CN103272775B - A kind of air classification of iron core powder particle size system and method - Google Patents
A kind of air classification of iron core powder particle size system and method Download PDFInfo
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Abstract
The invention provides a kind of air classification of iron core powder particle size system and the method utilizing this system to carry out iron ore powder air classification.Air classification system of the present invention includes the air blast being sequentially connected with, horizontal air classifier, vertical air classifier, whirlwind air classifier, cloth bag collector and exhaust outlet, the air outlet of described air blast is connected with horizontal air classifier and vertical air classifier respectively, the bottom of described horizontal air classifier and vertical air classifier connects the first feed bin, the bottom of whirlwind air classifier connects the second feed bin, and the bottom of cloth bag collector connects the 3rd feed bin.The utilization of the present invention achieves the Accurate Classification of 0 5mm grade iron ore powder granularity；By effectively sub-electing the iron ore powder of 1 5mm grade, greatly reduce 0 1mm grade iron ore powder and enter the chance of kiln, thus efficiently solve a difficult problem for the easy ring formation of rotary kiln.
Description
Technical field
The invention belongs to technical field of mineral processing, relate to a kind of air classification of iron core powder particle size system and the method utilizing this system to carry out iron ore powder air classification。
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.Owing to difficulty selects weak magnetic mineral after magnetizing roast, the iron mineral in ore will be based on strong magnetic mineral, and therefore, using magnetizing roast-magnetic separation process to process refractory iron ore is maximally efficient method.The refractory iron ore magnetizing roast equipment of current domestic employing mainly has shaft furnace and rotary kiln.Shaft furnace mainly processes into the lump ore that 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 are all good than shaft furnace.But in tradition rotary kiln magnetic roasting process, iron ore powder uses wholegrain level to enter kiln, the problem that there is the easy ring formation of rotary kiln, need often to stop kiln and remove ring formation, have impact on production efficiency, constrain rotary kiln promotion and application at home.
Finding through inventor's long term production and research, the kiln that enters of the fine iron ore particle of below 1mm is the main reason causing ring formation of rotary kiln.When the micro-size fraction iron ore material of 0-1mm is in company with when entering kiln magnetizing roast, and produced by heating fuel combustion, high-temperature high-speed airflow and 1400～1800 DEG C of combustion flames are easy to this part micro-size fraction powder in granular material " is hanged and raised "；And owing to the ore particles specific surface area of below 1mm particle diameter is big, it is many that unit mass absorbs heat, compared to large-size particles, subparticle is more susceptible to thermal softening or thawing, so the fine iron ore particle that part " outstanding raise " is got up once touches combustion flame and will be heated to soften or be in molten condition by moment, if the iron ore particle being in the state of being softened or melted can not get cooled and solidified in resuspension procedure, will be bonded on the kiln wall of rotary kiln with airstream in kiln motion, build up and be formed for ring formation, affect the normal use of rotary kiln.Therefore, the subparticle of below 1mm in iron ore powder is removed, is then re-fed into rotary kiln and carries out roasting, i.e. can reach the purpose preventing ring formation.So needing one that iron ore powder can carry out accurate classification, and the grading system mainly sorted out by 0-1mm grade powder.
Tradition grading mode has mechanical classification (referring mainly to mechanical picker) and air classification, and mechanical classification precision is poor, typically the iron ore powder of more than 5mm grade can only be carried out classification, it is difficult to accomplish the Accurate Classification of below 5mm granularity.Pneumatic separating is to be selection by winnowing medium with gas (flue gas or air), utilizes the difference of its mass specific area of material of different grain size and the characteristic different to the sensitivity of fixing wind-force, is carried out a kind of method of grading, have higher sharpness of separation.Existing pneumatic separator type has horizontal sorter (also known as horizontal air classifier), uprush air classifier (also known as vertical air classifier) and whirlwind air classifier, and compared with horizontal air classifier, the sharpness of separation of vertical air classifier and whirlwind air classifier is higher.But above pneumatic separating device has specific granularity process range, individually employing all cannot process the Accurate Classification of 0～5mm this wider particle size range, at present, there is no a kind of comprehensive air classification system that the iron ore powder of 0～5mm grade can be carried out Accurate Classification being available for and directly using yet.
