CN102181630A - Method for using paigeite powder in sintering - Google Patents
Method for using paigeite powder in sintering Download PDFInfo
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- CN102181630A CN102181630A CN 201110091298 CN201110091298A CN102181630A CN 102181630 A CN102181630 A CN 102181630A CN 201110091298 CN201110091298 CN 201110091298 CN 201110091298 A CN201110091298 A CN 201110091298A CN 102181630 A CN102181630 A CN 102181630A
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- 239000000843 powder Substances 0.000 title claims abstract description 35
- 238000005245 sintering Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 18
- 239000002994 raw material Substances 0.000 claims abstract description 22
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 18
- 238000001816 cooling Methods 0.000 claims abstract description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910052742 iron Inorganic materials 0.000 claims abstract description 9
- 238000002156 mixing Methods 0.000 claims abstract description 3
- 239000010459 dolomite Substances 0.000 claims abstract 3
- 229910000514 dolomite Inorganic materials 0.000 claims abstract 3
- 235000019738 Limestone Nutrition 0.000 claims abstract 2
- 239000006028 limestone Substances 0.000 claims abstract 2
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 22
- 239000000292 calcium oxide Substances 0.000 claims description 11
- 235000012255 calcium oxide Nutrition 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 6
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 5
- 238000009826 distribution Methods 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims description 2
- 238000005469 granulation Methods 0.000 claims 3
- 230000003179 granulation Effects 0.000 claims 3
- 238000007873 sieving Methods 0.000 claims 1
- 239000012141 concentrate Substances 0.000 abstract description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract description 4
- 229910052681 coesite Inorganic materials 0.000 abstract description 2
- 229910052906 cristobalite Inorganic materials 0.000 abstract description 2
- 239000000377 silicon dioxide Substances 0.000 abstract description 2
- 235000012239 silicon dioxide Nutrition 0.000 abstract description 2
- 229910052682 stishovite Inorganic materials 0.000 abstract description 2
- 229910052905 tridymite Inorganic materials 0.000 abstract description 2
- 239000003795 chemical substances by application Substances 0.000 abstract 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 abstract 1
- 235000011941 Tilia x europaea Nutrition 0.000 abstract 1
- 239000004571 lime Substances 0.000 abstract 1
- 230000004907 flux Effects 0.000 description 18
- 229910052796 boron Inorganic materials 0.000 description 11
- 230000008569 process Effects 0.000 description 7
- 239000008187 granular material Substances 0.000 description 6
- 239000004615 ingredient Substances 0.000 description 6
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 6
- 238000012216 screening Methods 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 230000009467 reduction Effects 0.000 description 5
- 230000015556 catabolic process Effects 0.000 description 4
- 238000006731 degradation reaction Methods 0.000 description 4
- 229910052500 inorganic mineral Inorganic materials 0.000 description 4
- 239000007791 liquid phase Substances 0.000 description 4
- 239000011707 mineral Substances 0.000 description 4
- 235000010755 mineral Nutrition 0.000 description 4
- BCWKKHAIFMOLTP-UHFFFAOYSA-N [Fe].[Mg].[B] Chemical compound [Fe].[Mg].[B] BCWKKHAIFMOLTP-UHFFFAOYSA-N 0.000 description 3
- WETINTNJFLGREW-UHFFFAOYSA-N calcium;iron;tetrahydrate Chemical compound O.O.O.O.[Ca].[Fe].[Fe] WETINTNJFLGREW-UHFFFAOYSA-N 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000004744 fabric Substances 0.000 description 3
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 238000005304 joining Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000012256 powdered iron Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000010298 pulverizing process Methods 0.000 description 2
- 230000008929 regeneration Effects 0.000 description 2
- 238000011069 regeneration method Methods 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- ORILYTVJVMAKLC-UHFFFAOYSA-N adamantane Chemical compound C1C(C2)CC3CC1CC2C3 ORILYTVJVMAKLC-UHFFFAOYSA-N 0.000 description 1
- 229910001573 adamantine Inorganic materials 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000013467 fragmentation Methods 0.000 description 1
- 238000006062 fragmentation reaction Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000002932 luster Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
- 229910003145 α-Fe2O3 Inorganic materials 0.000 description 1
- 229910006297 γ-Fe2O3 Inorganic materials 0.000 description 1
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Abstract
