CN100531917C - Mineral dressing technique for low ore grade iron ore and mineral dressing equipment thereof - Google Patents

Mineral dressing technique for low ore grade iron ore and mineral dressing equipment thereof Download PDF

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Publication number
CN100531917C
CN100531917C CNB2007101574342A CN200710157434A CN100531917C CN 100531917 C CN100531917 C CN 100531917C CN B2007101574342 A CNB2007101574342 A CN B2007101574342A CN 200710157434 A CN200710157434 A CN 200710157434A CN 100531917 C CN100531917 C CN 100531917C
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wet type
ore
sent
coarse
fine crushing
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CNB2007101574342A
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CN101130177A (en
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王林
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王林
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Abstract

The invention discloses a low-grade iron ore dressing technique and equipment in the ore dressing technical domain, which comprises the following steps: doing rough breaking and once fine breaking; proceeding dry cleaning and sieving; milling; separating; doing magnetic cobbing and high-frequency sieving; filtering; sieving twice for ore material; obtaining the product. The ore dressing equipment comprises the following parts: rough breaking machine, fine breaking machine, dry cleaning bolter, storage bin, ball mill, separatory machine, magnetic cobber, high-frequency sieve, filter, a set of wet rougher unit between the storage bin and the separatory machine, wherein the wet rougher unit contains band conveyer, twice bolter, wet fine grinder, wet bolter and wet rougher. The invention improves the production by 1-2 times under the same energy consumption condition in comparison with the present technique and equipment, which utilizes the low-grade iron ore resource sufficiently.

Description

Iron ore of low ore grade ore-dressing technique and preparation equipment thereof
Technical field
The present invention relates to the technique of preparing field, particularly a kind of iron ore of low ore grade ore-dressing technique and preparation equipment thereof.
Background technology
Along with the development of steel and iron industry,, particularly increasing to the demand of iron ore concentrate to the demand of iron ore.Because how high-grad iron ore deposit reserves resource-constrained utilizes the resourceful lean ore resource of reserves just to become the task of top priority.The technical process of development and use lean ore resource comprises the following steps: iron ore is carried out coarse crushing, fine crushing, dry separation screening, ball milling, sub-material, magnetic separation, high frequency screening, secondary magnetic separation at present, the waste residue that dry separation is sieved out is transported, the mine tailing that magnetic separation is selected is delivered to tailing dam, and fine ore is sent into the concentrate pond.This technology is applicable to that grade is at 20% left and right sides lean ore, and for grade when the iron ore below 15% carries out ore dressing, productivity ratio is too low, cost is too high, particularly to grade when the so-called soft iron ore that is entrained with a large amount of earth that is formed by decomposed rock of the extremely low-grade of 4-8% is handled, can't obtain actual economic benefit at all.Therefore must be improved existing technology and equipment.
Summary of the invention
The purpose of this invention is to provide a kind of iron ore of low ore grade ore-dressing technique and preparation equipment thereof, can carry out ore dressing to iron ore of low ore grade effectively, with comparing of the existing preparation equipment of equal specification, output can improve 1-2 doubly.
