CN102586591A - Process for producing sintered ore for ironmaking through blast furnace from high-aluminum limonite - Google Patents
Process for producing sintered ore for ironmaking through blast furnace from high-aluminum limonite Download PDFInfo
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- CN102586591A CN102586591A CN2012100615276A CN201210061527A CN102586591A CN 102586591 A CN102586591 A CN 102586591A CN 2012100615276 A CN2012100615276 A CN 2012100615276A CN 201210061527 A CN201210061527 A CN 201210061527A CN 102586591 A CN102586591 A CN 102586591A
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Abstract
The invention discloses a process for producing sintered ore for ironmaking through a blast furnace from high-aluminum limonite. The high-aluminum limonite accounts for 60%-70% of the weight of iron-containing raw material, and fine particle magnetite concentrate accounting for 25%-35% of the weight of the iron-containing raw material is mixed into the iron-containing raw material. The process comprises the following steps of: performing blending, mixing and pelletizing treatment on the iron-containing raw material, a solvent and coke powder; performing sintering, material distribution, ignition, sintering, cooling and particle adjustment on a pelletized mixture to get a finished product of the sintered ore, determining the alkalinity of a sintered mixture according to the requirement of smelting of the blast furnace on the alkalinity, wherein the ordinary range of the alkalinity is 1.7-2.1; and mixing limestone, dolomite and quicklime into the mixture for regulating the alkalinity, wherein the mixing weight of the quicklime is 1-4%. The adding of the fine particle magnetite concentrate can effectively improve the pelletizing effect of the high-aluminum limonite, significantly improve the sintering air permeability, greatly reduce the using quantity of the coke powder, improve the metallogenic conditions during the sintering process of the high-aluminum limonite, effectively improve the quality indexes of the sintered ore and realize the application of the high-aluminum limonite in sintering production.
Description
Technical field
The present invention relates to a kind of technology of utilizing high alumolimonite production blast furnace ironmaking with agglomerate.
Background technology
Make a general survey of under the present domestic iron-smelting process condition; The guiding theory that each iron and steel enterprise uses as raw material with " fine fodder policy " usually; Guarantee quality through purchasing high-quality ore into furnace charge; But in today of iron ore deposit growing tension, along with reducing gradually of high-quality ore deposit deposit and rising violently of price, blast furnace production cost pressure is huge.On the contrary; Some iron and steel enterprises abandon the traditional thought of " instructing the purchasing of raw materials by processing condition "; Initiatively exploitation is to the utilisation technology of inferior raw material, and its use to cheap raw material inferior has become the main mode that reduces the blast furnace production cost, and effect very significantly.
For domestic steel industry, lacking the proven technique support is to cause smelting iron using raw material to receive the immediate cause of serious restriction, also is one of basic factor that is absorbed in recent years international iron ore raw material price negotiation predicament.Receive the restriction of domestic iron ore raw material quality and total amount, each iron and steel enterprise increases the import volume of external iron ore year by year, and dependency is also more and more stronger.In the imported iron ore, originate from the Al that contains on ground such as Australia, Indonesia, India
2O
3Higher ore has accounted for larger proportion, and relative low price, its iron grade (TFe) be usually 54%～60%, SiO
2Content is less, but Al in the ore deposit
2O
3Height, part ore deposit Al
2O
3Even up to more than 6%, present ore-dressing technique also can't realize the efficient dealuminzation to iron ore.If can realize the efficient application of high alumina iron ore in sintered ironmaking is produced, will strong technical support be provided for China changes purchasing of raw materials thought, open up the new way that reduces cost, improves the output value for domestic steel industry simultaneously.
For reducing the enterprise production cost, improve agglomerate yield and quality index.Domestic existing part iron factory attempts using high alumolimonite in SINTERING PRODUCTION.Ma Gang has carried out high Al under its material condition
2O
3The experimental study situation of content sinter performance.The result shows, as agglomerate Al
2O
3Be elevated at 1.63% o'clock by 1.43%, can productivity of sinter, burnup made moderate progress through Optimization Ore Matching and high alumina iron ore.Continue rising Al
2O
3By 1.83% o'clock, can keep productivity of sinter constant through increasing mixed carbon comtent, but tumbler index slightly descend, burnup rises to some extent.With Al
2O
3Be elevated at 2.09% o'clock, increase mixed carbon comtent, only can keep productivity of sinter constant, tumbler index obviously descends, burnup rises.Anshan iron and steel plant has carried out the research of sintering basic characteristic to a kind of Australia iron ore that contains high crystal water, high alumina under laboratory condition.See that from chemical ingredients the full iron grade in this ore deposit is lower, dioxide-containing silica is higher, Al
2O
3Content (7.3%) superelevation, harmful element are few, crystal water content high, scaling loss is big.Test-results shows, increases with this ore deposit proportioning, and warm reduction degree improves in the agglomerate, but proportioning is 15% o'clock, and benefit descends significantly.Sintering is all feasible on addition of this ore deposit from Technological Economy, but proportioning is unsuitable too high, and the suggestion sintering uses this ore deposit ratio not surpass 15%, is advisable with about 10%.
