CN104726696A - Medium-alkali thick blanking layer sintering and producing method - Google Patents
Medium-alkali thick blanking layer sintering and producing method Download PDFInfo
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Abstract
The invention relates to a medium-alkali thick blanking layer sintering and producing method. The sintering materials comprise, by weight, 50-56% of brown iron ore, 5% of oxidized iron sheet, 2-6% of fly ash, 12-14% of return ore of a sintering machine, 11-15% of return ore of a blast furnace, 4-5% of dolomite powder, 4-5% of white ash and 3-5% of coal powder; mixing and pelleting time is 2.5-3.5 min, bedding layer is 100 mm thick, the sintering materials are 900-1000 mm thick, annealing temperature is 1050+/-20 degrees Centigrade, sintering time is 1.5-1.8 min, and sintering negative pressure is 13-15 Kpa; cooling negative pressure is 11-16 Kpa, cold air rate is smaller than or equal to 40%, and temperature of sintered ore after cooling is below 250 degrees Centigrade. By the medium-alkali thick blanking layer sintering and producing method, cost of the sintering materials can be reduced, blanking thickness is increased, permeability of the blanking layer is improved, yield and production of the sintered ore are increased and energy consumption is reduced in sintering.
Description
Technical field
The present invention relates to agglomerate production field, specifically basicity deep-bed sintering production method in one.
Background technology
The eighties in 20th century, domestic each big steel enterprise increased sintering production capacity by improving sintering material layer thickness, but most enterprises sintering material layer thickness is only at 750 ~ 850mm, such deep-bed sintering produces the development situation that can not meet blast furnace and maximize, and seriously restricts blast fumance.Such as, certain company has 1 160m
2step-by-step type sintering machine and 2 120m
2step-by-step type sintering machine, sintering material layer thickness controls at 600 ~ 800mm always, and sintering material layer thickness is thinner, and sintering finished rate is lower, only about 70%.
In recent years, indivedual large iron and steel enterprise starts using more than the 900mm bed of material as research direction, but implementation result is unsatisfactory, and permeability of sintering material bed is poor, and easily produce sintering raw material, agglomerate yield rate is low.
CN200710027492 discloses a kind of heavy-duty material inlay sintering process production technique, be intended to alternative traditional thin bed of material sintering, so-called thin bed of material sintering material layer thickness 350mm, brought up to the target that 450mm sinter bed is this invention, mainly by the configuration of furnace charge, cloth, igniting and air feed control realization.But learn that the general bed thickness of current steel mill is at 750 ~ 850mm by above-mentioned understanding, this invention has been difficult to meet existing demand in technology controlling and process, if adopt this inventive method manufacture agglomerate to produce sinter raw material in a large number, powder, and because this invention moisture controlled is 5%, requirement is not made about sintered material temperature, sintered material ventilation property can be made in process of production very poor, furnace charge outfit aspect is also in the dry concentrate of use and part back powder, prepare burden coarse, can not meet the situation of joining now ore deposit diversification, so this invention can't resolve 900mm ~ 1000mm deep bed sintering production technique.
CN201410209026 discloses a kind of super thick bed of material sintering method be applied in process for making, teaches by a large amount of technological transformations and operation progress, makes sintering material layer thickness to 900mm, improve sinter quality, optimize yield and quality and consumption indicators.What it adopted in scrap build is all existing technology, increases sintering machine tail sealing, material-loosing apparatus transformation etc., does not have any novelty, and scrap build infusion of financial resources is large, adopts various surveying instrument, belt is transformed, increase maintenance time, virtually can raise the cost.This invention simultaneously does not all propose substantial optimization in technical operation flow, and lack the support of processing parameter, it has problems as follows:
1. unslaked lime carries out consuming before adding is the technique means that current each producer is all taking, and does not possess creativeness;
2. mixing machine adds water atomization, specifically about control water control temperature, controls compound granularity and does not all propose to optimize.
3. the control of sinter machine in sintering process is controlled automatically by instrument, but does not all propose to sinter machine speed, sintering time, vertical sintering speed, the span of control of the processing parameters such as ignition temperature.
4. be proposition batching kind, proportion scheme in sintered material.
