CN100529120C - Sintering method for high-chromic vanadium-titanium ferroferrite - Google Patents
Sintering method for high-chromic vanadium-titanium ferroferrite Download PDFInfo
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- CN100529120C CN100529120C CNB2007100483948A CN200710048394A CN100529120C CN 100529120 C CN100529120 C CN 100529120C CN B2007100483948 A CNB2007100483948 A CN B2007100483948A CN 200710048394 A CN200710048394 A CN 200710048394A CN 100529120 C CN100529120 C CN 100529120C
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Abstract
The invention discloses a sintering method of high-chromine typed V-Ti-bearing iron ore, which comprises the following steps: 1) allocating limestone and fined ferric ore to make grain; 2) adding water to wet; 3) putting wet and grained materials into sintering material in the mixer to ball; adding B2O3 in the composite material; 4) adding MgO in the composite material; 5) loading the composite material into sintering cup or sintering machine to sinter over 50 deg.c; increasing the content of calcium ferrite in the sintering ore by 5% and production by 4.2-5.0%.
Description
Technical field
The invention belongs to technical field of ferrous metallurgy, particularly a kind of sintering method of high-chromic vanadium-titanium ferroferrite.
Background technology
The Flos Bombacis Malabarici high-titanium type vanadium-titanium magnetite is owing to contain higher titanium, the fusing point height, and easy-sintering not, and in sintering process, generated the crisp uhligite of property etc., so sinter strength is poor, yield rate is low.Hongge Deposit is one of Panxi Diqu four big vanadium titano-magnetite mining areas, and not only the content of titanium is suitable with the Flos Bombacis Malabarici high-titanium type vanadium-titanium magnetite, and contains higher chromium, the grade (Cr of chromium
2O
30.55%～0.82%) is 8～10 times of Flos Bombacis Malabarici high-titanium type vanadium-titanium magnetite, Cr
2O
3Also be high-melting-point (2400 ℃) mineral, unique composition has determined red lattice high-chromic vanadium-titanium ferroferrite agglomerating difficulty not only greater than common ore deposit sintering, also greater than Flos Bombacis Malabarici high-titanium type vanadium-titanium magnetite sintering.
" national iron-smelting raw material academic meeting paper collection " the 184th page of (intensified-sintered several measure introductions August in 2005, works such as Dan Jiguo) having reported that Iron and Steel Research Geueral Inst unslaked lime branch adds with the fuel branch adds technology, this technology adopts wraps up in a certain proportion of lime and solid fuel outside granulation bead top layer, carry out the agglomerating method then, improved granulation bead intensity, and form local high basicity, and having generated more calcium ferrite, sinter strength significantly improves." national iron-smelting raw material academic meeting paper collection " the 108th page of (Shoudu Iron and Steel Co high basicity sinter experimental study August in 2005, works such as Zhang Jingcao) reported that Shoudu Iron and Steel Co iron work improves the testing laboratory and the commerical test research of sinter basicity, after sintering basicity brings up to 2.1 from 1.8, the quantity of agglomerate＞5mm grade rises 1.99%, barrate strength improves 2%, yield rate improves 2.29%, and utilization coefficient improves 0.009t/m
2.h, low temperature reduction degradation index drops to 23.92% by 32.16%, and soft heat drippage performance is obviously improved.(the 89th page of the 16th volume the 2nd phase of supplementary issue " mining metallurgical engineering " in October, 1996, MgO content is to the influence of intensity index in the steel agglomerate of Hunan, Zhou Renlin work) reported in sinter mixture rhombspar with addition of some amount, improve the production practice of agglomerate MgO content, when MgO content brought up to 3%～4% in the agglomerate, the agglomerate qualification rate had improved 1.7%～8.43%.Sinter strength variation after MgO content is more than 4.2%.(the 51st page of the 5th the 4th phase of volume " agglomerates of sintered pellets " in July, 1980, agglomerate adds the boron commerical test, works such as Guo Zhenyu) reported the commerical test that in agglomerate, adds boron, after boron in the agglomerate adds above 0.008%, the weathering phenomenon disappears, agglomerate cooling screening＜5mm powder is less than 2%, and barrate strength improves more than 5 percentage points, and utilization coefficient increases 0.2t/m
2.h, shelf characteric is obviously improved.