Overall height alumolimonite agglomerating yield and quality index can not be satisfactory in agglutinating test, and the coke powder consumption is also bigger.Test is adopted and to be allocated the smart powder of part particulate magnet into and carry out sintering, again through Optimization Ore Matching, regulate basicity, allocate measure such as unslaked lime into and can further improve sintering yield and quality index.
Therefore, the sintering method of the high alumolimonite of high mixture ratio is used in exploitation in SINTERING PRODUCTION, under the prerequisite that guarantees sintering yield and quality index, reduces the enterprise production cost, can effectively alleviate high-quality iron ore deposit situation in short supply simultaneously.
Summary of the invention
Technical problem to be solved by this invention provides a kind of high alumolimonite that can in agglomeration for iron mine is produced, use high mixture ratio, reduces the high alumolimonite of utilizing of enterprise production cost and produces the technology of blast furnace ironmaking with agglomerate.
In order to solve the problems of the technologies described above; The technology of utilizing high alumolimonite production blast furnace ironmaking with agglomerate provided by the invention; High alumolimonite accounts for 60%～70% of iron-bearing material quality; In iron-bearing material, allocate 25%～35% the particulate magnetite concentrate that accounts for the iron-bearing material quality into, iron-bearing material is prepared burden with flux, coke powder, is mixed, pelletization treatment; The granulation compound is taped against on the sinter machine light a fire, sintering, cooling, obtain the finished product agglomerate through whole grain, according to blast-furnace smelting the needs of basicity are confirmed basicity in the sinter mixture batching, the basicity scope is 1.7～2.1.
The grade of described particulate magnetite concentrate is that 60%～65% ,-200 order grades account for more than 70%.
Employing is allocated Wingdale, rhombspar or unslaked lime into and is regulated basicity.
The quality of allocating into of unslaked lime is 1～4%.
Adopt the high alumolimonite of utilizing of technique scheme to produce the technology of blast furnace ironmaking with agglomerate, the sintering process condition is certain, is igniting negative pressure 5KPa; Sintering negative pressure 8KPa, ignition time 1.5min, soaking time 1.0min; 1050 ℃ of ignition temperatures are expected high 700mm.Allocate part particulate magnetite concentrate in the high alumolimonite into, can effectively improve sintering yield and quality index.The particulate magnetite concentrate allocate following three advantages into: the one, effectively improved the granulating efficiency of sintered material, and then improved the sintering ventilation property; The 2nd, high alumolimonite will produce a large amount of liquid phases and worsen SINTERING PRODUCTION with addition of the coke powder of high mixture ratio in sintering process; Employing effectively reduces the coke powder consumption with addition of the segment magnet concentrate; Both reduced the sintering cost; Realize sintering under the lesser temps again, helped the formation of calcium ferrite in the agglomerate; The 3rd, the variation of crystalline network is followed in the oxidation of magnetite in the sintering process; The magnetite crystal is a tesseral system; And rhombohedral iron ore is a hexagonal system; Lattice variations in the oxidising process and newborn plane of crystal atom have higher transfer ability, help between adjacent particle, forming brilliant key, thereby improve sinter strength.Therefore, compare, allocate the smart powder of part particulate magnet into and can effectively improve sintering yield and quality index with high alumolimonite simple ore sintering.Three kinds of high alumolimonites reasonably combined, under the sintering process condition of confirming, make its assimilation performance, liquid phase flow sex index, calcium ferrite generative capacity and iron ore self consolidation strength and bonding mutually index such as intensity reach best; Generally believe, suitably improve basicity in the high alumina iron ore sintering and can improve sinter strength that so in these sintering examination basicity 1.8,1.9,2.0 tests, agglomerate yield and quality index was more excellent when the result showed basicity 1.8, basicity 2.0 is taken second place, and basicity 1.9 is relatively poor.Think that vast scale limonite sintering and high aluminum sinter all will consume a large amount of heats; Improve basicity simultaneously and need increase amount of lime; And the decomposition of Wingdale also need consume great amount of heat energy, and the sintering that therefore proposes the high alumolimonite of vast scale was unsuitable for high-basicity sintering; Allocate an amount of unslaked lime into and help strengthen granulating and cutting down the consumption of energy, and in digestive process the preheating sinter mixture, improve the sintering index.Compare with normal sintering; Through in high alumolimonite, allocating the smart powder of certain proportion particulate magnet into; And Optimization Ore Matching, adjusting basicity and allocate measures such as unslaked lime into; High alumolimonite can bring up to 60%～70% with addition of ratio in sinter mixture, the gained agglomerate can satisfy the medium blast furnace production requirement, has realized the efficient application of high alumina iron ore.
