CN101492767B - Multi-stage whole-granule processing method and equipment for direct reduction of greenball - Google Patents
Multi-stage whole-granule processing method and equipment for direct reduction of greenball Download PDFInfo
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- CN101492767B CN101492767B CN2008100043533A CN200810004353A CN101492767B CN 101492767 B CN101492767 B CN 101492767B CN 2008100043533 A CN2008100043533 A CN 2008100043533A CN 200810004353 A CN200810004353 A CN 200810004353A CN 101492767 B CN101492767 B CN 101492767B
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Abstract
A multi-stage granular finishing technique directly reducing green ball block is applicable for raw material preparation of coal-based direct-reduction process in metallurgy of iron and steel. The technique is applicable for direct reduction of rotary hearth furnace and that of shaft furnace. Coarse granular material and small granular powder material produced in manufacturing process of raw material are screened out by a multi-stage dispersing screen before entering a reducing furnace. The screened powder material is returned to a storage hopper before the ball block is formed or more pervious mixing section according to moisture content thereof. The powder material is completely recycled. Powder material is screened out, thus being beneficial to radiation of hearth feeding of the rotary hearth furnace and heat of transfer by convection and smelting of reducing furnace; and air permeability of the shaft furnace is improved and nodule of the shaft furnace is reduced. The invention is beneficial to reducing dust emission, reducing pollution of dust to the air, improving yield of metal, reducing cost and increasing output of production.
Description
Technical field
The present invention relates to the raw material preparation method of a kind of ferrous metallurgy industry direct-reduction process and adopt the equipment of this method, be specially adapted to the preparation of the compound cold fixed ball piece of furnace charge-iron charcoal of coal-based direct reduction method or the cold fixed ball piece of breeze etc.
Background technology
At present, both at home and abroad be that to adopt oxide pellet and cold fixed ball piece mostly be furnace charge for the direct-reduced iron factory of raw material with the iron ore concentrate, and the subject matter that the coal-based direct reduction iron technology of the cold fixed furnace charge of this application exists is: many particles are at first arranged before reduction and very easily produce reduction degradation in reduction process, some powders enter flue gas system, increase the dust removal installation load, cause severe contamination; Secondly general coal base reduction feed stock for blast furnace, no matter be to adopt balling disc manually to make pelletizing, or adopting pair roller high pressure nodulizer to carry out artificial ball piece is shaped, its product is all directly sent into reduction furnace, or only establish the single-deck screen powder, do not make special granularity multi-stage whole-granule going into the stokehold, cause the excessive ball piece reduction of granularity not saturating, degree of metalization is low; The 3rd is owing to the homogeneity of ball piece granularity is not controlled, make undersized pellet and the material powder directly enters reduction furnace and in stove dense accumulation, reduced the radiation and the transmission of heat by convection of the bed of material, cause caking, burning, influence production efficiency.Therefore, ball piece granularity is excessive or too small, all the productivity of the high recovery rate of iron that guarantees expection and reduction furnace is existed the influence of significant adverse, also causes severe energy waste and environmental pollution simultaneously.
According to the coal-based direct reduction iron technology as can be known, the density of ball piece self and intensity count for much for the thermostability and the reductibility of ball piece nodulizing.The density of ball piece and intensity are high more, and its thermostability and reductibility are good more, help smelting process more.Therefore, stop low density, low intensive ball piece enters reduction furnace, improve the density between the ball piece and the homogeneity of intensity, for improve smelting process, improve degree of metalization, reduce the mineral aggregate loss and energy consumption very important.Yet under existing ball piece forming technology condition, owing to be subjected to all multifactor impacts such as ball piece compacting pressure, pressuring method, the time of exerting pressure, pressing speed and material moisture, the density between the ball piece after the ball piece forming process and the difference of intensity are very big.Under existing craft condition, owing to be subjected to all multifactor impacts such as health mode, health environment, conditioned time, bigger change also can take place in the intensity between the ball piece after the health operation.Therefore, only rely on ball piece forming technology and craft to control density between the ball piece and the homogeneity of intensity is very difficult, that is to say, no matter the ball piece which kind of existing ball piece shaping and health technology are produced, wherein there is the undesirable ball piece of a certain amount of density and intensity inevitably, and how to differentiate and to reject these underproof ball pieces with simple method, control and improve the density of the ball piece enter reduction furnace and the homogeneity of intensity is one of difficult problem in the current coal base reduction iron technology.Find according to the inventor, owing to can not effectively reject defective ball piece, both made the powder that before the input reduction furnace, sieves, but still have a large amount of ball pieces in adding the reduction furnace process because of being hit and pushing fragmentation, form the pellet or the powder of undersized, the ball piece that also has has just lost intensity under low-temperature condition.The method of a kind of rejecting low density of expecting easily and low strength ball piece is the operation by detecting, but obviously, this method is not have Practical significance, because ball lump ore material usage quantity is big, so it is impracticable in scale operation, and technology cost costliness, detection efficiency is extremely low.
