A, it is raw
The mass ratio of the carbon of thing charcoal and the oxygen element of magnetite powder is 1.05:1；Bentonitic addition is quality of magnetite powder
3wt%, the addition of water are the 6wt% of mixed material A quality.
Magnetite powder, bentonite and water are well mixed, form mixed material B；In mixed material B, bentonitic addition
The 3wt% for quality of magnetite powder is measured, the addition of water is the 6wt% of mixed material B quality.
Mixed material A is first added on pelletizer internal layer spheroid is made, it is 4min to control internal layer nucleation time, and internal layer is grown up
Time is 5min, controls a diameter of 8mm of internal layer ball, then adds mixed material B, and it is 3min to control outer layer time of growing up, ball
Group's close temporal is 2min, forms the outer layer of cladding internal layer spheroid, that is, obtains the pelletizing with bilayer sphere structure, pelletizing is final
A diameter of 10mm, the mass ratio of the oxygen element of the carbon of charcoal and magnetite powder is 0.7 in pelletizing:1.
The green-ball of iron ore pellets containing the charcoal test that this comparative example 4 obtains：Compression strength is 8.5N/, and drop strength is
2.3 times/(0.5m), burst temperature is 300 DEG C.
Comparative example 5
Magnetite powder, charcoal, bentonite and water are well mixed, form mixed material；Control in mixed material, biology
The mass ratio of the carbon of charcoal and the oxygen element of magnetite powder is 0.7:1；Bentonitic addition is quality of magnetite powder
3wt%, the addition of water are the 6wt% of mixed material A quality.
Mixed material is added on pelletizer internal layer spheroid is made, it is 4min to control internal layer nucleation time, when internal layer is grown up
Between be 5min, control a diameter of 9mm of internal layer ball, then add mixed material, it is 3min to control outer layer time of growing up, and pelletizing is tight
The close time is 2min, and it is 11mm to control pelletizing final diameter.
The green-ball of iron ore pellets containing the charcoal test that this comparative example 5 obtains：Compression strength is 5.8N/, and drop strength is
2.6 times/(0.5m), burst temperature is 350 DEG C.
Embodiment 1
Magnetite powder, charcoal, bentonite and water are well mixed, form mixed material A；Control in mixed material A, it is raw
The mass ratio of the carbon of thing charcoal and the oxygen element of magnetite powder is 1.05:1；Bentonitic addition is quality of magnetite powder
3wt%, the addition of water are the 6wt% of mixed material A quality.
Magnetite powder, bentonite and water are well mixed, form mixed material B；In mixed material B, bentonitic addition
The 3wt% for quality of magnetite powder is measured, the addition of water is the 6wt% of mixed material B quality.
Mixed material A is first added on pelletizer internal layer spheroid is made, it is 3min to control internal layer nucleation time, and internal layer is grown up
Time is 4min, controls a diameter of 9mm of internal layer ball, then adds mixed material B, and it is 2min to control outer layer time of growing up, ball
Group's close temporal is 3min, forms the outer layer of cladding internal layer spheroid, that is, obtains the pelletizing with bilayer sphere structure, pelletizing is final
A diameter of 11mm, the mass ratio of the oxygen element of the carbon of charcoal and magnetite powder is 0.7 in pelletizing:1.
The green-ball of iron ore pellets containing the charcoal test that the present embodiment 1 obtains：Compression strength is 10.2N/, and drop strength is
9.6 times/(0.5m), burst temperature is 400 DEG C.
Embodiment 2
Magnetite powder, charcoal, bentonite and water are moistened into mill 5min, profit mill rotating speed 600r/min, form mixed material A；
Control in mixed material A, the mass ratio of the carbon of charcoal and the oxygen element of magnetite powder is 1.3:1；Bentonitic addition
The 2.5wt% for quality of magnetite powder is measured, the addition of water is the 7wt% of mixed material A mass.
Magnetite powder, bentonite and water are moistened into mill 5min, profit mill rotating speed 600r/min, form mixed material B；Mixed material
In B, bentonitic addition is the 2.5wt% of quality of magnetite powder, and the addition of water is the 7wt% of mixed material B quality.
Mixed material A is first added on pelletizer internal layer spheroid is made, it is 2min to control internal layer nucleation time, and internal layer is grown up
Time is 3min, controls a diameter of 9mm of internal layer ball, then adds mixed material B, and it is 2min to control outer layer time of growing up, ball
Group's close temporal is 3min, forms the outer layer of cladding internal layer spheroid, that is, obtains the pelletizing with bilayer sphere structure, pelletizing is final
A diameter of 12mm, the mass ratio of the oxygen element of the carbon of charcoal and magnetite powder is 0.85 in pelletizing:1.
