CN102399979A - Manufacturing method of low-alkalinity agglomerate - Google Patents
Manufacturing method of low-alkalinity agglomerate Download PDFInfo
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- CN102399979A CN102399979A CN2011103548086A CN201110354808A CN102399979A CN 102399979 A CN102399979 A CN 102399979A CN 2011103548086 A CN2011103548086 A CN 2011103548086A CN 201110354808 A CN201110354808 A CN 201110354808A CN 102399979 A CN102399979 A CN 102399979A
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Abstract
The invention relates to a manufacturing method of low-alkalinity agglomerate, comprising the following steps of: burdening, briquetting, material mixing and sintering. The manufacturing method is characterized in that: acidic briquettes with the grain size of 7-10mm, which are prepared from iron concentrate powder through pressing, are added to a sintering mixture, wherein the proportion of the acidic briquettes in the mixture is 20-50 percent. The manufacturing method comprises the specific steps of: (1) pressing the iron concentrate powder with the moisture content of 8 percent into the acidic briquettes with the granularity of 7-10mm; (2) burdening the components in parts by weight: 10-35 parts of iron concentrate powder 1, 30-60 parts of iron concentrate powder 2, 10-20 parts of return fines from a blast furnace, 8-13 parts of fusing agent and 4-6 parts of fuels; (3) uniformly mixing the components in the step (2) to obtain a high-alkalinity sintering mixture with the water content of 7.5-8.5 percent; (4) mixing the acidic briquettes obtained in the step (1) with the high-alkalinity sintering mixture to obtain an acid-base mixture, wherein the acidic briquettes account for 20-40 percent by weight of the acid-base mixture; and (5) carrying out material distribution and sintering on the acid-base mixture obtained in the step (4) on a sintering cup to obtain the agglomerate as a finished product.
Description
Technical field:
The present invention relates to a kind of method of manufacture of low basicity sinter, said low basicity is that basicity is 1.3.
Background technology:
Normal sintering technology is after powdered iron ore, flux, fuel are prepared burden to scale, to add water, mixing then, carries out sintering as a kind of compound, obtains agglomerate.
The concrete steps of preparation sintering breeze are following:
(1) batching:
Return mine powder, flux fuel following weight per-cent of powdered iron ore and other prepared burden:
1 30 parts of fine iron breezes
2 40 parts of fine iron breezes
Return mine 15 parts in powder
13 parts of ground dolomite and coke powders
2 parts of limes
Wherein powdered iron ore 1 is Dai County's fine iron breeze, and powdered iron ore 2 is the Lanxian County fine iron breeze;
(2) mix:
Above-mentioned each component is through two sections mixer mixings, and obtaining water ratio is the mixing pellet of 8.3% (by weight percentage), and median size is 3.67mm;
(3) sintering and finished product agglomerate test verification:
Through cloth, sintered cup sintering, the treated finished product agglomerate that obtains, its finished product sinter basicity (CaO ∕ SiO
2)=1.30, barrate strength 65.1% (ISO), warm reduction degree is 65.8% in 900 ℃, sintering mine FeO content is 11.5%.
In recent years along with iron and steel enterprise develops on a large scale, partly medium-sized and small enterprises are when building blast furnace, and supporting corresponding sinter machine is that blast furnace provides basic materials, but in order to practice thrift cost of investment, not having supporting pelletizing plant to come is that blast furnace is produced acidic pellet ore.For reducing the raw materials cost of blast-furnace smelting; These enterprises do not think the pellet that the outsourcing price is high; Therefore do not take the burden structure of conventional superfluxed sinter with addition of acidic pellet ore (or lump ore); But using local low-cost fine iron breeze to produce the low basicity sinter ore deposit as far as possible, blast furnace has adopted 100% low basicity sinter, and adjusts the structure of furnace charge with addition of a small amount of silica.
This thinking has made full use of local low-cost fine iron breeze and own SINTERING PRODUCTION equipment to a certain extent, avoids the cost of the pellet of outsourcing price is rather stiff.The a large amount of adapted fine iron breezes of this low basicity sinter but the problem of bringing is, because of flux unslaked lime is few again with addition of amount, so the granulating efficiency of sinter mixture is on duty mutually; The ventilation property of sintering process also is on duty mutually, so agglomerate is of poor quality, mainly shows in order to guarantee the barrate strength of agglomerate; Increased solid-fuelled proportioning in the sinter mixture; Cause sintering mine FeO content high, metallurgical performance is also relatively poor, in addition because of local fine iron breeze SiO
2Content is high, and the nature efflorescence also often appears in agglomerate, not only can produce a large amount of powder, and more crucial is because of natural efflorescence, is equivalent to and has reduced sinter strength.
