CN104726696B - Middle basicity deep-bed sintering production method - Google Patents
Middle basicity deep-bed sintering production method Download PDFInfo
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Abstract
The present invention relates to a kind of middle basicity deep-bed sintering production method.Its sintered material percentage by weight is：Limonite 50~56%, iron scale 5%, dedusting ash 2~6%, sintering machine are returned mine 12~14%, BF return fines 11~15%, dolomite dust 4~5%, lime 4~5%, coal dust 3~5%；2.5~3.5min of mixed pelletization time；Grate-layer material bed of material thickness 100mm, raw materials for sintering thickness 900mm~1000mm；1050 ± 20 DEG C of firing temperature, 1.5~1.8min of sintering time, 13~15Kpa of sintering negative pressure；11~16Kpa of negative pressure, cold wind rate≤40% are cooled down, after cooling below 250 DEG C of sintering deposit temperature；The present invention can reduce raw materials for sintering cost, improve thickness of feed layer, improve the bed of material and breathe freely, improve sintering deposit yield rate, increase sintering output, realize that sintered, energy saving lowers consumption.
Description
Technical field
The present invention relates to sintering deposit production field, specifically a kind of middle basicity deep-bed sintering production method.
Background technology
1980s, domestic major iron and steel enterprises increased sintering production capacity by improving sintering material layer thickness, but mostly
Number enterprise sintering material layer thickness is only in 750~850mm, and such deep-bed sintering production can not meet the development of blast furnace maximization
Situation, seriously restricts blast fumance.For example, certain company possesses 1 160m2Step-by-step type sintering machine and 2 120m2Step-by-step movement is sintered
Machine, sintering material layer thickness is controlled in 600~800mm always, and sintering material layer thickness is relatively thin, and sintering finished rate is relatively low, only left 70%
It is right.
In recent years, indivedual large iron and steel enterprises start more than the 900mm bed of materials as research direction, but implementation result is not
Ideal, permeability of sintering material bed is poor, is also easy to produce sintering raw material, and sintering deposit yield rate is low.
CN200710027492 discloses a kind of heavy-duty material inlay sintering process production technique, it is intended to substitutes traditional thin bed of material and burns
Knot, so-called thin bed of material sintering material layer thickness 350mm is brought up to the target that 450mm sinter beds are the inventions, is mainly led to
Cross configuration, cloth, igniting and the air feed control realization of furnace charge.But learn that the universal bed of material of current steel mill is thick by above-mentioned understanding
Degree is in 750~850mm, and the invention has been difficult to meet existing demand in technology controlling and process, if manufactured using the inventive method
Sintering deposit will produce a large amount of sintering raw material, powder, and because invention moisture control is 5%, not made on sintering feed temperature
It is required that, it can cause that sintering feed gas permeability is very poor in process of production, also dry concentrate and part back powder are being used in terms of furnace charge outfit,
Dispensing is coarse, can not meet the situation for matching somebody with somebody ore deposit diversification now, so the invention can't resolve the life of 900mm~1000mm deep bed sinterings
Production. art.
CN201410209026 discloses a kind of super thick bed of material sintering method being applied in process for making, teaches and passes through
Substantial amounts of technological transformation and operation progress, make sintering material layer thickness arrive 900mm, improve sinter quality, optimize yield and quality and
Consumption indicators.What it was used in terms of scrap build is existing technology, the sealing of increase sintering machine tail, material-loosing apparatus transformation etc.,
There is not any novelty, and scrap build infusion of financial resources is big, using various measuring instruments, belt transformation, when increase is safeguarded
Between, it can virtually improve cost.The invention simultaneously does not propose substantial optimization in technical operation flow, lacks technique ginseng
Several supports, it is as follows that it produces problem：
1. quick lime carries out consumption before adding be that each producer, in the technological means taken, does not possess creativeness at present；
The atomization 2. mixer adds water, particularly with regard to control water control temperature, control mixing material granularity does not propose optimization.
3. control of the sintering machine in sintering process is automatically controlled by instrument, but when not proposing sintering machine speed, sintering
Between, vertical sintering speed, the control range of the technological parameter such as firing temperature.
