CN103272711A - Iron mine powder multi-level air classifying system and method - Google Patents
Iron mine powder multi-level air classifying system and method Download PDFInfo
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Abstract
The invention relates to an iron mine powder multi-level air classifying system and an iron mine powder multi-level air classifying method using the system to perform the iron mine powder air classification. The classifying system comprises a blower, a first-level vertical air separator, a second-level vertical air separator, a cyclone air separator, a cloth bag collector and an exhaust outlet which are sequentially connected; an air outlet of the blower is respectively communicated with the air inlet of the first-level vertical air separator and the air inlet of the second-level vertical air separator, the bottom ends of the first-level vertical air separator and the second-level vertical air separator are respectively connected with a first stock bin, the bottom end of the cyclone air separator is connected with a second stock bin, and the bottom end of the cloth bag collector is connected with a third stock bin. The precise classification of the iron mine powder granularity in 0-5mm size fraction is realized according to the application of the system and method provided by the invention, by effectively sorting the iron mine powder in 1-5mm size fraction, the chance that the iron mine powder in 0-1mm size fraction enters the kiln is greatly reduced so as to effectively solve the problem that the rotary kiln easily forms a ring.
Description
Technical field
The invention belongs to technical field of mineral processing, relate to the multistage air classification system of a kind of iron ore powder and utilize this system to carry out the method for iron ore powder air classification
.
Background technology
The character complexity of China's refractory iron ore, mineral composition is mainly the weak magnetic minerals such as speculum iron, bloodstone, limonite and siderite.Because difficulty selects weak magnetic mineral after magnetizing roast, the iron mineral in ore will be take strong magnetic mineral as main, and therefore, adopting magnetizing roast-magnetic separation process to process refractory iron ore is effective method the most.The refractory iron ore magnetizing roast equipment of current domestic employing mainly contains shaft furnace and rotary kiln.Shaft furnace mainly is processed into the lump ore that the stove granularity is 15～100mm; Rotary kiln is mainly used to process the iron ore powder that granularity is 0～25mm, and the magnetization quality of rotary kiln baking gained roasted ore and separation index all are better than shaft furnace.But in traditional rotary kiln magnetic roasting process, iron ore powder adopts the wholegrain level to enter kiln, exists the problem of the easy ring formation of rotary kiln, need to often stop kiln and remove ring formation, has affected production efficiency, has restricted rotary kiln promotion and application at home.
Through inventor's long term production and research, find, the kiln that enters of the following fine iron ore particle of 1mm is the main reason that causes ring formation of rotary kiln.When the micro-size fraction iron ore material companion of 0-1mm enters the kiln magnetizing roast, the high-temperature high-speed airflow and 1400～1800 ℃ of combustion flames that due to heating, with fuel combustion, produce are easy to this part the micro-size fraction powder in granular material " outstanding raising "; And because the ore particles specific area of the following particle diameter of 1mm is large, it is many that unit mass absorbs heat, than large-size particles, subparticle more easily is subject to thermal softening or thawing, so part " outstanding raise " once the fine iron ore particle got up touch combustion flame will be by transient heating to softening or in molten condition, if the iron ore particle in softening or molten condition can not get cooled and solidified in the suspension process, will be bonded on the kiln wall of rotary kiln with the airstream in kiln motion, build up and just form ring formation, affect the normal use of rotary kiln.Therefore, the subparticle below 1mm in iron ore powder is removed, and then sent into rotary kiln and carry out roasting, can be reached the purpose that prevents ring formation.So need to a kind ofly can carry out accurate classification to iron ore powder, and be mainly the grading system that 0-1mm grade powder is sorted out.
