CN102240588A - Dry-grinding and dry-separation method of magnetite - Google Patents
Dry-grinding and dry-separation method of magnetite Download PDFInfo
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- CN102240588A CN102240588A CN2011101304072A CN201110130407A CN102240588A CN 102240588 A CN102240588 A CN 102240588A CN 2011101304072 A CN2011101304072 A CN 2011101304072A CN 201110130407 A CN201110130407 A CN 201110130407A CN 102240588 A CN102240588 A CN 102240588A
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Abstract
The invention discloses a dry-grinding and dry-separation method of magnetite, which comprises the following steps of: feeding the crude ore of magnetite into a crusher for coarse crushing, and then feeding the crushed magnetite into a vibrating sieve for sieving; controlling the sieve meshes within a range of 35-75 mm; feeding the oversize product to the crusher for intermediate crushing and then feeding the crushed oversize product into a high-pressure roller mill along with the undersize product for fine crushing; breaking and grading the fine-crushed ore by a breaking-grading machine, thereby obtaining the products of three grain grades, i.e. coarse grains, fine grains and fine powder; returning the coarse-grain grade product to the high-pressure roller mill through an elevator, and feeding the fine-grain grade product to a dry type magnetic separator for magnetic separation and discarding tailings, wherein the magnetic field intensity is controlled within a range of 1200-3000 Gs; directly dryly stacking the discarded fine-grain grade tailings, and returning the fine-grain grade concentrate to the high-pressure roller mill through a belt conveyor and the elevator to form a closed loop; and feeding the fine-powder grade product into a cyclone magnetic separator, wherein the magnetic field intensity is controlled within a range of 600-1200 Gs, thereby obtaining concentrate or semi-concentrate. The dry-grinding and dry-separation method is low in power consumption, steel consumption and water consumption, and the tailings are easy to be disposed of.
Description
Technical field
The invention belongs to the technique of preparing field, be specifically related to a kind of magnetic iron ore dry grinding dry dressing method.
Background technology
At present, the magnetite separation production technology is stage grinding-stage grading technology, mainly comprises fragmentation, ore grinding, magnetic separation, product treatment four-stage.After raw ore process gyratory crusher or the fragmentation of jaw crusher dry type, granularity is reduced to 300-350mm, after passing through the fragmentation of standard cone crusher dry type again, granularity is reduced to 70-100mm, material is through vibratory sieve, and undersize material enters fine ore bin and temporarily stores, and the oversize material enters short head cone crusher and carries out operation in small, broken bits, product returns vibratory sieve with belt feeder, forms closed circuit.Undersize material in the fine ore bin feeds ball mill through oscillating feeder, behind the ball mill ore grinding, through the spiral classifier classification, coarse fraction returns ball mill and regrinds, the fine fraction overflow enters magnetic separator and carries out magnetic concentration working, the gained concentrate feeds hydrocyclone and carries out classification, coarse fraction enters two sections ball mill ore grindings, the fine fraction overflow enters two stages of magnetic separation operations, two magnetic are smart to be entered three sections ball mills and regrinds through the high frequency vibrating fine screen classification on the sieve, return dusting cover afterwards and form closed circuit, enter three stages of magnetic separation under the sieve and obtain concentrate, obtain the concentrate and the mine tailing of Fe grade below 10% of Fe grade about 65%.The weak point of this method is: (1) ball mill power consumption height, handle ore per ton and on average need the 15-20 degree, (2) steel of ball mill consumption is higher, average treatment ore per ton need consume steel ball and liner plate 0.8-1.5kg, (3) in the production, ball milling workshop section needs big water gaging later on, average treatment 1t raw ore needs 3t water, (4) mine tailing need enter the mine tailing storehouse, the production cost height, mine tailing disposal costs height, mine tailing storehouse safety problem is serious, present national centering small mines is no longer given an written reply the construction of mine tailing storehouse, so the production of centering small mines and operation have brought bigger problem.The mine tailing storehouse of large-scale mine expires because of the length of service and problem such as environmental protection, also is faced with huge maintenance cost.
Summary of the invention
The objective of the invention is at magnetic iron ore production technology power consumption, steel consumption and water consumption in the prior art greatly, the unmanageable deficiency of mine tailing provides a kind of power consumption, steel consumption and water consumption little, the tractable magnetic iron ore dry grinding of mine tailing dry dressing method.