Therefore develop and a kind ofly can use fine iron breeze by vast scale, but also can produce barrate strength height, low basicity sinter technology that metallurgical performance is good, it is significant to implement low-cost ironmaking for small-sized iron and steel enterprise.
Summary of the invention:
In order to overcome the above-mentioned deficiency of existing low basicity sinter method of manufacture; The present invention provides a kind of method of manufacture of low basicity sinter; Be not less than in 66%, 900 ℃ warm reduction degree under the laboratory condition greater than 70% with present method with the sintered ore rotary drum strength of making (ISO).
The method of manufacture of this low basicity sinter comprises batching, briquetting, batch mixing and sintering, it is characterized in that, with addition of being the acid agglomerate of 7-10mm by the particle diameter of fine iron breeze compacting, the ratio of this acidity agglomerate in compound is 20 ~ 50% in sinter mixture.
Return mine powder, flux, fuel of fine iron breeze, blast furnace is mixed with the high-basicity sintering compound, and the sinter mixture of acid then agglomerate and high basicity carries out sintering as a kind of sinter mixture, obtains agglomerate, said sinter basicity (CaO ∕ SiO
2)=1.30.
The step of manufacturing of this low basicity sinter is:
(1) fine iron breeze is pressed into acid briquetting:
Water ratio is that 8% fine iron breeze is pressed into acid agglomerate on twin rollers, and its granularity is 7-10mm;
(2) sinter mixture of high basicity batching:
Be by weight ratio:
1 10 ~ 35 parts of fine iron breezes,
2 30 ~ 60 parts of fine iron breezes,
Return mine 10 ~ 20 parts in powder of blast furnace,
8 ~ 13 parts of flux,
4 ~ 6 parts of fuel;
The chemical ingredients of fine iron breeze 1 is: TFe, 65%, SiO2,7.0%, CaO, 0.5%.Ratio less than 0.074mm is 86%.
The chemical ingredients of fine iron breeze 2 is: TFe, 64.5%, SiO2,6.5%, CaO, 0.6%.Ratio less than 0.074mm is 93%.
(3) high-basicity sintering compound batching mixing:
Each component batching in the step (2) is obtained the compound that water ratio is 7.5% ~ 8.5% (by weight percentage) through two sections mixer mixings, be referred to as the high-basicity sintering compound, this high-basicity sintering compound particle diameter is 3mm ~ 4.5mm;
(4) acidic group briquetting and high-basicity sintering compound mixing:
The acid agglomerate and the high-basicity sintering compound that obtain in the step 1 are mixed, become the soda acid compound, the weight percent that wherein acid agglomerate accounts for the soda acid compound is 20 ~ 0%, and all the other are high-basicity sintering compounds;
(5) sintering:
The soda acid compound that step 4 is obtained carries out cloth, sintering on sintered cup, obtain the finished product agglomerate.
Described flux is ground dolomite, lime.
The method of manufacture of this low basicity sinter because of agglomerate is the mixture of acid agglomerate and superfluxed sinter, is compared with normal sintering technology, and the barrate strength of agglomerate can improve 1-3 percentage point, and warm reduction degree can improve 4-8% in its 900 ℃.
Beneficial effect of the present invention: after 1. will passing through the acid agglomerate and high-basicity sintering compound mixing of twin rollers compacting; Can produce the high agglomerate of warm reduction degree in the barrate strength height, 900 ℃; Can solve low basicity sinter barrate strength problem low, that warm reduction degree is low in 900 ℃ and in actual production process, needing of bringing thus to a certain extent implements the burden structure of superfluxed sinter with addition of the outsourcing acidic pellet ore, can utilize local powdered iron ore production high-quality agglomerate efficiently.2. can give full play to the production capacity more than needed of sinter machine.
It is high that the present invention is specially adapted to local fine iron breeze output, and the agglomerate production capacity is rich and do not have a small-sized iron and steel enterprise of pelletizing plant.