Tradition grading mode has mechanical classification (mainly referring to mechanical picker) and air classification, and the mechanical classification precision is poor, generally can only carry out classification to the iron ore powder of the above grade of 5mm, is difficult to accomplish the Accurate Classification of the following granularity of 5mm.Air classification is that to take gas (flue gas or air) be the selection by winnowing medium, utilizes its quality of material of different grain size than the difference of surface area and to the fixing different characteristic of sensitivity of wind-force, and a kind of method that it is carried out to grading, have higher sharpness of separation.Existing pneumatic separator type has horizontal sorter (claim not only horizontal air classifier), uprush air classifier (but also claiming vertical air classifier) and whirlwind air classifier, and compares with horizontal air classifier, and the sharpness of separation of vertical air classifier and whirlwind air classifier is higher.But above pneumatic separating device has specific granularity process range, employing all can't be processed the Accurate Classification of this wider particle size range of 0～5mm separately, at present, there is no a kind of comprehensive air classification system that can carry out to the iron ore powder of 0～5mm grade Accurate Classification for directly adopting yet.
Summary of the invention
One of purpose of the present invention is the problem existed for prior art, and a kind of multistage air classification system that can carry out to the iron ore powder of 0-5mm grade Accurate Classification is provided.
Another object of the present invention is to provide a kind of method of utilizing above-mentioned hierarchy system to carry out 0-5mm grade iron ore powder air classification.
For this reason, the present invention adopts following technical scheme:
The multistage air classification system of a kind of iron ore powder, comprise the vertical air classifier of one-level, the vertical air classifier of secondary, whirlwind air classifier, cloth bag collector, the first feed bin, the second feed bin, the 3rd feed bin and exhaust outlet; The vertical air classifier of described one-level, the vertical air classifier of secondary and whirlwind air classifier include charging aperture and discharging opening, and the bottom of the vertical air classifier of described one-level and the vertical air classifier of secondary also is provided with air intake vent, and described cloth bag collector comprises charging aperture and air outlet;
The charging aperture of the vertical air classifier of described one-level is connected with hopper, discharging opening is connected with the charging aperture of the vertical air classifier of secondary, charging aperture one side of the vertical air classifier of one-level is provided with air blast, and the air outlet of described air blast is connected with the air intake vent of the vertical air classifier of secondary with the air intake vent of the vertical air classifier of one-level with the second airduct by the first airduct respectively, the bottom of the vertical air classifier of one-level and the vertical air classifier of secondary connects and is connected the first feed bin by the first material pipe with the second material pipe respectively; The discharging opening of the vertical air classifier of secondary connects the charging aperture of whirlwind air classifier;
The discharging opening of described whirlwind air classifier connects the charging aperture of cloth bag collector, and the bottom of whirlwind air classifier connects the second feed bin; The air outlet of described cloth bag collector connects exhaust outlet by exhaust duct, and the bottom of cloth bag collector connects the 3rd feed bin.
Further, be connected with air exhauster on described exhaust duct.When the selection by winnowing medium in the cloth bag collector can not be discharged fast, can start air exhauster the selection by winnowing medium in the cloth bag collector is discharged in time.
A kind of method of utilizing above-mentioned hierarchy system to carry out 0-5mm grade iron ore powder air classification, to be that 0-5mm, water content are less than 6% iron ore powder and are evenly sent in the vertical air classifier of one-level by the charging aperture of hopper and the vertical air classifier of one-level by granularity, under the effect of air blast wind-force, iron ore powder carries out grading by the vertical air classifier of one-level, the vertical air classifier of secondary, whirlwind air classifier and cloth bag collector successively; The air outlet blast of controlling air blast in classification process is 15-20Kpa, and the solid-gas ratio of control system is 1-3kg/m
3, the wind speed that the wind speed that the wind speed that the wind speed of controlling the vertical air classifier air intake vent of one-level is 25-30m/s, the vertical air classifier air intake vent of secondary is 20-25m/s, whirlwind air classifier charging aperture is 10-20 m/s, cloth bag collector charging aperture is 2-3 m/s; Concrete classification process is as follows:
(1) under the effect of the vertical air classifier selection by winnowing of one-level, the iron ore powder of 2-5mm grade is settled down to one-level vertical air classifier bottom and enters the first feed bin, and the iron ore powder of 0-2mm grade selected introductions matter with the wind enters the vertical air classifier of secondary through the charging aperture of the vertical air classifier of secondary;
(2) under the effect of the vertical air classifier selection by winnowing of secondary, the iron ore powder of 1-2mm grade is settled down to secondary vertical air classifier bottom and enters the first feed bin, and the iron ore powder of 0-1mm grade selected introductions matter with the wind enters the whirlwind air classifier through the charging aperture of whirlwind air classifier;
(3) under the selection by winnowing effect of whirlwind air classifier, the iron ore powder of 0.15-1mm grade is settled down to whirlwind air classifier bottom and enters the second feed bin, and the iron ore powder of 0-0.15mm grade selected introductions matter with the wind enters the cloth bag collector through the charging aperture of cloth bag collector;
(4) when selected introductions matter is with the wind passed through the cloth bag collector, 0-0.15mm the iron ore powder of grade is attached to cloth bag collector bag wall or falls to cloth bag collector bottom, classification after finishing is all shaken off the iron ore powder of 0-0.15mm grade to the 3rd feed bin, and the selection by winnowing medium in the cloth bag collector is discharged by exhaust duct and exhaust outlet.