4. it is proposition dispensing kind, proportion scheme in terms of sintered material.
In summary, permeability of sintering material bed is poor, is also easy to produce sintering raw material, quantity of return mines increase.Sintering iron charge kind is answered
It is miscellaneous, difficulty is brought to dispensing, while being had a major impact to grade of sinter stability.Topmost problem is that sinter bed is carried
Not stabilized sinter quality and yield are gone up, blast furnace process is constrained.
The content of the invention
Present invention seek to address that the above mentioned problem that prior art is present, and sintering material layer thickness can be improved by providing one kind,
Ensure permeability of sintering material bed, improve the middle basicity deep-bed sintering production method of sintering deposit yield rate.
The present invention solves described problem, and the technical scheme of use is：
A kind of middle basicity deep-bed sintering production method, including sintered material, mixed pelletization, cloth, igniting sintering, cooling
Process, it is characterised in that：
Sintered material：By sintering deposit finished product meet basicity R=1.60~1.65, TFe content >=54% requirement, weight percent
Than for：Limonite 50~56%, iron scale 5%, dedusting ash 2~6%, sintering machine return mine 12~14%, BF return fines 11~15%,
Dolomite dust 4~5%, lime 4~5%, coal dust 3~5%；
Mixed pelletization：2~3min of mixing time；2.5~3.5min of Granulation time；
Cloth：Grate-layer material bed of material 100mm, raw materials for sintering thickness 900mm~1000mm；
Igniting sintering：1050 ± 20 DEG C of firing temperature, 1.5~1.8min of sintering time, 13~15Kpa of sintering negative pressure；
Cooling：11~16Kpa of negative pressure, cold wind rate≤40% are cooled down, after cooling below 250 DEG C of sintering deposit temperature；
Crushing and screening：It is required that granularity is returned mine less than 5mm for sintering machine, 5~10mm is grate-layer material, and 10~20mm burns for finished product
Ramming material.
Using the present invention of above-mentioned technical proposal, compared with prior art, its advantage is：
The present invention changes by increasing sintering material layer thickness, and to mixed pelletization, igniting sintering and cooling condition as optimization
Become so that the effect enhancing of sinter bed auto accumulation heat, be conducive to improving sintering gas permeability, improve sinter quality and yield,
Reduce fuel consumption.Specific effect is as follows：
1. raw materials for sintering temperature is in 60~70 DEG C of scopes so that raw materials for sintering temperature is more than dew-point temperature, reduction sintering
Excessive moistening layer thickness, reduces gas-flow resistance, improves permeability of sintering material bed.
2. under the conditions of 1050 ± 20 DEG C of firing temperatures, sintering time is controlled in 1.5~1.8min, and sintering time is short, has
Beneficial to raising usage factor.
3. sintering deposit yield rate reaches more than 85%, realizes TFe：>=54%, TFe coefficient of stabilization：89%；Basicity R=1.60~
1.65, basicity coefficient of stabilization：92%；Rotary drum coefficient：>=72%, RDI+3.15≤72%, FeO contents 7.58% ~ 10.86%, FeO is qualified
Rate >=90%.
4. finished product sinter basicity is basicity R=1.60~1.65, is middle alkalinity sintered ore, it is possible to decrease pelletizing, lump ore are used
Amount, further reduces blast furnace ironmaking cost.
5. sintering deposit finished product SiO25.72%~5.93%, MgO2.58%~5.93%, Al2O31.91%~1.98%,
FeO7.58%~10.86%.
6. it can realize that the sintering machine daily output improves 528t, deep-bed sintering reduction solid fuel consumption reduction 0.88Kg/t,
Power consumption reduces by 1.66 degree/t.
Preferably, further technical scheme of the invention is：
By weight percentage, the limonite component is：TFe 56~62.33, SiO2 3~7, CaO 0.02~0.4,
MgO 0.13~0.83, Al2O3 1.7~2.44, H2O 7.7~10.91, other are scaling loss.
The iron scale is the iron scale that steel billet is produced in the operation of rolling, and TFe contents are 71.32%~73.4%.
