CN203281437U - Multi-stage air classification system for powdered iron ore - Google Patents
Multi-stage air classification system for powdered iron ore Download PDFInfo
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- CN203281437U CN203281437U CN2013202362760U CN201320236276U CN203281437U CN 203281437 U CN203281437 U CN 203281437U CN 2013202362760 U CN2013202362760 U CN 2013202362760U CN 201320236276 U CN201320236276 U CN 201320236276U CN 203281437 U CN203281437 U CN 203281437U
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Abstract
The utility model provides a multi-stage air classification system for powdered iron ore, which comprises a blower, a first stage vertical air separator, a second stage vertical air separator, a cyclone air separator, a bag-type collector and an exhaust outlet that are all connected sequentially, wherein an air outlet of the blower is communicated with an air inlet of the first stage vertical air separator and an air inlet of the second stage vertical air separator respectively; the bottom ends of the first stage vertical air separator and the second stage 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; an air outlet of the bag-type collector is connected with the exhaust outlet via an exhaust pipe; the bottom end of the bag-type collector is connected with a third stock bin. Through adoption of the multi-stage air classification system, precise classification of powdered iron ore with size fraction of 0-5mm can be realized, powdered iron ore with size fraction of 1-5mm can be separated out efficiently, probability that powdered iron ore with size fraction of 0-1mm enters into a kiln is greatly lowered, and therefore the difficult problem of high probability of ring formation in a rotary kiln can be efficiently solved.
Description
Technical field
The utility model belongs to technical field of mineral processing, relates to the multistage air classification system of a kind of iron ore powder
.
Background technology
The character of China's refractory iron ore is complicated, and 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 present 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.
Find through inventor's long term production and research, 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, because heating is easy to this part the micro-size fraction powder in granular material " outstanding raising " with high-temperature high-speed airflow and 1400～1800 ℃ of combustion flames that fuel combustion produces; 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 subjected to thermal softening or thawing, will extremely be softened or be in molten condition by transient heating so in a single day the fine iron ore particle that part " outstanding raising " is got up touches combustion flame, can not get cooled and solidified if be in the iron ore particle of softening or molten condition 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 reach 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 take gas (flue gas or air) as 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,, with its a kind of method of carrying out grading, has 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 with horizontal air classifier, compares, 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.
The utility model content
The purpose of this utility model is the problem that exists 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.
For this reason, the utility model 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, and the vertical air classifier of one-level is connected the bottom of air classifier and connects respectively and connect the first feed bin by the first material pipe and the material pipe of being connected with secondary; 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 in time discharged.
The utility model is on the basis of mechanical classification result, and the 0-5mm grade iron ore powder that namely obtains take mechanical classification, as initial material, utilizes the cooperation of different pneumatic separators that 0-5mm grade iron ore powder is carried out Accurate Classification.
After selection by winnowing finished, 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.
The beneficial effects of the utility model are:, 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.
Description of drawings
Fig. 1 is structural representation of the present utility model.
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 1 vertical with secondary of the second airduct 11 air classifier 1 vertical with one-level by the first airduct 10 respectively, and the vertical air classifier 1 of one-level is connected the bottom of air classifier 2 and connects the first feed bins 12 by the first material pipe 15 and the material pipe 16 of being connected respectively with secondary; 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 have respectively perpendicular putting and linearly tortuous air channel 104 and 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 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 less than 6% iron ore powder with 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 15-20Kpa, and the solid-gas ratio of control system is 1-3kg/m
3, the wind speed of controlling the air intake vent 103 of the vertical air classifier 1 of one-level is that the wind speed of the air intake vent 203 of 25-30m/s, the vertical air classifier 2 of secondary is that the wind speed of the charging aperture 301 of 20-25m/s, whirlwind air classifier 3 is that the wind speed of the charging aperture 401 of 10-20m/s, cloth bag collector 4 is 2-3m/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 12, 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 the is collected detection of take a sample, the iron ore powder that records the 0-1mm grade accounts for 2-4%, has reached the purpose of the effective 0-1mm of separation grade iron ore powder.
Claims (2)
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 vertical air classifier of one-level is connected the bottom of air classifier and connects the first feed bin by the first material pipe and the material pipe of being connected respectively with secondary; 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, is connected with air exhauster on described exhaust duct.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013202362760U CN203281437U (en) | 2013-05-06 | 2013-05-06 | Multi-stage air classification system for powdered iron ore |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013202362760U CN203281437U (en) | 2013-05-06 | 2013-05-06 | Multi-stage air classification system for powdered iron ore |
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| CN2013202362760U Expired - Fee Related CN203281437U (en) | 2013-05-06 | 2013-05-06 | Multi-stage air classification system for powdered iron ore |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103272711A (en) * | 2013-05-06 | 2013-09-04 | 酒泉钢铁(集团)有限责任公司 | Iron mine powder multi-level air classifying system and method |
| CN105132670A (en) * | 2015-09-15 | 2015-12-09 | 东北大学 | Classifying suspension roasting device for complex refractory iron ore |
-
2013
- 2013-05-06 CN CN2013202362760U patent/CN203281437U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103272711A (en) * | 2013-05-06 | 2013-09-04 | 酒泉钢铁(集团)有限责任公司 | Iron mine powder multi-level air classifying system and method |
| CN103272711B (en) * | 2013-05-06 | 2017-07-28 | 酒泉钢铁(集团)有限责任公司 | A kind of iron ore powder multistage wind hierarchy system and method |
| CN105132670A (en) * | 2015-09-15 | 2015-12-09 | 东北大学 | Classifying suspension roasting device for complex refractory iron ore |
| CN105132670B (en) * | 2015-09-15 | 2017-03-22 | 东北大学 | Classifying suspension roasting device for complex refractory iron ore |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131113 Termination date: 20140506 |