For achieving the above object, the technical solution adopted for the present invention to solve the technical problems is:
A kind of magnetic iron ore dry grinding dry dressing method comprises the steps:
A, the magnetic iron ore tcrude ore is sent into the disintegrating machine coarse crushing, sends into bolting after the fragmentation, control sieve aperture 35-75mm, oversize send in the disintegrating machine broken after, send into high-pressure roller mill with screenings and carry out in small, broken bits;
B, with the ore after in small, broken bits in the steps A through break up grader break up with classification after, obtain the product of coarse grain, particulate, three grades of fine powder;
C, the coarse fraction product among the step B is returned high-pressure roller mill through elevator, the fine fraction product is sent into the dry-type magnetic extractor magnetic separation and is thrown tail, magnetic field intensity is controlled at 1200Gs-3000Gs, throw the fine tailings of tail and directly do heap, fine concentrate process belt conveyor and elevator return high-pressure roller mill and form closed circuit, fine powder level product is sent into the whirlwind magnetic separator, and controlling magnetic field intensity 600Gs-1200Gs obtains concentrate or half concentrate.
As optimal way, in the described steps A, tcrude ore through gyratory crusher or jaw crusher coarse crushing to 150mm-350mm.
As optimal way, in the described steps A, broken in the employing gyratory crusher, gape is controlled at 20-50mm.
As optimal way, among the described step B, scattering and grading machine control rotor speed 50-500r/min, rotation speed of fan 500-2000r/min, angle adjustment plate 0-40 °.
As optimal way, among the described step C, the fine powder mine tailing adopts bagroom to collect.
The inventive method adopts high-pressure roller mill, dry type air classification and dry type magnetic separation to replace the ball mill technology of the high steel consumption of traditional high power consumption, with material from-60mm, the choosing of broken limit, limit to-0.5mm even-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 at about 60mm, so crushing circuit is simplified greatly; The dry type mine tailing that production obtains can be used as building sand, need not build the mine tailing storehouse, has saved substantial contribution, has saved land resource.
Beneficial effect of the present invention is:
Flow process of the present invention is short, and production cost is low, and floor space is little, and just consumption, power consumption are little, and consume water is not a kind of energy-conservation, efficient, free of contamination magnetic iron ore production method.
Description of drawings
1, Fig. 1 is the prior art processes flow chart;
2, Fig. 2 is a process chart of the present invention;
3, Fig. 3 is the present device connection layout.
Be labeled as among the figure: the 1-disintegrating machine; The 2-vibratory sieve; The 3-gyratory crusher; The 4-high-pressure roller mill; The 5-elevator; 7-scattering and grading machine; 8-dry powder magnetic separator; The 9-bagroom; The 10-dry-type magnetic extractor.
The specific embodiment
Disclosed all features in this specification, or the step in disclosed all methods or the process except mutually exclusive feature and/or step, all can make up by any way.
Embodiment 1: shown in Fig. 2-3, the poor magnetic iron ore in somewhere, Inner Mongol, raw ore all iron content 11.5%, Armco magnetic iron content 6.8% is crushed to 200mm by jaw crusher, sends into vibratory sieve, sieve aperture is controlled at 45mm, the oversize material is sent in the gyratory crusher broken, and the gyratory crusher gape is controlled at 20mm, and undersize material and middle crumble product are sent into high-pressure roller mill by belt together.The product of high-pressure roller mill is sent into the scattering and grading machine through elevator and is handled, control rotor speed 300r/min, blower fan wind speed 1200r/min, 20 ° of angle adjustment plates, obtain+the 3mm coarse grain,-3+0.2mm particulate and-three other products of level of 0.2mm fine powder, the coarse grain product returns high-pressure roller mill through elevator, and the particulate product is through dry-type magnetic extractor, magnetic field intensity 1200Gs, the fine tailings of jettisoning about 30%, concentrate behind the throwing tail returns high-pressure roller mill by elevator and regrinds, and the fine powder product then passes through the magnetic separation of dry powder magnetic separator, control field intensity 800Gs, obtain the concentrate of grade 58%, total Armco magnetic iron rate of recovery 98%.
Embodiment 2: shown in Fig. 2-3, the poor magnetic iron ore in somewhere, Xinjiang, raw ore all iron content 18.6%, Armco magnetic iron content 15.3% is crushed to 220mm by jaw crusher, feeds vibratory sieve, sieve aperture is controlled at 55mm, the oversize material feeds in the gyratory crusher broken, and the gyratory crusher gape is controlled at 30mm, and undersize material and middle crumble product feed high-pressure roller mill by belt together.The product of high-pressure roller mill feeds elevator, after breaing up the grader processing, control rotor speed 350r/min, blower fan wind speed 1500r/min, 15 ° of angle adjustment plates, obtain+the 5mm coarse grain ,-5+0.5mm particulate and-three other products of level of 0.5mm fine powder, the coarse grain product returns high-pressure roller mill through elevator, the particulate product is through dry-type magnetic extractor, magnetic field intensity 1800Gs, the fine tailings of jettisoning about 40%, the concentrate behind the throwing tail returns high-pressure roller mill by elevator and regrinds, the fine powder product then passes through the magnetic separation of dry powder magnetic separator, control field intensity 600Gs, obtain the concentrate of grade 62%, total Armco magnetic iron rate of recovery 97%.