The invention relates to a method for using paigeite powder in sintering, and belongs to the technical field of iron ore powder sintering. The method comprises the following steps of: preparing raw materials, mixing, granulating, distributing the raw materials, igniting, sintering, crushing, cooling, and detecting indexes of sintered ore. The iron-containing raw materials of the sintered ore comprise 8 to 12 percent of paigeite, 4.5 to 5.5 percent of calcined lime, 1 to 3 percent of dolomite, 5 to 7 percent of limestone and 4.0 to 5.0 percent of coke powder; and the alkalinity CaO/SiO2 of the sintering ores is equal to between 1.8 and 2.0, TFe content in the sintered ore is between 55 and 58 percent, MgO content in the sintered ore is between 1.9 and 2.3 percent, and FeO content in the sintered ore is between 6.0 and 7.5 percent. In the method, local powder (or Australian fine powder) and a MgO mass fluxing agent (such as the dolomite) are replaced by the paigeite powder simultaneously, so the paigeite powder can be used reasonably, the total proportioning of the fluxing agent is reduced by 10 percent, the quality of the sintered ore is improved, and the concept of concentrates is met.
Description
Technical field
The invention belongs to mineral and utilize technical field, particularly relate to the method for using the ferro-boron breeze in a kind of sintering, the proportioning of paigeite in sintering reached 10%.Think that the proportioning of ferro-boron breeze has the space of further lifting.
Background technology
China's boron resource has characteristics such as reserves are abundant, kind is many, ore grade is lower, common associated mineral is many, place of production distribution imbalance.
Ludwigite (MgFe) 3Fe[BO3] theoretical content 17.83% of O2:B2O3, form has multiple crystalline forms such as needle-like, column, fibrous, short cylinder-granular aggregate; Have pearl, adamantine luster; Color has black and blackish green; Density is 3.60～4.70g/cm3, and the Mohs' hardness interval is 5.5～6.0, and is water insoluble.
The B2O3 fusing point is lower, occurs with the vitreum form usually in the industrial production, begins fusion about 600 ℃.Boron is one of element the most stable in the crystal chemistry stablizer.Because the B3+ radius is little, at high temperature can enter in the multi mineral lattice, promote calcium ferrite to generate and the polymerization of rhombohedral iron ore grain growth, reduce the growing amount of 2CaOSiO2.After adding boron in the sinter mixture, promote liquid phase to generate quantity and reduced the viscosity of sosoloid fusing point and liquid phase slag, these low melting point liquid phases are conduct bonding phase in process of cooling, parcel 2CaOSiO2 crystal grain, can suppress the heterogeneous transformation of homogeneity of 2CaOSiO2, β-2CaOSiO2 is stablized, reduce the destruction of agglomerate internal stress, the sintering ore pulverization rate is reduced, and sinter strength improves.The adding of boron magnesium iron ore concentrate has promoted the generation of agglomerate calcium ferrite and the increase of amount of liquid phase, therefore make the mineral composition and the microstructure generation considerable change of agglomerate, it is even that grain size is tending towards, intercrystalline bonding phasor increases, the agglomerate crystal is grown up, interconnect, the agglomerate grade distributes trend evenly, and the amount of powder of＜5mm reduces.The low temperature reduction degradation index that helps alleviating agglomerate with addition of boron magnesium iron ore concentrate.The the underlying cause of agglomerate generation low temperature reduction degradation be regeneration Fe2O3 in the agglomerate when low temperature (450～550 ℃), be reduced into γ-Fe2O3 by α-Fe2O3.Because the former is the trigonal system hexagonal lattice, the latter is the tesseral system cubic(al)grating, the lattice change has taken place under the effect of reducing gas, distortion, the cracking of structure have been caused, produce great internal stress, cause pulverizing serious under mechanical force to be split, the low temperature reduction degradation index of agglomerate is raise.Promote the generation of calcium ferrite in the agglomerate behind the boron magnesium iron ore concentrate, reduced regeneration Fe2O3 quantity.In addition,, a certain amount of B2O3 is arranged in the agglomerate, blast-furnace smelting is improved slag fluidity will benefit, help reducing iron loss, reduce molten iron per ton ore deposit consumption because B2O3 is a low melting point.The distribution of boracic agglomerate grade improves, intensity improves.Therefore the agglomerate behind the ferro-boron concentrate helps improving the blast furnace permeability of stock column and coal gas distributes, and helps furnace condition anterograde, helps the blast furnace volume increase, joint is burnt.
