CN103820591B - Bell type blast furnace smelting method by using small-size sinters - Google Patents
Bell type blast furnace smelting method by using small-size sinters Download PDFInfo
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- CN103820591B CN103820591B CN201410075519.6A CN201410075519A CN103820591B CN 103820591 B CN103820591 B CN 103820591B CN 201410075519 A CN201410075519 A CN 201410075519A CN 103820591 B CN103820591 B CN 103820591B
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Abstract
The invention discloses a bell type blast furnace smelting method by using small-size sinters. The method comprises the steps as follows: loading, that is, ore and coke both containing the small-size sinters are added into a bell type blast furnace; blowing, specifically, air blast kinetic energy is controlled to be 150-230kJ/s, the air blast temperature is not lower than 1,180 DEG C, and the air blast oxygen enrichment percentage is not lower than 1 percent; wherein, the small-size sinter comprises the following components by weight percentage: 45-55 percent of sinter which is 3-5 mm in particle size, 35-45 percent of sinter with particle size greater than 5 mm and 0-20 percent of sinter with particle size smaller than 3 mm. According to the bell type blast furnace smelting method by using small-sized sinter, disclosed by the invention, the defect that the small-size sinter cannot be used by a bell type blast furnace for smelting is overcome, and by regulating process parameters, the normal production is ensured and the economic benefit is improved. Moreover, the processing cost of sorting the grades of the singers is reduced by recovering the small-sized sinters in returned ore into the blast furnace for smelting. Furthermore, by adopting the small-size sinters, the state of the material shortage of blast furnace is eliminated, and the cost of raw materials is lowered.
Description
Technical field
The invention belongs to ore smelting technical field, specifically, relate to a kind of clock-type blast furnace and utilize little grade agglomerate to carry out the method for smelting.
Background technology
Little grade agglomerate refers to that in the screen underflow of blast furnace sinter ore deposit, granularity is greater than the agglomerate of 3mm, and occupies significant proportion in BF return fines.Usually, the agglomerate of grade >5mm can directly be smelted as finished product.But, owing to sieving the problem such as specification and sieve powder efficiency under finished product screen, ditch, making can not be the agglomerate of grade <5mm completely in returning mine, and that is, includes more grade >5mm and the grade little grade agglomerate at 3 ~ 5mm in returning mine.
The recycling of little grade agglomerate not only can alleviate agglomerate supply " bottleneck ", but also can avoid the waste of the energy, then for enterprise has saved a large amount of running cost.By finding BF return fines granularity trace analysis, the content that in BF return fines, grade is greater than the agglomerate of 3mm reaches 37.2%, is one very abundant " mineral reserve ".
In the prior art, under not affecting the prerequisite of smooth operation of furnace, must be without clock-type blast furnace ensureing blast furnace to utilize little grade agglomerate, and adopt polycyclic distributing, could recycle little grade agglomerate.In addition, the anti-blocking sieve-type sieve former weigh-feeder being changed into efficiency higher is also needed to sieve again, to guarantee that in little grade agglomerate, granularity is less than the ratio control of the agglomerate of 3mm about 7%, to meet blast-furnace smelting requirement.Meanwhile, also need in whole system as material inlet, vibratory screening apparatus etc. carry out transformation go forward side by side Mobile state management, unobstructed to realize system logistics.In addition, in the selection of charging method and distributing mode, need to concentrate separately the mode of charging to meet the production requirement of blast furnace, and need adjustment bottom incoming air area, improve actual wind speed and blow through center and enliven the measures such as cupola well and ensure furnace condition anterograde.Such as, when the little grade agglomerate utilizing grade at 3 ~ 5mm, need little grade agglomerate to be distributed on the endless belt at any angle of furnace throat radial direction, promote high furnace temperature direct motion with the reasonable layout improving coal gas.Therefore, without clock-type blast furnace when utilizing little grade agglomerate, make charging, cloth and pushing wind manipulation complicated.
In addition, use the document of little grade sinter grading charging, patent a lot of about bell-free blast furnaces both at home and abroad, but do not have an example to be clock-type blast furnace.Be limited to the restriction of various condition, current domestic existing clock-type blast furnace is not within minority.