Above-mentioned all technological methods all are at common rich ore powder or common magnetite concentrate powder sintering, at chromium type high (Cr
2O
31%～2%) development research of v-ti magnetite concentrate sintering technology does not then appear in the newspapers as yet.
Summary of the invention
Technical problem to be solved by this invention provides a kind of sintering method of high-chromic vanadium titanium magnet ore concentrate, adopt this method can effectively reduce the fusing point of high-chromic vanadium titanium magnet ore concentrate sinter mixture, improve the mineral composition and the structure of agglomerate, thereby improve the quality and the output of agglomerate.
The solution that technical solution problem of the present invention is adopted is: the sintering method of high-chromic vanadium-titanium ferroferrite, and this method may further comprise the steps: 1) iron ore concentrate is granulated in advance with addition of unslaked lime, and the weight percent content of described unslaked lime is 3%～5%; 2) return mine and add water-wet in advance, the described weight percent content that adds the moisture of water-wet is 8%～10%; 3) will granulate in advance material, pre-wetting return mine be mixed with sintered material after, with sintered material mixed pelletizing in mixing machine, and in compound, add B
2O
3, described B
2O
3Weight percent content be 0.5%～1.0%; 4) add MgO in compound, behind the interpolation MgO, the weight percent content of MgO is 2.8%～3.7% in the compound; 5) compound is packed into carry out sintering in sintered cup or the sinter machine.
The invention has the beneficial effects as follows:
1) strengthens high-chromic vanadium titanium magnet ore concentrate sinter mixture granulating efficiency, improve the intensity of granulation bead, improve sintered mixture ventilation, form local high basicity, promote the generation of local compound calcium ferrite, calcium ferrite content increases more than 5 percentage points in the agglomerate, increase calcium ferrite and silicate bonding phase content in the agglomerate, improve the mineral composition and the structure of agglomerate, thereby improve the quality and the output of agglomerate, yield rate improves 1.27～3.18 percentage points, and output improves 4.2%～5.0%.
2) the sinter mixture fusing point reduces more than 50 ℃, significantly reduces the fusing point of high-chromic vanadium titanium magnet ore concentrate sinter mixture, improves sintering process, creates conditions for strengthening the high-chromic vanadium-titanium ferroferrite sintering.
3) can improve the intensity of agglomerate greatly, sintered ore rotary drum strength improves 1.09～1.56 percentage points.
4) can improve the metallurgical performance of agglomerate, help improving the technico-economical comparison of blast-furnace smelting.
Embodiment
The inventive method has been optimized processing sequence, may further comprise the steps:
1) iron ore concentrate is granulated in advance.Iron ore concentrate is granulated in advance and can be strengthened the iron ore concentrate sintered mix granulating efficiency, improves the intensity of granulation bead, improves sintered mixture ventilation; And improve the mineral composition and the structure of agglomerate, thereby improve sinter quality and output.But the unslaked lime proportioning that participates in granulation in advance is too high, and effect is bad on the contrary.The unslaked lime preferred content that the present invention participates in granulating in advance is 3%～5% (based on the weight percent content of iron ore concentrate, as follows).
2) the particulate agglomerate (returning mine) that the blast furnace sieve is returned down is wetting in advance.The pre-wetting viscosifying power that can improve fine granules of returning mine has reduced in the compound-the 0.5mm grain size content on the one hand, has improved bed permeability, and sintering velocity is increased; On the other hand, improved the degree of compactness and the intensity of granulation bead, strengthened sintering process, thereby improved sinter strength.But it is low or too high that pre-wetting moisture is crossed, and effect is all bad.The pre-wetting moisture content that the present invention returns mine is preferably 8%～10%.
3) add B
2O
3Add B
2O
3Can significantly reduce the fusing point of high-chromic vanadium titanium magnet ore concentrate sinter mixture, improve sintering process, thereby improve sinter quality and output.But B
2O
3Add too highly, sintering and ironmaking are all had a disadvantageous effect.B of the present invention
2O
3Add content and be preferably 0.5%～1.0%.
4) add MgO.Suitably improve MgO content in the agglomerate, can crystal grain thinning, improve the mineral composition and the structure of agglomerate, thereby improve the intensity and the metallurgical performance of agglomerate.But agglomerate MgO too high levels, effect is run counter to desire.The present invention makes by adding MgO that MgO content is 2.8%～3.7% in the agglomerate.