Have the meaning of improving sinter quality with addition of paigeite in the sintering, but throughout the year, be subject to the chemical ingredients of paigeite, its always being restricted in sintering with addition of ratio, paigeite is using as a kind of " additive " always.How paigeite being substituted the effect of using powdered iron ore and alternative flux always and bring into play simultaneously, is the key that improves the paigeite proportioning.
Summary of the invention
The object of the present invention is to provide the method for using the ferro-boron breeze in a kind of sintering, overcome in the past ferro-boron breeze proportioning restricted in sintering, can only (can't reach in 10% as a kind of defective of additive in proportioning, sinter quality and composition improve simultaneously), use paigeite to substitute MgO matter flux simultaneously and (, the proportioning of paigeite in sintering reached 10% as rhombspar and powdered iron ore.
The present invention includes: batching, mixing, cloth, igniting, sintering, hot fragmentation, hot screening, cooling, screening, sintering performance detect.The following technical parameter of control in technology:
1) raw material is equipped with: use the paigeite of 8-12% in the iron-bearing material, unslaked lime 4.5-5.5%, rhombspar 1-3%, Wingdale 5-7%, coke powder 4.0-5.0%; The basicity CaO/SiO of this agglomerate simultaneously
2=1.8-2.0, TFe content are 55-58%, and MgO content is 1.9-2.3%, and FeO content is 6.0-7.5%;
2) mix: selected material component is transported in drum mixer, adds an amount of moistening material of moisture, the water distribution quantity of raw material is controlled between 7 ± 0.5%, and raw material is mixed;
3) granulate: the raw material that mixes is transported in the secondary drum mixer granulates, time 2-3min granulates;
4) cloth: the feed particles after will granulating evenly dispenses on the sintering pallet, and the gauge control that makes sinter bed is in the scope of 500-800mm;
5) igniting: control sinter machine ignition temperature be 950-1200 ℃, ignition time 1-3min, the igniting negative pressure is 5000-7000Pa;
6) sintering: after ignition of sintering process finished, the coke powder in the raw material took fire, and control sintering negative pressure is 7000-12000Pa;
7) cooling: adopt cooling or the outer cooling mode of machine on any machine, the temperature of agglomerate is reduced to below 200 ℃;
8) screening: adopting sieve aperture is that the vibratory screening apparatus of the 4.5-6mm particle after to cooling process sieves, and screen underflow is a sinter return fine, and screen overflow is the finished product agglomerate.
9) the agglomerate index detects: size composition, barrate strength to agglomerate detect and analyze.
Behind paigeite, the quality of agglomerate does not worsen, and improvement is to a certain degree arranged on the contrary.
SiO
2Content is 4.0-4.5%, basicity CaO/SiO
2Be 1.8-2.0, by improving the method (bringing up to 5.0-6.0%) of dosage of coke from 3.0-4.0%, the FeO content of agglomerate is brought up to 8-10% from 5-6%, thereby make tumbler index (bringing up to 83.6%), the low temperature reduction degradation index (RDI of agglomerate from 82%
+ 3.15Bring up to 51% from 39%) and reductibility index (bringing up to 85%) from 79% improve simultaneously.