Summary of the invention
The problem that an object of the present invention is to exist for prior art, it is provided that a kind of granularity air classification system that the iron ore powder of 0-5mm grade can be carried out Accurate Classification.
Another object of the present invention is to provide a kind of method utilizing above-mentioned hierarchy system that 0-5mm grade iron ore powder is carried out granularity air classification.
To this end, the present invention adopts the following technical scheme that
A kind of air classification of iron core powder particle size system, including horizontal air classifier, vertical air classifier, whirlwind air classifier, cloth bag collector, the first feed bin, the second feed bin, the 3rd feed bin and exhaust outlet；Described horizontal air classifier, vertical air classifier and whirlwind air classifier all include that charging aperture and discharging opening, the charging aperture side of described horizontal air classifier are additionally provided with air intake vent, and described cloth bag collector includes charging aperture and air outlet；
The charging aperture of described horizontal air classifier connects has hopper, discharging opening to be connected with the charging aperture of vertical air classifier, the charging aperture side of horizontal air classifier is provided with air blast, and the described air outlet of air blast connects with the air intake vent level of horizontal air classifier, the bottom of horizontal air classifier connects the first feed bin；
The discharging opening of described vertical air classifier connects the charging aperture of whirlwind air classifier, and the bottom of vertical air classifier connects the first feed bin；The bottom of vertical air classifier is additionally provided with secondary air intake vent, and described secondary air intake vent is connected with the air outlet of air blast by secondary air channel；
The discharging opening of described whirlwind air classifier connects the charging aperture of cloth bag collector, and the bottom of described 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, described horizontal air classifier include level be connected Primary plateaus air classifier and two grades of horizontal air classifiers；The charging aperture of described Primary plateaus air classifier connects hopper, the charging aperture of discharging opening two grades of horizontal air classifiers of connection, the charging aperture side of Primary plateaus air classifier is provided with air intake vent, and the air intake vent of Primary plateaus air classifier connects with the air outlet level of air blast, the bottom of Primary plateaus air classifier connects the first feed bin by the first material pipe；The discharging opening of described two grades of horizontal air classifiers connects the charging aperture of vertical air classifier, and the bottom of two grades of horizontal air classifiers connects the first feed bin by the second material pipe；The bottom of vertical air classifier connects the first feed bin by the 3rd material pipe.
Further, on described exhaust duct, connection has air exhauster.When the selection by winnowing medium in cloth bag collector can not quickly be discharged, air exhauster can be started the selection by winnowing medium in cloth bag collector is discharged in time.
A kind of method utilizing above-mentioned hierarchy system that 0-5mm grade iron ore powder is carried out granularity air classification, be by granularity be 0-5mm, water content less than 6% iron ore powder by the charging aperture horizontal air classifier of uniformly feeding of hopper and horizontal air classifier, under air blast wind-force effect, iron ore powder passes sequentially through horizontal air classifier, vertical air classifier, whirlwind air classifier and cloth bag collector and carries out grading；The air outlet blast controlling air blast in classification process is 15-20Kpa, and the solid-gas ratio of control system is 1-3kg/m3, the air intake vent wind speed of the horizontal air classifier of control is 20-30m/s, the wind speed of vertical air classifier secondary air intake vent is 20-25m/s, the wind speed of whirlwind air classifier charging aperture is 10-20 m/s, the wind speed of cloth bag collector charging aperture is 2-3 m/s；Concrete classification process is as follows:
(1) under horizontal air classifier selection by winnowing effect, the iron ore powder of 3-5mm grade is settled down to bottom horizontal air classifier and enters the first feed bin, and the iron ore powder selected introductions matter the most with the wind of 0-3mm grade enters vertical air classifier through the charging aperture of vertical air classifier；
(2) under vertical air classifier selection by winnowing effect, the iron ore powder of 1-3mm grade is settled down to bottom vertical air classifier and enters the first feed bin, and the iron ore powder selected introductions matter the most with the wind of 0-1mm grade enters 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 bottom whirlwind air classifier and enters the second feed bin, and the iron ore powder selected introductions matter the most with the wind of 0-0.15mm grade enters cloth bag collector through the charging aperture of cloth bag collector；
(4) when selected introductions matter with the wind is by cloth bag collector, the iron ore powder of 0-0.15mm grade is attached to cloth bag collector bag wall or falls to bottom cloth bag collector, the iron ore powder of 0-0.15mm grade is all shaken off to the 3rd feed bin after terminating by classification, and the selection by winnowing medium in cloth bag collector is then discharged by exhaust duct and exhaust outlet.