The objective of the invention is to realize by following technical proposals:
According to iron ore of low ore grade ore-dressing technique of the present invention, comprise coarse crushing, fine crushing, dry separation screening, ball milling, depiler sub-material, magnetic separation, a high frequency screening, filter, it is characterized in that comprising the steps:
1) will send into rescreener by storage bin through conveyer belt through the mineral aggregate that coarse crushing, fine crushing, a dry separation screening are sieved out and carry out regrading,
2) the rough wet type fine crushing machine of sending into that regrading sieved out carries out the secondary fine crushing, and the fines that is sieved out is sent into the wet type coarse classifier and carried out wet type and roughly select,
3) through the mineral aggregate of secondary fine crushing through the screening of wet screening machine, the coarse fodder of telling is sent storage bin back to, the fines of telling is sent into the wet type coarse classifier and is carried out wet type and roughly select,
4) wet type is roughly selected selected fines and is sent into depiler and carry out sub-material, and the coarse fodder of being told is sent ball mill back to and carried out ball milling, and the fines of being told is sent into a magnetic separator and carried out a magnetic separation,
5) the part coarse fodder in the storage bin is also sent into ball mill and is carried out ball milling through going into the abrasive material case, and part is sent into secondary fine crushing machine and carried out the secondary fine crushing,
6) to sieving with the high frequency screening machine through the selected breeze of magnetic separator, the fines that sieves out is carried out the secondary magnetic separation by the secondary magnetic separator, and the fine iron breeze of selecting is sent into the fine iron breeze pond after filtering through filter, sends the coarse fodder of selecting back to ball mill and carries out ball milling, enter next circulation
7) dry separation is sieved a hair slag that is sieved out and is sent to a mao slag field, and the selected mine tailing of each magnetic separator is sent to the tailingspile.
Also the mineral aggregate that described dry separation screening is sieved out can be delivered to dry-type magnetic extractor by storage bin through conveyer belt, selected mineral aggregate is sent into secondary fine crushing machine again and is carried out the secondary fine crushing, and the hair slag that is sieved out is sent to a mao slag field.
Coarse fodder in the described storage bin is directly sent into ball mill and is carried out ball milling and partly account for 18-22%, sends into secondary fine crushing machine and carries out the secondary fine crushing and partly account for 82-78%.
A kind of preparation equipment that is used for described iron ore of low ore grade ore-dressing technique of the present invention, comprise coarse crushing machine, fine crushing machine, dry separation screening machine, storage bin, ball mill, depiler, magnetic separator, high frequency sieve, filter, it is characterized in that: set up a cover wet type and roughly select unit between described storage bin and depiler, this wet type is roughly selected unit and is comprised conveyer belt, rescreener, wet type fine crushing machine, wet screening machine and the wet type coarse classifier that connects successively.
Also can between described conveyer belt and rescreener, be provided with a dry-type magnetic extractor.
Described secondary fine crushing machine is a hammer mill, on the charge door of this hammer mill, be provided with water inlet pipe, the charge door place is provided with the backgauge chain screen in the casing of this hammer mill, the upper end of this backgauge chain screen is fixed on the charge door of described hammer mill, the lower end is a free end, is provided with bucker on the bearing of this hammer mill.
Described wet type coarse classifier is the wet type coarse granule iron ore strong magnetic separator that is provided with priming apparatus, above this wet type coarse granule iron ore strong magnetic separator, be provided with to the ore deposit case, be provided with striker plate for the magnetic separator support of case outlet left front, ore deposit with respect to this, this is provided with the screening batcher for the upper right side of ore deposit case.
Described screening batcher is the vibratory sieve that has eccentric vibrating device.
Described eccentric vibrating device is by motor, and the turning cylinder that is connected of motor is located at the eccentric wheel on this turning cylinder therewith, and the bearing block that this turning cylinder is connected on the vibratory sieve screen frame (unit) is formed.
The described motor mode that is connected with turning cylinder is: the output shaft of motor is provided with small pulley, and this small pulley is connected with big belt wheel on the turning cylinder by belt.