The present invention is not limited to the aforesaid specific embodiment.The present invention expands to any new feature or any new combination that discloses in this manual, and the arbitrary new method that discloses or step or any new combination of process.
Claims (5)
1. a magnetic iron ore dry grinding dry dressing method is characterized in that comprising the steps:
A, the magnetic iron ore tcrude ore is sent into the disintegrating machine coarse crushing, sends into bolting after the fragmentation, control sieve aperture 35-75mm, oversize send in the disintegrating machine broken after, send into high-pressure roller mill with screenings and carry out in small, broken bits;
B, with the ore after in small, broken bits in the steps A through break up grader break up with classification after, obtain the product of coarse grain, particulate, three grades of fine powder;
C, the coarse fraction product among the step B is returned high-pressure roller mill through elevator, the fine fraction product is sent into the dry-type magnetic extractor magnetic separation and is thrown tail, magnetic field intensity is controlled at 1200Gs-3000Gs, throw the fine tailings of tail and directly do heap, fine concentrate process belt conveyor and elevator return high-pressure roller mill and form closed circuit, fine powder level product is sent into the whirlwind magnetic separator, and controlling magnetic field intensity 600Gs-1200Gs obtains concentrate or half concentrate.
2. a kind of magnetic iron ore dry grinding dry dressing method as claimed in claim 1 is characterized in that: in the described steps A, tcrude ore through gyratory crusher or jaw crusher coarse crushing to 150mm-350mm.
3. a kind of magnetic iron ore dry grinding dry dressing method as claimed in claim 1, it is characterized in that: in the described steps A, broken in the employing gyratory crusher, gape is controlled at 20-50mm.
4. a kind of magnetic iron ore dry grinding dry dressing method as claimed in claim 1 is characterized in that: among the described step B, and scattering and grading machine control rotor speed 50-500r/min, rotation speed of fan 500-2000r/min, angle adjustment plate 0-40 °.
5. a kind of magnetic iron ore dry grinding dry dressing method as claimed in claim 1, it is characterized in that: among the described step C, the fine powder mine tailing adopts bagroom to collect.
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| CN102489397A (en) * | 2011-12-20 | 2012-06-13 | 鞍钢集团矿业公司 | Dry dry crushing, grinding, grading and four-stage magnetic separation process of magnetite |
| CN102500455A (en) * | 2011-12-21 | 2012-06-20 | 湖北工业大学 | Tailing efficient recovery treatment method |
| CN102600923A (en) * | 2012-03-12 | 2012-07-25 | 成都利君实业股份有限公司 | Magnetite finish grinding system and grinding method thereof |
| CN102814227A (en) * | 2012-08-23 | 2012-12-12 | 成都利君科技有限责任公司 | Floating selection method of nonferrous metal mineral powder |
| CN102921639A (en) * | 2012-11-16 | 2013-02-13 | 鞍钢集团矿业公司 | Sectionalized dry separation process for magnetic minerals |
| CN103639027A (en) * | 2013-12-06 | 2014-03-19 | 中信大锰矿业有限责任公司大新锰矿分公司 | Dry separation method of manganese carbonate ore |
| CN103736663A (en) * | 2014-01-23 | 2014-04-23 | 陕西三沅重工发展股份有限公司 | Magnetite beneficiation method |
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| CN102489397B (en) * | 2011-12-20 | 2013-08-07 | 鞍钢集团矿业公司 | Dry crushing, grinding, grading and four-stage magnetic separation process of magnetite |
| CN102489397A (en) * | 2011-12-20 | 2012-06-13 | 鞍钢集团矿业公司 | Dry dry crushing, grinding, grading and four-stage magnetic separation process of magnetite |
| CN102500455A (en) * | 2011-12-21 | 2012-06-20 | 湖北工业大学 | Tailing efficient recovery treatment method |
| CN102600923A (en) * | 2012-03-12 | 2012-07-25 | 成都利君实业股份有限公司 | Magnetite finish grinding system and grinding method thereof |
| CN102600923B (en) * | 2012-03-12 | 2014-05-14 | 成都利君实业股份有限公司 | Magnetite finish grinding system and grinding method thereof |
| CN102814227A (en) * | 2012-08-23 | 2012-12-12 | 成都利君科技有限责任公司 | Floating selection method of nonferrous metal mineral powder |
| CN102921639A (en) * | 2012-11-16 | 2013-02-13 | 鞍钢集团矿业公司 | Sectionalized dry separation process for magnetic minerals |
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