Embodiment:
Embodiment 1
Present embodiment is that the acid agglomerate of the smart powder compacting of 30% iron and 70% high-basicity sintering compound are mixed into low basicity sinter, and concrete steps are following:
(1) fine iron breeze is pressed into the acidic group briquetting:
The fine iron breeze 1 of 30 kg is suppressed into granularity on twin rollers be 7-10mm, basicity (CaO ∕ SiO
2The acid agglomerate of)=0.08;
(2) high-basicity sintering compound batching:
Prepare burden by weight:
1 30.5 parts of fine iron breezes
2 39 parts of fine iron breezes
Return mine 15 parts in powder of blast furnace
2 parts of ground dolomites
8.5 parts of limes
5 parts of coke powders
Wherein powdered iron ore 1 is Dai County's fine iron breeze, and powdered iron ore 2 is the Lanxian County fine iron breeze; Through the measuring and calculating, this high basicity compound behind sintering, the basicity of its agglomerate (CaO ∕ SiO
2)=1.82.
(3) high-basicity sintering compound batching is made ball:
Through two sections mixer mixings, obtaining water ratio is the high-basicity sintering mixing pellet of 7.7% (by weight percentage) according to above-mentioned each component, and the particle diameter of high-basicity sintering mixing pellet is 3.62mm;
(4) acidic group briquetting and high-basicity sintering mixing pellet mixing:
In acid agglomerate: the ratio of high-basicity sintering mixing pellet=30%:70% (weight percent) is mixed both, becomes the soda acid compound;
(5) sintering and finished product agglomerate test verification:
The soda acid compound that step (4) is obtained is through cloth, sintered cup sintering, the treated finished product agglomerate that obtains, its finished product sinter basicity (CaO ∕ SiO
2)=1.30, barrate strength 66.6% (ISO), warm reduction degree is 70.1% in 900 ℃, sintering mine FeO content is 9.3%.
Every part does in the present embodiment
1Kg.
Embodiment 2
Embodiment mainly is that the acid agglomerate of the smart powder compacting of 40% iron and 60% high-basicity sintering are mixed into sinter mixture, and the concrete steps that present embodiment prepares the sintering breeze are following:
(1) fine iron breeze is pressed into the acidic group briquetting:
It is 7-10mm that the fine iron breeze 1 of 40kg is pressed into granularity, basicity (CaO ∕ SiO
2The acid agglomerate of)=0.08;
(2) sinter mixture of high basicity batching:
The weight of fine iron breeze and flux, fuel is prepared burden in following ratio, and concrete proportioning is:
1 30 parts of fine iron breezes
2 37 parts of fine iron breezes
Return mine 15 parts in powder etc. of blast furnace
2 parts of ground dolomites
11 parts of limes
5 parts of coke powders
Wherein powdered iron ore 1 is Dai County's fine iron breeze, and powdered iron ore 2 is the Lanxian County fine iron breeze; Through the measuring and calculating, this high basicity compound behind sintering, the basicity of its agglomerate (CaO ∕ SiO
2About)=2.15.
(3) high-basicity sintering compound batching is made ball:
With two sections mixer mixings of each component batching warp in the step (2), obtaining water ratio is the high-basicity sintering mixing pellet of 7.5% (by weight percentage), and the particle diameter of this high-basicity sintering mixing pellet is 3.45mm;
(4) acidic group briquetting and high-basicity sintering mixing pellet mixing:
In acid agglomerate: the ratio of the sintered compound pellet=40%:60% (weight percent) of high basicity is mixed both, becomes the soda acid compound;
(5) sintering and finished product agglomerate test verification:
The soda acid compound that step (4) is obtained is through cloth, sintered cup sintering, the treated finished product agglomerate that obtains, its finished product sinter basicity (CaO ∕ SiO
2)=1.30, barrate strength 67.3% (ISO), warm reduction degree is 73.4% in 900 ℃, sintering mine FeO content is 9.1%.
Every part is 1 kg in the present embodiment.
Contrast embodiments of the invention 1 can be found out with background technology; After the acid agglomerate of the smart powder compacting of the iron with 30% and 70% high-basicity sintering are mixed into sinter mixture; Sintered ore rotary drum strength improves 1.5 percentage points; And warm reduction degree improves 4.3 percentage points in 900 ℃, and warm reduction degree all is improved in sintered ore rotary drum strength and 900 ℃;
Contrast embodiments of the invention 2 can be found out with background technology; After the acid agglomerate of the smart powder compacting of the iron with 40% and 60% high-basicity sintering are mixed into sinter mixture; Sintered ore rotary drum strength improves 2.2 percentage points; And warm reduction degree improves 7.6 percentage points in 900 ℃, and warm reduction degree all is improved in sintered ore rotary drum strength and 900 ℃.