In sum, in the coal-based compound ball of existing direct reduction furnace (as rotary hearth furnace, shaft furnace) reduction is produced, because the defective ball piece that produces in the process early stage is handled, make the pellet of the excessive piece material of granularity, undersized and powder and density and the low excessively ball piece of intensity enter reduction furnace, soot emissions are serious, contaminate environment serious, it is serious to waste energy thereby cause, simultaneously also to guaranteeing that recovery rate of iron reaches desired value and produces totally unfavorable influence.
Summary of the invention
At above-mentioned existing in prior technology defective, the invention provides a kind of multi-stage whole-granule processing method of direct reduction green ball block and the equipment of this method of employing, adopt the whole grain of multi-stage screening mode, improve the homogeneity of size, density and intensity between the ball piece, pellet and the low excessively ball piece of powder, density and intensity of thoroughly stopping the excessive piece material of granularity, undersized enter reduction furnace.Go into the stokehold at green ball block, it is means that this method is disperseed screening with multiple spot, by frequency and the amplitude that slide sieve and moto-vibro screen match and adjust the ball piece height of fall, mechanical vibration, makes the automatic fragmentation of the low excessively ball piece of density and intensity and is screened out superseded.By repeatedly sieving whole grain, granularity is screened out greater than the piece material of 30mm with less than small-particle pellet and the powder of 3mm, the green ball block granularity of guaranteeing to import reduction furnace is 3～30mm, the recycling of leading portion operation is sent in the returning charge that screens out out back to.
The technical scheme that the present invention solves green ball block multi-stage whole-granule processing method that its technical problem adopts and equipment thereof is as follows:
Directly the multi-stage whole-granule processing method of reduction green ball block adopts the mode of multi-stage whole-granule and dispersion treatment, the granularity that produces in the ball piece production process is surpassed the mistake bulk material, granularity of 30mm mistake small pellets and the too small ball piece of powder, density and intensity less than 3mm, before going into reduction furnace, screened out by the whole grain of multi-stage screening, the qualified ball piece of the diameter that filters out between 3～30mm enters back step operation, and the operation that the front is returned in the underproof returning charge that screens out out reshapes utilization; The mode of described multi-stage whole-granule and dispersion treatment is meant the whole grain of screening operation is interted to go between the operations at different levels of stokehold in ball piece shaping back and ball piece by the level dispersion; Frequency, the amplitude of the mechanical vibration by height that suitable ball piece falls and screening plant are set in the whole grain of screenings at different levels operation, the ball piece is experienced a shock and push, make the too small ball piece of density and intensity under this impact and extruding, be broken into too small pellet and powder automatically, and screen out, thereby improved the homogeneity of size, density and intensity between the ball piece of going into stove.
Described multi-stage whole-granule and dispersion treatment comprise the steps: by being arranged on the be shaped bilayer screening of the whole grain of first step screening before back and the health of ball piece of ball piece, screen out appear the bulk material and cross small pellets, powder returns the operation before being shaped, the qualified ball piece that filters out send health, baking operation; By being arranged on the individual layer screening of the whole grain of second stage screening behind the health of ball piece, the baking operation, screen out out the operation before too small pellet and powder return batch mixing, the qualified ball piece that sifts out gives next transhipment operation; By being arranged on the individual layer screening of the whole grain of third stage screening before the reduction furnace, screen out out the operation before too small pellet and powder return batch mixing again, the qualified ball piece that filters out is directly sent into cloth in the reduction furnace.