The green-ball of iron ore pellets containing the charcoal test that the present embodiment 2 obtains：Compression strength is 9.3N/, and drop strength is
5.5 times/(0.5m), burst temperature is 420 DEG C.
Embodiment 3
Magnetite powder, charcoal, bentonite and water are well mixed, form mixed material A；Control in mixed material A, it is raw
The mass ratio of the carbon of thing charcoal and the oxygen element of magnetite powder is 0.95:1；Bentonitic addition is quality of magnetite powder
3.5wt%, the addition of water are the 6wt% of mixed material A quality.
Magnetite powder, bentonite and water are well mixed, form mixed material B；In mixed material B, bentonitic addition
The 3.5wt% for quality of magnetite powder is measured, the addition of water is the 6wt% of mixed material B quality.
Mixed material A is first added on pelletizer internal layer spheroid is made, it is 3min to control internal layer nucleation time, and internal layer is grown up
Time is 4min, controls a diameter of 8mm of internal layer ball, then adds mixed material B, and it is 2min to control outer layer time of growing up, ball
Group's close temporal is 3min, forms the outer layer of cladding internal layer spheroid, that is, obtains the pelletizing with bilayer sphere structure, pelletizing is final
A diameter of 11mm, the mass ratio of the oxygen element of the carbon of charcoal and magnetite powder is 0.63 in pelletizing:1.
The green-ball of iron ore pellets containing the charcoal test that the present embodiment 3 obtains：Compression strength is 11.4N/, and drop strength is
9.1 times/(0.5m), burst temperature is 400 DEG C.
Embodiment 4
Magnetite powder, charcoal, bentonite and water are moistened into mill 5min, profit mill rotating speed 550r/min, form mixed material A；
Control in mixed material A, the mass ratio of the carbon of charcoal and the oxygen element of magnetite powder is 1.1:1；Bentonitic addition
The 3wt% for quality of magnetite powder is measured, the addition of water is the 6wt% of mixed material A quality.
Magnetite powder, bentonite and water are moistened into mill 5min, profit mill rotating speed 550r/min, form mixed material B；Mixed material
In B, bentonitic addition is the 3wt% of quality of magnetite powder, and the addition of water is the 6wt% of mixed material B quality.
Mixed material A is first added on pelletizer internal layer spheroid is made, it is 2.5min to control internal layer nucleation time, and internal layer is grown
The big time be 3.5min, controls a diameter of 10mm of internal layer ball, then addition mixed material B, controls outer layer time of growing up to be
1.5min, pelletizing close temporal are 2.5min, form the outer layer of cladding internal layer spheroid, that is, obtain the ball with bilayer sphere structure
Group, pelletizing final diameter be 12mm, and the mass ratio of the oxygen element of the carbon of charcoal and magnetite powder is 0.73 in pelletizing:1.
The green-ball of iron ore pellets containing charcoal that the present embodiment 4 obtains：Compression strength is 8.6N/, drop strength 6.3
Secondary/(0.5m), burst temperature are 410 DEG C.
Embodiment 5
Magnetite powder, charcoal, bentonite and water are well mixed, form mixed material A；Control in mixed material A, it is raw
The mass ratio of the carbon of thing charcoal and the oxygen element of magnetite powder is 1.05:1；Bentonitic addition is quality of magnetite powder
3.5wt%, the addition of water are the 6.5wt% of mixed material A quality.
Magnetite powder, bentonite and water are well mixed, form mixed material B；In mixed material B, bentonitic addition
The 3.5wt% for quality of magnetite powder is measured, the addition of water is the 6.5wt% of mixed material B quality.
Mixed material A is first added on pelletizer internal layer spheroid is made, it is 3min to control internal layer nucleation time, and internal layer is grown up
Time is 4min, controls a diameter of 8mm of internal layer ball, then adds mixed material B, and it is 1min to control outer layer time of growing up, ball
Group's close temporal is 2min, forms the outer layer of cladding internal layer spheroid, that is, obtains the pelletizing with bilayer sphere structure, pelletizing is final
A diameter of 12mm, the mass ratio of the oxygen element of the carbon of charcoal and magnetite powder is 0.65 in pelletizing:1.
