CN102600923B - Magnetite finish grinding system and grinding method thereof - Google Patents

Magnetite finish grinding system and grinding method thereof Download PDF

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Publication number
CN102600923B
CN102600923B CN201210062381.7A CN201210062381A CN102600923B CN 102600923 B CN102600923 B CN 102600923B CN 201210062381 A CN201210062381 A CN 201210062381A CN 102600923 B CN102600923 B CN 102600923B
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outlet
fine
type magnetic
grinding
boiling type
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CN201210062381.7A
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Chinese (zh)
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CN102600923A (en
Inventor
何亚民
魏勇
徐智平
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成都利君实业股份有限公司
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Abstract

The invention discloses a magnetite finish grinding system and a grinding method thereof. An outlet of a steady-flow constant-weight bin is connected with a high-pressure roller mill, one end of a second bucket elevator is arranged below the high-pressure roller mill, a multi-stage air powder concentrator is arranged at the other end of the second bucket elevator, a second belt conveyor is arranged below a coarse grain outlet of the multi-stage air powder concentrator and connected with a first bucket elevator, a second boiling type magnetic concentrator is arranged below a fine grain outlet of the multi-stage air powder concentrator, a fine concentrate outlet of the second boiling type magnetic concentrator is connected with a third belt conveyor, the third belt conveyor is connected with the first bucket elevator, the first bucket elevator is connected with an inlet of the steady-flow constant-weight bin, a fine powder outlet of the multi-stage air powder concentrator is connected with an inlet of a cyclone type dust collector, an outlet of the cyclone type dust collector is connected with a bag collector, another outlet of the cyclone type dust collector is connected with the first belt conveyor, and the first belt conveyor is connected with a first boiling type magnetic concentrator. The magnetite finish grinding system and the grinding method can be used for obtaining high-grade powdered iron, and are short in process, low in production cost, high in efficiency and fine in recovery effect.

Description

A kind of magnetic iron ore final grinding system and grinding method thereof
Technical field
The present invention relates to a kind of magnetic iron ore final grinding system and grinding method thereof, relate in particular to magnetic iron ore final grinding system and grinding method thereof to the magnetic separation of mineral grinding in the industry such as metallurgy, mine, belong to magnetic iron ore grinding technical field in metallurgy, mine.
Background technology
In the ore dressing field of the industries such as metallurgy, mine, need to carry out grinding and magnetic separation as iron ore to magnetic material, now studying energetically roll-in grinding technology and dry type magnetic separation technology in industry, particularly the research of roll squeezer and magnetic separator has obtained certain effect, but as the grinding magnetic separation system of magnetic iron ore, in actual use procedure formula, still exist system sufficiently complete and/or sort the problems such as rate is not high.As:
Chinese Patent Application No. is 201110130407.2, the applying date is on 05 19th, 2011, publication number is CN102240588A, name is called the Chinese invention patent of " a kind of magnetic iron ore dry grinding dry dressing method ", this disclosure of the invention a kind of method: magnetic iron ore tcrude ore is sent into disintegrating machine coarse crushing, after fragmentation, send into bolting, oversize send into broken in disintegrating machine after, send into high-pressure roller mill and carry out in small, broken bits together with screenings; Ore after in small, broken bits through scattering grader break up with classification after, obtain the product of coarse grain, particulate, three grades of fine powder; Coarse fraction product returns to high-pressure roller mill, and fine fraction product is sent into dry-type magnetic extractor magnetic separation, and fine tailings is dry heap directly, and fine concentrate returns to high-pressure roller mill and forms closed circuitly, and fine powder level product is sent into whirlwind magnetic separator, obtains concentrate or half concentrate.Its dry-type magnetic extractor or whirlwind magnetic separator treating capacity and efficiency are all poor, and bagroom can only reclaim superfine powder, and its recovering effect is not good, efficiency is low.
