CN103789537A - Method for reducing pellet production energy consumption by using iron scale - Google Patents
Method for reducing pellet production energy consumption by using iron scale Download PDFInfo
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- CN103789537A CN103789537A CN201410046306.0A CN201410046306A CN103789537A CN 103789537 A CN103789537 A CN 103789537A CN 201410046306 A CN201410046306 A CN 201410046306A CN 103789537 A CN103789537 A CN 103789537A
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Abstract
The invention discloses a method for reducing pellet production energy consumption by using iron scale which is a novel method for reasonably utilizing recycled steel rolling oxidized iron (scale) in a steel plant. When the scale is used in hematite powder pellet production, the strength of a hematite powder pellet ore finished ball is improved, the ball production energy consumption is reduced, and the service life of equipment for ball production is prolonged. The method comprises processes of scale pretreatment, blending, mixing, pelleting, material distribution, roasting and cooling and is characterized in that as scale powder is added into the hematite powder, the scale powder is prepared through fine grinding and pretreatment, wherein the addition ratio is 5-15%. By adopting the method, the problems that the roasting temperature of the hematite powder ball is high and so that a rotary furnace ring and a grid section of a belt type machine are likely to be burnt are effectively solved, the roasting temperature of the ball is reduced to 1,200-1,250 DEG C, the strength of the finished ball can be still more than 2,050N/piece. The method can be widely applied to processes for hematite powder ball production.
Description
Technical field
The present invention relates to a kind of utilization reduces pellet formation energy consumption method with addition of iron scale, be specifically related to a kind of recovery iron scale that rationally utilizes, to improve the method for ground hematite pelletizing finished ball intensity, belong to the utilization of resources field of reclaiming.
Background technology
Iron scale is the general name that System on Rolling Steel is shelled fallen iron scale and steel dissolved slag mud forming in acid cleaning process, is valuable renewable resource, and its FeO content is more than 50%, and full iron grade is in 70% left and right.General this resource is for SINTERING PRODUCTION, and adapted ratio is generally in 5% left and right, and ratio is crossed conference affects permeability of sintering material bed.
The breeze that is generally used for pellet formation has two kinds, and one is magnetite powder, and another kind is ground hematite.When magnetite powder is used the roasting of grate kiln technique, its maturing temperature is generally 1200-1230 ℃ of left and right, and finished pellet intensity can reach a 2300N ∕ pelletizing.And when ground hematite pellet roasting, due to its intrinsic baking property, when general maturing temperature need to be more than 1280 ℃, finished ball intensity can reach a 2300N ∕ pelletizing, and the rotary kiln high-temperature roasting more than 1250 ℃ for a long time, easily cause regional area ring formation, what impact was produced normally carries out, and also can threaten to the life-span of belt type roasting machine.
At present, for the grate-kiln pelletizing manufacturing enterprise take ground hematite as main raw material, mainly take to reduce its maturing temperature at ground hematite with addition of segment magnet breeze, but need be higher with addition of the ratio of magnetite powder, generally need more than 30%, just there is obvious effect, therefore high with addition of ratio, need outsourcing, raw material sources are unstable, are unfavorable for the stable and quality control of pellet composition.
Summary of the invention
In order to overcome above-mentioned deficiency, the present invention aims to provide one can make full use of recovery resource, can reduce again ground hematite pellet-roasting temperature, improve the method for ground hematite pellet strength, can effectively solve the problem such as the easy ring formation of rotary kiln and belt machine grid section easy burn-out that maturing temperature height that ground hematite pelletizing exists in roasting process brings thus, can utilize efficiently ground hematite to prepare oxide pellet.
A kind of method of utilizing iron scale to reduce pellet formation energy consumption provided by the invention, comprise batching, mixing, pelletizing, cloth, roasting, process for cooling, it is characterized in that: in described proportioning process, in ground hematite with addition of iron scale powder, being made through fine grinding pre-treatment by iron scale, is 5%-15% with addition of ratio.