Further, described selection by winnowing medium be air or rotary kiln carry out iron ore magnetizing roast after the flue gas discharged.When selection by winnowing medium is flue gas, on the one hand can realize rotary kiln exhaust gas and utilize, on the other hand can also utilize fume afterheat that iron ore powder is dried simultaneously.
Ratio between air quantity in the feeding quantity of iron ore powder and air blast blast system in " solid-gas ratio of system " refers to the unit interval described in stage division of the present invention.In addition, on the one hand the inlet velocity of each air classifier depends on the wind regime i.e. blast of blower outlet and system solid-gas ratio, on the other hand depending on the bore in air classifier air channel, the inlet velocity of Primary plateaus air classifier and vertical air classifier then additionally depends on the two distribution that blower outlet bloats air quantity.
The present invention is on the basis of mechanical classification result, and the 0-5mm grade iron ore powder i.e. obtained with mechanical classification, as starting material, utilizes the combination of different pneumatic separator that 0-5mm grade iron ore powder is carried out Accurate Classification.
After selection by winnowing terminates, the iron ore powder of 1-5mm grade can be directly entered rotary kiln and carry out magnetizing roast；The iron ore powder of 0.15-1mm grade can carry out magnetizing roast after carrying out high intensity magnetic separation, or pelletizing after profit mill；The iron ore powder of 0-0.15mm grade then can carry out magnetizing roast after directly carrying out high intensity magnetic separation, or pelletizing without ore grinding.
The beneficial effects of the present invention is: by Proper Match and the combination of existing pneumatic separation device, it is achieved that the Accurate Classification of 0-5mm grade iron ore powder granularity；By effectively sub-electing the iron ore powder of 1-5mm grade, greatly reduce 0-1mm grade iron ore powder and enter the chance of kiln, thus efficiently solve a difficult problem for the easy ring formation of rotary kiln, be that the production efficiency improving rotary kiln creates condition.
Accompanying drawing explanation
Fig. 1 is the structural representation of air classification of iron core powder particle size system of the present invention.