Therefore, reducing costs to economize on resources, little grade agglomerate can be utilized better, be necessary to provide a kind of clock-type blast furnace to utilize the method for little grade agglomerate.
Summary of the invention
For existing the problems referred to above existed in the art, a kind of clock-type blast furnace is the object of the present invention is to provide to utilize little grade agglomerate to carry out the method for smelting.
According to an aspect of the present invention, provide a kind of clock-type blast furnace to utilize little grade agglomerate to carry out the method for smelting, described method comprises charging: join in clock-type blast furnace by the ore containing little grade agglomerate and coke; Air-supply: control blast energy is 150 ~ 230kJ/s, and blast temperature is not less than 1180 DEG C, and air blast oxygen enrichment percentage is not less than 1%; Wherein, little grade agglomerate comprises the agglomerate that the grade of 45 ~ 55% is the agglomerate of 3 ~ 5mm, the agglomerate of the grade >5mm of 35 ~ 45% and the grade <3mm of 0 ~ 20% by weight percentage.
According to one embodiment of present invention, based on the gross weight of ore, the weight of described little grade agglomerate is 0.5 ~ 10.0%.
According to one embodiment of present invention, described ore also comprises large grade agglomerate, lump ore and pellet, and when joining in clock-type blast furnace, ore bed is followed successively by large grade sintering ore bed, lump ore layer, pelletizing ore bed and little grade agglomerate layer from top to bottom.
According to one embodiment of present invention, the batch weight often criticizing ore is 20t ~ 25t, and to control coke load be 4.2t/t ~ 5.0t/t.
According to one embodiment of present invention, when carrying out cloth to ore and coke, according to first time open that great bell is distributed into OCOC, second time opens that great bell is distributed into OO, third time opens the order that great bell is distributed into OCCC and carry out circulating burden distribution; O represents ore, and C represents coke.
According to one embodiment of present invention, in the step of charging, utilize distributor ore and coke to be poured in little clock, open pressure-equalizing and discharging pipe; When the air pressure in great bell and ambient atmosphere pressure balanced, open little clock, enter in great bell to make ore and coke; Close pressure-equalizing and discharging pipe, open and all press gas pipe; When the air pressure in great bell is less than or equal to the air pressure in clock-type blast furnace, open great bell, enter in clock-type blast furnace to make ore and coke.
According to one embodiment of present invention, Ma Jishi distributor is utilized to carry out cloth to ore and coke.
According to one embodiment of present invention, described method also comprises: the furnace top pressure controlling clock-type blast furnace is 0.10 ~ 0.15MPa, and high top pressure operation rate is not less than 95%.
According to one embodiment of present invention, coke combustion intensity is 1.0 ~ 1.2t/m
3d, integrated smelting intensity is 1.4 ~ 1.5t/m
3d.
Clock-type blast furnace according to the present invention utilizes little grade agglomerate to carry out the method for smelting, and overcomes clock-type blast furnace and little grade agglomerate can not be utilized to carry out the defect of smelting, and by adjusting process parameter, ensure that normal production, improve economic benefit.In addition, entering blast-furnace smelting by reclaiming the little grade agglomerate in returning mine, decreasing the process cost of screening agglomerate grade.In addition, by utilizing little grade agglomerate to solve blast furnace materials situation in short supply, raw materials cost is reduced.
Accompanying drawing explanation
By the description to embodiment carried out below in conjunction with accompanying drawing, above-mentioned and/or other object of the present invention and advantage will become apparent, wherein:
Fig. 1 is the schematic diagram of the clock-type blast furnace burden distribution system according to exemplary embodiment of the present invention;
Fig. 2 is preparation according to the little grade agglomerate in the clock-type blast furnace of exemplary embodiment of the present invention and material loading schematic flow sheet.
Embodiment
Below the method that clock-type blast furnace of the present invention utilizes little grade agglomerate to smelt is described in detail.
For current little grade agglomerate utilisation technology or method mainly for bell-free blast furnaces, and the control of clock-type blast furnace material distribution and smelting parameter and bell-free blast furnaces make a big difference, therefore, the invention provides a kind of clock-type blast furnace utilizes little grade agglomerate to carry out the method for smelting.
