CN103074485B - Preparation method of oxidized pellets with coarse-grain hematite as main raw material - Google Patents
Preparation method of oxidized pellets with coarse-grain hematite as main raw material Download PDFInfo
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- CN103074485B CN103074485B CN201310045787.9A CN201310045787A CN103074485B CN 103074485 B CN103074485 B CN 103074485B CN 201310045787 A CN201310045787 A CN 201310045787A CN 103074485 B CN103074485 B CN 103074485B
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Abstract
The invention relates to a preparation method of oxidized pellets with coarse-grain hematite as a main raw material. The technical scheme of the invention is as follows: uniformly mixing 60-70 percent by weight of coarse-grain hematite, 20-30 percent by weight of fine-grain iron-containing raw material, 2-6 percent by weight of organic binding agent and 5-8 percent by weight of water, and carrying out pressure forming to obtain ellipsoidal green-balls; and roasting the ellipsoidal green-balls at 1150-1200 DEG C for 15-30min to obtain the oxidized pellets, wherein the coarse-grain hematite is ground hematite or pelletized return fines and has the grain diameter of being less than or equal to 6mm; the fine-grain iron-containing raw material is electric precipitation dust in the smelting process of iron ore concentrate or steel; the organic binding agent is prepared by mixing starch, inorganic sodium salt, borate and water according to a mass ratio of 1: (0.04-0.15): (0.02-0.10): (4.0-5.0); and forming equipment is a double-roll ball press machine, wherein the forming pressure is 10-30MPa. The preparation method disclosed by the invention has the advantages of strong adaptability to raw material granularity, simple process, low energy consumption, low production cost and high quality of oxidized pellets.
Description
Technical field
The invention belongs to acid pellet technical field, particularly relate to a kind of acid pellet preparation method being main raw material with coarse grain rhombohedral iron ore.
Background technology
Acid pellet occupies very important status as a kind of feed stock for blast furnace of high-quality in steel industry, and along with the development of steel industry, the demand of acid pellet is in continuous increase.Current China is mainly raw material production acid pellet with magnetite, but along with constantly exploitation and use, the output of magnetite is difficult to the demand meeting acid pellet production gradually.And equally as the rhombohedral iron ore reserves at home and in the world of iron-smelting raw material and output all very large, therefore utilize rhombohedral iron ore to prepare acid pellet by significant for main raw material.
At present, utilize rhombohedral iron ore to prepare the method for acid pellet mainly by pelletizing roasting after rhombohedral iron ore pulverizing and jevigating, this method be by after levigate for coarse grain rhombohedral iron ore again pelletizing make the pelletizing compared with volume particle size, grinding processes is indispensable operation.For the easy mill rhombohedral iron ore that hardness is less, ore grinding ratio is easier to; But for the difficulty mill rhombohedral iron ore that hardness is larger, not only ore grinding cost is high, and the wearing and tearing of grinding attachment are very serious, and this will cause production cost to raise and equipment operation rate reduces.In addition the maturing temperature needed for this For Fine Hematite Ore pelletizing roasting method is higher, and cause energy consumption in production comparatively large, production cost is higher.As " a kind of production method of high rhombohedral iron ore proportioning pelletizing " (CN102560094A) patented technology, the maturing temperature in this technology improves gradually along with the increase of rhombohedral iron ore proportioning.
Summary of the invention
The present invention is intended to overcome the deficiencies in the prior art, and object is to provide a kind of to raw material granularity strong adaptability, technique is simple, energy consumption is little, production cost is low and quality the is high acid pellet preparation method being main raw material with coarse grain rhombohedral iron ore.
For achieving the above object, the technical solution used in the present invention is: first the particulate iron-bearing material of the coarse grain rhombohedral iron ore of 60 ~ 70wt%, 20 ~ 30wt%, the organic binder bond of 2 ~ 6wt% and the water of 5 ~ 8wt% are mixed, extrusion forming, make elliposoidal green-ball; Then by the roasting under 1150 ~ 1200 DEG C of conditions of elliposoidal green-ball, roasting time is 15 ~ 30min, obtains acid pellet.
Described coarse grain rhombohedral iron ore is ground hematite or is pellet screening, coarse grain rhombohedral iron ore particle diameter≤6mm.