(the iron charge proportioning is: 25% Australia powder A under the reference scheme condition, 30% Australia powder B, 5% Brazilian powder A, 15% Brazilian powder B and 10% local powder E, 15% blast furnace is returned mine, flux is for joining outward, unslaked lime 5%, rhombspar 5.45%, Wingdale 4.95%), when using paigeite to substitute local powder E or Australia powder A, reduce the proportioning of MgO matter flux (rhombspar), adjust the Wingdale proportioning, make the paigeite proportioning reach 8-12%, local powder or Australia's powder ratio correspondingly reduce 8-12%, the rhombspar proportioning is reduced to 2-3% from 4-5%, and proportion design agglomerate chemical ingredients is: TFe 55-58%, FeO 6-7.5%, CaO 9-11%, SiO
24.9-5.2%, MgO 1.9-2.3%, Al
2O
31.7-2.0%.Finally, when using paigeite to substitute local powder or Australia fine powder, also substitute MgO matter flux, realized resources effective utilization and flux minimizing.
The invention has the advantages that:
1, use the lower paigeite of price to substitute local powder or Australia fine powder, reduced simultaneously MgO matter flux with addition of amount, realized low-quality resources effective utilization;
2, behind the reduction MgO matter flux, though the proportioning of rhombspar may improve with the stabilized sinter chemical ingredients, the integral body of flux reduces with addition of amount, and this meets the thought of fine fodder and minimizing.
Description of drawings
Fig. 1 is the preparation method's with addition of a paigeite agglomerate of the present invention process flow sheet.
Fig. 2 substitutes the principle schematic of local powder (or Australia's powder) and rhombspar for expression paigeite of the present invention.
Embodiment
The present invention is described in further detail below in conjunction with the drawings and specific embodiments:
As shown in the figure, agglomerate preparation technology distance of the present invention roughly is divided into: raw material outfit-mixing-granulation-cloth-igniting-sintering-fragmentation-cooling-agglomerate index detection etc., and its concrete operations step is as follows:
1) raw material is equipped with: from paigeite proportioning 8-12%, and unslaked lime 4.5-5.5%, rhombspar 1-3%, Wingdale 5-7%, coke powder 4.0-5.0%; The basicity CaO/SiO of this agglomerate simultaneously
2=1.8-2.0, TFe content are 55-58%, and MgO content is 1.9-2.3%, and the feed composition of choosing a kind of concrete numerical value in the scope of FeO content 6.0-7.5% is standby;
2) mix: selected material component is transported in drum mixer, adds an amount of moistening material of moisture, the water distribution quantity of raw material is controlled between 7 ± 0.5%, and raw material is mixed;
3) granulate: the raw material that mixes is transported in the secondary drum mixer granulates, time 2-3min granulates;
4) cloth: the feed particles after will granulating evenly dispenses on the sintering pallet, and the gauge control that makes sinter bed is in the scope of 500-800mm;
5) igniting: control sinter machine ignition temperature be 950-1200 ℃, ignition time 1-3min, the igniting negative pressure is 5000-7000Pa;
6) sintering: after ignition of sintering process finished, the coke powder in the raw material took fire, and control sintering negative pressure is 7000-12000Pa;
7) cooling: adopt cooling or the outer cooling mode of machine on any machine, the temperature of agglomerate is reduced to below 200 ℃;
8) screening: adopting sieve aperture is that the vibratory screening apparatus of the 4.5-6mm particle after to cooling process sieves, and screen underflow is a sinter return fine, and screen overflow is the finished product agglomerate.
9) the agglomerate index detects: size composition, barrate strength to agglomerate detect and analyze.
According to above-mentioned technical process, the present invention has finished the prepared in laboratory of agglomerate, and wherein every specific targets of agglomerate are participated in table 1 to table 6.
Table 1 and 2 has been listed the chemical ingredients and the proportioning of ferric charge, flux and coke powder respectively.2# and 3# are expression two schemes of the present invention in the table.
Table 3 is the sintering cup test result.4 and table 5 be respectively the size composition and the chemical ingredients result of agglomerate.
Table 6 is the comparison that each scheme agglomerate uses the flux ratio.