Further, described selection by winnowing medium is that air or rotary kiln carry out the flue gas of discharging after the iron ore magnetizing roast.When the selection by winnowing medium is flue gas, can realize the rotary kiln exhaust gas utilization on the one hand, can also utilize on the other hand fume afterheat to carry out drying to iron ore powder simultaneously.
" solid-gas ratio of system " described in stage division of the present invention refers to that feeding quantity and the air blast of iron ore powder in the unit interval blast the ratio between intrasystem air quantity.In addition, the inlet velocity of each air classifier depends on that wind regime is blast and the system solid-gas ratio of blower outlet on the one hand, the bore that depends on the other hand the air classifier air channel, the wind speed of the vertical air classifier of one-level air classifier air intake vent vertical with secondary also depends on that the two bloats the distribution of air quantity to blower outlet.
The present invention is on the basis of mechanical classification result, and the 0-5mm grade iron ore powder that the mechanical classification of take obtains is initial material, utilizes the cooperation of different pneumatic separators that 0-5mm grade iron ore powder is carried out to Accurate Classification.
After selection by winnowing finishes, the iron ore powder of 1-5mm grade can directly enter rotary kiln and carry out magnetizing roast; 0.15-1mm the iron ore powder of grade can carry out high intensity magnetic separation after the profit mill, or carries out magnetizing roast after pelletizing; 0-0.15mm the iron ore powder of grade can directly carry out high intensity magnetic separation without ore grinding, or carries out magnetizing roast after pelletizing.
Beneficial effect of the present invention is: by Proper Match and the combination of existing pneumatic separation device, realized the Accurate Classification of 0-5mm grade iron ore powder granularity; By effectively sub-electing the iron ore powder of 1-5mm grade, greatly reduced 0-1mm grade iron ore powder and entered the chance of kiln, thereby efficiently solved the difficult problem of the easy ring formation of rotary kiln, created condition for the production efficiency that improves rotary kiln.
The accompanying drawing explanation
The structural representation that Fig. 1 is the multistage air classification system of iron ore powder of the present invention.