The dolomite dust, lime, the granularity ＜ 3.2mm of coal dust qualification rate are 80~85%；The limonite granularity exists
3~8mm scopes for more than 85%.
Feed moisture content in the mixed pelletization process is 7~8%, 60~70 DEG C of material temperature；Granularity of pelletizing is 5~8mm
Level accounts for the 80% of gross weight.
In the cloth material process, operated during cloth without binder, sintering machine material device only plays smooth raw materials for sintering
Charge level is acted on.
In the igniting sintering circuit, sintering machine speed：1.25~1.38m/min, it is vertical to burn speed：22.5~27.6mm/
min。
Brief description of the drawings
Fig. 1 is embodiment of the present invention sintering process flow chart；
In figure：1- sintered material processes, 2- compounding process, 3- granulation process, 4- cloth material process, 5- igniting sintering circuits,
6- refrigerating work procedures, 7- broken process, 8- screening processes.
Embodiment
The present invention is further elaborated with reference to embodiments, but these embodiments do not constitute any limit to the present invention
System.
Technological process is carried out following embodiments as shown in Figure 1.
Embodiment 1：
Sintered material percentage by weight：Limonite 52%, BF return fines 14%, sintering machine return mine 14%, dedusting ash 1%, oxidation
Iron sheet 5%, dolomite dust 5%, lime 5%, coal dust 4%；
Raw material mixed pelletization, mixing time 2.5min, Granulation time 2.5min, it is ensured that raw material material temperature are carried out after the completion of dispensing
60~70 DEG C, water content 7~8%；
Grate-layer material thickness 100mm during raw material cloth, raw materials for sintering thickness 900mm, cloth is operated without binder；
1050 ± 20 DEG C of firing temperature, duration of ignition 1.5min, sintering negative pressure 15KPa；Sintering machine speed：1.25m/min, hangs down
It is straight to burn speed：22.5mm/min；
Cooled down after terminating, cool down 11~16Kpa of negative pressure, air leak rate of air curtain ＜ 40%, sintering deposit temperature 250 after cooling
Below DEG C.
Last crushing and screening, granularity is returned mine for sintering machine less than 5mm and carry out dispensing with ferrous material again, and 5~10mm is
Grate-layer material, 10~20mm is finished product sintering feed.
The performance indications such as sintering deposit granularmetric composition, drum strength are analyzed, obtained finished product sintering deposit TFe=
55.31%, 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 percentage by weight：Limonite 53%, BF return fines 12%, sintering machine return mine 12%, dedusting ash 6%, oxidation
Iron sheet 5%, dolomite dust 4%, lime 4.5%, coal dust 3.5%；
Raw material mixed pelletization, mixing time 3min, Granulation time 3min are carried out after the completion of dispensing, it is ensured that 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 is operated without binder；
105 ± 20 DEG C of firing temperature, duration of ignition 1.7min, sintering negative pressure 15KPa；Sintering machine speed：1.36m/min, hangs down
It is straight to burn speed：26.66mm/min；
Cooled down after terminating, cool down 11~16Kpa of negative pressure, air leak rate of air curtain ＜ 40%, sintering deposit temperature 250 after cooling
Below DEG C；
Last crushing and screening, granularity is returned mine for sintering machine less than 5mm and carry out dispensing with ferrous material again, and 5~10mm is
Grate-layer material, 10~20mm is finished product sintering feed.
The performance indications such as sintering deposit granularmetric composition, drum strength are analyzed.Obtained finished product sintering deposit TFe=
55.46%, 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 percentage by weight：Limonite 54.5%, BF return fines 11%, sintering machine are returned mine 13%, dedusting ash 3%, oxygen
Change iron sheet 5%, dolomite dust 4%, lime 5.5%, coal dust 4%；
Raw material mixed pelletization, mixing time 3min, Granulation time 3.5min, it is ensured that raw material material temperature 60 are carried out after the completion of dispensing
~70 DEG C, water content 7~8%；
Grate-layer material thickness 100mm during raw material cloth, raw materials for sintering thickness 1000mm, cloth is operated without binder；
105 ± 20 DEG C of firing temperature, duration of ignition 1.5min, sintering negative pressure 15KPa；Sintering machine speed：1.38m/min, hangs down
It is straight to burn speed：27.6mm/min；
Cooled down after terminating, cool down 11~16Kpa of negative pressure, air leak rate of air curtain ＜ 40%, sintering deposit temperature 250 after cooling
Below DEG C；
Last crushing and screening, granularity is returned mine for sintering machine less than 5mm and carry out dispensing with ferrous material again, and 5~10mm is
Grate-layer material, 10~20mm is finished product sintering feed.