Iron ore of low ore grade ore-dressing technique of the present invention and preparation equipment thereof have following advantage:
1, owing to set up wet type secondary fine crushing machine, in the process of breaking ores, the earth that water will be mixed in the mineral aggregate rinses out, and has therefore reduced the load of back step operation individual device, has improved operating efficiency; Simultaneously, flowing water also makes the material flow in the disintegrating machine unimpeded, and fines flows away very soon, and coarse fodder obtains sufficient fragmentation, has improved the operating efficiency of disintegrating machine;
2, owing to set up wet type coarse granule iron ore strong magnetic separator, the water earth that will be mixed in the mineral aggregate rinses out once more in the process of magnetic separation; Because this wet type coarse granule iron ore strong magnetic separator has adopted from the top feed-type, iron charge can be more effectively adsorbed by strong magnetic, and mine tailing is easy to be washed away by current, has improved the operating efficiency of magnetic separator;
3, owing to set up wet screening machine and wet type coarse classifier, to sieve with wet type through the material behind the wet type secondary fine crushing crusher machine and roughly select, selected coarse granule Iron Ore Powder grade can reach 40-49%, both can send into ball mill and carry out ball milling, can be used as the coarse granule Iron Ore Powder again and sells;
4, screening machine of the present invention is the high frequency shale shaker that has eccentric vibrating device, because this eccentric vibrating device is to be located at sieve nest motor drives eccentric wheel bump sieve nest in addition, make sieve nest produce dither, the mode of this generation dither is simple and reliable, long service life, maintenance work is simple;
5, under the situation of lack of water, also can between conveyer belt and rescreener, be provided with a dry-type magnetic extractor, the non iron material that disperses is removed in choosing, alleviates the load of wet type secondary fine crushing machine, has improved its operating efficiency.
6, adopt iron ore of low ore grade ore-dressing technique of the present invention and preparation equipment thereof, but the contraposition product carry out ore dressing at the iron ore below 15%, productivity ratio significantly improves, and cost reduces, and particularly can handle at the iron ore of the extremely low-grade of 4-8% by the contraposition product.Compare with equipment with the existing technology of equal scale, sort equal low-grade iron ore, under the condition of same power consumption, output can improve 1-2 doubly, thereby makes full use of the iron ore deposit of this extremely low-grade, has remarkable economic efficiency and social benefit.
Description of drawings
Fig. 1 is a process chart of the present invention.
Fig. 2 is the structural representation of secondary fine crushing machine.
Fig. 3 is the structural representation of wet type coarse granule iron ore strong magnetic separator.
Fig. 4 is the structural representation of eccentric vibrating device.
The specific embodiment
Below in conjunction with description of drawings the specific embodiment of the present invention.
As shown in Figure 1,, comprise coarse crushing, fine crushing, dry separation screening, ball milling, depiler sub-material, magnetic separation, a high frequency screening, filter, it is characterized in that comprising the steps: according to iron ore of low ore grade ore-dressing technique of the present invention
1) will send into rescreener 5 by storage bin 4 through conveyer belt through the mineral aggregate that coarse crushing, fine crushing, a dry separation screening machine 3 are sieved out and carry out regrading,
2) the rough wet type fine crushing machine 6 of sending into that sieved out of rescreener 5 carries out the secondary fine crushing, and the fines that is sieved out is sent into wet type coarse classifier 8 and carried out wet type and roughly select,
3) through the mineral aggregate of secondary fine crushing through 7 screenings of wet screening machine, the coarse fodder of telling is sent storage bin 4 back to, the fines of telling is sent into wet type coarse classifier 8 and is carried out wet type and roughly select,
4) wet type coarse classifier 8 selected fineves are sent into depiler 10 and are carried out sub-material, and the coarse fodder of being told is sent ball mill 9 back to and carried out ball milling, and the fines of being told is sent into a magnetic separator 11 and carried out a magnetic separation,
5) the part coarse fodder in the storage bin 4 is also sent into ball mill 9 and is carried out ball milling through going into the abrasive material case, and part is sent into secondary fine crushing machine 6 and carried out the secondary fine crushing,
6) sieve delivering to high frequency screening machine 13 with slag stock pump 12 through magnetic separator 11 selected breezes, the fines that sieves out is carried out the secondary magnetic separation by secondary magnetic separator 14, the fine iron breeze of selecting is sent into the fine iron breeze pond after filtering through filter 15, send the coarse fodder of selecting back to ball mill 9 and carry out ball milling, enter next circulation
7) dry separation screening machine 3 sieved out the hair slag be sent to a mao slag field, the selected mine tailing of each magnetic separator is sent to the tailingspile.