The specific embodiment
As shown in Figure 1, the multistage air classification system of a kind of iron ore powder, comprise the vertical air classifier 1 of one-level, the vertical air classifier 2 of secondary, whirlwind air classifier 3, cloth bag collector 4, the first feed bin 12, the second feed bin 13, the 3rd feed bin 14 and exhaust outlet 6; The vertical air classifier 1 of one-level comprises charging aperture 101, discharging opening 102 and is located at the air intake vent 103 of its bottom; The vertical air classifier 2 of secondary comprises charging aperture 201, discharging opening 202 and is located at the air intake vent 203 of its bottom; Whirlwind air classifier 3 comprises charging aperture 301, discharging opening 302; Cloth bag collector 4 comprises charging aperture 401 and air outlet 402;
The charging aperture 101 of the vertical air classifier 1 of one-level is connected with hopper 9, discharging opening 102 is connected with the charging aperture 201 of the vertical air classifier 2 of secondary, charging aperture 101 1 sides of the vertical air classifier 1 of one-level are provided with air blast 8, and the air outlet 801 of air blast 8 is connected with the air intake vent 203 of air intake vent 103 air classifier 2 vertical with secondary of the second airduct 11 air classifier 1 vertical with one-level by the first airduct 10 respectively, the bottom of the vertical air classifier 1 of one-level and the vertical air classifier 2 of secondary is connected the first feed bin 12 by the first material pipe 15 with the second material pipe 16 respectively; The discharging opening 202 of the vertical air classifier 2 of secondary connects the charging aperture 301 of whirlwind air classifier 3; The discharging opening 302 of whirlwind air classifier 3 connects the charging aperture 401 of cloth bag collector 4, and the bottom of whirlwind air classifier 3 connects the second feed bin 13; The air outlet 402 of cloth bag collector 4 connects exhaust outlet 6 by exhaust duct 5, and the bottom of cloth bag collector 4 connects the 3rd feed bin 14; Also be connected with air exhauster 7 on exhaust duct 5.
Existing ground, the vertical air classifier 1 of one-level air classifier 2 vertical with secondary has respectively perpendicular putting and linearly tortuous 104He air channel, air channel 204,3 of whirlwind air classifiers have perpendicular put and screw on air channel 303.In the present embodiment, the stroke in the air channel 104 of the vertical air classifier 1 of one-level is 7m, the stroke in the air channel 204 of the vertical air classifier 2 of secondary is 5m, and the stroke in the air channel 303 of whirlwind air classifier 3 is 3.5m, and the stroke in each air classifier air channel is the movement travel of iron ore powder in each air classifier.
Utilize above-mentioned hierarchy system to carry out the method for 0-5mm grade iron ore powder air classification, to be that 0-5mm, water content are less than 6% iron ore powder and are evenly sent in the vertical air classifier 1 of one-level by the charging aperture 101 of hopper and the vertical air classifier 1 of one-level by granularity, take air as the selection by winnowing medium, under air blast 8 wind-force effects, iron ore powder carries out grading by the vertical air classifier 1 of one-level, the vertical air classifier 2 of secondary, whirlwind air classifier 3 and cloth bag collector 4 successively; The blast of controlling the air outlet 801 of air blast 8 in classification process is 15Kpa, and the solid-gas ratio of control system is 2kg/m
3, the wind speed of the charging aperture 401 that the wind speed of the charging aperture 301 that the wind speed of the air intake vent 203 that the wind speed of controlling the air intake vent 103 of the vertical air classifier 1 of one-level is 30m/s, the vertical air classifier 2 of secondary is 20m/s, whirlwind air classifier 3 is 15 m/s, cloth bag collector 4 is 3 m/s; Concrete classification process is as follows:
(1) under the vertical air classifier 1 selection by winnowing effect of one-level, the iron ore powder of 2-5mm grade is settled down to one-level vertical air classifier 1 bottom and enters the first feed bin 12, and the iron ore powder of 0-2mm grade selected introductions matter with the wind enters the vertical air classifier 2 of secondary through the charging aperture 201 of the vertical air classifier 2 of secondary;
(2) under the vertical air classifier 2 selection by winnowing effects of secondary, the iron ore powder of 1-2mm grade is settled down to secondary vertical air classifier 2 bottoms and enters the first feed bin, and the iron ore powder of 0-1mm grade selected introductions matter with the wind enters whirlwind air classifier 3 through the charging aperture 301 of whirlwind air classifier 3;
(3) under the selection by winnowing effect of whirlwind air classifier 3,0.15-1mm the iron ore powder of grade is settled down to whirlwind air classifier 3 bottoms and enters the second feed bin 13, the iron ore powder of 0-0.15mm grade selected introductions matter with the wind enters cloth bag collector 4 through the charging aperture 401 of cloth bag collector 4;
(4) when selected introductions matter is with the wind passed through cloth bag collector 4,0-0.15mm the iron ore powder of grade is attached to 4 bags of walls of cloth bag collector or falls to cloth bag collector bottom, classification after finishing is all shaken off the iron ore powder of 0-0.15mm grade to the 3rd feed bin 14, and the selection by winnowing medium in cloth bag collector 4 is discharged by exhaust duct 5 and exhaust outlet 6.