Described particulate iron-bearing material is iron ore concentrate or is the electro-precipitating dust in steel smelting procedure; In particulate iron-bearing material: granularity is less than 0.074mm and accounts for 70 ~ 98wt%, granularity is that 0.074 ~ 0.15mm accounts for 2 ~ 30wt%.
Described organic binder bond is that ((0.02 ~ 0.10) ︰ (4.0 ~ 5.0) mixing is obtained for 0.04 ~ 0.15) ︰ for 1 ︰ in mass ratio by starch, inorganic sodium, borate and water.
The equipment of described extrusion forming is pair roller ball press, and forming pressure is 10 ~ 30MPa.
Owing to adopting aforesaid method, the present invention has following positively effect:
1, the present invention is with the coarse grain rhombohedral iron ore of particle diameter≤6mm for main raw material, adds binding agent with addition of appropriate particulate iron-bearing material, eliminates grinding process, and technique is simple, to raw material granularity strong adaptability.
2, the binding agent that the present invention adopts is organic adhesive agent solution, and not only bond effect is good, and organic binder bond can decompose volatilization in high-temperature calcination process simultaneously, avoids and causes because of adding of binding agent the Iron grade of acid pellet to reduce.
3, the present invention is with pair roller ball press for molding device, and not only production technique is simple and convenient, and obtained elliposoidal green ball strength is high, is easy to roasting.
4, the present invention's obtained acid pellet meeting blast-furnace smelting and require under lower maturing temperature and shorter roasting time, energy consumption is little, production cost is low.
5, the present invention take rhombohedral iron ore as main raw material, and with addition of part dedusting ash or iron ore concentrate, in the acid pellet after the roasting of overvoltage group, ferrous content is very low.
Therefore, the present invention has strong to adaptability to raw material, that technique is simple, energy consumption is little, production cost is low and acid pellet quality is high advantage.
Embodiment
Below in conjunction with embodiment, the invention will be further described, the restriction not to its protection domain.
For avoiding repetition, first by as follows to the coarse grain rhombohedral iron ore involved by this embodiment, particulate iron-bearing material and extrusion forming mode Unify legislation, repeat no more in embodiment:
The particle diameter of ground hematite and pellet screening respectively≤6mm;
In electro-precipitating dust in iron ore concentrate and steel smelting procedure: granularity is less than 0.074mm and accounts for 70 ~ 98wt%, and granularity is that 0.074 ~ 0.15mm accounts for 2 ~ 30wt%;
The equipment of extrusion forming is pair roller ball press.
Embodiment 1
A kind of acid pellet preparation method that is main raw material with coarse grain rhombohedral iron ore.First the organic binder bond of the electro-precipitating dust in the steel smelting procedure of the ground hematite of 60 ~ 64wt%, 26 ~ 30wt%, 2 ~ 4wt% and the water of 7 ~ 8wt% are mixed, extrusion forming, make elliposoidal green-ball; Then by the roasting under 1150 ~ 1170 DEG C of conditions of elliposoidal green-ball, roasting time is 22 ~ 30min, obtains acid pellet.
In the present embodiment: described organic binder bond is that ((0.02 ~ 0.05) ︰ (4.0 ~ 4.5) mixing is obtained for 0.04 ~ 0.09) ︰ for 1 ︰ in mass ratio by starch, inorganic sodium, borate and water; Forming pressure is 10 ~ 20MPa.
Embodiment 2
A kind of acid pellet preparation method that is main raw material with coarse grain rhombohedral iron ore.First the water of the iron ore concentrate of the ground hematite of 62 ~ 66wt%, 25 ~ 29wt%, the organic binder bond of 2 ~ 4wt% and 7 ~ 8wt% is mixed, extrusion forming, make elliposoidal green-ball; Then by the roasting under 1150 ~ 1170 DEG C of conditions of elliposoidal green-ball, roasting time is 22 ~ 30min, obtains acid pellet.
In the present embodiment: described organic binder bond is that ((0.03 ~ 0.06) ︰ (4.1 ~ 4.6) mixing is obtained for 0.05 ~ 0.10) ︰ for 1 ︰ in mass ratio by starch, inorganic sodium, borate and water; Forming pressure is 12 ~ 22MPa.
