CN102228866B - Compound classification method and equipment for ground ore product - Google Patents
Compound classification method and equipment for ground ore product Download PDFInfo
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Abstract
The invention relates to a compound classification method and equipment for a ground ore product, belonging to the technical field of ore processing. The compound classification method is characterized by combining vibration screening with spiral classification methods and comprising the following steps of: firstly carrying out vibration screening on the ground ore product with a double-layer chute vibrating screen to obtain a plus sieve material and a minus sieve material, then directly conveying the plus sieve material to a spiral classifier for classification, returning the coarse material to an ore grinding machine for grinding again, overflowing and discharging the fine material from both sides of the classifier, mixing with the minus sieve material and conveying to subsequent sorting operation, wherein the chute vibrating screen is arranged beside the spiral classifier, the end of the ore discharge chute of the chute vibrating screen is directly connected with the ore feeding port on the tank body of the spiral classifier, and the classification region tank body of the spiral classifier is higher than conventional tank body. The compound classification method and equipment have the advantages of significantly reducing the derichment of fine-grained heavy ore in settled sand and returned sand, low closed-circuit ore grinding over-grinding and inclusion in settled sand, high classification efficiency, achieving direct closed-circuit with the ore grinding machine and the like, and can be used for transforming existing ground ore classification equipment and manufacturing novel screening-spiral compound classifiers supporting the use of the ore grinding machine.
Description
Technical field
The present invention relates to a kind of rapidly and efficiently composite ratings method and apparatus of ore milling product large or fine granule, belong to technical field of mineral processing.
Background technology
Ore grinding is the important process link in ore dressing plant, and the size distribution of ore milling product is very large on the impact of follow-up sorting operation.The product that ore grinding is discharged is the ore pulp form, particle size range is wide, generally can not directly enter sorting operation, needs supporting classifying equipoment to carry out classification to large or fine granule, coarse fraction returns to ore mill and regrinds, and fine fraction enters follow-up secondary grinding and regrinds or directly enter sorting operation.Classifying equipoment current and that ore mill is supporting mainly contains three kinds, and a kind of is spiral classifier, and a kind of is cyclone, and a kind of is screening machine.Spiral classifier is the longest traditional classifying equipoment of Applicative time, rely on the graded region of mine-discharging terminal to carry out the gravitational settling classification, its outstanding advantage is to operate steadily reliably, convenient operating maintenance, the sand return automatic lifting turns back to ore mill and forms closed circuit grinding, without other auxiliary equipment.The disadvantage of spiral classifier is that overflow is easily run slightly, and the sand return folder is thin serious, causes sizing of equipment efficiency low, and classification matter efficiency is only generally 20-40%.Simultaneously, fine-grained heavy minerals sinks to after grinding machine is returned in sand return and easily formed pulverizing, affects follow-up sorting index.Above-mentioned defect due to spiral classifier, replaced by cyclone gradually in mammoth mill in recent years.Centrifugal force field and the poor gravitational field of grain density granularity that cyclone relies on the ore pulp High Rotation Speed to produce carry out classification, and its outstanding advantage is that classification efficiency is high, and classification matter efficiency can reach 60-70%, and equipment volume is little in addition, and configuration is convenient.Also there are several obvious shortcomings in cyclone, and the one, energy consumption is high, and ore pulp must be sent into pump or high-order pulp tank pressure; The 2nd, wearing and tearing are large, give the wearing and tearing of ore deposit mouth and sand settling mouth especially serious; The 3rd, easy obstruction, operation inconvenience, give the necessary prescreening of ore pulp every slag, otherwise coarse granule ore or broken steel ball can cause sand settling mouth to stop up after entering, the cleaning difficulty.Simultaneously, the classification principle of cyclone can not be avoided the derichment phenomenon of sand setting, and namely heavy suite preferentially enters sand setting, returns to the grinding machine rear pulverizing that easily caused of regrinding, to follow-up sort unfavorable.Screening machine also can be used as the supporting classifying equipoment of ore mill and uses, its maximum advantage is that material carries out classification by the physical dimension of sieve aperture, the fine fraction heavy mineral preferentially passes sieve mouthful, can effectively avoid the heavy mineral of spiral classifier and cyclone to return enrichment phenomenon, reduce the mistake crushing phenomenon of ore mill, graded product to follow-up sort favourable.Screening machine is implemented to dither, also can obtain high screening efficiency, screening matter efficiency can reach more than 70%.But when screening machine and ore mill supported the use separately, the ore grinding ore pulp must promote with pump, and energy consumption is higher.In addition, the ore mill treating capacity in medium-and-large-sized ore dressing plant is larger, the separate unit screening machine can not be processed, there is the difficult problem of configuration in many screening machines, and the 3rd, screening machine is under heavy load, screen cloth easily stops up, and serious wear, be difficult to the screening effect that remains stable, therefore the application of screening machine and ore mill closed circuit grinding seldom.