In sum, permeability of sintering material bed is poor, easily produces sintering raw material, quantity of return mines increase.Sintering iron charge kind is complicated, bring difficulty to batching, has material impact to grade of sinter stability simultaneously.Topmost problem is, sinter bed promotes the not stabilized sinter Quality and yield that gets on, and constrains blast-furnace smelting.
Summary of the invention
The present invention is intended to the problems referred to above solving prior art existence, and provides one can improve sintering material layer thickness, ensures permeability of sintering material bed, improves the middle basicity deep-bed sintering production method of agglomerate yield rate.
The present invention solves described problem, and the technical scheme of employing is:
Basicity deep-bed sintering production method in one, comprises sintered material, mixed pelletization, cloth, igniting sintering, refrigerating work procedure, it is characterized in that:
Sintered material: the requirement meeting basicity R=1.60 ~ 1.65, TFe content >=54% by agglomerate finished product, weight percent is: limonite 50 ~ 56%, iron scale 5%, dedusting ash 2 ~ 6%, sinter machine return mine 12 ~ 14%, BF return fines 11 ~ 15%, ground dolomite 4 ~ 5%, lime 4 ~ 5%, coal dust 3 ~ 5%;
Mixed pelletization: mixing time 2 ~ 3min; Granulation time 2.5 ~ 3.5min;
Cloth: grate-layer material bed of material 100mm, raw materials for sintering thickness 900mm ~ 1000mm;
Igniting sintering: ignition temperature 1050 ± 20 DEG C, sintering time 1.5 ~ 1.8min, sintering negative pressure 13 ~ 15Kpa;
Cooling: cooling negative pressure 11 ~ 16Kpa, cold wind rate≤40%, agglomerate temperature less than 250 DEG C after cooling;
Crushing and screening: requiring that granularity is less than 5mm is that sinter machine is returned mine, and 5 ~ 10mm is grate-layer material, and 10 ~ 20mm is finished product sintered material.
Adopt the present invention of technique scheme, compared with prior art, its beneficial effect is:
The present invention is by increasing sintering material layer thickness, and do to optimize change to mixed pelletization, igniting sintering and cooling conditions, the effect of sinter bed auto accumulation heat is strengthened, is conducive to improving sintering ventilation property, improve sinter quality and output, reduce fuel consumption.Concrete effect is as follows:
1. raw materials for sintering temperature is 60 ~ 70 DEG C of scopes, makes raw materials for sintering temperature more than dew-point temperature, reduces sintered wet layer thickness, reduces gas-flow resistance, improves permeability of sintering material bed.
2. under 1050 ± 20 DEG C of ignition temperature conditions, sintering time controls at 1.5 ~ 1.8min, and sintering time is short, is conducive to improving utilization coefficient.
3. agglomerate yield rate reaches more than 85%, realizes TFe: >=54%, TFe index of stability: 89%; Basicity R=1.60 ~ 1.65, basicity index of stability: 92%; Rotary drum coefficient: >=72%, RDI+3.15≤72%, FeO content 7.58% ~ 10.86%, FeO qualification rate >=90%.
4. finished product sinter basicity is basicity R=1.60 ~ 1.65, is middle alkalinity sintered ore, can reduce pelletizing, lump ore consumption, reduces blast furnace ironmaking cost further.
5. agglomerate finished product SiO
25.72% ~ 5.93%, MgO2.58% ~ 5.93%, Al
2o
31.91% ~ 1.98%, FeO7.58% ~ 10.86%.
6. can realize sinter machine day output and improve 528t, deep-bed sintering reduces solid fuel consumption and reduces 0.88Kg/t, and power consumption reduces by 1.66 degree/t.
As preferably, the present invention further technical scheme is:
By weight percentage, described limonite component is: TFe 56 ~ 62.33, SiO
23 ~ 7, CaO 0.02 ~ 0.4, MgO 0.13 ~ 0.83, Al
2o
31.7 ~ 2.44, H
2o 7.7 ~ 10.91, other are scaling loss.
Described iron scale is the iron scale that steel billet produces in the operation of rolling, and TFe content is 71.32% ~ 73.4%.
