CN1621541A - Process for preparing pellet from high-grade ironstone by using direct dry method - Google Patents
Process for preparing pellet from high-grade ironstone by using direct dry method Download PDFInfo
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- CN1621541A CN1621541A CN 200410097200 CN200410097200A CN1621541A CN 1621541 A CN1621541 A CN 1621541A CN 200410097200 CN200410097200 CN 200410097200 CN 200410097200 A CN200410097200 A CN 200410097200A CN 1621541 A CN1621541 A CN 1621541A
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Abstract
The direct dry process of producing pellet with high grade iron ore of 25 mm below granularity includes the following steps: stoving the ore powder to water content of 1.0-2.5 wt%; ball milling in medium speed ball mill into superfine ore powder with ore powder smaller than 200 mesh over 75 wt%; making wet pellet with water content 6-8 % in a pelletizer after adding bentonite in 0.3-0.7 % and spraying water; and roasting at 1150-1300 deg.c hr in kiln for 0.5-3 to form the acid pellet for smelting in blast furnace. The said process is suitable for utilizing ore powder with high grade, low magnetism and low strength.
Description
Technical field
The present invention relates to the manufacture method of a kind of metallurgy industry blast-furnace smelting, particularly go into the method for stove grog agglomeration with the raw material-oxide pellet of pellet.
Background technology
Pellet is a blast furnace ironmaking raw material, have of high grade, advantages such as intensity good, easy reduction, epigranular, good permeability, by with acidic pellet ore and the reasonably combined blast furnace materials of high basicity sinter, can optimize the blast furnace burden structure, reduce the coke ratio energy consumption, improve utilization coefficient, make ironmaking produce increase output, reduce cost, improve environment.Because China's iron ore deposit lean ore is many, rich ore is few, and complex ore is many, and single ore deposit is few, all need be selected through fine grinding, so mostly the raw materials for sintering of China is fine iron breeze; The magnetic separation of general process, washing can obtain required fine iron breeze, can't realize then that for the raw ore (as FeO/TFe＞10%) of low magnetic magnetic separation prepares fine iron breeze.Along with the aggravation day by day of fine iron breeze shortage situation, people press for to enlarge and make the required raw material sources scope of oxide pellet, the use range of widening mineral products.Enlarging the usage quantity of external import breeze, in addition, for low intensive pelletizing of higher-grade or agglomeration, be to adopt organic binder bond mostly, but because of cold strength is low, easily efflorescence is unfavorable for smelting in iron-smelting furnace; Though and mineral binder bond has overcome the defective that organic binder bond high temperature loses cohesive force, has reduced the ferrous grade of pellet.
Summary of the invention
The objective of the invention is by using improved pellet raw material, the raw material that provides the pellet of quality etc. and fine iron breeze manufacturing to be equal to for blast-furnace smelting, overcome unsuitable ore dressing of the low magnetic of higher-grade and higher-grade low strength and should not go into the ore use difficult problem of stove, the reasonable disposition Mineral resources, reduce the mineral products tooling cost, reduce the contaminate environment factor of ore dressing discharging mine tailing and the waste of water resources simultaneously.
To achieve these goals, the present invention proposes following technical scheme:
A kind of method of process for preparing pellet from high-grade ironstone by using direct dry, the raw material for preparing this pellet is: ore grade TFe＞62%, granularity are less than raw ore, fine ore, the import rich ore powder of 25mm and return mine, and this method comprises the steps:
A. oven dry: will dry extremely through the breeze of fragmentation
AbsorptionMoisture content is 1.0-2.5wt%, and the gross weight of this weight percent refers to the gross weight of all raw materials;
B. ball milling: place race pulverizer to carry out ball milling the breeze of drying, making granularity is particle size diameter＜0.074mm less than 200 purpose breeze ratios more than or equal to 75wt%, obtains ultra-fine finished iron breeze;
C. granulate: ultra-fine finished iron breeze is delivered to granulation device, add the wilkinite of 0.3%-0.7%, adopt atomizing to add the surface that water evenly is sprayed at breeze, and the wet bulb adsorption moisture is controlled at about 6-18%, assurance wet bulb 0.5m dropping strength does not ftracture for 3 times and is advisable;
D. roasting: above-mentioned wet bulb is delivered in the stove,, gets final product the finished ball nodulizing that roasting becomes blast-furnace smelting to use at 1150-1300 ℃ of roasting 0.5-3 hour; ,
Wherein above-mentioned finished ball nodulizing is an acidic pellet ore.
At described baking step, oven dry extremely
AbsorptionMoisture content is 1.5-2.5wt%.
In described ball milling step, the particle diameter of the ultra-fine finished iron breeze that obtains during from the ball mill discharging is about 0.074mm.
At described race pulverizer rotating speed is 35-45 rev/min.
Described granulation device is disk or cylinder tablets press.
In the described granulation step, adsorption moisture is about 8wt%, and the gross weight of this weight percent refers to the gross weight of all raw materials.