In order to improve the classification efficiency of spiral classifier, all carried out a large amount of work both at home and abroad.What have transform spiral classifier as the classification of multistage circular cone, a plurality of overflow product of output (new-model spiral classifier, ZL96241462.X), what have adds hang plate increase classification area at graded region, avoid overflow to run thick (oblique-plate spiral grader, ZL98245016.8), have spiral sand return mine-discharging terminal add drum sieve improve screening efficiency (composite cylindrical sieve screw grader, ZL99230913.1).These corrective measures are all having certain effect improving aspect the screw classifying engine efficiency, but still have some problems in view of aspects such as device structure and operation stabilities, and the said equipment fails to be applied widely.
Summary of the invention
The object of the invention is to overcome the deficiency of prior art, a kind of composite ratings method and device of ore milling product are provided, integrated chute vibratory sieve and two-side discharging agitating type screw classifying method and apparatus, control the overflow discharge height of spiral classifier, ore milling product is carried out to composite ratings, reduce the derichment of fine fraction heavy mineral.
Ore milling product composite ratings method of the present invention is: the vibrosieve method is combined with the screw classifying method, ore milling product is carried out to composite ratings, at first at the double-deck chute vibratory sieve of the ore discharge chute region division of ore mill, lower floor's compass screen surface is soaked in the screw classifying overflowing liquid, by double-deck screen shale shaker, ore milling product is carried out to vibrosieve, obtain on-the-sieve material and be mixed in the undersize material in the screw classifying overflowing liquid, then on-the-sieve material is directly sent into to spiral classifier and carry out screw classifying, coarse sand is sunk to be carried to the ore deposit end to ore mill by helical blade behind bottom, gravity flow enters ore mill and regrinds, simultaneously, fine particle stage material is stirred again discharges from the overflow of classification case both sides after dispersion, after with undersize material, merging, send into follow-up sorting operation.Horizontal overflow ore discharge pipe by being located at spiral classifier graded region casing both sides and be positioned at the overflow feeder under it, overflow ore pulp to screw classifying is collected, and then send into follow-up sorting operation after with undersize material, merging, the high 300-600mm(of the more common spiral classifier of graded region casing of the spiral classifier used according to actual needs selected in to service), with the granularity of assurance overflow ore pulp.