Chinese Patent Application No. is 201110002018.1, the applying date is on 01 07th, 2011, publication number is CN102179272A, name is called the Chinese invention patent of " slag, slag micropowder production line final grinding system of roll squeezer ", the disclosed technical scheme of this patent is: the first bucket elevator is to flow stabilizing weighing cabin feeding, and the product of roll squeezer is scattering and grading in V-type powder concentrator; High temperature fast boiling stove is connected with the air inlet of V-type powder concentrator, between V-type powder concentrator and ultra-fine seperator, be provided with and dry pipe and rotoclone collector, the air inlet that Guan Houyu rotoclone collector is dried in the air outlet series connection of V-type powder concentrator connects, the air outlet of rotoclone collector is connected with the air inlet of ultra-fine seperator by pipeline, below rotoclone collector and ultra-fine seperator, be provided with chute, the least significant end of chute is positioned at the top of the second bucket elevator feed hopper.This system can not be carried out grade-classification, and selected slag, slag can not be upgrade.
Summary of the invention
The object of the invention is to: a kind of magnetic iron ore final grinding system and grinding method thereof are provided, solve in existing grinding system, exist system throughput and efficiency is poor, recovering effect is not good, can not carry out grade-classification, selected slag, slag can not reach the technical problem of required grade and output requirement, thereby can effectively solve above-mentioned problems of the prior art.
The object of the invention is to realize by following technical proposals: a kind of magnetic iron ore final grinding system, comprise steady-flow constant-weight storehouse, high-pressure roller mill, a bucket elevator, No. two bucket elevators, multi-staged air powder concentrator, a belt feeder, a piling tails, concentrate mouth, No. two belt feeders, No. three belt feeders, whirlwind dust-precipitator, bagroom, a boiling type magnetic separator and No. two boiling type magnetic separators, the outlet of described steady-flow constant-weight storehouse connects high-pressure roller mill, the below of described high-pressure roller mill is one end of No. two bucket elevators, the other end of No. two bucket elevators is multi-staged air powder concentrator, the coarse grain outlet below of described multi-staged air powder concentrator is No. two belt feeders, No. two belt feeders and a bucket elevator join, the particulate outlet below of described multi-staged air powder concentrator is established boiling type magnetic separator No. two, the fine concentrate outlet of No. two boiling type magnetic separators is joined with No. three belt feeders, No. three belt feeders and a bucket elevator join, and the entrance of a described bucket elevator and steady-flow constant-weight storehouse joins, fine powder outlet and the entrance of whirlwind dust-precipitator of described multi-staged air powder concentrator join, one outlet of whirlwind dust-precipitator is joined with bagroom, another outlet connects belt feeder No. one, a belt feeder and a boiling type magnetic separator join, and No. one boiling type magnetic separator is provided with fine powder concentrate mouth.
As a kind of optimal way, be provided with blower fan at described whirlwind dust-precipitator and multi-staged air powder concentrator place.
As further preferred embodiment, the fine tailings of described No. two boiling type magnetic separators goes out No. two piling tails of interruption-forming.
As further preferred embodiment, the fine tailings of a described boiling type magnetic separator goes out piling tails of interruption-forming.
The whole grinding method of a kind of magnetic iron ore, comprises the steps:
The first step: the mineral after slightly broken are sent in steady-flow constant-weight storehouse, then flowed into and carry out roll-in in high-pressure roller mill;
Second step: the material after roll-in by No. two bucket elevators send in multi-staged air powder concentrator, break up with classification after obtain coarse grain, particulate, No. two particulates and fine powder;
Coarse grain again enters steady-flow constant-weight storehouse after No. two belt feeders transfer to a bucket elevator;
After a particulate and No. two particulates merge, enter No. two boiling type magnetic separators and carry out magnetic separation and throw tail, the fine tailings of throwing after tail forms No. two piling tails, and the fine concentrate of throwing after tail transfers to bucket elevator No. one through No. three belt feeders, again enters steady-flow constant-weight storehouse;
The 3rd step: fine powder enters bagroom and reclaims after whirlwind dust-precipitator, enters a boiling type magnetic separator and carries out magnetic separation and throw tail after recovery, the fine powder mine tailing of throwing after tail forms a piling tails, and fine powder concentrate flows out from concentrate mouth.