The invention provides a kind of clock-type blast furnace utilizes little grade agglomerate to carry out the method for smelting, and described method comprises the steps: charging technique and air feeding technique.
The little grade agglomerate used in method of the present invention obtains by carrying out screening to returning mine.In one non-limiting embodiment, as shown in Figure 2, store the agglomerate stored in ore deposit groove 16.1 under trestle under ditch, to sinter vibratory screening apparatus 11 sieve, the agglomerate of grade >5mm directly to be fallen under ditch on the main belt 18 of material loading, is transported in feeding cart 4, the agglomerate (returning mine) of grade <5mm is returned mine on transhipment belt 17 under ditch, in the way returning sintering, appropriate location (such as, can return mine under ditch and transport after belt 17) sieving circuit is set, namely, vibratory screening apparatus 13 is adopted to reclaim the suitable little grade agglomerate in returning mine, wherein, the classification point of vibratory screening apparatus 13 is 3.0mm, the agglomerate of the middle grade >3mm that returns mine is sifted out, enter ore deposit groove 14 to store, newly-built conveyor 15.1 again, 15.2, 15.3 grades or utilize blast furnace trestle belt the independent ore deposit groove 16.4 be transported under ditch stores by the little grade agglomerate of grade >3mm in ore deposit groove 14, for blast furnace.Especially, can also return mine under ditch transhipment belt 17 below be provided with suitable funnel panel turnover device 12.When needs of returning mine sieve reclaim time, returning mine enters vibratory screening apparatus 13 by funnel panel turnover device 12 and carries out screening operation, and screen overflow enters ore deposit groove 14, and screen underflow enters transhipment belt 19 by belt or funnel (not shown) and returns sintering and use; When not needing recovery to sieve when returning mine, directly entering transhipment belt 19 by funnel panel turnover device 12 and returning sintering use.So return mine and reclaim operation and be interrupted and carry out, if returning mine of certainly reclaiming to use when reaching balance with clock-type blast furnace, vibratory screening apparatus 13 also can be worked continuously.But the present invention is not limited to this, as long as the little grade agglomerate of following component and content can be sieved out, that is, little grade agglomerate comprises the agglomerate that the grade of 45 ~ 55% is the agglomerate of 3 ~ 5mm, the agglomerate of the grade >5mm of 35 ~ 45% and the grade <3mm of 0 ~ 20% by weight percentage.In addition, preferably, little grade agglomerate comprises the agglomerate that the grade of 50% is the agglomerate of 3 ~ 5mm, the agglomerate of the grade >5mm of 40% and the grade <3mm of 10% by weight percentage.
In the technique of charging, the ore containing little grade agglomerate and coke are joined in clock-type blast furnace.
One of clock-type blast-furnace smelting feature is " little batch weight, large load, high strength ", bell-type burden difficulty after batch weight strengthens, opens great bell packing frequency and strengthens, affect blanking direct motion simultaneously, after using little grade agglomerate, because overall permeability index is deteriorated, batch weight can not strengthen, therefore, in one embodiment of the invention, preferably, can the batch weight often criticizing ore be controlled at 20t-25t(more preferably, the batch weight often criticizing ore can be controlled at 20t-21t).In order to promote clock-type smooth operation of furnace, adopt large load to reduce pressure reduction, during cloth, coke load can be controlled in 4.2t/t ~ 5.0t/t(more preferably, and during material, coke load can be controlled in 4.2t/t ~ 4.8t/t).Preferably, the synthetic load 3.2-4.0t/t of clock-type blast furnace, coke combustion intensity maintains 1.0-1.2t/m
3d, integrated smelting intensity 1.4-1.5t/m
3d.