After classification finishes, the iron ore powder that the first feed bin 12 is collected samples detection, and the iron ore powder that records the 0-1mm grade accounts for 3%, has reached the purpose of effective separation 0-1mm grade iron ore powder.
embodiment 2
The multistage air classification system of the present embodiment iron ore powder is with embodiment 1.
The above-mentioned hierarchy system of utilizing of the present embodiment is carried out the method for 0-5mm grade iron ore powder air classification, to be that 0-5mm, water content are less than 6% iron ore powder and are evenly sent in the vertical air classifier 1 of one-level by the charging aperture 101 of hopper and the vertical air classifier 1 of one-level by granularity, take air as the selection by winnowing medium, under air blast 8 wind-force effects, iron ore powder carries out grading by the vertical air classifier 1 of one-level, the vertical air classifier 2 of secondary, whirlwind air classifier 3 and cloth bag collector 4 successively; The blast of controlling the air outlet 801 of air blast 8 in classification process is 18Kpa, and the solid-gas ratio of control system is 1kg/m
3, the wind speed of the charging aperture 401 that the wind speed of the charging aperture 301 that the wind speed of the air intake vent 203 that the wind speed of controlling the air intake vent 103 of the vertical air classifier 1 of one-level is 27m/s, the vertical air classifier 2 of secondary is 25m/s, whirlwind air classifier 3 is 10 m/s, cloth bag collector 4 is 2 m/s; Concrete classification process is with embodiment 1.
After classification finishes, the iron ore powder that the first feed bin 12 is collected samples detection, and the iron ore powder that records the 0-1mm grade accounts for 4%, has reached the purpose of effective separation 0-1mm grade iron ore powder.
The present embodiment iron ore powder granularity air classification system is with embodiment 1.
The above-mentioned hierarchy system of utilizing of the present embodiment is carried out the method for 0-5mm grade iron ore powder granularity air classification, to be that 0-5mm, water content are less than 6% iron ore powder and are evenly sent in the vertical air classifier 1 of one-level by the charging aperture 101 of hopper and the vertical air classifier 1 of one-level by granularity, take the rotary kiln flue gas as the selection by winnowing medium, under air blast 8 wind-force effects, iron ore powder carries out grading by the vertical air classifier 1 of one-level, the vertical air classifier 2 of secondary, whirlwind air classifier 3 and cloth bag collector 4 successively; The blast of controlling the air outlet 801 of air blast 8 in classification process is 20Kpa, and the solid-gas ratio of control system is 3kg/m
3, the wind speed of the charging aperture 401 that the wind speed of the charging aperture 301 that the wind speed of the air intake vent 203 that the wind speed of controlling the air intake vent 103 of the vertical air classifier 1 of one-level is 25m/s, the vertical air classifier 2 of secondary is 23m/s, whirlwind air classifier 3 is 20 m/s, cloth bag collector 4 is 2.5 m/s; Concrete classification process is with embodiment 1.
After classification finishes, the iron ore powder that the first feed bin 12 is collected samples detection, and the iron ore powder that records the 0-1mm grade accounts for 2%, has reached the purpose of effective separation 0-1mm grade iron ore powder.