As a kind of optimal way, in the first step, the inlet amount that the mineral after thick breaking enter in steady-flow constant-weight storehouse is 300t/h~800t/h, and the treating capacity of carrying out roll-in in high-pressure roller mill is 800t/h~2000t/h.
As a kind of optimal way, in second step, coarse grain transfers to bucket elevator with the amount of 300t/h~1500t/h No. one through No. two belt feeders; After merging, a particulate and No. two particulates enter boiling type magnetic separator No. two with the amount of 100t/h~600t/h.
As a kind of optimal way, the 3rd step: powder particle size is-fine powder that 0.2mm~0.025mm, amount are 200t/h~600t/h is through whirlwind dust-precipitator.
Compared with prior art, beneficial effect of the present invention: magnetic iron ore final grinding system of the present invention and grinding method thereof can carry out grade-classification selection and magnetic separation by the magnetic iron ore after slightly breaking after high-pressure roller mill roll-in, obtain the iron fine powder that grade is higher, this system flow is short, production cost is low, floor space is little, steel consumption and power consumption are little, do not consume water, treating capacity is large, efficiency is high, recovering effect is good, magnetic iron ore is once by just reaching required grade and output requirement after native system, therefore, native system is a kind of energy-conservation, efficiently, free of contamination magnetic iron ore final grinding system and grinding method thereof.
Accompanying drawing explanation
Fig. 1 is the structural representation of magnetic iron ore final grinding system of the present invention.
The specific embodiment
Below in conjunction with specific embodiments and the drawings, the present invention is further illustrated.
Disclosed all features in this description, or step in disclosed all methods or process, except the speciality and/or step of mutual repulsion, all can combine by any way, unless narration especially, all can be replaced by other equivalences or the alternative features with similar object,, unless narration especially, an embodiment in a series of equivalences of each feature or similar characteristics.
As shown in Figure 1, magnetic iron ore final grinding system of the present invention and grinding method thereof comprise steady-flow constant-weight storehouse 1, high-pressure roller mill 2, a bucket elevator 3, No. two bucket elevators 4, multi-staged air powder concentrator 5, a belt feeder 9, a piling tails 11, concentrate mouth 12, No. two belt feeders 14, No. two piling tails 15 and No. three belt feeders 16, it is characterized in that: also comprise whirlwind dust-precipitator 6, bagroom 8, a boiling type magnetic separator 10 and No. two boiling type magnetic separators 13, the outlet of described steady-flow constant-weight storehouse 1 connects high-pressure roller mill 2, the below of described high-pressure roller mill 2 is one end of No. two bucket elevators 4, the other end of No. two bucket elevators 4 is multi-staged air powder concentrator 5.The coarse grain outlet below of described multi-staged air powder concentrator 5 is No. two belt feeders 14, No. two belt feeders 14 and a bucket elevator 3 join, the particulate outlet below of described multi-staged air powder concentrator 5 is established boiling type magnetic separator 13 No. two, the fine tailings of described No. two boiling type magnetic separators 13 goes out No. two piling tails 15 of interruption-forming, the fine concentrate outlet of No. two boiling type magnetic separators 13 is joined with No. three belt feeders 16, No. three belt feeders 16 and a bucket elevator 3 join, and a described bucket elevator 3 joins with the entrance of steady-flow constant-weight storehouse 1; Fine powder outlet and the entrance of whirlwind dust-precipitator 6 of described multi-staged air powder concentrator 5 join, and are provided with blower fan 7 at described whirlwind dust-precipitator 6 and multi-staged air powder concentrator 5 places.One outlet of whirlwind dust-precipitator 6 is joined with bagroom 8, another outlet connects belt feeder 9 No. one, a belt feeder 9 and a boiling type magnetic separator 10 join, No. one boiling type magnetic separator 10 is provided with fine powder concentrate mouth 12, and the fine tailings of a described boiling type magnetic separator 10 goes out piling tails 11 of interruption-forming.