In one embodiment of the invention, after using little grade agglomerate, overall permeability is poor, preferably, the weight of little grade agglomerate accounts for 0.5 ~ 10.0%(of ore gross weight more preferably, and the weight of little grade agglomerate accounts for 0.5 ~ 5.0% of ore gross weight).In order to exemplarily illustrate, returning mine of middle grade >5mm of returning mine under certain factory's ditch accounts for about 20%, because of sieve classification point and screening efficiency problem, that returns mine middle grade >5mm under ditch can only reclaim about 10%, it can not be all the agglomerate of grade >5mm in the little grade agglomerate reclaimed, wherein, also comprise the agglomerate of grade <3mm, but ratio is little.Such as, the little grade agglomerate of recovery comprises by weight percentage: the agglomerate of the grade >5mm of 35-45%, and the grade of 45-55% is the agglomerate of the agglomerate of 5-3mm and the grade <3mm of 0-20%.Can clock-type blast furnace all accept to reclaim little grade agglomerate and smelt, and can determine according to the smelting condition of clock-type blast furnace.Therefore, preferably, the weight of little grade agglomerate accounts for 0.5 ~ 10.0% of ore gross weight is suitable.
According to one embodiment of present invention, distributor can be utilized ore and coke to be poured in little clock 2, to open pressure-equalizing and discharging pipe 6; When the air pressure in great bell 1 and ambient atmosphere pressure balanced, open little clock 2, enter in great bell 1 to make ore and coke; Close pressure-equalizing and discharging pipe 6, open and all press gas pipe 5; When the air pressure in great bell 1 is less than or equal to the air pressure in clock-type blast furnace, open great bell 1, enter in clock-type blast furnace to make ore and coke.
Any suitable distributor can be utilized to carry out cloth to ore and coke.In one embodiment of the invention, preferably, Ma Jishi distributor 3 pairs of ores and coke is utilized to carry out cloth.When utilizing Ma Jishi distributor 3 to carry out cloth, can regulation Ma Jishi distributor 3 be 0 ° at station, elevator side one, the sharp position of its heap is ° place in 180 corresponding thereto; The six station work of 60 ° should be adopted under normal circumstances, should correct in time when actual angle and preselected angle are not inconsistent; In addition, be adjustment gas fluid distrbution, can Iterim Change Ma Jishi distributor angle and station not.
According to one embodiment of present invention, ore also can comprise large grade agglomerate, lump ore and pellet.In charging process, if coke layer and little grade agglomerate layer contact area large, then little grade agglomerate can bleed in coke layer, cause poor air permeability, therefore, allow large grade agglomerate contact with coke when cloth, little grade agglomerate is distributed in above large grade agglomerate as far as possible, then relevant with the loading sequence of ore.Therefore, preferably, the ore bed in clock-type blast furnace is followed successively by large grade sintering ore bed A, lump ore layer B, pelletizing ore bed C and little grade agglomerate layer D from top to bottom.That is, as depicted in figs. 1 and 2, after the little grade agglomerate of acquisition, by this little grade agglomerate by transhipment belt 15.1, 15.2, 15.3 be transported to trestle under store in ore deposit groove 16.4 store, no longer sieve under ditch, at storage ore deposit groove 16.4, a suitable chute (not shown) is set, little grade agglomerate is entered weighing bucket and carries out accurate batch weighing, to on the main belt 18 of the material loading of clock-type blast furnace then, store the pellet stored in ore deposit groove 16.3 under trestle simultaneously, storing the large grade agglomerate stored in ore deposit groove 16.1 under storing the lump ore and trestle stored in ore deposit groove 16.2 under trestle falls on the main belt 18 of material loading successively, operate with the main belt of material loading 18 and above-mentioned material is transported in feeding cart 4 successively.According to the cloth regular of clock-type blast furnace roof, little grade agglomerate D should enter in feeding cart 4 at first, is positioned at the bottom of feeding cart 4, is secondly pellet C, lump ore B and large grade agglomerate A.
After the feeding cart 4 that ore is housed arrives the furnace roof of clock-type blast furnace, ore is poured in hopper, according to feeding cart 4 loading sequence, the order pouring hopper into is just in time contrary, enter in clock-type blast furnace according to the order of large grade agglomerate A, lump ore B, pellet C and little grade agglomerate D successively, like this, efficiently avoid little grade agglomerate layer and contact with the direct of coke layer, decrease the probability of the coke layer that bleeds and affect ventilation property.
It should be noted that, large grade agglomerate of the present invention refers to the agglomerate of grade at 5 ~ 80mm.
The smelting impact of loading sequence on clock-type blast furnace is comparatively large, such as, can adopt with dress, along dress, upside-down mounting or their combination.But the principle of burden distribution system increases the weight of edge, dredging central gas stream is main.