The green-ball of iron ore pellets containing the charcoal test that the present embodiment 5 obtains：Compression strength is 9.1N/, and drop strength is
6.5 times/(0.5m), burst temperature is 400 DEG C.
Embodiment 6
Magnetite powder, charcoal, bentonite and water are well mixed, form mixed material A；Control in mixed material A, it is raw
The mass ratio of the carbon of thing charcoal and the oxygen element of magnetite powder is 1.05:1；Bentonitic addition is quality of magnetite powder
2.5wt%, the addition of water are the 7wt% of mixed material A quality.
Magnetite powder, bentonite and water are well mixed, form mixed material B；In mixed material B, bentonitic addition
The 2.5wt% for quality of magnetite powder is measured, the addition of water is the 7wt% of mixed material B quality.
Mixed material A is first added on pelletizer internal layer spheroid is made, it is 3min to control internal layer nucleation time, and internal layer is grown up
Time is 4min, controls a diameter of 8mm of internal layer ball, then adds mixed material B, and it is 2min to control outer layer time of growing up, ball
Group's close temporal is 3min, forms the outer layer of cladding internal layer spheroid, that is, obtains the pelletizing with bilayer sphere structure, pelletizing is final
A diameter of 11mm, the mass ratio of the oxygen element of the carbon of charcoal and magnetite powder is 0.7 in pelletizing:1.
The green-ball of iron ore pellets containing the charcoal test that the present embodiment 6 obtains：Compression strength is 9.7N/, and drop strength is
8.7 times/(0.5m), burst temperature is 430 DEG C.
It is obvious to a person skilled in the art that the invention is not restricted to the details of above-mentioned one exemplary embodiment, Er Qie
In the case of without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms, therefore, no matter
From the point of view of which point, embodiment all should be regarded as exemplary, and be nonrestrictive, the scope of the present invention is by appended power
Profit requires rather than described above limits, it is intended that all in the implication and scope of the equivalency of claim by falling
Change is included in the present invention.
Moreover, it will be appreciated that although the present specification is described in terms of embodiments, not each embodiment is only wrapped
Containing an independent technical scheme, this narrating mode of specification is only that those skilled in the art should for clarity
Using specification as an entirety, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art
It is appreciated that other embodiments.
Claims (10)
- A kind of 1. iron ore pellets containing charcoal, it is characterised in that：The pelletizing has internal layer spheroid and coats the internal layer spheroid Outer layer, a diameter of D of internal layer spheroid1, D1For 8~10mm, a diameter of D of pelletizing2, D2-D1For 1~4mm and D2≤12mm；The internal layer spheroid is made up of Iron Ore Powder, charcoal, binding agent, water；In the internal layer spheroid carbon of charcoal with The mass ratio of the oxygen element of Iron Ore Powder is (0.95~1.3):1；The outer layer is made up of Iron Ore Powder, binding agent, water；The mass ratio of the carbon of charcoal and the oxygen element of Iron Ore Powder is (0.63~0.85) in the pelletizing:1.
- 2. one kind iron ore pellets containing charcoal according to claim 1, it is characterised in that：The D1For 9~10mm, D2-D1 For 1~3mm and it is D2≤12mm；The mass ratio of the carbon of charcoal and the oxygen element of Iron Ore Powder is in the internal layer spheroid (0.95~1.05):1；The mass ratio of the carbon of charcoal and the oxygen element of Iron Ore Powder is (0.63~0.7) in the pelletizing: 1。
- 3. one kind iron ore pellets containing charcoal according to claim 1, it is characterised in that：Bonding in the internal layer spheroid Agent is bentonite, and bentonitic content is 2.5~3.5wt% of Iron Ore Powder quality in internal layer spheroid；Bonding in the outer layer Agent is bentonite, and bentonitic content is 2.5~3.5wt% of Iron Ore Powder quality in outer layer spheroid；The internal layer spheroid reclaimed water Content be internal layer spheroid mass 6~7wt%, the content of the outer layer reclaimed water is 6~7wt% of outer layer quality, it is described in Iron Ore Powder in layer spheroid is magnetite powder, and the Iron Ore Powder in the outer layer is magnetite powder.
- 4. one kind iron ore pellets containing charcoal according to claim 1, it is characterised in that：The iron ore pellets containing charcoal Green-ball is tested：Compression strength is 8.6~11.4N/, drop strength is 5.5~9.6 times/(0.5m), burst temperature is 400~430 DEG C.