The whole grinding method of magnetic iron ore of the present invention, comprises the steps:
The first step: the mineral that granularity is 0~75mm after thick broken are admitted in steady-flow constant-weight storehouse 1, then flow into and in high-pressure roller mill 2, carry out roll-in;
Second step: the material after roll-in by No. two bucket elevators 4 send in multi-staged air powder concentrator 5, break up with classification after obtain the product of >3mm coarse grain, particulate of-3mm~0.2mm, No. bis-particulates of-3mm~0.2mm and four grades of <0.2mm fine powder;
Coarse grain again enters steady-flow constant-weight storehouse 1 after No. two belt feeders 14 transfer to a bucket elevator 3; After a particulate and No. two particulates merge, entering No. two boiling type magnetic separators 13 carries out magnetic separation and throws tail, the fine tailings of throwing after tail forms No. two piling tails 15, the fine concentrate of throwing after tail transfers to bucket elevator 3 No. one through No. three belt feeders 6, again enter in steady-flow constant-weight storehouse 1 and high-pressure roller mill 2, form circulation;
The 3rd step: fine powder enters bagroom 8 and reclaims after whirlwind dust-precipitator 6, after recovery, entering a boiling type magnetic separator 10 carries out magnetic separation and throws tail, the fine powder mine tailing of throwing after tail forms a piling tails 11, fine powder concentrate flows out from concentrate mouth 12, fine powder concentrate grade is from bringing up to below 20% more than 55%, and fine powder concentrate flows out and forms product or enter next process through concentrate mouth 12.
embodiment 1:
The poor magnetic iron ore in somewhere, Shanxi, raw ore all iron content 11.5%, Armco magnetic iron content 6.8%,
The mineral that granularity is 0~75mm after thick breaking are admitted in steady-flow constant-weight storehouse, inlet amount is that 500t/h flows into high-pressure roller mill again and carries out roll-in, high-pressure roller mill treating capacity is 1500t/h, material after roll-in by No. two bucket elevators send into multi-staged air powder concentrator break up with classification after, obtain >3mm coarse grain, particulate of-3mm~0.2mm and-product of No. bis-particulates of 3mm~0.2mm, four grades of <0.2mm fine powder; The amount of coarse fraction product is that 1200t/h returns to high-pressure roller mill through No. two belt feeders and a bucket elevator, forms circulation; Particulate and No. two particulate two-step product merging amounts are that 400t/h sends into No. two boiling type magnetic separators and carries out magnetic separation and throw tail, throw the fine tailings amount of tail and be 200t/h directly dry heap form No. two piling tails, to be 200t/h return to high-pressure roller mill through No. three belt feeders and a bucket elevator to fine concentrate amount forms closed circuit; Fine powder level product granularity is-0.2mm~0.025mm amount reclaims through whirlwind dust-precipitator for 400t/h, fine powder level product granularity reclaims through bagroom for 100t/h for-0.025mm amount, after two kinds of fine powders merge, sending into a boiling type magnetic separator by a belt feeder carries out magnetic separation and throws tail, the fine powder mine tailing amount of throwing tail is a directly piling tails of dry heap formation of 400t/h, fine powder concentrate grade is from bringing up to below 20% more than 55%, and fine powder concentrate amount is that 300t/h flows out and forms product or enter next process through concentrate mouth.Blower fan provides wind-force for whirlwind dust-precipitator and multi-staged air powder concentrator.
Magnetic iron ore final grinding system of the present invention and grinding method thereof adopt high-pressure roller mill, multistage wind-force powder concentrator and boiling type magnetic separation to get machine magnetic separation, by material from-75mm, the choosing of broken limit, limit to-0.5mm even-below 0.2mm, grade is from bringing up to below 20% more than 55%, be suitable for the production of the magnetic iron ore in drought and water shortage area, because the feed preparation unit size of high-pressure roller mill is larger, therefore crushing circuit is simplified greatly; The dry type mine tailing that production obtains can be used as building sand, need not build Tailings Dam, has saved substantial contribution, has saved land resource.