According to the impact of charging system on clock-type blast-furnace smelting, burden distribution system can be divided into three kinds of methods:
First method: complete in filling combination: MA program+NB program+LC program.
Second method: same, packing combination: MA program+NB program+L(W ↓ G ↓) program.
The third method: full packing combination: W ↓ G ↓ program.
In first method, A program is increase the weight of the system at edge in one-period, and B program is the system alleviating edge, and c program is the system that can use heavy slightly edge or heavy slightly center as required.Wherein, M, N, L can adopt suitable ratio according to the change of smelting condition.
In the second approach, owing to being restricted with batch weight during dress, in order to expand batch weight further and improve gas utilization rate, generally a batch of material being left great bell at twice and be distributed in clock-type blast furnace.In addition, A program is increase the weight of the system of edge coal gas in one-period, W and G in packing is also the formal dress increasing the weight of edge, and as W can be OO, G can be OCCC.B program as required, can use the system at heavy slightly edge or heavy slightly center.Wherein, M, N, L according to the change of smelting condition, can adopt the suitable ratio that can combine.
The third method is full packing, can add great batch weight according to the change of smelting condition, improves to reach the object that gas utilize reduces coke ratio.
No matter adopt which kind of method above-mentioned, its final purpose is all will reach Gas Flow reasonably to distribute.In order to improve the metallurgical effect of clock-type blast furnace, comparatively reasonably gas flow distribution is edge coal gas CO
2than height of center 3 ~ 5%, that is, reach and increase the weight of edge, the object at dredging center, be beneficial to enliven cupola well reinforcing blast furnace and smelt.Such as, can 1A+1B+2C(1OCOC+1COCO+2OO ↓ OCCC ↓ be adopted), 1A+1C(1OCOC+1OO ↓ OCCC ↓), 2A+1B+2C(2OCOC+1COCO+2OO ↓ OCCC ↓) and 3A+2C(3OCOC+2OO ↓ OCCC ↓) etc. burden distribution system.But, in one embodiment of the invention, preferably, according to first time open that great bell is distributed into OCOC, second time opens that great bell is distributed into OO, third time open order that great bell is distributed into OCCC carry out circulating burden distribution (1OCOC+1OO ↓ OCCC ↓, that is burden distribution system is 1A+1C), that is, material loading is the system increasing the weight of edge in one-period, re-uses the system at heavy slightly edge or heavy slightly center.In the present invention, it should be noted that, O represents ore, and C represents coke.
The change of stockline on gas fluid distrbution impact significantly, should by the stockline needing selection suitable of the working of a furnace.In non-limiting example, the stockline of clock-type blast furnace roof is no more than 3.0m the most deeply.When there is furnace throat temperature high (particularly oxygen enrichment is not enough, during intensity difference), 100mm stockline can fall temporarily.
In addition, in non-limiting example of the present invention, can according to the change of the needs of the working of a furnace and smelting condition, select suitable batch weight, under normal circumstances, ore deposit should be fixed and criticize constant, provisional weight adjusts variable coke (per) charge, and preferably, provisional weight must not adjust more than 30 batches.
In addition, in non-limiting example of the present invention, owing to being generally contained in the raw material Yi Gunxiang center on great bell 1 upper strata, therefore, when adding the flux such as antiscales or Wingdale in clock-type blast furnace, first can fill ore and refill antiscales or Wingdale, forbid antiscales and Wingdale cloth at clock-type blast furnace edge.
In the technique of air-supply, control blast energy is 150 ~ 230kJ/s, and blast temperature is not less than 1200 DEG C, and air blast oxygen enrichment percentage is not less than 1%.