Claims (2)
1. the method for manufacture of a low basicity sinter; Comprise batching, briquetting, batch mixing and sintering; It is characterized in that in sinter mixture the ratio of this acidity agglomerate in compound is 20-40% with addition of being the acid agglomerate of 7-10mm by the particle diameter of fine iron breeze compacting, concrete steps are:
(1), be that 8% fine iron breeze is pressed into acid agglomerate on twin rollers with water ratio, its granularity is 7-10mm;
(2) by weight ratio:
1 10 ~ 35 parts of fine iron breezes,
2 30 ~ 60 parts of fine iron breezes,
Return mine 10 ~ 20 parts in powder of blast furnace,
8 ~ 13 parts of flux,
4 ~ 6 parts of fuel;
Wherein, the chemical ingredients of fine iron breeze 1 is: TFe, and 65%, SiO2,7.0%, CaO, 0.5%, particle diameter is 86% less than the ratio of 0.074mm; The chemical ingredients of fine iron breeze 2 is: TFe, 64.5%, SiO2,6.5%, CaO, 0.6%; Particle diameter is 93% less than the ratio of 0.074mm;
(3), with each component batching in the step (2) through two sections mixer mixings, obtain water ratio and be by weight percentage 7.5% ~ 8.5% high-basicity sintering compound, this high-basicity sintering compound particle diameter is 3mm ~ 4.5mm;
(4), the acid agglomerate and the high-basicity sintering compound that obtain in the step 1 are mixed, become the soda acid compound, the weight percent that wherein acid agglomerate accounts for the soda acid compound is 20 ~ 0%, and all the other are high-basicity sintering compounds;
(5) the soda acid compound that step 4 is obtained carries out cloth, sintering on sintered cup, obtain low basicity sinter.
2. the method for manufacture of a kind of low basicity sinter according to claim 1 is characterized in that described flux is ground dolomite, lime.
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| CN2011103548086A CN102399979A (en) | 2011-11-10 | 2011-11-10 | Manufacturing method of low-alkalinity agglomerate |
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|---|---|---|---|
| CN2011103548086A CN102399979A (en) | 2011-11-10 | 2011-11-10 | Manufacturing method of low-alkalinity agglomerate |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103233115A (en) * | 2013-05-16 | 2013-08-07 | 山西太钢不锈钢股份有限公司 | Method for preparing agglomerate employing iron concentrate powder as primary iron charge |
| CN110055411A (en) * | 2019-05-31 | 2019-07-26 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of method of sintered cup roasting vanadium titanium globe |
| CN110629019A (en) * | 2018-06-25 | 2019-12-31 | 上海梅山钢铁股份有限公司 | Manufacturing method of ultralow-alkalinity high-strength sintered ore |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1844420A (en) * | 2006-03-14 | 2006-10-11 | 中南大学 | Method for producing sintered mineral with middle and low basicity |
| CN1924035A (en) * | 2005-09-01 | 2007-03-07 | 中南大学 | Composite agglomeration technology of iron powdered ore |
-
2011
- 2011-11-10 CN CN2011103548086A patent/CN102399979A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1924035A (en) * | 2005-09-01 | 2007-03-07 | 中南大学 | Composite agglomeration technology of iron powdered ore |
| CN1844420A (en) * | 2006-03-14 | 2006-10-11 | 中南大学 | Method for producing sintered mineral with middle and low basicity |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103233115A (en) * | 2013-05-16 | 2013-08-07 | 山西太钢不锈钢股份有限公司 | Method for preparing agglomerate employing iron concentrate powder as primary iron charge |
| CN103233115B (en) * | 2013-05-16 | 2014-12-24 | 山西太钢不锈钢股份有限公司 | Method for preparing agglomerate employing iron concentrate powder as primary iron charge |
| CN110629019A (en) * | 2018-06-25 | 2019-12-31 | 上海梅山钢铁股份有限公司 | Manufacturing method of ultralow-alkalinity high-strength sintered ore |
| CN110055411A (en) * | 2019-05-31 | 2019-07-26 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of method of sintered cup roasting vanadium titanium globe |
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Application publication date: 20120404 |