Detailed description of the invention
Embodiment
1
As shown in Figure 1, a kind of air classification of iron core powder particle size system, including air blast 8,1, two grades of horizontal air classifiers 2 of Primary plateaus air classifier, vertical air classifier 3, whirlwind air classifier 4, cloth bag collector the 5, first feed bin the 11, second feed bin the 12, the 3rd feed bin 13 and exhaust outlet 7；Primary plateaus air classifier 1 includes charging aperture 101, discharging opening 102；Two grades of horizontal air classifiers 2 include that charging aperture 201, discharging opening 202, vertical air classifier 3 include charging aperture 301, discharging opening 302；Whirlwind air classifier 4 includes charging aperture 401, discharging opening 402；Cloth bag collector 5 includes charging aperture 501 and air outlet 502；
The charging aperture 101 of Primary plateaus air classifier 1 connects hopper 9, discharging opening 102 connects the charging aperture 201 of two grades of horizontal air classifiers 2, charging aperture 101 side of Primary plateaus air classifier 1 is provided with air intake vent 103, and the air intake vent 103 of Primary plateaus air classifier 1 connects with air outlet 801 level of air blast 8, the bottom of Primary plateaus air classifier 1 connects the first feed bin 11 by the first material pipe 15；The discharging opening 202 of two grades of horizontal air classifiers 2 connects the charging aperture 301 of vertical air classifier 3, and the bottom of two grades of horizontal air classifiers 2 connects the first feed bin 11 by the second material pipe 16；The discharging opening 302 of vertical air classifier 3 connects the charging aperture 401 of whirlwind air classifier 4, and the bottom of vertical air classifier 3 connects the first feed bin 11 by the 3rd material pipe 17；The bottom of vertical air classifier 3 is additionally provided with secondary air intake vent 303, and secondary air intake vent 303 is connected with the air outlet 801 of air blast 8 by secondary air channel 14；The discharging opening 402 of whirlwind air classifier 4 connects the charging aperture 501 of cloth bag collector 5, and the bottom of whirlwind air classifier 4 connects the second feed bin 12；The air outlet 502 of cloth bag collector 5 connects exhaust outlet 7 by exhaust duct 6, and the bottom of cloth bag collector 5 connects the 3rd feed bin 13；Air exhauster 10 it is also associated with on exhaust duct 6.
Existingly, it is respectively provided with the horizontal air channel of level 104,203 in Primary plateaus air classifier 1 and two grades of horizontal air classifiers 2, and the air channel 203 of the air channel 104 of Primary plateaus air classifier 1 and two grades of horizontal air classifiers 2 is mutually communicated, vertical air classifier 3 then has the air channel 304 being vertically arranged and linearly bend, and whirlwind air classifier 4 then has and is vertically arranged and spiral air channel 403 upwards.In the present embodiment, the stroke in the air channel 203 of the air channel 104 of Primary plateaus air classifier 1 and two grades of horizontal air classifiers 2 is 10m, the stroke in the air channel 304 of vertical air classifier 3 is 5m, the stroke in the air channel 403 of whirlwind air classifier 4 is 3.5m, and the stroke in each air classifier air channel is iron ore powder movement travel in each air classifier.
Utilize the method that above-mentioned hierarchy system carries out 0-5mm grade air classification of iron core powder particle size, be by granularity be 0-5mm, water content less than 6% iron ore powder uniformly sent in Primary plateaus air classifier 1 by the charging aperture 101 of hopper and Primary plateaus air classifier 1, with air for selection by winnowing medium, under air blast 8 wind-force effect, iron ore powder passes sequentially through 1, two grades of horizontal air classifiers 2 of Primary plateaus air classifier, vertical air classifier 3, whirlwind air classifier 4 and cloth bag collector 5 and carries out grading；The blast of the air outlet 801 controlling air blast 8 in classification process is 15Kpa, and the solid-gas ratio of control system is 2kg/m3, the wind speed of the air intake vent 103 controlling Primary plateaus air classifier 1 is 25m/s, the wind speed of the secondary air intake vent 303 of vertical air classifier 3 is 20m/s, the wind speed of the charging aperture 401 of whirlwind air classifier 4 is 20 m/s, the wind speed of the charging aperture 501 of cloth bag collector 5 is 2.5 m/s；Concrete classification process is as follows:
(1) under Primary plateaus air classifier 1 selection by winnowing effect, the iron ore powder of 4-5mm grade is settled down to bottom Primary plateaus air classifier 1 and enters the first feed bin 11, under two grades of horizontal air classifier 2 selection by winnowing effects, the iron ore powder of 3-4mm grade is settled down to bottom two grades of horizontal air classifiers 2 and enters the first feed bin 11, and the iron ore powder selected introductions matter the most with the wind of 0-3mm grade enters vertical air classifier 3 through the charging aperture 301 of vertical air classifier 3；
(2) under vertical air classifier 3 selection by winnowing effect, the iron ore powder of 1-3mm grade is settled down to bottom vertical air classifier 3 and enters the first feed bin 11, and the iron ore powder selected introductions matter the most with the wind of 0-1mm grade enters whirlwind air classifier 4 through the charging aperture 401 of whirlwind air classifier 4；
(3) under the selection by winnowing effect of whirlwind air classifier 4, the iron ore powder of 0.15-1mm grade is settled down to bottom whirlwind air classifier 4 and enters the second feed bin 12, and the iron ore powder selected introductions matter the most with the wind of 0-0.15mm grade enters cloth bag collector 5 through the charging aperture 501 of cloth bag collector 5；
(4) when selected introductions matter with the wind is by cloth bag collector 5, the iron ore powder of 0-0.15mm grade is attached to 5 bags of walls of cloth bag collector or falls to bottom cloth bag collector 5, the iron ore powder of 0-0.15mm grade is all shaken off to the 3rd feed bin 13 after terminating by classification, and the selection by winnowing medium in cloth bag collector 5 is then discharged by exhaust duct 6 and exhaust outlet 7.
After classification terminates, the iron ore powder collecting the first feed bin 11 is sampled detection, and the iron ore powder recording 0-1mm grade accounts for 3%, has reached to efficiently separate the purpose of 0-1mm grade iron ore powder.
Embodiment
2
The present embodiment air classification of iron core powder particle size system is with embodiment 1.
The present embodiment utilize the method that above-mentioned hierarchy system carries out 0-5mm grade air classification of iron core powder particle size, be by granularity be 0-5mm, water content less than 6% iron ore powder uniformly sent in Primary plateaus air classifier 1 by the charging aperture 101 of hopper and Primary plateaus air classifier 1, with air for selection by winnowing medium, under air blast 8 wind-force effect, iron ore powder passes sequentially through 1, two grades of horizontal air classifiers 2 of Primary plateaus air classifier, vertical air classifier 3, whirlwind air classifier 4 and cloth bag collector 5 and carries out grading；The blast of the air outlet 801 controlling air blast 8 in classification process is 18Kpa, and the solid-gas ratio of control system is 1kg/m3, the wind speed of the air intake vent 103 controlling Primary plateaus air classifier 1 is 20m/s, the wind speed of the secondary air intake vent 303 of vertical air classifier 3 is 25m/s, the wind speed of the charging aperture 401 of whirlwind air classifier 4 is 15 m/s, the wind speed of the charging aperture 501 of cloth bag collector 5 is 3 m/s；Concrete classification process is with embodiment 1.
After classification terminates, the iron ore powder collecting the first feed bin is sampled detection, and the iron ore powder recording 0-1mm grade accounts for 4%, has reached to efficiently separate the purpose of 0-1mm grade iron ore powder.
Embodiment
3
The present embodiment air classification of iron core powder particle size system is with embodiment 1.
The present embodiment utilize the method that above-mentioned hierarchy system carries out 0-5mm grade air classification of iron core powder particle size, be by granularity be 0-5mm, water content less than 6% iron ore powder uniformly sent in Primary plateaus air classifier 1 by by the charging aperture 101 of hopper and Primary plateaus air classifier 1, with rotary kiln flue gas for selection by winnowing medium, under air blast 8 wind-force effect, iron ore powder passes sequentially through 1, two grades of horizontal air classifiers 2 of Primary plateaus air classifier, vertical air classifier 3, whirlwind air classifier 4 and cloth bag collector 5 and carries out grading；The blast of the air outlet 801 controlling air blast 8 in classification process is 20Kpa, and the solid-gas ratio of control system is 3kg/m3, the wind speed of the air intake vent 103 controlling Primary plateaus air classifier 1 is 30m/s, the wind speed of the secondary air intake vent 303 of vertical air classifier 3 is 23m/s, the wind speed of the charging aperture 401 of whirlwind air classifier 4 is 10 m/s, the wind speed of the charging aperture 501 of cloth bag collector 5 is 2 m/s；Concrete classification process is with embodiment 1.