Flow process of the present invention is short, and production cost is low, and floor space is little, and steel consumes, power consumption is little, does not consume water, and recovering effect is good, is a kind of energy-conservation, efficient, free of contamination magnetic iron ore final grinding system and grinding method thereof.
embodiment 2:
The poor magnetic iron ore of In A Certain Place of Xinjiang, raw ore all iron content 18.6%, Armco magnetic iron content 15.3%
The mineral that granularity is 0~75mm after thick breaking are admitted in steady-flow constant-weight storehouse, inlet amount is that 700t/h flows into high-pressure roller mill again and carries out roll-in, high-pressure roller mill treating capacity is 1200t/h, material after roll-in by No. two bucket elevators send into multi-staged air powder concentrator break up with classification after, obtain >3mm coarse grain, particulate of-3mm~0.2mm and-product of No. bis-particulates of 3mm~0.2mm, four grades of <0.2mm fine powder; The amount of coarse fraction product is that 1400t/h returns to high-pressure roller mill through No. two belt feeders and a bucket elevator, forms circulation; Particulate and No. two particulate two-step product merging amounts are that 350t/h sends into No. two boiling type magnetic separators and carries out magnetic separation and throw tail, throw the fine tailings amount of tail and be 450t/h directly dry heap form No. two piling tails, to be 450t/h return to high-pressure roller mill through No. three belt feeders and a bucket elevator to fine concentrate amount forms closed circuit; Fine powder level product granularity is-0.2mm~0.025mm amount reclaims through whirlwind dust-precipitator for 350t/h, fine powder level product granularity reclaims through bagroom for 150t/h for-0.025mm amount, after two kinds of fine powders merge, sending into a boiling type magnetic separator by a belt feeder carries out magnetic separation and throws tail, the fine powder mine tailing amount of throwing tail is a directly piling tails of dry heap formation of 400t/h, fine powder concentrate grade is from bringing up to below 20% more than 55%, and fine powder concentrate amount is that 400t/h flows out and forms product or enter next process through concentrate mouth.Blower fan provides wind-force for whirlwind dust-precipitator and multi-staged air powder concentrator.
A kind of magnetic iron ore final grinding system of the present invention and grinding method thereof adopt high-pressure roller mill, multistage wind-force powder concentrator and boiling type magnetic separation to get machine magnetic separation, by material from-75mm, the choosing of broken limit, limit to-0.5mm even-below 0.2mm, grade is from bringing up to below 20% more than 55%, be suitable for the production of the magnetic iron ore in drought and water shortage area, because the feed preparation unit size of high-pressure roller mill is larger, therefore crushing circuit is simplified greatly; The dry type mine tailing that production obtains can be used as building sand, need not build Tailings Dam, has saved substantial contribution, has saved land resource.
Flow process of the present invention is short, and production cost is low, and floor space is little, and steel consumes, power consumption is little, does not consume water, and recovering effect is good, is a kind of energy-conservation, efficient, free of contamination magnetic iron ore final grinding system and grinding method thereof.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.