The equipment that ore milling product composite ratings method of the present invention is used is: it is comprised of chute vibrating screen classifier and spiral classifier, the chute vibrating screen classifier is in the lateral location of spiral classifier, and the tail end of its ore discharge chute 11 directly accesses the feed port on screw classifying box body 12.The chute vibrating screen classifier comprises screen box support 3 and dress screen box 2 thereon, screen frame 4 by spring supporting on screen box, be loaded on the vibrator 5 at screen frame top, be loaded on upper strata wide-meshed screen 7 and lower floor's fine screen mesh 8 of screen frame middle and lower part, be loaded on the undersize material collecting box 9 of screen box bottom, be loaded on ore discharge pipe and flow control valve 10 under the sieve of collecting box bottom, what be loaded on the screen frame front portion gives ore deposit chute 1, and the ore discharge chute 11 that is loaded on screen frame afterbody direct access spiral classifier feed port, screen frame 4 is connected and seals by flexible materials such as rubber with giving between ore deposit chute 1 and ore discharge chute 11.The screen-aperture of wide-meshed screen is that the screen-aperture of 1～10mm, fine screen mesh is 0.1～0.5mm, adopt sieve plate or the screen cloth of polyurethane, abrasive rubber or stainless steel, after upper and lower two-layer screen cloth tensioning, be fastened on screen frame by modes such as press strip and bolt, screws, the vibration frequency of vibrator is 960～3000 times per minute (selected in being given service according to actual needs).
Spiral classifier is common two-side discharging agitating type screw classifying, high 300～the 600mm(of the more conventional spiral classifier of the height of its stepped zone casing is selected in give service according to actual needs), on 2～5 circles (selected according to actual needs) helical blade 14 of stepped zone near chute vibrating screen classifier ore discharge chute tail end, (welding or screw are fixed) 2～10 stirring vane 15(quantity being housed determines according to actual needs), it is that 20～80mm(quantity and size are determined according to actual needs that casing 12 is equipped with respectively (welding or screw are fixed) 2～5 diameters near both sides, vibrating screen classifier mine-discharging terminal position) overflow drain tube 16, it is that 5～10%(determines according to actual needs that (welding or screw fix) gradient is equipped with in the overflow drain tube bottom) overflow feeder 17.Stirring vane 15 on helical blade 14, can improve the classification efficiency of spiral classifier, after being stirred, fine particle stage material bottom making to be submerged in is in suspended state, by the ore discharge pipeline that is arranged on both sides, discharge with shortest path, the overflow as classification after merging with undersize enters subsequent job.
During work, ore milling product is drained in the upper strata screen cloth 7 of chute vibratory sieve screen frame 2 by chute 1, under the vibration of vibrator 5, screen frame 2 is made approximate straight line motion, lump ore and coarse fraction foreign material become the oversize of upper sieve 7, the undersize of upper sieve 7 is in the interior further screening of lower screen 8, the compass screen surface integral body of lower screen 8 is immersed in ore pulp, therefore belonging under liquid, the screening of lower screen 8 sieves, under the effect of vibrator 5, on-the-sieve material is upwards thrown forward rear fully loose, fine fraction, particularly the heavy mineral fine particle stage material passes screen cloth fast under the effect of gravity and fluid drag force becomes undersize (flow of undersize and concentration are regulated by underflow control valve 10), under the effect of screening machine, most of particulate qualified products are drained by undersize material collecting box 9 and discharge tube.Coarse fraction material and unsifted fine particle stage material on sieve, by ore discharge chute 11, be drained in the casing 12 of spiral classifier, rely on the further classification of gravitational settling (secondary grading), sink to bottom and by helical blade 14, carry to the ore deposit end to ore mill afterwards, gravity flow enters ore mill and regrinds.Helical blade 14 is in rotation process, under the effect of stirring vane 15, after being mixed in part fine particle stage material in coarse-grained material and being stirred and again disperseing, under the effect of rising liquid stream, discharge with shortest path from the overflow drain tube 16 of classification case two sides, remittance is in overflow feeder 17, and screening machine undersize and the merging of classifier overflow product are as the ore deposit of giving of subsequent job.Due to screening machine and the whole UNICOM of spiral classifier, liquid level in screening machine is regulated by position and the undersize material control valve 10 of classifier overflow pipe 16, thereby lower floor's screening of guaranteeing screening machine is carried out under liquid, vibration by screen cloth makes ore pulp form strong vibration wave, screen cloth is formed to lasting automatic cleaning, reduce and avoid obstruction and the wearing and tearing of screen cloth, and be arranged on the ore discharge channel of screenings collecting box, ore pulp is produced to suction force, make fine fraction can pass through fast screen cloth, thereby guarantee that the chute vibratory sieve obtains high screening efficiency.Integrated by chute vibratory sieve and two-side discharging agitating type screw grader, innovated the stage division of ore milling product, reaches the composite ratings purpose, reduces the derichment phenomenon of fine fraction heavy mineral.