Embodiment 3
A kind of acid pellet preparation method that is main raw material with coarse grain rhombohedral iron ore.First the organic binder bond of the electro-precipitating dust in the steel smelting procedure of the pellet screening of 63 ~ 67wt%, 24 ~ 28wt%, 3 ~ 5wt% and the water of 6 ~ 7wt% are mixed, extrusion forming, make elliposoidal green-ball; Then by the roasting under 1160 ~ 1180 DEG C of conditions of elliposoidal green-ball, roasting time is 18 ~ 27min, obtains acid pellet.
In the present embodiment: described organic binder bond is that ((0.04 ~ 0.07) ︰ (4.2 ~ 4.7) mixing is obtained for 0.06 ~ 0.11) ︰ for 1 ︰ in mass ratio by starch, inorganic sodium, borate and water; Forming pressure is 14 ~ 24MPa.
Embodiment 4
A kind of acid pellet preparation method that is main raw material with coarse grain rhombohedral iron ore.First the water of the iron ore concentrate of the pellet screening of 64 ~ 68wt%, 23 ~ 27wt%, the organic binder bond of 3 ~ 5wt% and 6 ~ 7wt% is mixed, extrusion forming, make elliposoidal green-ball; Then by the roasting under 1160 ~ 1180 DEG C of conditions of elliposoidal green-ball, roasting time is 18 ~ 27min, obtains acid pellet.
In the present embodiment: described organic binder bond is that ((0.05 ~ 0.08) ︰ (4.3 ~ 4.8) mixing is obtained for 0.07 ~ 0.12) ︰ for 1 ︰ in mass ratio by starch, inorganic sodium, borate and water; Forming pressure is 16 ~ 23MPa.
Embodiment 5
A kind of acid pellet preparation method that is main raw material with coarse grain rhombohedral iron ore.First the water of the iron ore concentrate of the ground hematite of 65 ~ 69wt%, 22 ~ 26wt%, the organic binder bond of 4 ~ 6wt% and 5 ~ 6wt% is mixed, extrusion forming, make elliposoidal green-ball; Then by the roasting under 1175 ~ 1200 DEG C of conditions of elliposoidal green-ball, roasting time is 15 ~ 23min, obtains acid pellet.
In the present embodiment: described organic binder bond is that ((0.06 ~ 0.09) ︰ (4.4 ~ 4.9) mixing is obtained for 0.08 ~ 0.13) ︰ for 1 ︰ in mass ratio by starch, inorganic sodium, borate and water; Forming pressure is 18 ~ 28MPa.
Embodiment 6
A kind of acid pellet preparation method that is main raw material with coarse grain rhombohedral iron ore.First the organic binder bond of the electro-precipitating dust in the steel smelting procedure of the pellet screening of 66 ~ 70wt%, 20 ~ 24wt%, 4 ~ 6wt% and the water of 5 ~ 6wt% are mixed, extrusion forming, make elliposoidal green-ball; Then by the roasting under 1175 ~ 1200 DEG C of conditions of elliposoidal green-ball, roasting time is 15 ~ 23min, obtains acid pellet.
In the present embodiment: described organic binder bond is that ((0.07 ~ 0.10) ︰ (4.5 ~ 5.0) mixing is obtained for 0.09 ~ 0.15) ︰ for 1 ︰ in mass ratio by starch, inorganic sodium, borate and water; Forming pressure is 20 ~ 30MPa.
This embodiment has following positively effect:
1, this embodiment is with the coarse grain rhombohedral iron ore of particle diameter≤6mm for main raw material, adds binding agent with addition of appropriate particulate iron-bearing material, eliminates grinding process, and technique is simple, to raw material granularity strong adaptability.
2, the binding agent that this embodiment adopts is organic adhesive agent solution, and not only bond effect is good, and organic binder bond can decompose volatilization in high-temperature calcination process simultaneously, avoids and causes because of adding of binding agent the Iron grade of acid pellet to reduce.
3, this embodiment is with pair roller ball press for molding device, and not only production technique is simple and convenient, and obtained elliposoidal green ball strength is high, is easy to roasting.