Also the mineral aggregate that described dry separation screening machine 3 is sieved out can be delivered to dry-type magnetic extractor by storage bin through conveyer belt, selected mineral aggregate is sent into secondary fine crushing machine 6 again and is carried out the secondary fine crushing, and the hair slag that is sieved out is sent to a mao slag field.
Coarse fodder in the described storage bin is directly sent into ball mill and is carried out ball milling and partly account for 18-22%, sends into secondary fine crushing machine and carries out the secondary fine crushing and partly account for 82-78%.
As shown in Figure 1, a kind of preparation equipment that is used for described iron ore of low ore grade ore-dressing technique of the present invention, comprise coarse crushing machine 1, fine crushing machine 2, dry separation screening machine 3, storage bin 4, ball mill 9, depiler 10, magnetic separator 11,14, high frequency sieve 13, filter 15, it is characterized in that: set up a cover wet type and roughly select unit between described storage bin 4 and depiler 10, this wet type is roughly selected unit and is comprised conveyer belt, rescreener 5, wet type fine crushing machine 6, wet screening machine 7 and the wet type coarse classifier 8 that connects successively.
Also can between described conveyer belt and rescreener 5, establish a dry-type magnetic extractor (not shown).
As shown in Figure 2, described secondary fine crushing machine 6 is a hammer mill 60, charge door place at this hammer mill 60 is provided with water inlet pipe 62, the charge door place is provided with backgauge chain screen 61 in the casing of this hammer mill 60, the upper end of this backgauge chain screen 61 is fixed on the charge door of described hammer mill, the lower end is a free end,, on the bearing of this hammer mill 60, be provided with bucker 67.This hammer mill 60 is by screening dispenser 64 feeds that have eccentric vibrating device 65, and the oversize 63 of screening dispenser 64 is sent into hammer mill 60, and spoil area is sent in minus mesh 66.Be sent to wet screening machine 7 through broken ore via discharging opening 68.
As shown in Figure 3, described wet type coarse classifier 8 is for being provided with the wet type coarse granule iron ore strong magnetic separator 80 of priming apparatus 81, above this wet type coarse granule iron ore strong magnetic separator 80, be provided with to ore deposit case 84, be provided with striker plate 82 for the magnetic separator support of ore deposit case 84 outlet left fronts with respect to this, this is provided with screening dispenser 86 for the upper right side of ore deposit case 82.This wet type coarse granule iron ore strong magnetic separator 80 is by screening dispenser 86 feeds that have eccentric vibrating device 87, and the oversize 85 of screening dispenser 86 is sent into to ore deposit case 82, and spoil area is sent in minus mesh 66.The iron ore material that the process magnetic separation is selected is via discharging opening 88 dischargings, and the mine tailing of selecting is sent to the tailingspile.
Described screening dispenser 86 is for having the vibratory sieve of eccentric vibrating device 87.
As shown in Figure 4, described eccentric vibrating device 87 is by motor 878, and the turning cylinder 875 that is connected of motor 878 is located at the eccentric wheel 876 on this turning cylinder 875 therewith, and this turning cylinder is connected to 874,877 compositions of bearing block on the vibratory sieve screen frame (unit).
Described motor 878 mode that is connected with turning cylinder 875 is: the output shaft of motor 878 is provided with small pulley 871, and this small pulley 871 is connected with big belt wheel 873 on the turning cylinder 875 by belt 872.