Table 1
| Title | TFe | SiO 2 | Al 2O 3 | CaO | MgO | FeO | Scaling loss |
| Australia powder A | 62.00 | 4.52 | 2.40 | 0.26 | 0.18 | 0.86 | 4.58 |
| Australia powder B | 58.00 | 5.35 | 1.95 | 1.14 | 0.30 | 0.82 | 10.38 |
| Brazil powder C | 66.00 | 1.78 | 1.33 | 0.12 | 0.01 | 0.57 | 3.38 |
| Brazil powder D | 64.05 | 3.44 | 1.53 | 0.02 | 0.02 | 0.50 | 2.50 |
| Local powder E | 66.66 | 6.03 | 0.43 | 0.35 | 0.19 | 24.29 | -1.80 |
| Ferro-boron breeze F | 57.65 | 4.16 | 0.23 | 1.33 | 7.33 | 25.14 | 2.22 |
Table 2
Annotate: the iron charge proportioning is 100%, and flux and coke powder are for joining outward.
Table 3
Table 4
| Test number | ＞40mm | 40-25mm | 25-16mm | 16-10mm | 10-5mm | ＜5mm |
| Benchmark | 21.94 | 21.07 | 6.28 | 15.73 | 14.38 | 20.59 |
| 1# | 23.91 | 19.55 | 6.54 | 15.33 | 15.19 | 19.48 |
| 2# | 23.71 | 18.69 | 6.74 | 16.56 | 16.15 | 18.14 |
| 3# | 23.82 | 18.83 | 6.48 | 15.59 | 16.67 | 18.62 |
Table 5
| Test number | TFe | FeO | CaO | SiO2 | MgO | Al2O3 | R |
| Benchmark | 56.49 | 6.54 | 10.02 | 5.13 | 2.17 | 1.86 | 1.95 |
| 1# | 56.51 | 6.39 | 9.89 | 5.07 | 2.18 | 1.86 | 1.95 |
| 2# | 56.54 | 6.54 | 9.77 | 5.01 | 2.16 | 1.86 | 1.95 |
| 3# | 56.39 | 6.90 | 9.87 | 5.06 | 2.19 | 1.76 | 1.95 |
Table 6
| Test number | Benchmark | 1# | 2# | 3# |
| Flux is with addition of amount | 15.4 | 14.6 | 13.75 | 14.05 |
| Flux reduces usage quantity | 0 | 0.8 | 1.65 | 1.35 |
By table 3 as seen, with addition of the ferro-boron breeze, when reducing the ratio of local powder or Australia's powder, reduce the proportioning of rhombspar, the yield rate of agglomerate, tumbler index and utilization coefficient etc. all less than worsening, make moderate progress on the contrary.
By table 4 and table 5 as seen, the size composition of 2# and 3# agglomerate and chemical ingredients are all less than worsening.
By table 6 as seen,, when reducing the ratio of local powder or Australia's powder, reduce the proportioning of rhombspar, finally make agglomerate flux always descend to some extent with addition of amount with addition of the ferro-boron breeze.Total proportioning of flux has reduced 10%.
See on the whole, use the lower paigeite of price to substitute local powder or Australia fine powder, reduced simultaneously MgO matter flux with addition of amount, finally when having realized that low-quality resources effective is utilized, make the integral body of flux reduce, met the thought of fine fodder and minimizing with addition of amount.
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| CN102816924A (en) * | 2012-09-25 | 2012-12-12 | 鞍钢股份有限公司 | Ore blending method for improving thermal state strength index of sintered ore |
| CN103451418A (en) * | 2013-09-07 | 2013-12-18 | 鞍钢股份有限公司 | Production method of sintered ore |
| 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 |
| CN107365907A (en) * | 2017-06-27 | 2017-11-21 | 西安建筑科技大学 | A kind of method for improving iron ore sintering mine low temperature reduction degradation |
| CN107459341A (en) * | 2017-07-18 | 2017-12-12 | 海城利尔麦格西塔材料有限公司 | A kind of magnesia carbon brick and production method by the use of paigeite as additive |
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| CN103572043B (en) * | 2012-07-25 | 2016-12-07 | 上海梅山钢铁股份有限公司 | The production method of low basicity sinter |
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| CN109439820A (en) * | 2018-11-29 | 2019-03-08 | 安徽工业大学 | A kind of blast furnace process raw material and its smelting process |
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