CN102240588B - Dry-grinding and dry-separation method of magnetite - Google Patents
Dry-grinding and dry-separation method of magnetite Download PDFInfo
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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 technique, mainly comprises fragmentation, ore grinding, magnetic separation, product treatment four-stage.Raw ore is after gyratory crusher or jaw crusher dry-type pulverizing, granularity is down to 300-350mm, again after the standard cone crusher dry-type pulverizing, granularity is down to 70-100mm, material is through vibratory sieve, and undersize material enters fine ore bin and temporarily stores, and on-the-sieve material enters short head cone crusher and carries out operation in small, broken bits, product returns to vibratory sieve with belt feeder, forms closed circuit.Undersize material in fine ore bin feeds ball mill through oscillating feeder, after the ball mill ore grinding, through the spiral classifier classification, coarse fraction returns to 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 essences are through the high frequency vibrating fine screen classification, entering three sections ball mills on sieve regrinds, returning to afterwards dusting cover forms closed circuit, enter three stages of magnetic separation under sieve and obtain concentrate, obtain concentrate and the mine tailing of Fe grade below 10% of Fe grade 65% left and right.The weak point of the method is: (1) ball mill power consumption is high, process ore per ton and on average need 15-20 degree electricity, (2) steel of ball mill consumption is higher, average treatment ore per ton need to consume steel ball and liner plate 0.8-1.5kg, (3) in producing, ball milling workshop section needs large water gaging later, average treatment 1t raw ore needs 3t water, (4) mine tailing need to enter Tailings Dam, production cost is high, the Tailings Disposal expense is high, the Safety of Tailings Dam problem is serious, current national centering small mines is no longer given an written reply the Tailings Dam construction, therefore production and the operation of centering small mines have brought larger problem.The Tailings Dam of large-scale mine expires because of the length of service and the problem such as environmental protection, also is faced with huge maintenance cost.
Summary of the invention
The object of the invention is to for magnetic iron ore production technology power consumption, steel consumption and water consumption in prior art greatly, the unmanageable deficiency of mine tailing, provide 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, comprise the steps:
A, the magnetic iron ore tcrude ore is sent into to the disintegrating machine coarse crushing, sends into bolting after fragmentation, control sieve aperture 35-75mm, oversize send into broken in disintegrating machine after, send into high-pressure roller mill and carry out in small, broken bits together with screenings;
B, by the ore after in small, broken bits in steps A through break up grader broken up with classification after, obtain the product of coarse grain, particulate, three grades of fine powder;
C, the coarse fraction product in step B is returned to 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 to 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 described steps A, tcrude ore through gyratory crusher or jaw crusher coarse crushing to 150mm-350mm.
As optimal way, in described steps A, broken in the employing gyratory crusher, gape is controlled at 20-50mm.
As optimal way, in described step B, scattering grader is controlled rotor speed 50-500r/min, rotation speed of fan 500-2000r/min, angle adjustment plate 0-40 °.
As optimal way, in 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 technique of the high steel consumption of traditional high power consumption, by 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, due to the feed preparation unit size of high-pressure roller mill, 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 Tailings Dam, 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, do not consume water, are a kind of energy-conservation, efficient, free of contamination magnetic iron ore production methods.
The accompanying drawing explanation
1, Fig. 1 is the prior art processes flow chart;
2, Fig. 2 is process chart of the present invention;
3, Fig. 3 is the present device connection layout.
In figure, be labeled as: the 1-disintegrating machine; The 2-vibratory sieve; The 3-gyratory crusher; The 4-high-pressure roller mill; The 5-elevator; The 7-scattering grader; The 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 process, except mutually exclusive feature and/or step, all can combine by any way.
Embodiment 1: as Figure 2-3, the poor magnetic iron ore in somewhere, Inner Mongol, raw ore all iron content 11.5%, Armco magnetic iron content 6.8%, be crushed to 200mm by jaw crusher, sends into vibratory sieve, sieve aperture is controlled at 45mm, on-the-sieve material is sent in gyratory crusher broken, and the gyratory crusher gape is controlled at 20mm, and undersize material is sent into high-pressure roller mill by belt together with middle crumble product.The product of high-pressure roller mill is sent into scattering grader through elevator and is processed, control rotor speed 300r/min, blower fan wind speed 1200r/min, 20 ° of angle adjustment plates, obtain+3mm coarse grain,-3+0.2mm particulate and-three other products of level of 0.2mm fine powder, the coarse grain product returns to high-pressure roller mill through elevator, the particulate product is through dry-type magnetic extractor, magnetic field intensity 1200Gs, the fine tailings of jettisoning 30% left and right, concentrate after the throwing tail returns to high-pressure roller mill by elevator and regrinds, the fine powder product passes through the dry powder magnetic separator magnetic separation, control field intensity 800Gs, obtain the concentrate of grade 58%, total Armco magnetic iron rate of recovery 98%.
Embodiment 2: as Figure 2-3, 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%, be crushed to 220mm by jaw crusher, feeds vibratory sieve, sieve aperture is controlled at 55mm, on-the-sieve material feeds in gyratory crusher broken, and the gyratory crusher gape is controlled at 30mm, and undersize material feeds high-pressure roller mill by belt together with middle crumble product.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+5mm coarse grain,-5+0.5mm particulate and-three other products of level of 0.5mm fine powder, the coarse grain product returns to high-pressure roller mill through elevator, the particulate product is through dry-type magnetic extractor, magnetic field intensity 1800Gs, the fine tailings of jettisoning 40% left and right, concentrate after the throwing tail returns to high-pressure roller mill by elevator and regrinds, the fine powder product passes through the dry powder magnetic separator magnetic separation, 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 disclosed in this manual, and the arbitrary new method disclosed or step or any new combination of process.
Claims (2)
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 to the disintegrating machine coarse crushing, sends into bolting after fragmentation, control sieve aperture 35-75mm, oversize send into broken in disintegrating machine after, send into high-pressure roller mill and carry out in small, broken bits together with screenings;
B, by the ore after in small, broken bits in steps A through break up grader broken up with classification after, obtain the product of coarse grain, particulate, three grades of fine powder, wherein scattering grader is controlled rotor speed 50-500r/min, rotation speed of fan 500-2000r/min, angle adjustment plate 0-40 °;
C, the coarse fraction product in step B is returned to 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 through belt conveyor and elevator return high-pressure roller mill regrind 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, it is characterized in that: in described step C, the fine powder mine tailing adopts bagroom to collect.
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