The described mistake bulk material that screens out out is meant that granularity surpasses the ball piece of 30mm, can not wait by whole the mistake small pellets that screens out out of every grade of screening and the granulometry of powder, the granularity that screens out of back one-level sieve should be less than the granularity that screens out of previous stage sieve, finally is going in the stove furnace charge of providing of reduction furnace less than the particle of 3mm less than 5% of total stuff amount to control; Described qualified ball piece is meant the ball piece of diameter at 3mm to 30mm.
Adopt the multi-stage whole-granule treatment facility of multi-stage whole-granule processing method of the present invention, comprise mixer, ball piece forming mill, ball piece health preserving equipment, ball piece transporter, reduction furnace and furnace charge material distributing machine, also comprise the whole grain of multi-stage screening equipment, be used to screen out the bulk material, cross small pellets and the too small ball piece of powder, density and intensity.
The whole grain of described multi-stage screening equipment is as the three grades of whole grain of screening equipment; After the whole grain of first step screening equipment is arranged on ball piece forming mill, be a double deck screen or two single-deck screens, be used to handle ball piece by ball piece forming mill output, wherein the first layer sieve is used to screen out excessive ball piece, second layer sieve is used to screen out small pellets and powder, send down the step operation with the qualified ball piece that filters out; After the whole grain of second stage screening equipment is arranged on ball piece health preserving equipment, be single-deck screen, be used for screening out mistake small pellets and powder, send down the step operation the qualified ball piece that filters out by the ball piece of health preserving equipment output; Before the whole grain of third stage screening equipment is arranged on reduction furnace, be single-deck screen, be used to screen out too small pellet and powder, the qualified ball piece that filters out is directly sent into reduction furnace; The operation that underproof block of material, pellet and the powder that the whole grain of screenings at different levels equipment filters out returns the front by the transporter utilization that is shaped again.
The whole grain of described screening equipment is slide sieve or moto-vibro screen; The sieve aperture that is arranged on the whole grain of the screening equipment can be set diameter according to the granularity requirements of screening ball piece, removes by mesh screen and appears the bulk material, crosses small pellets and powder, filters out accept; The whole grain of described screening equipment falls into the structural arrangement of sieve according to pending ball piece, and the height H that the ball piece is fallen is adjustable, by adjusting height H, makes the low excessively ball piece of density and intensity be broken into too small pellet or powder automatically and is screened out; The gradient of described slide sieve can roll down mode automatically according to pending ball piece and set on sieve, roll to utilize ball piece deadweight gravity flow, and the ball piece is experienced a shock and push, thereby the low excessively ball piece of the density of making and intensity is broken into too small pellet or powder automatically and is screened out; The amplitude of the vibration of described moto-vibro screen and frequency are set according to the requirement of pending ball piece motion on sieve, the ball piece is experienced a shock in vibration and push, and make the low excessively ball piece of density and intensity be broken into too small pellet or powder automatically and screened out.
The whole grain of first step screening equipment is slide sieve, and the second stage and the whole grain of third stage screening equipment are moto-vibro screen; Described slide sieve is provided with the gradient of 28 to 45 degree.
The diameter of the sieve aperture of the first layer sieve of the whole grain of first step screening equipment is 30mm, goes up and is screened out so that granularity is stayed sieve greater than the mistake bulk material of 30mm; The diameter of the sieve aperture of the second layer sieve of the whole grain of first step screening equipment is 8mm, so that granularity is leaked to sieve less than the mistakes small pellets of 8mm and powder and screened out, the granularity that the first step is sieved qualified ball piece is 8mm to 30mm; The diameter of the sieve aperture of the whole grain of second stage screening equipment is 5mm, so that granularity is extremely sieved down and screened out less than mistake small pellets and the powder leakage of 5mm, the granularity of qualified ball piece is 5mm to 30mm; The diameter of the sieve aperture of the whole grain of third stage screening equipment is 3mm, so that granularity is extremely sieved down and screened out less than mistake small pellets and the powder leakage of 3mm, the granularity of qualified ball piece is 3mm to 30mm.
The diameter of the sieve aperture of the second layer sieve of the whole grain of first step screening equipment, second stage screening whole grain equipment and the whole grain of third stage screening equipment also can be 3mm, so that granularity less than the mistake small pellets of 3mm and powder leak to sieve down and screened out, guarantee finally to go in the furnace charge of reduction furnace less than the pellet of 3mm and powder less than 5% of total amount.