Because coke nature angle of rest (repose) is lower than the angle of rest (repose) of large grade agglomerate and lump ore, particle segregation.In the process of the roof material distributing of clock-type blast furnace, large grade agglomerate and lump ore are easily distributed in edge, and pellet is easy to Gun Xiang center, and edge load is heavier.Coke nature angle of rest (repose) is little, is easily distributed in the Intermediate Gray at deflection center, piles sharp deflection center, ore storage point Fine fraction of ore is many, and poor air permeability, after large grade agglomerate and little grade agglomerate load in mixture, be easy to during cloth, in the sharp position of heap, namely be partial to center, make central permeable sexual deviation.Therefore, need add and reduce air port area, strengthen blast energy and blow through center, that is, blast energy is controlled at 150 ~ 230kJ/s.In order to exemplarily illustrate, with 1200m
3blast furnace is example, and+a 140mm × 17,18 scenery resource quality Ф 130mm × 1 change+a 140mm × 16, Ф 130mm × 2 or a Ф 130mm × 3+140mm*15 etc. into.Air port area is by 0.275m
2be reduced into 0.273m
2or 0.271m
2, blast energy brings up to 182kJ/s or 232kJ/s by 145kJ/s.Improve blast energy and be conducive to strengthening smelting, blow through center, enliven cupola well.As can be seen from blast energy formula, improve wind-warm syndrome, reduce blast, reduce air port area and all can improve blast energy, more than calculate is reduce air port area when keeping wind-warm syndrome and blast is constant and the kinetic energy that obtains promotes, as calculated, wind-warm syndrome rises 10 DEG C, and blast energy only rises 2kJ/s, and blast reduces 0.01MPa, blast energy only rises 8kJ/s, reduces air port area as seen to raising blast energy especially obviously with responsive.
In the present invention, in order to strengthening smelting, take the measure improving blast temperature and oxygen enrichment percentage, blast temperature is not less than 1180 DEG C (preferably, blast temperature can be controlled in 1180 DEG C ~ 1220 DEG C), air blast oxygen enrichment percentage is not less than 1%(preferably, and air blast oxygen enrichment percentage can be controlled in 1% ~ 3%), thus make the better effects if utilizing little grade agglomerate, can combustion intensity be improved.
Under the high strength of clock-type blast furnace is smelted, the top pressure drop low voltage difference of clock-type blast furnace can be improved, promote burden direct motion, reduce hanging probability, in one embodiment of the invention, preferably, clock-type blast furnace top pressure can be controlled in 0.1-0.12MPa, and high top pressure operation rate reaches 95-100%.By controlling the top pressure of clock-type blast furnace, improve gas utilization rate, after arriving furnace roof, gas temperature must reduce, and top temperature drop low being conducive to protects furnace top equipment.Furnace throat ring week (as 6 thermometrics, 8 thermometrics) uniformity of temperature profile, extreme difference is distributed as 300 DEG C-600 DEG C, average out to about 450 DEG C, and throat temperature extreme difference is 100 DEG C-300 DEG C, average out to about 220 DEG C, this furnace roof ring Zhou Wendu can not cause damage to clock-type blast furnace.In non-limiting example of the present invention, can adopt and open the little clock equalizing valve of front opening at little clock, close after little clock opens about 1/3; Open front opening great bell equalizing valve at great bell, the mode of closing after great bell opens about 1/3 controls the top pressure of clock-type blast furnace.
Therefore, clock-type blast furnace according to the present invention utilizes little grade agglomerate to carry out the method for smelting, and overcomes clock-type blast furnace and little grade agglomerate can not be utilized to carry out the defect of smelting, and by adjusting process parameter, ensure that normal production, improve economic benefit.
In addition, entering blast-furnace smelting by reclaiming the little grade agglomerate in returning mine, decreasing the process cost of screening agglomerate grade.
In addition, by utilizing little grade agglomerate to solve blast furnace materials situation in short supply, raw materials cost is reduced.
Below by specific embodiment, the method that clock-type blast furnace of the present invention utilizes little grade agglomerate to smelt is described.
Embodiment 1:
With 1200m
3clock-type smelting vanadium-titanium magnetite by blast furnace is that example illustrates that clock-type blast furnace utilizes little grade agglomerate to carry out the method for smelting.
The preparation of little grade agglomerate: store the agglomerate stored in ore deposit groove 16.1 under trestle and sinter vibratory screening apparatus 11 sieve under ditch, the agglomerate of >5mm grade to be fallen under ditch on the main belt 18 of material loading, enters into feeding cart 4; After the agglomerate (returning mine) of <5mm grade drops into and transports belt 17, enter into vibratory screening apparatus 13 through funnel panel turnover device 12 and carry out screening operation, the classification point of vibratory screening apparatus 13 is 3.0mm, the agglomerate of middle >3mm grade of returning mine is sifted out, enter ore deposit groove 14 to store, newly-built conveyor 15.1,15.2,15.3 etc. or utilize blast furnace trestle belt the independent ore deposit groove 16.4 be transported under ditch stores by the little grade agglomerate of >3mm, for blast furnace again; Screen underflow <3mm grade return mine by belt lace or flaw (not shown) enter into transhipment belt 19 return sintering use.