Embodiment 1:
The red lattice high-chromic vanadium of sintering titanium magnet ore concentrate, sintering basicity is 2.2, and participating in compound prefabricated grain unslaked lime content is 3%, and the pre-wetting water of returning mine is divided into 8%, B
2O
3Addition is 0.5%, and MgO content is 2.8% in the agglomerate.
The result shows, compare with base period, the sinter mixture fusing point reduces by 51 ℃, calcium ferrite content increases by 5 percentage points in the agglomerate, sintered ore rotary drum strength improves 1.09 percentage points, yield rate improves 1.27 percentage points, and output improves 4.2%, and the agglomerate low temperature reduction degradation index descends 4.03 percentage points.
Embodiment 2:
The red lattice high-chromic vanadium of sintering titanium magnet ore concentrate, sintering basicity is 2.3, and participating in compound prefabricated grain unslaked lime content is 4%, and the pre-wetting water of returning mine is divided into 9.5%, B
2O
3Addition is 0.7%, and MgO content is 3.2% in the agglomerate.
The result shows, compare with base period, the sinter mixture fusing point reduces by 58 ℃, calcium ferrite content increases by 8 percentage points in the agglomerate, sintered ore rotary drum strength improves 1.31 percentage points, yield rate improves 2.46 percentage points, and output improves 4.63%, and the agglomerate low temperature reduction degradation index descends 4.52 percentage points.
Embodiment 3:
The red lattice high-chromic vanadium of sintering titanium magnet ore concentrate, sintering basicity is 2.35, and participating in compound prefabricated grain unslaked lime content is 4.5%, and the pre-wetting water of returning mine is divided into 10%, B
2O
3Addition is 0.8%, and MgO content is 3.5% in the agglomerate.
The result shows, compare with base period, the sinter mixture fusing point reduces by 62 ℃, calcium ferrite content increases by 12 percentage points in the agglomerate, sintered ore rotary drum strength improves 1.45 percentage points, yield rate improves 3.0 percentage points, and output improves 4.81%, and the agglomerate low temperature reduction degradation index descends 5.4 percentage points.
Embodiment 4:
The red lattice high-chromic vanadium of sintering titanium magnet ore concentrate, sintering basicity is 2.4, and participating in compound prefabricated grain unslaked lime content is 5%, and the pre-wetting water of returning mine is divided into 9%, B
2O
3Adding proportioning is 1.0%, and MgO content is 3.7% in the agglomerate.
The result shows, compare with base period, the sinter mixture fusing point reduces by 70 ℃, calcium ferrite content increases by 16 percentage points in the agglomerate, sintered ore rotary drum strength improves 1.56 percentage points, yield rate improves 3.18 percentage points, and output improves 5.07%, and the agglomerate low temperature reduction degradation index descends 6.8 percentage points.
Claims (1)
1, the sintering method of high-chromic vanadium-titanium ferroferrite is characterized in that, this method may further comprise the steps:
1) iron ore concentrate is granulated in advance with addition of unslaked lime, and the weight percent content of described unslaked lime is 3%～5%;
2) return mine and add water-wet in advance, the described weight percent content that adds the moisture of water-wet is 8%～10%;
3) will granulate in advance material, pre-wetting return mine be mixed with sintered material after, with sintered material mixed pelletizing in mixing machine, and in compound, add B
2O
3, described B
2O
3Weight percent content be 0.5%～1.0%;
4) add MgO in compound, behind the interpolation MgO, the weight percent content of MgO is 2.8%～3.7% in the compound; 5) compound is packed into carry out sintering in sintered cup or the sinter machine.
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| CNB2007100483948A CN100529120C (en) | 2007-02-02 | 2007-02-02 | Sintering method for high-chromic vanadium-titanium ferroferrite |
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| CNB2007100483948A CN100529120C (en) | 2007-02-02 | 2007-02-02 | Sintering method for high-chromic vanadium-titanium ferroferrite |
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| CN100529120C true CN100529120C (en) | 2009-08-19 |
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| CN107326174A (en) * | 2017-07-04 | 2017-11-07 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of method that large-type sinterer sinters high-chromic vanadium-titanium ferroferrite |
| CN107326174B (en) * | 2017-07-04 | 2019-05-28 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of method of large-type sinterer sintering high-chromic vanadium-titanium ferroferrite |
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| CN101041867A (en) | 2007-09-26 |
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