The qualification rate of the granularity < 3.2mm of described ground dolomite, lime, coal dust is 80 ~ 85%; Described limonite granularity is more than 85% in 3 ~ 8mm scope.
Feed moisture content in described mixed pelletization operation is 7 ~ 8%, material temperature 60 ~ 70 DEG C; Granulation granularity is that 5 ~ 8mm grade accounts for 80% of gross weight.
In described cloth material process, do not carry out binder operation during cloth, sintering machine materials device only plays the effect of smooth raw materials for sintering charge level.
In described igniting sintering circuit, sintering machine speed: 1.25 ~ 1.38m/min, vertically burns speed: 22.5 ~ 27.6mm/min.
Accompanying drawing explanation
Fig. 1 is embodiment of the present invention sintering process schema;
In figure: 1-sintered material operation, 2-compounding process, 3-granulation process, 4-cloth material process, 5-lights a fire sintering circuit, and 6-refrigerating work procedure, 7-broken process, 8-sieves operation.
Embodiment
Below in conjunction with embodiment, the present invention is further elaborated, but these embodiments do not form any restriction to the present invention.
Following embodiment is all undertaken by technical process shown in Fig. 1.
Embodiment 1:
Sintered material weight percent: limonite 52%, BF return fines 14%, sinter machine return mine 14%, dedusting ash 1%, iron scale 5%, ground dolomite 5%, lime 5%, coal dust 4%;
Carry out raw material blending granulation after having prepared burden, mixing time 2.5min, Granulation time 2.5min, ensure raw material material temperature 60 ~ 70 DEG C, water content 7 ~ 8%;
Grate-layer material thickness 100mm during raw material cloth, raw materials for sintering thickness 900mm, cloth does not carry out binder operation;
Ignition temperature 1050 ± 20 DEG C, ignition time, 1.5min, sintered negative pressure 15KPa; Sintering machine speed: 1.25m/min, vertically burns speed: 22.5mm/min;
Cool after terminating, cooling negative pressure 11 ~ 16Kpa, air leak rate of air curtain < 40%, agglomerate temperature less than 250 DEG C after cooling.
Last crushing and screening, it is that sinter machine is returned mine and again prepared burden with ferrous material that granularity is less than 5mm, and 5 ~ 10mm is grate-layer material, and 10 ~ 20mm is finished product sintered material.
The performance index such as agglomerate size composition, barrate strength are analyzed, the finished product agglomerate TFe=55.31% obtained, dual alkalinity R=1.63, rotary drum coefficient 73.33%, productivity of sintering machine 1.66, Al/Si=0.375, RDI+3.15=69.45, FeO=7.72 ~ 9.32%, sintering finished rate is 85.67%.
Embodiment 2:
Sintered material weight percent: limonite 53%, BF return fines 12%, sinter machine return mine 12%, dedusting ash 6%, iron scale 5%, ground dolomite 4%, lime 4.5%, coal dust 3.5%;
Carry out raw material blending granulation after having prepared burden, mixing time 3min, Granulation time 3min, ensure raw material material temperature 60 ~ 70 DEG C, water content 7 ~ 8%;
Grate-layer material thickness 100mm during raw material cloth, raw materials for sintering thickness 980mm, cloth does not carry out binder operation;
Ignition temperature 105 ± 20 DEG C, ignition time, 1.7min, sintered negative pressure 15KPa; Sintering machine speed: 1.36m/min, vertically burns speed: 26.66mm/min;
Cool after terminating, cooling negative pressure 11 ~ 16Kpa, air leak rate of air curtain < 40%, agglomerate temperature less than 250 DEG C after cooling;
Last crushing and screening, it is that sinter machine is returned mine and again prepared burden with ferrous material that granularity is less than 5mm, and 5 ~ 10mm is grate-layer material, and 10 ~ 20mm is finished product sintered material.
The performance index such as agglomerate size composition, barrate strength are analyzed.The finished product agglomerate TFe=55.46% obtained, dual alkalinity R=1.61, rotary drum coefficient 73%, productivity of sintering machine 1.65, Al/Si=0.419, RDI+3.15=70.23, FeO=8.45 ~ 10.1%, sintering finished rate is 86.32%.