Iron ore of low ore grade ore-dressing technique of the present invention and preparation equipment thereof have following advantages:
1, owing to set up wet type secondary type fine disintegrating machine and wet type coarse particle iron ore strong magnetic magnetic separator, In the process of breaking ores and in the process of magnetic separation, the earth that water will be mixed in the mineral aggregate rinses out, Therefore reduce the load of rear step operation individual device, improved operating efficiency; Simultaneously, flowing water also makes Material flow in the disintegrating machine is unimpeded, and fines flows away very soon, and coarse fodder obtains sufficient fragmentation, has improved broken The operating efficiency of broken machine;
2, because wet type coarse particle iron ore strong magnetic magnetic separator has adopted from the top feed-type, iron charge can More effectively to be adsorbed by strong magnetic, mine tailing is easy to be washed away by current, has improved the work of magnetic separator Efficient;
3, owing to having set up wet screening machine and wet type coarse classifier, will be through the fragmentation of wet type secondary type fine disintegrating machine After material sieve with wet type and roughly select, selected coarse granule Iron Ore Powder grade can reach 40-49%, Both can send into ball mill and carry out ball milling, and can be used as again the coarse granule Iron Ore Powder and sell;
4, screening machine of the present invention is the high frequency shale shaker with eccentric vibration apparatus, because this off-centre Vibrating device is to be located at sieve nest motor drives eccentric wheel bump sieve nest in addition, makes sieve nest produce high frequency Vibration, the mode of this generation dither is simple and reliable, long service life, maintenance work is simple and easy to OK;
5, in the situation of lack of water, also can between conveyer belt and rescreener, be provided with a dry type Magnetic separator, the non iron material that disperses is removed in choosing.
6, adopt iron ore of low ore grade ore-dressing technique of the present invention and preparation equipment thereof, but the contraposition product are 15% Following iron ore carries out ore dressing, and productivity ratio significantly improves, and cost particularly can exist by the contraposition product The soft iron ore of the extremely low-grade of 4-8% is processed. Compare with the existing technology and equipment of same size, Sort equal low-grade iron ore, under the condition of same power consumption, output can improve 1-2 doubly, Thereby take full advantage of this extremely low-grade iron ore deposit, have significant economic benefit and social benefit.

Claims (9)

1, a kind of iron ore of low ore grade ore-dressing technique comprises coarse crushing, fine crushing, dry separation screening, ball milling, depiler sub-material, magnetic separation, a high frequency screening, filters, and it is characterized in that comprising the steps:
1) will send into rescreener by storage bin through conveyer belt through the mineral aggregate that coarse crushing, fine crushing, a dry separation screening are sieved out and carry out regrading,
2) the rough wet type fine crushing machine of sending into that rescreener sieved out carries out the secondary fine crushing, and the fines that is sieved out is sent into the wet type coarse classifier and carried out wet type and roughly select,
3) through the mineral aggregate of secondary fine crushing through the screening of wet screening machine, the coarse fodder of telling is sent storage bin back to, the fines of telling is sent into the wet type coarse classifier and is carried out wet type and roughly select,
4) wet type is roughly selected selected fines and is sent into depiler and carry out sub-material, and the coarse fodder of being told is sent ball mill back to and carried out ball milling, and the fines of being told is sent into a magnetic separator and carried out a magnetic separation,
5) the part coarse fodder in the storage bin is also sent into ball mill and is carried out ball milling through going into the abrasive material case, and part is sent into wet type fine crushing machine and carried out the secondary fine crushing,
6) to sieving with the high frequency screening machine through the selected breeze of magnetic separator, the fines that sieves out is carried out the secondary magnetic separation by the secondary magnetic separator, and the fine iron breeze of selecting is sent into the fine iron breeze pond after filtering through filter, sends the coarse fodder of selecting back to ball mill and carries out ball milling, enter next circulation
7) dry separation is sieved a hair slag that is sieved out and is sent to a mao slag field, and the selected mine tailing of each magnetic separator is sent to the tailingspile.
2, iron ore of low ore grade ore-dressing technique according to claim 1 is characterized in that coarse fodder in the described storage bin directly sends into ball mill and carry out ball milling and partly account for 18-22%, sends into wet type fine crushing machine and carries out the secondary fine crushing and partly account for 82-78%.