The described iron scale that utilizes reduces the method for pellet formation energy consumption, comprises the following steps:
(1) iron scale pre-treatment:
Iron scale is carried out to fine grinding processing, and the product content that granularity is less than 0.01mm reaches more than 65%.
(2) batching:
Fine grinding iron scale powder, ground hematite and wilkinite are prepared burden by following weight percent, and concrete proportioning is:
Fine grinding iron scale powder 5%-15%
Ground hematite 84.5% ~ 93%,
Wilkinite 0.5 ~ 2%,
Each composition weight sum is 100%;
(3) mixing, pelletizing:
Above-mentioned each component admixtion, after powerful mixer mixes, is transported to pelletizing in balling disc, obtains water ratio and be 8.8% ~ 9.5%(by weight percentage), the green-ball that median size is 10mm ~ 16mm;
(4) cloth, roasting:
Qualified green-ball is transported on drying grate and is carried out after cloth, drying and preheating, enter in rotary kiln and carry out roasting, rotary kiln baking temperature is 1200-1250 ℃;
(5) cooling:
From rotary kiln, pellet is out sent into central cooler and is cooled to 150 ℃ of left and right, obtains finished ball nodulizing.
Prepare ground hematite pellet according to the method, pelletizing energy consumption can reduce by 2～4kg mark coal/t, and finished ball intensity can reach 2050 N/ more than ball.
The present invention, through add the fine grinding iron scale powder of the granularity that meets the requirements in raw material, makes rotary kiln baking temperature be reduced to 1200-1250 ℃, and the intensity of finished ball still can reach 2050N/ more than ball.Its principle is: FeO+1/4O
2=1/2Fe
2o
3+ 141.84KJ, i.e. 1 mole of FeO reaction, the heat energy that just can emit 141.84KJ.Like this, the Fe in iron scale
2+oxidizing reaction occurs and can promote particle diffusion bonding, the heat of generation can make particle in rhombohedral iron ore lattice also can spread obtaining under extraneous less heat, so grain growth and recrystallize fixed.Namely this part heat, higher in pelletizing inner utilization efficiency, contribute to strengthen the consolidation reaction of pellet inside, finished ball intensity is improved, meanwhile, also can make outside maturing temperature decline, Energy Intensity Reduction.
Iron scale is used for pellet formation by the present invention, can improve pellet grade on the one hand, can make full use of on the other hand iron scale this part of heat of heat release in oxidising process, effectively reduce pellet roasting temperature, reduce ring formation of rotary kiln, improve the operating rate of rotary kiln and belt type roasting machine, guarantee pelletizing High-efficient Production, extend pellet formation equipment life; Can also improve pellet strength, for stablizing pellet formation, reduce pellet formation energy consumption and have very important significance.
Of the present invention
beneficial effect:
(1) by ground hematite with addition of through fine grinding technology iron scale after treatment, proportioning is 5%-15%, reducing pellet-roasting temperature, when saving energy consumption, finished ball nodulizing intensity can also be improved, the technical barrier that maturing temperature is high, finished ball nodulizing intensity is low running into when ground hematite is produced pellet can be solved to a certain extent; (2) reduced after pellet-roasting temperature, greatly alleviated rotary kiln Yin Gaowen and ring formation, belt type roasting machine fire grate bar such as burns out at the problem that affects operating rate; (3) method provided by the invention is widely used in grate kiln, belt type roasting machine, shaft furnace production pelletizing process, is particularly useful for using the pellet formation enterprise that ground hematite is raw material.
Embodiment
Further illustrate the present invention below by embodiment, but be not limited to following examples.
comparative example:the iron scale powder with addition of fine grinding technology processing not in ground hematite:
The concrete steps of preparing ground hematite pellet by present method are as follows:
(1) batching:
Ground hematite and wilkinite are prepared burden by following weight percent:
98.5 parts of ground hematites
1.5 parts of wilkinites
Wherein ground hematite is Lvliang City's fine iron breeze, and FeO content is 3.1%, and the content that granularity is less than 0.074mm is 92%, and the water ratio of ground hematite is 8.9%.