Embodiment 3:
Sintered material weight percent: limonite 54.5%, BF return fines 11%, sinter machine return mine 13%, dedusting ash 3%, iron scale 5%, ground dolomite 4%, lime 5.5%, coal dust 4%;
Carry out raw material blending granulation after having prepared burden, mixing time 3min, Granulation time 3.5min, ensure raw material material temperature 60 ~ 70 DEG C, water content 7 ~ 8%;
Grate-layer material thickness 100mm during raw material cloth, raw materials for sintering thickness 1000mm, cloth does not carry out binder operation;
Ignition temperature 105 ± 20 DEG C, ignition time, 1.5min, sintered negative pressure 15KPa; Sintering machine speed: 1.38m/min, vertically burns speed: 27.6mm/min;
Cool after terminating, cooling negative pressure 11 ~ 16Kpa, air leak rate of air curtain < 40%, agglomerate temperature less than 250 DEG C after cooling;
Last crushing and screening, it is that sinter machine is returned mine and again prepared burden with ferrous material that granularity is less than 5mm, and 5 ~ 10mm is grate-layer material, and 10 ~ 20mm is finished product sintered material.
The performance index such as agglomerate size composition, barrate strength are analyzed.The finished product agglomerate TFe=56.24% obtained, dual alkalinity R=1.63, rotary drum coefficient 73.33%, productivity of sintering machine 1.66, Al/Si=0.375, RDI+3.15=69.45, FeO=8.53 ~ 10.56%, sintering finished rate is 85.71%.
The finished product agglomerate produced by above-described embodiment, TFe content, sintering basicity R value, rotary drum coefficient, reduction and pulverization ratio, FeO content all can realize in effective scope in foregoing invention.
The foregoing is only the better feasible embodiment of the present invention, not thereby limit to interest field of the present invention, the equivalence change that all utilizations description of the present invention is done, be all contained within interest field of the present invention.
Claims (7)
1. a basicity deep-bed sintering production method in, comprises sintered material, mixed pelletization, cloth, igniting sintering, refrigerating work procedure, it is characterized in that:
Sintered material: the requirement meeting basicity R=1.60 ~ 1.65, TFe content >=54% by agglomerate finished product, weight percent is: limonite 50 ~ 56%, iron scale 5%, dedusting ash 2 ~ 6%, sinter machine return mine 12 ~ 14%, BF return fines 11 ~ 15%, ground dolomite 4 ~ 5%, lime 4 ~ 5%, coal dust 3 ~ 5%;
Mixed pelletization: mixing time 2 ~ 3min; Granulation time 2.5 ~ 3.5min;
Cloth: grate-layer material bed of material 100mm, raw materials for sintering thickness 900mm ~ 1000mm;
Igniting sintering: ignition temperature 1050 ± 20 DEG C, sintering time 1.5 ~ 1.8min, sintering negative pressure 13 ~ 15Kpa;
Cooling: cooling negative pressure 11 ~ 16Kpa, cold wind rate≤40%, agglomerate temperature less than 250 DEG C after cooling;
Crushing and screening: requiring that granularity is less than 5mm is that sinter machine is returned mine, and 5 ~ 10mm is grate-layer material, and 10 ~ 20mm is finished product sintered material.
2. middle basicity deep-bed sintering production method according to claim 1, it is characterized in that, by weight percentage, described limonite component is: TFe 56 ~ 62.33, SiO
23 ~ 7, CaO 0.02 ~ 0.4, MgO 0.13 ~ 0.83, Al
2o
31.7 ~ 2.44, H
2o 7.7 ~ 10.91, other are scaling loss.
3. middle basicity deep-bed sintering production method according to claim 1, it is characterized in that, described iron scale is the iron scale that steel billet produces in the operation of rolling, and TFe content is 71.32 ~ 73.4%.
4. middle basicity deep-bed sintering production method according to claim 1, it is characterized in that, the qualification rate of the granularity < 3.2mm of described ground dolomite, lime, coal dust is 80 ~ 85%; Described limonite granularity is more than 85% in 3 ~ 8mm scope.