Embodiment
Below in conjunction with embodiment the present invention is described further.
Reference examples 1:
Basicity 1.9 is not allocated the particulate magnetite concentrate into, Al
2O
3Mass content is that 9.65% high alumolimonite simple ore agglomerating optimal processing parameter and yield and quality index are: dosage of coke 6.1%, and mixture moisture 11.0%, the yield rate of agglomerate is 67.81%, and barrate strength is 54.47%, and utilization coefficient is 0.98tm
-2H
-1
Reference examples 2:
Basicity 1.9 is not allocated the particulate magnetite concentrate into, Al
2O
3Mass content is that 11.12% high alumolimonite simple ore agglomerating optimal processing parameter and yield and quality index are: dosage of coke 6.7%, and mixture moisture 11.5%, the yield rate of agglomerate is 71.19%, and barrate strength is 59.00%, and utilization coefficient is 0.94tm
-2H
-1
Reference examples 3:
Basicity 1.9 is allocated 25% particulate magnetite concentrate into, and three kinds high alumolimonite proportionings are Al
2O
3Mass content is 9.65% high alumolimonite: Al
2O
3Mass content is 11.12% high alumolimonite: Al
2O
3Mass content is 3.02% a high alumolimonite=45: 10: 15; Agglomerating optimal processing parameter and yield and quality index are: dosage of coke 6.1%, and mixture moisture 8.5%, the yield rate of agglomerate is 73.46%; Barrate strength is 55.87%, and utilization coefficient is 1.02tm
-2H
-1
Embodiment 1:
High alumolimonite accounts for 60% of iron-bearing material quality, allocates mass content into and be 25% particulate magnetite concentrate, and the grade of particulate magnetite concentrate is 60% to account for more than 70% with-200 order grades; Wingdale is allocated in employing into, rhombspar is regulated basicity 1.9, and agglomerating optimal processing parameter and yield and quality index are: dosage of coke 5.8%, mixture moisture 8.5%; The sintering process condition is igniting negative pressure 5KPa, sintering negative pressure 8KPa, ignition time 1.5min; Soaking time 1.0min, 1050 ℃ of ignition temperatures are expected high 700mm; The yield rate of agglomerate is 72.29%, and barrate strength is 56.13%, and utilization coefficient is 1.10tm
-2H
-1
Embodiment 2:
High alumolimonite accounts for 65% of iron-bearing material quality, allocates mass content into and be 25% particulate magnetite concentrate, and the grade of particulate magnetite concentrate is 62%;-200 order grades account for more than 70%, allocate mass content into and be 2% unslaked lime, and the CaO mass content of unslaked lime is 75%; Wingdale is allocated in employing into, rhombspar is regulated basicity 1.8; Agglomerating optimal processing parameter and yield and quality index are: dosage of coke 5.8%, and mixture moisture 9.0%, the yield rate of agglomerate is 74.26%; Barrate strength is 58.53%, and utilization coefficient is 1.17tm
-2H
-1
Embodiment 3:
High alumolimonite accounts for 65% of iron-bearing material quality, allocates mass content into and be 30% particulate magnetite concentrate, and the grade of particulate magnetite concentrate is 64.20%;-200 order grades account for more than 70%, allocate mass content into and be 3% unslaked lime, and the CaO mass content of unslaked lime is 76.21%; Wingdale is allocated in employing into, rhombspar is regulated basicity 2.0, and agglomerating optimal processing parameter and yield and quality index are: dosage of coke 5.6%, mixture moisture 8.5%; The sintering process condition is igniting negative pressure 5KPa, sintering negative pressure 8KPa, ignition time 1.5min; Soaking time 1.0min, 1050 ℃ of ignition temperatures are expected high 700mm; The yield rate of agglomerate is 73.99%, and barrate strength is 57.33%, and utilization coefficient is 1.18tm
-2H
-1
Embodiment 4:
High alumolimonite accounts for 70% of iron-bearing material quality, allocates mass content into and be 30% particulate magnetite concentrate, and the grade of particulate magnetite concentrate is 65%;-200 order grades account for more than 70%, allocate mass content into and be 4% unslaked lime, and the CaO mass content of unslaked lime is 85%; Wingdale is allocated in employing into, rhombspar is regulated basicity 1.9, and agglomerating optimal processing parameter and yield and quality index are: dosage of coke 5.6%, mixture moisture 9.5%; The sintering process condition is igniting negative pressure 5KPa, sintering negative pressure 8KPa, ignition time 1.5min; Soaking time 1.0min, 1050 ℃ of ignition temperatures are expected high 700mm; The yield rate of agglomerate is 74.58%, and barrate strength is 58.13%, and utilization coefficient is 1.25tm
-2H