Claims (7)

1. a magnetic iron ore final grinding system, comprise steady-flow constant-weight storehouse, high-pressure roller mill, bucket elevator, No. two bucket elevators, multi-staged air powder concentrator, belt feeder, concentrate mouth, No. two belt feeders and No. three belt feeders, it is characterized in that: also comprise whirlwind dust-precipitator, bagroom, a boiling type magnetic separator and No. two boiling type magnetic separators, the outlet of described steady-flow constant-weight storehouse connects high-pressure roller mill, the below of described high-pressure roller mill is one end of No. two bucket elevators, and the other end of No. two bucket elevators is multi-staged air powder concentrator; The coarse grain outlet below of described multi-staged air powder concentrator is No. two belt feeders, No. two belt feeders and a bucket elevator join, the particulate outlet below of described multi-staged air powder concentrator is established boiling type magnetic separator No. two, the fine concentrate outlet of No. two boiling type magnetic separators is joined with No. three belt feeders, No. three belt feeders and a bucket elevator join, and the entrance of a described bucket elevator and steady-flow constant-weight storehouse joins; Fine powder outlet and the entrance of whirlwind dust-precipitator of described multi-staged air powder concentrator join, one outlet of whirlwind dust-precipitator is joined with bagroom, another outlet connects belt feeder No. one, a belt feeder and a boiling type magnetic separator join, and No. one boiling type magnetic separator is provided with fine powder concentrate mouth; Be provided with blower fan at described whirlwind dust-precipitator and multi-staged air powder concentrator place.
2. magnetic iron ore final grinding system as claimed in claim 1, is characterized in that: the fine tailings of described No. two boiling type magnetic separators goes out No. two piling tails of interruption-forming.
3. magnetic iron ore final grinding system as claimed in claim 1, is characterized in that: the fine tailings of a described boiling type magnetic separator goes out piling tails of interruption-forming.
4. the grinding method of magnetic iron ore final grinding system as claimed in claim 1, is characterized in that: comprise the steps:
The first step:
Mineral after slightly broken are sent in steady-flow constant-weight storehouse, then flowed into and in high-pressure roller mill, carry out roll-in;
Second step: the material after roll-in by No. two bucket elevators send in multi-staged air powder concentrator, break up with classification after obtain coarse grain, particulate, No. two particulates and fine powder;
Coarse grain again enters steady-flow constant-weight storehouse after No. two belt feeders transfer to a bucket elevator;
After a particulate and No. two particulates merge, enter No. two boiling type magnetic separators and carry out magnetic separation and throw tail, the fine tailings of throwing after tail forms No. two piling tails, and the fine concentrate of throwing after tail transfers to bucket elevator No. one through No. three belt feeders, again enters steady-flow constant-weight storehouse;
The 3rd step: fine powder enters bagroom and reclaims after whirlwind dust-precipitator, enters a boiling type magnetic separator and carries out magnetic separation and throw tail after recovery, the fine powder mine tailing of throwing after tail forms a piling tails, and fine powder concentrate flows out from concentrate mouth.
5. the whole grinding method of magnetic iron ore as claimed in claim 4, is characterized in that: in the first step, the inlet amount that the mineral after thick breaking enter in steady-flow constant-weight storehouse is 300t/h~800t/h, and the treating capacity of carrying out roll-in in high-pressure roller mill is 800t/h~2000t/h.
6. the whole grinding method of magnetic iron ore as claimed in claim 4, is characterized in that: in second step, coarse grain transfers to bucket elevator with the amount of 300t/h~1500t/h No. one through No. two belt feeders; After merging, a particulate and No. two particulates enter boiling type magnetic separator No. two with the amount of 100t/h~600t/h.
7. the whole grinding method of magnetic iron ore as claimed in claim 4, is characterized in that: the 3rd step: and powder particle size is-and fine powder that 0.2mm~0.025mm, amount are 200t/h~600t/h is through whirlwind dust-precipitator.
CN201210062381.7A 2012-03-12 2012-03-12 Magnetite finish grinding system and grinding method thereof CN102600923B (en)

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CN204974152U (en) * 2015-02-15 2016-01-20 胡沿东 System is selected in ore deposit
CN205095934U (en) * 2015-02-15 2016-03-23 胡沿东 System is selected in ore deposit
CN104815739B (en) * 2015-05-11 2017-04-26 成都建筑材料工业设计研究院有限公司 Magnetite dry grinding and dry separation method and device
CN105435938B (en) * 2015-12-31 2018-04-27 溧阳中材重型机器有限公司 A kind of cement Joint grinding system
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