Claims (4)
1. the multistage air classification system of iron ore powder, is characterized in that, comprises the vertical air classifier of one-level, the vertical air classifier of secondary, whirlwind air classifier, cloth bag collector, the first feed bin, the second feed bin, the 3rd feed bin and exhaust outlet; The vertical air classifier of described one-level, the vertical air classifier of secondary and whirlwind air classifier include charging aperture and discharging opening, and the bottom of the vertical air classifier of described one-level and the vertical air classifier of secondary also is provided with air intake vent, and described cloth bag collector comprises charging aperture and air outlet;
The charging aperture of the vertical air classifier of described one-level is connected with hopper, discharging opening is connected with the charging aperture of the vertical air classifier of secondary, charging aperture one side of the vertical air classifier of one-level is provided with air blast, and the air outlet of described air blast is connected with the air intake vent of the vertical air classifier of secondary with the air intake vent of the vertical air classifier of one-level with the second airduct by the first airduct respectively, and the bottom of the vertical air classifier of one-level and the vertical air classifier of secondary is connected the first feed bin by the first material pipe with the second material pipe respectively; The discharging opening of the vertical air classifier of secondary connects the charging aperture of whirlwind air classifier;
The discharging opening of described whirlwind air classifier connects the charging aperture of cloth bag collector, and the bottom of whirlwind air classifier connects the second feed bin; The air outlet of described cloth bag collector connects exhaust outlet by exhaust duct, and the bottom of cloth bag collector connects the 3rd feed bin.
2. a kind of iron ore powder granularity air classification system according to claim 1 and 2, is characterized in that, on described exhaust duct, is connected with air exhauster.
3. a method of utilizing the multistage air classification system of iron ore powder claimed in claim 1 to carry out 0-5mm grade iron ore powder air classification, it is characterized in that, by granularity, be that 0-5mm, water content are less than 6% iron ore powder and are evenly sent in the vertical air classifier of one-level by the charging aperture of hopper and the vertical air classifier of one-level, under the effect of air blast wind-force, iron ore powder carries out grading by the vertical air classifier of one-level, the vertical air classifier of secondary, whirlwind air classifier and cloth bag collector successively; The air outlet blast of controlling air blast in classification process is 15-20Kpa, and the solid-gas ratio of control system is 1-3kg/m
3, the wind speed that the wind speed that the wind speed that the wind speed of controlling the vertical air classifier air intake vent of one-level is 25-30m/s, the vertical air classifier air intake vent of secondary is 20-25m/s, whirlwind air classifier charging aperture is 10-20 m/s, cloth bag collector charging aperture is 2-3 m/s; Concrete classification process is as follows:
(1) under the effect of the vertical air classifier selection by winnowing of one-level, the iron ore powder of 2-5mm grade is settled down to one-level vertical air classifier bottom and enters the first feed bin, and the iron ore powder of 0-2mm grade selected introductions matter with the wind enters the vertical air classifier of secondary through the charging aperture of the vertical air classifier of secondary;
(2) under the effect of the vertical air classifier selection by winnowing of secondary, the iron ore powder of 1-2mm grade is settled down to secondary vertical air classifier bottom and enters the first feed bin, and the iron ore powder of 0-1mm grade selected introductions matter with the wind enters the whirlwind air classifier through the charging aperture of whirlwind air classifier;
(3) under the selection by winnowing effect of whirlwind air classifier, the iron ore powder of 0.15-1mm grade is settled down to whirlwind air classifier bottom and enters the second feed bin, and the iron ore powder of 0-0.15mm grade selected introductions matter with the wind enters the cloth bag collector through the charging aperture of cloth bag collector;
(4) when selected introductions matter is with the wind passed through the cloth bag collector, 0-0.15mm the iron ore powder of grade is attached to cloth bag collector bag wall or falls to cloth bag collector bottom, classification after finishing is all shaken off the iron ore powder of 0-0.15mm grade to the 3rd feed bin, and the selection by winnowing medium in the cloth bag collector is discharged by exhaust duct and exhaust outlet.
4. the method for 0-5mm grade iron ore powder air classification according to claim 3, is characterized in that, described selection by winnowing medium is that air or rotary kiln carry out the flue gas of discharging after the iron ore magnetizing roast.
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| CN110238059A (en) * | 2019-07-06 | 2019-09-17 | 四川玉塑新材料科技有限公司 | A kind of calcium carbonate powder multiclass classification stage division |
| CN115283262A (en) * | 2022-08-26 | 2022-11-04 | 哈尔滨学院 | Mechanism sand wind selector with hierarchical adjustment function |
| CN115283262B (en) * | 2022-08-26 | 2023-09-01 | 哈尔滨学院 | Mechanism sand wind selector with hierarchical adjustment function |
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