- 5. a kind of preparation method for preparing the iron ore pellets containing charcoal as described in Claims 1 to 4 any one, its feature exist In：Comprise the following steps：Iron Ore Powder, charcoal, binding agent and water are well mixed, form mixed material A；Iron Ore Powder, binding agent and water are mixed Uniformly, mixed material B is formed；Mixed material A is first added on pelletizer internal layer spheroid is made, then add mixed material B, shape Into the outer layer of cladding internal layer spheroid, the pelletizing of the structure containing bilayer sphere is obtained；In the mixed material A, the mass ratio of the oxygen element in carbon and Iron Ore Powder in charcoal is (0.95~1.3): 1；In the pelletizing, the mass ratio of the oxygen element in carbon and Iron Ore Powder in charcoal is (0.63~0.85):1The internal layer spheroid is D1, D1For 8~10mm, a diameter of D of pelletizing2, D2-D1For 1~4mm and D2≤12mm。
- A kind of 6. preparation method of iron ore pellets containing charcoal according to claim 5, it is characterised in that：The Iron Ore Powder is magnetite powder, in the magnetite powder 93% and the particle diameter of the above be less than 0.074mm, the charcoal In 95% and the particle diameter of the above be less than 0.074mm.
- A kind of 7. preparation method of iron ore pellets containing charcoal according to claim 5, it is characterised in that：Described binding agent is bentonite, in the mixed material A, bentonitic content for Iron Ore Powder quality 2.5~ In 3.5wt%, the mixed material B, bentonitic content is 2.5~3.5wt% of Iron Ore Powder quality；The mixed material A The content of reclaimed water is 6~7wt% of mixed material A mass, and the content of the mixed material B reclaimed waters is the 6 of mixed material B mass ~7wt%.
- A kind of 8. preparation method of iron ore pellets containing charcoal according to claim 5, it is characterised in that：The mixture Expect in A, the mass ratio of the oxygen element in carbon and Iron Ore Powder in charcoal is (0.95~1.05):1；In the pelletizing, The mass ratio of the oxygen element in carbon and Iron Ore Powder in charcoal is (0.63~0.7):1；The D1For 9~10mm, D2- D1For 1~3mm and it is D2≤12mm。
- A kind of 9. preparation method of iron ore pellets containing charcoal according to claim 5, it is characterised in that：On pelletizer It is 2~3min to add mixed material A and the nucleation time of internal layer spheroid is made, and the time that internal layer spheroid is grown up is 3~4min, outer layer Time of growing up is 1~2min, and pelletizing close temporal is 2~3min.
- A kind of 10. preparation method of iron ore pellets containing charcoal according to claim 9, it is characterised in that：Internal layer spheroid Nucleation time be 3min, the time that internal layer spheroid is grown up is 4min, and outer layer time of growing up is 2min, and pelletizing close temporal is 3min。
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| CN108675297A (en) * | 2018-06-26 | 2018-10-19 | 苏州大学 | A method of preparing cementite using biomass charcoal |
| CN109055729A (en) * | 2018-09-21 | 2018-12-21 | 中国科学院城市环境研究所 | A kind of method of sludge organism charcoal resource utilization |
| CN110438335A (en) * | 2018-05-02 | 2019-11-12 | 中南大学 | It is a kind of for the compound iron ore pellet containing charcoal of microwave reduction and its preparation and application |
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| CN102586529A (en) * | 2012-03-23 | 2012-07-18 | 北京科技大学 | Rotary hearth furnace iron-making method utilizing biomass carbon-containing pellet to serve as raw material |
| CN102899484A (en) * | 2012-10-23 | 2013-01-30 | 鞍钢股份有限公司 | Iron coke composite pellets with high reactivity and high strength as well as manufacturing method thereof |
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| CN101597662A (en) * | 2009-07-02 | 2009-12-09 | 贾会平 | A kind of method of producing direct-reduced iron |
| CN102586529A (en) * | 2012-03-23 | 2012-07-18 | 北京科技大学 | Rotary hearth furnace iron-making method utilizing biomass carbon-containing pellet to serve as raw material |
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| CN110438335A (en) * | 2018-05-02 | 2019-11-12 | 中南大学 | It is a kind of for the compound iron ore pellet containing charcoal of microwave reduction and its preparation and application |
| CN108675297A (en) * | 2018-06-26 | 2018-10-19 | 苏州大学 | A method of preparing cementite using biomass charcoal |
| CN109055729A (en) * | 2018-09-21 | 2018-12-21 | 中国科学院城市环境研究所 | A kind of method of sludge organism charcoal resource utilization |
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