Experiment showed, that the present invention by simple, efficient economy, the minimum method of investment, has realized the effect that productivity significantly improves, can reduce smoke discharge amount more than 60%, improve the metal earning rate more than 5%, the output that increases reduction furnace is more than 10%.
Description of drawings
Fig. 1 is the process flow sheet of the embodiment of green ball block multi-stage whole-granule processing method of the present invention.
Fig. 2 a, b, c are the structural representations of the three grades of whole grain of screening apparatus embodiments of the present invention, and wherein, Fig. 2 a represents double deck screen, and Fig. 2 b, 2c represent the situation of single-deck screen.
Fig. 3 is that the ball piece of the whole grain of multi-stage screening of the present invention equipment falls into the synoptic diagram of the embodiment of sieve structure.
Embodiment
Specific embodiment below in conjunction with shown in the accompanying drawing 1 to 3 describes green ball block multi-stage whole-granule processing method of the present invention and equipment thereof in detail, and method of the present invention and equipment thereof are not limited to the embodiment of following explanation.
The multi-stage whole-granule processing method of direct reduction green ball block of the present invention, adopt the principle of multi-stage whole-granule and dispersion treatment, with the mistake bulk material and mistake small pellets, powder that produces in the raw material production process, before going into reduction furnace, it is screened out, the returning charge that screens out out is returned the feed bin before the ball piece is shaped according to self moisture condition, or returns the workshop section before the batch mixing, all recovery is used for making again ball, and guaranteeing finally provides high-quality piece material for reduction furnace.
Shown in Figure 1 is the process flow sheet of the embodiment of green ball block multi-stage whole-granule processing method of the present invention, and this embodiment is the method for three grades of whole grains.
Three grades of whole-granule processing methods of green ball block of the present invention as shown in Figure 1, will sieve that whole grain operation disperses to intert after ball piece forming process, behind ball piece health/baking operation, go into reduction furnace and directly reduce before the operation.Be arranged on whole of the preceding first step screening of ball piece shaping back and the health of ball piece, screen out out greater than the piece material of 30mm with less than pellet and the powder of 8mm by the double deck screen branch, the returning charge that screens out out turns back to ball piece forming process and is shaped again, and the ball piece of the 8-30mm that filters out enters health/baking operation.Be arranged on the whole grain of second stage screening behind ball piece health/baking operation, screen out out pellet and powder by the single-deck screen branch less than 5mm, the returning charge that screens out out turns back to before the compounding process and reenters compounding process, and the ball piece of the 5-30mm that filters out enters the transhipment operation.Be arranged on to face and directly reduce the whole grain of third stage screening before the operation into stove, screen out out pellet and powder by the single-deck screen branch less than 3mm, the returning charge that screens out out turns back to before the compounding process and reenters compounding process, and the 3-30mm that filters out is qualified, and the ball piece directly enters the reduction furnace smelting procedure.In the three grades of whole grain of screening operations of present embodiment, the whole grain of each grade screening can be by the height of fall, the mode of motion of ball piece on sieve of setting the ball piece, the ball piece is withstood shocks and push,, make the low excessively ball piece of density and intensity broken automatically and screened out by this impact and extruding.
That shown in Figure 1 is the embodiment of three grades of screening whole-granule processing methods of multi-stage whole-granule processing method of the present invention, the progression of the whole grain of screening of the present invention can require plus-minus according to whole grain, whole grain requires highly more then need increase progression more, and whole grain requires low can reduce progression.The whole grain of multi-stage screening operation can disperse to intert each inter process between ball piece forming process and reduction furnace smelting procedure.
That shown in Figure 1 is the embodiment of three grades of screening whole-granule processing methods of multi-stage whole-granule processing method of the present invention, the granulometry of its qualified ball pieces that filter out at different levels is different, the qualified ball piece that the whole grain of first step screening filters out is 8-30mm, the qualified ball piece that screening whole grain in the second stage filters out is 5-30mm, and the qualified ball piece that the whole grain of third stage screening filters out is 3-30mm.The technical scheme of alternative embodiment shown in Figure 1 is that the granulometry of the qualified ball piece that the whole grain of screenings at different levels is filtered out is identical, is 3-30mm.But because the ball piece sieves littler and littler, whole returning charge that is screened out out is many so the shortcoming of this technical scheme is follow-up screening, just sieves the weak effect of whole grain, and its advantage is that the sieve of the whole grain of screenings at different levels can be general.The granulometry of the qualified ball piece that the whole grain of screenings at different levels is filtered out can carry out preferred disposition with effect according to the actual requirements, is not limited to the parameter and standard that technical scheme provided of embodiment shown in Figure 1.