The present invention adopts composite ratings method and corresponding equipment, can realize following good effect:
(1) utilize the prescreening of chute vibratory sieve, make ore milling product most of fine fraction, particularly the heavy mineral fine fraction is separated in time, significantly reduce the conventional helical grader and with the cyclone gravitational settling, separate the derichment phenomenon of ubiquitous heavy mineral fine fraction in sand setting or sand return with centrifugal sedimentation, reduce crossing of closed circuit grinding and pulverize, the graded product of better choosing is provided for follow-up sorting operation;
(2) utilize and be arranged on the stirring vane on the spiral classifier helical blade, spiral classifier gravitational settling classification process is strengthened, the fine fraction be mixed in coarse fraction is separated again, thereby the folder reduced in sand setting is thin, significantly improves classification efficiency;
(3) utilize the Position Control classification liquid level of the overflow discharge pipeline that is arranged on the grader both sides, the one, the race that can reduce overflow is thick, the 2nd, can the controlling water kick liquid level on the screening machine lower screen, dusting cover is carried out under liquid level, thereby form the automatic cleaning to compass screen surface, significantly reduce obstruction and the wearing and tearing of screen cloth, guarantee that screening machine obtains high and stable screening efficiency;
(4) adopt the inventive method and equipment to carry out composite ratings to ore milling product, the classification matter efficiency of integral device can reach more than 70%, the sand setting derichment reduces more than 70%, the degradation rate of crossing of ore mill reduces more than 30%, the disposal ability of ore mill improves more than 20%, and the rate of recovery of follow-up sorting operation improves 2-5 percentage point;
(5) advantage of spiral classifier has obtained giving full play to, and can realize directly closed circuit with ore mill promoting ore pulp without lifting means such as sand pumps;
(6) this method and equipment both can be used for the transformation of existing grinding system classifying equipoment, also can be used for making new screening spiral composite ratings machine and ore mill and supported the use.
The accompanying drawing explanation
Fig. 1 is composite ratings device front elevational schematic of the present invention;
Fig. 2 is composite ratings device schematic side view of the present invention;
Fig. 3 is composite ratings device schematic top plan view of the present invention.
In figure, 1-ore discharge chute and give the ore deposit chute, the screen box of 2-chute vibratory sieve, the support of 3-vibratory sieve; The screen frame of 4-vibratory sieve, the vibrator of 5-vibratory sieve, the support spring of 6-vibration screen frame, the upper strata sieve plate of 7-vibratory sieve, the lower screen of 8-vibratory sieve, material collection case under the 9-Vibration Screen, discharge of materials pipe and control valve under the 10-Vibration Screen, discharge of materials chute on the 11-Vibration Screen, the casing of 12-spiral classifier, the power transmission shaft of 13-spiral classifier, the helical blade of 14-spiral classifier, the stirring vane of 15-spiral classifier, the overflow drain tube of 16-spiral classifier, the overflow feeder of 17-spiral classifier.
The specific embodiment
Below in conjunction with drawings and Examples, content of the present invention is further elaborated, but content of the present invention is not limited to described scope.
Embodiment 1:Process the tin ore ore dressing plant of 120 tons of ores one day, use single-spiral classifier and ￠ 1500 * 3000 ore mills of ￠ 1200 to carry out closed circuit grinding classification, mog accounts for 75% for-200 orders, the actual measurement spiral classifier is 38% by the classification matter efficiency that 0.074mm calculates, the degradation rate (10 μ m) excessively of Grading Overflow is 32%, and follow-up sorting operation index is undesirable.With method and apparatus of the present invention, hierarchy system is transformed.