The performance indications such as sintering deposit granularmetric composition, drum strength are analyzed.Obtained finished product sintering deposit TFe=
56.24%, 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 sintering deposit produced by above-described embodiment, TFe contents, sintering basicity R values, rotary drum coefficient, reduced powder
Rate, FeO contents can be realized in effective scope in foregoing invention.
Preferable feasible embodiment of the invention is the foregoing is only, not thereby limits to the interest field of the present invention,
Within the equivalence changes that all utilization present specifications are made, the interest field for being both contained in the present invention.
Claims (1)
1. a kind of middle basicity deep-bed sintering production method, including sintered material, mixed pelletization, cloth, igniting sintering, bosher
Sequence, it is characterised in that：
Sintered material：By sintering deposit finished product meet basicity R=1.60~1.65, TFe content >=54% requirement, percentage by weight
For：Limonite 50~56%, iron scale 5%, dedusting ash 2~6%, sintering machine are returned mine 12~14%, BF return fines 11~15%, white
Marble dust 4~5%, lime 4~5%, coal dust 3~5%；By weight percentage, limonite component is：TFe 56~62.33,
SiO2 3~7, CaO 0.02~0.4, MgO 0.13~0.83, Al2O3 1.7~2.44, H2O 7.7~10.91, other are burning
Damage；Iron scale is the iron scale that steel billet is produced in the operation of rolling, and TFe contents are 71.32~73.4%；It is dolomite dust, white
Ash, the granularity ＜ 3.2mm of coal dust qualification rate are 80~85%；Limonite granularity is more than 85% in 3~8mm scopes；
Mixed pelletization：Feed moisture content in mixed pelletization process is 7~8%, 60~70 DEG C of material temperature；Granularity of pelletizing is 5~8mm
Grade accounts for the 80% of gross weight；2~3min of mixing time；2.5~3.5min of Granulation time；
Cloth：Grate-layer material bed of material 100mm, raw materials for sintering thickness 900mm~1000mm；
Igniting sintering：In sintering circuit of lighting a fire, sintering machine speed：1.25~1.38m/min, it is vertical to burn speed：22.5~27.6mm/
min；1050 ± 20 DEG C of firing temperature, 1.5~1.8min of sintering time, 13~15Kpa of sintering negative pressure；
Cooling：11~16Kpa of negative pressure, cold wind rate≤40% are cooled down, after cooling below 250 DEG C of sintering deposit temperature；
Crushing and screening：It is required that granularity is returned mine less than 5mm for sintering machine, 5~10mm is grate-layer material, and 10~20mm sinters for finished product
Material.
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| 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 |
| CN106337119B (en) * | 2016-09-12 | 2018-06-26 | 鞍钢股份有限公司 | Sintering ignition method for ultra-thick material layer by adopting presintering |
| CN106350665B (en) * | 2016-09-12 | 2018-12-04 | 鞍钢股份有限公司 | Ultra-thick material layer sintering method adopting presintering and capable of reducing sintering return ore rate |
| CN109957651B (en) * | 2019-05-10 | 2020-10-27 | 唐山瑞丰钢铁（集团）有限公司 | Sintering production method for adjusting thickness of bedding 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 |
| CN114993053B (en) * | 2022-04-11 | 2024-04-30 | 重庆钢铁股份有限公司 | Sintering shutdown operation method |
| 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 |
| CN115652078A (en) * | 2022-11-04 | 2023-01-31 | 四川德胜集团钒钛有限公司 | Ore return mosaic sintering process |
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| CN103215443B (en) * | 2013-05-21 | 2014-04-23 | 唐山瑞丰钢铁（集团）有限公司 | High-ore-matching-ratio brown iron ore sintering technology |
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