Fig. 2 a, b, c are three grades of structural representations that sieve the embodiment of whole grain equipment of the whole grain of multi-stage screening of the present invention equipment.The equipment of the of the present invention three grade screening whole-granule processing methods of employing shown in Fig. 2 a, b, c, comprise the whole grain of the first step sieve powder equipment (shown in Fig. 2 a) that is positioned at behind the ball piece forming mill, be used to screen out the bulk material and cross small pellets and powder as returning charge, make ball again before sending ball piece forming mill back to.After second stage screening whole grain equipment (shown in Fig. 2 b) is arranged on the health operation, be used for the whole grain of second stage screening behind health of health stockyard or dryer, screen out the mistake small pellets and the powder that produce in health and the drying course, batch mixing workshop section batch mixing is again returned in the returning charge that screens out out.The whole grain of third stage screening equipment (shown in Fig. 2 c), be arranged on the material distributing machine of facing reduction furnace before, be used for new a mistakes small pellets and a Powder screen that the transportation transport process produces are removed, the returning charge that screens out out returns to batch mixing workshop section, reuses after adding the water mixing.
The whole grain of first step screening equipment shown in Fig. 2 a is located at the exit of ball piece forming mill, and described ball piece forming mill can be a balling disc 1, or pair roller ball press 2 (seeing shown in Figure 3).The whole grain of first step screening equipment is a two-layer equation slide sieve 31, and the gradient is 28～45 degree, allows the finished ball piece roll down by the deadweight gravity flow.The diameter of the sieve aperture 311 of the first layer sieve of described double-deck slide sieve 31 is 30mm, and the piece material of granularity 〉=30mm can not be leaked down on sieve, and the piece material of granularity＜30mm is leaked to second layer sieve, and general 〉=30mm piece material screen removes simultaneously.The diameter of the sieve aperture 312 of the second layer sieve of described double-deck slide sieve 31 is 8mm, by sieve aperture 312, make from the piece material of the granularity＜30mm of the first layer sieve＜pellet of 8mm and powder leaks down and screened out, the granularity of not leaking down be 8-30mm close piece ball piece, give next step operation.The piece material of the granularity 〉=30mm that is screened out out by double-deck slide sieve 31 and pellet, the powder of granularity＜8mm are returned in the buffering hopper before the ball piece is shaped, owing to kept the freshness of returning charge and the tightness that has improved, so can improve intensity, the density of the balling ratio and the green ball block of the ball piece that is shaped once more.The technical scheme of the embodiment of a double-deck slide sieve 31 shown in alternative Fig. 2 a is two individual layer slide sieves.First individual layer slide sieve is used to screen out 〉=the mistake bulk of 30mm, filter out simultaneously＜the piece material of 30mm delivers to second single-deck screen through transhipment and handles; Second single-deck screen be used to screen out＜mistake small pellets and the powder of 8mm, and the qualified ball piece that filters out 8-30mm simultaneously send and goes on foot operation.The difference of two individual layer slide sieves and a double-deck slide sieve is, two individual layer slide sieves can realize that not only the elder generation of the foregoing description removes greatly, little screening procedure is removed in the back, but also can realize removing big screening procedure except that little, back earlier, be first individual layer make＜pellet of 8mm and powder leak down and screened out from sieve aperture, on the sieve 〉=the piece material of 8mm continues by second single-deck screen of deadweight (or passing on) inflow, by second single-deck screen make 〉=the piece material of 30mm screened out, the qualified ball piece that makes 8-30mm leaks down and delivers to down the step operation from sieve aperture.