The ore milling product composite ratings method adopted is: the vibrosieve method is combined with the screw classifying method, ore milling product is carried out to composite ratings, at first at the double-deck chute vibratory sieve of the ore discharge chute region division of ore mill, lower floor's compass screen surface is soaked in the screw classifying overflowing liquid, by double-deck screen shale shaker, ore milling product is carried out to vibrosieve, obtain on-the-sieve material and be mixed in the undersize material in the screw classifying overflowing liquid, then on-the-sieve material is directly sent into to spiral classifier and carry out screw classifying, coarse sand is sunk to be carried to the ore deposit end to ore mill by helical blade behind bottom, gravity flow enters ore mill and regrinds, simultaneously, fine particle stage material is stirred again discharges from the overflow of classification case both sides after dispersion, after with undersize material, merging, send into follow-up sorting operation.Horizontal overflow ore discharge pipe by being located at spiral classifier graded region casing both sides and be positioned at the overflow feeder under it, overflow ore pulp to screw classifying is collected, and then send into follow-up sorting operation after with undersize material, merging, the high 400mm of the more common spiral classifier of graded region casing of the spiral classifier used, to guarantee the granularity of overflow ore pulp.
The equipment used is comprised of chute vibrating screen classifier and spiral classifier, and the chute vibrating screen classifier is in the lateral location of spiral classifier, and the tail end of its ore discharge chute directly accesses the feed port on the screw classifying box body.That is, the angle of original grader is brought up to 15
0, outwards translation 800mm, set up chute vibrating screen device of the present invention between ore mill and grader.The chute vibration screening device comprises screen box support 3 and dress screen box 2 thereon, screen frame 4 by spring supporting on screen box, be loaded on the vibrator 5 at screen frame top, be loaded on upper strata wide-meshed screen 7 and lower floor's fine screen mesh 8 of screen frame middle and lower part, be loaded on the undersize material collecting box 9 of screen box bottom, be loaded on ore discharge pipe and flow control valve 10 under the sieve of collecting box bottom, what be loaded on the screen frame front portion gives ore deposit chute 1, and the ore discharge chute 11 that is loaded on screen frame afterbody direct access spiral classifier feed port, screen frame 4 is connected and seals by elastomeric material with giving between ore deposit chute 1 and ore discharge chute 11.High 800 * 600 * 800mm that is of a size of of the length and width of vibratory sieve, it is the polyurethane sieve plate of 1mm that upper sieve adopts aperture, it is the abrasion-proof stainless steel screen cloth of 0.1mm that lower screen adopts aperture, after upper and lower two-layer screen cloth tensioning, uses press strip and screw fastening on screen frame, and the vibration frequency of vibrator is 3000 times/minutes.
Spiral classifier is common two-side discharging agitating type screw classifying, the high 400mm of the more conventional spiral classifier of the height of its stepped zone casing, on stepped zone each blade near 5 circle helical blades 14 of chute vibrating screen classifier ore discharge chute tail end, be welded with the generous stirring vane 15 that is of a size of 120 * 60 * 12mm of 4 block lengths, casing 12 respectively is welded with near both sides, vibrating screen classifier mine-discharging terminal position the overflow drain tube 16 that 3 diameters are 40mm, and it is 8% overflow feeder 17 that the overflow drain tube bottom is welded with width 150mm, the gradient.Stirring vane 15 on helical blade 14 can improve the classification efficiency of spiral classifier, after being stirred, fine particle stage material bottom making to be submerged in is in suspended state, then by the ore discharge pipeline that is arranged on both sides, discharge with shortest path, the overflow as classification after merging with undersize enters subsequent job.