After selection by winnowing terminates, the iron ore powder collecting the first feed bin is sampled detection, and the iron ore powder recording 0-1mm grade accounts for 2%, has reached to efficiently separate the purpose of 0-1mm grade iron ore powder.
Claims (2)
1. the method for a 0-5mm grade air classification of iron core powder particle size, it is characterized in that, using air classification of iron core powder particle size system, described system includes horizontal air classifier, vertical air classifier, whirlwind air classifier, cloth bag collector, the first feed bin, the second feed bin, the 3rd feed bin and exhaust outlet；Described horizontal air classifier, vertical air classifier and whirlwind air classifier all include that charging aperture and discharging opening, the charging aperture side of described horizontal air classifier are additionally provided with air intake vent, and described cloth bag collector includes charging aperture and air outlet；
The charging aperture of described horizontal air classifier connects has hopper, discharging opening to be connected with the charging aperture of vertical air classifier, the charging aperture side of horizontal air classifier is provided with air blast, and the described air outlet of air blast connects with the air intake vent level of horizontal air classifier, the bottom of horizontal air classifier connects the first feed bin；
The discharging opening of described vertical air classifier connects the charging aperture of whirlwind air classifier, and the bottom of vertical air classifier is connected with the first feed bin；The bottom of vertical air classifier is additionally provided with secondary air intake vent, and described secondary air intake vent is connected with the air outlet of air blast by secondary air channel；
The discharging opening of described whirlwind air classifier connects the charging aperture of cloth bag collector, and the bottom of described 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；
Described method be by granularity be 0-5mm, water content less than 6% iron ore powder by the charging aperture horizontal air classifier of uniformly feeding of hopper and horizontal air classifier, under air blast wind-force effect, iron ore powder passes sequentially through horizontal air classifier, vertical air classifier, whirlwind air classifier and cloth bag collector and carries out grading；The blast controlling blower outlet in classification process is 15-20Kpa, and the solid-gas ratio of control system is 1-3kg/m3, the air intake vent wind speed of the horizontal air classifier of control is 20-30m/s, the wind speed of vertical air classifier secondary air intake vent is 20-25m/s, the wind speed of whirlwind air classifier charging aperture is 10-20 m/s, the wind speed of cloth bag collector charging aperture is 2-3 m/s；Concrete classification process is as follows:
(1) under horizontal air classifier selection by winnowing effect, the iron ore powder of 3-5mm grade is settled down to bottom horizontal air classifier and enters the first feed bin, and the iron ore powder selected introductions matter the most with the wind of 0-3mm grade enters vertical air classifier through the charging aperture of vertical air classifier；
(2) under vertical air classifier selection by winnowing effect, the iron ore powder of 1-3mm grade is settled down to bottom vertical air classifier and enters the first feed bin, and the iron ore powder selected introductions matter the most with the wind of 0-1mm grade enters 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 bottom whirlwind air classifier and enters the second feed bin, and the iron ore powder selected introductions matter the most with the wind of 0-0.15mm grade enters cloth bag collector through the charging aperture of cloth bag collector；
(4) when selected introductions matter with the wind is by cloth bag collector, the iron ore powder of 0-0.15mm grade is attached to cloth bag collector bag wall or falls to bottom cloth bag collector, the iron ore powder of 0-0.15mm grade is all shaken off to the 3rd feed bin after terminating by classification, and the selection by winnowing medium in cloth bag collector is then discharged by exhaust duct and exhaust outlet.
The method of 0-5mm grade air classification of iron core powder particle size the most according to claim 1, it is characterised in that described selection by winnowing medium is air or rotary kiln carry out iron ore magnetizing roast after the flue gas discharged.
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