(2) mixing, pelletizing:
Said components mixes through powerful mixer, then adds in balling disc and produces, and obtains water ratio and be 9.2% green pellets, and median size is 10mm-16mm left and right;
(3) cloth, roasting:
On grate kiln, carry out cloth, roasting, obtain finished ball nodulizing;
When rotary kiln baking temperature is 1230 ℃, finished ball nodulizing intensity is a 1895N ∕ pelletizing; Process energy consumption is 32.74kg mark coal/t.
When rotary kiln baking temperature is 1250 ℃, finished ball nodulizing intensity is a 2050N ∕ pelletizing; Process energy consumption is 33.87kg mark coal/t.
When rotary kiln baking temperature is 1270 ℃, finished ball nodulizing intensity is a 2281N ∕ pelletizing; Process energy consumption is 35.16kg mark coal/t.
Described in the present embodiment 1 part is 1kg.
embodiment 1:in ground hematite with addition of through the pretreated iron scale powder of fine grinding:
The concrete steps of preparing ground hematite pellet by present method are as follows:
(1) iron scale powder fine grinding pre-treatment:
Choose iron scale powder: Taiyuan Iron and Steel Co. steel scale of steel rolling powder, its FeO content is 56%;
By the fine grinding in pulverising apparatus of above-mentioned iron scale powder, the ratio that its granularity is less than 0.1mm is 65%;
(2) batching:
The pretreated iron scale powder of fine grinding, ground hematite and wilkinite are prepared burden by following weight percent:
5 parts, fine grinding iron scale powder
93.5 parts of ground hematites
1.5 parts of wilkinites,
Each component weight sum is 100 parts, and wherein ground hematite source is with implementing 1.
(3) mixing, pelletizing:
Above-mentioned each component mixes through powerful mixer, then adds in balling disc and produces pelletizing, obtains the pellet that water ratio is by weight percentage 9.1%, and median size is 10mm-16mm left and right;
(4) cloth, roasting:
On grate kiln, carry out cloth, roasting, obtain finished ball nodulizing;
When rotary kiln baking temperature is 1200 ℃, finished ball nodulizing intensity is a 2051N ∕ pelletizing; Process energy consumption is 30.85kg mark coal/t.
When rotary kiln baking temperature is 1230 ℃, finished ball nodulizing intensity is a 2171N ∕ pelletizing; Process energy consumption is 31.54kg mark coal/t.
When rotary kiln baking temperature is 1250 ℃, finished ball nodulizing intensity is a 2285N ∕ pelletizing; Process energy consumption is 32.68kg mark coal/t.
Described in the present embodiment 1 part is 1kg.
Embodiment 1 is identical with ground hematite and bentonite material source used in comparative example, and after fine grinding iron scale powder, under identical maturing temperature condition, finished ball intensity is improved.Reduce to 1230 ℃ at maturing temperature, ultimate compression strength is greater than 2000N/.And when maturing temperature is 1200 ℃, finished ball nodulizing intensity still can reach a 2051N ∕ pelletizing.
embodiment 2:in ground hematite, with addition of through the pretreated iron scale powder of fine grinding, and further strengthen it with addition of ratio:
The concrete steps of preparing ground hematite pellet by present method are as follows:
(1) iron scale powder fine grinding pre-treatment:
The pretreatment process of iron scale is identical with embodiment 1;
(2) batching:
The pretreated iron scale powder of fine grinding, ground hematite and wilkinite are prepared burden by following weight percent:
15 parts, fine grinding iron scale powder
83.3 parts of ground hematites,
1.7 parts of wilkinites,
Each component weight sum is 100 parts, and wherein the raw material sources such as ground hematite are identical with embodiment 1.