Described finished ball nodulizing CaO/SiO2 is about 0.6.
Magnetic ratio FeO/TFe＜10% of described raw material.
All iron content TFE＞62% of described raw material
Description of drawings
Accompanying drawing is the process flow sheet of this present invention's a embodiment, and Reference numeral wherein is: 1. raw material, 2. vibratory screening apparatus, 3. jaw crusher, 4. blending bun, 5. roller dryer, 6. race pulverizer, 7. granulation device, 8. e Foerderanlage, 9. calciner, 10. finished pellet, 11. blast furnaces.
Embodiment
Be described in detail of the present invention below in conjunction with embodiment.
The present invention adopts original ore powder refinement technology and technology, realized that the ultra-fine fine ore of original ore powder dry grinding makes the technological process of production of ball grogization, be equal to the high quality raw material that the fine iron breeze quality is made pellet for blast-furnace smelting provides, widen mineral products developing use range.
The raw ore of grade TFe＞62%, fine ore, import rich ore powder and return mine, the general magnetic of this raw material is lower, and therefore its magnetic ratio FeO/TFe＜10% can't carry out magnetic separation; In addition, the present invention can also use the low intensive raw material of higher-grade, i.e. ultimate compression strength＜1.0kn/cm
2Lump ore prepare pellet.
The concrete steps of the embodiment of the invention are as follows: raw material (former iron ore or powder) 1 will be that the square hole moto-vibro screen 2 of 25mm * 25mm carries out elementary decomposition by the aperture, screen overflow is crushed to granularity through jaw crusher 3 again mix with screen underflow after less than 25mm.The fine ore (import rich ore powder and homemade fine ore can not sieve fragmentation) that above-mentioned roughing becomes is sloughed planar water by be delivered to dry in the roller dryer 5 for blending bun 4 with certain flow through conveying belt, size according to breeze absorption moisture content, adjust the bake out temperature parameter or carry the breeze flow parameter, its residual adsorption moisture≤2% ± 0.5% is advisable.
Then, breeze after the oven dry is evenly supplied with (rotating speed is 40 rev/mins) in the race pulverizer 6 through material feeder, abrasive wear resistance and grindability index coefficient according to breeze, adjust the ball forging ratio example in the grinding machine, make the discharging-material size diameter of its grinding machine reach about 0.074mm substantially, and make it reach 75% percent of pass by-200 order mesh screens, be ultra-fine finished iron breeze.
With the above-mentioned ultra-fine powdered iron ore of making; be delivered to granulation device 7 (disk or cylinder tablets press); add 0.5% ± 0.2% wilkinite; adopt atomizing type to add the surface that water evenly is sprayed at breeze; and the wet bulb adsorption moisture is controlled at about 8%, assurance wet bulb 0.5m dropping strength does not ftracture for 3 times and is advisable.As can be seen, the present invention is because the binding agent that adds is very limited, can reduce hardly for the grade of ore, can obtain the agglomerate suitable with the raw material grade, and the finished ball nodulizing is an acidic pellet ore.
It is in the stove that the above-mentioned wet bulb that is prepared into is delivered to calciner 9 through e Foerderanlage 8, and under the processing condition of conventional roasting oxidation pellet, i.e. 1200 ℃ of following roastings 2 hours obtain finished pellet 10, can send into blast furnace 11 and be used for smelting.
A specific embodiment of the present invention below only is provided, and those of ordinary skill in the art can also carry out multiple improvement, combination and variation according to thought of the present invention.
Compared with prior art, the present invention adopts the original ore powder refinement to make the technology and the technology of ball, can realize that rawore makes the ball grogization, can not reduce the grade of iron ore, and above-mentioned finished ball nodulizing is acidic pellet ore (CaO/SiO2＜=0.6, high quality raw material for blast-furnace smelting, widened the use range of mineral products, as long as raw ore, fine ore, the import rich ore powder of iron ore grade (TFe＞62%), through drying and dewatering, can put into directly just that dried preparation becomes to meet to make the required powdered iron ore with granularity of oxide pellet in the race pulverizer.Overcome unsuitable ore dressing of the low magnetic of higher-grade and higher-grade low strength and should not go into the ore use difficult problem (high magnetic also is applicable to present method) of stove, the reasonable disposition Mineral resources have been played, reduce the effect of mineral products tooling cost, the environmental factors of minimizing ore dressing discharging mine tailing and the phenomenon of waste water resource have also been played simultaneously, have tangible economic benefit and social benefit widely, for example: dry method of the present invention directly grinds into super finely ground slag than the magnetic separation of iron ore concentrate powder of the equal quality expense that reduces cost about 20% per ton; And can make full use of low magnetic, low intensive high grade ore and be processed as the grog pellet and go into stove and smelt, strengthen the rate of utilization of import breeze, play the effect that reduces coke ratio, save valuable Mineral resources.