After by method and apparatus of the present invention, this hierarchy system having been transformed, continuous post-installation review and the index test of 3 months have been carried out, equipment has reached 63% by the classification matter efficiency of 0.074mm classification, the grain size content that is less than 10um in overflow is reduced to 19% by 32%, crosses degradation rate and reduces by 41%.After classification efficiency improved, the disposal ability of ore mill improved 25%, and the daily handling ability in ore dressing plant reaches 150t/d.After the degradation rate reduction was crossed in overflow, the tin rate of recovery of sorting operation improved 3.8 percentage points.
Embodiment 2:Process the copper ore dressing factory of 1500 tons of ores one day, in the primary grinding operation, use duplex-spiral classifier and ￠ 2700 * 3600 ore mills of ￠ 2000 to carry out closed circuit grinding classification, the ore discharge granularity is 0.3mm, mog accounts for 60% for-200 orders, the actual measurement spiral classifier is 50% by the matter efficiency of 0.3mm classification, the classification matter efficiency of calculating by 0.074mm is 32%, and the degradation rate (10 μ m) excessively of Grading Overflow is 26%.
With the inventive method and equipment, hierarchy system is transformed, the method and apparatus used is with embodiment 1.That is, the angle of original grader is brought up to 15
0Outside translation 1000mm, between ore mill and grader, set up chute vibratory sieve of the present invention, high 1200 * 800 * 1000mm that is of a size of of the length and width of vibratory sieve, it is the polyurethane sieve plate of 5mm that the upper sieve of vibratory sieve adopts aperture, it is the abrasion-proof stainless steel screen cloth of 0.35mm that lower floor adopts aperture, after upper and lower two-layer screen cloth tensioning, uses press strip and bolted on screen frame, and the vibration frequency of vibrator is 1480 times/minutes.The ore discharge chute of vibratory sieve oversize directly is linked into the material inlet of spiral classifier, the casing of spiral classifier graded region is increased 600mm, at two side along continuous straight runs of casing, respectively be screwed the overflow ore discharge pipe of 5 diameter 20mm, under it, be screwed the overflow feeder of width 200mm, the gradient 10%.Graded region 2 the circle helical blades each blade on be screwed the generous stirring vane that is of a size of 180 * 80 * 16mm of 10 block lengths.The undersize material of vibratory sieve and the overflow of grader merging enter the second segment ore grinding, and grader sand return automatic lifting turns back to ore mill and regrinds.
After by method and apparatus of the present invention, this hierarchy system having been transformed, continuous post-installation review and the index test of 3 months have been carried out, equipment reaches 73% by the classification matter efficiency that 0.3mm calculates, the classification matter efficiency of calculating by 0.074mm has reached 68%, the grain size content that is less than 10um in overflow is reduced to 18% by 26%, crosses degradation rate and reduces by 31%.After classification efficiency improved, the disposal ability of ore mill improved 20%, and the daily handling ability in ore dressing plant reaches 1800t/d.After the degradation rate reduction was crossed in overflow, the copper recovery of sorting operation improved 2.6 percentage points.
Embodiment 3:Process the iron ore beneficiating factory of 1000 tons of ores one day, in the primary grinding operation, use SLFS1500 screening spiral composite ratings machine of the present invention and ￠ 2100 * 3000 ore mills to carry out closed circuit grinding classification, the ore discharge granularity is 0.4mm, mog accounts for 55% for-200 orders, and concrete grammar and device are with embodiment 1.