Shown in Fig. 2 b, the whole grain of second stage screening equipment is an individual layer slide sieve 32, and the diameter of its sieve aperture 321 is 5mm, be arranged on health, baking operation after.By slide sieve 32, make at the mistakes small pellets of oven dry, granularity＜5mm of producing in the health operation and powder from sieve aperture 321, to leak down and screened out, the qualified ball piece of the granularity 5-30mm that filters out is delivered to down and is gone on foot operation.Because mistake small pellets and the powder that screen out this moment dry out, therefore should return Preblend system PBS, new and old material is mixed together behind the interpolation moisture, uses so that the ball piece is shaped to reclaim.The whole grain of second stage screening equipment not only can adopt the individual layer slide sieve, but also can adopt the moto-vibro screen (not shown).
Shown in Fig. 2 c, the whole grain of third stage screening equipment is an individual layer slide sieve 33, and the diameter of its sieve aperture 331 is 3mm, is arranged on before the material distributing machine of reduction furnace, after sifting out health or oven dry, be sent to new too small pellet and the powder that produces in the reduction furnace process, guarantee the clean stove of expecting to go into.By slide sieve 33, make the mistake small pellets of granularity＜3mm and powder leak down and screened out from sieve aperture 331, the qualified ball piece of the 3-30mm that filters out directly send material distributing machine to be distributed into reduction furnace, screen out out＜returning charge of 3mm returns Preblend system PBS, be mixed together with virgin material after adding moisture, use so that the ball piece is shaped to reclaim.The whole grain of third stage screening equipment also can adopt moto-vibro screen.
Can learn that from the embodiment shown in Fig. 2 a, b, the c principle of controlling the granulometry of qualified ball piece is to set the diameter of sieve apertures at different levels.Set the diameter of sieve apertures at different levels according to the requirement of the whole grain of screening.
The ball piece of shown in Figure 3 the is whole grain of multi-stage screening of the present invention equipment falls into the embodiment of sieve structure.As seen from Figure 3, slide sieve 3 is gone in ball piece 5 free fallings that are shaped from pair roller ball press 2.Slide sieve 3 can be the double deck screen 31 shown in Fig. 2 a, also can be the single-deck screen shown in Fig. 3.From exporting to of pair roller ball press 2 height H is arranged between the slide sieve 3, the ball piece, will inevitably be impacted and be pushed on 3 from the height H free falling to slide sieve.Slide sieve 3 is provided with gradient α, this gradient α makes ball piece 5 roll by the deadweight gravity flow on sieve, in this rolling process, ball piece 5 also will inevitably be impacted and be pushed, because this impact and extruding, will inevitably make the low excessively piece material of density and intensity be broken into too small pellet or powder automatically and screened out, the higher ball piece of intensity and density screenedly be gone out because of broken, thereby improved the density of qualified ball piece and the homogeneity of intensity.This shows, by adjusting the gradient α of height of fall H and slide sieve, thereby reach the purpose of rejecting the low excessively ball piece of density and intensity.
Embodiment from Fig. 3.At first be the upper end equipment that the ball piece falls into sieve to be set be not limited to pair roller ball press 2, can also be applicable to comprise balling disc, oven dry health machine, the various green ball blocks of machine of passing on prepare equipment.Next is that lower end equipment is not limited to slide sieve, but also can be moto-vibro screen.Described moto-vibro screen (not shown), except comprise with Fig. 2 and slide sieve shown in Figure 3 identical the have sieve of sieve aperture, it also comprises can drive the mechanical actuation device that described sieve is done vibration, by described mechanical actuation device, order about the ball piece and on sieve, do vibration and rolling, by frequency and the amplitude of controlling described vibratory screening apparatus, can reach the suffered impact of control ball piece and the purpose of crushing strength.
The multi-stage whole-granule that the present invention adopts and the method for dispersion treatment, can guarantee comprehensively that high-intensity clean material goes into stove, every grade screens out granularity and goes into the stove granularity all controlled, multistage pellet that screens out and powder can both be according to self-conditions, reclaim the operation that is used for the front respectively, stove＜pellet of 3mm is finally gone in assurance and the ratio that powder accounts for into the stove total stuff amount is no more than 5%, for reduction furnace provides high-quality piece material.