4, this embodiment obtained acid pellet meeting blast-furnace smelting and require under lower maturing temperature and shorter roasting time, energy consumption is little, production cost is low.
5, this embodiment take rhombohedral iron ore as main raw material, and with addition of part dedusting ash or iron ore concentrate, in the acid pellet after the roasting of overvoltage group, ferrous content is very low.
Therefore, this embodiment has strong to adaptability to raw material, that technique is simple, energy consumption is little, production cost is low, acid pellet quality is high advantage.
Claims (3)
1. the acid pellet preparation method that is main raw material with coarse grain rhombohedral iron ore, it is characterized in that: first the particulate iron-bearing material of the coarse grain rhombohedral iron ore of 60 ~ 70wt%, 20 ~ 30wt%, the organic binder bond of 2 ~ 6wt% and the water of 5 ~ 8wt% are mixed, extrusion forming, makes elliposoidal green-ball; Then by the roasting under 1150 ~ 1200 DEG C of conditions of elliposoidal green-ball, roasting time is 15 ~ 30min, obtains acid pellet;
Described coarse grain rhombohedral iron ore is ground hematite or is pellet screening, coarse grain rhombohedral iron ore particle diameter≤6mm;
Described particulate iron-bearing material is iron ore concentrate or is the electro-precipitating dust in steel smelting procedure; In particulate iron-bearing material: granularity is less than 0.074mm and accounts for 70 ~ 98wt%, granularity is that 0.074 ~ 0.15mm accounts for 2 ~ 30wt%.
2. the acid pellet preparation method that is main raw material with coarse grain rhombohedral iron ore according to claim 1, it is characterized in that described organic binder bond is is that ((0.02 ~ 0.10) ︰ (4.0 ~ 5.0) mixing is obtained for 0.04 ~ 0.15) ︰ for 1 ︰ in mass ratio by starch, inorganic sodium, borate and water.
3. the acid pellet preparation method that is main raw material with coarse grain rhombohedral iron ore according to claim 1, it is characterized in that the equipment of described extrusion forming is pair roller ball press, forming pressure is 10 ~ 30Mpa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310045787.9A CN103074485B (en) | 2013-02-06 | 2013-02-06 | Preparation method of oxidized pellets with coarse-grain hematite as main raw material |
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| CN201310045787.9A CN103074485B (en) | 2013-02-06 | 2013-02-06 | Preparation method of oxidized pellets with coarse-grain hematite as main raw material |
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| CN103074485A CN103074485A (en) | 2013-05-01 |
| CN103074485B true CN103074485B (en) | 2015-03-04 |
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| CN103937965B (en) * | 2014-03-19 | 2016-04-06 | 唐山国丰钢铁有限公司 | A kind of fine ore is with addition of dedusting ash agglomerates miner skill |
| CN110252253B (en) * | 2019-06-25 | 2022-03-25 | 四川省有色冶金研究院有限公司 | Porous magnetic adsorption material and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CA1005220A (en) * | 1974-02-25 | 1977-02-15 | National Research Council Of Canada | Method for producing ball agglomerated particulate material |
| JPS63130720A (en) * | 1986-11-21 | 1988-06-02 | Kawasaki Steel Corp | Production of pellet for fine powder raw material |
| CN1019819B (en) * | 1990-11-27 | 1992-12-30 | 凌源钢铁公司 | Production of pellet with reveert as core |
| JPH05311255A (en) * | 1992-03-13 | 1993-11-22 | Nisshin Steel Co Ltd | Production of sintered ore |
| CN1025749C (en) * | 1992-03-25 | 1994-08-24 | 冶金工业部钢铁研究总院 | Method for preparing pellet sintered ore |
| CN1603430A (en) * | 2004-09-02 | 2005-04-06 | 山东省冶金设计院 | Method for producing hematite pellet |
| CN2861173Y (en) * | 2005-06-08 | 2007-01-24 | 张清学 | Slag decomposing agent of steel-making dust slime sphere |
| CN101805827B (en) * | 2009-02-12 | 2011-12-21 | 宝山钢铁股份有限公司 | Sludge oxidized pellet and its preparation method |
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