Little grade agglomerate is sieved out through aforesaid method, wherein, it be the grade of 45 ~ 55% of little grade agglomerate gross weight is the agglomerate of 3 ~ 5mm that little grade agglomerate comprises weight, the agglomerate of weight to be the agglomerate of the grade >5mm of 35 ~ 45% of little grade agglomerate gross weight and weight the be grade <3mm of 0 ~ 20% of little grade agglomerate gross weight.
Clock-type blast furnace is feeded: after suitable little grade agglomerate obtained above, by transhipment belt 15.1, 15.2, 15.3 be transported to trestle under store in ore deposit groove 16.4 store, no longer carry out sieving under ditch, after weighing, to enter under ditch on the main belt 18 of material loading, then ore deposit groove 16.3 is store, pellet in 16.2, lump ore also enters on main belt 18 successively after weighing, finally that the large grade agglomerate vibratory screening apparatus 11 under ditch store in ore deposit groove 16.1 sieves, under ditch, vibratory screening apparatus 11 classification point is 5mm, the agglomerate (large grade agglomerate) of screen overflow 5-80mm grade enters on the main belt 18 of material loading after weighing, under ditch, the agglomerate (returning mine) of vibratory screening apparatus 11 screen underflow <5mm grade obtains above-mentioned suitable little grade agglomerate through screening.Little grade agglomerate under ditch on the main belt of material loading 18, pellet, lump ore, large grade agglomerate enter in feeding cart 4 along with belt operates successively, in feeding cart 4, from bottom to upper strata, form little grade agglomerate layer D successively, pelletizing ore bed C, lump ore layer B, greatly grade sintering ore bed A(are shown in Fig. 2), the furnace roof to clock-type blast furnace on track 7 is passed through with hawser after charged, start cloth, and be distributed in stove stack layers order antithesis.
On the feeding cart 4 that furnace charge is housed after furnace roof, utilize distributor to be poured in little clock 2 by furnace charge (ore and coke), open pressure-equalizing and discharging pipe 6; When the air pressure in great bell 1 and ambient atmosphere pressure balanced, open little clock 2, enter in great bell 1 to make ore and coke; Close pressure-equalizing and discharging pipe 6, open and all press gas pipe 5; When the air pressure in great bell 1 is less than or equal to the air pressure in clock-type blast furnace, open great bell 1, by burden distribution on the correct position of furnace throat, form charge level and heap point 7.
After opening great bell 1, agglomerate, lump ore, pellet, little grade agglomerate enter in the stove of clock-type blast furnace respectively, the first layer is large grade sintering ore bed and contacting with coke layer, the second layer, third layer, the 4th layer be lump ore layer, pelletizing ore bed, little grade agglomerate layer respectively.Little grade agglomerate is positioned at the superiors, prevents from directly contacting with coke layer and bleeding therebetween, and ventilation property is deteriorated; During next round material loading, coke layer is distributed in above little grade agglomerate layer, better can improve ventilation property.
Between ore and coke according to first time open that great bell is distributed into OCOC, second time opens that great bell is distributed into OO, third time open order that great bell is distributed into OCCC carry out circulating burden distribution (1OCOC ↓+1OO ↓ OCCC ↓, wherein, O represents ore, C represents coke), namely, adopt positive layer charging system, successively by ore and coke totally 4 cars load in great bell, open a great bell and be distributed in stove; Two car ores are opened great bell to be distributed in stove; Packing one car ore and three car coke load in great bell again, open great bell and are distributed in stove, adopt aforesaid way to circulate successively.Take this burden distribution system, can reach in one-period and increase the weight of edge, re-use the object at heavy slightly edge or heavy slightly center, the center coal gas of making suitably develops, and suppresses edge coal gas overdevelopment.