High 1000 * 750 * 900mm that is of a size of of length and width of screening spiral composite ratings machine chute vibratory sieve, it is the polyurethane sieve plate of 6mm that the upper sieve of vibratory sieve adopts aperture, it is the abrasion-proof stainless steel screen cloth of 0.45mm that lower floor adopts aperture, and the vibration frequency of vibrator is 1480 times/minutes.The ore discharge chute of vibratory sieve oversize and the material inlet of spiral classifier flexibly connect by elastomeric material.Spiral classifier is ￠ 1500 double helixs, and the high 400mm of the more conventional spiral classifier of the casing of its graded region is welded with the overflow ore discharge pipe of 4 diameter 50mm at two side along continuous straight runs of casing, at the overflow feeder of its lower weld width 200mm, the gradient 8%.The welding 6 block lengths generous stirring vane that is of a size of 150 * 60 * 14mm on each blade of 3 circle helical blades of graded region mine-discharging terminal.The undersize material of vibratory sieve and the overflow of grader merging enter the second segment ore grinding, and grader sand return automatic lifting turns back to ore mill and regrinds.
After by method and apparatus of the present invention, this hierarchy system having been transformed, continuous post-installation review and index test through 3 months, the screening spiral classifier reaches 75% by the classification matter efficiency that 0.4mm calculates, the classification matter efficiency of calculating by 0.074mm has reached 71%, sieving the grain size content that is less than 10um in lower and overflow product is 16%, has reached the result of use of expection.
Embodiment 4:Certain copper ore dressing factory, in the primary grinding operation, use duplex-spiral classifier and ￠ 2700 * 3600 ore mills of ￠ 2000 to carry out closed circuit grinding classification, the ore discharge granularity is 0.3mm, mog accounts for 60% for-200 orders, the actual measurement spiral classifier is 50% by the matter efficiency of 0.3mm classification, the classification matter efficiency of calculating by 0.074mm is 32%, and the degradation rate (10 μ m) excessively of Grading Overflow is 26%, and the stage division used and device are identical with embodiment 1.
High 1000 * 750 * 900mm that is of a size of of length and width of screening spiral composite ratings machine chute vibratory sieve, it is the abrasive rubber expanded metals of 10mm that the upper sieve of vibratory sieve adopts aperture, it is the wear-resisting polyurethane screen cloth of 0.5mm that lower floor adopts aperture, and the vibration frequency of vibrator is 960 times/minutes.The ore discharge chute of vibratory sieve oversize and the material inlet of spiral classifier flexibly connect by elastomeric material.Spiral classifier is ￠ 1500 double helixs, and the high 300mm of the more conventional spiral classifier of the casing of its graded region is welded with the overflow ore discharge pipe of 2 diameter 80mm at two side along continuous straight runs of casing, at the overflow feeder of its lower weld width 200mm, the gradient 5%.The welding 2 block lengths generous stirring vane that is of a size of 150 * 60 * 14mm on each blade of 4 circle helical blades of graded region mine-discharging terminal.The undersize material of vibratory sieve and the overflow of grader merging enter the second segment ore grinding, and grader sand return automatic lifting turns back to ore mill and regrinds.
Claims (7)
1. ore milling product composite ratings method, it is characterized in that: the vibrosieve method is combined with the screw classifying method, ore milling product is carried out to composite ratings, at first at the double-deck chute vibratory sieve of the ore discharge chute region division of ore mill, lower floor's compass screen surface is soaked in the screw classifying overflowing liquid, by double-deck screen shale shaker, ore milling product is carried out to vibrosieve, obtain on-the-sieve material and be mixed in the undersize material in the screw classifying overflowing liquid, then on-the-sieve material is directly sent into to spiral classifier and carry out screw classifying, coarse sand is sunk to be carried to the ore deposit end to ore mill by helical blade behind bottom, gravity flow enters ore mill and regrinds, simultaneously, fine particle stage material is stirred again discharges from the overflow of classification case both sides after dispersion, after with undersize material, merging, send into follow-up sorting operation.
2. ore milling product composite ratings method according to claim 1, it is characterized in that: the horizontal overflow ore discharge pipe by being located at spiral classifier graded region casing both sides and be positioned at the overflow feeder under it, overflow to screw classifying is collected, then itself and undersize material are merged, send into again follow-up sorting operation, the high 300～600mm of the more common spiral classifier of graded region casing of the spiral classifier used.