(3) mixing, pelletizing:
Above-mentioned each component mixes through powerful mixer, then adds in balling disc and produces pelletizing, obtains the pellet that water ratio is by weight percentage 9.0%, and median size is 10mm-16mm left and right;
(4) cloth, roasting:
On grate kiln, carry out cloth, roasting, obtain finished ball nodulizing;
When rotary kiln baking temperature is 1200 ℃, finished ball nodulizing intensity is a 2119N ∕ pelletizing; Process energy consumption is 28.69kg mark coal/t.
When rotary kiln baking temperature is 1230 ℃, finished ball nodulizing intensity is a 2287N ∕ pelletizing; Process energy consumption is 29.52kg mark coal/t.
When rotary kiln baking temperature is 1250 ℃, finished ball nodulizing intensity is a 2508N ∕ pelletizing; Process energy consumption is 30.67kg mark coal/t.
Described in the present embodiment 1 part is 1kg.
Embodiment 2 compared with embodiment 1, improve fine grinding iron scale powder after ratio, under identical maturing temperature condition, finished ball intensity is further improved.(on average reduce process energy consumption and be 2.06kg mark coal/t), improved ground hematite pellet strength reducing in production energy consumption.
embodiment 3:in ground hematite, with addition of through the pretreated iron scale powder of fine grinding, and further improve its fineness:
The concrete steps of preparing ground hematite pellet by present method are as follows:
(1) iron scale powder fine grinding pre-treatment:
By the fine grinding in pulverising apparatus of iron scale powder, its ratio that is less than 0.1mm is 72%;
(2) batching:
The pretreated iron scale powder of fine grinding, ground hematite and wilkinite are prepared burden by following weight percent:
10 parts, fine grinding iron scale powder
88.5 parts of ground hematites,
1.5 parts of wilkinites,
Each component weight sum is 100 parts, and wherein the raw material sources such as ground hematite are identical with embodiment 1.
(3) mixing, pelletizing:
Above-mentioned each component mixes through powerful mixer, then adds in balling disc and produces pelletizing, obtains the pellet that water ratio is by weight percentage 9.0%, and median size is 10mm-16mm left and right;
(4) cloth, roasting:
On grate kiln, carry out cloth, roasting, obtain finished ball nodulizing;
When rotary kiln baking temperature is 1200 ℃, finished ball nodulizing intensity is a 2195N ∕ pelletizing; Process energy consumption is 28.58kg mark coal/t.
When rotary kiln baking temperature is 1230 ℃, finished ball nodulizing intensity is a 2298N ∕ pelletizing; Process energy consumption is 29.38kg mark coal/t.
When rotary kiln baking temperature is 1250 ℃, finished ball nodulizing intensity is a 2547N ∕ pelletizing; Process energy consumption is 30.51kg mark coal/t.
Described in the present embodiment 1 part is 1kg.
Embodiment 3, compared with embodiment 2, improves after the fineness of fine grinding iron scale powder, and under identical maturing temperature condition, finished ball intensity is further improved, and production energy consumption is further reduced.
Claims (3)
1. a method of utilizing iron scale to reduce pellet formation energy consumption, comprise batching, mixing, pelletizing, cloth, roasting, process for cooling, it is characterized in that: in described proportioning process, in ground hematite with addition of iron scale powder, being made through fine grinding pre-treatment by iron scale, is 5%-15% with addition of ratio.