The present invention is applicable to but is not limited to the method and apparatus of the whole grain of multi-stage screening behind pair roller ball press or the balling disc pellet forming process; directly reduce applicable to rotary hearth furnace; help reduction furnace and realize the radiation uniformly transfer heat, prevent salamander, protection discharging mechanical means.The present invention is also applicable to directly whole grain processing of material distributing machine furnace charge before of reduction furnace such as shaft furnaces, guarantee that powder do not go into stove, help the ventilation property of reduction furnace, prevent the dross hanging, also help reducing the dust and help environmental protection of coming out of the stove, improve the productivity of recovery rate of iron and reduction furnace.The present invention can reduce smoke discharge amount more than 60%, improves recovery rate of iron more than 5%, and reduction furnace output increases more than 10%.
Claims (9)
- One kind directly the reduction green ball block multi-stage whole-granule processing method, it is characterized in that:Adopt the mode of multi-stage whole-granule and dispersion treatment, the granularity that produces in the ball piece production process is surpassed the mistake bulk material, granularity of 30mm mistake small pellets and the too small ball piece of powder, density and intensity less than 3mm, before going into reduction furnace, screened out by the whole grain of multi-stage screening, the diameter that filters out enters back step operation at the qualified ball piece of 3mm to 30mm, and the operation that the front is returned in the underproof returning charge that screens out out reshapes utilization;The mode of described multi-stage whole-granule and dispersion treatment is meant the whole grain of screening operation is interted to go between the operations at different levels of stokehold in ball piece shaping back and ball piece by the level dispersion;Frequency, the amplitude of the mechanical vibration by height that suitable ball piece falls and screening plant are set in the whole grain of screenings at different levels operation, the ball piece is experienced a shock and push, make the too small ball piece of density and intensity under this impact and extruding, be broken into too small pellet and powder automatically, and screened out, thereby improved the homogeneity of size, density and intensity between the ball piece of going into stove.
- 2. the multi-stage whole-granule processing method of direct reduction green ball block according to claim 1 is characterized in that described multi-stage whole-granule and dispersion treatment comprise the steps:By be arranged on the be shaped bilayer screening of the whole grain of first step screening before back and the health of ball piece of ball piece, screen out appear the bulk material and cross small pellets, powder returns the operation before being shaped, the qualified ball piece that filters out send health, baking operation;By being arranged on the individual layer screening of the whole grain of second stage screening behind the health of ball piece, the baking operation, screen out out the operation before too small pellet and powder return batch mixing, the qualified ball piece that sifts out gives next transhipment operation;By being arranged on the individual layer screening of the whole grain of third stage screening before the reduction furnace, screen out out the operation before too small pellet and powder return batch mixing again, the qualified ball piece that filters out is directly sent into cloth in the reduction furnace.
- 3. according to the multi-stage whole-granule processing method of the direct reduction green ball block of claim 1 or 2, it is characterized in that:The mistakes small pellets that is screened out out by every grade of whole grain of screening and the granulometry of powder do not wait, and the screening out granularity and should screen out granularity less than what previous stage was sieved of back one-level sieve is going in the stove furnace charge of providing of reduction furnace less than the particle of 3mm less than 5% of total stuff amount to control final.
- 4. adopt the multi-stage whole-granule treatment facility of the described multi-stage whole-granule processing method of claim 1, comprise mixer, ball piece forming mill, ball piece health preserving equipment, ball piece transporter, reduction furnace and furnace charge material distributing machine, it is characterized in that:Also comprise the whole grain of multi-stage screening equipment, be used to screen out mistake bulk material that granularity surpasses 30mm, granularity mistake small pellets and the too small ball piece of powder, density and intensity less than 3mm.
- 5. according to the multi-stage whole-granule treatment facility of claim 4, it is characterized in that:The whole grain of described multi-stage screening equipment is the three grades of whole grain of screening equipment;After the whole grain of first step screening equipment is arranged on ball piece forming mill, be a double deck screen or two single-deck screens, be used to handle ball piece by ball piece forming mill output, wherein the first layer sieve is used to screen out excessive ball piece, second layer sieve is used to screen out small pellets and powder, send down the step operation with the qualified ball piece that filters out;After the whole grain of second stage screening equipment is arranged on ball piece health preserving equipment, be single-deck screen, be used for screening out mistake small pellets and powder, send down the step operation the qualified ball piece that filters out by the ball piece of health preserving equipment output;Before the whole grain of third stage screening equipment is arranged on reduction furnace, be single-deck screen, be used to screen out too small pellet and powder, the qualified ball piece that filters out is directly sent into reduction furnace;The operation that underproof block of material, pellet and the powder that the whole grain of screenings at different levels equipment filters out returns the front by the transporter utilization that is shaped again.