Claims (8)
1. the method for a process for preparing pellet from high-grade ironstone by using direct dry, it is characterized in that: the raw material for preparing this pellet is: ore grade TFe＞62%, granularity are less than raw ore, fine ore, the import rich ore powder of 25mm and return mine, and this method comprises the steps:
A. oven dry: extremely with above-mentioned breeze oven dry
AbsorptionMoisture content is 1.0-2.5wt%, and the gross weight of this weight percent refers to the gross weight of all raw materials;
B. ball milling: place race pulverizer to carry out ball milling the breeze of drying, make granularity less than 200 purpose breeze ratios more than or equal to 75wt%, obtain ultra-fine finished iron breeze;
C. granulate: ultra-fine finished iron breeze is delivered to granulation device, add the wilkinite of 0.3%-0.7%, adopt atomizing to add the surface that water evenly is sprayed at breeze, and the wet bulb adsorption moisture is controlled at about 6-8%, assurance wet bulb 0.5m dropping strength does not ftracture for 3 times and is advisable;
D. roasting: above-mentioned wet bulb is delivered in the stove,, gets final product the finished ball nodulizing that roasting becomes blast-furnace smelting to use at 1150-1300 ℃ of roasting 0.5-3 hour;
Wherein above-mentioned finished ball nodulizing is an acidic pellet ore.
2. preparation method according to claim 1 is characterized in that: at described baking step, oven dry extremely
AbsorptionMoisture content is 1.5-2.5wt%.
3. preparation method according to claim 1 is characterized in that: in described ball milling step, the particle diameter of the ultra-fine finished iron breeze that obtains during from the ball mill discharging is about 0.074mm.
4. preparation method according to claim 1 is characterized in that: at described race pulverizer rotating speed is 35-45 rev/min.
5. preparation method according to claim 1 is characterized in that: described granulation device is disk or cylinder tablets press.
6. preparation method according to claim 1 is characterized in that: in the described granulation step, adsorption moisture is about 8wt%, and the gross weight of this weight percent refers to the gross weight of all raw materials.
7. preparation method according to claim 1 is characterized in that: described finished ball nodulizing CaO/SiO2＜0.6.
8. preparation method according to claim 1 is characterized in that: magnetic ratio FeO/TFe＜10% of described raw material.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200410097200 CN1621541A (en) | 2004-12-14 | 2004-12-14 | Process for preparing pellet from high-grade ironstone by using direct dry method |
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| CN 200410097200 CN1621541A (en) | 2004-12-14 | 2004-12-14 | Process for preparing pellet from high-grade ironstone by using direct dry method |
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| CN1621541A true CN1621541A (en) | 2005-06-01 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102378820A (en) * | 2009-03-31 | 2012-03-14 | 新日本制铁株式会社 | Method for adding binder, device for adding binder, kneading machine and kneading method |
| CN101932738B (en) * | 2008-03-27 | 2012-10-10 | 株式会社神户制钢所 | Method for producing iron ore pellet |
| CN103031430A (en) * | 2011-09-29 | 2013-04-10 | 鞍钢股份有限公司 | Method for making sintering bed charge by returning mine at high mixture ratio |
| CN103555935A (en) * | 2013-11-21 | 2014-02-05 | 中冶北方（大连）工程技术有限公司 | Pellet iron ore concentrate fine grinding pelletizing system and process |
| CN110462070A (en) * | 2017-03-31 | 2019-11-15 | 杰富意钢铁株式会社 | It is granulated the manufacturing method of raw materials for sintering and the manufacturing method of sinter |
-
2004
- 2004-12-14 CN CN 200410097200 patent/CN1621541A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101932738B (en) * | 2008-03-27 | 2012-10-10 | 株式会社神户制钢所 | Method for producing iron ore pellet |
| CN102378820A (en) * | 2009-03-31 | 2012-03-14 | 新日本制铁株式会社 | Method for adding binder, device for adding binder, kneading machine and kneading method |
| CN102378820B (en) * | 2009-03-31 | 2017-06-20 | 新日铁住金株式会社 | Adhesive adding method, device for adding binder, kneading machine and compounding process |
| CN103031430A (en) * | 2011-09-29 | 2013-04-10 | 鞍钢股份有限公司 | Method for making sintering bed charge by returning mine at high mixture ratio |
| CN103031430B (en) * | 2011-09-29 | 2015-03-11 | 鞍钢股份有限公司 | Method for making sintering bed charge by returning mine at high mixture ratio |
| CN103555935A (en) * | 2013-11-21 | 2014-02-05 | 中冶北方（大连）工程技术有限公司 | Pellet iron ore concentrate fine grinding pelletizing system and process |
| CN110462070A (en) * | 2017-03-31 | 2019-11-15 | 杰富意钢铁株式会社 | It is granulated the manufacturing method of raw materials for sintering and the manufacturing method of sinter |
| CN110462070B (en) * | 2017-03-31 | 2022-02-11 | 杰富意钢铁株式会社 | Method for producing granulated sintering material and method for producing sintered ore |
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