2. the method for utilizing iron scale to reduce pellet formation energy consumption according to claim 1, is characterized in that: comprise the following steps:
(1) iron scale pre-treatment:
Iron scale is carried out to fine grinding processing, and the product content that granularity is less than 0.01mm reaches more than 65%;
(2) batching:
Fine grinding iron scale powder, ground hematite and wilkinite are prepared burden by following weight percent, and concrete proportioning is:
Fine grinding iron scale powder 5% ~ 15%
Ground hematite 84.5% ~ 93%,
Wilkinite 0.5 ~ 2%,
Each composition weight sum is 100%;
(3) mixing, pelletizing:
Above-mentioned each component admixtion, after powerful mixer mixes, is transported to pelletizing in balling disc, and obtaining water ratio is 8.8% ~ 9.5%, the green-ball that median size is 10mm ~ 16mm;
(4) cloth, roasting:
Qualified green-ball is transported on drying grate and is carried out after cloth, drying and preheating, enter in rotary kiln and carry out roasting, rotary kiln baking temperature is 1200-1250 ℃;
(5) cooling:
From rotary kiln, pellet is out sent into central cooler and is cooled to 150 ℃ of left and right, obtains finished ball nodulizing.
3. the method for utilizing iron scale to reduce pellet formation energy consumption according to claim 2, it is characterized in that: prepare pellet according to the method, ground hematite pellet finished ball intensity still can reach 2050 N/ more than ball, and pellet formation Energy Intensity Reduction 2～4kg marks coal/t.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106636622A (en) * | 2016-11-10 | 2017-05-10 | 内蒙古包钢钢联股份有限公司 | Preparation method for oxidized pellet ore raw materials and oxidized pellet ore |
| CN109295299A (en) * | 2018-12-10 | 2019-02-01 | 宝钢湛江钢铁有限公司 | A method of high bloodstone self fluxed pellet is prepared using rotary kiln technology addition lime stone |
| CN111676368A (en) * | 2020-06-19 | 2020-09-18 | 太原钢铁(集团)有限公司 | Pellet production method for reducing agglomeration proportion of pellets |
| CN112410540A (en) * | 2020-11-27 | 2021-02-26 | 山西太钢不锈钢股份有限公司 | Preparation method of magnesium pellet and magnesium pellet |
| CN113355510A (en) * | 2021-05-24 | 2021-09-07 | 北京科技大学 | Pellet based on secondary resources such as scrap iron and preparation method thereof |
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| CN101463421A (en) * | 2009-01-16 | 2009-06-24 | 湖南华菱湘潭钢铁有限公司 | Method for producing pellet ore by adding iron scale |
| JP2010163656A (en) * | 2009-01-15 | 2010-07-29 | Kobe Steel Ltd | Method for producing iron-ore pellet |
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Patent Citations (3)
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| US4055390A (en) * | 1976-04-02 | 1977-10-25 | Molten Metal Engineering Co. | Method and apparatus for preparing agglomerates suitable for use in a blast furnace |
| JP2010163656A (en) * | 2009-01-15 | 2010-07-29 | Kobe Steel Ltd | Method for producing iron-ore pellet |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106636622A (en) * | 2016-11-10 | 2017-05-10 | 内蒙古包钢钢联股份有限公司 | Preparation method for oxidized pellet ore raw materials and oxidized pellet ore |
| CN109295299A (en) * | 2018-12-10 | 2019-02-01 | 宝钢湛江钢铁有限公司 | A method of high bloodstone self fluxed pellet is prepared using rotary kiln technology addition lime stone |
| CN111676368A (en) * | 2020-06-19 | 2020-09-18 | 太原钢铁(集团)有限公司 | Pellet production method for reducing agglomeration proportion of pellets |
| CN111676368B (en) * | 2020-06-19 | 2021-05-18 | 太原钢铁(集团)有限公司 | Pellet production method for reducing agglomeration proportion of pellets |
| CN112410540A (en) * | 2020-11-27 | 2021-02-26 | 山西太钢不锈钢股份有限公司 | Preparation method of magnesium pellet and magnesium pellet |
| CN112410540B (en) * | 2020-11-27 | 2023-01-31 | 山西太钢不锈钢股份有限公司 | Preparation method of magnesium pellet and magnesium pellet |
| CN113355510A (en) * | 2021-05-24 | 2021-09-07 | 北京科技大学 | Pellet based on secondary resources such as scrap iron and preparation method thereof |
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| CN103789537B (en) | 2015-07-15 |
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