- 6. according to claim 4 or 5 described multi-stage whole-granule treatment facilities, it is characterized in that:The whole grain of described screening equipment is slide sieve or moto-vibro screen;The sieve aperture that is arranged on the whole grain of the screening equipment can be set diameter according to the granularity requirements of screening ball piece, removes by mesh screen and appears the bulk material, crosses small pellets and powder, filters out accept;The whole grain of described screening equipment falls into the structural arrangement of sieve according to pending ball piece, and the height H that the ball piece is fallen is adjustable, by adjusting height H, makes the low excessively ball piece of density and intensity be broken into too small pellet or powder automatically and is screened out;The gradient of described slide sieve can roll down mode automatically according to pending ball piece and set on sieve, roll to utilize ball piece deadweight gravity flow, and the ball piece is experienced a shock and push, thereby the low excessively ball piece of the density of making and intensity is broken into too small pellet or powder automatically and is screened out;The amplitude of the vibration of described moto-vibro screen and frequency are set according to the requirement of pending ball piece motion on sieve, the ball piece is experienced a shock in vibration and push, and make the low excessively ball piece of density and intensity be broken into too small pellet or powder automatically and screened out.
- 7. multi-stage whole-granule treatment facility according to claim 6 is characterized in that:The whole grain of first step screening equipment is slide sieve, and the second stage and the whole grain of third stage screening equipment are moto-vibro screen;Described slide sieve is provided with the gradient of 28 to 45 degree.
- 8. multi-stage whole-granule treatment facility according to claim 5 is characterized in that:The diameter of the sieve aperture of the first layer sieve of the whole grain of first step screening equipment is 30mm, goes up and is screened out so that granularity is stayed sieve greater than the mistake bulk material of 30mm; The diameter of the sieve aperture of the second layer sieve of the whole grain of first step screening equipment is 8mm, so that granularity is leaked to sieve less than the mistakes small pellets of 8mm and powder and screened out, the granularity that the first step is sieved qualified ball piece is 8mm to 30mm;The diameter of the sieve aperture of the whole grain of second stage screening equipment is 5mm, so that granularity is extremely sieved down and screened out less than mistake small pellets and the powder leakage of 5mm, the granularity of qualified ball piece is 5mm to 30mm;The diameter of the sieve aperture of the whole grain of third stage screening equipment is 3mm, so that granularity is extremely sieved down and screened out less than mistake small pellets and the powder leakage of 3mm, the granularity of qualified ball piece is 3mm to 30mm.
- 9. multi-stage whole-granule treatment facility according to claim 5 is characterized in that:The diameter of the sieve aperture of the second layer sieve of the whole grain of first step screening equipment, second stage screening whole grain equipment and the whole grain of third stage screening equipment is 3mm, so that granularity less than the mistake small pellets of 3mm and powder leak to sieve down and screened out, guarantee finally to go in the furnace charge of reduction furnace less than the pellet of 3mm and powder less than 5% of total amount.
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| CN102952938B (en) * | 2011-08-26 | 2014-07-23 | 宝山钢铁股份有限公司 | Method for processing fine ores used for blast furnace smelting by using raw ores |
| CN104016568A (en) * | 2014-05-30 | 2014-09-03 | 台嘉玻璃纤维有限公司 | Glass fiber bagged powder homogenizing system and homogenizing method |
| CN106191435A (en) * | 2016-08-09 | 2016-12-07 | 重庆大学 | A kind of municipal sludge resource utilization method in pellet sintering |
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| CN1635167A (en) * | 2003-12-29 | 2005-07-06 | 安阳钢铁股份有限公司 | Particle shaping process with less breakage, smaller grain and narrower deflection gap for hearth layer material in sinter |
| CN1786217A (en) * | 2005-11-25 | 2006-06-14 | 安阳钢铁集团有限责任公司 | Two stage screening technology of smelting-pelletizing green ball and its screening device |
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| CN1842604A (en) * | 2003-09-23 | 2006-10-04 | 创陞集团有限公司 | Self-reducing, cold-bonded pellets |
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