5. middle basicity deep-bed sintering production method according to claim 1, it is characterized in that, the feed moisture content in described mixed pelletization operation is 7 ~ 8%, material temperature 60 ~ 70 DEG C; Granulation granularity is that 5 ~ 8mm grade accounts for 80% of gross weight.
6. middle basicity deep-bed sintering production method according to claim 1, is characterized in that, in described cloth material process, do not carry out binder operation during cloth, sintering machine materials device only plays the effect of smooth raw materials for sintering charge level.
7. middle basicity deep-bed sintering production method according to claim 1, is characterized in that, in described igniting sintering circuit, sintering machine speed: 1.25 ~ 1.38m/min, vertically burns speed: 22.5 ~ 27.6mm/min.
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Cited By (7)
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| CN105950859A (en) * | 2016-07-19 | 2016-09-21 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for improving air permeability of sinter layer |
| CN106337119A (en) * | 2016-09-12 | 2017-01-18 | 鞍钢股份有限公司 | Super-thick material layer sintering ignition method adopting pre-sintering |
| CN106350665A (en) * | 2016-09-12 | 2017-01-25 | 鞍钢股份有限公司 | Ultra-thick bed sintering method for reducing sinter return ratio and employing presintering |
| CN109957651A (en) * | 2019-05-10 | 2019-07-02 | 唐山瑞丰钢铁（集团）有限公司 | Adjust the sintering production method of shop fixtures thickness of feed layer |
| CN112080632A (en) * | 2020-09-25 | 2020-12-15 | 湖南华菱湘潭钢铁有限公司 | Sintering method of super-thick material layer sintering ore |
| CN114993053A (en) * | 2022-04-11 | 2022-09-02 | 重庆钢铁股份有限公司 | Sintering shutdown operation method |
| CN115058589A (en) * | 2022-05-31 | 2022-09-16 | 天津钢铁集团有限公司 | Sintered ore production method for achieving material distribution thickness of sintering machine to be 950-1000mm |
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Cited By (12)
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| CN105950859A (en) * | 2016-07-19 | 2016-09-21 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for improving air permeability of sinter layer |
| CN105950859B (en) * | 2016-07-19 | 2017-12-22 | 攀钢集团攀枝花钢铁研究院有限公司 | Improve the method for permeability of sintering material bed |
| CN106337119A (en) * | 2016-09-12 | 2017-01-18 | 鞍钢股份有限公司 | Super-thick material layer sintering ignition method adopting pre-sintering |
| CN106350665A (en) * | 2016-09-12 | 2017-01-25 | 鞍钢股份有限公司 | Ultra-thick bed sintering method for reducing sinter return ratio and employing presintering |
| CN106337119B (en) * | 2016-09-12 | 2018-06-26 | 鞍钢股份有限公司 | A kind of super thick bed of material sintering ignition method using pre-sintering |
| CN106350665B (en) * | 2016-09-12 | 2018-12-04 | 鞍钢股份有限公司 | A kind of super thick bed of material sintering method using pre-sintering reducing sinter return fine rate |
| CN109957651A (en) * | 2019-05-10 | 2019-07-02 | 唐山瑞丰钢铁（集团）有限公司 | Adjust the sintering production method of shop fixtures thickness of feed layer |
| CN112080632A (en) * | 2020-09-25 | 2020-12-15 | 湖南华菱湘潭钢铁有限公司 | Sintering method of super-thick material layer sintering ore |
| CN114993053A (en) * | 2022-04-11 | 2022-09-02 | 重庆钢铁股份有限公司 | Sintering shutdown operation method |
| CN114993053B (en) * | 2022-04-11 | 2024-04-30 | 重庆钢铁股份有限公司 | Sintering shutdown operation method |
| CN115058589A (en) * | 2022-05-31 | 2022-09-16 | 天津钢铁集团有限公司 | Sintered ore production method for achieving material distribution thickness of sintering machine to be 950-1000mm |
| CN115058589B (en) * | 2022-05-31 | 2023-10-10 | 天津钢铁集团有限公司 | Sinter production method for realizing cloth thickness of sintering machine reaching 950 mm-1000 mm |
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