Clock-type blast furnace after charging is blown.
Processing parameter and the metallurgical effect of this process are as shown in table 1.
Embodiment 2:
This technical process with embodiment 1, processing parameter and metallurgical effect as shown in table 1.
Comparative example (base period):
This technical process with embodiment 1, processing parameter and metallurgical effect as shown in table 1.
Table 1 clock-type blast furnace uses effect comparison before and after little grade agglomerate
As can be seen from Table 1,1200m
3in the process of clock-type smelting vanadium-titanium magnetite by blast furnace, after use 1.43% and 2.68% little grade agglomerate (accounting for burden structure ratio), main economic and technical indices is not only deteriorated, but also maintain the smelting of high loading high strength, working of a furnace stable smooth operation, achieve utilization coefficient to improve, the net effect that fuel ratio declines.
In addition, and little grade agglomerate usage quantity every day reaches more than 150t, saves process cost 100 yuan calculating, a 1200m by using the little grade agglomerate of 1t
3clock-type blast furnace can reduce resource expense more than 5,000,000 yuan every year; Therefore, solve the problem of clock-type blast furnace part materials resource scarcity, decrease the cost into purchasing other high price ore, overall economic efficiency is remarkable.
In addition, by utilizing little grade agglomerate to solve blast furnace materials situation in short supply, raw materials cost is reduced.
More than describe the preferred embodiment of the present invention in detail; but; the present invention is not limited to the detail in above-mentioned embodiment; within the scope of technical conceive of the present invention; can carry out multiple simple variant and combination to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
Claims (9)
1. clock-type blast furnace utilizes little grade agglomerate to carry out a method of smelting, and described method comprises the steps:
Charging: the ore containing little grade agglomerate and coke are joined in clock-type blast furnace;
Air-supply: control blast energy is 150 ~ 230kJ/s, and blast temperature is not less than 1180 DEG C, and air blast oxygen enrichment percentage is not less than 1%;
Wherein, little grade agglomerate comprises the agglomerate that the grade of 45 ~ 55% is the agglomerate of 3 ~ 5mm, the agglomerate of the grade >5mm of 35 ~ 45% and the grade <3mm of 0 ~ 20% by weight percentage.
2. method according to claim 1, wherein, based on the gross weight of ore, the weight of described little grade agglomerate is 0.5 ~ 10.0%.
3. method according to claim 1, wherein, described ore also comprises large grade agglomerate, lump ore and pellet, and when joining in clock-type blast furnace, ore bed is followed successively by large grade sintering ore bed, lump ore layer, pelletizing ore bed and little grade agglomerate layer from top to bottom.
4. method according to claim 1, wherein, the batch weight often criticizing ore is 20t ~ 25t, and to control coke load be 4.2t/t ~ 5.0t/t.
5. method according to claim 1, wherein, when carrying out cloth to ore and coke, according to first time open that great bell is distributed into OCOC, second time opens that great bell is distributed into OO, third time opens the order that great bell is distributed into OCCC and carry out circulating burden distribution; O represents ore, and C represents coke.
6. method according to claim 1, wherein, in the step of charging, utilizes distributor ore and coke to be poured in little clock, opens pressure-equalizing and discharging pipe; When the air pressure in great bell and ambient atmosphere pressure balanced, open little clock, enter in great bell to make ore and coke; Close pressure-equalizing and discharging pipe, open and all press gas pipe; When the air pressure in great bell is less than or equal to the air pressure in clock-type blast furnace, open great bell, enter in clock-type blast furnace to make ore and coke.
7. method according to claim 1, wherein, utilizes Ma Jishi distributor to carry out cloth to ore and coke.
8. method according to claim 1, wherein, described method also comprises: the furnace top pressure controlling clock-type blast furnace is 0.10 ~ 0.15MPa, and high top pressure operation rate is not less than 95%.
9. method according to claim 1, wherein, coke combustion intensity is 1.0 ~ 1.2t/m
3d, integrated smelting intensity is 1.4 ~ 1.5t/m
3d.
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| JP4317505B2 (en) * | 2004-09-06 | 2009-08-19 | 新日本製鐵株式会社 | Raw material charging method for bell-type blast furnace |
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