-1
Embodiment 5:
High alumolimonite accounts for 65% of iron-bearing material quality, allocates mass content into and be 35% particulate magnetite concentrate, and the grade of particulate magnetite concentrate is 64.20%;-200 order grades account for more than 70%, allocate mass content into and be 1% unslaked lime, and the CaO mass content of unslaked lime is 76.21%; Wingdale is allocated in employing into, rhombspar is regulated basicity 2.1, and agglomerating optimal processing parameter and yield and quality index are: dosage of coke 5.8%, mixture moisture 8.5%; The sintering process condition is igniting negative pressure 5KPa, sintering negative pressure 8KPa, ignition time 1.5min; Soaking time 1.0min, 1050 ℃ of ignition temperatures are expected high 700mm; The yield rate of agglomerate is 73.99%, and barrate strength is 57.33%, and utilization coefficient is 1.18tm
-2H
-1
Embodiment 6:
High alumolimonite accounts for 70% of iron-bearing material quality, allocates mass content into and be 30% particulate magnetite concentrate, and the grade of particulate magnetite concentrate is 65%;-200 order grades account for more than 70%, allocate mass content into and be 3.5% unslaked lime, and the CaO mass content of unslaked lime is 84%; Wingdale is allocated in employing into, rhombspar is regulated basicity 1.7, and agglomerating optimal processing parameter and yield and quality index are: dosage of coke 5.6%, mixture moisture 9.5%; The sintering process condition is igniting negative pressure 5KPa, sintering negative pressure 8KPa, ignition time 1.5min; Soaking time 1.0min, 1050 ℃ of ignition temperatures are expected high 700mm; The yield rate of agglomerate is 74.58%, and barrate strength is 58.13%, and utilization coefficient is 1.25tm
-2H
-1
Claims (4)
1. one kind is utilized high alumolimonite to produce the technology of blast furnace ironmaking with sintering deposit; It is characterized in that: high alumolimonite accounts for 60%～70% of iron-bearing material quality; In iron-bearing material, allocate 25%～35% the particulate magnetite concentrate that accounts for the iron-bearing material quality into, iron-bearing material is prepared burden with flux, coke powder, is mixed, pelletization treatment; The granulation compound is taped against on the sintering machine light a fire, sintering, cooling, obtain the finished product sintering deposit through whole grain, based on blast furnace process the needs of basicity are confirmed basicity in the sinter mixture batching, the basicity scope is 1.7～2.1.
2. the technology of utilizing high alumolimonite production blast furnace ironmaking with agglomerate according to claim 1, it is characterized in that: the grade of described particulate magnetite concentrate is that 60%～65% ,-200 order grades account for more than 70%.
3. the technology of utilizing high alumolimonite production blast furnace ironmaking with agglomerate according to claim 1 and 2, it is characterized in that: employing is allocated Wingdale, rhombspar or unslaked lime into and is regulated basicity.
4. the technology of utilizing high alumolimonite production blast furnace ironmaking with agglomerate according to claim 3, it is characterized in that: the quality of allocating into of described unslaked lime is 1～4%.
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| CN103572043A (en) * | 2012-07-25 | 2014-02-12 | 上海梅山钢铁股份有限公司 | Production method of agglomerate with low alkalinity |
| CN106702145A (en) * | 2015-07-21 | 2017-05-24 | 宝山钢铁股份有限公司 | Method for intensifying sintering of limonite with high content of crystal water |
| CN108642272A (en) * | 2018-06-04 | 2018-10-12 | 山西建龙实业有限公司 | A kind of brown ocher high mixture ratio sintering method |
| 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 |
| CN113981211A (en) * | 2021-10-14 | 2022-01-28 | 张家港宏昌钢板有限公司 | Sintering method of high-proportion limonite |
| CN116162786A (en) * | 2023-03-15 | 2023-05-26 | 重庆大学 | Additive for improving sintering of high-proportion high-alumina iron ore powder and application thereof |
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| CN108642272A (en) * | 2018-06-04 | 2018-10-12 | 山西建龙实业有限公司 | A kind of brown ocher high mixture ratio sintering method |
| 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 |
| CN113981211A (en) * | 2021-10-14 | 2022-01-28 | 张家港宏昌钢板有限公司 | Sintering method of high-proportion limonite |
| CN116162786A (en) * | 2023-03-15 | 2023-05-26 | 重庆大学 | Additive for improving sintering of high-proportion high-alumina iron ore powder and application thereof |
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Application publication date: 20120718 |