3, a kind of preparation equipment that is used for the described iron ore of low ore grade ore-dressing technique of claim 1, comprise coarse crushing machine, fine crushing machine, dry separation screening machine, storage bin, ball mill, depiler, magnetic separator, high frequency sieve, filter, it is characterized in that: set up a cover wet type and roughly select unit between described storage bin and depiler, this wet type is roughly selected unit and is comprised conveyer belt, rescreener, wet type fine crushing machine, wet screening machine and the wet type coarse classifier that connects successively.
4, preparation equipment according to claim 3 is characterized in that being provided with a dry-type magnetic extractor between described conveyer belt and rescreener.
5, preparation equipment according to claim 3, it is characterized in that described wet type fine crushing machine is a hammer mill, on the charge door of this hammer mill, be provided with water inlet pipe, the charge door place is provided with the backgauge chain screen in the casing of this hammer mill, the upper end of this backgauge chain screen is fixed on the charge door of described hammer mill, the lower end is a free end, is provided with bucker on the bearing of this hammer mill.
6, preparation equipment according to claim 3, it is characterized in that described wet type coarse classifier is the wet type coarse granule iron ore strong magnetic separator that is provided with priming apparatus, above this wet type coarse granule iron ore strong magnetic separator, be provided with to the ore deposit case, be provided with striker plate for the magnetic separator support of case outlet left front, ore deposit with respect to this, this is provided with the screening batcher for the upper right side of ore deposit case.
7, preparation equipment according to claim 6 is characterized in that described screening batcher is the vibratory sieve that has eccentric vibrating device.
8, preparation equipment according to claim 7, it is characterized in that described eccentric vibrating device is by motor, the turning cylinder that is connected of motor is located at the eccentric wheel on this turning cylinder therewith, and the bearing block that this turning cylinder is connected on the vibratory sieve screen frame (unit) is formed.
9, preparation equipment according to claim 8, it is characterized in that the described motor mode that is connected with turning cylinder is: the output shaft of motor is provided with small pulley, and this small pulley is connected with big belt wheel on the turning cylinder by belt.
CNB2007101574342A 2007-10-15 2007-10-15 Mineral dressing technique for low ore grade iron ore and mineral dressing equipment thereof CN100531917C (en)

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Publication number Priority date Publication date Assignee Title
CN101413057B (en) * 2008-03-05 2011-03-30 中南大学 Method for efficiently separating low-ore grade and complicated iron ore
CN101590441B (en) * 2008-05-26 2010-11-03 鞍钢集团矿业公司 Magnetite dry-separation tailing-discarding pre-separation technology
CN101537410B (en) * 2009-04-22 2012-01-25 首钢总公司 Integrated equipment of dry concentration, rough concentration and fine concentration of waste disposal site and technique thereof
CN101966486B (en) * 2009-07-28 2012-01-04 鞍钢集团矿业公司 Magnetic separation process of fine lean hematite
CN102230071B (en) * 2010-06-01 2013-03-20 鞍钢集团矿业公司 Novel technology of low-grade magnetite two-stage pre-selecting and crushing
CN102230070B (en) * 2010-06-01 2013-03-20 鞍钢集团矿业公司 Novel three-stage pre-dressing and crushing process for low-grade magnetite
CN102925797A (en) * 2012-11-14 2013-02-13 曹艺 Iron concentrate ore sand and sieving process thereof
CN103555935A (en) * 2013-11-21 2014-02-05 中冶北方(大连)工程技术有限公司 Pellet iron ore concentrate fine grinding pelletizing system and process
CN109225605A (en) * 2018-08-28 2019-01-18 湖南柿竹园有色金属有限责任公司 A kind of method of molybdenum bismuth roughing
CN109317309A (en) * 2018-08-31 2019-02-12 福建金东矿业股份有限公司 A kind of magnetic separator and its beneficiation method

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