3. one kind be used to implementing the claims the ore milling product composite ratings equipment of 1 ore milling product composite ratings method, it is characterized in that: it is comprised of chute vibrating screen classifier and spiral classifier, the chute vibrating screen classifier is in the lateral location of spiral classifier, the tail end of its ore discharge chute (11) directly accesses the feed port on screw classifying box body (12), and the box height of spiral classifier stepped zone is higher than the box height of conventional spiral classifier.
4. according to claim 3 be used to implementing the claims the ore milling product composite ratings equipment of 1 ore milling product composite ratings method, it is characterized in that: the chute vibrating screen classifier is by screen box support (3) and dress screen box (2) thereon, screen frame by spring supporting on screen box (4), be loaded on the vibrator (5) at screen frame top, be loaded on upper strata wide-meshed screen (7) and lower floor's fine screen mesh (8) of screen frame middle and lower part, be loaded on the undersize material collecting box (9) of screen box bottom, be loaded on ore discharge pipe and flow control valve (10) under the sieve of collecting box bottom, what be loaded on the screen frame front portion gives ore deposit chute (1), and the ore discharge chute (11) that is loaded on screen frame afterbody direct access spiral classifier feed port forms, spiral classifier is common two-side discharging agitating type screw grader, on its helical blade (14) near the stepped zone of chute vibrating screen classifier ore discharge chute tail end, polylith stirring vane (15) is housed, casing (12) is equipped with respectively overflow drain tube (16) near the both sides of mine-discharging terminal position, overflow feeder (17) is equipped with in the overflow drain tube bottom, screen frame (4) is connected and seals by flexible material with giving between ore deposit chute (1) and ore discharge chute (11).
5. described be used to implementing the claims the ore milling product composite ratings equipment of 1 ore milling product composite ratings method according to claim 3 or 4, it is characterized in that: the high 300～600mm of the more conventional spiral classifier of height of spiral classifier stepped zone casing.
6. according to claim 4 be used to implementing the claims the ore milling product composite ratings equipment of 1 ore milling product composite ratings method, it is characterized in that: the screen-aperture of wide-meshed screen is that the screen-aperture of 1～10mm, fine screen mesh is 0.1～0.5mm, and the vibration frequency of vibrator is 960～3000 times per minute.
7. according to claim 4 be used to implementing the claims the ore milling product composite ratings equipment of 1 ore milling product composite ratings method, it is characterized in that: the helical blade that stirring vane is installed is 2～5 circle helical blades near ore discharge chute tail end stepped zone, the stirring vane quantity of installing on each helical blade is 2～10, overflow drain tube (16) quantity that is arranged on each side of casing (12) is that 2～5, diameter are 20～80mm, and the gradient of overflow feeder (17) is 5～10%.
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| CN103433204B (en) * | 2013-08-15 | 2015-07-08 | 中国科学院东北地理与农业生态研究所 | Fresh soil sample size fraction sorting device and fresh soil sample size fraction screening method adopting same |
| CN106391298A (en) * | 2016-09-20 | 2017-02-15 | 昆明理工大学 | Closed circuit ore grinding classification method |
| CN106238444B (en) * | 2016-09-26 | 2017-05-31 | 深圳申佳原环保科技有限公司 | The system of industrial treatment mud dregs |
| CN107983638A (en) * | 2017-12-01 | 2018-05-04 | 无锡市恒达矿山机械有限公司 | A kind of boiler fired coal crush after screening plant |
| CN108745640B (en) * | 2018-06-14 | 2024-01-09 | 中国地质科学院郑州矿产综合利用研究所 | Gradient magnetic gravity centrifugal screening chute, equipment and method for magnetic minerals |
| CN111715419B (en) * | 2020-07-20 | 2024-04-05 | 安徽理工大学 | Combined type grading sedimentation device |
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